| 单词 | calcium carbonate |
| 例句 | “Oh, stuff like magnesium salts, and alcohol for keeping the Deltas and Epsilons small and backward, and calcium carbonate for bones, and all that sort of thing.” Brave New World 1932-01-01T00:00:00Z “Yeah. See? The granules are perfectly round. It’s not really sand. It’s calcium carbonate.” The Mark of Athena 2012-10-02T00:00:00Z This involved scraping a few milligrams of calcium carbonate deposit from the paintings for analysis. Primitive art: Neanderthals were Europe's first painters 2018-02-22T05:00:00Z Fantastic natural hot-springs site where mineral pools spread calcium carbonate on rocky cliffs, turning it into what looks like puffy cotton — and transmuting it into elegant travertine limestone. Take a budget-friendly bus tour of Turkey 2015-05-01T04:00:00Z This involved scraping a few milligrams of calcium carbonate deposit from the paintings for analysis. Primitive art: Neanderthals were Europe's first painters 2018-02-22T05:00:00Z Corals are tiny soft creatures that survive on plankton and photosynthesis, and secrete calcium carbonate. Bonaire: Where Coral and Cactus Thrive, and the Sea Soothes the Soul 2019-02-18T05:00:00Z The shells also contain calcium carbonate, the key ingredient in garden lime. Why you should prepare a seafood dinner for your soil 2016-03-21T04:00:00Z By controlling the contents of this fluid, the corals can encourage the minerals to crystallize into calcium carbonate. ‘Why can’t you make a coral out of an anemone?’ 2023-10-24T04:00:00Z The protection will help the rare wildflowers bloom on soil with calcium carbonate, a substance found in toothpaste, cement, medicines and other products. Under a temporary mining ban, 4 rare plant species can bloom in San Bernardino forest 2023-10-20T04:00:00Z The shells from its final meal are made of calcium carbonate, which dissolves in acidic conditions, so the researchers think the animal’s gut had a neutral or alkaline pH. Scientists reveal half-billion-year-old ‘last supper’ 2023-09-27T04:00:00Z Carbonate usually breaks down quickly, but if these plant-microbe systems are grown in alkaline- and calcium-rich soils, the carbonate reacts with calcium to form stable deposits of calcium carbonate. We could sequester CO2 by 're-greening' arid lands, plant scientists say 2023-09-21T04:00:00Z Their hard shells, made of calcium carbonate, can withstand the test of time and their fossils reveal a lot about Earth's history, including past climates and environments. Researchers discover a new species of larger benthic foraminifer from the Ryukyu Islands 2023-09-19T04:00:00Z Vinegar, an acid, dissolves bits of a material called calcium carbonate in the limestone. Rock On - Fizzy Fun Science Experiment 2014-12-15T05:00:00Z The soft-bodied polyp forms a hard outer shell by extracting calcium carbonate from the sea. Robots are trained to help revive coral reefs 2023-09-11T04:00:00Z It could also profit by selling calcium carbonate to the local building industry, he added. Singapore to expand ocean CO2 removal project as scientists call for more research 2023-09-05T04:00:00Z Seashells are simply calcium carbonate, and the material has a hardness of only 3 on the Mohs hardness scale. How much do you know about sandpaper? 2023-08-28T04:00:00Z They use calcium carbonate and other minerals from the surrounding seawater to build their wing-shaped shells layer by layer as they grow. Barnacles could help solve the mystery of Malaysian Airlines Flight 370 2023-08-23T04:00:00Z The result of this symbiotic relationship is the coral’s ability to build a calcium carbonate skeleton and reefs that support nearly 25% of all marine life. A Heroic Effort Aims to Save Florida’s Coral Reefs from Record Heat 2023-08-20T04:00:00Z Mono is a million years old, one of North America’s oldest lakes, a sci-fi landscape of calcium carbonate tufa towers, more than twice as salty as the sea itself, and eerie-looking empty or full. Cities’ thirst nearly killed these California lakes. Not so fast, said our epic wet winter 2023-07-25T04:00:00Z At the plant, seawater is run through an electrolyser, which converts dissolved CO2 into calcium carbonate and produces hydrogen. Singapore to expand ocean CO2 removal project as scientists call for more research 2023-09-05T04:00:00Z “It is essential that the medium of my work be ceramic, as calcium carbonate happens to be both a glaze ingredient and the compound precipitated by corals to sculpt their stony structures,” Mattison said. How pop culture and climate anxiety have galvanized a new generation of clay artists 2023-07-20T04:00:00Z The seawater is then returned to the ocean and can pull more carbon dioxide out of the air, while the solid mineral, which contains calcium carbonate, can then settle to the sea floor. Boeing signs alternative fuel deal with Los Angeles startup to cut carbon footprint 2023-06-01T04:00:00Z Parts of shark skeleton are strengthened by granules of calcium carbonate, but this is not the same as bone. Fundamentals of Biology 2015-01-01T00:00:00Z The animals that create coral reefs do so over thousands of years, continuing to slowly deposit the calcium carbonate that forms their characteristic ocean homes. Concepts of Biology 2013-04-25T00:00:00Z This forms calcium carbonate, which becomes embedded in the concrete. NYC skyscrapers turning to carbon capture to lessen climate change 2023-05-14T04:00:00Z That then sets off a series of chemical reactions that trap the greenhouse gas into a solid mineral that includes calcium carbonate — the same thing seashells are made of. California researchers attempt ocean climate solution 2023-04-20T04:00:00Z How it works: Deposits containing calcium carbonate, such as limestone or chalk, are mined from quarries, which may include small amounts of clay containing silicon, aluminum or iron. Solving Cement’s Massive Carbon Problem 2023-02-09T05:00:00Z As a group, the forams exhibit porous shells, called tests that are built from various organic materials and typically hardened with calcium carbonate. Fundamentals of Biology 2015-01-01T00:00:00Z Most non-avian reptiles and insects produce leathery eggs, while birds and some turtles produce eggs with high concentrations of calcium carbonate in the shell, making them hard. Concepts of Biology 2013-04-25T00:00:00Z Hot mixing took place because lime clasts — white minerals that are roughly a millimeter in size and created by extreme heat — turn into calcium carbonate when they come into contact with water. Ancient Roman architecture made with self-healing concrete, study finds 2023-01-08T05:00:00Z The CO2 reacts with the calcium in the mixture to form calcium carbonate, a mineral that the company says adds strength to the concrete as well as locking in carbon. How to Construct Buildings That Have a Positive Impact on Climate and Biodiversity 2022-12-22T05:00:00Z Acidification could weaken quaggas’ calcium carbonate shells, as it has with ocean mussels and clams. Scientists: Atmospheric carbon might turn lakes more acidic 2022-12-19T05:00:00Z 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 mantle may or may not secrete a shell of calcium carbonate. Concepts of Biology 2013-04-25T00:00:00Z The hard cell walls of the algae contain calcium carbonate, Prof Cordeiro points out, thus helping to remove carbon from the atmosphere for an indefinite period. The Amazon reef that may be threatened by oil drilling 2022-12-17T05:00:00Z Elsewhere, high acidity eats away at the calcium carbonate that makes shells. Fish farming in WA goes back millennia — how will it survive? 2022-11-28T05:00:00Z By comparison, the shell of a modern mollusk, made of calcium carbonate, cracks easily beneath a beachcomber’s feet. The Sad Fate of the Ancient, Well-Shelled Mariners 2022-11-04T04:00:00Z The exoskeletons of many species are also infused with calcium carbonate, which makes them even stronger than in other arthropods. Fundamentals of Biology 2015-01-01T00:00:00Z The polyps secrete the calcium carbonate that builds coral reefs. Concepts of Biology 2013-04-25T00:00:00Z As invertebrates, corals secrete calcium carbonate to build up their protective skeletons, where algae take up residence, giving the corals brilliant colour while providing the coral with energy. In COP27 host Egypt, Red Sea coral reefs resilient but under stress 2022-10-27T04:00:00Z This compound can be prepared by the reaction of calcium carbonate, CaCO3, with propionic acid, C2H5CO2H, which has properties similar to those of acetic acid. Chemistry 2019-02-14T00:00:00Z Embedded in this gelatin are calcium carbonate crystals—like tiny rocks. Biology for AP Courses 2022-06-09T00:00:00Z The shells of bird eggs are composed of calcium carbonate and are hard, but fragile. Fundamentals of Biology 2015-01-01T00:00:00Z The shells of bird eggs are composed of calcium carbonate and are hard and brittle, but possess pores for gas and water exchange. Concepts of Biology 2013-04-25T00:00:00Z One effect: A mineral called calcium carbonate — an essential building block for many sea creatures — becomes less available. To protect the ocean, some ships harness renewable energy 2022-08-18T04:00:00Z It is important to realize that this equilibrium is established in any aqueous solution containing Ca2+ and CO32– ions, not just in a solution formed by saturating water with calcium carbonate. Chemistry 2019-02-14T00:00:00Z The utricle and saccule measure head orientation: their calcium carbonate crystals shift when the head is tilted, thereby activating hair cells. Biology for AP Courses 2022-06-09T00:00:00Z Many of the creatures evolved hard body parts such as calcium carbonate shells during this time. ‘Earliest animal predator’ named after David Attenborough 2022-07-25T04:00:00Z The exoskeleton of many species is also infused with calcium carbonate, which makes it even stronger than in other arthropods. Concepts of Biology 2013-04-25T00:00:00Z The pale fringes surrounding the water that remains are places where water left behind calcium carbonate and other minerals — showing where the high mark used to be. What record-low water levels at the Hoover Dam reservoir look like from space 2022-07-22T04:00:00Z Inspection of these equilibria shows the carbonate ion is involved in the calcium carbonate dissolution and the acid hydrolysis of bicarbonate ion. Chemistry 2019-02-14T00:00:00Z Reptiles and insects produce leathery eggs, while birds and turtles produce eggs with high concentrations of calcium carbonate in the shell, making them hard. Biology for AP Courses 2022-06-09T00:00:00Z As ocean acidification increases, the availability of calcium carbonate will decline. Environmental Biology 2018-09-06T00:00:00Z Parts of the shark skeleton are strengthened by granules of calcium carbonate, but this is not the same as bone. Concepts of Biology 2013-04-25T00:00:00Z The chemical sedimentary rock limestone is made of calcium carbonate. An Introduction to Geology 2017-01-01T00:00:00Z The equilibrium constant for this net reaction is much greater than the Ksp for calcium carbonate, indicating its solubility is markedly increased in acidic solutions. Chemistry 2019-02-14T00:00:00Z Due to rising temperature the hard calcium carbonate skeleton of coral reefs is destroyed due to a process called bleaching. Biology for AP Courses 2022-06-09T00:00:00Z As acidity increases, it interferes with the calcification that normally occurs as coral animals build their calcium carbonate homes. Environmental Biology 2018-09-06T00:00:00Z These salt crystals form when calcium phosphate and calcium carbonate combine to create hydroxyapatite, which incorporates other inorganic salts like magnesium hydroxide, fluoride, and sulfate as it crystallizes, or calcifies, on the collagen fibers. Anatomy and Physiology 2013-06-19T00:00:00Z Saline lakes concentrate calcium carbonate from a combination of wave action causing degassing, springs in the lakebed, and evaporation. An Introduction to Geology 2017-01-01T00:00:00Z Pearls and the shells of most mollusks are calcium carbonate. Chemistry 2019-02-14T00:00:00Z Corals are able to accumulate calcium carbonate from the algae. Biology for AP Courses 2022-06-09T00:00:00Z The animals that create coral reefs have evolved over millions of years, continuing to slowly deposit the calcium carbonate that forms their characteristic ocean homes. Environmental Biology 2018-09-06T00:00:00Z A natural process turns the carbon dioxide into calcium carbonate crystals. There’s a carbon-capture gold rush. Some warn better solutions exist. 2022-06-23T04:00:00Z When carbon dioxide gets absorbed in the ocean, it creates carbonic acid which makes the ocean more acidic which has an impact on marine organisms that secrete calcium carbonate shells. An Introduction to Geology 2017-01-01T00:00:00Z The two carbonates used commercially in the largest quantities are sodium carbonate and calcium carbonate. Chemistry 2019-02-14T00:00:00Z A dig in a farmland soil rich in calcium carbonate reveals the following findings: 1. Biology for AP Courses 2022-06-09T00:00:00Z Over geologic time, the calcium carbonate forms limestone, which comprises the largest carbon reservoir on Earth. Environmental Biology 2018-09-06T00:00:00Z Even some corals have found ways to keep their calcium carbonate skeletons from eroding in more acidic waters. Ocean animals face a mass extinction from climate change, study finds 2022-04-28T04:00:00Z Recall that hydrochloric acid reacts by effervescing with limestone rock made of calcite, which is calcium carbonate. An Introduction to Geology 2017-01-01T00:00:00Z In a polluted atmosphere where the concentration of sulfur dioxide is high, calcium carbonate deteriorates more rapidly than in less polluted air. Chemistry 2019-02-14T00:00:00Z As the tough and resistant outer cover of an arthropod, the exoskeleton may be constructed of a tough polymer such as chitin and is often biomineralized with materials such as calcium carbonate. Biology for AP Courses 2022-06-09T00:00:00Z The winning company seeks to trap atmospheric carbon dioxide in calcium carbonate crystals, similar to how the gas dissolved in the ocean helps form seashells and limestone. Algae a winner in Elon Musk-funded greenhouse gas contest 2022-04-22T04:00:00Z A: The calcium carbonate you take is intended for short-term symptomatic relief. What happened to the flu this year? 2022-02-23T05:00:00Z The calcium carbonate nurtured their growth, even during a relatively cold period on the island. This tree has stood here for 500 years. Will it be sold for $17,500? Solid calcium carbonate is heated and decomposes to solid calcium oxide and carbon dioxide gas. Chemistry 2019-02-14T00:00:00Z The exoskeleton is further strengthened by the addition of calcium carbonate in organisms such as the lobster. Biology for AP Courses 2022-06-09T00:00:00Z What most people think of as a coral is actually many tiny colonial polyps that build calcium carbonate skeletons. Coral reef scientists raise alarm as climate change decimates vital ocean ecosystems 2021-07-24T04:00:00Z Through further refinement, the liquid is turned into calcium carbonate pellets. Climate change: Large-scale CO2 removal facility set for Scotland 2021-06-24T04:00:00Z In return for being allowed to live in the corals' hard, calcium carbonate exoskeleton, the algae help produce food for their hosts. Then and now: Rising temperatures threaten corals 2021-04-01T04:00:00Z The first step is the decomposition of solid calcium carbonate from seashells to form solid calcium oxide and gaseous carbon dioxide. Chemistry 2019-02-14T00:00:00Z She describes some of the ideas that have been floated, including spraying particles of sulfur, or calcium carbonate, or even finely milled diamonds, into the atmosphere. The unintended consequences of taming nature 2021-03-21T04:00:00Z A. Tums are a good source of calcium in the form of calcium carbonate. Reader question: Why wear a face mask after you get COVID-19 vaccine? 2020-12-31T05:00:00Z If it works, then a following test would use the propellers to slowly scatter and mix a small amount of calcium carbonate, a common form of mineral dust, into the atmosphere. Pandemic Leads Geoengineering Experiment to Move from U.S. to Sweden 2020-12-17T05:00:00Z Much more about the downstream reactions of the altered calcium carbonate should be studied in the lab without any atmospheric release, he adds. Geoengineers set date for Sun-dimming balloon test 2020-12-15T05:00:00Z Stalactites and stalagmites, like those shown in Figure 18.30, form in caves when drops of water containing dissolved calcium hydrogen carbonate evaporate to leave a deposit of calcium carbonate. Chemistry 2019-02-14T00:00:00Z Of the thick grayish mass that emerges, four ingredients are known: calcium carbonate, clay, glue and oyster shells. A Ride on the Assembly Line With the World’s Most Famous Chalk 2020-11-17T05:00:00Z The engineers involved say the impact is achieved by adding different-sized particles of calcium carbonate. Climate change: 'Cooling paint' could cut emissions from buildings 2020-10-21T04:00:00Z This would involve combining low concentrations of CO2 with calcium to produce calcium carbonate, or limestone. Perspective | Stopping climate change could cost less than fighting covid-19 2020-09-17T04:00:00Z After much investigation, the team settled on using calcium carbonate—chalk, essentially—as an ideal light-blocking particle. Geoengineers set date for Sun-dimming balloon test 2020-12-15T05:00:00Z When 100 grams of solid calcium carbonate is heated, 44 grams of carbon dioxide and 56 grams of calcium oxide are produced. Chemistry 2019-02-14T00:00:00Z They found that sediments deposited immediately after the impact were rich in micrite, a calcium carbonate mineral. After an asteroid wiped out the dinosaurs, ocean microbes helped life rebound 2020-09-15T04:00:00Z Corals grow through a symbiotic relationship between animal coral polyps that build the hard calcium carbonate skeletons of the reefs and single-celled organisms that survive via photosynthesis and feed the polyps nutrients. Australia Floats Plan to Better Protect Great Barrier Reef 2020-08-25T04:00:00Z Because hard-shelled, calcareous eggs, like those of birds, are reinforced by crystalline calcium carbonate, they are well represented in the fossil record. Hard evidence from soft fossil eggs 2020-06-16T04:00:00Z Unlike sulfates, which can lead to ozone loss, calcium carbonate is not particularly reactive. Geoengineers set date for Sun-dimming balloon test 2020-12-15T05:00:00Z Calcium oxide, CaO, is made by heating calcium carbonate, CaCO3, which is widely and inexpensively available as limestone or oyster shells: Chemistry 2019-02-14T00:00:00Z The microcrystals are remarkably similar to the calcium carbonate produced by modern-day bacteria, and so most of the micrite is likely biological in origin, Bralower and his colleagues report in Earth and Planetary Science Letters. After an asteroid wiped out the dinosaurs, ocean microbes helped life rebound 2020-09-15T04:00:00Z This biomolecular bounty is then transformed by the corals into proteins, fats, carbohydrates and a calcium carbonate skeleton. Model system might reveal how coral cells take up and evict algae 2020-06-16T04:00:00Z The orange globules at their center seemed to contain a mixture of iron, magnesium, and calcium carbonate. We may have found life on Mars 24 years ago 2020-06-13T04:00:00Z This lab work, however, only scratches the barest surface of how calcium carbonate will behave in the stratosphere, says Daniel Cziczo, an atmospheric chemist at Purdue University who is skeptical of SCoPEx. Geoengineers set date for Sun-dimming balloon test 2020-12-15T05:00:00Z Eggshells are made almost entirely of calcium carbonate, which our bodies need for healthy bones and muscles. Supercharge your plants with leftover eggshells by brewing 'shell tea' 2020-05-13T04:00:00Z The microbes eagerly absorbed light and began producing calcium carbonate, gradually cementing the sand particles together. Bricks Alive! Scientists Create Living Concrete 2020-01-27T05:00:00Z It would ascend to a height of 12 miles over New Mexico and then release less than 2.2 pounds of calcium carbonate. U.S. geoengineering research gets a lift with $4 million from Congress 2020-01-23T05:00:00Z The Synechococcus seeded calcium carbonate throughout this structure, turning soft goo into a harder mineralized substance that held the sand in place. Bacteria-Filled Bricks Build Themselves 2020-01-15T05:00:00Z The mix provided structural support to the bacteria, which—as they grew—lay down calcium carbonate, similar to the way some ocean creatures create shells. ‘Frankenstein’ material can self-heal, reproduce 2020-01-15T05:00:00Z The first involves calcium, which, in the form of calcium carbonate, is a building block that helps create their protective shells. Waters Off California Acidifying Faster Than Rest of Oceans, Study Shows 2019-12-16T05:00:00Z These single-celled organisms surround themselves with hard shells of calcium carbonate. Did a million years of rain jump-start dinosaur evolution? 2019-12-02T05:00:00Z Carbon pollution heats up the ocean and turns it more acidic, making it difficult for the delicate creatures to build their calcium carbonate skeletons. These corals could survive climate change — and help save the world’s reefs 2019-11-26T05:00:00Z There, the ions are taken up as calcium carbonate by shell-forming marine organisms. A massive experiment in Taiwan aims to reveal landslides’ surprising effect on the climate 2019-11-20T05:00:00Z Lime is “basically” what it sounds like: pulverized limestone rock, also known as calcium carbonate. Boost your pH IQ, and then test — and amend — your soil 2019-11-09T05:00:00Z Your husband is correct that eggshells are a good source of calcium carbonate, according to at least one random health website. Judge John Hodgman on Eating Unpeeled Eggs 2019-10-31T04:00:00Z It is an otolith, a bit of calcium carbonate that sits within the inner ear and acts like an internal gyroscope, helping the fish orient its movements. How a salmon scientist got hooked into a battle over the world’s largest gold mine 2019-09-26T04:00:00Z The project would involve releasing calcium carbonate particles from a steerable balloon some 20 kilometres above the southwestern United States. Daily briefing: Out of date before it’s published 2019-07-30T04:00:00Z But early research indicates that calcium carbonate, a common mineral dust, might actually help restore the ozone layer while reflecting some sunlight back into space. Risks of Controversial Geoengineering Approach "May Be Overstated" 2019-07-03T04:00:00Z "The mounds consist of both dead skeletons - calcium carbonate - and live." Atlantic Ocean 'running out of breath' 2019-06-17T04:00:00Z They then get "entombed" by rock and coated with calcium carbonate crystals in what looks like layers of pasta. Life on Mars? 'Fettuccine' rocks could be 'obvious sign of life' 2019-06-05T04:00:00Z Like the French baguette, the list of ingredients for a true tortilla is short: corn, water and lime or calcium carbonate. 'Tortilla movement' seeks to restore Mexico's iconic food 2019-05-20T04:00:00Z There, a combination of crushing pressures, low temperature, and higher acidity causes the calcium carbonate in their exoskeletons to dissolve, making them vulnerable to pressure and predators. This shrimplike creature makes aluminum armor to survive the deep sea’s crushing pressure 2019-04-30T04:00:00Z The carbonate solution is converted into small, dry pellets of calcium carbonate. Blamed for Climate Change, Oil Companies Invest in Carbon Removal 2019-04-07T04:00:00Z That is then treated with a slurry of calcium hydroxide to change it into solid form; the slurry helps form tiny pellets of calcium carbonate. Climate change 'magic bullet' gets boost 2019-04-03T04:00:00Z The sea's absorption of carbon dioxide lowers the pH of seawater, making it corrosive to the calcium carbonate shells that corals and many other marine creatures build. Researchers embrace a radical idea: engineering coral to cope with climate change 2019-03-21T04:00:00Z Specifically, half of the mice used in the study lacked “otoliths,” small calcium carbonate–based particles that bob around two compartments of the inner ear and allow mammals to perceive vertical and horizontal acceleration. Why Rocking to Sleep Is a Matchless Sedative--and Elixir 2019-01-24T05:00:00Z The aluminum armor appears to both relieve stress from deep-sea pressures and prevent the amphipod exoskeletons from leaching calcium carbonate and disintegrating. This shrimplike creature makes aluminum armor to survive the deep sea’s crushing pressure 2019-04-30T04:00:00Z The carbonate solution is converted into small, dry pellets of calcium carbonate. Blamed for Climate Change, Oil Companies Invest in Carbon Removal 2019-04-07T04:00:00Z The chalky calcium carbonate pellets are then treated at a high temperature of about 900C, with the pellets decomposing into a CO2 stream and calcium oxide. Climate change 'magic bullet' gets boost 2019-04-03T04:00:00Z Coral reefs are vast colonies of hard coral, a type of coral that extracts calcium carbonate from seawater to construct a limestone structure for protection. Scientists Find Some Hope for Coral Reefs: The Strong May Survive 2018-12-10T05:00:00Z The plan is to study tiny 100-gram plumes of calcium carbonate — equivalent to the amount found in an average bottle of antacid — released from a balloon around 20 kilometres up. Daily briefing: This principle has enabled scientists to speak truth to power for 100 years 2018-11-26T05:00:00Z Zhen Dai holds up a small glass tube coated with a white powder: calcium carbonate, a ubiquitous compound used in everything from paper and cement to toothpaste and cake mixes. First sun-dimming experiment will test a way to cool Earth 2018-11-26T05:00:00Z The carbonate solution is converted into small, dry pellets of calcium carbonate. Blamed for Climate Change, Oil Companies Invest in Carbon Removal 2019-04-07T04:00:00Z The enzyme breaks down the urea in urine, while producing the rocky substance calcium carbonate through a complex chemical reaction. South Africans make bricks from human urine 2018-11-02T04:00:00Z The bacteria produces an enzyme that breaks down urea in the urine, forming calcium carbonate, which then binds the sand into rock hard, grey bricks. Human urine bricks made in South Africa 2018-10-25T04:00:00Z Urease breaks down the urea in the urine, producing calcium carbonate, which cements the sand into shape. 'Liquid gold': students make world's first brick out of human urine 2018-10-25T04:00:00Z Once in place, the experiment would release small plumes of calcium carbonate, each of around 100 grams, roughly equivalent to the amount found in an average bottle of off-the-shelf antacid. First sun-dimming experiment will test a way to cool Earth 2018-11-26T05:00:00Z At the Smithsonian, she studied calcium carbonate and mineral structures and began experimenting with X-rays of seashells and deep-sea coral that would eventually become the focus of her mandala series and the “Shoreline Project.” Elizabeth Turk's illuminating social sculpture will light up a beach with 1,000 glowing umbrellas - Los Angeles Times 2018-10-15T04:00:00Z Stalagmites, calcium carbonate formations on the floors of caves, grow drip by drip as mineral-rich rainwater seeps in. Massive drought or myth? Scientists spar over an ancient climate event behind our new geological age 2018-08-08T04:00:00Z Portland cement is produced in large part with limestone, a type of rock that's composed mainly of a chemical compound called calcium carbonate. Cement Producers Are Developing a Plan to Reduce CO2 Emissions 2018-07-09T04:00:00Z Mapped for calcium, the painting showed yellow-green splashes where conservators had made repairs with a calcium carbonate filler. How to spot a perfect fake: the world’s top art forgery detective 2018-06-15T04:00:00Z The SCoPEx team’s initial stratospheric experiments will focus on calcium carbonate, which is expected to absorb less heat than sulfates and to have less impact on ozone. First sun-dimming experiment will test a way to cool Earth 2018-11-26T05:00:00Z This produces potassium hydroxide, which is recycled back to the contactor, and pellets of calcium carbonate. Extracting carbon dioxide from the air is possible. But at what cost? 2018-06-07T04:00:00Z When the coral slices were put in the X-ray scanner, a distinctive series of light and dark growth rings became visible, reflecting the density of the calcium carbonate that made up the coral skeleton. Cores from Coral Reefs Hold Secrets of the Seas' Past and Future 2018-06-06T04:00:00Z Each efficiency apartment in the calcium carbonate complex is occupied by both a tentaculate animal related to jellyfish and an alga tucked inside it. Algae Living inside Salamanders Aren't Happy about the Situation 2018-05-20T04:00:00Z The proposed facility would grind raw limestone, also known as calcium carbonate, into a fine powder, package the material, and distribute it for use in food and pharmaceutical products. Firm seeks permit for powder manufacturing in coastal zone 2018-05-15T04:00:00Z The team is ready to spray calcium carbonate particles, but could instead use salt water to test the sprayer if the advisory committee objects. First sun-dimming experiment will test a way to cool Earth 2018-11-26T05:00:00Z A calcium carbonate crystal deep inside your ear brushes against hairs when you move, signaling up from down to your brain. This Fungus Borrowed From Ancient Bacteria to Defy Gravity 2018-04-27T04:00:00Z When waters are cooler, corals use more of the element strontium to supplement the calcium carbonate they use to build their skeletons. Cores from Coral Reefs Hold Secrets of the Seas' Past and Future 2018-06-06T04:00:00Z All three types of crystals that the team studied—calcite, a form of calcium carbonate; cordierite, an iron- and magnesium-rich silicate; and tourmaline, a boron-rich silicate—worked well at intervals of 3 hours or less. Viking seafarers may have navigated with legendary crystals 2018-04-03T04:00:00Z The shield is biodegradable and is made of calcium carbonate, the same component that coral skeletons are made of. Floating Sunscreen-Like Film Could Protect the Great Barrier Reef 2018-03-27T04:00:00Z This prevents a build up of calcium carbonate, which corals draw from seawater to build their skeleton. Carbon dioxide levels threaten reefs 2018-03-14T04:00:00Z Using this information, the researchers created a model to predict future changes in calcium carbonate levels and global reef responses. Corals Are Dissolving Away 2018-02-23T05:00:00Z Anticipating objections about its dating method, Pike’s team collected samples from the outer, middle and inner layers of the calcium carbonate crust and dated them separately. Neanderthal artists made oldest-known cave paintings 2018-02-21T05:00:00Z The ability to balance depends on the formation of tiny crystals of calcium carbonate in the inner ear. Unlocking Secrets of Sour Flavors With Something Found in Your Ears 2018-02-03T05:00:00Z As they grow, they’ll work as a catalyst within the calcium-rich conditions of the concrete to promote precipitation of calcium carbonate crystals. Fungi Can Help Concrete Heal Its Own Cracks 2018-01-24T05:00:00Z These animals live on coral reefs in tropical and subtropical waters around the world, building tiny, tubular homes with their own secretions of calcium carbonate. To See the Best Christmas Trees, You’ll Need Scuba Gear 2017-12-05T05:00:00Z They lack otoliths, lumps of calcium carbonate in the inner ear that build layers at a regular rate throughout a bony fish’s life. Many Sharks Live a Century—Longer Than Thought 2017-11-13T05:00:00Z Initial concern, and still probably best known to the public, focused on calcifiers — a diverse group of marine organisms that make shells or skeletons from calcium carbonate. Sea change : Nature : Nature Research 2017-10-10T04:00:00Z The reaction that takes place creates calcium carbonate particles that become permanently bound within the concrete - and make the concrete up to 20% stronger. From fluffy pillows to concrete: The uses of captured CO2 2017-10-09T04:00:00Z On a tour of the site, Dr. Ryan pointed out a line of mortar in which alternating layers of clay and calcium carbonate made a stronger fill and insulated the surrounding rooms. Ruined ‘Apartments’ May Hold Clues to Native American History 2017-09-04T04:00:00Z These microscopic algae build their own armor by surrounding themselves with dozens of limestone, or calcium carbonate, scales. The Black Sea Turned Turquoise, Thanks to a Phytoplankton Bloom 2017-06-16T04:00:00Z As the atmosphere inside changed, water droplets rich in calcium carbonate and carbon dioxide dripped through the cave at a slow enough rate to release carbon dioxide into the air. How Mother Nature and a Pentagon Mathematician Created the World's Largest Instrument 2017-06-09T04:00:00Z In 2000, coccolithophores — single-celled algae that build striking shells from overlapping plates of calcium carbonate — were reported3 to form their shells more slowly when exposed to water high in dissolved CO2. Sea change : Nature : Nature Research 2017-10-10T04:00:00Z The cannon, encrusted with sea life and calcium carbonate, was taken to a conservation lab at the Washington Navy Yard to be desalinated and stabilized. US navy hopes cannon found by divers is from wreck of the USS Revenge 2017-06-03T04:00:00Z The result is a model of coral calcification that starts with a malleable form of calcium carbonate, called amorphous calcium carbonate. In Coral Skeletons, Microscopic Portraits of Resilience? 2017-06-01T04:00:00Z The animal creates its own hard tube shell, made of calcium carbonate, by secreting a substance. Live, long and black giant shipworm found in Philippines - BBC News 2017-04-18T04:00:00Z With the Linnaean classification Kuphus polythalamia, the creature lives in the mud inside a long tube made of calcium carbonate secreted by the animal. Bizarre bivalve: first living giant shipworm discovered in Philippines 2017-04-17T04:00:00Z More-acidic sea water means that there will be fewer carbonate ions to incorporate into calcium carbonate, and therefore less raw material for building shells. Sea change : Nature : Nature Research 2017-10-10T04:00:00Z “From the time eggs are fertilised, Pacific oyster larvae precipitate roughly 90% of their bodyweight as calcium carbonate shell within 48 hours,” George Waldbusser at Oregon State University told the Climate News Network. How warming seas are forcing fish to seek new waters 2017-01-07T05:00:00Z The researchers say they believe that amorphous calcium carbonate is initially formed by proteins. In Coral Skeletons, Microscopic Portraits of Resilience? 2017-06-01T04:00:00Z Some paleosols contain nodules of precipitated calcium carbonate as well as bits of organic matter, from which atmospheric CO2 levels can be worked out. Fossil leaves suggest global warming will be harder to fight than scientists thought 2017-01-04T05:00:00Z These strange structures are calcium carbonate crystals, imaged at 2,000× magnification. 2016 in pictures: The best science images of the year 2016-12-15T05:00:00Z “But the dilemma you have is it dissolves all the evidence that you’re primarily looking for,” Bralower said, noting that the calcium carbonate shells of many marine organisms are dissolved by acidic water. Right after an asteroid killed the dinosaurs, life returned to the scene of the crime 2016-12-13T05:00:00Z Shells of marine creatures are made from calcium carbonate and their formation is disrupted by acidic water. How warming seas are forcing fish to seek new waters 2017-01-07T05:00:00Z “This is the first report of amorphous calcium carbonate in coral, and it really does suggest the organism is able to control how solid material is deposited,” she added. In Coral Skeletons, Microscopic Portraits of Resilience? 2017-06-01T04:00:00Z Omya mines marble in Vermont that it crushes into calcium carbonate, a component of many paints, paper and other products. Vermont green group bows to mining company’s silence demand 2016-12-06T05:00:00Z The threat most talked of is to creatures that make shells out of calcium carbonate. Ocean acidification: a natural experiment 2016-12-01T05:00:00Z To boost the nutrient profile of these beverages, some manufacturers fortify them, adding pea protein or rice protein to raise the protein count, calcium phosphate or calcium carbonate to increase the calcium, and vitamins. Which Milk Is Most Nutritious: Soy, Cashew, Almond or Coconut? 2016-11-11T05:00:00Z 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 Acid dissolves calcium carbonate, so the more acidic the ocean is, the more difficult it is for corals to organize that first bit of skeleton. In Coral Skeletons, Microscopic Portraits of Resilience? 2017-06-01T04:00:00Z Soon thereafter, it begins to elongate and to secrete its characteristic calcium carbonate tube around itself. Foul play 2016-08-25T04:00:00Z As school chemistry experiments with chalk and vinegar demonstrate, calcium carbonate dissolves in acid, so an ocean less alkaline than it used to be might make life harder for shell-forming animals. Ocean acidification: a natural experiment 2016-12-01T05:00:00Z These animals, which are covered in hundreds of venomous spikes, feed on the flesh of corals until all that's left is a calcium carbonate skeleton. Sea snails could save Great Barrier Reef from starfish - BBC News 2016-08-18T04:00:00Z Freakishly heavy summer rain turns the calcium carbonate dust left behind into a waterfall of cafe au lait - a snaking tributary of gleaming ointment. Demolishing Michelangelo's mountain - BBC News 2016-07-23T04:00:00Z It’s true that corals lose calcium carbonate in a more acidic environment — but they maintain the ability to grow back that skeleton, “which is good news,” Dr. Falkowski said. In Coral Skeletons, Microscopic Portraits of Resilience? 2017-06-01T04:00:00Z Forams, as they are known, are single-celled marine creatures which grow shells made of calcium carbonate. Shell shock 2016-07-14T04:00:00Z The skeletons of hard corals are made of aragonite, a calcium carbonate mineral. World War II, Opium Wars recorded in ocean’s corals 2016-05-31T04:00:00Z The site is remarkably well preserved because the stalagmites became encased in calcium carbonate soon after the walls were built. Neanderthals built mysterious cave structures 175,000 years ago 2016-05-25T04:00:00Z “When they produce calcium carbonate, they release carbon dioxide,” he explains. The greenhouse that acts like a beetle and other inventions inspired by nature 2016-04-10T04:00:00Z And of course, like thousands of other animals with calcium carbonate shells, they are threatened by ocean acidification. Tiny sea snail 'swims like a bee' - BBC News 2016-02-18T05:00:00Z Equally troubling, the change means waters increasingly hold too little calcium carbonate, which shelled creatures need to develop and grow. Five Reasons We Need To Act Now on Climate Change 2015-12-04T05:00:00Z Most of the calcium carbonate now used in industry, an estimated 15 billion tonnes per year, comes from mining such deposits. How to make the most of carbon dioxide 2015-10-27T04:00:00Z The lower the temperature at which a mineral forms—in this case, the calcium carbonate in the eggshell—the more bonds between the rare isotopes carbon-13 and oxygen-18. How to take a dinosaur’s temperature 2015-10-13T04:00:00Z The result is calcium carbonate – limestone – a building material that California’s construction industry needs. The greenhouse that acts like a beetle and other inventions inspired by nature 2016-04-10T04:00:00Z One of the ways that ocean acidification threatens marine life is by reducing levels of calcium carbonate, a building block of seashells. Teens Tackle Alzheimer's Disease, Vaccine Shortages at Google 2015-09-21T04:00:00Z And, as is often the case in such desert settings, a thin coating of calcium carbonate has also glazed the paint, further obscuring its exact edges. ‘Winged monster’ on ancient rock art debunked by scientists 2015-08-25T04:00:00Z After factoring in energy costs, says Devenney, the company's process captures about 170 kilograms of CO2 for every tonne of calcium carbonate manufactured — versus zero kilograms for every tonne that is mined. How to make the most of carbon dioxide 2015-10-27T04:00:00Z It needs a sustainable fractionation method to separate proteins, calcium carbonate and chitin — one that avoids corrosive or hazardous reagents and minimizes waste. Sustainability: Don't waste seafood waste 2015-08-09T04:00:00Z For example, more-acidic waters slow the growth and worsen the health of many species that build structures such as shells from calcium carbonate. Crucial ocean-acidifcation models come up short 2015-08-04T04:00:00Z Yet, every year, the seafood industry discards roughly 6 million tons of calcium carbonate in the form of seashells, said O’Brien. Teens Tackle Alzheimer's Disease, Vaccine Shortages at Google 2015-09-21T04:00:00Z These intricate deposits of calcium carbonate contain within them complex mathematical equations, they shelter surprisingly powerful and inventive creatures and they reveal the planet’s history. The vast and complicated universe inside a seashell 2015-07-31T04:00:00Z The hairs are topped by a membrane embedded with even tinier calcium carbonate crystals. Vertigo Knocks Millions off Their Feet, and Doctors Are Looking at Ear Implants to Relieve It 2015-07-30T04:00:00Z The market price of ground calcium carbonate is around $60–66 per tonne for coarse particles, which are used in construction, pigments, fillers and soil treatments. Sustainability: Don't waste seafood waste 2015-08-09T04:00:00Z The scientists say ocean acidification is likely to impact reproduction, larval survival and feeding, and growth rates of marine organisms - especially those with calcium carbonate shells or skeletons. Oceans face 'acidification crisis' - BBC News 2015-07-02T04:00:00Z The ring of white calcium carbonate absorbed into the rock from the water contrasts sharply with the deep colours of the sandstone. Disappearing Lake Powell underlines drought crisis facing Colorado river 2015-05-17T04:00:00Z The powder, calcium carbonate, is used as filler in everything from toothpaste, cosmetics and foodstuffs to paint and paper. Michaelangelo's Marble Being Sold Cheap by the Saudis 2015-03-27T04:00:00Z A nonprofit institute in Taiwan recently showed off a system that uses calcium to bind with carbon dioxide, and produce calcium carbonate, at low temperatures. Capturing Carbon as a Byproduct of Running a Fuel Cell 2014-12-14T05:00:00Z The medication’s main ingredient is calcium carbonate, also used as a dietary supplement for people low on the nutrient, according to the National Institutes of Health. 12 Key Health Items to Carry Every Day 2014-10-31T04:00:00Z To date the Indonesian paintings, Aubert and his colleagues looked at calcium carbonate deposits known as “cave popcorn” that formed as mineral-rich water trickled down the cave walls. Cave paintings in Indonesia suggest art came out of Africa 2014-10-08T04:00:00Z They’re therefore relatively free of the microscopic life that turns richer waters murky—and is normally associated with the deposition of calcium carbonate. Bahamas Creation Linked To African Dust 2014-08-03T04:00:00Z Oysters subjected to water with a lower pH — that is, more acidic water — cannot form the calcium carbonate shells they need to survive. Marine industries at risk on both coasts as oceans acidify When the calcium carbonate is heated, it releases the carbon dioxide again. Capturing Carbon as a Byproduct of Running a Fuel Cell 2014-12-14T05:00:00Z Ocean acidification decreases the availability of carbonate, a material that thousands of species of sea creatures use to form calcium carbonate shells. More proof that climate change is ruining seafood for everyone 2014-07-30T04:00:00Z A pearl forms inside the soft tissue of a living shelled mollusk when the animal reacts to grit by coating it with concentric layers of crystalline calcium carbonate called nacre, or mother-of-pearl. What you should know about pearls 2014-07-20T04:00:00Z That activity in turn causes calcium carbonate to precipitate, an event known as a whiting. Bahamas Creation Linked To African Dust 2014-08-03T04:00:00Z “The bioavailability of calcium from this source, as tested in piglets, was similar or better than that of food-grade purified calcium carbonate,” the authors wrote. Eating the Shell Along With the Egg? 2014-06-30T04:00:00Z Animals' so-called skeletal reef building entails the deposition of shells made of calcium carbonate, while microbial reefs typically consist of cyanobacteria and other microorganisms. Earliest skeletal animals were reef builders 2014-06-25T04:00:00Z The vaporized rock had originally been identified as ooids, which are tiny spheres of calcium carbonate that usually form in shallow tropical seas, such as the Bahama Banks. Earth's Oldest and Biggest Crater Yields New Secrets 2014-04-29T22:00:00Z The fibers are made of chitin, an organic polymer commonly found in insect and crustacean exoskeletons, while gaps between are filled with calcium carbonate and calcium phosphate. Peacock mantis shrimp’s swift, deadly punch inspires superstrong composite materials 2014-04-26T22:21:17Z A: Your wife is getting 2,250 mg of calcium carbonate daily, 40 percent of which is elemental calcium. Could stethoscopes be spreading germs? 2014-04-16T19:10:25Z Minerals, which produces calcium carbonate, used to whiten everything from paper to talc, said Amcol would immediately add to earnings once the deal closes, which is expected in the first half of this year. UPDATE 1-Minerals Technologies beats Imerys with $1.7 bln offer for Amcol 2014-03-10T14:24:13Z Minerals Technologies produces calcium carbonate, used to whiten everything from paper to talc. UPDATE 1-Minerals Technologies offers to buy AMCOL for $1.36 bln 2014-02-14T16:58:58Z The researchers say that by 2020, ten percent of the Arctic will be inhospitable to species that build their shells from calcium carbonate. Emissions boost oceans 'acid trip' 2013-11-14T01:13:01Z The chemical interaction of the carbon dioxide and the lime forms calcium carbonate. The War On Coal Goes Global: China Bans New Plants As Obama EPA Plans Killer Regs 2013-09-12T16:31:00Z To do this they manufactured a microscopic sphere of calcium carbonate only four millionths of a metre in diameter. 'Fastest spinning object' created 2013-08-28T10:32:25Z We found that cells produced more calcium carbonate under future ocean conditions, but had the same amount of organic carbon as in present conditions. Dot Earth Blog: Papers Find Mixed Impacts on Ocean Species from Rising CO2 2013-08-26T15:51:27Z 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 During the first two days of life, an oyster’s prime directive is to build a shell of calcium carbonate to protect itself against predators. Baby Oysters In 'Death Race' With Acidifying Oceans 2013-07-26T12:45:00Z After the rabbit skin glue is applied, some of it was mixed with calcium carbonate to create gesso, the common fine art primer. How to Destroy Priceless Works of Art 2013-07-23T15:45:00.917Z That would be because the shell was made from a mixture of paraffin wax, gypsum powder and calcium carbonate, the egg-white made from sodium algninate and the yolk from a mix of resin and pigment. 10 Reasons Not to Go Locavore in China 2013-07-11T04:20:28Z A year-long laboratory study of coccolithophores — an important type of phytoplankton — found they remained capable of forming their calcium carbonate skeletons even in warmer, more acidic water. Dot Earth Blog: Papers Find Mixed Impacts on Ocean Species from Rising CO2 2013-08-26T15:51:27Z At the bottom of Challenger Deep, calcium carbonate shells are not an option because the intense pressure — over 1,000 times sea-level — dissolves the mineral. What Lives at the Bottom of the Mariana Trench? More Than You Might Think 2013-04-15T00:15:05.547Z That damages hard corals, tiny that secrete calcium carbonate to form their stony protective layer. Reef-Building Corals Lose Out to Softer Cousins Due To Global Warming 2013-03-25T20:45:02.577Z With their shells, these protozoa produce up to 2 kilograms of calcium carbonate per square meter of ocean floor. Migrating Ocean Microbe May Help Protect Coastlines 2013-02-08T16:15:03.503Z The Newcastle researchers say that an alternative approach would be to lock up the CO2 in another substance such as calcium carbonate or magnesium carbonate. Sea urchin 'trick' captures CO2 2013-02-05T02:57:52Z The most obvious peril is that marine organisms like clams and sea snails either can’t build their calcium carbonate shells or find their housing harder to maintain. Could Climate Change Boost Toxic Algal Blooms in the Oceans? 2012-12-21T13:15:00.173Z Acidic waters are corrosive to many larval shellfish, and they reduce the amount of available carbonate, which some marine organisms need to form calcium carbonate shells or skeletons. Washington State Declares War on Ocean Acidification 2012-11-27T22:15:00.630Z Seawater from these depths is more corrosive to aragonite, the type of calcium carbonate that forms pteropod shells. Antarctic marine life threatened 2012-11-25T18:13:39Z The oyster reacts to the introduction of the foreign body by coating it with layers of nacre - crystallized calcium carbonate and an organic protein. Pearlers past and present in Australian town 2012-09-09T23:50:46Z At a time when fish stocks are down and coral reefs are dying, Mr. Leal said seashells — made by mollusks mostly from the calcium carbonate in seawater — continue to thrive. Florida Island Draws Seashells and Their Hunters 2012-08-07T15:40:10Z "The fact the same effect occurs consistently in all four types suggests the effect is widespread across marine species, and that increasing ocean acidification will progressively reduce the availability of calcium carbonate," it said. Ocean Acidification Thins Marine Creatures' Shells and Could Disrupt Food Chains 2012-08-06T00:45:02.960Z Finally, the team slathered the porous surface with a noncrystalline form of calcium carbonate, which infiltrated the material and then slowly crystallized when placed in a container of humid air. ScienceShot: No Mother Needed 2012-07-24T18:24:30Z As more carbon dioxide dissolves in the ocean, the waters acidify, decreasing the concentration of carbonate and making it more difficult for these organisms to form calcium carbonate shells. Remarkable Creatures: ‘Nature’s Masons’ Do Double Duty as Earth’s Storytellers 2012-06-25T22:33:39Z They did this by collecting samples of the thin crusts of calcium carbonate that formed atop the images through the same process that forms stalactites and stalagmites. Oldest Cave Paintings May Be Creations of Neandertals, Not Modern Humans 2012-06-14T20:45:00.243Z U-series dating takes advantage of the fact that calcite, the form of calcium carbonate in stalactites and stalagmites, contains trace amounts of radioactive uranium-238, which decays to form atomic elements including radioactive thorium-230. Did Neandertals Paint Early Cave Art? 2012-06-14T20:30:00Z Water seeping into caves leaves deposits of calcium carbonate, or calcite, as stalactites and stalagmites or simpler crusts over cave surfaces. New Dating Puts Cave Art in the Age of Neanderthals 2012-06-14T18:08:51Z If the aragonite saturation state falls below a value of 1, a condition known as undersaturation, all calcium carbonate shells will dissolve. A Rising Tide of Acid Off California 2012-06-14T19:05:43Z Limestone is composed largely of crystallized calcium carbonate. Remarkable Creatures: ‘Nature’s Masons’ Do Double Duty as Earth’s Storytellers 2012-06-25T22:33:39Z Small eddies in the flow lead to increased deposition of calcium carbonate at certain regularly spaced locations, researchers reported online this month in . ScienceShot: Underground Rain Gauge? 2012-06-12T22:25:22Z And sea creatures like oysters and corals use calcium carbonate minerals to build shells and skeletons. Green Blog: Study Links Raised Carbon Dioxide Levels to Oyster Die-Offs 2012-04-12T10:00:48Z Increased acidity attacks the shells of shellfish and the skeletal foundation of corals, dissolving the calcium carbonate they’re made of. Editorial: Changing the Chemistry of Earth?s Oceans 2012-03-10T04:24:21Z They found that calcium carbonate formed faster in areas where the bacteria were living than it did in sterile solutions. Genetically Engineered Bacteria Could Help Fight Climate Change 2012-02-26T17:00:00Z The urine of pack rats is creamy in color and contains calcium carbonate. Comparative Ecology of Pinyon Mice and Deer Mice in Mesa Verde National Park, Colorado 2012-02-24T03:00:32.243Z Tufa, tū′fa, n. a variety of calcium carbonate usually deposited from springs—calcareous tufa; the word was formerly used as synonymous with tuff.—adj. Chambers's Twentieth Century Dictionary (part 4 of 4: S-Z and supplements) 2012-01-30T03:00:19.113Z Ice′land-moss, a lichen found in Iceland, Norway, &c., valuable as a medicine and for food; Ice′land-spar, a transparent variety of calcite or calcium carbonate. Chambers's Twentieth Century Dictionary (part 2 of 4: E-M) 2012-01-11T03:00:23.770Z Waters containing sulphuretted hydrogen, on exposure to the air in the presence of limestone, may yield gypsum by the formation of sulphuric acid and its interaction with the calcium carbonate. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 7 "Gyantse" to "Hallel" 2011-12-26T03:00:11.613Z The team estimates that every year, tropical fish excrete 6.1 million kilograms of calcium carbonate, equivalent to the weight of 1000 adult elephants, over an area of 111,577 square kilometers. The Year in Pictures 2011-12-22T19:11:37Z Dark sediments containing mud and silt from winter floods alternate with summertime sediment rich with white calcium carbonate precipitated from a seasonally shrinking lake. Dead Sea Dried Up in Past 2011-12-07T18:32:19Z Such decomposition, in the presence of potassium and calcium carbonates—the lye and lime—form potassium and calcium nitrates, together with some magnesium and sodium nitrates. De Re Metallica, Translated from the First Latin Edition of 1556 2011-11-16T03:00:21.977Z Seawater will then work to neutralize this acidic effect by dissolving numerous forms of calcium carbonate prevalent in the marine environment, like a giant antacid. The Great Barrier Reef, RIP? 2011-10-12T00:22:01Z The calcium carbonate of his bones is the calcium carbonate of her rocks as seen in cliffs at Flamborough and Dover. Psychical Miscellanea Being Papers on Psychical Research, Telepathy, Hypnotism, Christian Science, etc. 2011-10-01T02:00:35.717Z They consist mainly of chlorides of sodium and magnesium, the sulphates of magnesium, calcium and potassium, with minuter quantities of magnesium bromide and calcium carbonate. 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 ShengdaTech is a leading maker of nano precipitated calcium carbonate or NPCC, an additive used in automotive and polyvinyl chloride products, in the People’s Republic of China, according to its website. Mets-Madoff Trustee, Linden Ponds, Petters: Bankruptcy 2011-08-22T13:47:02Z The calcium mixed with carbonates from the seawater and precipitated as calcium carbonate. Microbial Mat Bears Direct Evidence of 3.3 Billion-Year-Old Photosynthesis 2011-07-06T19:45:00.520Z Most of the 21 islands are uninhabited, and the corals were mined for use as a binding material in the construction industry, as they were rich in calcium carbonate. Mining 'causes islands to sink' 2011-05-13T17:01:56Z That is, the calcareous oozes are formed by the concentration of calcium carbonate through the vital action of animals and to a less extent of plants. North America 2011-05-05T02:00:20.027Z When properly mixed with other pigments, such as zinc oxide and calcium carbonate, fair results are obtained as a pigment for outside work. Paint Technology and Tests 2011-09-15T02:00:12.263Z The heat of rocks far beneath the surface warms the water of the springs, which, passing through a bed of limestone, brings to the surface a deposit of pure calcium carbonate. The Lure of the Camera 2011-04-27T02:00:25.413Z Beneath the surface they found small particles of aragonite, a calcium carbonate mineral. Microbial Mat Bears Direct Evidence of 3.3 Billion-Year-Old Photosynthesis 2011-07-06T19:45:00.520Z Dog-tooth Spar, a form of mineral calcium carbonate or calc-spar found in Derbyshire and other parts of England, and named from a supposed resemblance of its pointed crystals to a dog's tooth. The New Gresham Encyclopedia Volume 4, Part 1: Deposition to Eberswalde 2011-04-14T02:00:57.977Z Under certain conditions calcium carbonate is concentrated at or near the earth's surface by chemical agencies, as about springs where calcareous tufa, travertine, etc., are precipitated, and in caverns where stalactites and stalagmites are formed. North America 2011-05-05T02:00:20.027Z The value of zinc oxide and calcium carbonate in lithopone paints as detergents of blackness, has been demonstrated at both Atlantic City and Pittsburg.” Paint Technology and Tests 2011-09-15T02:00:12.263Z The oyster vanquishes the invader by surrounding it with the fine, opalescent deposits of calcium carbonate known as nacre, and little by little a pearl is born. Obituaries: Salvador Assael, 88, Dies; Coaxed Riches From Pearls 2011-04-13T00:27:54Z Modern photosynthetic mats contain sulphur-reducing bacteria that also precipitate calcium carbonates. Microbial Mat Bears Direct Evidence of 3.3 Billion-Year-Old Photosynthesis 2011-07-06T19:45:00.520Z Together, they determined that the Puerto Rican white-lipped frog’s freakish seismic sensitivity results from an inner ear sac brimming with calcium carbonate crystals. Stealth percussionists of the animal world 2011-03-22T16:15:00.347Z From this mode of origin it may be truthfully inferred that limestone may have been formed during any age since organisms having the power of secreting calcium carbonate existed on the earth. North America 2011-05-05T02:00:20.027Z Plates coated with calcium carbonate or whiting in oil presented a very fair appearance at the start of the test, but they soon began to chalk and disintegrate. Paint Technology and Tests 2011-09-15T02:00:12.263Z Corals build colonies that secrete calcium carbonate to form ocean reefs. Why Australia's Great Barrier Reef Needs Saving 2011-03-02T08:00:00Z The team estimates that every day, tropical fish excrete 6.1 million kilograms of calcium carbonate, equivalent to the weight of 1000 adult elephants, over an area of 111,577 square kilometers. ScienceShot: Marine Mud Is Largely Fish Poop 2011-02-22T19:43:02Z Reefs are made of animals called polyps with a hard skeleton made of calcium carbonate. Corals Moving North 2011-01-24T15:57:00Z Both oyster shell and oyster adhesive are made of protein and calcium carbonate, said Jonathan Wilker, a chemist at Purdue University and one of the study’s authors. Observatory: Special Adhesive Helps Oysters Stick Together 2010-08-30T20:12:00Z What happened to them when the sea changed between the two forms of calcium carbonate — shell and coral? Nudibranchs, Corals and Readers' Questions 2010-08-10T17:29:00Z In reefs, the structure is big lumps of calcium carbonate on which things grow and around which they graze and hunt. Ocean acidification: The other carbon-dioxide problem 2010-07-01T11:08:00Z She explained how she used a laser as an "optical scalpel" to make the calcium carbonate fall off without damaging the paint. Archaeologists find oldest paintings of apostles 2010-06-22T14:51:00Z These shells grow by secreting calcium carbonate and it’s never pure — trace elements get incorporated in there. Tracking Oil Though the Food Web 2010-06-08T15:50:00Z It is left with calcium carbonate and magnesium carbonate, which are used in making cement and aggregate. In Cement, the Stirrings of a Potential Trap for Some Carbon 2010-03-22T01:40:00Z Temporarily hard water is formed by water, which contains carbonic acid, dissolving a portion of calcium carbonate or carbonate of lime. Soap-Making Manual A Practical Handbook on the Raw Materials, Their Manipulation, Analysis and Control in the Modern Soap Plant. From a solution of calcium carbonate in water containing carbon dioxide crystals of calcite are deposited at the ordinary temperature, but from a warm solution aragonite crystallizes out. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral" "The laser created a sort of a mini explosion of steam when it interacted with the calcium carbonate to make it detach from the surface," she said. Archaeologists find oldest paintings of apostles 2010-06-22T14:51:00Z From these salts is derived the calcium deposited as calcium carbonate to form the shells of the Foraminifera and the larger shells in the Chalk. The Geological Story of the Isle of Wight It absorbs the carbonic ion, incorporates it into a molecule of calcium carbonate, and ejects the chlorine ion into the surrounding medium. The Mechanism of Life The soap is then salted out and allowed to settle out the calcium carbonate. Soap-Making Manual A Practical Handbook on the Raw Materials, Their Manipulation, Analysis and Control in the Modern Soap Plant. Aragonite is the more unstable of the two modifications of calcium carbonate. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral" Calcite , calcium carbonate, a rock that includes limestone and marble. Unexplored! Casein is insoluble in pure water, but dissolves readily in water to which an alkali or calcium carbonate is added. Dietetics for Nurses Thus when hard limestone is the form of calcium carbonate locally available, it is ground dry and mixed with the correct proportion of clay also dried and ground. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 6 "Celtes, Konrad" to "Ceramics" Precipitated calcium carbonate may be used in place of the mercuric oxide, or a hypochlorite may be decomposed by a dilute mineral acid and the resulting solution distilled. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 3 "Chitral" to "Cincinnati" The insufficiency of this argument, however, is shown by the data for arsenious and antimonious oxides, and also for the polymorphs of calcium carbonate, the more symmetrical polymorphs having a lower density. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1 "Châtelet" to "Chicago" Pepton is sometimes found in the excretions of paralytic persons in whom there is always an increased elimination of phosphates and calcium carbonate. Criminal Man According to the Classification of Cesare Lombroso The village of Canisteo, New York, has a hard spring water, the hardness being recorded by the State Department of Health as 162.8 parts calcium carbonate in a million parts of water. Rural Hygiene This limestone consists of calcium carbonate most intimately intermixed with very finely divided silica. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 6 "Celtes, Konrad" to "Ceramics" Much calcium carbonate is also lost during the process: and when this constituent falls too low, the soil becomes "sour" and unsuited for crops. The Enclosures in England An Economic Reconstruction Limestones lose their calcium carbonate by solution, leaving only clay with fragments of quartz or chert as impurities. The Economic Aspect of Geology When calcium sulphate is present, the nascent methane induces the formation of calcium carbonate, sulphuretted hydrogen and water. Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 2 "Baconthorpe" to "Bankruptcy" The gypsum neutralises the alkalinity of nitrifying solutions by converting the alkaline ammonium carbonate into neutral ammonium sulphate, the calcium carbonate being precipitated. Manures and the principles of manuring The supply of materials containing naturally suitable proportions of calcium carbonate and clay being limited, attempts were made to produce artificial mixtures which would serve a similar end. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 6 "Celtes, Konrad" to "Ceramics" Secondly, the processes of liming and marling the soil were known, and by these means the necessary calcium carbonate was supplied. The Enclosures in England An Economic Reconstruction The marine phosphate beds originally consist principally of calcium phosphate and calcium carbonate in varying proportions. The Economic Aspect of Geology If the SH2 runs short they oxidize the sulphur again to sulphuric acid, which combines with any calcium carbonate present and forms sulphate again. Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 2 "Baconthorpe" to "Bankruptcy" Calcium is an element which will unite with oxygen and carbon dioxide to form a compound known as calcium carbonate. Right Use of Lime in Soil Improvement The product in question was found to be very sensitive to the action of bases, and was destroyed by the incidental operation of neutralising the mixture of oxidised products with calcium carbonate. Researches on Cellulose 1895-1900 The chief of these is calcium phosphate, with which much smaller quantities of calcium carbonate, and magnesium phosphate and carbonate occur. Text Book of Biology, Part 1: Vertebrata Both calcium carbonate and calcium phosphate are soluble in ordinary ground waters, but the carbonate is the more soluble of the two. The Economic Aspect of Geology The bubbles of gas escape through the limewater in B. A precipitate of calcium carbonate soon forms in the limewater, showing the presence of carbon dioxide. An Elementary Study of Chemistry Magnesium carbonate is usually found in combination with calcium carbonate, and when about 47 per cent of the total carbonates is magnesium carbonate, the limestone is known as dolomite. Right Use of Lime in Soil Improvement Pure paper was allowed to ferment in the presence of calcium carbonate at a temperature of 35° for 13 months. Researches on Cellulose 1895-1900 CALCITE, a mineral consisting of naturally occurring calcium carbonate, CaCO3, crystallizing in the rhombohedral system. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary" They are in fairly close proximity to igneous rocks, and magnesia-bearing solutions issuing from these rocks are believed to have dissolved out the calcium carbonate of the dolomite and replaced it with magnesium carbonate. The Economic Aspect of Geology The coal reduces the sulphate to sulphide, which in turn reacts upon the calcium carbonate. An Elementary Study of Chemistry In the correction of soil acidity magnesium is more effective than calcium, 84 pounds of the carbonate being equal to 100 pounds of calcium carbonate. Right Use of Lime in Soil Improvement By this means the calcium sulphate is converted into calcium carbonate which is insoluble in water, so that it remains distributed throughout the mass of the brick instead of being deposited on the surface. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria" Well-crystallized material, such as Iceland-spar, usually consists of perfectly pure calcium carbonate, but at other times the calcium may be isomorphously replaced by small amounts of magnesium, barium, strontium, manganese, zinc or lead. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary" Diamond is made of carbon; the pearl is calcium carbonate; ruby and sapphire are aluminum oxide—varieties of the mineral corundum; the emerald is silica and alumina, with a minor amount of beryllia. The Economic Aspect of Geology The dilute solution of sodium hydroxide, filtered from the calcium carbonate, is evaporated to a paste and is then poured into molds to solidify. An Elementary Study of Chemistry Most limestones contain some percentage of magnesium, and in the case of a pure dolomite over 45% carbonate is present in combination with calcium carbonate. Right Use of Lime in Soil Improvement Calcium phosphate and calcium carbonate are important constituents of the bones and teeth; and the salts containing iron renew the hemoglobin of the blood. Physiology and Hygiene for Secondary Schools It is ordinarily prepared by the fermentation of sugar or starch, brought about by the addition of putrefying cheese, calcium carbonate being added to neutralize the acids formed in the process. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary" Then mix with eight times as much pure calcium carbonate, using a part of it to rinse out the mortar. A Text-book of Assaying: For the Use of Those Connected with Mines. It will dissolve to some extent in water containing carbon dioxide, just as will calcium carbonate, and waters containing it are called chalybeate waters. An Elementary Study of Chemistry If too much sulphuric acid is used, necessarily a large amount of calcium carbonate is essential to get it into proper condition for pulverizing. Scientific American Supplement, No. 315, January 14, 1882 This calcium carbonate was slowly deposited in crystalline form, so that in time the cracks were filled and the crushed rock firmly cemented with calcite seams. Cave Regions of the Ozarks and Black Hills But for those who desired to experiment with deteriorated canes and untried cutting machines, the addition of the calcium carbonate provides against disastrous results which would otherwise be inevitable. Scientific American Supplement, No. 633, February 18, 1888 The cyanamid is completely and quickly converted into pure ammonia and calcium carbonate, which is the same as the limestone from which carbide was made. Creative Chemistry Descriptive of Recent Achievements in the Chemical Industries The carbonates, especially calcium carbonate, constitute great strata of rocks, and are found in almost every locality. An Elementary Study of Chemistry From the total weight the weight of the dish is subtracted, which gives the weight of the calcium sulphate and the calcium carbonate, and the known weight of the wool dust, etc. Scientific American Supplement, No. 315, January 14, 1882 By the slow action of acidulated waters, the grey limestone deteriorated into a yellowish clay-bank, and now its particles are being re-united into solid rock by the deposit of calcium carbonate from the drip. Cave Regions of the Ozarks and Black Hills Many white pigments, such as zinc oxide, zinc sulphide, calcium carbonate, barium carbonate, calcium sulphate, lead white, etc., turn brown to black, and no white lacquer can be obtained with them. Handbook on Japanning: 2nd Edition For Ironware, Tinware, Wood, Etc. With Sections on Tinplating and Galvanizing During the fermentation it is necessary to neutralize the acetic acid formed with sodium or calcium carbonate. Creative Chemistry Descriptive of Recent Achievements in the Chemical Industries What weight of water is necessary to slake the lime obtained from 1 ton of pure calcium carbonate? An Elementary Study of Chemistry It is a nitro-cellulose powder, a mixture of insoluble and soluble nitro- cellulose together with the nitrates of barium and potassium, and a small percentage of calcium carbonate. Nitro-Explosives: A Practical Treatise You have seen when the shell bursts how the chalky soil of the Marne effervesces like the inkwells at school, when we used to throw a piece of calcium carbonate into them. Atlantida Sewage will be thoroughly nitrified only when a sufficient supply of calcium carbonate, or some other base, is available. Scientific American Supplement, No. 470, January 3, 1885 If a thin white crust appears on the limewater solution it is due to the formation of calcium carbonate coming in contact with the air and consequently does no harm. Every Step in Canning Like calcium carbonate, magnesium carbonate is insoluble in water, though easily dissolved by acids. An Elementary Study of Chemistry The calcium carbonate is also finely pulverised and dried, and is added to the mixed nitro-celluloses after they have been sifted through a 16-mesh sieve. Nitro-Explosives: A Practical Treatise Clearly calcium phosphate of the chick's bones is made by the digestion of the calcium carbonate from the shell and its combination with the phosphorus of the yolk. The Dollar Hen If, instead of calcium carbonate, a soluble alkaline salt is present, the quantity must be small, or nitrification will be seriously hindered. Scientific American Supplement, No. 470, January 3, 1885 Soluble litmus tablets are often obtainable, but the litmus as commonly supplied to the market is mixed with calcium carbonate or sulphate and compressed into lumps. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes The only materials permanently used up are calcium carbonate and salt, while the only waste product is calcium chloride. An Elementary Study of Chemistry The nitrates are next weighed out and dissolved in hot water, and to this solution is added the mixture of nitro-celluloses and calcium carbonate with constant stirring until the entire mass becomes a homogeneous paste. Nitro-Explosives: A Practical Treatise The chief constituents of the waters are calcium sulphate, sodium sulphate, magnesium chloride, calcium carbonate, and sodium chloride, and there are traces of other minerals. Somerset Far stronger solutions of ammonium chloride can be nitrified than of ammonium carbonate, if the solution of the former salt is supplied with calcium carbonate. Scientific American Supplement, No. 470, January 3, 1885 The most common of these interior cell crystals are those composed of calcium oxalate and calcium carbonate. Popular Science Monthly Oct, Nov, Dec, 1915 — Volume 86 In the laboratory carbon dioxide is always prepared by the action of an acid upon a carbonate, usually calcium carbonate, the apparatus shown in Fig. An Elementary Study of Chemistry Sodium or calcium carbonate to the extent of 1 per cent. is often added to dynamite to ensure its being neutral. Nitro-Explosives: A Practical Treatise The next we have to consider is limestone, which is mainly made up of a substance known to chemists as calcium carbonate, or carbonate of lime. Scientific American Supplement, No. 447, July 26, 1884 By referring to the table of combining weights given in a previous paper, it will be seen that 100 parts of calcium carbonate will yield 44 parts of carbonic acid. Scientific American Supplement, No. 288, July 9, 1881 He found that it contained small quantities of silica, iron phosphate, magnesium carbonate, calcium carbonate, calcium sulphate, potassium nitrate, potassium sulphate, sodium borate, sodium sulphate, and a considerable quantity of sodium chloride. Inca Land Explorations in the Highlands of Peru What weight of sodium hydroxide is necessary to neutralize the carbonic acid formed by the action of hydrochloric acid on 100 g. of calcium carbonate? An Elementary Study of Chemistry The grain is then spread on a disinfected muslin cloth and mixed with calcium carbonate. Free from School This property is probably assisted by the presence of numerous fine tubes arranged vertically and lined with calcium carbonate; these are supposed to have been formed in the first place by fibrous rootlets. The Antiquity of Man There are, however, a great many agricultural soils covering large areas and yielding very abundant crops which contain very much larger quantities of calcium carbonate. Dry-Farming : a System of Agriculture for Countries under a Low Rainfall Keep in mind that _magnesian _only means that the limestone contains some magnesium. and that it is not a pure calcium carbonate. The Story of the Soil; from the Basis of Absolute Science and Real Life, What weight of calcium carbonate would be necessary to prepare sufficient carbon dioxide to saturate 10 l. of water at 15° and under ordinary pressure? An Elementary Study of Chemistry From the sea water the polyps secrete calcium carbonate and build it up into the stony framework which supports their colonies. The Elements of Geology Examine white sand, calcium carbonate, sodium carbonate, smalt; bottle, window, Bohemian and flint glass. An Introduction to Chemical Science Some authors state that from 8 to 20 per cent of calcium carbonate makes a soil unfitted for plant growth. Dry-Farming : a System of Agriculture for Countries under a Low Rainfall In 1,000 grams one finds 96.5% water and about 2.66% sodium chloride; then small quantities of magnesium chloride, potassium chloride, magnesium bromide, sulfate of magnesia, calcium sulfate, and calcium carbonate. Twenty Thousand Leagues Under the Sea Pearls, chalk, coral, and shells are largely calcium carbonate. An Elementary Study of Chemistry The reef rock is made of corals in place and broken fragments of all sizes, cemented together with calcium carbonate from solution by infiltrating waters. The Elements of Geology |
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