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.
Eileen Collins made history as the first woman to pilot and command a Nasa spacecraft - but despite her remarkable achievements, not everyone will know her name.
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第四十八条 纳税人适用退(免)税、免征增值税的出口业务,应当按照规定期限申报;逾期未申报的,按照视同向境内销售的规定缴纳增值税。