In 1975, Sanger published his own DNA sequencing method alongside laboratory technician Alan Coulson, called the “plus and minus” technique. First, scientists mixed the DNA strand to be sequenced with an enzyme, DNA polymerase, as well as a primer, three normal dNTPs and one radiolabeled dNTP. Radiolabeled nucleotides are incorporated into growing DNA strands just like normal nucleotides, but are tagged with radioactive isotopes, such as phosphorus-32 or sulfur-35, so they can be detected using radiation-measuring equipment.
“冲突持续”假设下，第二轮谁接棒？在“战争拖长、霍尔木兹海峡长期不畅”的情景假设下，除了已经明显涨价的甲醇、LPG、硫磺、国际尿素外，部分目前仅处于情绪预热或温和跟涨的品种，将逐步进入第二轮、更具结构性的涨价周期，典型代表是硫磺的二次冲击、聚烯烃系统抬升，以及乙二醇的成本托底与补涨机会。
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