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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.，这一点在服务器推荐中也有详细论述
前款所称的备案制度，由国务院公安部门会同电信等主管部门作具体规定。。业内人士推荐旺商聊官方下载作为进阶阅读
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