And footage showed orange balls of light flying across the sky over the Haitian capital of Port-Au-Prince, leaving a trail of smoke behind.
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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南方周末：伊朗当前的执政主体，是一个行事风格相对激烈，但并不极端激进的伊斯兰政权。在这样的政权格局下，未来当地的政治走向将会如何？且外界普遍关注伊朗最高领袖遇难后的伊朗政局，你认为届时伊朗可能出现哪些变化？。91视频对此有专业解读