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.
把握“显绩”和“潜绩”，牢牢树立正确政绩观，让发展成果真正惠及亿万农民。
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国务院其他有关部门在各自职责范围内负责有关原子能研究、开发和利用活动的管理和监督工作。