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.
完美日记是如何一步步“哑火”的“当年猫狗盘席卷彩妆圈的时候，市场上还没有那么多五花八门的产品，化妆小白基本人手一盘完美日记的眼影，结果现在都成了时代的眼泪了。”苏苏打开化妆柜，早在2022年就过期的猫咪盘、小狗盘、熊猫盘、小猪盘还保持着99新的模样，但苏苏却再也提不起兴趣来使用了。
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Екатерина Грищенко (старший редактор отдела «Бывший СССР»)
this model to bear on