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Breast milk can help slow bacterial growth and acid production in the mouth.
VOA: special.2009.03.11
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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
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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。
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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
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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。
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Domoic acid can also cause neurological disorders and death in animals that eat fish poisoned with the neurotoxin.
VOA: special.2011.03.15
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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
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At the same time, doctors warn that acid in aspirin can cause bleeding in the stomach and intestines.
VOA: special.2009.10.20
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HF And let's take an example, HF, hydrofluoric acid, all right?
这里有个例子，氢氟酸，对吧？
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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
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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。
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Soil should also be tested for its pH level, a measure of the acid and alkaline balance.
VOA: special.2009.06.09
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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。
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Later,the water and most of the acid left the caves as the Guadalupe Mountains continued to rise.
VOA: special.2009.12.07
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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
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During pregnancy some of the women received supplements containing iron and another micronutrient,folic acid.
VOA: special.2011.01.05
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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
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Most of the data comes from the industrialized world. Not surprisingly, burning fossil fuels for transportation and electrical generation top the list for their contributions to climate change, acid rain and toxic pollution.
VOA: standard.2010.06.04
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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
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I wrote this son, my father and I wrote this song, for the acid victims of Kandahar City -- a few young girls who were trying to make their way home from school when they got attacked by acid.
VOA: standard.2010.03.08
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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。
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The fascinating part about this layer is that it solves the problem for phospholipids about how to exist in water when half of you wants to be in oil, and that the water soluble part of the top leaflet here, of the top points up into the water, and the fatty acid chains point down.
这层膜的迷人之处在于,它解决了磷脂,如何存在于水中和油脂中的问题,水溶性的顶端部分,向上插入水中,而脂肪链则指向下
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