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  • Chemistry  (15)
  • Benzoates  (1)
  • Chondrosarcoma  (1)
  • Colorado dams  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Chordoid sarcoma (extraskeletal myxoid chondrosarcoma) (1982)
    Springer
    Virchows Archiv 399 (1982), S. 61-78 
    Details
    ISSN: 1432-2307
    Keywords: Chordoid sarcoma ; Chondrosarcoma ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Evaluation of a series of 12 chordoid sarcomas suggests that there is a wider range of histological features in this entity then previously appreciated. Six of the lesions had a typical tumor cell organization and a mixture of cellular and myxoid stromal components, while the remaining cases were atypical because of a more solid growth pattern. Four of the 12 cases, that included both typically myxoid and more cellular examples, had small foci with hyalinized stroma segragating individual or small groups of tumor cells with and without lacunar spaces. Two atypical cases revealed more extensive and obvious chondrocytic differentiation in recurrent or metastatic lesions and in one of these, the histological pattern was that of mesenchymal chondrosarcoma. Ultrastructural examination of three cases revealed fine structural features of both the tumor cell population and extracellular matrix compatible with chondrocytic differentiation. Results of light and electron microscopy of this series of chordoid sarcoma add further support for categorizing this tumor with other malignant chondrocytic neoplasms. It is probable that chordoid sarcoma and extraskeletal myxoid chondrosarcoma represent the same entity and that this lesion has a close histogenetic relationship to mesenchymal chondrosarcoma.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00666219
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of substituted benzoates on p-aminohippurate transport in dog renal membrane vesicles (1991)
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 343 (1991), S. 102-107 
    Details
    ISSN: 1432-1912
    Keywords: p-Aminohippurate ; Benzoates ; Isolated membrane vesicles ; Organic anion transport ; Dog kidney
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The effect of substituted benzoates on the transport of p-aminohippurate (PAH) was studied in basolateral (BLMV) and brush border membrane vesicles (BBMV) isolated from dog kidney cortex. For both membranes, kinetic analysis of [3H]PAH transport in the presence of a fixed concentration of two different benzoates, respectively, revealed an increase in the apparent K m, for PAH, while the transport capacity (V max) was unaffected. This is compatible with competitive inhibition of a common transport pathway. A range of 19 monosubstituted benzoates were then tested as potential inhibitors by measuring the probenecid-sensitive fraction of 100 μmol/l PAH uptake into BLMV and BBMV in the presence of 5 mmol/l benzoate, and apparent inhibition constants (K j) were calculated. For all benzoates the inhibitory potency in BBMV was lower than in BLMV, but the pattern of inhibition was similar; the most pronounced inhibition was found for 3-Cl- and 4-Cl-benzoate, while the least pronounced inhibition was found for the 3-NH2 and 4-NH2 substitutes. The inhibitory potency, expressed as logK i, correlated significantly with the relative hydrophobicity of the benzoates determined by reversed phase HPLC, whereas a poor correlation was found between pKa and logK i. This indicates that hydrophobic and electronic parameters are the main determinants of affinity for the PAH transport system. It is suggested that the PAH transport system present in the proximal tubules is responsible for the active secretion of benzoates by the mammalian kidney.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00180684
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Poly(ethylene terephthalate) crystallization as a method for microlithography (1990)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 30 (1990), S. 1165-1170 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Thermal lithography on poly(ethylene terephthalate) (PET) is carried out by inducing crystallization through selective exposure of amorphous films to Infrared radiation. The obtained images can be smaller than the wavelength of the CO2 laser light. This circumvention of the diffraction limit is accomplished by taking advantage of the non-linear temperature dependence of the crystallization rate. The optical marking process is reversible through simple melting of the crystalline images. The complementary process, selective melting of an initially crystalline film, can also be accomplished. The use as a heat sink of a mask which forms the image pattern is demonstrated.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760301809
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  • 4
    Electronic Resource
    Electronic Resource
    Improved dispersive mixing through reduction in flow field vorticity (1988)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 35 (1988), S. 2141-2154 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Dispersive mixing is most efficiently accomplished with pure straining flow. Vorticity in the flow field inhibits this extending action; accordingly, the presence of shearing flow will decrease the overall effectiveness of dispersive mixing processes. A method to reduce the vorticity by inducing lubricated flow through development of a nonuniform distribution of the components of a polymer blend is described.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1988.070350814
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  • 5
    Electronic Resource
    Electronic Resource
    Seismic hazard evaluation for dams in northern Colorado, U.S.A. (1996)
    Springer
    Natural hazards 14 (1996), S. 227-240 
    Details
    ISSN: 1573-0840
    Keywords: Colorado dams ; earthquake recurrence ; probabilistic distances ; probabilistic seismic hazard analysis ; peak horizontal acceleration ; acceleration response spectra
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Notes: Abstract A seismic hazard evaluation for three dams in the Rocky Mountains of northern Colorado is based on a study of the historical seismicity. To model earthquake occurrence as a random process utilizing a maximum likelihood method, the catalog must exhibit random space-time characteristics. This was achieved using a declustering procedure and correction for completeness of recording. On the basis of the resulting a- and b-values, probabilistic epicentral distances for a 2 × 10−5 annual probability were calculated. For a random earthquake of magnitude M L 6.0–6.5, this distance is 15 km. Suggested ground motion parameters were estimated using a probabilistic seismic hazard analysis. Critical peak horizontal accelerations at the dams are 0.22g if median values are assumed and 0.39g if variable attenuation and seismicity rates are taken into account. For structural analysis of the dams, synthetic acceleration time series were calculated to match the empirical response spectra. In addition, existing horizontal strong motion records from two Mammoth Lakes, California earthquakes were selected and scaled to fit the target horizontal acceleration response spectra.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00128268
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Intersegmental interaction and critical concentrations in PET-HFIP solutions (1991)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 29 (1991), S. 431-436 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Spectroscopic determinations of the concentrations associated with the onset of intermolecular interaction in solutions of poly(ethylene terephthalate) (PET) are described. The intersegment forces perturb the electronic spectra and induce ground-state aggregation. These phenomena become observable at different chain densities, reflecting the influence of concentration on the coil dimensions, as well as the dynamical nature of the interactions. An estimate of the equilibrium constant for PET dimer formation in hexafluoroisopropanol is reported.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1991.090290405
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  • 7
    Electronic Resource
    Electronic Resource
    129Xe NMR as a probe of polymer blends (1992)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 30 (1992), S. 527-532 
    Details
    ISSN: 0887-6266
    Keywords: nuclear magnetic resonance (NMR) with 129Xe as probe of polymer blends ; blends, 129Xe as NMR Probe of ; rubbery polymer blends, 129Xe as NMR probe of ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The miscibility of two-component polymer blends has been investigated using xenon-129 (129Xe) nuclear magnetic resonance (NMR) to probe the phase morphology. The chemical shift of 129Xe dissolved in a given polymer is unique, thus heterogeneous blends with large domain sizes exhibit two 129Xe NMR lines. When a single resonance is obtained, the data are consistent with miscibility, yielding an upper bound on the domain size. The temperature dependence of the relative solubilities and chemical shifts of 129Xe dissolved in the pure components may allow a determination of the phase morphology in blends exhibiting a single resonance. The method is used to demonstrate that polychloroprene and 25% epoxidized 1,4-polyisoprene form a miscible blend.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1992.090300602
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  • 8
    Electronic Resource
    Electronic Resource
    Transverse heterogeneity in PET fibers (1993)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 31 (1993), S. 1331-1337 
    Details
    ISSN: 0887-6266
    Keywords: poly(ethylene terephthalate) ; transverse heterogeneity ; crystallinity ; high speed spinning ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: X-ray scattering from a series of poly(ethylene terephthalate) (PET) fibers spun at differet speeds is analyzed to probe the morphology in the direction transverse to the fiber axis. Both the apparent crystal modulus, determined from the change in wide-angle X-ray scattering angle with fiber stretching, and the transverse degree of crystallinity indicate there is a substantial interfiberillar amorphous content. In the PET fiber spun at conventional speeds, only roughly one-quarter of the fiber cross-section is actually occupied by fibrils. The transverse crystallinity increases for fibers spun at speeds sufficient to cause crystallization in the spin line. The X-ray moduli and fibril diameters are correspondingly larger in these high speed spun fibers. © 1993 John Wiley & Sons, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1993.090311008
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  • 9
    Electronic Resource
    Electronic Resource
    Rheology of a miscible polymer blend (1988)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 26 (1988), S. 839-856 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Difference spectra of blends of cis-1,4-polyisoprene and atactic poly(vinylethylene), obtained from the measured FTIR spectra of the pure components and the blends, indicate that mixing of these polymers is not accompanied by any specific chemical interactions. Miscibility in this system arises solely due to the small combinatorial entropy of mixing. The conformation and configuration of the polymer chains in the blends are, therefore, identical to those in the pure melts. As a consequence it was found that the entanglement density of the blends varied monotonically with composition. This variation, however, was not in accordance with predictions based simply on the mechanical interaction density. The principle rheological effect of miscible blending was a large change in the monomeric friction coefficient, which arises from the strong dependence of free volume on composition. The zero shear viscosity and the terminal relaxation time of the blends reflected this change in local chain mobility. Empirical relations, which have previously been proposed for the properties of miscible polymer mixtures, were found to be without merit in describing the obtained experimental results.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1988.090260409
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  • 10
    Electronic Resource
    Electronic Resource
    The amorphous phase in high-speed spun PET fibers (1993)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 31 (1993), S. 1339-1345 
    Details
    ISSN: 0887-6266
    Keywords: poly(ethylene terephthalate) ; series-parallel model ; series-aggregate model ; high-speed spinning ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Two phenomenogical descriptions of oriented semicrystalline polymers, the series-parallel model and the series-aggregate model, were applied to poly(ethylene terephthalate) (PET) fibers obtained at different spinning speeds. The mechanical behavior of the fibers conformed well to both models. The analyses indicate that PET fibers obtained by high-speed spinning possess a more compliant interfibrillar amorphous phase. This feature may account for both the greater dimensional stability, as well as the more reversible mechanical behavior, exhibited by high-speed spun PET. © 1993 John Wiley & Sons, Inc.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1993.090311009
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