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.
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增长6.1%！2025年，我国出口顶住逆风逆流，保持增长态势。其中，高技术产品、“新三样”产品出口同比分别增长13.2%、27.1%，自主品牌产品出口增长12.9%。稳量提质的“密码”，正是源自我国推进高水平对外开放。。关于这个话题，WPS官方版本下载提供了深入分析
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