Photograph: Simon Hill
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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.。im钱包官方下载是该领域的重要参考
The workers described being threatened and beaten, having their passports withheld, and being forced to work long hours in unsanitary conditions.