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.
据宁光介绍，中国—上合组织代谢性疾病合作中心将承担医学援助、医学培训、技术分享与转移、产业技术交流等任务。未来3年内，中心计划为上合组织培训2000名代谢性疾病防控专家，实现500项医疗技术在区域内分享，并倡议成立“上合代谢论坛”，进一步推动上合组织卫生健康领域的交流合作。
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A so-called "planetary nebula" is a confusing misnomer because these clouds have nothing to do with planets. As a medium-size star nears the end, it puffs out into a red giant — about 100 to 1,000 times its original size — eventually engulfing the space around it, including any nearby worlds.
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Knowledge Retrieval（规范/PRD/接口文档）
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