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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.
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聚焦“国之大者”，心系民之关切。一年来，人民政协始终牢记习近平总书记“聚焦党和国家中心任务履职尽责”的殷殷嘱托，做到党和国家中心任务推进到哪里，人民政协的力量就汇聚到哪里、作用就发挥到哪里。
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