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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.，详情可参考同城约会
临走时，王嫂接了个电话，对方询问是否还有山姆的鲜牛奶，王嫂说已经卖完，明天会到新货。门口的塑料门帘被风掀开一下，又落下去，外面是春节里皖北城市常见的灰白天色，街边店铺的红灯笼还挂着。。搜狗输入法下载对此有专业解读
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