Before agar, microbiologists had experimented with other foodstuffs as microbial media. They turned to substances rich in the starches, proteins, sugars, fats, and minerals that organisms need for growth, testing with broths, bread, potatoes, polenta, egg whites, coagulated blood serums, and gelatine. However, none worked particularly well: all were easily broken down by heat and microbial enzymes, and their surface, once colonized, became mushy and unsuitable for isolating microbes.
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Украинский лидер Владимир Зеленский заявил, что готов встретиться с главой РФ Владимиром Путиным. Об этом он упомянул в интервью Sky News.。WPS官方版本下载是该领域的重要参考
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‘Overall we are moving in the right direction’
2月13日傍晚，在上海科技馆附近，我们乘坐一辆无人驾驶的出租车。南方周末记者 黄思卓/摄，推荐阅读safew官方版本下载获取更多信息