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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3.监理单位未按要求派驻监理人员，监理人员数量不足，且人员不符合要求。总监工程师长期不在岗履职，未见打卡及会议签到记录；专业监理工程师一人在岗，但无社保；现场问题较多，监理形同虚设。
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再后来，那条小巷的大多数人都搬走了。我们家是最先搬走的，把房子卖了，我在外地读了几年书，又到了教育资源更好的隔壁市。很久很久没再回到县城，我与当初的小伙伴失去了联系。有人搬去了市区，有人搬进了高楼，有人去了大城市，后来听说前院的阿姨去世了。，更多细节参见safew官方下载