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  • 1
    Electronic Resource
    Electronic Resource
    A genetic and anthropological study of atlanto-occipital fusion (1989)
    Springer
    Human genetics 〈Berlin〉 81 (1989), S. 105-112 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Families of 20 probands with atlanto-occipital fusion were studied, and the neurological complications in these patients described. In X-ray studies of 115 close relatives, 4 additional cases (3.5%) with the same anomaly were detected. In a comparison of adult patients with closely related age- and sex-matched controls, all anthropological measurements except length and breadth of the head tended to be smaller in the patients; for height, weight, leg and foot length, and the robusticity index, these differences were statistically significant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00293884
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  • 2
    Electronic Resource
    Electronic Resource
    Some properties of glutamine synthetase and glutamate synthase from Chlorobium vibrioforme f. thiosulfatophilum (1983)
    Springer
    Archives of microbiology 134 (1983), S. 98-103 
    Details
    ISSN: 1432-072X
    Keywords: Ammonia assimilation ; Chlorobium vibrioforme f. thiosulfatophilum ; Photosynthetic bacteria ; Glutamine synthetase ; Glutamate synthase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The phototrophic green sulphur bacterium Chlorobium vibrioforme f. thiosulfatophilum assimilated ammonia via glutamine synthetase and glutamate synthase when grown with ammonia up to 30 mM, but above this level glutamate dehydrogenase was the key enzyme. Glutamine synthetase purified 42-fold was found to be adenylylated. The γ-glutamyltransferase activity of the enzyme was markedly inhibited by alanine, glycine, serine and lysine, and these amino acids in various combinations showed cumulative inhibition. Adenine nucleotides also inhibited enzyme activity, especially ATP. Glutamate synthase purified 222-fold had a maximum absorption at 440 nm which was reduced by sodium dithionite, and the enzyme was inhibited by atebrin indicating the presence of a flavin component. The enzyme had specific requirements for NADH, α-ketoglutarate and l-glutamine, the K m values for these were 13.5, 270 and 769 μM respectively. Glutamate synthase was sensitive to feedback inhibition by amino acids, adenine nucleotides and other metabolites and the combined effects of these inhibitors was cumulative.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00407939
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  • 3
    Electronic Resource
    Electronic Resource
    Electronic structure and chemical bonding of 3d-metal dimers ScX, X=Sc–Zn (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 114 (2001), S. 10738-10748 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The electronic and geometrical structures of the ground and excited states of the homonuclear Sc2, mixed ScTi, ScV, ScCr, ScMn, ScFe, ScCo, ScNi, ScCu, and ScZn 3d-metal dimers and their anions have been calculated using the density functional theory with generalized gradient approximation for the exchange-correlation potential. The ground states of the neutral dimers are found to be 5Σu− (Sc2), 6Σ+ (ScTi), 7Σ+ (ScV), 4Σ+ (ScCr), 3Σ+ (ScMn), 2Δ(ScFe), 1Σ+ (ScCo), 2Σ+ (ScNi), 3Δ(ScCu), and 4Σ+ (ScZn). A natural bond analysis reveals an antiferrimagnetic spin coupling in the ground states of ScCr, ScMn, and ScFe. This is due to the electron transfer from Sc to the opposite atom and specific bond formations. While each dimer has a unique chemical bonding pattern, most curious is the localization of two 4s electrons at both atomic sites in the ground 5Σu− state of Sc2, which leads to formation of two lone pairs and the bonding scheme: (3d+3d)α3(4s+4s)β1. No appreciable sd hybridization is found for the ground states of the ScX dimers except for ScNi. Even though the electron affinities of the ScX dimers are relatively low and do not exceed 1 eV, each ScX− (except ScCo−) possesses at least two states stable towards detachment of an extra electron. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1373693
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  • 4
    Electronic Resource
    Electronic Resource
    Geometry, electronic structure, and energetics of copper-doped aluminum clusters (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 114 (2001), S. 9792-9796 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Using density functional theory and generalized gradient approximation for exchange-correlation potential, we have calculated the equilibrium geometries and energetics of neutral and negatively charged AlnCu (n=11,12,13,14) clusters. Unlike the alkali atom-doped aluminum clusters in the same size range, the copper atom resides inside the aluminum cluster cage. Furthermore, the 3d and 4s energy levels of Cu hybridize with the valence electrons of Al causing a redistribution of the molecular orbital energy levels of the Aln clusters. However, this redistribution does not affect the magic numbers of AlnCu clusters that could be derived by assuming that Cu donates one electron to the valence levels of Aln clusters. This behavior, brought about by the smaller size and large ionization potential of the copper atom, contributes to the anomalous properties of AlnCu− anions: Unlike AlnX− (X=alkali atom), the mass ion intensities of AlnCu− are similar to those of Aln−. The calculated adiabatic electron affinities are also in very good agreement with experiment. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1367381
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  • 5
    Electronic Resource
    Electronic Resource
    Reversed-phase high-performance liquid chromatography of ketorolac and its application to bioequivalence studies in human serum
    Amsterdam : Elsevier
    Journal of Chromatography B: Biomedical Sciences and Applications 614 (1993), S. 180-184 
    Details
    ISSN: 0378-4347
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0378-4347(93)80240-5
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  • 6
    Electronic Resource
    Electronic Resource
    Dissolution test method for rifampicin-isoniazid fixed dose formulations
    Amsterdam : Elsevier
    Journal of Pharmaceutical and Biomedical Analysis 12 (1994), S. 493-497 
    Details
    ISSN: 0731-7085
    Keywords: Rifampicin and isoniazid ; dissolution medium effect ; isoniazid ; rifampicin ; rifampin ; sodium lauryl sulphate.
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0731-7085(94)80030-8
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  • 7
    Electronic Resource
    Electronic Resource
    Regulation, purification, and properties of xylanase from Cellulomonas fimi
    Amsterdam : Elsevier
    Enzyme and Microbial Technology 15 (1993), S. 990-995 
    Details
    ISSN: 0141-0229
    Keywords: Cellulomonas fimi ; Regulation ; purification ; xylanase
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0141-0229(93)90177-4
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  • 8
    Electronic Resource
    Electronic Resource
    Dehydrogenation reactions in Mg+(H2O)n clusters (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 3540-3544 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Experimental observations of the effects of solvation on the dehydrogenation reaction of Mg+(H2O)n to produce MgOH+(H2O)n−1 are presented for n≤6. The reaction is seen to occur spontaneously at room temperature for n(approximately-greater-than)4. Ligand switching reactions are used to show the Mg+–OH bonds are stronger than Mg+H2O bonds. The results show the energy required to lose an H atom decreases with the number of water molecules attached because the magnesium changes oxidation state and this results in stronger interactions with the water ligands. Ab initio calculations are used to explain these observations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.466396
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  • 9
    Electronic Resource
    Electronic Resource
    Metallocarbohedrenes: A New Class of Metal-Carbon Assemblies (1994)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 98 (1994), S. 9446-9449 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100089a015
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  • 10
    Electronic Resource
    Electronic Resource
    Atomic and electronic structure of neutral and charged SinOm clusters (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 109 (1998), S. 1245-1250 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Using molecular orbital approach and the generalized gradient approximation in the density functional theory, we have calculated the equilibrium geometries, binding energies, ionization potentials, and vertical and adiabatic electron affinities of SinOm clusters (n≤6,m≤12). The calculations were carried out using both Gaussian and numerical form for the atomic basis functions. Both procedures yield very similar results. The bonding in SinOm clusters is characterized by a significant charge transfer between the Si and O atoms and is stronger than in conventional semiconductor clusters. The bond distances are much less sensitive to cluster size than seen for metallic clusters. Similarly, calculated energy gaps between the highest occupied and lowest unoccupied molecular orbital (HOMO-LUMO) of (SiO2)n clusters increase with size while the reverse is the norm in most clusters. The HOMO-LUMO gap decreases as the oxygen content of a SinOm cluster is lowered eventually approaching the visible range. The photoluminescence and strong size dependence of optical properties of small silica clusters could thus be attributed to oxygen defects. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.476675
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