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  • 1
    Electronic Resource
    Electronic Resource
    Universal properties of linear and ring polymers (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 1159-1162 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The ratio of the mean-square radius of gyration to mean-square end-to-end distance for linear chains and the mean-square radius of gyration ratio of ring to linear chains are investigated for two- , three- , four- , and five-dimensional polymers, with and without excluded volume, via Brownian dynamics. Our studies, for the Lennard-Jones repulsive interaction, indicate the universality of these ratios.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455223
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  • 2
    Electronic Resource
    Electronic Resource
    Polymer shapes in two, four, and five dimensions (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 3976-3980 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The average asymmetry of two-, four-, and five-dimensional linear and ring polymers, with and without excluded volume, is investigated numerically via Brownian dynamics. It is found that the average asymmetry of nonexcluded volume chains is in good agreement with theoretical predictions in all dimensions studied. The distribution of the average asymmetry is also determined. This distribution indicates that two-dimensional ring chains are likely to be nearly symmetrical. Moreover, the distribution of the maximum eigenvalues of the tensor of the moment of inertia is also in agreement with the theoretical predictions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453847
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  • 3
    Electronic Resource
    Electronic Resource
    Application of the pivot algorithm for investigating the shapes of two- and three-dimensional lattice polymers (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 6594-6596 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A pivot algorithm is used to numerically investigate the shape properties of linear polymers, with and without excluded volume, in two and three dimensions. The high computational efficiency of the pivot algorithm has allowed us to obtain data which is four to eight times more accurate than our previous Brownian dynamics simulations, while employing considerably less computational resources. The accurate data for long polymer chains highlight the inadequacy of the d expansion of polymer shapes to first order only.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454446
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  • 4
    Electronic Resource
    Electronic Resource
    The shapes of two-, four-, and five-dimensional linear and ring polymers (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 6728-6731 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The shapes of two- , four- , and five-dimensional linear and ring polymers, with and without excluded volume, are investigated numerically via Brownian dynamics. It is found that the asphericity of nonexcluded volume linear polymers is in agreement with theoretical predictions in all dimensions. Agreement with available theoretical predictions is also obtained for two-dimensional nonexcluded volume ring polymers. Moreover, it is shown that excluded volume polymers become more ideal (i.e., closer to nonexcluded volume polymers) as the dimension is increased.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.451403
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  • 5
    Electronic Resource
    Electronic Resource
    An elastic model of the large-scale structure of duplex DNA (1979)
    New York : Wiley-Blackwell
    Biopolymers 18 (1979), S. 609-623 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A general model for the large-scale, time-independent structure of duplex DNA is developed based on elastic considerations. The general conditions of elastic equilibrium are given. These equations are solved for the equilibrium shape of stressed duplex DNA, based on the assumption that the double helix behaves mechanically as a symmetric, linearly elastic rod. It is shown that, in general, two orders of superhelicity will arise at equilibrium. Several possible applications of this approach to the supercoiling of closed circular DNA are described.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1979.360180310
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  • 6
    Electronic Resource
    Electronic Resource
    The role of the stress resultant in determining mechanical equilibria of superhelical DNA (1987)
    New York : Wiley-Blackwell
    Biopolymers 26 (1987), S. 9-15 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360260105
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  • 7
    Electronic Resource
    Electronic Resource
    Analysis of cholesterol, cholesterol-5,6-epoxides and cholestane-3β,5α,6β-triol in nipple aspirates of human breast fluid by gas chromatography/mass spectrometry (1987)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 14 (1987), S. 335-338 
    Details
    ISSN: 0887-6134
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A method has been developed for the quantitative determination of cholesterol and three of its major oxidative metabolites (the 5α,6α-epoxide, the 3β,5α,6β-triol, and the 5β,6β-epoxide) in a single sample of human breast fluid (2-50 μl), using gas chromatography/mass spectrometry with selected ion monitoring. High specificity and reliable quantification is achieved by the use of the inverse stable isotope dilution method, employing deuterium-labeled variants of the compounds as internal standards.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200140707
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  • 8
    Electronic Resource
    Electronic Resource
    Determination of chlorpromazine and its major metabolites by gas chromatography/mass spectrometry: Application to biological fluids (1985)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 12 (1985), S. 707-713 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A method for the quantitative determination of chlorpromazine and five of its major metabolites in a single sample of biological fluid in the ng/ml range has been developed utilizing gas chromatography/mass spectrometry with selected ion recording. The assay is highly specific and quantification is accomplished by an inverse stable isotope dilution technique, using deuterium-labeled variants of the compounds as internal standards. In this way the concentrations of chlorpromazine and five of its major metabolites (the sulfoxide, the N-oxide, the monodemethylated, the didemethylated, and the 7-hydroxylated compounds) can be determined in biological fluids. Levels in humans have been measured both in plasma and in red blood cells and are compared to those found in related in vitro studies.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200121207
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  • 9
    Electronic Resource
    Electronic Resource
    Scanning electron microscopy of cardiac endothelium of the dogSupported by a grant from the United States Public Health Service, NS 09363 from the Institute of Neurological Diseases and Stroke. (1975)
    New York, NY [u.a.] : Wiley-Blackwell
    American Journal of Anatomy 142 (1975), S. 137-157 
    Details
    ISSN: 0002-9106
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Tissue obtained from young dogs was fixed in buffered aldehydes by vascular perfusion or direct immersion. Selected hearts were maintained in modified mammalian Ringer's solution for three to five minutes prior to fixation. The chambers of the heart and related valves were exposed by dissection and prepared by routine techniques for observation by scanning electron microscopy (SEM). Subsequent to SEM studies, selected specimens were embedded in Epon 812 and sectioned for transmission electron microscopy (TEM).The cardiac endothelium, when fixed immediately in buffered aldehydes, presents an essentially invariable surface throughout the interior of the heart. The predominant nuclear bulges and attenuated peripheral plasmalemma are consistently smooth, with occasional marginal ruffles, scattered microvilli and small blebs. Apart from the higher population of nuclear bulges on valvular surfaces, local variations in SEM of endocardium occur in response to the various stages of systole and diastole encountered. These physiological changes do not produce microappendages.Immersion for three to five minutes in (Chenoweth's) Ringer's solution, prior to fixation, produces a substantial population of microappendages. The cellular surface acquires a swirled appearance erupting in microvilli, blebs and ruffles. These exhibit considerable pleomorphism.There is great lability of the endocardial surface in response to a classic “holding solution” widely used in preparatory techniques. In preparing soft tissues for SEM caution must be used if physiological “holding solutions” are used prior to fixation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aja.1001420202
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  • 10
    Electronic Resource
    Electronic Resource
    NMR spectra of the porphyrins. 30For Part 29, see Ref. 1. - Calibration and application of a ring current model for cobalt(III) meso-tetraphenylporphyrin (CoTPP) complexes (1987)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 25 (1987), S. 432-438 
    Details
    ISSN: 0749-1581
    Keywords: Cobalt(III) porphyrin complexes ; ring currents ; ligand geometry ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The geometry of metalloporphyrin-ligand complexes [mono-(1:1) and bis-(1:2)] produced by cobalt(III) meso-tetraphenylporphyrin (CoTPP) with amine ligands has been investigated using the diamagnetic ring current shifts of the porphyrin on the ligand nuclei.The observed ring current shifts are corrected for complexation effects by the use of cobalt(III) dimethylglyoxime (DMG) complexes. Significant changes in ligand chemical shifts are observed on formation of a DMG complex, although saturated ligands only show changes at points close to the site of complexation.Crystallographic data and corrected ring current shifts for pyridine and N1-methylimidazole are used to parameterize a double-dipole model of the CoTPP ring current. For 4-methylpiperidine a geometry calculated from corrected ring current shifts is in reasonable agreement with that observed in the solid state. The geometry calculated for a cyclohexylamine CoTPP complex can be rationalized in terms of a minimization of steric interactions with the porphyrin.Corrected 13C ring current shifts are still in poor agreement with calculated values, although there is a considerable improvement compared with uncorrected values.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260250510
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