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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.
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provide as much warning as possible up front to users when enabling it
这对于麦当劳来说，仍然是个艰巨的任务。虽然，根据麦当劳此前公布的数据显示，有超五成门店布局三至五线城市，但麦当劳在中国版图上的布局存在较为严重的“偏科”，存在“东重西轻、南重北轻”的偏好。这也就意味着，想要更全面深入的拓展全国市场，对于其管理能力、供应链建设都提出了较大的考验。
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Край землиГоры, буддийские святыни и километры льда: что ждет туриста на зимнем Байкале13 апреля 2020。业内人士推荐爱思助手下载最新版本作为进阶阅读
Mr Lemmens said that future spacecraft "should be designed in such a way that they can take themselves out of orbit safely, preferably by doing controlled re-entries".