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Funding limitations prevented Nyren from dedicating much time to the project at first, but in 1993, he was finally able to publish a proof-of-principle. His technique began by mixing the template DNA with a primer, a single dNTP, and three enzymes: the familiar DNA polymerase plus the light cascade enzymes, ATP sulfurylase and firefly luciferase.6 If the dNTP was incorporated into a strand of DNA, PPi would be produced in the chemical reaction. ATP sulfurylase could then convert the PPi into ATP, which would provide energy for the luciferase enzyme, producing light. Thus, it was possible to determine each base in the sequence by cycling through the dNTPs one at a time until light was detected, and then washing extra nucleotides out between each step. By literally rinsing and repeating, the sequence could be recorded one letter at a time without the use of any gels, which often took hours to run and were difficult to automate.。夫子对此有专业解读
第七十条 托运人托运危险货物,应当按照有关海上危险货物运输的规定妥善包装,作出危险品标志和标签,并将货物正式名称和性质以及应当采取的预防危害措施、应急处置措施书面通知承运人;托运人未通知或者通知有误的,承运人可以在任何时间、任何地点根据情况需要将货物卸下、销毁或者消除危险性,而不承担赔偿责任。托运人对承运人因运输此类货物所受到的损害,应当承担赔偿责任。
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