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  • 1
    Electronic Resource
    Electronic Resource
    Effects of aromatase inhibitors on reproduction in male three-spined sticklebacks, Gasterosteus aculeatus, exposed to long and short photoperiods (1997)
    Springer
    Fish physiology and biochemistry 16 (1997), S. 419-423 
    Details
    ISSN: 1573-5168
    Keywords: stickleback ; testes ; kidney ; secondary sexual characters ; maturation ; aromatization ; aromatase inhibitors ; 1,4,6-androstatriene-3,17-dione ; CGS16949 A ; 4-(5,6,7,8-tetrahydrimidazo[1,5-a]-pyridin-5-yl) benzonitrilemonohydrochloride ; photoperiod
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Three-spined stickleback Gasterosteus aculeatus, males were implanted with Silastic capsules filled with different aromatase inhibitors; 1,4,6-androstatriene-3,17-dione or the non-steroidal CGS16949 A, 4-(5,6,7,8-tetrahydrimidazol [1,5-a]pyridin-5-yl) benzonitrile monohydrochloride or empty capsules. The fish were then exposed to long or short photoperiod. Under the long photoperiod most fish in all treatments displayed a hypertrophied kidney (a secondary sexual character in sticklebacks) and completed, quiescent spermatogenesis, similar as in the natural spawning period. Under the short photoperiod the controls had unstimulated kidneys and an active spermatogenesis, whereas the males implanted with both aromatase inhibitors had stimulated kidneys, though not to the extent as in the long photoperiod, and completed, quiescent spermatogenesis. These findings suggest that aromatization is of importance for the inhibitory effects of short photoperiod on reproduction in the stickleback.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007776517447
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  • 2
    Electronic Resource
    Electronic Resource
    Simple proof of the pairing theoremThis article is dedicated to the memory of Professor Jean-Louis Calais. (1997)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 63 (1997), S. 31-33 
    Details
    ISSN: 0020-7608
    Keywords: Chemistry ; Theoretical, Physical and Computational Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A very simple constructive proof of Löwdin's pairing theorem is presented. © 1997 John Wiley & Sons, Inc.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    The chemical Hamiltonian approach for treating the BSSE problem of intermolecular interactions (1998)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 70 (1998), S. 41-63 
    Details
    ISSN: 0020-7608
    Keywords: Chemistry ; Theoretical, Physical and Computational Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The two alternative treatments of the BSSE problem of intermolecular interactions - the a posteriori counterpoise (CP) correction scheme of Boys and Bernardi (BB) and the a priori exclusion of the basic-set superposition error (BSSE) by using the “chemical Hamiltonian approach” (CHA) - are discussed. Alternative interpretations of the BB scheme are compared and some problems and paradoxes are described which can consistently be resolved by introducing a hierarchical scheme of N-body CP corrections. In CHA, one identifies those terms of the Hamiltonian (or Fockian) which cause the BSSE - the same terms cause the energy lowering in the “ghost orbitals” calculations; by omitting these terms from the Hamiltonian (Fockian), one can calculate BSSE-free wave functions, by use of which the BSSE-free values of the energy and of other physical quantities can be obtained in a conventional manner. CHA was successfully applied at the SCF and DFT levels of theory, including systems containing three or more interacting subsystems or even infinite periodic chains. The pivot full CI calculations performed for small model systems showed the applicability of the approach for treating electron correlation as well. Most recently, a CHA version of the MP2 theory and a second-order BSSE-free intermolecular PT have also been tested; they are also applicable for complexes of larger size. It was observed, at any level of theory, that the results given by the a posteriori BB and a priori CHA schemes converge to each other much faster than BSSE disappears from the uncorrected results.   © 1998 John Wiley & Sons, Inc. Int J Quant Chem 70: 41-63, 1998
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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