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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（一）典当业工作人员承接典当的物品，不查验有关证明、不履行登记手续的，或者违反国家规定对明知是违法犯罪嫌疑人、赃物而不向公安机关报告的；