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.
来自湖北的李女士也有类似担忧。她在女儿的电话手表通讯录中发现大量未经实名认证的好友，聊天记录里存在传播擦边图片的群聊，还有陌生人发送的擦边图片内容，甚至收到过陌生人发送的“你不回信息就去死”等言论。经了解，这些陌生人大多通过“同学的同学的同学”层层添加。
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Michael Buchanan,Social affairs correspondentand
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