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.
Цены на нефть взлетели до максимума за полгода17:55
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Who owns the Moon? A new space race means it could be up for grabs
儘管最初的爭議已趨平息，但本屆奧運期間再度掀起波瀾。
如果你也正站在孩子入园的门槛前，我想分享几点心得：