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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Always consider the chat group’s purpose. For those created with a specific and practical function in mind, just stick to the task and don’t post any more than you need to, Wesson said.，这一点在Line官方版本下载中也有详细论述
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