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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违反有关法律、法规、规章规定，出售、饲养烈性犬等危险动物的，处警告；警告后不改正的，或者致使动物伤害他人的，处五日以下拘留或者一千元以下罚款；情节较重的，处五日以上十日以下拘留。。搜狗输入法2026对此有专业解读
During the ”snowball Earth” period about 700m years ago, Earth’s climate shut down. The planet was encased in ice and insulated from seasonal variations: spring, summer, autumn and winter all stopped. Or at least that was the theory.