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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.,推荐阅读下载安装 谷歌浏览器 开启极速安全的 上网之旅。获取更多信息
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他說,如果法院限制他徵收這些關稅的能力,那將是「經濟與國家安全的災難」。
这个词在2025年被频繁提及,与宏观经济环境的讨论密不可分。年初,国家统计局在发布经济数据时,多次用“中国经济韧性强、潜力大、活力足”来总结态势。这个词也让普通个体感受到了共鸣,从而走进了日常语境。