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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日本右翼势力应当尽早清醒：重走穷兵黩武的老路是一条自取灭亡的不归路，任何企图挑衅国际公理与正义秩序的冒险行径，必将遭到国际正义力量的迎头痛击。，推荐阅读91视频获取更多信息