| 单词 | oxidant |
| 例句 | Selenium itself is an oxidant, but in low doses it activates responses in a controlled manner, predisposing the body to better defense. Selenium reduces mixtures of environmental pollutants' harmful effects on health 2023-10-30T04:00:00Z After just six weeks of shortened sleep, the study found, the cells that line our blood vessels are flooded by damaging oxidants. Not getting enough sleep? Your vascular cells are drowning in oxidants 2023-10-13T04:00:00Z The pangrams from yesterday’s Spelling Bee were antioxidant, oxidant and oxidation. The Fight Over the Debt Limit 2023-04-27T04:00:00Z The “main ingredients” to generate air pollution are volatile organic compounds, oxidants and sunlight, Sullivan said. If you can smell your air freshener, you might have a problem 2023-02-22T05:00:00Z “You have oxidant in the soil, oxygen in the atmosphere, and plenty of microbes that love to eat this hydrogen,” he says. Hidden hydrogen: Earth may hold vast stores of a renewable, carbon-free fuel 2023-02-15T05:00:00Z For an oxidant like ozone to bleach brown carbon, ozone needs to penetrate and mix within the smoke particles. Wildfire smoke may warm the Earth for longer than we thought 2022-11-13T05:00:00Z Within the cell, fuel and oxidant undergo the same redox chemistry as when they are combusted, but via a catalyzed electrochemical that is significantly more efficient. Chemistry 2019-02-14T00:00:00Z Finally, ultraviolet light and an oxidant create “free radicals” that fly around and destroy any viruses or chemical compounds that manage to make it through, slicing through them like a machete. In face of recurring drought, cities seek security in wastewater recycling projects 2022-07-17T04:00:00Z Many fragrant molecules react to oxidants, such as those released from gas stoves. If you can smell your air freshener, you might have a problem 2023-02-22T05:00:00Z When these reductants get together with other chemicals called oxidants, they react, he explained. Europa Clipper: Nasa's ocean world mission gets launch date 2021-02-11T05:00:00Z When smoke particles become viscous, the oxidants take an extremely long time to mix — over a year in some cases. Wildfire smoke may warm the Earth for longer than we thought 2022-11-13T05:00:00Z Negative values for electrode potentials are simply a consequence of assigning a value of 0 V to the SHE, indicating the reactant of the half-reaction is a weaker oxidant than aqueous hydrogen ions. Chemistry 2019-02-14T00:00:00Z The electrically neutral radical is converted back to Mes-Acr+ by an oxidant for subsequent catalytic cycles. Strong chemical reducing agents produced by light 2020-03-31T04:00:00Z Supposedly, oxidants — or “free radicals” — are running rampant in our cells, damaging all they touch. Perspective | Five myths about aging 2019-09-20T04:00:00Z The effects of VOC mixtures on SOA formation in the real atmosphere, where concentrations of oxidants and relevant chemical species are lower but reaction times are longer, should now be investigated. Atmospheric reaction networks affecting climate are more complex than was thought 2019-01-29T05:00:00Z How does this system function during other disorders, such as inflammation and cancer, which are also characterized by oxidant stress? Metabolism reprogrammed by the nitric oxide signalling molecule 2018-11-27T05:00:00Z By definition, E°cell is positive when E°cathode > E°anode, and so any redox reaction in which the oxidant’s entry is above the reductant’s entry is predicted to be spontaneous. Chemistry 2019-02-14T00:00:00Z Industry uses it as rocket fuel and a ‘green’ oxidant — for example, for treating wastewater and bleaching pulp and paper. Two centuries since discovery of dawn-of-life molecule 2018-07-10T04:00:00Z Self-evidently, the design they propose requires both fuel and oxidant to be solid. A rocket that devours itself 2018-05-31T04:00:00Z That radiation creates powerful oxidants that would likely destroy any living cells. Life clings on in the driest corners of the Earth 2018-03-01T05:00:00Z However, it remains an unsolved problem in catalysis, as typically it involves expensive1,2,3,4 or corrosive oxidants or reaction media5,6,7,8 that are not amenable to commercialization. Mild oxidation of methane to methanol or acetic acid on supported isolated rhodium catalysts 2017-11-28T05:00:00Z The entry for the putative oxidant, Fe2+, appears above the entry for the reductant, Cr, and so a spontaneous reaction is predicted per the quick approach described above. Chemistry 2019-02-14T00:00:00Z The effects of inhaling reactive gases and oxidants, such as ozone and NOx, and their influence on the surface properties and toxicity of fine particles should be explored. Chemists can help to solve the air-pollution health crisis The middle of the cylinder is filled with a powdered mixture of ammonium perchlorate and ammonium nitrate, the oxidants. A rocket that devours itself 2018-05-31T04:00:00Z Wadsworth’s research was driven by the discovery of powerful oxidants known as perchlorates in the Martian soil some years back. Mars covered in toxic chemicals that can wipe out living organisms, tests reveal 2017-07-06T04:00:00Z On Earth, biology exploits the chemical reactions between oxidants and compounds known as reductants to supply the energy needed for life. Europa: Our best shot at finding alien life? - BBC News 2017-03-23T04:00:00Z For disproportionation reactions, the same substance functions as an oxidant and a reductant. Chemistry 2019-02-14T00:00:00Z The Phoenix lander in 2008 found the chemical perchlorate, an oxidant that might explain the sterile surface. NASA’s 1976 Viking mission to Mars did everything right — except find Martians 2016-06-18T04:00:00Z The distinction between rockets and jets is that rockets carry their own oxidant, as well as fuel, whereas jets use oxygen from the atmosphere for the purpose. SABRE-rattling 2015-11-05T05:00:00Z Writing in Scientific Reports, the researchers say that the inhospitable conditions on Mars are caused by a “toxic cocktail of oxidants, iron oxides, perchlorates and UV irradiation.” Mars covered in toxic chemicals that can wipe out living organisms, tests reveal 2017-07-06T04:00:00Z Once in the ocean, oxidants could react with reductants made by seawater reacting with the rocky ocean floor. Europa: Our best shot at finding alien life? - BBC News 2017-03-23T04:00:00Z If so, provide a more specific name for the reaction if appropriate, and identify the oxidant and reductant. Chemistry 2019-02-14T00:00:00Z “The ice has oxidants and the sediments have reductants, and life evolves to fill the gap—the free energy gap.” Earthly Extremophiles Prompt Speculation about Alien Life 2015-02-03T05:00:00Z For most Americans who drink coffee, it provides more antioxidants than any other food, according to Joe Vinson, a chemistry professor at the University of Scranton. Coffee may be able to lengthen your life and lower your risk of depression 2015-01-16T05:00:00Z The company treated contaminated groundwater with a chemical oxidant in March. Whirlpool releases report on Arkansas site 2014-11-20T05:00:00Z However, the oxidants made on the surface are only useful to Europan microbes if they can get down into the ocean. Europa: Our best shot at finding alien life? - BBC News 2017-03-23T04:00:00Z Aqueous phase redox processes often involve water or its characteristic ions, H+ and OH−, as reactants in addition to the oxidant and reductant, and equations representing these reactions can be challenging to balance. Chemistry 2019-02-14T00:00:00Z What makes this possible is that Europa seems to be geologically active, allowing these supplies of fuel and oxidants to be transported, mixed and constantly renewed. Earthly Extremophiles Prompt Speculation about Alien Life 2015-02-03T05:00:00Z The fructose then gets metabolized by another enzyme, fructokinase, to produce oxidants that cause inflammation and scarring that may be the basis for the illness. The Riddle of What Is Killing Thousands of Central American Cane Workers 2014-02-12T16:43:47Z "You produce lots of oxidants in the brain when you're working," she says. It's True: You Are What You Eat 2013-06-27T15:00:00Z That said, this radiation also drives reactions on Europa's surface, yielding chemicals called oxidants. Europa: Our best shot at finding alien life? - BBC News 2017-03-23T04:00:00Z The generation and buildup of harmful oxidants is thus more likely to occur. Readers Respond to "The Myth of Antioxidants" 2013-06-14T14:15:00.310Z We note that 20 hours of photochemical aging corresponds to ~2 days of actual time in regions where OH is the primary oxidant. [Technical Response] Response to Comment on "Radiative Absorption Enhancements Due to the Mixing State of Atmospheric Black Carbon" 2013-01-24T20:55:18.720Z Perchlorates are oxidants and at the time of Phoenix it was suggested they could be reacting with - and destroying - complex organics as the lander's instrumentation heated its samples. Rover's big lab up and running 2012-12-04T02:50:53Z Potassium perchlorate, an essential oxidant in many fireworks, is under scrutiny by the US Environmental Protection Agency because it promotes thyroid dysfunction and causes birth defects. Green Fireworks Environmentally Safe, That is 2012-07-04T19:15:08.040Z Instead, like in naked mole rats, it may be the integrity of the animal's proteins that may be the key, rather than damaging free radicals or anto oxidants used to defend against them. Forever young 2011-06-02T00:15:32Z “Driving this chemistry,” Robinson notes, “was hydroxyl radical,” or OH—the oxidant that’s most effective at catalyzing the breakdown of oily hydrocarbons. Idling Jets Pollute More Than Thought 2011-05-11T15:10:00Z The process of neutralizing such oxidants temporarily changes the chemical structure of the peroxiredoxin, which then reverts to its native state again - thus the molecule is constantly switching between the two states. Circadian clock without DNA--History and the power of metaphor 2011-02-11T16:15:02.303Z The reaction uses O2 as oxidant and proceeds in the absence of solvent. This Week in Science 2011-01-13T19:25:00.650Z It produces electricity through a chemical reaction between that incoming fuel and an oxidant in the presence of an electrolyte. What Bloom Energy Needs To Prove 2010-02-24T11:00:00Z Weak oxidants may also be used as bleaching agents to remove coloured by-products without seriously attacking the ligno-cellulose, which is obtained in its bleached form. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 5 "Cat" to "Celt" It may also be treated with dilute oxidants. Researches on Cellulose 1895-1900 This, however, is obviously a question of conditions: this group of oxidants also oxidize to oxycellulose, and under more severe conditions to acid products, e.g. oxalic and carbonic acids. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 5 "Cat" to "Celt" |
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