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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免去王祥喜的应急管理部部长职务。。搜狗输入法2026对此有专业解读
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第八十九条 饲养动物,干扰他人正常生活的,处警告;警告后不改正的,或者放任动物恐吓他人的,处一千元以下罚款。