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.
它们规模未必庞大，却共同构成中国自主游艇制造的产业底座：以研发为核心、以制造为根基，推动行业从“代工制造”走向“自主品牌”。
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她和豆包的交流也不止是这个春节。每天外婆都会和豆包闲聊几句，给豆包打语音，打视频。