Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • 1970-1974  (312)
  • Inorganic Chemistry  (207)
  • Ultrastructure  (54)
  • Computational Chemistry and Molecular Modeling  (51)
  • 1
    Electronic Resource
    Electronic Resource
    Reactions between diisopropyl methylphosphonate and halides of divalent metal ions (1971)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 384 (1971), S. 267-279 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Metall(II) Halogenide reagieren mit Diisopropyl Methylphosphonat (DIMP) bei 150-220°C unter Bildung der folgende Komplexe: M[(C3H7O)CH3POO]2 (M = Fe, VO); M2[(C3H7O)CH3POO]2[OOP(CH3)-O-P(CH3)OO], (M = Ca, Mn, Co Ni); Zn[OOP(CH3)-O-P(CH3)OO]; Cu[CH3POO(OH)]3 (aus CuCl2 · 2 H2O + DIMP); Cu[CH3PO3] (aus CuX2 + DIMP; X = Cl, Br). Diese Komplexe wurden mittels Elektronen- und Infrarot-Spektren und magnetischen Messungen charakterisiert.
    Notes: Metal(II) halides react -with diisopropyl methylphosphonate (DIMP) at 150-220°C with formation of the following complexes: M[(C3H7O)CH3POO]2 (M = Fe, VO); M2[(C3H7O)CH3POO]2[OOP(CH3)-O-P(CH3)OO], (M = Ca, Mn, Co Ni); Zn[OOP(CH3)-O-P(CH3)OO]; Cu[CH3POO(OH)]3 (from CuCl2 · 2 H2O + DIMP); Cu[CH3PO3] (from CuX2 + DIMP; X = Cl, Br). These complexes were characterized by means of their electronic and infrared spectra and magnetic susceptibilities.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19713840312
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Cell wall formation in zoospores of Allomyces arbuscula (1974)
    Springer
    Archives of microbiology 98 (1974), S. 147-158 
    Details
    ISSN: 1432-072X
    Keywords: Allomyces ; Zoospores ; Cell Wall ; Wall Formation ; Lomasome ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Ultrastructural observations on encysting haploid zoospores of Allomyces arbuscula are presented with special reference to cell wall deposition. Multivesicular bodies are observed in the cytoplasm of zoospores 15 min after inoculation, lomasomes after 30 min and fine membrane profiles between the plasmalemma and the cyst wall are observed after 4 h indicating a possible system for secretion of cell wall components.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00425277
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    The hypothalamo-hypophysial system of hypophysectomized rats (1974)
    Springer
    Cell & tissue research 155 (1974), S. 541-554 
    Details
    ISSN: 1432-0878
    Keywords: Hypophysectomized rats ; Reorganized stalk ; Ultrastructure ; Salt load
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The reorganized stalk of hypophysectomized rats, either “intact” or subjected to a 6-day salt load, has been studied by light and electron microscopy. PAF-positive neurosecretory material is seen mainly in the periphery of the reorganized stalk, usually in 2–5 μ nerve swellings of animals operated two months before. Nerve swellings make contact with a dense capillary network. Three types of nerve fibres and their swellings are distinguished according to the size of elementary granules. Peptidergic A1 and A2 types contain granules with a maximum diameter of 170 and 130 nm respectively; monoaminergic B type fibres have granules of 100 nm in diameter. A1 type axonal swellings are the most numerous and can be tentatively divided into four subtypes according to their ultrastructure and relationships with capillaries and pituicytes. Swellings of types b and c, making direct contact with capillaries or pituicyte perikarya, usually contain few granules and numerous synaptic vesicles arranged frequently in clusters in the “active” zones. It is assumed that they are especially active in the release of peptide neurohormones. It is also hypothesized that in the hypophysectomized rats peptide neurohormones are released not only directly into the pericapillary space but also into the intercellular cleft, especially at sites of neuron-pituicyte junctions. Nerve swellings of type a, separated from the pericapillary space by thin pituicyte processes, usually contain numerous neurosecretory granules. It is suggested that vascular “end-feet” of pituicytes may somehow reduce neurohormone release. The depletion of PAF-positive material as well as the decreased granule content even after a salt load of only 1 per cent shows that the reorganized stalk is functional as a neurohaemal organ, but has a diminished hormone reserve. This, together with a primitive cytomyeloangioarchitecture speaks for morphological and functional imperfection of the reorganized stalk.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00227014
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    SCF perturbation theory and intermolecular interactions (1972)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 6 (1972), S. 555-574 
    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: A self-consistent perturbation theory is derived in the framework of Roothaan's MOLCAO procedure for closed shell systems. Contrary to previous investigations which have considered only one particle perturbations, two particle perturbation operators are considered. Expressions for the first-order density matrix and first- and second-order energy corrections are obtained. A diagram formulation of the complete perturbation expansion is presented.The results are applied to the treatment of the intermolecular interaction problem. The interaction energy is represented as a sum of several contributions: Coulomb, exchange, resonance, polarization and exchange repulsion. A semi-empirical version of the theory is suggested which explicitly involves all the physically significant energy terms and may be useful for the investigation of complex systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/qua.560060317
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Interaction of two H2 molecules: Comparative study of various perturbation procedures (1974)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 8 (1974), S. 467-489 
    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: A variational calculation of the interaction between two H2 molecules using minimal basis set of 1s functions is performed to check the efficiency of various versions of the perturbation theory for intermolecular interactions. The matrix procedure starting with the zero-order Hamiltonian which is symmetric with respect to intermolecular electron permutations shows better convergence than the procedures using nonsymmetric zero approximations. This conclusion follows from the calculations of ground state and four lowest excited states for three geometric configurations of the H4 system. The behaviour of the potential curves is interpreted in terms of symmetric perturbation theory. The various contributions to the interaction energy are considered in detail. The importance of charge transfer states for the description of the intermediate range of intermolecular separations is specially emphasized.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/qua.560080312
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Intermolecular interactions in the region of small overlap (1972)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 6 (1972), S. 23-45 
    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: In order to treat the interaction energy of two molecules a standard Rayleigh-Schrödinger perturbation theory is developed. The Hartree-Fock functions of the separated molecules are used as one particle basis functions, the initial set of states being truncated and non-orthogonal. The non-orthogonality is included into the Hamiltonian by orthogonalization of the basis set. The unperturbed Hamiltonian is chosen so that it possesses the correct symmetry properties with respect to the electron permutations between different molecules. The procedure of this kind automatically results in the appearance of charge transfer states.A graphical technique is elaborated which is a modified version of the Feynman-Goldstone technique and provides a convenient representation of the interaction energy contributions of any order. As an example the first- and the second-order diagrams are considered.A correct expression for the dispersion energy is obtained which differs by a factor from that of the theory using a nonsymmetrical zero approximation.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/qua.560060103
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Le Systeme Tl2O—V2O5 (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 410 (1974), S. 1-8 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Das System Tl2O—V2O5Das System Tl2O—V2O5 wurde mit Hilfe von thermischen Analysen und durch Röntgenanalyse untersucht. Das gesamte Zustandsdiagramm konnte aufgeklärt werden. Von den meisten erhaltenen Phasen wurden Einkristalle isoliert und die Gitterkonstanten durch Weissenberg und Präzessionsaufnahmen bestimmt. Die an Vanadium reichen Phasen sind mit den entsprechenden Kalium-Verbindungen isotyp. Die an Thallium reichen Phasen Tl4V2O7 und Tl3VO4 zeigen diese Isomorphie nicht, wahrscheinlich wegen der stereochemischen Rolle des einsamen Elektronenpaares des Thalliums(I).
    Abstract: The System Tl2O—V2O5The Tl2O—V2O5 system has been studied by thermal analysis and x-ray analysis. The entire phase diagram is reported. The symmetry and cell dimensions of most of the phases are derived from single crystal photographs. The compounds rich in vanadium are isomorphous with potassium analogues. Such an isomorphism does not exist for compounds like Tl4V2O7 and Tl3VO4; in these cases, the lone pair of thallium(I), doubtless, is stereochemically active.
    Notes: No Absstract.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744100102
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Untersuchungen zur Dispersität des Platins auf Aktivkohlen mit unterschiedlicher Porenstruktur (1972)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 389 (1972), S. 43-56 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The influence of the porous structure of thr carrier on the dispersion of the catalytically active platinum has been investigated on charcoal catalysts with a content of five percent platinum.Three samples were characterised by adsorption measurements, mercury porosimetry and X-ray small angle diffraction. Their preparation was carried out by impregnation with two different platinum complex compounds under varying the conditions. The dispersion is strongly influenced by the adsorption of the impregnated compound on the carrier surface. The good adsorption of the compound H2PtCl6 leads to highly dispersed platinum, the bad adsorption of Pt(NH3)4Cl2 causes the platinum to be only coarsely dispersed on the surface. Varying the conditions of preparation during impregnation with H2PtCl6 gives no effect, the porous structure of the carrier, however, has a strong influence on the dispersion i. e. microporous carriers yielding highly dispersed platinum, with a high part of the platinum in the micropores.
    Notes: Am Beispiel von 5proz. Platin-Kohle-Katalysatoren wurde der Einfluß der Porenstruktur des Trägers auf die Verteilung des katalytisch aktiven Platins untersucht. Dazu wurden verschiedene Kohlen eingesetzt, deren Porenstruktur durch Adsorptions-, Quecksilberporosimetrie- und Röntgenkleinwinkelmessungen charakterisiert wurden.Die Kontaktherstellung erfolgte durch Tränkung mit zwei verschiedenen Platinkomplexverbindungen. Auch die Bedingungen der Kontaktherstellung wurden variiert.Die Dispersität wird in erster Linie von der Adsorption der Tränkverbindungen auf der Trägeroberfläche bestimmt. Im Falle guter Adsorption der Tränkverbindung (H2PtCl6) auf der Trägeroberfläche werden hohe Platindispersitäten erzielt, im Falle schlechter Adsorption der Tränkverbindung (Pt(NH3)4Cl2) ist das Platin nur in grobdisperser Form auf der Trägeroberfläche verteilt. Bei guter Adsorbierbarkeit der Tränkverbindung haben die Herstellungsbedingungen keinen wesentlichen Einfluß, aber die Porenstruktur des Trägers hat einen großen Einfluß auf die erzielbare Platindispersität. Auf mikroporösen Trägern wird eine hochdisperse Platinverteilung erreicht, wobei sich ein großer Teil des Platins in den Mikroporen befindet.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19723890106
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Fine structure of eyespots in tornarian larvae (Phylum: Hemichordata) (1973)
    Springer
    Cell & tissue research 142 (1973), S. 89-102 
    Details
    ISSN: 1432-0878
    Keywords: Photoreceptors ; Larva ; Hemichordate ; Ultrastructure ; Evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The eyespots of tornariae of enteropneusts (Ptychodera flava from Hawaiian waters and an unknown species from southern California) were studied by electron microscopy. An ocellus is composed of two types of cells: sensory and supportive. The former is characterized by a bulbous cilium (with 9+2 axoneme) at its distal end, one or sometimes two arrays of microvilli from its sides below the cilium, and a basal axon. The latter features large, clear vesicles which presumably contained the reddish-orange pigment seen in the ocellus of a living larva. Five-day old tornariae of P. flava are positively phototactic. Both cilium and microvilli may function as photoreceptors. The tornarian ocellus studied is compared with eyespots of other invertebrates, and the evolutionary significance of its putative photoreceptors is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00306706
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Corticotrophic cells in the rostral zone of the pars intermedia and in the adjacent neurohypophysis of the rat and mouse (1973)
    Springer
    Cell & tissue research 136 (1973), S. 97-110 
    Details
    ISSN: 1432-0878
    Keywords: Hypophysis ; Mouse, rat ; Pars intermedia, rostral zone ; Corticotrophic cells ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In the mouse, the rostral zone of the pars intermedia is almost exclusively composed of typical corticotrophic cells. They are located around and even within the neural stalk, at the level of transition between stalk and neural lobe. In the rat, the corticotrophic cells of the rostral zone are found in scattered islets among the MSH producing cells, and also in the neural lobe. In both the rat and mouse, these cells are in direct contact with various types of nerve terminals. Synaptoid contacts with aminergic and neurosecretory nerve fibers are observed. Furthermore they are also closely related to the hypophysial portal vessels. Following adrenalectomy, the cells located in the neurohypophysis always react more intensely than tose in the rostral zone. The functional significance of these corticotrophic cells which are subject to both humoral and neural regulation remains as yet hypothetical. Their participation in neurogenic stress response seems probable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00307682
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...