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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.。业内人士推荐爱思助手下载最新版本作为进阶阅读
The government spending covers legal advice and staffing costs – at last count a team of 248 were working across key departments to produce evidence for the inquiry.，这一点在safew官方版本下载中也有详细论述