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  • 11
    Electronic Resource
    Electronic Resource
    Occurrence of the plant growth regulator jasmonic acid in plants (1984)
    Springer
    Journal of plant growth regulation 3 (1984), S. 1-8 
    Details
    ISSN: 1435-8107
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The natural occurrence of jasmonic acid and its methyl ester in plants has been studied using different methods such as GC, GC-MS, HPLC, radioimmunoassay, and bioassay. Jasmonic acid was detected in several Leguminosae plants and a number of species belonging to nine other Angiospermae families. Highest amounts occurred in fruit parts, especially the immature pericarp, but it was found also in flowers and vegetative plant parts, e.g. leaves, stems, and germs. Young apple fruits contain both jasmonic acid and methyl jasmonate, and in Douglas fir, the only Gymnospermae species studied, only the methyl ester could be detected. Jasmonic acid is discussed as an endogenous plant growth regulator widely distributed in higher plants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02041987
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  • 12
    Electronic Resource
    Electronic Resource
    Chase Delphi study on fusion (1982)
    Springer
    Journal of fusion energy 2 (1982), S. 341-349 
    Details
    ISSN: 1572-9591
    Keywords: Fusion: Delphi ; nuclear ; synfuels
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The ongoing Chase Delphi study of fusion power has employed a panel of over 100 experts from 13 countries. The use of fusion for synfuel production was emphasized. The panelists believed that the length of time to successful demonstrations and commercialization of fusion could be substantially reduced over current estimates given optimal funding, and that a hydrocarbon producing reactor is feasible with minimal adverse impact on the environment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01063685
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  • 13
    Electronic Resource
    Electronic Resource
    Analysis of C1-C3 alcohols in blood by high resolution headspace gas chromatography (1982)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 5 (1982), S. 377-378 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Glass capillary columns ; Headspace analysis ; Alcohols in blood ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240050709
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  • 14
    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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  • 15
    Electronic Resource
    Electronic Resource
    Systematische Fehler bei der Selenbestimmung im ng/g-Bereich in biologischen Matrices nach dem Hydrid-AAS-Verfahren (1980)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 300 (1980), S. 18-21 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Selen in Biolog. Material ; Spektralphotometrie ; Atomabsorption ; Hydridverfahren ; Systemat. Fehler
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Vier biologische Standardreferenz-substanzen (NBS und IAEA) werden mit zwei unterschiedlichen Aufschlußmethoden, einem Naßaufschluß mit einem HNO3/HClO3/HClO4-Gemisch nach optimiertem Temperatur-Zeit-Programm sowie einer Verbrennungsmethode im Sauerstoffstrom (Trace-O-Mat), mineralisiert und die Selengehalte der Aufschlußlösungen nach der Hydrid-AAS-Methode bestimmt. Dabei treten gegenüber den zertifizierten Selengehalten mit zunehmender Einwaage Minusbefunde auf, die — von den Aufschlußmethoden unabhängig — auf sich addierende Querstörungen durch Begleitelemente im μg/g-Bereich bei der Selenhydridbildung zurückzuführen sind, wie bereits an anderer Stelle [3] beschrieben wurde.
    Notes: Summary Four biological standard-reference materials (NBS and IAEA) were mineralized with two independent decomposition methods — a wet decomposition with a mixture of HNO3/HClO3/HClO4 using an optimized temperature-time programme, and a combustion method in an oxygen stream (Trace-O-Mat). The selenium contents of the decomposition solutions were determined by the hydride-AAS method. The selenium concentrations were in agreement with the certified values at low sample weights, but decreased as the sample weights were increased. This effect is independent of the decomposition method, but is caused by interferences of concomitant elements in the μg/g-range with the formation of selenium hydride, as has been previously discussed [3].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00498709
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  • 16
    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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  • 17
    Electronic Resource
    Electronic Resource
    Surface properties determine bioadhesive outcomes: Methods and results (1984)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 18 (1984), S. 337-355 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: This investigation developed experimental evidence for the influence of different surface energy states on tissue incorporation of biomedical materials. Implants of two smooth metals, each with three different surface energy states, were placed in the subdermal fascial plane of the backs of New Zealand White rabbits and were allowed healing times of 10 and 20 days. The implant surfaces were thoroughly characterized by physical-chemical criteria prior to surgical placement and again following removal from the tissue capsules generated by the host animals. Quantitative histopathologic analysis, using standard morphometric criteria, of the adjacent tissues revealed up to a threefold increase of fibroblastic-fibrocytic cells against the initially scrupulously cleaned, high-surface-energy materials. The cells were flattened and active, producing tenacious bonds through a thin pre-adsorbed protein-dominated “conditioning” film, that could be broken only by cohesive failure in the tissue itself. In contrast, the lower-surface-energy materials typical of standard dental implants were “walled off” by a cell-poor, nonadhesive capsule with a fibrous interface separated from a thicker “conditioning” film by a lipid-rich mucus zone. The advantages of proper surface treatment to favor the desired degree of biological adhesion are apparent.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820180404
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  • 18
    Electronic Resource
    Electronic Resource
    Molecular mechanics of organic halides. III. Fluorinated olefins (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Computational Chemistry 1 (1980), S. 111-117 
    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: A molecular mechanical force field for fluorinated ethylenes and propylenes is described. The field computes geometries, dipole moments, and energy differences between isomers and rotamers. Component analysis indicates that “classical” strains alone (skeletal, nonbonded, electrostatic) cannot account for energy relationships. The discussion is supplemented by a semiempirical quantum chemical comparison of cis- and trans-FCH=CHF and of gauche- and anti-FCH2CH2F.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcc.540010202
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  • 19
    Electronic Resource
    Electronic Resource
    Remarks on the molecular mechanical calculations of functionalized hydrocarbonsPresented in part at the Molecular Mechanics Symposium, Indianapolis, Indiana, June 23-24, 1983. (1984)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Computational Chemistry 5 (1984), S. 299-306 
    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: Molecular mechanical calculations for hetero-substituted hydrocarbons present certain difficulties that are not encountered in dealing with hydrocarbons. Ways are proposed to overcome such difficulties, sometimes by two-step or iterative computation. The following topics are considered: fitting the force field by using data from studies in solution; ways to estimate atomic charges or, alternatively, bond moments; ways to account for field effects upon atomic charges and bond moments.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcc.540050404
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  • 20
    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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