Aman
Mostrando 25-32 de 32 artigos, teses e dissertações.
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25. Pel, the protein that permits lambda DNA penetration of Escherichia coli, is encoded by a gene in ptsM and is required for mannose utilization by the phosphotransferase system.
Mannose uptake and phosphorylation in Escherichia coli is catalyzed by the phosphoenolpyruvate:glycose phosphotransferase system (PTS). The mannose-specific complex of the PTS, designated IIMan, comprises lipid and two membrane proteins, II-AMan and II-BMan. The proteins are encoded by ptsM, located at approximately equal to 40 minutes on the E. coli chromos
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26. The mechanism of production of multiple mRNAs for human glycophorin A.
The major sialoglycoprotein in the human red cell surface membrane, glycophorin A is encoded by a single gene. However, this gene gives rise to three species of glycophorin A mRNA of sizes about 1.0, 1.7 and 2.8 kilobases in reticulocytes, foetal liver cells and erythroleukaemic K562 cells. In an investigation of how the three mRNAs originated, we showed by
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27. A mutant cholera toxin B subunit that binds GM1- ganglioside but lacks immunomodulatory or toxic activity
GM1-ganglioside receptor binding by the B subunit of cholera toxin (CtxB) is widely accepted to initiate toxin action by triggering uptake and delivery of the toxin A subunit into cells. More recently, GM1 binding by isolated CtxB, or the related B subunit of Escherichia coli heat-labile enterotoxin (EtxB), has been found to modulate leukocyte function, resu
The National Academy of Sciences.
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28. An Epstein-Barr virus immortalization associated gene segment interferes specifically with the IFN-induced anti-proliferative response in human B-lymphoid cell lines.
Immortalization of human B-lymphocytes by Epstein-Barr virus (EBV) is associated with a decreased anti-proliferative response to interferon (IFN). In the present investigation we show that the resistance to the anti-proliferative effect of IFN class I on certain EBV-carrying Burkitt lymphoma cell lines is connected to the presence of the EBNA-2 gene and part
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29. The Biophysical Basis of Elongation Growth in Internodes of Deepwater Rice 1
Partial submergence induces rapid internodal elongation in deepwater rice (Oryza sativa L., cv Habiganj Aman II). We measured in vivo extensibility, tissue tension, hydraulic conductance and osmotic potential in the region of cell elongation in the uppermost internode. The in vivo extensibility of the internode, measured by stretching of living tissue with a
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30. An Evaluation of 2,5-Norbornadiene as a Reversible Inhibitor of Ethylene Action in Deepwater Rice 1
Partial submergence of deepwater rice (Oryza sativa L. cv Habiganj Aman II) elicits three responses: enhancement of internodal elongation, inhibition of leaf growth, and promotion of adventitious root formation. All three responses can be induced in isolated stem sections by treatment with ethylene. Dose-response curves indicate that the responses are linear
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31. The EBNA2-related resistance towards alpha interferon (IFN-alpha) in Burkitt's lymphoma cells effects induction of IFN-induced genes but not the activation of transcription factor ISGF-3.
Transfection of a plasmid encoding the Epstein-Barr virus (EBV) nuclear antigen 2 (EBNA2) gene confers resistance to the antiproliferative effect of alpha interferon (IFN-alpha) in EBV-negative U968 cells (P. Aman and A. von Gabain, EMBO J. 9:147-152, 1990). We studied the expression of IFN-stimulated genes (ISGs) in two pairs of Burkitt's lymphoma cell line
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32. Essential Role for the C-Terminal Noncatalytic Region of SHIP in FcγRIIB1-Mediated Inhibitory Signaling
The inositol phosphatase SHIP binds to the FcγRIIB1 receptor and plays a critical role in FcγRIIB1-mediated inhibition of B-cell proliferation and immunoglobulin synthesis. The molecular details of SHIP function are not fully understood. While point mutations of the signature motifs in the inositol phosphatase domain abolish SHIP's ability to inhibit calci
American Society for Microbiology.