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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.。搜狗输入法2026对此有专业解读
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很多加盟商都有一个创牌梦。如今正是创新时代，创牌恰逢其时。但一定要记住：未来五年，要做“百店小王子”，不要盲目追求千店、万店——普通人很难与资本抗衡，盲目扩张只会得不偿失。