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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从摆脱贫困到巩固成果，各地抓细监测，抓实产业、就业帮扶，责任体系、政策体系、工作体系有效衔接，脱贫攻坚成果成色更足、更可持续。新时代减贫治理的实践充分证明，贫困不仅可以战胜，也可以阻断、不再复发。
但如果是早晚高峰挤广州地铁三号线的时候，倒是可以考虑打开第二档。