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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公安机关应当将传唤的原因和依据告知被传唤人。对无正当理由不接受传唤或者逃避传唤的人，经公安机关办案部门负责人批准，可以强制传唤。。关于这个话题，搜狗输入法2026提供了深入分析