Agar was first introduced into the laboratory in 1881. Since then, microbiologists have depended on agar to create strong jellies. When microorganisms are streaked or plated onto this jellied surface and incubated, individual cells multiply into distinct colonies that scientists can easily observe, select, and propagate for further experiments. Many of the most important findings in biological research of the last 150 years or so — including the discovery of the CRISPR/Cas9 gene-editing tool — have been enabled by agar.4 Agarose, a derivative of agar, is also essential in molecular biology techniques like gel electrophoresis, where its porous gel matrix separates DNA fragments by size, enabling researchers to analyze and isolate specific genetic sequences.
国务院有关部门对放射性物品运输企业和运输过程实行严格监督和管理。
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（四）本社区三分之一以上居民代表或者十分之一以上的居民要求审计的其他事项。
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（一）非法种植罂粟不满五百株或者其他少量毒品原植物的；
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