ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Acidovorax avenae subsp. avenae  (1)
  • Chemistry  (1)
  • 1
    Electronic Resource
    Electronic Resource
    In Vitro Biodegradation of Polyester-Based Plastic Materials by Selected Bacterial Cultures (2000)
    Springer
    Journal of polymers and the environment 8 (2000), S. 17-27 
    Details
    ISSN: 1572-8900
    Keywords: Variovorax paradoxus ; Acidovorax avenae subsp. avenae ; poly(3-hydroxybutyrate-co-3-hy-droxyvalerate) ; poly(ε-caprolactone) ; poly(butylene succinate-co-butylene adipate) ; in vitro biodegradation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A simple and rapid in vitro test was designed for the assessment of the biodegradation of polyester-based plastics by selected biodegrading bacterial strains. Variovorax paradoxus LMG 16137 was used for the degradation of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) and Acidovorax avenae subsp. avenae LMG 17238 fo the synthetic-based polyesters poly(ε-caprolactone) (PCL), poly(butylene succinate-co-butylene adipate), and a starch-PCL blend. Degradation by the bacteria was studied in liquid medium with the plastics (films, granules, and injection-molded test bars) as sole sources of carbon. Degradation was followed through gravimetry, growth of the culture, and tensile testing. The effects of incubation time, inoculum density, aeration, incubation temperature, and pH of the medium on the mass loss were investigated and conditions optimized. The test allowed to obtain reproducible results on the mass loss of plastic samples in less than 3 weeks and yielded excellent partially degraded samples for further analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010168011209
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Autosterilization of biodegradable implants by injection molding process (1997)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 38 (1997), S. 115-119 
    Details
    ISSN: 0021-9304
    Keywords: biodegradable implants ; sterility ; polylactic acid polymers ; injection molding ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: Sterilization of degradable implants by standard procedures may damage the parts due to the labile chemical nature of the polymers. This study examined whether the injection molding process used for the production of polymeric parts may itself sterilize the implant due to high temperature, pressure, and shear forces applied. Poly-D,L-lactic acid (PDLLA) and poly-L-lactic acid (PLLA) granules were contaminated with thermoresistant spores of Bacillus stearothermophilus (〉105 spores/g). Sterile and contaminated granules of both polymers were injection molded and tested for sterility. All 27 samples produced with sterile PDLLA and processed at 120 °C and all 18 samples produced with sterile PLLA at 200 °C remained sterile after injection molding and handling. However, in five out of 28 PDLLA samples and in one out of 26 PLLA samples produced with contaminated material, spores had survived the process. In conclusion, the injection molding process could not reliably sterilize parts produced with polylactic acid granules that were heavily contaminated with thermoresistant organisms. However, the number of viable spores was significantly reduced by more than 99.99%. Thus, the injection molding process might allow the autosterilization of parts produced with raw material that is not heavily contaminated. © 1997 John Wiley & Sons, Inc. J Biomed Mater Res (Appl Biomater) 38: 115-119, 1997
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...