One , called tsa , inhibits the enzyme that removes acetyl groups .
一个是tsa，它可以抑制去除乙酰基的酶。
These help a mitochondrial enzyme called carnitine acetyl transferase to do its job .
这能有助于一种叫做肉碱乙酰转移酶的线粒体酶的活动。
1893 German scientists find that adding an acetyl group to salicylic acid reduces its irritant properties .
1893年，德国科学家发现给水杨酸加上一个乙酰基，这样减少了它的刺激作用。
By 1897 a synthetic derivative ( acetyl salicylic acid ) of the plant 's active ingredient ( salicin ) was created .
1897年前后，一种从植物活性原料（水杨苷）中萃取出来的一种合成衍生物（乙酰基水杨酸）被研制出来。
Epigenetics-currently one of molecular biology 's hottest topics-is a process by which genes are activated or deactivated by the presence or absence of chemical structures called methyl and acetyl groups .
