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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文学史上很多传世之作，初稿都惨不忍睹，被编辑删改得七荤八素。比如美国作家卡佛以“极简主义”著称，这背后不完全是作家本人信奉极简理念，还是编辑逼着他成了“主义”。所以给你个建议，给自己设定一个“编辑”：写初稿时，让内心的编辑去边上喝茶，看闲书，不要打扰你，改稿时，再礼貌地请他回来开工。，详情可参考WPS官方版本下载