Tony Jolliffe BBC
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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一切的故事，皆来自小麦的“超能力”：经碾磨激活的谷蛋白和醇溶蛋白，在遇水后形成面筋网络，赋予面团弹性和延展性，造就了面制品极强的可塑性。
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