931 resultados para Signal nucléaire
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Includes index.
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Includes index.
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"5 December 1983."
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"1 July 1981."
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"16 June 1977."
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"May 1977."
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Includes index.
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Mode of access: Internet.
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Report year ends June 30.
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Joseph R. McCarthy, Chairman.
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--pt. 1. General history of the Corps.--pt. 2. History of detachments in the field.--pt. 3. Roster of Signal Corps, 1861-1865.
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Mode of access: Internet.
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Bibliography: p. 207-210.
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The measured inter-electrode capacitances of silicon-on-sapphire (SOS) MOSFETs are presented and compared with simulation results. It is shown that the variations of capacitances with DC bias differ from those of bulk MOSFETs due to change in body potential variation of the SOS device resulting from electron-hole pair generation through impact ionisation.
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Translational pausing may occur due to a number of mechanisms, including the presence of non-optimal codons, and it is thought to play a role in the folding of specific polypeptide domains during translation and in the facilitation of signal peptide recognition during see-dependent protein targeting. In this whole genome analysis of Escherichia coli we have found that non-optimal codons in the signal peptide-encoding sequences of secretory genes are overrepresented relative to the mature portions of these genes; this is in addition to their overrepresentation in the 5'-regions of genes encoding non-secretory proteins. We also find increased non-optimal codon usage at the 3' ends of most E. coli genes, in both non-secretory and secretory sequences. Whereas presumptive translational pausing at the 5' and 3' ends of E. coli messenger RNAs may clearly have a general role in translation, we suggest that it also has a specific role in sec-dependent protein export, possibly in facilitating signal peptide recognition. This finding may have important implications for our understanding of how the majority of non-cytoplasmic proteins are targeted, a process that is essential to all biological cells. (C) 2004 Elsevier Inc. All rights reserved.