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.
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而对于所有国货美妆品牌而言，完美日记就是一面镜子：靠风口起飞，只是一时幸运。当流量潮水退去，真正能留在舞台中央的，永远是那些有产品、有品牌、有用户、有耐心的长期主义者。
They migrate thousands of kilometres to find stable sea ice during Antarctic summer to wait out what is called a "catastrophic moult" every year.