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  • Computational Chemistry and Molecular Modeling  (3)
  • Lactose carrier  (2)
  • pteridines  (2)
  • 1
    Electronic Resource
    Electronic Resource
    The lactose carrier of Klebsiella pneumoniae M5a1; the physiology of transport and the nucleotide sequence of the lacY gene
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Biomembranes 945 (1988), S. 315-323 
    Details
    ISSN: 0005-2736
    Keywords: (E. coli) ; (K. pneumoniae) ; Amino acid sequence ; Lactose ; Lactose carrier ; Melibiose ; Proton cotransport ; Thiomethylgalactoside
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0005-2736(88)90494-4
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Galactoside-dependent proton transport by mutants of the Escherichia coli lactose carrier: substitution of tyrosine for histidine-322 and of leucine for serine-306
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Biomembranes 982 (1989), S. 253-264 
    Details
    ISSN: 0005-2736
    Keywords: Cotransport ; Galactoside dependence ; Lactose carrier ; Proton transport ; Transport energetics ; lacY
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0005-2736(89)90062-X
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Isolation and characterization of pteridines from heads of Drosophila melanogaster by a modified thin-layer chromatography procedure (1977)
    Springer
    Biochemical genetics 15 (1977), S. 307-319 
    Details
    ISSN: 1573-4927
    Keywords: pteridines ; Drosophila ; thin-layer chromatography ; eye pigments
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract An improved thin-layer chromatography technique is described for the separation of fluorescent compounds found in extracts of heads of Drosophila melanogaster. Eighteen to twenty fluorescent spots are resolved, two of which are xanthurenic acid and 3-hydroxykynurenine, and the remaining spots are presumably pteridines. Of these, nine have been identified and quantitated directly on the chromatograms with a fluorometer. One of the spots present on the chromatogram apparently has not been described previous to this work. Characteristics of this substance, termed “quench spot,” are presented, several of which indicate that it may be a pteridine or pteridine derivative.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00484462
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Mechanism of suppression in Drosophila. V. Localization of the purple mutant of Drosophila melanogaster in the pteridine biosynthetic pathway (1977)
    Springer
    Biochemical genetics 15 (1977), S. 321-332 
    Details
    ISSN: 1573-4927
    Keywords: pteridines ; Drosophila ; suppression ; eye color mutants ; GTP ; development
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The suppressible eye color mutant purple (pr) of Drosophila melanogaster is known to be unable to synthesize a wild-type complement of pteridine eye pigments. This study measures the reduced levels of drosopterins, sepiapterin, and an unidentified presumed pteridine in pr and pr bw. Pteridine analyses in double mutants combining pr with one of three other eye color mutants sepia, Henna-recessive3, and prune2, suggest that the metabolic block in pr occurs prior to sepiapterin biosynthesis. Measurements of GTP and GTP cyclohydrolase in pr showed wild-type levels and indicate the metabolic block in pr to be at one of the steps converting dihydroneopterin triphosphate to sepiapterin. Quantitation of pteridines in suppressed purple [su(s) 2; pr and pr; su(pr) e3] shows restoration of pteridines to wild-type or nearly wild-type levels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00484463
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  • 5
    Electronic Resource
    Electronic Resource
    Ab initio factorized LCAO calculation of the electronic structure of α-SiO2 (1992)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 44 (1992), S. 703-716 
    Details
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: We report on the results of calculations of the electronic structure of α-quartz that were made using the first principles, factorized linear combination of atomic orbitals method. Results were obtained for the primitive 9-atom, and orthorhombic 18- and 72-atom unit cells. Application of this method to the calculation of the electronic structure of the neutral oxygen vacancy in α-quartz is discussed and results obtained using a 72-atom unit cell are given. © 1992 John Wiley & Sons, Inc.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/qua.560440862
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  • 6
    Electronic Resource
    Electronic Resource
    Ab initio factorized LCAO calculations of the electronic band structure of ZnSe, ZnS, and the (ZnSe )1(ZnS)1 strained-layer superlattice (1992)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 44 (1992), S. 687-701 
    Details
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: We report on the results of electronic band structure calculations of bulk ZnSe, bulk ZnS, and the (ZnSe)1(ZnS)1 strained-layer superlattice (SLS) using the ab initio factorized linear combination of atomic orbitals method. The bulk calculations were done using the standard primitive nonrectangular 2-atom zincblende unit cell, while the SLS calculation was done using a primitive tetragonal 4-atom unit cell modeled from the CuAu I structure. The analytic fit to the SLS crystalline potential was determined by using the nonlinear coefficients from the bulk fits. The CPU time saved by factorizing the energy matrix integrals and using a rectangular unit cell is discussed. © 1992 John Wiley & Sons, Inc.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/qua.560440861
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  • 7
    Electronic Resource
    Electronic Resource
    Ab initioSCF calculations on Mn-related defects in CaF2 (1992)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 44 (1992), S. 673-686 
    Details
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: We report on the progress in a study to determine the structure of radiation-induced Mn defect complexes in CaF2. The purpose of this study is to correlate the calculated transition energies with those measured experimentally and to determine what effect the inclusion of the external lattice field has on these transitions. Unrestricted open shell Hartree-Fock Self-Consistent Field (UHF) calculations were performed on the unperturbed F-center [Ca4F6Vac]1+ S = 1/2, the unperturbed Mn2+ center [MnF8]6- S = 5/2, S = 3/2 and the Mn2+ perturbed F-center [Mn2Ca2F6Vac]1+ S = 11/2, S = 9/2 defect clusters. A method by which the effects of the external lattice field may be incorporated in the SCF procedure is developed and used in these calculations. Several transition energies are calculated and Mulliken population results for these clusters are presented and discussed. © 1992 John Wiley & Sons, Inc.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/qua.560440860
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