This was not the first time that microbiologists experienced problems with agar. A phenomenon called “The Great Plate Count Anomaly” baffled researchers in the early 20th century when they observed that the number of cells seen under a microscope didn’t match the actual number of colonies growing on an agar plate. Investigating this discrepancy, researchers found agar itself to be the culprit: when nutrient broths are heated with agar during boiling, harmful byproducts (hydroperoxide) can form due to the reaction of agar with phosphate minerals contained in the media. Researchers can avoid this by autoclaving agar separately from the nutrient broth, or by reducing the amount of agar used.
5月13日，北京市第八十中学学生展示自己设计制作的仿生学设备。 新京报记者 王飞 摄
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A letter understood to be from a former employee of Wembley Stadium raised concerns about safety
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2026-02-28 00:00:00:0刘诚龙3014274010http://paper.people.com.cn/rmrb/pc/content/202602/28/content_30142740.htmlhttp://paper.people.com.cn/rmrb/pad/content/202602/28/content_30142740.html11921 宽容与自牧（金台随感）