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  • 1
    Electronic Resource
    Electronic Resource
    Circadian changes in microtubules, synaptic ribbons and synaptic ribbon fields in the pinealocytes of the baboon (Papio ursinus) (1981)
    Springer
    Cell & tissue research 217 (1981), S. 405-413 
    Details
    ISSN: 1432-0878
    Keywords: Baboon pineal gland ; Microtubules ; Synaptic ribbons ; Circadian rhythm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In baboons kept under controlled lighting conditions, microtubules (MT) are readily seen in the perikaryal cytoplasm and in the perivascular processes of pinealocytes. A significant increase in the number of MT, single synaptic ribbons (SR) and the formation of synaptic ribbon fields (RF, i.e. organelles which consist of multiple dense rodlets or plates, and vesicles), occur during the dark phase of a circadian light-dark cycle. MT may act as “tracks” for the oriented flow of vesicles derived from the smooth endoplasmic reticulum, to cytoplasmic sites where RF are being formed. The origin of the dense rodlets of RF remains unknown. Structural differences between SR and RF indicate that the latter organelles are not directly involved in impulse propagation between adjacent baboon pinealocytes. RF may function as storage organelles for some of the pineal secretory products which are formed in large amounts during the dark phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00233590
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  • 2
    Electronic Resource
    Electronic Resource
    Selenbestimmung im μg/g- und ng/g-Bereich in anorganischen und organischen Matrices nach Verdampfungsanalyse im dynamischen System durch AAS (1981)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 305 (1981), S. 1-10 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Selen in Anorgan. Material, Organ. Material ; Spektrometrie, Atomabsorption ; Verdampfung im dynam. System
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wird eine spezielle Apparatur zur Abtrennung von Selengehalten aus anorganischen (≥ 0,5 ng/g) und organischen (≥ 2 ng/g) Matrices beschrieben, die eine zuverlässige Bestimmung der isolierten Selenspuren durch Hydrid-AAS (HG-AAS) bzw. AAS mit elektrothermischer Atomisierung (ETA-AAS) ermöglicht. Beim Aufschluß der Probe im O2- bzw. Ar/O2-Trägergasstrom wird das Selen in einem Quarzsystem als SeO2 verflüchtigt und in einer Vorlage zusammen mit dem Sauerstoff und anderen flüchtigen Substanzen durch Kühlen mit flüssigem Stickstoff kondensiert. Die Leistungsfähigkeit des Verbundverfahrens wird durch zahlreiche Se-Bestimmungen in Metallen, Gesteinen, Sedimenten, Böden, pflanzlichen und tierischen Matrices belegt.
    Notes: Summary A special apparatus for the separation of low levels of selenium from inorganic (≥ 0.5 ng/g) and organic (≥2 ng/g) matrices is described. It enables a reliable determination of the isolated traces of selenium by hydride-AAS (HG-AAS) or AAS with electrothermal atomisation (ETA-AAS). During decomposition of the sample in a stream of O2 or Ar/O2 in a quartz system, selenium is volatilized as SeO2 that is subsequently trapped simultaneously with oxygen and other volatile substances by cooling with liquid nitrogen. The capability of this multi-stage procedure is proved by numerous determinations of Se in metals, rocks, sediments, soils, plant and animal matrices.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00491604
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  • 3
    Electronic Resource
    Electronic Resource
    Molecular mechanics of organic halides. V. Conformational equilibria in solution (1981)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Computational Chemistry 2 (1981), S. 384-391 
    Details
    ISSN: 0192-8651
    Keywords: Computational Chemistry and Molecular Modeling ; Biochemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Computer Science
    Notes: With a view of using data on solutions and liquids for parameter fitting in molecular mechanical force fields, Abraham's theory of solvation is incorporated in the force field procedure. Geometries and bond moments are estimated internally, partial account being taken of bond-bond induction, and used to calculate the intramolecular electrostatic energy, dipole moment, and the dipole and quadrupole terms in the solvation energy. Three dielectric constants are used, one for the solute in the vapor, one for the solution, and one for the intramolecular space through which dipole-dipole interactions take place. Examples are given, including such where computation differs with measurement, to illustrate the performance of the scheme.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcc.540020405
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    Paper (German National Licenses)
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