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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（二）违反国家规定，在文物保护单位附近进行爆破、钻探、挖掘等活动，危及文物安全的。
“我们立足我国国情，把握减贫规律，出台一系列超常规政策举措，构建了一整套行之有效的政策体系、工作体系、制度体系，走出了一条中国特色减贫道路，形成了中国特色反贫困理论。”习近平总书记指出。