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.
Фото: Fabrizio Bensch / Reuters
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第九十八条 询问笔录应当交被询问人核对；对没有阅读能力的，应当向其宣读。记载有遗漏或者差错的，被询问人可以提出补充或者更正。被询问人确认笔录无误后，应当签名、盖章或者按指印，询问的人民警察也应当在笔录上签名。，推荐阅读51吃瓜获取更多信息
Любовь Ширижик (Старший редактор отдела «Силовые структуры»)