The aflatoxin B1 is one of the most toxic mycotoxin in the natural world . The international organizations take it as 10 000 times as basic toxin unit comparing to other materials .

黄曲霉毒素B1（ aflatoxinB1，AFB1）是黄曲霉毒素中毒性最强的一种毒素，国际上以黄曲霉 毒素的毒性作为10000的基准，来比较其它物质的 毒性。

The activity of toxin hydrolyzing 1 ng of NAD was defined as a unit then 207 ng of the toxin used in the reaction had 250 units .

定义分解1ngNAD的 毒素活性为一个 单位，则207ng毒素含有250个 毒素 活性单位。

Gene cloning and high expression of clostridium difficile toxin A C-terminal repeated unit

艰难 梭菌 毒素A羧基端基因的克隆与表达