4In 2007, Barrangou et al. demonstrated for the first time the function of CRISPR/Cas9 as a defensive mechanism of bacteria against bacteriophage attacks by a technique called “plaquing” which builds upon the technique of “plating” bacteria on agar. Plaques of viruses on agar are areas without growth of bacteria due to viral attacks.
惠及人口最多,全国农村自来水普及率达到96%。全面推行城乡供水一体化、集中供水规模化、小型供水规范化、县域统管专业化“3+1”标准化建设和管护模式,规模化供水工程覆盖农村人口比例、县域统管比例分别达71%和72%,更多偏远地区喝上了“放心水”。报装、报修、缴费等服务“网上办”“码上办”,从源头到水龙头的水质保障体系逐步完善。
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