• In eighteen ninety-seven, a chemist named Felix Hoffmann at Friedrich Bayer and Company in Germany created acetyl salicylic acid.

    VOA: special.2009.10.20

  • So just keep in mind when you do see the chlorine in these drugs, it's very different from the acid chloride.

    因此只要记住当你在这些药物中发现氯的时候,它不会是酰氯就好了。

    麻省理工公开课 - 化学原理课程节选

  • They're derived from a precursor called triacylglyceride, which is as glycerol molecule with three fatty acid chains dangling off of it.

    它们来源于一种叫三酰甘油的前体,由甘油分子上连接了,三个脂肪酸链构成

    耶鲁公开课 - 生物医学工程探索课程节选

  • But Mister Zundt says reducing air pollution and acid rain will reduce respiratory illnesses for people in the city.

    VOA: special.2009.09.07

  • And they wanted to use a soluble salt of citric acid, so they could have used sodium, they could have used potassium.

    而且他们想用一种柠檬酸的可溶性盐,他们本可以用钠,也可以用钾。

    麻省理工公开课 - 化学原理课程节选

  • The experts said women who wish to become mothers should take folic acid to prevent problems in their babies.

    VOA: special.2009.04.21

  • You know, you mix acid and base together and the thing heats up like crazy, right.

    你知道,当你把酸和碱混合起来时,这东西会像疯了一样地变热。

    麻省理工公开课 - 热力学与动力学课程节选

  • We stopped in the afternoons to fish for a few minutes in little rivers turned black by the acid of cypress trees.

    VOA: special.2010.01.30

  • HF And let's take an example, HF, hydrofluoric acid, all right?

    这里有个例子,氢氟酸,对吧?

    麻省理工公开课 - 固态化学导论课程节选

  • At the same time, doctors warn that acid in aspirin can cause bleeding in the stomach and intestines.

    VOA: special.2009.10.20

  • Fatty acid chains are fat molecules, they behave, if you have a lot of them in solution like oil.

    脂肪酸链就是脂肪分子,它们看上去好像,如果你见过富含脂类的溶液,比如油

    耶鲁公开课 - 生物医学工程探索课程节选

  • Domoic acid can also cause neurological disorders and death in animals that eat fish poisoned with the neurotoxin.

    VOA: special.2011.03.15

  • And what it's used is to convert one type of group, what's called a carboxylic acid into another type of very reactive intermediate, which is called an acid chloride.

    它被用来将一类被称作羧酸的化合物,转化成另外一类活性很高的反应中间体,也就是酰氯。

    麻省理工公开课 - 化学原理课程节选

  • Boric acid has been used to kill other insects including cockroaches, termites and ants inside homes since the middle of last century.

    VOA: special.2011.02.23

  • They have two fatty acid chains and so these are the oily like parts of the molecule, the molecules that behave like oil.

    它们含有两条脂肪酸链,这是部分分子具有油脂的属性,使磷脂分子具有油脂的属性

    耶鲁公开课 - 生物医学工程探索课程节选

  • "It contributes to smog,acid rain, loss of biodiversity, dead zones along the coast, global warming, stratospheric ozone depletion.

    VOA: special.2011.04.05

  • So I show that here, so in green, you have what's called a carboxcylic acid group, a c o o h, which gets converted by s o c l 2 to a c double bond o c l or an acid chloride.

    我在这里用绿色表示,我们所说的羧酸族化合物,碳,氧,氧,氢,它被亚硫酰氯转化为,一个碳氧双键与碳氯单键组成的酰氯。

    麻省理工公开课 - 化学原理课程节选

  • Soil should also be tested for its pH level, a measure of the acid and alkaline balance.

    VOA: special.2009.06.09

  • And then linked to the glycerol instead of a third fatty acid chain is a water soluble molecule, like a salt.

    但连到甘油上的第三个基团不是脂肪酸链,而是一种水溶性的分子,像盐一样

    耶鲁公开课 - 生物医学工程探索课程节选

  • Later,the water and most of the acid left the caves as the Guadalupe Mountains continued to rise.

    VOA: special.2009.12.07

  • She needs to know this enzyme works by both acid base chemistry, and oxidation reduction.

    她要知道酶催化,她需要知道这种酶,在酸碱环境下的反应和氧化还原反应。

    麻省理工公开课 - 化学原理课程节选

  • Yet,it took some time for the team to confirm that the amino acid glycine came from space.

    VOA: special.2009.09.30

  • Proteins are only susceptible to phosphorylation if they have certain kinds of amino acid sequences.

    只有含这些氨基酸的蛋白质,才能够被磷酸化

    耶鲁公开课 - 生物医学工程探索课程节选

  • Scientists are testing bone from Nikumaroro to learn if DNA, deoxyribonucleic acid, can be recovered from it.

    VOA: special.2011.01.18

  • One of them has the right sequence of codons to specify the amino acid sequence of the protein, and the other one has a complimentary sequence.

    该段带有正确的密码子序列,能够指导氨基酸序列合成蛋白质,另一段则是它的互补序列

    耶鲁公开课 - 生物医学工程探索课程节选

  • But it is the first time an amino acid has been discovered on a comet.

    VOA: special.2009.09.30

  • They would naturally hybridize and form a duplex, or a double stranded nucleic acid.

    它们会自然杂交并形成双螺旋,或者说双链核酸

    耶鲁公开课 - 生物医学工程探索课程节选

  • Then they made small changes to the bacterium's deoxyribonucleic acid -- DNA for short.

    VOA: special.2010.07.20

  • They bring into proximity an amino acid so that instead of forming a new polymer of a nucleic acid, a polymer of an amino acids is formed.

    同时它所携带氨基酸相互邻接,从而形成了一个氨基酸聚合物,而非核酸聚合物

    耶鲁公开课 - 生物医学工程探索课程节选

  • In the eighteen hundreds, researchers discovered how to make salicylic acid from the chemical.

    VOA: special.2010.12.14

词组短语

amino acid n. [化]氨基酸

acetic acid [化]醋酸,乙酸

sulfuric acid 硫酸

fatty acid [化]脂肪酸

lactic acid 乳酸

phosphoric acid [化]磷酸

acrylic acid 丙烯酸

hydrochloric acid 盐酸

citric acid 柠檬酸

nitric acid [化]硝酸

sulphuric acid 硫酸

acid rain 酸雨

hyaluronic acid [生化]透明质酸;玻璃酸

organic acid 有机酸

nucleic acid [生化]核酸

benzoic acid [化]苯甲酸

acid solution [化]酸溶液

lactic acid bacteria 乳酸菌

acid content 酸性含量

oxalic acid [化]草酸

  更多收起词组短语
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