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  • 1975-1979  (3)
  • 1970-1974  (5)
  • 1965-1969  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Amino acid incorporation in protein during the “silent phase” before organo-mercury andp-bromophenylacetylurea neuropathy in the rat (1971)
    Springer
    Acta neuropathologica 19 (1971), S. 216-224 
    Details
    ISSN: 1432-0533
    Keywords: Protein Incorporation ; Amino Acids ; p-Bromophenylacetylurea ; Neuropathy ; Neurotoxicity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The incorporationin vivo of14C-glycine into proteins has been studied during the period before and after the onset of neurotoxicity caused by an organic mercury compound and byp-bromophenylacetylurea in rats. The observations of Yoshinoet al. (1966) on the former intoxication have been confirmed in that an impairment of glycine incorporation into proteins was present in spinal ganglion cells, and may also be taking place in other tissues, before nerve fibre degeneration takes place. A similar reduction in amino acid incorporation into proteins during the period before the onset of paralysis due top-bromophenylacetylurea is found in spinal ganglia; this finding is confirmed by anin vitro method using14C-leucine as protein precursor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00684598
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of60Co radiation on the cellular responses in degenerating dorsal columns in the rat spinal cord (1971)
    Springer
    Acta neuropathologica 19 (1971), S. 318-322 
    Details
    ISSN: 1432-0533
    Keywords: Co-Radiation ; Spinal Cord ; Rat ; Cell Proliferation ; p-Bromophenylacetylurea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Rats were irradiated with doses of 1 000–3 000 rads to the cervical spinal cord and subsequently given a paralytic dose of p-Bromophenylacetylurea. The nuclear populations in the degenerating dorsal columns were determined and it was found that a significant suppression of cell proliferation occurred after all three dose levels. The cell populations in the shielded parts of the tracts rostral to the irradiated zone were not affected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00692152
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The effects of methyl-mercury-dicyandiamide on the peripheral nerves and spinal cord of rats (1971)
    Springer
    Acta neuropathologica 19 (1971), S. 208-215 
    Details
    ISSN: 1432-0533
    Keywords: Organic Mercury ; Neuropathy ; Toxicology ; Neuronal ; Degeneration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Rats have been poisoned with methyl-mercury-dicyandiamide at two different dose levels, 5 mg/kg body weight or 7.5 mg/kg daily for 8 consecutive days. The morphological changes in peripheral nerves and the central nervous system are largely restricted to primary sensory cells of spinal ganglia, and to a lesser extent to the granular cells of the cerebellum. There were clearly two grades of cell damage, either whole cell death or whole fibre death; there is no evidence to suggest that partial fibre death could occur, at least not at the two dose levels used. No definite indications were found for this neuropathy being a ‘dying back’ process, for the nerve fibres appeared to degenerate contemporaneously along their whole extent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00684597
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  • 4
    Electronic Resource
    Electronic Resource
    Characterization of meningococcal polysaccharides by optical mixing spectroscopy. II. Effects of temperature, EDTA, and ionic strength on aggregation of group C polysaccharides in solutionWork supported by FDA. (1977)
    New York : Wiley-Blackwell
    Biopolymers 16 (1977), S. 945-963 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: We have studied the effects of temperature, EDTA, and ionic strength on C-polysaccharides in solution by examining the details of the time-correlation function using a 96-channel single-clipped photon correlation spectrometer. Our linewidth results have shown that the C-polysaccharides in buffer solution form aggregates of very broad distributions. Thus, fractionation by gel-filtration chromatography is only mildly effective. Although the aggregate sizes seem to remain relatively constant from 4 to 25°C, a fraction of those aggregates break up to form smaller fragments or monomers at higher temperatures. However, the dissolution-association process is quite slow and takes days even at room temperatures before the equilibrium is reached. We have also shown that by adding an excess amoutn of EDTA, the aggregates can be broken up. Again the dramatic changes occur only at short delay times suggesting that a protion of the larger aggregates remains. Finally, the amount and size of aggregates depend upon the ionic strength which exhibit a maximum ΓT/sin2 (θ/2) around 0.1-0.2 M KCl.If the activities of polysaccharides in solution depend upon molecular size, the standard techniques such as gel-permeation chromatography and ultracentrifugation cannot properly characterize the detailed size distribution. Quasielastic laser light scattering can provide us with a qualitative model. The quantitative details must necessarily await more extensive investigations using a combination of the techniques and better fractionation procedures in an appropriate buffer solution.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1977.360160502
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of entrance geometry on the capillary flow of cellulose acetate-acetone solution (1972)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 16 (1972), S. 2175-2184 
    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: Capillary flow data were obtained for a 27.5% solution of cellulose acetate in acetone. The solution temperature was 50°C, and the range of apparent shear rates investigated was 1.7 × 105 to 1.7 × 106 sec-1. Capillaries having tapered entrance angles of 37.88° to 120.63° were used. A power-law model was adequate to describe the shear stress at the wall (τw) and the corrected shear rate \documentclass{article}\pagestyle{empty}\begin{document}$(\dot \gamma )$\end{document} relationship. Entrance angle affected the entrance pressure drop corrected for kinetic energy, (ΔP0,c); ΔP0,c increased as the angle widened. Treating the entrance flow as an elongational flow situation facilitated superposition of the Delta;P0,c data on a single curve. Estimated elongational viscosities decreased with increasing applied stress.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1972.070160902
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Thermally induced solid state polycondensation of nylon 66, nylon 6-10 and polyethylene terephthalate (1969)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 15 (1969), S. 680-685 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The mechanism of solid state polycondensation has been subjected to a fundamental analysis. Equations were formulated for combined diffusion and chemical reaction for two separate situations. One was for solid state polycondensation in polymer flakes or chips. The other dealt with polymer powders. The resultant solutions related molecular weight changes to rate functions. A technique for deriving the rate functions from experimental data is described.Solid state polycondensations were then studied for nylon 66, nylon 6-10, and polyethylene terephthalate. These data which ranged from 120 to 200°C. were tested with various mechanisms. The most appropriate one was found to be that developed in the present work. Chemical reaction was found to be the rate controlling step in solid state polycondensation in nylon 66, polyethylene terephthalate, powders of nylon 6-10 and larger particles of nylon 6-10 at and above 160°C. Diffusion of byproduct through the solid was the rate controlling step for larger particles of nylon 6-10 at temperatures below 160°C. Thermograms of nylon 6-10 indicated morphological changes which possibly influenced the behavior of the larger nylon 6-10 particles. The Arrhenius relation was fitted to the situations where chemical reaction controlled.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690150510
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  • 7
    Electronic Resource
    Electronic Resource
    Measurement of diffusion coefficients of meningococcal polysaccharide by optical mixing spectroscopy. I. A preliminary characterization on the aggregation of the Group C polysaccharide (1974)
    New York : Wiley-Blackwell
    Biopolymers 13 (1974), S. 2281-2292 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The angular distribution of scattered intensity and decay times of concentration fluctuations have been measured by means of digital photon counting and single-clipped photon correlation for solutions of Group C meningococcal polysaccharides at 31°C. The z-average diffusion coefficient 〈D〉z and its second moment 〈D2〉z have been determined from the time-dependent correlation function using the cumulant expansion technique. Very low observed values of 〈D〉z and the tremendous width of the polydispersity index, which is the z-average normalized variance, suggest a higher degree of aggregation than the monomer-dimer type self-association at finite concentrations.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1974.360131110
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  • 8
    Electronic Resource
    Electronic Resource
    Self-association of β-lactoglobulin A in acid solution. I. Translational diffusion coefficients (1975)
    New York : Wiley-Blackwell
    Biopolymers 14 (1975), S. 93-109 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: We report measurements of the diffusion coefficient of β-lactoglobulin A (βLG-A) at pH = 5.60 and 4.58 in 0.10 ionic strength acetate buffer by the techniques of analog photocurrent signal correlation and digital single-clipped photon correlation. At a concentration of 21 mg/ml and a pH of 4.58, the self-association of β-lactoglobulin can be represented by a simple dimer-octamer equilibrium model. We determined the translational diffusion coefficient of the dimer and that of the octamer using the scattering results of Kumosinski and Timasheff in a dimer-octamer mixture. Our analysis shows that the dimer βLG-A does not change its size if the pH is varied from 5.60 to 4.58 and both species remain constant in size for temperature changes from 3.5° to 25°C Hydrodynamically, the octamers behave like closed-packed spheres with an effective radius of about 45 Å according to the Stokes-Einstein relation.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1975.360140108
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  • 9
    Electronic Resource
    Electronic Resource
    Heat capacity of poly(vinylidene fluoride) and polytetrafluoroethylene between 5 and 200°K (1979)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 17 (1979), S. 87-94 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Heat capacities of poly(vinylidene fluoride) (PVF2) and polytetrafluoroethylene (PTFE) have been measured between 5 and 100°K with an accuracy of (1-5)% by adiabatic calorimetry. Calculations based on contributions from known optical lines and the Tarasov continuum model are in good agreement with experimental results down to 30°K for PVF2 and 10°K for PTFE, and yield characteristic temperatures θ1 and θ3 which are consistent with previous values determined from high-temperature (100 - 350°K) data. At lower temperature the measured heat capacity is significantly higher [(30-100)%] than the model prediction, and can be satisfactorily accounted for by the introduction of localized vibrators at a concentration of about 1% as compared to acoustical oscillators and at a characteristic temperature of about 20°K. Using established data on polyethylene for comparison, the principle of additivity for heat capacities is found to be valid down to at least 20°K, convering the region (〈60°K) where interchain vibrations contribute significantly to the heat capacity. Possible reasons for this unexpected behavior are discussed.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1979.180170108
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