نتایج جستجو برای: nineteen century
تعداد نتایج: 122991 فیلتر نتایج به سال:
Turnover of the branched RNA intermediates and products of pre-mRNA splicing is mediated by the lariat-debranching enzyme Dbr1. We characterized a homolog of Dbr1 from Saccharomyces cerevisiae, Drn1/Ygr093w, that has a pseudo-metallophosphodiesterase domain with primary sequence homology to Dbr1 but lacks essential active site residues found in Dbr1. Whereas loss of Dbr1 results in lariat-intro...
The results of operative intervention in 19 neonates with necrotising enterocolitis are reported. There were four deaths (21%) in the series. Intestinal perforation was the indication for surgery in 10 cases (55%), three of which did not survive. Timing of operative intervention can be optimised only by close liaison between experienced physicians and surgeons in order to avoid intestinal perfo...
Constituency grammars originated with Leonard Bloomfield (1933) and were developed during the nineteen forties and nineteen fifties by a number of American structuralist linguists, including Harris (1946) and Wells (1947) — to mention just two. In the late nineteen fifties, Chomsky (1957) suggested that constituency grammars could be formalized as context free grammars. It is now clear that con...
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