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

VOA: special.2009.09.07

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

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

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

VOA: special.2009.04.21

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

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

That's because every three base pairs describes an amino acid in a protein.

那是因为每三个碱基对,对应一个蛋白质中的一个氨基酸

耶鲁公开课 - 生物医学工程探索课程节选

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

VOA: special.2009.10.20

So, if you look in the blood of patients that are infected with Hepatitis B you find a lot of Hepatitis B surface subunits, proteins without the nucleic acid circulating in their blood.

因此,如果你观察一下,已经感染乙肝病毒患者的血液,你会发现许多乙肝病毒的表面亚基,以及血液循环中存在没有核酸的蛋白质

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

If I drew this altogether and this is one particular nucleic acid, now shown in more detail, all of the carbons of the pentose are shown here, the phosphate is shown, and a base is shown.

如果我把这个放在一起,这个核酸分子,让你们看得到更多细节,戊糖的五个碳都在这儿,磷酸基在这儿,碱基在这儿

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

I just wanted to point out that although you see these chlorine atoms in these drugs, in fact, I don't think I've ever seen an acid chloride in a final pharmaceutical product or drug that we take, and the reason is because they're so reactive that you wouldn't want to have that in something you digest.

我只是想指出一点,那就是尽管你在这些药物中看到了氯原子，实际上，我想我从来都没有在一个,成品的药用产品或者药物中见到过酰氯，这原因是因为它们太容易反应了,你不会想让它们出现在你要消化的东西中。

麻省理工公开课 - 化学原理课程节选

Breast milk can help slow bacterial growth and acid production in the mouth.

VOA: special.2009.03.11

That creates a problem in the genetic code in that there's 64 possible sequences but there's only 20 some amino acids, so each amino acid can be specified by more than one codon.

这里有个问题,遗传密码有六十四种可能的序列,而只有二十种氨基酸,因此每种氨基酸都有,不止一种密码子与之对应

耶鲁公开课 - 生物医学工程探索课程节选

High levels of domoic acid in the sardines may have worsened the effects of oxygen loss in the water as the fish crowded into a limited space.

VOA: special.2011.03.15

DNA methylation shows chemical changes in a person's deoxyribonucleic acid,or DNA.

VOA: special.2009.11.24

"In the observational studies we found that some of the B vitamins, like folic acid,were beneficial."

VOA: standard.2010.06.17