Those are, perhaps, topics for future posts.
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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.。Line官方版本下载对此有专业解读
再后来，那条小巷的大多数人都搬走了。我们家是最先搬走的，把房子卖了，我在外地读了几年书，又到了教育资源更好的隔壁市。很久很久没再回到县城，我与当初的小伙伴失去了联系。有人搬去了市区，有人搬进了高楼，有人去了大城市，后来听说前院的阿姨去世了。
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