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  • 1
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The random copolypeptides of β-benzyl L-aspartate (β-Bz L-Asp) and γ-methyl L-glutamate (γ-Me L-Glu) were synthesized and implanted subcutaneously in rats. It was found that the resulting copolypeptides are degraded and also have good biocompatibility in vivo. On the basis of these results, poly(β-Bz L-Asp-co-γ-Me L-Glu) was tried to be used as a material for a drug delivery system. Copolypeptide-testosterone composites were prepared at a pressure of 200 kg/cm2 in the presence of a slight amount of dichloroethane. The in vivo release rate of testosterone from copolypeptide-drug composites was about 5,5 times higher than that in vitro. The in vivo release rate remained relatively constant over a period of 90 days at 0,22 mg/day. The serum testosterone concentration in castrated rats was 0,40 ng/ml and the value went up to 6,8 ng/ml after the biodegradable copolypeptide-testosterone composite was implanted and was kept constant for the duration of test.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 19 (1985), S. 615-629 
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: A radiation polymerized drug-vinyl copolymer delivery composite (0.8 mm in diameter, 3 mm long) was inserted into the right-lobe ventral prostate (I), into the right testis (II), and subcutaneously (III) into the back of male Wistar rats. The implantation was carried out over a period of 12 weeks maximum. From the relationship between the site of surgical insertion of the implant and the physiologic response (as measured by the decrease in the weight of the prostatic organs, e.g., ventral prostates, dorsolateral prostates, and seminal vesicles), it was found that in an AA560-containing composite (36 μg daily), the physiologic response is increased in order of (III) 〉 (II) 〉 (I). The same tendency was observed in the Estracyt-containing composite system (15 μg daily). The difference in the physiologic response owing to the site of surgical insertion of the implant was not observed in an E2-17β-containing composite (6 μg daily), although this composite showed the strongest physiologic response. No physiologic response in rats with CMA-containing composite (28 μg daily) was noted.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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