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妈妈每日操持着一家三口的饭食,从单位下班回家,围着灶台就开始做第二份名为“母职”的工,从无懈怠。但面对招待十几口人的“大场面”,自认为厨艺不精的妈妈倍感压力。

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.

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The ends, she explains, were covered in green enamel.

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Article InformationAuthor, 凱拉·愛潑斯坦(Kayla Epstein)