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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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2 January 2026ShareSave
Maggie 姐与手下的妈咪（左）在新花都。这位妈咪来自四川，在香港打拼了十年（图：南方人物周刊记者 方迎忠）