| 单词 | carboxylic acid |
| 例句 | They also tweaked a carboxylic acid group at the bottom of the molecule, speeding up how quickly the antifungal removed ergosterols. New antifungal kills without toxic side effects 2023-11-08T05:00:00Z As has been found in previous studies, more mosquitoes seemed to prefer people whose scent contained a blend of carboxylic acids, the oily secretions that hydrate and protect our skin. World’s largest ‘scent arena’ reveals bloody preferences of mosquitoes 2023-05-18T04:00:00Z The study found that people like subject 33, who have higher levels of compounds called carboxylic acids on their skin, are more likely to be “mosquito magnets,” Vosshall said. Are you a mosquito magnet? It’s because of how you smell. 2022-10-18T04:00:00Z They found a pattern: the most attractive subjects tended to produce greater levels of carboxylic acids from their skin while the least attractive subjects produced much less. Some People Really Are Mosquito Magnets, and They’re Stuck That Way 2022-10-18T04:00:00Z Amines and carboxylic acids can combine in a condensation reaction to form amides. Chemistry 2019-02-14T00:00:00Z The carboxylic acid carbon, O = C – OH, of one amino acid can form a bond with the amine, NH2, of another amino acid. Biology for AP Courses 2022-06-09T00:00:00Z Two of those carboxylic acids are also found in Limburger cheese, McMeniman notes, a known lure for mosquitoes. World’s largest ‘scent arena’ reveals bloody preferences of mosquitoes 2023-05-18T04:00:00Z All humans produce carboxylic acid through sebum, a waxy coating, on their skin. Are you a mosquito magnet? It’s because of how you smell. 2022-10-18T04:00:00Z Humans release carboxylic acids at much higher levels than most animals, De Obaldia adds, though the amount varies from person to person. Some People Really Are Mosquito Magnets, and They’re Stuck That Way 2022-10-18T04:00:00Z In a carboxylic acid, the second oxygen atom also bonds to a hydrogen atom. Chemistry 2019-02-14T00:00:00Z Compounds used in flame retardants and batteries, for example, contain a sulfonate group instead of a carboxylic acid group and won’t break down with this approach. Simple mix of soap and solvent could help destroy ‘forever chemicals’ 2022-08-17T04:00:00Z In the current paper, Chen and colleagues use carboxylic acids as a link that allows them to combine RCC and Diels–Alder reactions. Reaction combination opens up 3D molecular diversity for drug discovery 2018-08-05T04:00:00Z The sebum is then eaten by the millions of beneficial microorganisms that colonize our skin to produce more carboxylic acid. Are you a mosquito magnet? It’s because of how you smell. 2022-10-18T04:00:00Z But we do know that skin maintains a relatively constant level of carboxylic acids over time. Some People Really Are Mosquito Magnets, and They’re Stuck That Way 2022-10-18T04:00:00Z The hydrogen atom in the functional group of a carboxylic acid will react with a base to form an ionic salt: Chemistry 2019-02-14T00:00:00Z The carboxylic acid produced by the hydrolysis could break down electronic materials too. Self-Destructing Circuits Mimic Mission: Impossible Tape 2017-09-08T04:00:00Z Hydrolysis of an ester forms carboxylic acid and alcohol. 3 Challenging Sample MCAT Questions on Organic Chemistry 2014-09-23T04:00:00Z The study didn’t answer why some people have more carboxylic acids on their skin than others. Are you a mosquito magnet? It’s because of how you smell. 2022-10-18T04:00:00Z He adds that the study’s identification of specific carboxylic acids as a key determinant of mosquito attraction is a new contribution to biologists’ understanding of the insects’ behavior. Some People Really Are Mosquito Magnets, and They’re Stuck That Way 2022-10-18T04:00:00Z Generally only about 1% of the molecules of a carboxylic acid dissolved in water are ionized at any given time. Chemistry 2019-02-14T00:00:00Z Conine, on oxidation, yields chiefly butyric acid, but among the products of oxidation has been found the pyridine carboxylic acid before referred to. Scientific American Supplement, No. 415, December 15, 1883 Hydrolysis of an ester forms carboxylic acid and alcohol. 3 Challenging Sample MCAT Questions on Organic Chemistry 2014-09-23T04:00:00Z LJ Zwiebel, a professor at Vanderbilt University who was not involved in the research, said that while carboxylic acids are clearly implicated in the study, there’s no “single compound” that attracts mosquitoes. Are you a mosquito magnet? It’s because of how you smell. 2022-10-18T04:00:00Z Still, one question remains: Why do mosquitoes love the smell of carboxylic acids or their attendant bacteria so much? Some People Really Are Mosquito Magnets, and They’re Stuck That Way 2022-10-18T04:00:00Z We prepare carboxylic acids by the oxidation of aldehydes or alcohols whose –OH functional group is located on the carbon atom at the end of the chain of carbon atoms in the alcohol: Chemistry 2019-02-14T00:00:00Z Since they are both carboxylic acids, they each contain the –COOH functional group and its characteristics. Chemistry 2019-02-14T00:00:00Z The products are a carboxylic acid and an alcohol. 3 Challenging Sample MCAT Questions on Organic Chemistry 2014-09-23T04:00:00Z The carboxylic acids are “one significant component but not the only one.” Are you a mosquito magnet? It’s because of how you smell. 2022-10-18T04:00:00Z So, De Obaldia says, mosquitoes probably grew to love carboxylic acids because they’re an excellent indicator that the insects have located a human. Some People Really Are Mosquito Magnets, and They’re Stuck That Way 2022-10-18T04:00:00Z The reaction between amines and carboxylic acids to form amides is biologically important. Chemistry 2019-02-14T00:00:00Z The common feature of amino acids is that they contain the functional groups: an amine group, –NH2, and a carboxylic acid group, –CO2H. Chemistry 2019-02-14T00:00:00Z The odor of ripe bananas and many other fruits is due to the presence of esters, compounds that can be prepared by the reaction of a carboxylic acid with an alcohol. Chemistry 2019-02-14T00:00:00Z Both carboxylic acids and esters contain a carbonyl group with a second oxygen atom bonded to the carbon atom in the carbonyl group by a single bond. Chemistry 2019-02-14T00:00:00Z Every person has a unique scent profile made up of different chemical compounds, and the researchers found that mosquitoes were most drawn to people whose skin produces high levels of carboxylic acids. Some People Really Are Mosquito Magnets, and They’re Stuck That Way 2022-10-18T04:00:00Z Fatty acids are carboxylic acids that have long hydrocarbon chains attached to a carboxylate group. Chemistry 2019-02-14T00:00:00Z Amides can be produced when carboxylic acids react with amines or ammonia in a process called amidation. Chemistry 2019-02-14T00:00:00Z |
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