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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.
。搜狗输入法2026对此有专业解读
棍针疗法、火熨疗法、刺络拔罐……在广东省中医院的传统疗法中心,中医绝活各显其能,令人称奇。
Москвичи пожаловались на зловонную квартиру-свалку с телами животных и тараканами18:04