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 Washington Post reported that Apple’s CEO, Tim Cook, dumped $1m into Trump’s inauguration, cultivated relationships with Trump officials, and “refrained from publicly criticizing the president or his policies on national television” – just before securing tariff exemptions for his company’s products.，更多细节参见新收录的资料