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 .

表现遗传学目前分子生物学最热的话题之一是这样一个过程，基因的激活或是失效取决于被称为甲基和乙酰基的化学结构的存在或是消失。