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  • Springer  (141)
  • Oxford University Press  (43)
  • American Chemical Society (ACS)  (33)
  • American Institute of Physics (AIP)
  • 2015-2019  (213)
  • 1965-1969  (19)
  • 1
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    NMR Metabolomics Show Evidence for Mitochondrial Oxidative Stress in a Mouse Model of Polycystic Ovary Syndrome (2015)
    American Chemical Society (ACS)
    Details
    Publication Date: 2015-07-07
    Description: Journal of Proteome Research DOI: 10.1021/acs.jproteome.5b00307
    Print ISSN: 1535-3893
    Electronic ISSN: 1535-3907
    Topics: Chemistry and Pharmacology
    Published by American Chemical Society (ACS)
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    PAPER CURRENT
  • 2
    Electronic Resource
    Electronic Resource
    Evaluation of calculated entanglement spacings for undiluted linear amorphous polymers (1968)
    Springer
    Rheologica acta 7 (1968), S. 332-335 
    Details
    ISSN: 1435-1528
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Conclusions In reality, entanglements based on rheological measurements have been essentially defined operationally as a kinetic or time delay effect present in concentrated polymer systems. This is where intuitively molecular loops or overlap and entanglements of polymer chains are most likely to occur. The evaluation in fig. 2 suggests that the theory of rubber elasticity, even discounting the inherent imprecision of measurements, gives anM e which is not relatable to polymer composition 1and chain structure. Conversely reliable and internally consistent values ofM c can come from the molecular weight dependence of: 1.Newtonian viscosities, 2.NMR relaxation times, and 3 the shear dependence of viscosities, see fig. 1. However, entanglement spacings calculated in this way lack adequate theoretical substantiation particularly as to the mechanism of flow. Nonetheless, the correlation ofM c with composition and structure is convincing and provides a sound empirical correlation and the basis for a renaissance in theoretical interpretation of viscoelastic behavior of linear amorphous polymers. Further theory must rationalize the fact that the shear compliance, which is proportional toM e , depends on a combination of molecular weight averages involvingZ andZ+1. Yet the break in viscosity-molecular weight curves yieldingM c has been generally confirmed to depend on only weight average molecular weight. The values ofM c appear worthy of further experimental and theoretical evaluation. The values ofM e appear to be based on experimental techniques that at present do not provide sufficient precision to warrant citation of such values molekular weight distribution is thought to have an important yet ill-defined influence on calculated values of M e .
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01984847
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Microtubules and pigment migration in the melanophores ofFundulus heteroclitus L. (1966)
    Springer
    Protoplasma 61 (1966), S. 322-345 
    Details
    ISSN: 1615-6102
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The dermal melanophores ofFundulus heteroclitus L. have been investigated by light and electron microscopy with the purpose of revealing the mechanisms controlling pigment migration. As predicted by earlier studies, the nerve endings of a double innervation were found adjacent to and in synaptic relation to the melanophore surface. Not expected were the large number of small pits or invaginations present in the cell surface. These appear identical to the so-called micropinocytotic vesicles found generally in cells of the vascular endothalium and smooth muscle. In chromatophores they are more reasonably interpreted as receptor sites for neurohormones than as uptake and transport mechanisms. Observations made on the kinetics of pigment migration within the processes of these melanophores indicate that the granules move along relatively fixed channels arranged parallel to the long axes of the processes. Examined at fine structure levels, the zones of cytoplasm around these channels are found to be populated by microtubules about 225 Å in diameter aligned parallel to the direction of pigment movement. These long slender elements are present in the processes regardless of whether the melanin is concentrated in the cell center or dispersed. It is reasoned from these and other observations that the microtubules function as cytoskeletal elements which help maintain the extended form of the melanophore arms and at the same time define the channels in which the pigment moves. The possible role of the tubule in generating the motive force for pigment migration is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01248988
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  • 4
    Electronic Resource
    Electronic Resource
    Cytoplasmic fibrils in living cultured cells (1967)
    Springer
    Protoplasma 64 (1967), S. 349-380 
    Details
    ISSN: 1615-6102
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary By a combined light and electron microscopic study, the structure and behavior of the stress fibers of cultured rat embryo cells are described. From an analysis of movie records of living cells it is seen that the stress fibers are in a state of flux, continually altering their dimensions and dispositions within the cell. However, compared to most other cellular movements, these rates of change are slow. By electron microscopy it is shown that the stress fibers consist of bundles of close packed elongate 75 Å filaments, arranged just beneath the plasma membrane adjacent to the cell's plane of attachment and that similar filaments, forming a loose framework, permeate the cytoplasmic matrix. On the basis of careful light and electron microscopic comparisons, it is concluded that the filamentous structure shown within the cytoplasm of glutaraldehyde/osmium-fixed cells is a generally accurate representation of the structure of the living cell cytoplasm. It seems likely that the stress fibers are concerned in stabilizing areas of cellular attachment as well as with resisting forces that stretch the cell. The suggestion is made that, by controlling cytoplasmic viscosity and responding to cytoplasmic microtubules, the diffuse framework of filaments helps to determine the form of the cell and that, by a coordinate dynamic activity of its filaments, it provides the motive power for the various forms of cellular and intracellular movements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01666538
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  • 5
    Electronic Resource
    Electronic Resource
    Ultrastructure ofLabyrinthula (1969)
    Springer
    Protoplasma 67 (1969), S. 1-19 
    Details
    ISSN: 1615-6102
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Electron microscopic observations of the vegetative colony ofLabyrinthula clearly show that the “slimeways”, along which the cells glide, are extracellular and completely surround the cells. Membranes of this extracellular matrix have a trilaminar, unit membrane structure that is characteristic of the plasma membrane. The Golgi complex of the cells probably consists of two large dictyosomes. A membrane-limited bundle of parallel filaments of unknown function is usually adjacent to one dictyosome. Specialized invaginations of the plasma membrane, called bothrosomes, may be sites of membrane assembly and secretion of the “slimeway” matrix, the prerequisite substratum for the gliding cell movement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01256763
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  • 6
    Electronic Resource
    Electronic Resource
    Generalized quadratic forms inGF(q) (1969)
    Springer
    Archiv der Mathematik 19 (1969), S. 615-620 
    Details
    ISSN: 1420-8938
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01899391
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  • 7
    Electronic Resource
    Electronic Resource
    Some systems of equations in a finite field (1967)
    Springer
    Mathematische Zeitschrift 100 (1967), S. 141-145 
    Details
    ISSN: 1432-1823
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01110790
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  • 8
    Electronic Resource
    Electronic Resource
    Application of the differential scanning calorimeter to purity measurements (1969)
    Springer
    Journal of thermal analysis and calorimetry 1 (1969), S. 449-458 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Résumé On décrit une nouvelle méthode à calculer la pureté des substances organiques non polymères à l'aide de la courbe enregistrée sur un “Differential-Scanning Calorimètre”Perkin-Elmer. Au lieu d'utiliser seulement la partie initiale du pic, on se sert du tracé complet. On attribue une valeur numérique définie à la perte d'énergie, précédemment déterminé e par approximations successives. Un seul enregistrement sur le DSC permet d'obtenir des valeurs significatives de la pureté, avec des échantillons à 95–99.9 %. On montre que cette nouvelle méthode fournit des résultats plus exacts et moins ambigus que celle des fabricants
    Abstract: Zusammenfassung Es wird über eine neue Methode zur Ermittlung der Reinheit von organischen, nicht-polymeren Stoffen mit Hilfe einer durch ein Differential-Scanning Calorimeter Perkin-Elmer gezeichneten Kurve berichtet. Die Methode beruht auf der Verwendung der vollen Kurve und gibt für den Energieverlust definitive numerische Werte. Verläßliche Reinheitswerte von Proben von 95 bis zu 99.9 % Reinheit können durch eine einzige Kurve erhalten werden. Die neue Methode gibt sicherere und eindeutigere Ergebnisse als die von den Geräterzeugern vorgeschlagene.
    Notes: Abstract This paper presents a new method for the calculation of the purity of organic, non-polymeric samples using the recorder trace from a Differential Scanning Calorimeter (DSC), Perkin-Elmer Corp. The entire DSC recorder trace is employed rather than only the initial portion of the curve. The previous trial and error choice of energy lost by the DSC trace has been replaced by a definite numerical value. Meaningful purity values have been obtained from a single DSC trace on samples of from 95 to 99.9% purity. This new method has been demonstrated to provide more accurate and less ambiguous results than the manufacturer's procedure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01983087
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  • 9
    Electronic Resource
    Electronic Resource
    Pairs of bilinear and quadratic equations in a finite field (1966)
    Springer
    Monatshefte für Mathematik 70 (1966), S. 155-160 
    Details
    ISSN: 1436-5081
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01297270
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  • 10
    Electronic Resource
    Electronic Resource
    Some partitions of a skew matrix (1969)
    Springer
    Annali di matematica pura ed applicata 82 (1969), S. 115-120 
    Details
    ISSN: 1618-1891
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary Explicit formulas are obtained over a finite field for the number of partitions of a skew matrix B into various forms: for example, B=X′AY′−XA′Y.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02410791
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