| 单词 | silica |
| 例句 | The scabs look like rocks, bumpy, with a sheen like silica; or else like some kind of fungus. Cat's Eye 1988-09-01T00:00:00Z It houses a rough-hewn gallery displaying extraordinarily delicate glassware made on-site using silica mined up the road, in Spruce Pine. This tiny North Carolina town is an Asheville alternative for the crowd-weary 2016-09-01T04:00:00Z Fountains of silica dust drift skyward, accumulating as a scummy layer on a local schoolhouse. 'The Last Mountain': Blasting the practice of 'mountaintop removal' coal mining 2011-07-14T19:30:06Z Crystalline silica is a known carcinogen and the cause of silicosis, an irreversible, incurable disease. Farmers? sand-frac nightmare 2012-05-21T16:31:00Z The health monitoring cat litter subscription service utilizes silica gel crystals that change color if a feline illness is detected. 10 pet gifts that are perfect for the holidays 2021-12-08T05:00:00Z Now crushed stones and colored porcelain mix with the brand’s hallmark BBs, sand, and sparkly black silica, creating layers of color and texture that look something like Sweet Tarts merged with rock candy. Dazzle Your Garden with Sparkling Furnishings by Fernando Mastrangelo 2015-07-02T04:00:00Z These layers of manganese, arsenic and silica are known as desert varnish and they are found in the Atacama desert in Chile, the Mojave desert in California, and in many other arid places. Life on Earth… but not as we know it 2013-04-13T23:05:01Z Boxes, bins and cake pans hold dogwood, roses and peonies buried in silica gel. Save summer by preserving flowers 2014-08-06T04:00:00Z We took a slow, 1½-hour hike through the steaming rivers, silica terraces, lakes and hillsides, savoring the weird and wild beauty. This region on New Zealand’s North Island is the Southern Hemisphere’s take on Yellowstone 2018-02-08T05:00:00Z The petition relies on studies, including one by the DNR itself, which acknowledge the risk of airborne silica from frac-sand mines for those who live nearby. Farmers? sand-frac nightmare 2012-05-21T16:31:00Z Like the glass in soda bottles, the glass in your vase consists mostly of white silica sand. How to remove haze from a crystal vase 2021-09-19T04:00:00Z OSHA’s most recent regulatory dust-up is over the proposed silica standard. NH post office cuts hours 2012-06-25T15:30:00Z The petitioners asked the agency to declare respirable crystalline silica a hazardous substance and to monitor it, using a public health protection level set by California’s Office of Environmental Health Hazard Assessment. Farmers? sand-frac nightmare 2012-05-21T16:31:00Z And grinding releases silica dust, which causes permanent lung damage if inhaled. How to raise a sunken sidewalk block and restore a level walkway 2019-09-01T04:00:00Z Dear Readers: Here are some additional uses for those silica gel packets: Perspective | Hints From Heloise: Texas snowstorm revealed warmhearted neighbors 2021-03-04T05:00:00Z The displays will reflect the women’s strong interest in inventive materials, like the furniture of AMMA, a studio that works with sand, coffee, silica, pink Himalayan salt, cement and BB pellets. Currents: Events: New Fairs Add to Design Mix 2014-05-07T22:58:20Z Higher intakes of silica, a mineral found in quartz, is linked to higher bone density. Perspective | Is alkaline water really better for you? 2019-08-27T04:00:00Z It contains something called Youth Boosting Technology, a concoction of ceramide 3, hyaluronic acid, microspheres of magnesium silicate, and silica, among other plant and nutritional supplements. Skin Deep: Promises From the Powder Room 2013-05-06T20:52:57Z Because one of the key ingredients of toothpaste is silica – "posh sand", as Jane calls it. TV review: Wonderstuff; How Murdoch Ran Britain: Dispatches 2011-07-25T20:10:00Z Another display, using jawbone models, shows why animals in the hydrothermal areas of the park tend to live shorter lives: silica deposits on vegetation prematurely wear away their teeth. A Shrine That It Seems to Tame Old Faithful 2010-08-30T17:28:00Z Airborne silica dust is classified as a carcinogen and can cause silicosis, a serious and sometimes fatal lung disease. How to restore Fireslate countertops There are plenty of silica mines sited close to communities. Farmers? sand-frac nightmare 2012-05-21T16:31:00Z That sandstone contains a particularly pure form of crystalline silica. Farmers? sand-frac nightmare 2012-05-21T16:31:00Z Mr. Godla opened a base panel to reveal containers for silica gels, misters and buffering salts. Antiques: Patent Models, Roger Broders Posters, Meissen Porcelain 2011-12-08T22:10:53Z A rectilinear side table is composed of a spare cement shell with a luminous silica lining. AMMA Studio Makes Beautiful Furniture from Unconventional Materials 2014-08-20T04:00:00Z An amorphous composite of watery silica spheres, it lacks the crystalline quality that allows most stones to be faceted. Special Report: Jewelry: Opal: Delicate Beauty in a Watery Orb 2010-05-20T16:00:00Z Not only did the land contain the coveted crystalline silica; it was close to a rail spur. Farmers? sand-frac nightmare 2012-05-21T16:31:00Z Burning off, the salt formed sodium vapor, which reacted with the silica in the clay to make a pebbled brownish glaze. Don Reitz, Who Made Dirt and Salt Into Art, Dies at 84 2014-03-30T00:25:15Z Fireslate, which resembles slate, is made from Portland cement, silica sand, water and fillers. How to restore Fireslate countertops The fate of the silica standard is a neat encapsulation of OSHA’s existential crisis. NH post office cuts hours 2012-06-25T15:30:00Z "The piezoelectric material we used is a form of quartz, which is nothing more than a mineral composed of silica," Prasad said. Putting sound waves to work to create safer public spaces 2023-11-14T05:00:00Z Illustration of silica crystals coming out from the liquid metal of the Earth's outer core due to a water-induced chemical reaction. Earth's surface water dives deep, transforming core's outer layer 2023-11-13T05:00:00Z Researchers have made their own silica gel, а staple in chromatography machines, which separate chemical compounds from mixtures. Scientists in Russia struggle in a world transformed by its war with Ukraine 2023-11-09T05:00:00Z A laboratory test of the powder he brought back alongside lung tissue from his biopsy showed that both contained silica dust, a carcinogen associated with scarring of the lungs. Facing a labor crisis, South Korea turns to migrants. Why are they more likely to die on the job? 2023-10-30T04:00:00Z Although it is chemically still silica, the crystal lattices are more tightly packed and therefore denser. Alpine rock reveals dynamics of plate movements in Earth's interior 2023-10-27T04:00:00Z Quartz is a form of silicate, which are minerals rich in silica and oxygen. JWST Detects Quartz Crystals in an Exoplanet’s Atmosphere 2023-10-20T04:00:00Z Additionally, the reaction generates silica crystals that rise and integrate into the mantle. Earth's surface water dives deep, transforming core's outer layer 2023-11-13T05:00:00Z The samples are forced through a column of silica gel, which traps the unwanted chemicals and leaves the alkanes they want to measure. Paleoclimatologists use ancient sediment to explore future climate in Africa 2023-10-10T04:00:00Z Engineered stone is a manufactured composite material made up of crushed stone that contains more than 90% silica, according to the California Department of Industrial Relations. Engineered stone counter tops are killing workers at high rates. What can consumers do about it? 2023-09-29T04:00:00Z The other silica polymorph was quartz, which lay like a ring around the coesite. Alpine rock reveals dynamics of plate movements in Earth's interior 2023-10-27T04:00:00Z The lack of moisture would also diminish the amount of silica that is washed into the oceans, which usually removes CO2 from the atmosphere. Pangaea Ultima, the Next Supercontinent, May Doom Mammals to Far-Future Extinction 2023-09-27T04:00:00Z At the interface where subducting water meets the core, a chemical exchange occurs to form a hydrogen-rich layer in the topmost outer core and dense silica in the bottom of the mantle. Earth's surface water dives deep, transforming core's outer layer 2023-11-13T05:00:00Z For this, the team used individual silicon dioxide particles, known as silica, and grafted chain-like polymer molecules as a sort of shell. Crystallization as the driving force 2023-09-25T04:00:00Z If the counter tops are cut or sanded in the home, the consumer can be exposed to a small amount of silica but the workers face the most serious health problems, Gandhi said. Engineered stone counter tops are killing workers at high rates. What can consumers do about it? 2023-09-29T04:00:00Z Silicosis can ravage the lungs of workers after they inhale tiny particles of crystalline silica while they cut and grind stone that contains the mineral. California workers who cut countertops are dying of an incurable disease 2023-09-24T04:00:00Z They could see that the patina possessed a hierarchical structure made up of highly regular, micrometer-thick silica layers of alternating high and low density which resembled reflectors known as Bragg stacks. Buried ancient Roman glass formed substance with modern applications 2023-09-18T04:00:00Z "Obviously, we will fully believe it when the last piece of equipment and every last grain of silica sand has been removed, but we think this really means there are no more excuses," she said. Cuadrilla: Fracking firm given new deadline to plug wells 2023-08-11T04:00:00Z Silicosis, commonly referred to as black lung, is an occupational pneumoconiosis caused by the inhalation of crystalline silica dust present in minerals like sandstone. Coal miners plead with feds for stronger enforcement during emotional hearing on black lung rule 2023-08-10T04:00:00Z However, the man-made stone contains silica, more than other stones. California moves to protect countertop makers from lung disease 2023-07-25T04:00:00Z One question before the county — and government regulators across the globe — is whether any safeguards will effectively protect workers grinding materials so high in silica. California workers who cut countertops are dying of an incurable disease 2023-09-24T04:00:00Z Now the federal Mine Safety and Health Administration has proposed a rule that would cut the current limit for silica exposure by half - a major victory for safety advocates. After decades of delays and broken promises, coal miners hail rule to slow rise of black lung 2023-07-24T04:00:00Z The problem has only grown in recent years as miners dig through more layers of rock to get to less accessible coal, generating deadly silica dust in the process. After decades of delays and broken promises, coal miners hail rule to slow rise of black lung 2023-07-23T04:00:00Z Attorney Sam Petsonk, who has represented coal miners who were diagnosed with black lung after companies violated safety violations, said a silica rule is long overdue. Coal miners plead with feds for stronger enforcement during emotional hearing on black lung rule 2023-08-10T04:00:00Z If workers inhale enough silica dust when cutting countertops, they can develop silicosis. California moves to protect countertop makers from lung disease 2023-07-25T04:00:00Z County is exploring whether to go further and ban the sale and installation of “silica engineered stone” entirely. California workers who cut countertops are dying of an incurable disease 2023-09-24T04:00:00Z The federal mine safety agency’s existing silica standards were developed in the 1970s, around the time of the U.S. After decades of delays and broken promises, coal miners hail rule to slow rise of black lung 2023-07-24T04:00:00Z Now the federal Mine Safety and Health Administration has proposed a rule that would cut the current limit for silica exposure in half — a major victory for safety advocates. After decades of delays and broken promises, coal miners hail rule to slow rise of black lung 2023-07-23T04:00:00Z But he is concerned that the rule requires no routine sampling and contains no specific monetary penalties for exceeding silica dust limits. Coal miners plead with feds for stronger enforcement during emotional hearing on black lung rule 2023-08-10T04:00:00Z The damage done to workers’ lungs from exposure to silica is often irreversible, leading to lung transplants and death. California moves to protect countertop makers from lung disease 2023-07-25T04:00:00Z Mr. Gilmour learned of an underground aquifer beneath the volcanic highlands of the Fijian island of Viti Levu with water rich in the mineral silica. David Gilmour, Who Brought Fiji’s Water to the Masses, Dies at 91 2023-06-30T04:00:00Z The plumes seen by Cassini contained silica particles that were probably carried up from the sea floor by churning fluids. JWST Spots Biggest Water Plume Yet Spewing from a Moon of Saturn 2023-05-23T04:00:00Z Silicosis is an occupational pneumoconiosis caused by the inhalation of crystalline silica dust present in minerals like sandstone. After decades of delays and broken promises, coal miners hail rule to slow rise of black lung 2023-07-23T04:00:00Z Sclerocytes within this layer produce silica spicules that extend outside the body of the sponge. Fundamentals of Biology 2015-01-01T00:00:00Z California alone has recorded at least 77 workers who have been sickened by silica dust. California moves to protect countertop makers from lung disease 2023-07-25T04:00:00Z "Repeated breaches were found including a lack of sufficient welfare, unsuitable controls for work at height and inadequate protection from silica dust exposure," inspectors said. Firm fined £120k after builders lifted in digger's bucket 2023-01-30T05:00:00Z Both of Trumka’s grandfathers were miners from southwestern Pennsylvania, and both men died of black-lung disease, which is caused by inhaling toxic coal and silica dust in underground mines. Meet the man who unwittingly triggered the war over gas stoves 2023-01-26T05:00:00Z Department of Labor began studying silica and its impact on workers’ health in the 1930s, but the focus on stopping exposure in the workplace largely bypassed coal miners. After decades of delays and broken promises, coal miners hail rule to slow rise of black lung 2023-07-23T04:00:00Z In some sponges, sclerocytes secrete small spicules into the mesohyl, which are composed of either calcium carbonate or silica, depending on the type of sponge. Fundamentals of Biology 2015-01-01T00:00:00Z The effects of silica exposure can be limited with protective equipment, wet cutting and increased ventilation. California moves to protect countertop makers from lung disease 2023-07-25T04:00:00Z It’s rich in both aluminum and silica and can withstand decades of high temperatures inside the firebox. How to safely deal with a masonry fireplace (and avoid smoke) 2023-01-16T05:00:00Z It uses silica from rice husk waste residue for grip and fuel efficiency. CES 2023: Companies tout environmental tech innovations 2023-01-09T05:00:00Z MSHA’s existing silica standards were developed in the 1970s, around the time of the U.S. After decades of delays and broken promises, coal miners hail rule to slow rise of black lung 2023-07-23T04:00:00Z Once I zoomed into the photo, I could clearly see what appears to be tiny grains of milky silica sand. Cleaning shower grout requires the right tool 2022-12-05T05:00:00Z Current federal regulations have provisions to prevent silica exposure, but California officials found in 2020 that more than 70% of countertop manufacturers were out of step with those regulations, putting hundreds of workers at risk. California moves to protect countertop makers from lung disease 2023-07-25T04:00:00Z The base is mostly silica, with a few “fluxes,” or substances that lower the melting point of the silica, she adds. Uranium glass collectibles glow. But don’t worry, they’re not toxic. 2022-10-11T04:00:00Z Fossils such as this opalized ammonite can develop gradually when a mixture of water and silica permeates deeply buried shells, bones or teeth left behind after other remains rot away. New Classification Reveals Just How Many Ways Minerals Form 2022-09-05T04:00:00Z The proposed rule also includes a provision that allows companies to self-report silica levels. After decades of delays and broken promises, coal miners hail rule to slow rise of black lung 2023-07-23T04:00:00Z The silica sand makes the grout strong and very durable. Cleaning shower grout requires the right tool 2022-12-05T05:00:00Z Molten slag forms as the iron and silica are removed by Lewis acid-base reactions: Chemistry 2019-02-14T00:00:00Z Dour said the new surface contains silica for better traction, and will contain grooves known as tining, to reduce water buildup. A look inside the West Seattle Bridge reveals ‘banjo tight’ repairs 2022-08-10T04:00:00Z Yes, I did forget to remove the silica gel packet from the new and improved case. Sennheiser Momentum 4 headphones review: less cool, more comfortable 2022-08-08T04:00:00Z The producer of commercial silica posted quarterly earnings that exceeded analysts’ estimates and touted robust demand. Amazon, Chevron rise; Roku, Intel fall 2022-07-29T04:00:00Z The outer layer consists of woven silica that is laminated, or bonded, to aluminum foil. How to Make Sure Wildfire Shelters Save Firefighters’ Lives 2022-07-25T04:00:00Z Silicon dioxide, silica, occurs in both crystalline and amorphous forms. Chemistry 2019-02-14T00:00:00Z Earlier this year, he stood next to a low cliff of silica that runs north to south along the top of a small hill. In Utah, researchers are trying to unlock Earth’s heat and make geothermal energy a reality 2022-07-13T04:00:00Z Terrigenous clays are distributed across the sea floor, but in areas where either carbonate- or silica-forming organisms thrive, the sediments are likely to be dominated by carbonate or silica oozes. Physical Geology 2015-01-01T00:00:00Z Feldspars are mostly silica with aluminum, potassium, sodium, and calcium. An Introduction to Geology 2017-01-01T00:00:00Z He also noted that coal ash has a large concentration of silica. Coal ash workers’ case heard by Tennessee Supreme Court 2022-06-01T04:00:00Z The term quartz is also used for articles such as tubing and lenses that are manufactured from amorphous silica. Chemistry 2019-02-14T00:00:00Z At Moore’s feet sat opal gemstones formed about 1600 years ago when hot springs saturated with silica spilled to the surface, leaving behind rocks candy-striped in yellow, red, and white. In Utah, researchers are trying to unlock Earth’s heat and make geothermal energy a reality 2022-07-13T04:00:00Z Although clay is widely dispersed in the oceans, in some areas, deep-sea sediments are dominated by clay, while in others they are dominated by carbonate or silica ooze. Physical Geology 2015-01-01T00:00:00Z These groups refer to differing amounts of silica, iron, and magnesium found in the minerals that make up the rocks. An Introduction to Geology 2017-01-01T00:00:00Z The worker’s attorneys argue the silica law was never meant to apply to cases like theirs. Coal ash workers’ case heard by Tennessee Supreme Court 2022-06-01T04:00:00Z When the liquid cools, it does not crystallize readily but usually supercools and forms a glass, also called silica. Chemistry 2019-02-14T00:00:00Z The law requires anyone pursuing claims for exposure to silica or mixed dust to file a doctor’s report concluding that the exposure is a “substantial contributing factor” to the patient’s illness. Coal ash workers dying as lawsuit over illnesses drags on 2022-05-30T04:00:00Z In fact, clay settles everywhere in the oceans, but in areas where silica- and carbonate-producing organisms are prolific, they produce enough silica or carbonate sediment to dominate over clay. Physical Geology 2015-01-01T00:00:00Z The percentage of silica is shown on the horizontal axis. An Introduction to Geology 2017-01-01T00:00:00Z Oral arguments centered on Jacobs Engineering’s contention that the workers’ claims should fall under a Tennessee law that limits legal challenges involving exposure to silica, a component of coal ash. Coal ash workers’ case heard by Tennessee Supreme Court 2022-06-01T04:00:00Z The coefficient of expansion of silica glass is very low; therefore, rapid temperature changes do not cause it to fracture. Chemistry 2019-02-14T00:00:00Z Attorneys for the workers argue the silica law was never meant to apply to cases like theirs. Coal ash workers dying as lawsuit over illnesses drags on 2022-05-30T04:00:00Z The bonds in a silica tetrahedron have some of the properties of covalent bonds and some of the properties of ionic bonds. Physical Geology 2015-01-01T00:00:00Z These light- colored minerals have more silica as a proportion of their overall chemical formula. An Introduction to Geology 2017-01-01T00:00:00Z Justice Kirby Holly said the court has to consider how the interpretation would apply otherwise, noting further that breakfast cereal and the pain reliever Motrin contain silica. Coal ash workers’ case heard by Tennessee Supreme Court 2022-06-01T04:00:00Z Opal is a naturally occurring form of amorphous silica. Chemistry 2019-02-14T00:00:00Z The act specifically refers to silica, which is just one component of coal ash. Coal ash workers dying as lawsuit over illnesses drags on 2022-05-30T04:00:00Z In amphibole structures, the silica tetrahedra are linked in a double chain that has an oxygen-to- silicon ratio lower than that of pyroxene, and hence still fewer cations are necessary to balance the charge. Physical Geology 2015-01-01T00:00:00Z It is mostly made of dark minerals like pyroxene and olivine, which are rich in iron and magnesium and relatively poor in silica. An Introduction to Geology 2017-01-01T00:00:00Z Roughly 25,000 coal miners suffer from black lung, which is caused by inhaling toxic coal and silica dust in underground mines. In West Virginia, the clean-energy transition rests on Joe Manchin 2022-05-18T04:00:00Z The SiO4 tetrahedra in glassy silica have a random arrangement characteristic of supercooled liquids, and the glass has some very useful properties. Chemistry 2019-02-14T00:00:00Z The components they believe caused the worker injuries include arsenic, lead, cadmium, mercury and radium, but not silica. Coal ash workers dying as lawsuit over illnesses drags on 2022-05-30T04:00:00Z How are the silica tetrahedra structured differently in pyroxene and amphibole? Physical Geology 2015-01-01T00:00:00Z Ultramafic refers to the extremely mafic rocks composed of mostly olivine and some pyroxene which have even more magnesium and iron and even less silica. An Introduction to Geology 2017-01-01T00:00:00Z You can minimize the slippery surface of painted concrete by applying pure silica sand into the paint immediately after you’ve coated the concrete with it. Enliven drab concrete, but not with paint 2022-04-06T04:00:00Z Last June, the Department of Homeland Security cracked down on goods made with silica tied to human rights abuses in China’s Xinjiang Uyghur Autonomous Region. Renewable energy growth in the US lags far behind Biden’s climate ambitions 2022-02-16T05:00:00Z Condensation streamed down the sides, so Ridgway put a blotter under the lid, then sealed the entire box into a plastic bag along with sacks of silica gel to absorb moisture. Confederate pride and the Chamber of Commerce: Richmond’s Lee statue finally gives up its time capsule secrets 2021-12-28T05:00:00Z Again, the more silica-rich parts of the surrounding rock are preferentially melted, and this contributes to an increase in the silica content of the magma. Physical Geology 2015-01-01T00:00:00Z It is poor in silica, in the 40% or less range. An Introduction to Geology 2017-01-01T00:00:00Z On Thursday, chipmaker Intel Corp. apologized for asking suppliers to avoid sourcing goods from Xinjiang, a major source of silica used in processor chips. China denounces US law on Xinjiang imports 2021-12-24T05:00:00Z Xinjiang is a major supplier of silica used in making computer chips. Intel Corp. apologizes for asking suppliers to avoid Xinjiang 2021-12-23T05:00:00Z Conservators whisked them away to dunk into silica gel to halt the oxidation process. Confederate pride and the Chamber of Commerce: Richmond’s Lee statue finally gives up its time capsule secrets 2021-12-28T05:00:00Z The composition of the original magma is critical to magma crystallization because it determines how far the reaction process can continue before all of the silica is used up. Physical Geology 2015-01-01T00:00:00Z Felsic lavas have lower temperatures and more silica and thus are higher viscosity. An Introduction to Geology 2017-01-01T00:00:00Z One such ink contained hyaluronic acid, a seaweed extract and fumed silica — all agents that made the material thicker and more viscous. This Ink Is Alive and Made Entirely of Microbes 2021-11-23T05:00:00Z A sachet of silica gel warrants a “do not eat” label, while the seasoning packet that comes with instant ramen requires no endorsement. Perspective | Surgeons sometimes operate on the wrong body part. There's an easy fix. 2021-11-19T05:00:00Z Many of the paper items will be frozen and then slowly dried out using silica gel and blotters. Confederate pride and the Chamber of Commerce: Richmond’s Lee statue finally gives up its time capsule secrets 2021-12-28T05:00:00Z As a mafic magma starts to cool, some of the silica combines with iron and magnesium to make olivine. Physical Geology 2015-01-01T00:00:00Z The dissolved substances may later precipitate into chemical sedimentary rocks like evaporite and limestone, as well as amorphous silica or chert nodules. An Introduction to Geology 2017-01-01T00:00:00Z Additionally, the fluid was carbon-rich in the oldest diamonds, heavy in silica in the next oldest, and saline-rich in the youngest. Ugly Diamonds Hold a Billion-Plus Years of Earth History 2021-08-17T04:00:00Z These brown-green algae cells are encased in a silica shell — giving diatoms a spangled, jewel-like appearance under the microscope. Years after the devastating ‘Blob,’ ocean conditions appear to be improving, plankton survey shows 2021-06-14T04:00:00Z Once a swamp that had been blanketed in volcanic ash, the rock from the coal mine was full of fossils preserved when silica from the ash infiltrated the plants’ cells. Exquisite fossils unearthed in Inner Mongolia reveal how peas got their hard coat 2021-05-26T04:00:00Z As it cools further, much of the remaining silica goes into calcium-rich plagioclase, and any silica left may be used to convert some of the olivine to pyroxene. Physical Geology 2015-01-01T00:00:00Z The components include aragonite, a mineral similar to and commonly replaced by calcite, and silica. An Introduction to Geology 2017-01-01T00:00:00Z Floor tiles must be installed in thinset, which is a mix of fine silica sand and Portland cement. How to successfully DIY a mosaic tile floor 2021-05-21T04:00:00Z Sartbaeva, whose previous research focused on the structure of porous silicate materials, thought silica might be able to create a protective molecular cage around the vaccine’s proteins, preventing them from unfolding in the heat. Here’s how scientists are designing vaccines that can ditch the fridge 2021-04-21T04:00:00Z The researchers again started with tiny silica particles. Glass molded like plastic could usher in new era of complex shapes 2021-04-08T04:00:00Z As cooling continues, the various reactions on the discontinuous branch will proceed because silica is abundant, the plagioclase will become increasingly sodium-rich, and eventually potassium feldspar and quartz will form. Physical Geology 2015-01-01T00:00:00Z Water deep underground is subjected to higher pressures and temperatures, which helps dissolve silica into an aqueous solution. An Introduction to Geology 2017-01-01T00:00:00Z Except now rather than a magical spring, we reach for water containing products such as roses, crystals and exotic fruits alongside the less whimsical-sounding collagen, amino acid, silica and selenium. 'Hydration is a simple thing': has the quest to improve water actually worked? 2021-03-09T05:00:00Z Over the next few years, Sartbaeva and colleagues developed a process in which reactive silica molecules are mixed with the proteins. Here’s how scientists are designing vaccines that can ditch the fridge 2021-04-21T04:00:00Z Outside of the mold, the parts hold their shape because myriad weak attractive bonds, called van der Waals interactions, form between neighboring silica particles. Glass molded like plastic could usher in new era of complex shapes 2021-04-08T04:00:00Z BIF forms when iron dissolved in seawater is oxidized, becomes insoluble, and sinks to the bottom in the same way that silica tests do to form chert. Physical Geology 2015-01-01T00:00:00Z As the groundwater rises toward or emerges at the surface the silica precipitates out, often as a cementing agent or into nodules. An Introduction to Geology 2017-01-01T00:00:00Z That ginseng improves energy, say, or that ginger alleviates nausea, or that horsetail, which contains silica, might help hair to grow? Revisiting an Ancient Theory of Herbalism 2020-11-12T05:00:00Z “The cool thing about silica is that it’s quite malleable,” allowing for a perfect fit, Sartbaeva says. Here’s how scientists are designing vaccines that can ditch the fridge 2021-04-21T04:00:00Z Dr. Daniels said that the softest granular material she had ever touched was a substance called Q-Cell, a silica powder used for filling dents in surfboards. What Makes Sand Soft? 2020-11-09T05:00:00Z A silicate mineral is one in which silicon and oxygen are present as silica tetrahedra. Physical Geology 2015-01-01T00:00:00Z The silica is dissolved in water that is thermally heated by a relatively deep magma source. An Introduction to Geology 2017-01-01T00:00:00Z Until recently, the University of Washington spinoff with a staff of 14 has specialized in flexible, silica gel membranes used in water treatment and purification. Seattle company says its spray treatment could make cloth masks more effective against COVID-19 2020-10-26T04:00:00Z Her group’s silica cages stabilized diphtheria and tetanus proteins for at least 1 month at room temperature and 2 hours at 80ºC, she and her colleagues reported last year in Nature Scientific Reports. Here’s how scientists are designing vaccines that can ditch the fridge 2021-04-21T04:00:00Z The powder is made of hollow grains, so it feels extremely light, and the silica material stays dry, which keeps it from clumping. What Makes Sand Soft? 2020-11-09T05:00:00Z The mineral quartz is made up entirely of silica tetrahedra, and some forms of quartz are known as silica. Physical Geology 2015-01-01T00:00:00Z Gold was introduced by hydrothermal fluids which reacted with silty calcareous rocks, removing carbonate, creating additional permeability, and adding silica and gold-bearing pyrite in the pore space between grains. An Introduction to Geology 2017-01-01T00:00:00Z The beads are 35 micrometres in diameter and made from silica; a compound made up of oxygen and silicon, which is supposed to reflect 90% of the sun’s heat. 10 million snowblowers? Last-ditch ideas to save the Arctic ice 2020-10-20T04:00:00Z In addition to visual impacts, the crystalline silica released when rock is pulverized poses a serious threat to human health when inhaled. Cherry farmers pitted against gravel quarries over dust 2020-10-11T04:00:00Z Indeed, opals are naturally formed, fossilized colloidal crystals of silica particles, and the sparkle of opals is caused by the energy gaps described above. Elusive photonic crystals come a step closer 2020-09-22T04:00:00Z The building block of all of these minerals is the silica tetrahedron, a combination of four oxygen atoms and one silicon atom. Physical Geology 2015-01-01T00:00:00Z The crystal structure of olivine is built from independent silica tetrahedra. An Introduction to Geology 2017-01-01T00:00:00Z Eventually, the silicon carbide turned into diamonds and silica. Alien planets in deep space could be made of diamonds, researchers suggest 2020-09-20T04:00:00Z Despite being more than 99% silica, the stones also contained traces of other elements, including aluminum, carbon, iron, potassium, and magnesium. Long-lost relic may reveal origins of Stonehenge 2020-07-29T04:00:00Z Sanded grout is almost always just a blend of tinted Portland cement and fine silica sand. Perspective | Tips for installing and cleaning a pebble-stone shower floor 2020-07-21T04:00:00Z Since the silicon ion has a charge of +4 and each of the four oxygen ions has a charge of –2, the silica tetrahedron has a net charge of –4. Physical Geology 2015-01-01T00:00:00Z Members of the pyroxene family have a complex chemical composition that includes iron, magnesium, aluminum, and other elements bonded to polymerized silica tetrahedra. An Introduction to Geology 2017-01-01T00:00:00Z “The salt makes a sodium vapor and a chemical reaction with the silica, and it forms as a soda glass on the pottery.” Alabama man discovers old pottery kiln on a farm 2020-07-25T04:00:00Z A mineral called hydrated silica also seems to be present near the delta. How Nasa's rover will hunt for signs of Mars life 2020-07-23T04:00:00Z Basalt is preferred for ERW as it contains the calcium and magnesium needed to capture CO2, as well as silica and nutrients such as potassium and iron, which are often deficient in intensively farmed soils. Spreading rock dust on fields could remove vast amounts of CO2 from air 2020-07-08T04:00:00Z In olivine, unlike most other silicate minerals, the silica tetrahedra are not bonded to each other. Physical Geology 2015-01-01T00:00:00Z The silica chains are bonded together into the crystal structures by metal cations. An Introduction to Geology 2017-01-01T00:00:00Z Air quality is so bad from churned-up sand and silica, they said, it’s a serious health hazard in the largely low-income agricultural areas near the shore. Column: On this California beach, snowy plovers and dune buggies are in a fight for survival 2020-07-01T04:00:00Z Forty-kilogram mirrors made of highly pure silica sit at both ends of each vacuum chamber. Tiny Gravitational-Wave Detector Could Search Anywhere in the Sky 2020-06-30T04:00:00Z Some farmers in south-east Asia already use it to boost depleted silica in rice fields, while trials in the Netherlands are using it to boost tree planting. Spreading rock dust on fields could remove vast amounts of CO2 from air 2020-07-08T04:00:00Z In pyroxene, silica tetrahedra are linked together in a single chain, where one oxygen ion from each tetrahedron is shared with the adjacent tetrahedron, hence there are fewer oxygens in the structure. Physical Geology 2015-01-01T00:00:00Z When peridotite begins to melt, the silica- rich portions melt first due to their lower melting point. An Introduction to Geology 2017-01-01T00:00:00Z Opal forms from a solution of silica and water, and on Earth the deposits are classic fossil-hunting spots. NASA’s new rover will collect martian rocks—and clues to planet’s ancient climate 2020-06-25T04:00:00Z The sponges, mostly white or translucent, create their skeleton from silica fibers. This Might Be the Longest Creature Ever Seen in the Ocean 2020-04-14T04:00:00Z The 10 violations in Summersville include electrical and forklift hazards, accumulation of combustible material and exposing employees to silica dust. OSHA cites charcoal company for safety hazards in Missouri 2020-02-26T05:00:00Z In mica structures, the silica tetrahedra are arranged in continuous sheets, where each tetrahedron shares three oxygen anions with adjacent tetrahedra. Physical Geology 2015-01-01T00:00:00Z For example, the bases of the geysers in Yellowstone National Park are surrounded by silica deposits called geyserite or sinter. An Introduction to Geology 2017-01-01T00:00:00Z These masks are crucial when we are working with polymer and silica dusts. Your stories from the coronavirus outbreak 2020-02-20T05:00:00Z Silicosis is an untreatable lung disease caused by the inhalation of silica dust that progressively scars the lungs. ‘It’s really tragic’: why are coalminers still dying from black lung disease? 2020-01-24T05:00:00Z The rocks around Jezero show evidence of carbonate and hydrated silica — molecules that are known on Earth to help preserve microscopic fossils over billions of years. The Mars 2020 rover will visit the perfect spot to find signs of life, new studies show 2019-11-16T05:00:00Z In addition to silica tetrahedra, feldspars include the cations aluminum, potassium, sodium, and calcium in various combinations. Physical Geology 2015-01-01T00:00:00Z They are built with a three-dimensional framework of silica tetrahedra in which all four corner oxygens are shared with adjacent tetrahedra. An Introduction to Geology 2017-01-01T00:00:00Z The silica would also block the most destructive UV light. Aerogel Mars 2019-10-19T04:00:00Z He said anytime workers are drilling, mining or carving stone or rock, respirable crystalline silica, a very toxic dust, is likely being liberated in the process. ‘It’s really tragic’: why are coalminers still dying from black lung disease? 2020-01-24T05:00:00Z Because the Martian hydrated silica is so close to a delta, it’s possible that it contains material from the river system. The Mars 2020 rover will visit the perfect spot to find signs of life, new studies show 2019-11-16T05:00:00Z The hardness and lack of cleavage in quartz result from the strong covalent/ionic bonds characteristic of the silica tetrahedron. Physical Geology 2015-01-01T00:00:00Z These minerals, such as calcite, amorphous silica, or oxides, may have a different composition than the sediment grains. An Introduction to Geology 2017-01-01T00:00:00Z The violations involved occupational noise exposure and violations of standards involving crystalline silica, which is the airborne dust arising from working on the stone. Company cited for workplace violations at Missouri Capitol 2019-10-02T04:00:00Z “This is especially true for workers employed making artificial stone countertops, but also holds for workers exposed to silica on construction sites.” ‘It’s really tragic’: why are coalminers still dying from black lung disease? 2020-01-24T05:00:00Z There’s also the question of how to supply silica aerogel on Mars. Can Mars Be Made Habitable in Our Lifetimes? 2019-08-21T04:00:00Z The early-forming olivine crystals react with silica in the remaining liquid magma and are converted into pyroxene, something like this: Physical Geology 2015-01-01T00:00:00Z Hazardous jobs that involve exposure to freshly fractured silica include crushing, milling, processing, drilling, grinding, polishing and cutting materials containing quartz. Sand particles — an overlooked occupational hazard 2019-08-12T04:00:00Z The researchers subjected silica aerogels to Martian conditions in the laboratory, hitting the material with the same amount of solar energy that reaches the Red Planet’s surface. Silica Blankets Could Make Mars Habitable 2019-07-15T04:00:00Z Only one piece highlights coal miners’ present-day concerns about workplace conditions: an article about silica dust causing a resurgence of black lung, that was produced by Reuters and reprinted by the New York Times. The media uses coal miners to attack the Green New Deal — then ignores their pension fight 2019-07-13T04:00:00Z Company executives learned that the fused silica arrays were down to two companies: Heraeus and General Electric. The Simplest and Most Successful Experiment aboard Apollo 11 2019-07-11T04:00:00Z First, as we’ve already discussed, felsic magmas tend to be more viscous because they have more silica, and hence more polymerization. Physical Geology 2015-01-01T00:00:00Z Similar plateaus protected by iron or silica probably exist throughout the slow lands. Dinosaur-age landscapes lurk in Southern Hemisphere 2019-06-26T04:00:00Z And silica aerogels block UV light, so they would also shield anything under them from harmful radiation, team members said. Silica Blankets Could Make Mars Habitable 2019-07-15T04:00:00Z But the rule does not address silica dust, which is prevalent in mechanized modern mining. Coal miners' union urges silica regulation to curb black lung 2019-06-06T04:00:00Z Regulation of silica dust is not just a Trump problem. West Virginia editorial roundup 2019-04-24T04:00:00Z It is dominated by quartz, and in many cases, the original quartz grains of the sandstone are welded together with additional silica. Physical Geology 2015-01-01T00:00:00Z Formed by volcanic flows high in the mineral silica, volcanic glass from Obsidian Cliff was prized by native toolmakers for the production of razor-sharp knives, scrapers, and projectile points. How Yellowstone became the "most scientifically contested piece of ground in America" 2019-04-21T04:00:00Z For example, how exactly would a mission deploy the silica aerogel on Mars? Silica Blankets Could Make Mars Habitable 2019-07-15T04:00:00Z Schablitsky knew that the clay in the pipes absorbed saliva, and that DNA seems to bind with the silica in the clay. DNA on ancient tobacco pipe links Maryland slave site to West Africa 2019-03-15T04:00:00Z Subsequent studies noted these bits were encapsulated in silica, giving them a glassy texture. Radioactive Glass Beads May Tell the Terrible Tale of How the Fukushima Meltdown Unfolded 2019-03-11T04:00:00Z Experts have raised concerns about the presence of silica dust, a hazardous mineral that is released when concrete is demolished and can cause lung cancer. For 250,000 Daily Riders on the L Train, Transportation Purgatory 2019-01-18T05:00:00Z Exposure to silica dust can damage the lungs. Cuomo Swooped in as L-Train Savior, but M.T.A. Rejected Similar Approach Over Safety Concerns 2019-01-15T05:00:00Z These observations, described last October in Monthly Notices of the Royal Astronomical Society, provide the first evidence that silica originated within exploding stars. All Sand on Earth Could Be Made of Star Stuff 2019-01-08T05:00:00Z To create the most realistic rocks, Ostadhassan uses a range of printing approaches, including binder-jet technology, in which a liquid binding agent is applied layer by layer to gypsum powder or silica sand. Five innovative ways to use 3D printing in the laboratory 2019-01-01T05:00:00Z The particles’ glassy texture shows temperatures in some spots reached the extremely high levels needed to melt and vaporize silica. Radioactive Glass Beads May Tell the Terrible Tale of How the Fukushima Meltdown Unfolded 2019-03-11T04:00:00Z Analyzing federal data recorded by dust-collection monitors, the report found that regulators knew miners were at risk from toxic silica dust but failed to take action. After years underground, a Kentucky coal miner with black lung faces the future 2018-12-26T05:00:00Z “Any issues related to silica dust will be managed by the contractor and overseen by an independent consultant, and will be safe for both workers and riders,” he said. Cuomo Swooped in as L-Train Savior, but M.T.A. Rejected Similar Approach Over Safety Concerns 2019-01-15T05:00:00Z The network helps spread the word about oilfield hazards such as lung-damaging silica dust, generated by the large-scale use of sand to hold open fissures in underground rock formations during fracking. Worries about worker dangers grow amid US oil and gas boom 2018-12-21T05:00:00Z Downtown is a stretch of two blocks just west of the former Western Sugar factory whose giant towers now hold fine silica sand used in the region’s rapidly growing hydraulic fracking industry. Small Colorado town has 3 players in NFL 2018-11-03T04:00:00Z Utsunomiya thinks that happened when the containment vessels finally failed and dropped down onto the reactor’s concrete pedestal: Some of the silica in the concrete vaporized into silicon dioxide, which condensed around the particles. Radioactive Glass Beads May Tell the Terrible Tale of How the Fukushima Meltdown Unfolded 2019-03-11T04:00:00Z Part of the problem is that the largest coal seams in central Appalachia have been depleted, prompting coal companies to mine smaller seams that expose miners to a particularly toxic combination of silica and coal. After years underground, a Kentucky coal miner with black lung faces the future 2018-12-26T05:00:00Z In February 2015, a report by Jacobs, an engineering consultant, warned that “weekend construction is not acceptable,” listing concerns over silica dust control and reliability. Cuomo Swooped in as L-Train Savior, but M.T.A. Rejected Similar Approach Over Safety Concerns 2019-01-15T05:00:00Z Regolith contains silica and metallic oxides that make it — on average — 43% oxygen by mass, and it is found everywhere on the Moon. How to build a Moon base 2018-10-23T04:00:00Z The Columbia Hills region, which NASA’s Spirit rover explored between 2004 and 2011, ranked far lower in the scientists’ poll despite having silica deposits similar to those formed by hot springs. Double the fun: Mars scientists push NASA to send rock-harvesting rover to two sites 2018-10-17T04:00:00Z Driving backward while dragging a bad front wheel, Spirit gouged a trench that revealed opaline silica, a mineral that on Earth is a sure sign of life-supporting hot springs. NASA's next Mars rover could explore former mineral springs and a fossil river delta 2018-10-10T04:00:00Z In the southwest corner of Utah, in the shadow of Zion National Park, lies a sandbelt of rich, red, pulverized silica atop which half a dozen four-star golf courses have blossomed in the past quarter-century. Glorious Golf In The High Desert Of Utah - Golf Digest 2018-10-04T04:00:00Z A final version of the Jacobs report released the next year changed how “silica dust control” during weekend work was rated from “not desirable” to “satisfactory.” Cuomo Swooped in as L-Train Savior, but M.T.A. Rejected Similar Approach Over Safety Concerns 2019-01-15T05:00:00Z He then identified silica as a "crucial material" for developing fibre optic communications. Tributes paid to 'father of fibre optics' 2018-09-26T04:00:00Z Conventionally, it was difficult to produce anything more than 50% using FT synthesis, in a process usually based on iron or cobalt catalysts supported on silica or aluminium oxide. Clever chemistry offers new source of jet fuel 2018-09-17T04:00:00Z Ruff has even proposed that the martian silica deposits are stromatolites. NASA's next Mars rover could explore former mineral springs and a fossil river delta 2018-10-10T04:00:00Z Black lung is an often fatal condition contracted by miners who breathe in coal and silica dust on the job. On the disturbing return of black lung 2018-08-02T04:00:00Z Removing parts of the concrete bench wall could create silica, a mineral that can cause an incurable lung disease or lung cancer if inhaled, according to the Occupational Safety and Health Administration. Cuomo Swooped in as L-Train Savior, but M.T.A. Rejected Similar Approach Over Safety Concerns 2019-01-15T05:00:00Z Minnesota Sands argued the ordinance benefits in-state operations that are free to mine silica sand for other uses while banning those that sell the sand for out-of-state fracking operations, the Star Tribune reported . Minnesota appeals court upholds Winona County frack sand ban 2018-07-30T04:00:00Z At one point, while digging through their belongings, a silica packet falls out and Adam immediately takes the opportunity to be absurd. What’s In Your Bag, Peking Duk? 2018-07-27T04:00:00Z The vegan toner is all-natural, using ingredients such as vegetable glycerin, silica, iodine and oil of spearmint to calm redness, tighten pores and provide a hydrated glow. Local toner provides a hydrated glow — naturally | Produced by Advertising Publications 2018-07-18T04:00:00Z Twenty tenants and former tenants of a converted Brooklyn warehouse say the family firm once run by presidential adviser Jared Kushner also exposed them to dust containing lead and the carcinogen crystalline silica. The Latest: NY to probe claims Kushners harassed tenants 2018-07-16T04:00:00Z But the earlier report raised concerns that the construction work could create silica dust, a hazardous mineral that would be difficult to remove during a short weekend closing. Cuomo Swooped in as L-Train Savior, but M.T.A. Rejected Similar Approach Over Safety Concerns 2019-01-15T05:00:00Z Dust samples taken from nine apartments in May by consultants Olmsted Environmental Services turned up dangerously high levels of lead and crystalline silica. Kushner tenants: We were pushed out for luxury condo buyers 2018-07-15T04:00:00Z “Reuben actually once ate a packet of silica gel and that’s why he’s dry on the inside, wet on the outside.” What’s In Your Bag, Peking Duk? 2018-07-27T04:00:00Z The high silica concentration means the magma is more viscous, or resistant to flow — so any gases it contains struggle to expand. I Regret to Inform You: Kilauea Rumors Aren't At All True 2018-07-01T04:00:00Z Miners are working with thinner coal seams, meaning they are cutting into more rock that contains the silica, which is more damaging to lungs than coal dust. Study looks at ways to control dust coal miners breathe 2018-06-28T04:00:00Z Leaders on the project said efforts to contain the silica dust would depend on how much concrete is removed. Cuomo Swooped in as L-Train Savior, but M.T.A. Rejected Similar Approach Over Safety Concerns 2019-01-15T05:00:00Z The magma at Mount St. Helens was evolving and full of silica, which has a similar effect as glue, making it thicker and preventing the release of gases and steam. Volcanologist at CU offers expertise on eruptions 2018-05-28T04:00:00Z Reuben actually once ate a packet of silica gel and that’s why he’s dry on the inside, wet on the outside. What’s In Your Bag, Peking Duk? 2018-07-27T04:00:00Z That silica content is the key to understanding why Kilauea behaves differently from volcanoes seen on land. No, Hawaii's Volcano Won't Trigger a Mega-Tsunami 2018-05-17T04:00:00Z “Increased silica exposure appears to explain at least some of the observed cases of rapidly progressive” black lung disease, the report said. Study looks at ways to control dust coal miners breathe 2018-06-28T04:00:00Z The new plan also removes a smaller amount of the concrete bench walls that can release silica dust, Mr. Jannetti said. Cuomo Swooped in as L-Train Savior, but M.T.A. Rejected Similar Approach Over Safety Concerns 2019-01-15T05:00:00Z But the magma, which is actually called lava once it surfaces, at Kilauea has far less silica and allows the release of gases and steam much easier, so a huge pressure buildup does not occur. Volcanologist at CU offers expertise on eruptions 2018-05-28T04:00:00Z Southern Minnesota and western Wisconsin have rich deposits of a form of silica that’s in high demand for hydraulic fracturing. Court to hear challenge to Winona County’s sand mining ban 2018-05-07T04:00:00Z Bitz said she was “not very optimistic” about Ice911’s plan as it creates “very small particulates that are very dangerous for ecosystems”, despite Field’s assurances that the silica will be harmless to wildlife. Could sprinkling sand save the Arctic's shrinking sea ice? 2018-04-23T04:00:00Z It recommended the development of a silica monitor that detects those levels in the air. Study looks at ways to control dust coal miners breathe 2018-06-28T04:00:00Z At the board meeting, Polly Trottenberg, the city’s transportation commissioner, asked how the agency would handle silica dust and how long the construction work would last. Cuomo Swooped in as L-Train Savior, but M.T.A. Rejected Similar Approach Over Safety Concerns 2019-01-15T05:00:00Z “Idiopathic” means the cause is unknown, but Pellerin theorized that the culprit was exposure to silica and other materials used in dental treatments like crowns, veneers and sealing products. Virginia dentist tips off CDC to dentists with rare disease 2018-04-15T04:00:00Z The structure resembles that of tightly packed silica spheres in opal, which diffract light and produce the gemstone’s coveted color. Scientists uncover the secret behind shimmering seaweed 2018-04-13T04:00:00Z "Complexation of iron by the dust surface may be central in collagen deposition after silica exposure" One might suspect the iron itself, you never targeted? TB Treatment May Leave Some Patients Contagious 2018-04-06T04:00:00Z Iron–silica interaction at extreme conditions and the electrically conducting layer at the base of Earth’s mantle. Hadean silicate differentiation preserved by anomalous 142Nd/144Nd ratios in the Réunion hotspot source 2018-02-27T05:00:00Z Werntz says higher amounts of silica dust in the air, difficult airflow and longer exposure to dust increase risk and may be contributing to the high prevalence. WVU researcher notes complicated black lung cases 2018-02-09T05:00:00Z A CDC report in 2004 noted a cluster of nine dental lab workers in five states who contracted “silicosis,” a debilitating, sometimes fatal lung disease caused by inhaling crystalline silica dust. Virginia dentist tips off CDC to dentists with rare disease 2018-04-15T04:00:00Z The holes would allow the firm to collect subsurface data to determine the silica deposit at that site. Proposed drilling project stirs up residents 2018-02-04T05:00:00Z Sanded grout is a blend of Portland cement and fine silica sand. Analysis | How to install a pebble shower floor 2017-11-28T05:00:00Z It and surrounding counties, including Adams County, where Sand Valley is located, were known as "sand counties" because of the prevalence of glacially deposited gravel and silica. Golf Digest's Best New Course of 2017: Sand Valley - Golf Digest 2017-12-08T05:00:00Z Studies of water and ice in hydrophilic and hydrophobic mesoporous silicas: pore characterisation and phase transformations. Role of stacking disorder in ice nucleation 2017-11-07T05:00:00Z Robbins, P. E. & Toole, J. M. The dissolved silica budget as a constraint on the meridional overturning circulation of the Indian Ocean. Abyssal ocean overturning shaped by seafloor distribution 2017-11-07T05:00:00Z Each of those craft was fitted with more than 24,000 tiles made from high-grade silica sand. A new ceramic could help hypersonic planes take off 2017-08-10T04:00:00Z Snares, a hacksaw blade, seeds, silica packs and oxidizer to reduce the effects of moisture. America's midlife crisis: lessons from a survivalist summit 2017-08-02T04:00:00Z On the far end of life, a machine was imagined that could turn a corpse’s water into silica. David Jones, British chemist and ‘court jester in the palace of science,’ dies at 79 2017-07-31T04:00:00Z A cooperative management agreement involves silica and sand company U.S. Partnership to preserve portion of US military supply route 2017-06-26T04:00:00Z The terraces, a large, bright white and pink set of cascading rocks, were once considered the largest deposit of silica sinter, a type of quartz. '8th World Wonder' May Lie Below Volcanic Lakeshore 2017-06-14T04:00:00Z Most sand consists chiefly of quartz, the commonest form of silica, but there are other kinds. The World Is Running Out of Sand 2017-05-22T04:00:00Z Claysburg lost most of its refractories - mills that produced silica bricks used in steel production - gradually by the 1980s. Some towns rebound, others wither as manufacturing declines 2017-05-06T04:00:00Z But the links between occupational exposure to silica and beryllium dust and lung disease are well documented. “It couldn’t get much worse”: Trump’s policies are already making workplaces more toxic 2017-04-16T04:00:00Z They are themselves fossils, prehistoric walnuts turned hard and glassy after a volcanic eruption 45 million years ago bathed them in silica. Perspective | Museum quality: Check out these two squirrels, one historic, one prehistoric 2017-04-09T04:00:00Z For the use of other porous supports, secondary growth methods that rely on the presence of a silica sol or gel should be employed. Ultra-selective high-flux membranes from directly synthesized zeolite nanosheets : Nature : Nature Research 2017-03-14T04:00:00Z Warren grilled Acosta on his commitment to the “silica rule,” which affects over 2 million workers exposed to respirable crystalline silica daily, protecting them from being poisoned. WATCH: Elizabeth Warren exposes Trump’s dodgy new labor pick in brutal confirmation hearing 2017-03-23T04:00:00Z Once a thriving silica center nicknamed “Bricktown,” the town lost its industry and the bulk of its population in the same downturn that struck Claysburg. Some towns rebound, others wither as manufacturing declines 2017-05-06T04:00:00Z Shufeng Song at Chongqing University in China and his colleagues developed a hybrid solid electrolyte for sodium batteries by combining solid polyethylene oxide, sodium perchlorate and silica with an ionic liquid. Energy: Sodium battery packs a punch : Nature : Nature Research 2017-03-21T04:00:00Z It must first show the Nuclear Regulatory Commission how it’ll address alkali silica reaction, which causes concrete erosion. Public input sought for concrete erosion plan at nuke plant 2017-02-21T05:00:00Z The edge of a silica fibre from the main body of the porous support is also visible. Ultra-selective high-flux membranes from directly synthesized zeolite nanosheets : Nature : Nature Research 2017-03-14T04:00:00Z “It’s going to be noise, it’s going to be light, silica dust,” said Tom Lister, the attorney representing the plaintiffs. Jackson County residents aim to block frack sand mining 2017-02-13T05:00:00Z In Claysburg, the decline of silica bricks was years in the making as steel waned across the country, said Rich Allison, a community activist and historian who once was president of General Refractories. Some towns rebound, others wither as manufacturing declines 2017-05-06T04:00:00Z Once the silica fibres are installed and other improvements are made, that could rise to one-half, meaning Virgo could scan a cosmic region eight times larger than with steel wires. LIGO’s underdog cousin ready to enhance gravitational-wave hunt 2017-02-07T05:00:00Z Wear a special mask so you don’t breathe in the silica dust. How to fix crumbling concrete 2016-11-08T05:00:00Z The edge of a silica fibre from the main body of the porous support is also visible. Ultra-selective high-flux membranes from directly synthesized zeolite nanosheets : Nature : Nature Research 2017-03-14T04:00:00Z Maine business Auburn Manufacturing, Inc. led the fight, which concerned amorphous silica fabric, or ASF. Feds back Maine fabric company in trade dispute with China 2017-01-19T05:00:00Z A portion of the site was used decades ago to extract a type of rock containing silica. Developers eyeing mine site expected to re-submit proposal 2017-01-10T05:00:00Z But for now, the lab plans to forge ahead with the steel wires and replace them later with the silica fibres. LIGO’s underdog cousin ready to enhance gravitational-wave hunt 2017-02-07T05:00:00Z Start with the fundamentals of what an effective toothpaste should contain: fluoride to strengthen enamel and a mild abrasive such as calcium carbonate or micronized silica to remove food debris and surface stains. Whitener, sensitive teeth, plaque fighter: How to choose a toothpaste 2016-10-28T04:00:00Z PPG’s Westlake facility treats silicas - a hard mineral found in rock - for use in industrial and consumer applications, such as tire manufacturing and footwear. PPG fined $92,642 for safety violations 2016-10-20T04:00:00Z Her team confirmed that the “sea” was indeed silica. How Earth’s oldest animals were fossilized 2016-10-19T04:00:00Z There, Spirit found deposits of a mineral called opaline silica at a site known as Home Plate. NASA’s Bold Plan to Hunt for Fossils on Mars Through regulations on ozone, mercury, carbon, coal-mine dust, and crystalline silica, President Obama has proudly put all public coal companies, and many private ones, out of business. Mining Taxpayers’ Pockets for Private-Pension Relief 2016-09-08T04:00:00Z These range from flanges, to memory foam, to ear hooks, to silica gel buds each offered in a variety of shapes and sizes. Apple could, and probably should bundle wireless earbuds with the next iPhone 2016-08-10T04:00:00Z The region has high-quality silica sand that works well in the process; according to the report, 92 sand mines are currently active in the area. Environmentalists challenge DNR sand mine pollution findings 2016-07-10T04:00:00Z So silica was the perfect candidate for a prehistoric glue. How Earth’s oldest animals were fossilized 2016-10-19T04:00:00Z NASA's Spirit rover captured this image of silica formations on Mars that look very similar to cauliflower-like structures built by microbes on Earth. NASA’s Bold Plan to Hunt for Fossils on Mars The black is formed from iron particles, the white is from petrified silica crystals while the fossilization took place, and the pastel and peach colors from manganese, she says. A Jewelry Designer’s Prehistoric Inspiration 2016-06-29T04:00:00Z Embedding silica with a solution is a clever approach, said Siddarth Srinivasan, a researcher of fluid mechanics and surfaces at Harvard University who was not involved in the research. Bottles That Could Make Every Drop of Shampoo Count 2016-06-26T04:00:00Z Silicosis is an incurable disease caused by inhaling silica dust from gold-bearing rocks. South African mining firms to appeal silicosis ruling 2016-06-03T04:00:00Z Finally, the team concluded that the silica-based cements were not chemically identical to the silica found in the quartz sand grains, leaving them with only one source for the cement: seawater. How Earth’s oldest animals were fossilized 2016-10-19T04:00:00Z For instance, the Mars 2020 fossil hunters will look for chert and silica—two types of minerals that, on Earth, are ideal for entombing and preserving biological material. NASA’s Bold Plan to Hunt for Fossils on Mars Wang and his colleagues unpicked the brew’s recipe by examining these yellow residues and scrutinising the size and shape of starch grains and phytoliths - tiny pieces of silica that form within plant cells. Cask from the past: archaeologists discover 5,000-year-old beer recipe 2016-05-23T04:00:00Z This polypropylene is so durable, he added, because the silica structures used to create roughness are embedded in the plastic, rather than sitting on top of it. Bottles That Could Make Every Drop of Shampoo Count 2016-06-26T04:00:00Z The bridge, built in 1969, was damaged by alkali silica reaction, more commonly known as "concrete cancer". Merafield Bridge in Plympton demolished - BBC News 2016-05-16T04:00:00Z The countertops are made from processed quartz, a material containing silica levels as high as 90 percent, or twice the amount found in marble. Popular Quartz Countertops Pose a Risk to Workers 2016-04-01T04:00:00Z In 2008, the Spirit rover captured images of unusual, cauliflower-shaped silica formations inside Mars’s Gusev Crater that bear an uncanny resemblance to objects sculpted by bacteria living inside hot springs on Earth. NASA’s Bold Plan to Hunt for Fossils on Mars That is largely because it navigated a transition from making shirting and apparel lining to more specialized, flame-resistant fabrics, with fibers including silica and fiberglass. U.S. Textile Industry Turns to Tech as Gateway to Revival 2016-04-01T04:00:00Z The packets were determined to be silica, which is used for food preservation, police said. Alaska school children plotted to poison classmate: police 2016-03-31T04:00:00Z The main ingredients in Tom’s of Maine Simply White toothpaste, for instance—including sodium fluoride, hydrated silica, sorbitol and sodium lauryl sulfate—are also in some types of Colgate toothpaste. ‘Natural’ Product Claims Can Be Murky 2016-03-30T04:00:00Z The risks posed by the countertops are receiving new scrutiny after the Occupational Safety and Health Administration last week announced long-delayed rules to sharply reduce exposure to silica among workers. Popular Quartz Countertops Pose a Risk to Workers 2016-04-01T04:00:00Z As is the case with stromatolites, though, the silica cauliflowers could also be natural formations, and scientists would need to study them up close to know for sure. NASA’s Bold Plan to Hunt for Fossils on Mars If there is a fire, the silica and fiberglass become a seal, blocking oxygen from getting into the mattress so it is less likely to burn. U.S. Textile Industry Turns to Tech as Gateway to Revival 2016-04-01T04:00:00Z Capping a decades-long effort, U.S. workplace regulators on Thursday announced a final rule to boost protections against occupational exposure to crystalline silica, a carcinogenic dust ubiquitous in construction, foundries and fracking. U.S. regulators finalize new silica limits for construction, other industries 2016-03-24T04:00:00Z The Labor Department plans to announce on Thursday new rules that sharply reduce workplace exposure to silica, a potentially deadly mineral found in materials commonly used in construction and hydraulic fracturing, or fracking. New Rules Aim to Reduce Silica Exposure at Work Sites 2016-03-24T04:00:00Z When slabs of engineered stone are cut and finished to fit a kitchen or bathroom, large quantities of silica particles are released. Popular Quartz Countertops Pose a Risk to Workers 2016-04-01T04:00:00Z The agency said in a news release those actions include reduction of chronic violators, historic low levels of respirable coal dust and silica and record low numbers of mining deaths. Assistant labor secretary says mine safety has improved 2016-03-23T04:00:00Z The researchers say that encapsulation in silica is roughly comparable to that of fossilized bones. DNA data storage could last thousands of years 2016-03-22T04:00:00Z It also requires employers to monitor silica in the workplace, use specific methods to reduce exposure and provide medical exams to workers, among other measures. U.S. regulators finalize new silica limits for construction, other industries 2016-03-24T04:00:00Z In a speech this year to an energy industry group, Dr. David Michaels, the director of OSHA, stated that many oil and gas companies were not meeting the current silica exposure standard. New Rules Aim to Reduce Silica Exposure at Work Sites 2016-03-24T04:00:00Z Its cement supports began to disintegrate because of a chemical problem known as alkali silica reaction. Officials bid farewell to the 6th Street Viaduct 2016-01-27T05:00:00Z Cummings reached into a pocket to extract one of the Sherburne artifacts: The results of Shovel Test No. 86, a piece of Tongue River silica, a little bigger than a quarter. Archaeologists seek cultural evidence in Sherburne refuge 2015-12-20T05:00:00Z In the younger sandstone, the scientists found a different type of silica known as Opal-A along fractures in the rocks. Mars Rover Finds Changing Rocks, Surprising Scientists 2015-12-17T05:00:00Z He then slathers the form with a thick mixture of plaster and silica reinforced with chicken wire. The Origin’s of a One-of-a-Kind Glass Vessel 2015-10-29T04:00:00Z But he said he thought that many companies would easily adapt to the new standard because inexpensive equipment is available to control and trap the release of silica dust. New Rules Aim to Reduce Silica Exposure at Work Sites 2016-03-24T04:00:00Z Weird titanium and silica objects were found in the engine at the crash site, but there was no way to confirm if these objects caused the explosion. NASA and Orbital Sciences don't agree on what caused last year's rocket explosion 2015-10-30T04:00:00Z Key indicators of hidden vent activity include the presence in the plumes of silica particles and methane. Cassini probe to sweep over Saturn's moon Enceladus - BBC News 2015-10-27T04:00:00Z They typically won’t pay for wheelchair vans, exposure to asbestos, silica dust or mold, assaults unless the employee is defending “an employer’s business or property,” chiropractors or any more than 75 home health care visits. Corporate America’s unforgivable new swindle: Leveling workers’ compensation to nothing 2015-10-22T04:00:00Z One-third of her neural plate failed in the past week, the resinous silica fracturing. Copyfactory : Nature : Nature Publishing Group 2015-10-13T04:00:00Z Officials estimate that the new silica standard, when fully in effect, will save 600 lives and prevent 900 new cases of silicosis every year. New Rules Aim to Reduce Silica Exposure at Work Sites 2016-03-24T04:00:00Z Giant is a cone geyser, as opposed to a fountain geyser that erupts from a pool, with a large tree-trunk-like mouth built up from the silica ejected during eruptions. Yellowstone’s 2nd-largest geyser erupts for nearly an hour 2015-09-29T04:00:00Z Spirit found silica deposits that may have been deposited by a hydrothermal system -- one that could have nourished life billions of years ago. Mars scientists tap ancient river deltas and hot springs as promising targets for 2020 rover 2015-08-06T04:00:00Z The region sampled shows high concentrations of silica. Around The Universe: New ISS Crew; Earth From Above; Pluto's Atmosphere; A Galactic Nursery 2015-07-26T04:00:00Z Their idea was to encapsulate encoded DNA inside of silica spheres 150 nm in diameter. The Information Within Ourselves 2015-07-20T04:00:00Z Scientists counted the number of atoms in a reflective sphere of one kilogram of silica. Elusive Quest for One True Kilogram Finally Pays Off 2015-07-16T04:00:00Z Coal mine and silica dust are known risks. COPD, Asthma and the Environment 2015-05-20T04:00:00Z Highly acidic fluids dissolved silica from quartz-rich sandstones that then later precipitated as precious opal. Dazzled by Australia's precious opals - BBC News 2015-05-08T04:00:00Z If Blood Falls does indeed reflect their geochemical makeup, then they may carry abundant nutrients—particularly iron and silica—into the iron-poor Southern Ocean. Salty water lurks beneath Antarctica 2015-04-28T04:00:00Z There, Bond and his colleagues examined chert rocks—silica formations, created by the skeletons of dead sponges, that also contain many species of brachiopods. Sixth extinction, rivaling that of the dinosaurs, should join the big five, scientists say 2015-04-16T04:00:00Z Drip tip, of course, and then a wire coil with a dual silica wick. California vaping: The new subculture 2015-04-05T04:00:00Z Dr. Hsu said the dust was probably silica, a molecule of one silicon and two oxygen atoms, the building block of the mineral quartz. Suddenly, It Seems, Water Is Everywhere in Solar System 2015-03-12T04:00:00Z Hsu and his colleagues ran laboratory experiments to explore the conditions under which the tiny silica particles form. Hints of hot springs found on Saturnian moon 2015-03-10T04:00:00Z “Regarding air pollution, silica generated from the mine is dissipated in miniscule amounts,” says Engdahl. Some fear historic cemetery could be damaged by mining 2015-02-21T05:00:00Z There, researcher Robert Grass and colleagues created DNA labels encapsulated in small, food-safe silica particles that are already used as additives in certain foodstuffs. Quick DNA Scans Could Ensure Food Is Safe to Eat 2015-02-04T05:00:00Z The problem, of course, was that sand releases a fine silica dust—and it tends to track paw prints all over the house. You won’t believe how old that Kitty Litter is 2015-02-02T05:00:00Z The Detroit airport runway is affected by a process called alkali/silica reaction, or ASR. Rebuild planned for 15 years old Detroit runway 2015-01-04T05:00:00Z Now, Hsu’s team describes particles made not just of salt but also of silica. Hints of hot springs found on Saturnian moon 2015-03-10T04:00:00Z Others have fibres of silica, which could irritate users’ lungs, in the vapour. Vapour trail 2014-12-17T05:00:00Z Workers face the greatest exposure risk, but “residents near quarries and sand and gravel operations potentially are exposed to respirable crystalline silica,” the report states. State eyes air study near fracking sand facility 2014-12-13T05:00:00Z These are made of hydrocarbon particles—so they are more similar to mounds of soot than to Earth's sand, which is mostly silica—and are some of the biggest in the Solar System. Giant Dunes on Saturn Moon Track Its Ancient Climate 2014-12-08T05:00:00Z These are made of hydrocarbon particles — so they are more similar to mounds of soot than to Earth's sand, which is mostly silica — and are some of the biggest in the Solar System. Titan's giant dunes track ancient climate 2014-12-07T05:00:00Z US researchers carried out miniature ballistic tests by firing tiny silica spheres at sheets of graphene. Graphene promise for body armour 2014-11-28T05:00:00Z But now the material has been targeted by 'bullets' for the first time, with tiny silica spheres being fired at layers of graphene. Bullet-proof armour and hydrogen sieve add to graphene’s promise 2014-11-26T05:00:00Z Whoever does the testing, their results could be useful for the Lackawanna Valley, which hosts at least two active silica sand transfer facilities - one in Taylor and another in the Pittston area. State eyes air study near fracking sand facility 2014-12-13T05:00:00Z Goodyear is working with companies in Asia to eventually process tens of thousands of tons of silica from rice husk ash. Goodyear aims to use rice husk byproduct in tires 2014-09-28T04:00:00Z By creating a database of all possible chemical formulations, the MIT research team found 1.5 parts calcium to every 1 part silica to be the "magical ratio," according to Pellenq. New Formula Could Cut Pollution from Concrete 2014-09-26T04:00:00Z We reserved one of the six private rooms, where there’s a shared lounge with fireplace and an indoor silica pool. A Thrilling Week of Fire and Ice: Driving Iceland's Ring Road 2014-09-24T04:00:00Z Harron worked for a Moss Point firm called Netherland & Mason that screened potential plaintiffs for claims that their lungs were damaged by exposure to asbestos or silica. Court says Miss. can discipline W.V. radiologist 2014-09-23T04:00:00Z The inspectors will focus on the dangers posed by working at height, working with asbestos, the control of silica dust and use of mechanical lifting equipment for heavy materials. Building site safety checks to begin 2014-08-15T04:00:00Z Goodyear is not the only tire manufacturer - or industry - exploring the use of silica from rice husk ash. Goodyear aims to use rice husk byproduct in tires 2014-09-28T04:00:00Z The silicon in these chips uses silica that has been stripped of its two oxygen molecules and refined into one of the purest materials on the planet. The next silicon revolution? 2014-08-01T04:00:00Z Monte says some silica is leaking from a boxcar, but the leak is not dangerous. 6 railroad cars derail in Baton Rouge 2014-08-01T04:00:00Z "When these are in place silica dust is usually reduced to significantly below the exposure limit," she said. Call for greater silica safeguards 2014-07-22T04:00:00Z Rice hulls are unique in nature, made of a silica structure that agronomists describe as a “biogenic opal”—a plant-made mineral that stands between a rice kernel and its would-be consumer. The Rube Goldberg of Rice 2014-07-10T04:00:00Z Dave Zanzig, Goodyear’s director of global material science, said it’s hoped there would be momentum throughout the tire industry to use silica from rice husk ash. Goodyear aims to use rice husk byproduct in tires 2014-09-28T04:00:00Z Having got your silica, usually in the form of sand, you heat it until it melts - about 1,600C. The next silicon revolution? 2014-08-01T04:00:00Z Breathing so-called silica dust can cause silicosis, a lung disease. Boom Meets Bust in Texas: Atop Sea of Oil, Poverty Digs In 2014-06-29T04:00:00Z A study published today finds that the disco clam achieves this using nanoparticles of silica to reflect light. How the disco clam got its flash 2014-06-24T04:00:00Z We report that single iron sites embedded in a silica matrix enable direct, nonoxidative conversion of methane, exclusively to ethylene and aromatics. [Report] Direct, Nonoxidative Conversion of Methane to Ethylene, Aromatics, and Hydrogen 2014-05-08T18:26:38.553Z When silica is added to a tire tread recipe, it helps reduce tires’ road resistance, a phenomenon that causes vehicle engines to work harder and consume more fuel. Goodyear aims to use rice husk byproduct in tires 2014-09-28T04:00:00Z The main ingredient, silicon dioxide or silica, is everywhere. The next silicon revolution? 2014-08-01T04:00:00Z Figure 1: Electronic transitions between the valence and conduction bands of silica in a strong optical field. Addendum: Optical-field-induced current in dielectrics 2014-03-19T18:22:43.387Z The disco clam is also one of only a few organisms that use silica as the reflector. How the disco clam got its flash 2014-06-24T04:00:00Z When the researchers dropped a silica bead into a layer of liquid crystals, capillary forces drew the crystals into hundreds of tiny petals around the bead to form the flowerlike pattern pictured here. Self-Assembling Flower Petals in Liquid Crystals Focus Light 2014-03-17T12:00:00Z Most silica for tires is produced by incinerating sand at around 2,500 degrees Fahrenheit. Goodyear aims to use rice husk byproduct in tires 2014-09-28T04:00:00Z Silica is the basis of most rocks, the reason they all seem so different is because of the different processes by which they are formed and the different crystals silica creates with other compounds. The next silicon revolution? 2014-08-01T04:00:00Z Here we correct this error in by plotting the adiabatic levels of silica for the value of that we actually used. Addendum: Optical-field-induced current in dielectrics 2014-03-19T18:22:43.387Z The present rules generally advise limiting exposure to roughly 100 micrograms of crystalline silica per cubic metre of air, averaged over 8 hours. Dust regulations trigger backlash 2014-03-05T18:50:31.676Z Crystalline silica dust is produced by processes such as concrete grinding and sandblasting in construction and other industries. Full disclosure 2014-03-05T18:50:02.822Z The present rules generally advise limiting exposure to roughly 100 micrograms of crystalline silica per cubic meter of air, averaged over 8 hours. Tougher Regulations on Deadly Silica Dust Trigger Backlash 2014-03-04T20:40:00Z People with a history of silica exposure may also qualify to undergo screening for lung cancer using CT scanning, the investigators note. OSHA plans to slash silica workplace exposure limits 2014-01-01T16:46:39Z His team did one animal experiment: It injected the smallpox vaccine virus into mice still in the silica coating. Global Health: Preserving Vaccines 2013-12-23T21:35:53Z Peg Seminario, director of safety and health for the AFL-CIO, points to an update of the nation’s silica standards proposed on Sept. White House delayed enacting rules ahead of 2012 election to avoid controversy 2013-12-14T23:35:25Z “It’s a very important rule — there are over two million workers exposed to silica,” she said. New Rules Would Cut Silica Dust Exposure 2013-08-24T00:17:14Z Many sponges build pointy microscopic spicules made of protein, silica, or calcium carbonate that help support their bodies and defend against predators. Glass Sponges Poriferify -- and Beautify -- Impoverished Antarctic Neighborhood 2013-08-08T22:45:13.887Z Crystalline 'flower' grown on the nanoscale from the minerals silica and barium carbonate. Nanotech roundup: ultra-colour TV, nano-flowers and Trojan blood cells 2013-06-25T06:00:04Z Once the silica coats were rinsed off, some of the viruses were able to infect cells again. Global Health: Preserving Vaccines 2013-12-23T21:35:53Z The stalled regulations included crucial elements of the Affordable Care Act, what bodies of water deserved federal protection, pollution controls for industrial boilers and limits on dangerous silica exposure in the workplace. White House delayed enacting rules ahead of 2012 election to avoid controversy 2013-12-14T23:35:25Z Crystalline silica — tiny particles no more than one-hundredth the size of grains of sand — is created during work with stone, concrete, brick or mortar. New Rules Would Cut Silica Dust Exposure 2013-08-24T00:17:14Z The Oxford English Dictionary's longest word, at 43 letters, is pneumonoultramicroscopicsilicovolcanoconiosis, which refers to a lung disease caused by inhalation of silica dust. So long, long words? 2013-06-04T11:51:53Z This silica gradually accumulates, and the scale matures. Coffee interferes with construction efforts... if you're an amoeba 2013-05-08T02:45:05.043Z Two primitive meteorites collected in Antarctica appear to contain grains of silica—the stuff of quartz and sand—forged in an ancient supernova that predates the birth of the solar system. Supernova Dust Fell to Earth in Antarctic Meteorites 2013-04-24T20:45:00.380Z Some sites showed the presence of contaminants including asbestos, carbon monoxide, lead and silica. OSHA: Sandy contamination below permissible limits 2013-01-10T03:31:05Z One government study found that many workers in hydraulic fracturing, known as fracking, were exposed to 10 times the permissible level of silica. New Rules Would Cut Silica Dust Exposure 2013-08-24T00:17:14Z So if nature were to provide grains of silica suitable for use without processing, that would be a bonus. Fuel-saving tyres: Hysterectomy 2013-01-03T16:05:38Z I distributed flyers advertising my calculus and computer-programming skills around the department, and was hired to write programs to process isotope data looking at dust inputs and silica cycling in soil ecosystems. Turning point: Sarah Aciego 2012-11-28T18:20:49.287Z But these traditional types - made from silica - are fragile and brittle. Strength added to 'solid smoke' 2012-08-20T14:57:58Z The fall followed a loss at its fused silica business, whose products are used in the flagging photovoltaic panels market. Arm adds 8% despite Apple disappointment while FTSE flatlines 2012-07-25T16:21:55Z Diatoms, a type of phytoplankton that builds hard external silica shells, dominated the bloom, peaking around the fourth week of the experiment. Green Blog: A Way to Trap Carbon Deep in the Ocean 2012-07-19T11:28:05Z Most exciting, they realized that the tooth enamel still had plant phytoliths—microscopic plant fossils that form in distinctive shapes when different plants absorb silica. Early Human Ate Like a Giraffe 2012-06-27T18:07:00Z In her case, thick, sticky dacite, a type of magma rather rich in silica, was making its laborious way up toward the surface. Prelude to a Catastrophe: "Something Dramatic" 2012-06-21T16:45:07.023Z Traditional aerogels developed decades ago and made from the silica that is found in beach sand are brittle, and break and crumble easily. Strength added to 'solid smoke' 2012-08-20T14:57:58Z Silica, the No. 2 U.S. commercial silica maker, said in a statement. UPDATE 1-US Silica, BNSF Railway to build storage facility 2012-06-18T15:43:39Z Dr. Smetacek suggests that the new results would apply anywhere in the ocean where high levels of silica are present to allow diatoms to bloom. Green Blog: A Way to Trap Carbon Deep in the Ocean 2012-07-19T11:28:05Z Diatoms are encased within a hard cell wall made from silica, which is known as a frustule and is composed of two halves. Art of science: extremely small, incredibly close 2012-06-16T23:01:00Z These contain the mineral silica, which is thought to improve hair thickness, Jackson Blatner says. 10 Best Foods for Your Hair 2012-06-14T14:50:00Z The new varieties are made by altering the innermost architecture of traditional silica aerogels. Strength added to 'solid smoke' 2012-08-20T14:57:58Z The consequences of overexposure to silica and beryllium are beyond awful. The deregulatory racket 2012-06-13T15:09:00Z On early Earth for example, minerals, such as silica, are important because they preserved the record of carbon. Robotic probe to seek Martian life with new focus 2012-06-11T17:24:36Z This is a very acid granite, silica probably constituting around 70 per cent of the total mass. Mohave Pottery 2012-04-26T02:00:09.420Z The effect is even perceptible at a temperature as low as 220� C. Hydrogen, and, in a much less degree, oxygen and nitrogen, will also permeate silica, but only at higher temperatures. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 2 "Hearing" to "Helmond" 2012-04-25T02:00:53.567Z After microscopic shards of silica slip into exposed skin of susceptible individuals, the bottoms of the feet swell. Vanquishing "Mossy Foot" with Genetic Epidemiology and Shoes 2012-04-17T15:45:00.223Z We begin with ultramafic and mafic melts, which is basically a fancy way of saying magmas that have very little silica and a lot of magnesium and iron. The Real Heart of the Ocean 2012-04-14T14:45:05.383Z A salt of metasilicic acid; Ð so called because the ratio of the oxygen of the silica to the oxygen of the base is as two to one. Webster's Unabridged Dictionary (2nd 100 Pages) 2012-03-24T02:00:19.387Z These are all essentially the same in composition, being composed of an animal substance resembling coagulated albumen, together with sulphur, silica, carbonate and phosphate of lime, and oxides of iron and manganese. Sheep, Swine, and Poultry Embracing the History and Varieties of Each; The Best Modes of Breeding; Their Feeding and Management; Together with etc. 2012-03-21T02:00:35.167Z Thorianite, however, contains no silica, and until it is shown that metallic oxides behave in the same way this explanation must be accepted with reserve. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 2 "Hearing" to "Helmond" 2012-04-25T02:00:53.567Z The team is currently studying tiny silica crystals called phytoliths that are embedded in the tartar. First of Our Kind: Could Australopithecus sediba Be Our Long Lost Ancestor? 2012-03-20T15:15:04.437Z Some of those country rocks have a low silica content, but lots of aluminum. The Real Heart of the Ocean 2012-04-14T14:45:05.383Z It is of variable composition, containing usually silica, lime, and potash, rarely soda, but no lead. Webster's Unabridged Dictionary (2nd 100 Pages) 2012-03-24T02:00:19.387Z Closely related to carbon is silica also, as a substitution in certain organic compounds. Astronomy: The Science of the Heavenly Bodies 2012-03-17T02:01:02.630Z Finely powdered silica is a very bad conductor, but in the compact form of rock crystal it is as good a conductor as some of the metals. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 2 "Hearing" to "Helmond" 2012-04-25T02:00:53.567Z The hones yield on analysis 98% of silica, with small proportions of alumina, potash and soda, and mere traces of iron, lime, magnesia and fluorine. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 6 "Home, Daniel" to "Hortensius, Quintus" 2012-03-15T02:00:32.250Z So we know it takes high aluminum content, low silica, lots of heat, mixing, and cooling to cook up a sapphire. The Real Heart of the Ocean 2012-04-14T14:45:05.383Z Said of crystalline rocks which contain a relatively low percentage of silica, as basalt. Webster's Unabridged Dictionary (2nd 100 Pages) 2012-03-24T02:00:19.387Z They’re ribbon chert, formed in a deep ocean environment from the silica skeletons of radiolarians. M lange et Trois: A Trip Across Subduction Zone Madness 2012-03-07T22:15:00.213Z Natural soils consist of substances derived from the decomposition of various kinds of rocks, the bulk consisting of clay, silica and lime, in various proportions. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 7 "Horticulture" to "Hudson Bay" 2012-03-04T03:00:13.390Z Turkey oilstone is a close-grained bluish stone 653 containing from 70 to 75% of silica in a state of very fine division, intimately blended with about 20 to 25% of calcite. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 6 "Home, Daniel" to "Hortensius, Quintus" 2012-03-15T02:00:32.250Z Image and caption credit: Rob Lavinsky, iRocks.com The basic requirements for sapphire formation appear to be magma and country rocks rich in aluminum but poor in silica. The Real Heart of the Ocean 2012-04-14T14:45:05.383Z It has already been stated, that when carbonic acid is passed through a solution of silicate of soda, silica will be precipitated. British Manufacturing Industries Pottery, Glass and Silicates, Furniture and Woodwork. 2012-02-26T03:00:18.883Z Radiolarians are tiny protists that live inside intricate silica shells. Proteus: How Radiolarians Saved Ernst Haeckel 2012-01-31T21:45:07.440Z Pol′ishing-slate, a mineral used for polishing glass, marble, and metals, composed chiefly of silica, with a little alumina, lime, oxide of iron, and water; Pol′ishment. Chambers's Twentieth Century Dictionary (part 3 of 4: N-R) 2012-01-30T03:00:13.887Z But the researchers found that in molten rock that's rich in silica, carbon dioxide is only between one-fourth and one-third as soluble, regardless of the pressure. How a Diamond Is Like a Champagne Cork 2012-01-18T18:00:00Z Limestone and silica quarries are worked, while sandstone and clay are also raised. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 1 "Gichtel, Johann" to "Glory" 2012-01-11T03:00:20.463Z With certain metallic oxides, silica forms coloured silicates or glasses; and these, when fused with colourless glasses, impart to them the colour of the silicate. British Manufacturing Industries Pottery, Glass and Silicates, Furniture and Woodwork. 2012-02-26T03:00:18.883Z The polymer is coated with a substance called fumed silica in differing amounts to determine the optimal coating. New, Reusable Materials Could Pull CO2 Straight from Air 2012-01-06T16:45:00.237Z It was found entwined with a silica mineral that forms only at high pressures and temperatures—such as might be created by a collision with the chondrite body. World's Only Known Natural Quasicrystal Traced to Ancient Meteorite 2012-01-03T21:45:21.237Z By far the most common matrix of vein-gold is quartz or silica, but it is not the only one. The Romance of Industry and Invention 2011-12-19T03:00:43.870Z They impart fusibility to clays and are carefully excluded from fine white bodies.Kaolin.—A fine, white, very pure, and infusible China clay, almost pure alumina and silica. Pottery, for Artists Craftsmen & Teachers 2011-12-10T03:00:15.097Z No doubt, at some future period, some one will discover a method of rendering this condition of silica useful in the arts. British Manufacturing Industries Pottery, Glass and Silicates, Furniture and Woodwork. 2012-02-26T03:00:18.883Z This property was possessed in a remarkable degree by quartz or silica. Heroes of Science Chemists 2011-12-09T03:00:21.047Z Their component particles are usually not much rounded by attrition, and the rocks have often been considerably indurated by pressure and mineral changes, such as the introduction of interstitial silica. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 5 "Greek Law" to "Ground-Squirrel" 2011-12-05T03:00:51.527Z Mr. Olmsted’s report found elevated levels of lead and dust that violated legal limits, as well as mold, crystalline silica and a number of fire code violations. City Room: Tenants at Chelsea Hotel File Suit Against Owner Over Renovations 2011-12-03T19:20:04Z This mineral is pure silica and free from lime, although the sands may contain some small percentage of iron. Pottery, for Artists Craftsmen & Teachers 2011-12-10T03:00:15.097Z At the commencement of this article, it was stated that silicic acid, or silica, could be made soluble in water. British Manufacturing Industries Pottery, Glass and Silicates, Furniture and Woodwork. 2012-02-26T03:00:18.883Z Hence silica was regarded as the typical earth, until Berzelius, in 1815, proved it to be an acid. Heroes of Science Chemists 2011-12-09T03:00:21.047Z The water contained in the sand while consolidation was in progress, held in solution some slight amount of silica, the same material of which the grains of sand themselves are composed. The Geography of the Region about Devils Lake and the Dalles of the Wisconsin 2011-11-29T03:00:17.347Z But in course of time the action of percolating water assisted by pressure tends to convert gravels into firm masses of conglomerate by depositing carbonate of lime, silica and other substances in their interstices. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 4 "Grasshopper" to "Greek Language" 2011-11-28T03:00:19.517Z It is used to replace more refractory materials in clay and to stiffen glazes.Flint.—A pure silica with slight traces of calcium. Pottery, for Artists Craftsmen & Teachers 2011-12-10T03:00:15.097Z The scientific name for sand, or more properly for its principal constituent, is silica. British Manufacturing Industries Pottery, Glass and Silicates, Furniture and Woodwork. 2012-02-26T03:00:18.883Z The supposition of the acid character of silica was amply confirmed by the mineralogical analyses and experiments of Berzelius. Heroes of Science Chemists 2011-12-09T03:00:21.047Z Little by little this silica in solution was deposited on the surfaces of the sand grains, enlarging them, and at the same time binding them together. The Geography of the Region about Devils Lake and the Dalles of the Wisconsin 2011-11-29T03:00:17.347Z Aluminium and oxygen form alumina, of which are constituted the sapphire, the ruby and other precious stones, but alumina is most commonly found in combination with silica, or silicon and oxygen. Marvels of Scientific Invention An Interesting Account in Non-technical Language of the Invention of Guns, Torpedoes, Submarine Mines, Up-to-date Smelting, Freezing, Colour Photography, and many other recent Discoveries of Science 2011-11-19T03:00:24.517Z These supply the alumina, silica, lime, potash, and soda, with traces of iron and magnesia, that are found in all clays when analyzed. Pottery, for Artists Craftsmen & Teachers 2011-12-10T03:00:15.097Z Coloured Glasses.—It has been before shown that silica unites with metallic oxides; in fact, glass is nothing but a compound brought about by the union. British Manufacturing Industries Pottery, Glass and Silicates, Furniture and Woodwork. 2012-02-26T03:00:18.883Z During this process the animal matter of bones or other objects would disappear and its place be taken by lime or silica, and thus would be formed a layer of rock containing fossils. Animals of the Past 2011-11-16T03:00:27.497Z The alumina or silica at high temperatures decomposes the salt, setting free hydrochloric acid and probably also free chlorine. De Re Metallica, Translated from the First Latin Edition of 1556 2011-11-16T03:00:21.977Z The aplites, pegmatites, graphic granites and muscovite granites are usually richest in silica, while with increase of biotite and hornblende, augite and enstatite the analyses show the presence of more magnesia, iron and lime. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 3 "Gordon, Lord George" to "Grasses" 2011-11-13T03:00:13.177Z This mass is easily fusible when lead or borax is present in large proportions, more infusible or harder the more silica it contains, and very refractory if alumina is present in any quantity. Pottery, for Artists Craftsmen & Teachers 2011-12-10T03:00:15.097Z This white flocculent substance is silicic acid combined with the elements of water, and is therefore called by chemists hydrate of silica. British Manufacturing Industries Pottery, Glass and Silicates, Furniture and Woodwork. 2012-02-26T03:00:18.883Z The genesis of the last three types of deposit is generally assigned to the simultaneous percolation of solutions of gold and silica, the auriferous solution being formed during the disintegration of the gold-bearing metalliferous veins. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 2 "Gloss" to "Gordon, Charles George" 2011-10-31T02:00:28.703Z They would be strange mixtures of sodium, potassium, aluminium sulphates, with silica, brickdust, asbestos, and various proportions of undigested vitriol, salt, saltpetre, alum, iron oxides, etc. De Re Metallica, Translated from the First Latin Edition of 1556 2011-11-16T03:00:21.977Z Tabasheer is a white substance mainly composed of silica, found in the joints of several bamboos. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 3 "Gordon, Lord George" to "Grasses" 2011-11-13T03:00:13.177Z They are used to replace some of the silica, than which they are more fusible. Pottery, for Artists Craftsmen & Teachers 2011-12-10T03:00:15.097Z It has already been mentioned that when silica or sand is fused with an excess of alkali, the resulting glass is soluble in water. British Manufacturing Industries Pottery, Glass and Silicates, Furniture and Woodwork. 2012-02-26T03:00:18.883Z The salts of potassa, magnesia, and iron, of manganese, silica, and fluorine, are always present, and perform services of greater or less obvious moment in the animal economy. Martyria or Andersonville Prison 2011-10-22T02:00:28.563Z Certain factors are essential besides salt: a, the admission of air, which is possible through the porous pots used; b, the presence of some moisture to furnish hydrogen; c, the addition of alumina or silica. De Re Metallica, Translated from the First Latin Edition of 1556 2011-11-16T03:00:21.977Z A soft, unctuous form results on treating carbon with ash or silica in special furnaces, and this gives the so-called “deflocculated” variety when treated with gallotannic acid. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 3 "Gordon, Lord George" to "Grasses" 2011-11-13T03:00:13.177Z With low-firing natural clays rich in silica and iron, the craze is not of much consequence. Pottery, for Artists Craftsmen & Teachers 2011-12-10T03:00:15.097Z Alumina is a light material—silica a heavy one; and a potter ought to know approximatively in testing the density of a sample, whether it is rich or poor in either of the two. British Manufacturing Industries Pottery, Glass and Silicates, Furniture and Woodwork. 2012-02-26T03:00:18.883Z The company is also exploring options for using the process's waste silica—more commonly known as sand—in the cement industry. Geothermal Power Plants Could Help Produce Lithium for Electric Cars 2011-09-29T18:45:05.100Z Thus, silica and alumina are combined to form the aluminous silicates, which enter so largely into the composition of the crust of the earth. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6 "Geodesy" to "Geometry" 2011-09-19T02:00:10.473Z Magnesium silicate, aluminum silicate, and silica are three inert pigments which proved to be of great value in strengthening and reinforcing paints, especially when they were used in small percentage. Paint Technology and Tests 2011-09-15T02:00:12.263Z The substitution of borax for a portion of the silica can also be tried and will permit the use of slightly lower firing point. Pottery, for Artists Craftsmen & Teachers 2011-12-10T03:00:15.097Z It is a common error to say, that it is the silica which renders them refractory. British Manufacturing Industries Pottery, Glass and Silicates, Furniture and Woodwork. 2012-02-26T03:00:18.883Z The fusion bath is so arranged that only red-coloured alumina shall crystallize out, but it is difficult to have all the materials of such purity as to ensure the complete absence of silica and magnesia. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 5 "Gassendi, Pierre" to "Geocentric" 2011-09-02T02:00:20.450Z But they also include highly basic varieties wherein the proportion of silica sinks to 40%, and where magnesia greatly predominates over alumina. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6 "Geodesy" to "Geometry" 2011-09-19T02:00:10.473Z Barium sulphate, silica, asbestine, china clay, and calcium carbonate are the standard crystalline pigments. Paint Technology and Tests 2011-09-15T02:00:12.263Z A mixture of egg silica or water glass with fine grog and quartz sand will stop small cracks. Pottery, for Artists Craftsmen & Teachers 2011-12-10T03:00:15.097Z It is necessary, for a proper understanding of the scientific part of our subject, that this fact should be borne in mind, and that the acid properties of silica should be thoroughly recognized. British Manufacturing Industries Pottery, Glass and Silicates, Furniture and Woodwork. 2012-02-26T03:00:18.883Z When all the magnesia and silica have been eliminated in this way the bath resumes its deposition of crystalline ruby. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 5 "Gassendi, Pierre" to "Geocentric" 2011-09-02T02:00:20.450Z For the most part they consist mainly of aluminous silicates, some of them being highly acid compounds with 75% or more of silica. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6 "Geodesy" to "Geometry" 2011-09-19T02:00:10.473Z They generally contain 95% or more of iron oxide, with varying percentages of silica. Paint Technology and Tests 2011-09-15T02:00:12.263Z The silica forming the glassy part of the glaze is stiffened by the presence of alumina, which stops any tendency to run. Pottery, for Artists Craftsmen & Teachers 2011-12-10T03:00:15.097Z Here then, silicate of lime is obtained by a process very different from that which has already been described, namely, by the heating of lime with silica at a high temperature. British Manufacturing Industries Pottery, Glass and Silicates, Furniture and Woodwork. 2012-02-26T03:00:18.883Z The Oriental Emerald.—The stone known as emerald consists chemically of silica, alumina and glucina. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 5 "Gassendi, Pierre" to "Geocentric" 2011-09-02T02:00:20.450Z They have low silica, much iron and magnesia, and the abundance of lime distinguishes them in a marked fashion from both the granites and the peridotites. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" 2011-08-24T02:00:20.690Z It contains a high percentage of alumina and silica, and has a characteristic brown color with a gravity of 3.1. Paint Technology and Tests 2011-09-15T02:00:12.263Z Combined with silica it is the chief constituent of kaolins and China clays. Pottery, for Artists Craftsmen & Teachers 2011-12-10T03:00:15.097Z In very complicated mixtures, such as acid lavas or slags containing a large proportion of silica, amorphous and crystalline solidification may occur together. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" 2011-08-15T02:00:28.473Z Chemically the topaz consists of alumina, silica and fluorine. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 5 "Gassendi, Pierre" to "Geocentric" 2011-09-02T02:00:20.450Z These rocks are rich with silica, and their origins are still unknown. Observatory: Rocky Surprises on the Dark Side of the Moon 2011-07-25T18:03:42Z This bright blue pigment is prepared by burning silica, china clay, soda ash and sulphur in pots or furnaces. Paint Technology and Tests 2011-09-15T02:00:12.263Z The paste of which they are made is very fine and homogeneous, coated with a peculiar glassy lustre, which is thin but tenacious, red or black, and formed of silica rendered fusible by an alkali. Triumphs of Invention and Discovery in Art and Science 2011-07-19T02:00:21.280Z Minerals like felspar and mica are fused more readily than quartz, but analysis shows that some fulgurite glasses are very rich in silica, which perhaps was dissolved in the glass rather than simply fused. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" 2011-08-15T02:00:28.473Z It is a compound of silica and zirconia. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 5 "Gassendi, Pierre" to "Geocentric" 2011-09-02T02:00:20.450Z The clay beds are similar to those which cover most of the northern islands, and contain silica, alumina, magnesia, and iron, but usually no lime, except in the form of gypsum, found in crevices. In the Andamans and Nicobars The Narrative of a Cruise in the Schooner "Terrapin" 2011-06-30T02:00:24.487Z The checking of paints very high in silica resolved itself into fine hair-like lines which are generally lateral to each other, and indicate a cracked appearance. Paint Technology and Tests 2011-09-15T02:00:12.263Z The thin film of glass is then etched to create silica disks supported underneath by silicon pillars. Tiny Ring Laser Detects and Counts Nanoparticles 2011-06-29T14:12:00Z Typical cases of amorphous solidification are those of silica, glass, plastic sulphur, pitch, alcohol and many organic liquids. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" 2011-08-15T02:00:28.473Z Under the influence of the high temperature the silica of the crucible gradually decomposes the lead aluminate, forming lead silicate, which remains in the liquid state, and alumina, which crystallizes as white sapphire. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 5 "Gassendi, Pierre" to "Geocentric" 2011-09-02T02:00:20.450Z The walls of these spaces are said in some cases to contain a considerable amount of silica. Freshwater Sponges, Hydroids & Polyzoa 2011-06-25T02:00:17.833Z In this case we may imagine the wood to have been acted on by water holding in solution silica, combined with soda or potash, in the manner of what is termed soluble glass. The Chain of Life in Geological Time A Sketch of the Origin and Succession of Animals and Plants 2011-06-01T02:00:24.880Z One of those discoveries was a material called amorphous silica, which scientists believe formed in an ancient hydrothermal system. NASA to Abandon Mars Spirit Rover 2011-05-25T00:18:20Z Siloxicon, a compound of carbon, silicon and oxygen, formed from carbon and silica in the electric furnace, was patented by E.G. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" 2011-08-15T02:00:28.473Z The Armed Forces Institute of Pathology ran a third set of tests and found pockets of heavy silica concentrations, but it couldn't say whether they were inside or outside the spores. FBI lab reports on anthrax attacks suggest another miscue 2011-05-20T05:16:10Z Its epidermis had thick outer walls, a well-developed cuticle and silica deposits, and its stomata were situated well below the stem surface and were protected by cover-cells and silica deposits. Newly Discovered Plant Fossil Reveals More Than Age 2011-05-06T16:37:00Z The wood, in decay, would be converted into carbon dioxide, and this as formed would seize on the potash or soda, leaving the silica in an insoluble state, to be deposited instead of the carbon. The Chain of Life in Geological Time A Sketch of the Origin and Succession of Animals and Plants 2011-06-01T02:00:24.880Z The deep-sea species below a certain depth cannot possess a calcareous shell, for this would be dissolved; and it is in these that we find limesalts sometimes replaced by silica. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 6 "Foraminifera" to "Fox, Edward" 2011-04-22T02:00:08.637Z The latter, especially when brought to the burning point at a high temperature, produces a heat that can be resisted by the most refractory substances only, such as silica, alumina and magnesia. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" 2011-08-15T02:00:28.473Z Jacobsen, the Texas chemist, suspects that the silica pockets represented excess material that went through a chemical reaction and hardened before it could penetrate the spores. FBI lab reports on anthrax attacks suggest another miscue 2011-05-20T05:16:10Z "The silica deposits of hint at a physiological mechanism of stress tolerance," adds Channing, "as silicon uptake has been demonstrated to ameliorate salt, heat, and heavy metal stresses in living crop plants." Newly Discovered Plant Fossil Reveals More Than Age 2011-05-06T16:37:00Z |
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