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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.。同城约会对此有专业解读
圖像加註文字,香港新規例不欲允許餐廳給寵物犬現煮食物。據香港政府統計處數字,14.75萬戶養狗居民合共飼養22.11萬隻狗;85%住戶居於私人房屋;住戶每月入息中位數3.63萬,當中44%每月入息達4萬元或以上。這說明養狗居民具備一定的消費能力。