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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Трамп высказался о непростом решении по Ирану09:14
Гангстер одним ударом расправился с туристом в Таиланде и попал на видео18:08
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他透露，将致力于打造百分之百的新能源游艇，并希望未来能带动行业造出 10 万元级别的游艇，「让游艇像汽车一样进入千家万户。」
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