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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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Сайт Роскомнадзора подвергся DDoS-атаке. Об этом в пятницу, 27 февраля, ведомство сообщило агентству РИА Новости.，详情可参考WPS下载最新地址
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圖像加註文字，楊振年認為寵物犬友善婚宴有發展空間。但狗隻准入餐廳新政能為香港餐飲業帶來多大的收入增長？楊振年表示這十分視乎餐廳類型，很難給出預測數字。