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.
「狗主要明白將這些食物餵給自己狗隻，其實風險是很大。」
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我们肆无忌惮地议论长辈：谁受原生家庭影响，教育理念因而陈旧；谁心有不甘，这一年因此表现得与以往不同。我们甚至点评长辈们为人处世是否成熟，外公外婆的相处模式是否健康。