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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增长的原因，一方面是上市企业新陈代谢，部分退市，以及IPO带来新鲜血液。另一方面是越来越多企业开始投入研发，并主动披露研发相关数据。
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它的本质，是“社区主导+专业管理”的结合——既有居民的参与和认同，又有专业医疗体系的支撑，最终实现了“老人在社区，就能享受到优质医疗服务”的目标。