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  • 1
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    UDP-GlcNAc 2-epimerase: a regulator of cell surface sialylation (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-05-21
    Description: Modification of cell surface molecules with sialic acid is crucial for their function in many biological processes, including cell adhesion and signal transduction. Uridine diphosphate-N-acetylglucosamine 2-epimerase (UDP-GlcNAc 2-epimerase) is an enzyme that catalyzes an early, rate-limiting step in the sialic acid biosynthetic pathway. UDP-GlcNAc 2-epimerase was found to be a major determinant of cell surface sialylation in human hematopoietic cell lines and a critical regulator of the function of specific cell surface adhesion molecules.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Keppler, O T -- Hinderlich, S -- Langner, J -- Schwartz-Albiez, R -- Reutter, W -- Pawlita, M -- New York, N.Y. -- Science. 1999 May 21;284(5418):1372-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Applied Tumor Virology Program, Tumor Immunology Program, Deutsches Krebsforschungszentrum, Im Neuenheimer Feld 280, D-69120 Heidelberg, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10334995" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antigens, CD/metabolism ; Antigens, CD14/biosynthesis ; Antigens, CD15/biosynthesis ; Antigens, Differentiation, B-Lymphocyte/metabolism ; Carbohydrate Epimerases/genetics/metabolism ; Cell Adhesion Molecules/metabolism ; Cell Membrane/*metabolism ; Culture Media ; *Escherichia coli Proteins ; Glycoconjugates/*metabolism ; HL-60 Cells ; Histocompatibility Antigens Class I/biosynthesis ; Humans ; Lectins/metabolism ; Oligosaccharides/biosynthesis ; Rats ; Sialic Acid Binding Ig-like Lectin 2 ; Sialic Acids/*biosynthesis ; Transcription, Genetic ; Transfection ; Tumor Cells, Cultured
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
    Electronic Resource
    Electronic Resource
    A global three-dimensional model of the tropospheric sulfur cycle (1991)
    Springer
    Journal of atmospheric chemistry 13 (1991), S. 225-263 
    Details
    ISSN: 1573-0662
    Keywords: Sulfur ; DMS ; SO2 ; sulfate ; global models
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract The tropospheric part of the atmospheric sulfur cycle has been simulated in a global three-dimensional model. The model treats the emission, transport, chemistry, and removal processes for three sulfur components; DMS (dimethyl sulfide), SO2 and SO4 2− (sulfate). These processes are resolved using an Eulerian transport model, the MOGUNTIA model, with a horizontal resolution of 10° longitude by 10° latitude and with 10 layers in the vertical between the surface and 100 hPa. Advection takes place by climatological monthly mean winds. Transport processes occurring on smaller space and time scales are parameterized as eddy diffusion except for transport in deep convective clouds which is treated separately. The simulations are broadly consistent with observations of concentrations in air and precipitation in and over polluted regions in Europe and North America. Oxidation of DMS by OH radicals together with a global emission of 16 Tg DMS-S yr−1 from the oceans result in DMS concentrations consistent with observations in the marine boundary layer. The average turn-over times were estimated to be 3, 1.2–1.8, and 3.2–6.1 days for DMS, SO2, and SO4 2− respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00058134
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