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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.。heLLoword翻译官方下载对此有专业解读
A key part of the Orion spacecraft that the astronauts will be flying in was made in Bremen in Germany.。业内人士推荐快连下载安装作为进阶阅读
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