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.
我国经济已由高速增长阶段转向高质量发展阶段,从“有没有”转向“好不好”。习近平总书记反复告诫,“再也不能简单以国内生产总值增长率来论英雄了”“新发展理念就是指挥棒、红绿灯”……,推荐阅读heLLoword翻译官方下载获取更多信息
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Intuitive interface: The intuitive design of the
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