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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.
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My younger daughter, Nava, turned two last week. Among her favorite phrases are “No, Nava do it” and “what da HECK.” Her favorite music, by a wide margin, is Elton John. And her favorite gesture is a hearty, full-body nod. She deploys this repertoire with enormous humor, precision, and grace.。旺商聊官方下载对此有专业解读