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.
（一）原值不超过500万元的单项长期资产，对应的进项税额可以全额从销项税额中抵扣；
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Gene Munster, manager partner at Deepwater Asset Management, said that buildout was likely to continue for a long time.