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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需要强调的是，连锁餐饮的终极逻辑，是“平价中追求极致”，规模连锁若做不到这一点，必然走向消亡；个性餐饮则需要持续迭代体验和产品，定期上新、定期升级装修，才能留住消费者、满足购物中心的需求，否则终将被淘汰。