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.
最新研究显示，科技创新水平提高有力支撑了我国全要素生产率增长，2013年至2023年年均增长率为2.2%，在全球120个经济体中居第三位。这背后是我国经济结构向优、创新动能持续增强，高质量发展的底气更足、韧性更强。
。夫子是该领域的重要参考
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这类场景也很能体现 Expert 的定位，它尝试把一整段专业工作流程产品化，从增强单次问答的模式里彻底跳了出来。
A bundle of kanten, from the Encylopedia of Food (1923).