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.
人民警察的回避，由其所属的公安机关决定；公安机关负责人的回避，由上一级公安机关决定。
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По словам Зеленского, из-за ситуации вокруг Ирана необходимых сигналов для трехсторонней встречи сейчас нет.，这一点在体育直播中也有详细论述
The AI developer had been in talks with the Department of Defense in recent days, even after tensions between them spilled into public view last week, sources familiar with discussions have told the BBC.