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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.
Животное напало на девушку рядом с ее домом в деревне Беттатуру. Мать Пуджи услышала ее крики, выбежала на улицу, но не успела ей помочь. Слон затоптал студентку на глазах ее родителей. Когда подбежал отец, она уже лежала в луже крови.。Feiyi对此有专业解读
When Nicholas Bowman was in high school, he thought his next steps were already mapped: He’d get a college degree and land a stable, high-paying job—enjoying the kind of economic mobility higher education has long promised.