微克

Microgram for microgram, beryllium is one of the most toxic elements on the periodic table.

一微，又一微，周期表上最有毒的元素之一。

In this paper,the contents of herbicide bifenox weredeterminated by the differential UV spectrophotometry at 280nm,and the reference solution was that the 40.

本文采用差示紫外分光光度法，以40．0微／毫升的甲羧除草醚己烷液为参比溶液，在波长280纳米处定其含量。

A recombinant HGP44 inhibited HIV-1 replication at a 50% effective concentration of approximately 2.5 micromolar, the researchers note, somewhat less potently than did P. gingivalis extracts.

研究者重组HGP44蛋白酶在约2.5微分子的50%有效浓度时能抑制HIV-1复制，然而重组HGP44比直接从牙龈卟啉菌中提取的有效性略。