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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.
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Украинский лидер в интервью Sky News заявил, что с удовольствием принял бы ядерное оружие от Франции или Британии. Однако, по его словам, Киеву не поступали такие предложения.
新时代，中国考古学应坚守田野发掘与研究阐释并重，推动传统考古学与自然科学、大数据及人工智能的深度融合。以中华大地上持续出土的丰富材料为基础，更多研究成果将为增强文化自信、赓续中华文脉、讲好中国故事贡献考古学力量。