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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.
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Nature, Published online: 27 February 2026; doi:10.1038/s41586-026-10308-x
1990年，通胀率飙升至约7650%。当时，街头的小贩每天都要重新标价，因为早上的价格到下午就已经作废；工人领到工资的第一件事，是冲进商店把钱花掉，因为放到第二天就会贬值。储蓄成了笑话，投资成了赌博。