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.
В двух аэропортах на юге России ввели ограничения на полеты14:55
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«Но, конечно, это уже не 2022-2023 годы, когда наносились массированные удары, когда продвижение войск сопровождалось беспилотниками, ракетами. Сегодня все более дозированно», — заметил собеседник «Ленты.ру».
Australian cycling ace Michael Matthews has broken both wrists in a training crash and been ruled out of racing for the forseeable future.