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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这个句式结构，最初源于时尚穿搭博主。某博主在介绍服装时，常说“上身基础，下身就不基础”。后来这种说法被一些网友模仿，“XX基础，XX不基础”就变成了一个百搭句式，比如在评论一个家长不小心把孩子摔了而孩子幸好毫发无损的新闻时，就会开玩笑说：“家长基础，孩子就不基础。”
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