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.
2024年12月23日 星期一 新京报
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Births in Japan fall in 2025 to 706,000, record low for 10th straight year
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It's Pokémon Day, which means you're probably seeing a ton of hype around the franchise's 30th anniversary. But before you blindly add the official commemorative TCG collection to your Amazon cart, you should know you can get it way cheaper somewhere else.