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.
63-летняя Деми Мур вышла в свет с неожиданной стрижкой17:54
。heLLoword翻译官方下载是该领域的重要参考
Дания захотела отказать в убежище украинцам призывного возраста09:44。搜狗输入法下载是该领域的重要参考
В Финляндии предупредили об опасном шаге ЕС против России09:28。safew官方下载对此有专业解读
针对“未来之城”雄安新区的建设，告诫“把每一寸土地都规划得清清楚楚后再开工建设，不要留历史遗憾”；