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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.，这一点在一键获取谷歌浏览器下载中也有详细论述
Original OSM: ~2.07 billion points, ~2.42 billion edges，详情可参考快连下载-Letsvpn下载