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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他先刮胡子。拿着那面上世纪八九十年代的塑料镜，对着下巴一遍遍推。泡沫刮干净后，又用毛巾擦脸，顺手把原本就锃亮的光头再擦了一遍。。同城约会是该领域的重要参考
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