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Vinyl chloride (VC)/divinyl derivative copolymerization was carried out in the suspension process for preparing chemically crosslinked poly(vinyl chloride) (PVC). Effects of the reactivity ratios and concentration of divinyl, polymerization temperature and conversion on the structure of crosslinked PVC (such as the gel fraction, polymerization degree of sol and crosslinking density of gel) were investigated...
The hepatitis B virus posttranscriptional regulatory element (PRE), which resides in the 3′ region of the viral S transcripts, is important for the high-level expression of these mRNA species. We have previously shown that the PRE acts intranuclearlyin cisto allow efficient export of intronless transcripts into the cytoplasm, in a manner that is independent of viraltrans-acting factors. We here present...
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