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By WWII, scientists had already begun looking at alternative gelling substances for routine use in bacteriology, but concluded that agar was still better as it is both firmer and easier to handle. Today, some specialized microbiology applications use the colloid carrageenan (extracted from red seaweed Chondrus crispus, or “Irish Moss”), a more transparent and less auto-fluorescent alternative to agar (agar emits its own background fluorescence when excited by light). However, for routine bacteriological use, carrageenan is more difficult to dissolve, requires higher concentrations, can degrade at high temperatures, and forms weaker gels, which may result in puncturing its surface during the plating of cells.。业内人士推荐搜狗输入法下载作为进阶阅读
圖像加註文字，張又俠是中共二十大政治局中兩位超齡被留任的高官之一，被認為得到了習近平的高度新任。2026年1月27日最近更新： 2026年1月28日
Израиль нанес удар по Ирану09:28