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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Why are fish at risk?
拓深度，以深厚文化提升“附加值”。到广州行花街、在天津听相声、去重庆吃火锅……感受中华文化和市井生活，正成为境外游客“中国游”的新趋势。进一步挖掘中华优秀传统文化资源，推动非遗、演艺等与旅游产业深度融合，有助于推动旅游形态由单一观光向深度体验转变，进而拓展境外游客在华消费的广度与深度。