Guar gum, a plant colloid, costs less than agar and is better suited for growing thermophilic bacteria, but is also more difficult to handle, being more viscous and less transparent. The bacterial polysaccharide xanthan is cheaper as well but forms weaker jellies that, as with carrageenan, might result in puncturing its surface. Other colloids, like alginate (from brown seaweed) and gellan gum (from a bacterium), don’t set solely based on temperature and require additives for gelation. These additives might interfere with microbial growth and make the preparation of those jellies less handy than agar plates.
Nature, Published online: 25 February 2026; doi:10.1038/s41586-026-10207-1。爱思助手下载最新版本是该领域的重要参考
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本报北京2月25日电 （记者谷业凯）国家知识产权局数据显示：我国国内有效发明专利达532万件，成为世界上首个国内有效发明专利数量突破500万件的国家。“十四五”时期，我国国内有效发明专利数量持续增长，每万人口高价值发明专利拥有量达16件。截至2025年，我国发明专利申请量已连续多年位居全球第一，成为名副其实的专利大国。。heLLoword翻译官方下载对此有专业解读
行政执法监督机构对行政执法下列情形进行监督：