منابع مشابه
Shifting Expression Procedures into Reverse
The best known approach to program transformation is the unfold fold methodology of Burstall and Darlington a sim ple intuitive and expressive approach which serves as the basis of many automatic program transformation algorithms such as partial evaluation and deforestation Unfortu nately unfold fold does not preserve total correctness and requires maintaining a transformation history of the pr...
متن کاملReverse Lexicographic and Lexicographic Shifting
A short new proof of the fact that all shifted complexes are fixed by reverse lexicographic shifting is given. A notion of lexicographic shifting, ∆lex — an operation that transforms a monomial ideal of S = k[xi : i ∈ N] that is finitely generated in each degree into a squarefree strongly stable ideal — is defined and studied. It is proved that (in contrast to the reverse lexicographic case) a ...
متن کاملShifting Native Chemical Ligation into Reverse through N→S Acyl Transfer
Peptide thioester synthesis by N→S acyl transfer is being intensively explored by many research groups the world over. Reasons for this likely include the often straightforward method of precursor assembly using Fmoc-based chemistry and the fundamentally interesting acyl migration process. In this review we introduce recent advances in this exciting area and discuss, in more detail, our own eff...
متن کاملShifting RNA polymerase into overdrive.
To direct expression of a gene, RNA polymerase (RNAP) must efficiently transcribe (copy) DNA into an mRNA molecule that is thousands to millions of nucleotides long. Organisms from bacteria to humans regulate gene expression by making RNAPs that readily hesitate, stop, or fall off the DNA template when they encounter certain sequences (called pause, arrest, or termination signals). There also e...
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It is not uncommon nowadays to be confronted with various and continuous forms of advertising by MOs trying to persuade (prospective) customers of Mobile Internet services that their respective network is the fastest, the one with the broader coverage, or the one with the overall best performance, and so on. One such example is that of Telecom NZ with its only very recently proposed slogan to c...
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ژورنال
عنوان ژورنال: Science
سال: 2004
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.304.5675.1215a