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  • 1
    Electronic Resource
    Electronic Resource
    Theoretical investigation of the abnormal Reimer-Tiemann reaction (1998)
    Chichester : Wiley-Blackwell
    Journal of Physical Organic Chemistry 11 (1998), S. 670-677 
    Details
    ISSN: 0894-3230
    Keywords: abnormal Reimer-Tiemann reaction ; theoretical study ; Chemistry ; Theoretical, Physical and Computational Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The molecular mechanism for the pyrrole ring expansion to yield 3-chloropyridine, as a model of the abnormal Reimer-Tiemann rearrangement, was characterized theoretically in vacuo by means of the HF/6-31G* computational method. The electron correlation was estimated at the MP2/6-31G* level and by calculations based on density functional theory, B3LYP/6- 31G* and B3LYP/6- 31+G*. Solvent effects of the diethyl ether and ethanol media were analyzed by using a polarizable continuum model. The stationary points were characterized with analytical gradient techniques in the gas phase and insolvents. The topology of the potential energy surfaces calculated at the MP2/6-31G* and B3LYP/6-31G* levels shows that the molecular mechanism corresponds to an inverted energy profile along one intermediate, associated with the addition of dichlorocarbene at the β-position of the pyrrole anion, and only one transition structure related to the ring expansion associated with the breaking and forming of Cα - Cβ and C - Cα bonds, respectively, and the Cl- leaving process. © 1998 John Wiley & Sons, Ltd.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 2
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    Selective activation of NF-kappa B by nerve growth factor through the neurotrophin receptor p75 (1996)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1996-04-26
    Description: Nerve growth factor (NGF), brain-derived neurotrophic factor (BDNF), and neurotrophin-3 (NT-3) selectively bind to distinct members of the Trk family of tyrosine kinase receptors, but all three bind with similar affinities to the neurotrophin receptor p75 (p75NTR). The biological significance of neurotrophin binding to p75NTR in cells that also express Trk receptors has been difficult to ascertain. In the absence of TrkA, NGF binding to p75NGR activated the transcription factor nuclear factor kappa B (NF-kappa B) in rat Schwann cells. This activation was not observed in Schwann cells isolated from mice that lacked p75NTR. The effect was selective for NGF; NF-kappa B was not activated by BDNF or NT-3.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Carter, B D -- Kaltschmidt, C -- Kaltschmidt, B -- Offenhauser, N -- Bohm-Matthaei, R -- Baeuerle, P A -- Barde, Y A -- New York, N.Y. -- Science. 1996 Apr 26;272(5261):542-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Neurobiochemistry, Max-Planck Institute for Psychiatry, Martinsried, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8614802" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Base Sequence ; Brain-Derived Neurotrophic Factor ; Cell Nucleus/metabolism ; Cells, Cultured ; DNA/metabolism ; L Cells (Cell Line) ; Mice ; Molecular Sequence Data ; NF-kappa B/*metabolism ; Nerve Growth Factors/*metabolism/pharmacology ; Nerve Tissue Proteins/metabolism/pharmacology ; Neurotrophin 3 ; Proto-Oncogene Proteins/metabolism ; Rats ; Receptor Protein-Tyrosine Kinases/metabolism ; Receptor, Nerve Growth Factor ; Receptor, trkA ; Receptors, Nerve Growth Factor/*metabolism ; Schwann Cells/*metabolism ; Signal Transduction/*physiology
    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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  • 3
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    Nanoscale complexity of phospholipid monolayers investigated by near-field scanning optical microscopy (1995)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1995-10-27
    Description: Near-field scanning optical microscopy of phospholipid monolayers doped with fluorescent lipid analogs reveals previously undescribed features in various phases, including a concentration gradient at the liquid-expanded/liquid-condensed domain boundary and weblike structures in the solid-condensed phase. Presumably, the web structures are grain boundaries between crystalline solid lipid. These structures are strongly modulated by the addition of low concentrations of cholesterol and ganglioside GM1 in the monolayer.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hwang, J -- Tamm, L K -- Bohm -- Ramalingam, T S -- Betzig, E -- Edidin, M -- AI14584/AI/NIAID NIH HHS/ -- AI30557/AI/NIAID NIH HHS/ -- DK44375/DK/NIDDK NIH HHS/ -- R37 AI030557/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 1995 Oct 27;270(5236):610-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biology, Johns Hopkins University, Baltimore, MD 21218, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7570018" target="_blank"〉PubMed〈/a〉
    Keywords: 1,2-Dipalmitoylphosphatidylcholine/*chemistry ; Boron Compounds ; Cholesterol/*chemistry ; Fluorescent Dyes ; G(M1) Ganglioside/*chemistry ; Microscopy/*methods ; Microscopy, Fluorescence ; Phosphatidylcholines ; Phospholipids/*chemistry
    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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