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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重庆市委要求突出学习引领，原原本本学习习近平总书记关于树立和践行正确政绩观的重要论述，贯通学习习近平总书记视察重庆重要讲话重要指示精神，切实把学习教育成效转化为干字当头、唯实争先的精气神，为做实“两大定位”、发挥“三个作用”，加快建设“六区一高地”，奋力谱写中国式现代化重庆篇章提供有力保障。