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  • 1
    Electronic Resource
    Electronic Resource
    “Sunshine” (1892)
    [s.l.] : Nature Publishing Group
    Nature 47 (1892), S. 9-10 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN acknowledging the courteous criticism and the kind remarks which “C. V. B.” has been pleased to make about my little book, may I be permitted to comment on one or two points, which I think he has imperfectly understood from the text. We all know that when “C. V. B.” undertakes to review a ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/047009a0
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Degeneration and regeneration in crustacean peripheral nerves (1974)
    Springer
    Journal of comparative physiology 89 (1974), S. 1-21 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Morphological (Figs. 3–5) and physiological (Fig. 2) data from several crustacean species kept at 19–21 °C show that isolated stumps of motor axons often survive intact for 150–250 days whereas sensory axonal segments usually degenerate within 20 days. Axonal segments of both motor and sensory axons that remain connected to their cell body generally remain functionally and morphologically normal after lesioning. No evidence was found for collateral innervation of denervated muscles from intact motor neurons supplying nearby muscle masses, although the motor nerve terminals may not have completely degenerated. Evidence is presented that motor axons specifically re-innervate their original muscle mass if such re-innervation occurs within 90 days after lesioning. Regenerating sensory and motor fibers make appropriate CNS and peripheral connections so as to re-establish correctly a peripheral reflex (Fig. 2C) found in intact animals (Wilson and Davis, 1965).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00696159
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Chemoenzymatic synthesis of linear poly(sucrose acrylate): Optimization of enzyme activity and polymerization conditions (1994)
    Weinheim : Wiley-Blackwell
    Macromolecular Chemistry and Physics 195 (1994), S. 3567-3578 
    Details
    ISSN: 1022-1352
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: We have achieved significant improvements in the synthesis of poly(sucrose acrylate). A screen of 15 commercial enzymes was carried out and Alcalase 2T was selected as the best enzyme because of its high activity and selectivity for acylation of sucrose at only one site. The rate of the enzyme catalyzed acylation of sucrose to form sucrose 1'-acrylate was increased by a factor of ca. 100 compared to previous reports. This rate was increased 10-fold by treating the as received enzyme by adjusting the pH to the optimum value for the enzyme. An additional 10-fold increase was achieved by adding a lyoprotectant such as sucrose or poly(ethylene glycol) prior to lyophilizing the enzyme. Significantly higher molecular weights were obtained in aqueous polymerization systems than when N,N-dimethylformamide (DMF) was used as the solvent. Similarly, higher molecular weights were observed for oxidation/reduction than for azo-type free radical initiators. We have demonstrated that copolymers of sucrose acrylate and acrylic acid are readily prepared. Finally, by optimization of the polymerization system, we have increased the number-average molecular weight of the poly(sucrose acrylate) from M̄n = 54 000 to molecular weights M̄n as high as 2 400 000.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1994.021951105
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    Paper (German National Licenses)
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