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  • 1
    Electronic Resource
    Electronic Resource
    Immunocytochemical and biochemical studies of histamine in the retina of the turtle Pseudemys scripta (1992)
    Springer
    Cell & tissue research 267 (1992), S. 449-454 
    Details
    ISSN: 1432-0878
    Keywords: Histamine ; Biochemistry ; Immunocytochemistry ; Retina ; Photoreceptors ; Paraboloid ; Turtle, Pseudemys scripta (Chelonia)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A combination of immunocytochemical and biochemical methods was used to study histamine in the turtle retina. Histamine-like immunoreactivity was localized within paraboloids of certain cone photoreceptors by use of two different antisera directed against histamine. Preincubation of eyecups in Ringer's containing 10 μM histamine selectively increased the immunoreactivity of these photoreceptor paraboloids. The present localization of histamine in paraboloids indicated that, although histamine is in photoreceptors of the turtle retina, it may play some metabolic or neuromodulatory role, and not function as a neurotransmitter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00319367
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Ab initio studies of the ground-state potential energy surface of formamide (1988)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Computational Chemistry 9 (1988), S. 600-603 
    Details
    ISSN: 0192-8651
    Keywords: Computational Chemistry and Molecular Modeling ; Biochemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Computer Science
    Notes: Ab initio calculations employing a standard double-zeta basis set augmented with various polarization functions have been used to investigate the lowest energy region of the ground-state potential energy surface of the formamide molecule. Hartree-Fock calculations with only d polarization functions on the nonhydrogen atoms located two stable minima, that with geometry distorted from planarity having slightly lower energy; only one stable minimum with planar structure is found when p polarization functions on the hydrogens are included. In contrast optimizations, which account approximately for the correlation energy using second-order Møller-Plesset perturbation theory consistently favor a single slightly nonplanar minimum energy geometry.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcc.540090604
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    An empirically adjusted Newton-Raphson algorithm for finding local minima on molecular potential energy surfaces (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Computational Chemistry 11 (1990), S. 58-63 
    Details
    ISSN: 0192-8651
    Keywords: Computational Chemistry and Molecular Modeling ; Biochemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Computer Science
    Notes: A simple extension of the Newton-Raphson method is proposed that approximately accounts for anharmonicity in bond-stretching coordinates. By modeling each bonded distance in a polyatomic molecule as a Morse oscillator with no anharmonic stretch-stretch or stretch-bend coupling, a multiplicative correction factor to the Newton-Raphson step is derived. Representative examples suggest that the rate of convergence of the proposed scheme is typically faster than that of the standard Newton-Raphson method.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcc.540110106
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Concise, open-ended implementation of Rys polynomial evaluation of two-Electron integrals (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Computational Chemistry 11 (1990), S. 972-977 
    Details
    ISSN: 0192-8651
    Keywords: Computational Chemistry and Molecular Modeling ; Biochemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Computer Science
    Notes: A quadrature-point-driven implementation of the standard Rys polynomial method for computing two-electron repulsion integrals of gaussian basis functions has been found to be both concise and openended with respect to the angular momentum of the gaussian functions (i.e., s,p,d,f,g,…). These are important features in certain applications, such as molecular properties and property gradients.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcc.540110809
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    Paper (German National Licenses)
    Fulltext
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