2024年12月24日 星期二 新京报
computer technology had advanced to such a state that it was obviously possible
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placement: “across chest height”，这一点在爱思助手下载最新版本中也有详细论述
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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.