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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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Welcome to our guide to the commodities driving the global economy. Today, OPEC reporter Grant Smith discusses what’s in store at the group’s policy meeting this weekend.
第五十七条 国家建立核损害赔偿责任制度，按照法律和国家有关规定处理核事故造成的损害。