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  • Point charge models  (5)
  • human nasal mucosa  (2)
  • (Bovine plasma)  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Identification of Na^+/K^+-ATPase inhibitors in bovine plasma as fatty acids and hydrocarbons
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Biomembranes 985 (1989), S. 55-59 
    Details
    ISSN: 0005-2736
    Keywords: (Bovine plasma) ; ATPase inhibitors ; ATPase, N^+/K^+- ; Fatty acid ; Hydrocarbon
    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)90103-X
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The approximation of electron densities (1986)
    Springer
    Theoretical chemistry accounts 69 (1986), S. 63-69 
    Details
    ISSN: 1432-2234
    Keywords: Electron density ; Gaussian 80 ; Point charge models
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract This paper discusses the approximate representation of the electron density produced by an ab initio calculation. A linear combination of Gaussians is fitted to the density by minimizing a functional which is the consequent error in field-energy. The practical implementation of the procedure, following a Gaussian 80 calculation, is described and some of the complications are analysed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00526293
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Point charge models for LiH, CH4, and H2O (1973)
    Springer
    Theoretical chemistry accounts 31 (1973), S. 311-324 
    Details
    ISSN: 1432-2234
    Keywords: Point charge models ; One-electron properties
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Point charge models for LiH. CH4, and H2O are presented. The models preserve the correct total charge and dipole moment of the molecules. Relations between spherical Gaussian wave function values and point charge model values of a variety of one-electron molecular properties are derived. The errors inherent in some of the point charge model values are of two types: those which may be large but are easily evaluated and those which are small and diminish rapidly as the distance from the molecule increases. The models are shown to be a reliable means of calculating one-electron properties and possible uses of the models are suggested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00527558
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The electron density of the water molecule (1986)
    Springer
    Theoretical chemistry accounts 69 (1986), S. 71-81 
    Details
    ISSN: 1432-2234
    Keywords: Electron density ; Gaussian models ; Point charge models ; Water molecule
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The electron density of the water molecule, as calculated by a standard program, is approximated by linear combinations of spherical Gaussians. The accuracy of the result is studied as a function of the numbers and positions of the Gaussians. Since this shows where the charge is located in the molecule it has immediate physical significance. The building-up of the density can be followed in more and more detail. From these expansions, point charge models of water are readily deduced. These are compared with models of similar kinds used by other authors. Some of the calculations have been repeated with a wavefunction of higher accuracy to investigate the stability of the results. Results show that the more accurate density requires more Gaussians to represent its greater complexity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00526294
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    The molecular electrostatic potential of some simple molecules (1986)
    Springer
    Theoretical chemistry accounts 69 (1986), S. 425-436 
    Details
    ISSN: 1432-2234
    Keywords: Molecular electrostatic potential ; Gaussian models ; Point charge models ; Water molecule
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The calculation of the molecular electrostatic potential from simplified models of the electron density is considered. Results are shown for water, hydrogen fluoride and ammonia. Little loss of accuracy is evident when the density is represented by a linear sum of well-chosen Gaussians. When these are further simplified into sets of point charges the inner parts of the molecule are poorly represented. More elaborate point moments make the representation worse. On the other hand a mixed representation with point charges and one diffuse Gaussian gives all the essential features of the potential of these molecules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00526701
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    The currant bun model of simple molecules (1986)
    Springer
    Theoretical chemistry accounts 70 (1986), S. 257-264 
    Details
    ISSN: 1432-2234
    Keywords: Point charge models ; Polarizability ; Dispersion forces
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The model of a molecule previously introduced by the authors, in which most of the electronic charge is represented by point charges on the nuclei, in the lone pairs and bonds, and the remainder is in a diffuse function which represents the outer electrons, is here extended. Molecules with several heavy atoms require several diffuse functions, one for each heavy atom, in addition to one at the centre of nuclear charge. In an electric field the centre of each diffuse function moves against a harmonic restoring force and this gives rise to the polarizability of the molecule. When two molecules interact the movement of this function produces the dispersion force. The model thus embodies all the long range forces between molecules in a more accurate and simpler way than was possible earlier.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00534234
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Histology of mucous membrane of human inferior nasal concha (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    Clinical Anatomy 3 (1990), S. 307-316 
    Details
    ISSN: 0897-3806
    Keywords: human nasal mucosa ; mast cell sub-types ; Life and Medical Sciences ; Miscellaneous Medical
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: The light microscopic features of the mucous membrane of intact inferior nasal concha are described. A proposal is made to standardize the terminology of tissue deep to the basement membrane as superficial or deep tunica propria. The range of epithelia found and the distribution of the various cell types and fibers present in the conchae are described. The variability of the tissue is stressed, both at gross and cellular levels. Mast cells are stained by using an Alcian blue and safranin technique in which the critical electrolyte concentration is adjusted to 0.3M MgCl2 This demonstrates two sub-types of mast cell. One is a relatively small, pale staining, spindle-shaped, superficially located cell, containing turquoise granules, while the other is generally more deeply located, larger, round or ovoid, containing granules of dark purplish-red. The variability of mast cell distribution shown in this study emphasizes the need for large tissue samples in any estimation of mast cell numbers.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ca.980030410
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Ultrastructure of mast cells in human inferior nasal concha (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Clinical Anatomy 4 (1991), S. 200-211 
    Details
    ISSN: 0897-3806
    Keywords: human nasal mucosa ; cellular associations ; Life and Medical Sciences ; Miscellaneous Medical
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Tissue taken from 20 patients during inferior turbinectomy was examined to elucidate the ultrastructure of mast cells, previously studied histologically, when we had noted differences in their size, granule content and staining characteristics, in epithelium, superficial and deep tunica propria of nasal mucosa.This ultrastructural study revealed that intra-epithelial mast cells were common, but often had fewer and more irregularly shaped granules than those in other areas. Mast cells were numerous in superficial tunica propria; they were small and spindle-shaped, with relatively few roundish granules, and appeared motile. Those in deeper tunica propria were larger and round or ovoid, with many roundish granules. The deeply located cells were fewer and often totally surrounded by large areas of collagen fibers. Association of mast cells with other cells was frequently noted, particularly in superficial layers, often with attenuated processes of fibroblasts and also frequently with one or more plasma cells or another mast cell.Although mast cells and unmyelinated or myelinated nerve were frequently seen in close association, specialized nerve endings were never observed.The distribution of mast cells and their granule characteristics correlates well with our earlier published histological observations.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ca.980040305
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    Paper (German National Licenses)
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