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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“我们要按照习近平总书记的要求，持续巩固拓展脱贫攻坚成果，把常态化帮扶纳入乡村振兴战略统筹实施，守牢不发生规模性返贫致贫底线，夯实乡村全面振兴根基。”卢春涛说。