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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抖音渠道成就了西子健康的规模跃迁，却未必能护佑它的资本之路。站在港交所门前，更严苛的监管标准之下，资本市场认可与否，仍需打上一个问号。
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