Nyren’s sequencing method earned the name “pyrosequencing” since it revolved around the production of pyrophosphate. At first, pyrosequencing could sequence only short DNA snippets, with a few nucleotides. In 1996, however, Nyren’s lab demonstrated sequencing of up to 15 bases by using a modified “A” nucleotide to reduce their signal-to-noise ratio.7 In 1998, they increased this to 34 bases by adding another enzyme, called apyrase, to the mix; apyrase degraded unincorporated nucleotides, removing the need for constant wash steps.
完善收入分配制度。坚持按劳分配为主体、多种分配方式并存，完善初次分配、再分配、第三次分配协调配套的制度体系，提高居民收入在国民收入分配中的比重，提高劳动报酬在初次分配中的比重。优化初次分配格局。加大收入分配调节力度。稳步扩大中等收入群体规模。
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