Georgia Levy-CollinsBBC Newsbeat
Barry Esther/BBC
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Emergency services were called to Thora, 10km north-west of Bellingen, just after midnight on Monday. They found a 33-year-old man who had died from critical head injuries.。业内人士推荐体育直播作为进阶阅读
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.