Results 211 to 220 of about 2,666 (259)
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Controlled release of vancomycin from biodegradable microcapsules
Journal of Microencapsulation, 2001Poly D,L-lactic acid (PLA) and its copolymers with glycolide PLGA 90:10 and 70:30 were polymerized under various conditions to yield polymers in the molecular weight range 12000-40000 daltons, as determined by gel permeation chromatography. Vancomycin hydrochloride was the hydrophilic drug of choice for the treatment of methicillin resistant ...
Ozalp, Y +3 more
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Biodegradable Nano‐ and Microparticles with Controlled Surface Properties
Macromolecular Symposia, 2005AbstractMethods suitable for formation of polyester nano‐ and microspheres with controlled surface properties are described. The title nano‐ and microspheres composed of polylactides or poly(ϵ‐caprolactone) were obtained either directly, during dispersion polymerization of corresponding monomers, or by self‐assembly of block copolymers containing ...
SLOMKOWSKI S. +7 more
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Antioxidant control of polymer biodegradation
Macromolecular Symposia, 1999AbstractHydrocarbon‐based synthetic polymers are versatile and cost‐effective materials in packaging and agriculture. Unstabilised polyolefins are known to biodegrade through peroxidation initiated by both abiotic and biotic and mechanisms. Both abiotic and biotic peroxidation can be accelerated and controlled by specially designed antioxidants and ...
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Plasticization of biodegradable polymers for use in controlled release
Clinical Materials, 1994The design of a plasticized, biodegradable polymeric material, suitable for application as a controlled-release system, was attempted. A poly(DL-lactic acid) oligomer was plasticized with 1,2-propylene glycol and glycerol. The latter plasticizer showed poor compatibility whereas 1,2-propylene glycol was compatible with the polymer up to high ...
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Control of Biodegradation in Bacteria
1991Abstract : Analysis of genes for the Beta-ketoadipate pathway revealed mechanisms underlying evolutionary divergence of controls governing biodegradation in bacteria. Transcriptional regulators that respond to muconate in Acinetobacter calcoaceticus and Pseudomonas putida diverged recently from a common ancestor.
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Factors Controlling the Biodegradation of Chemicals in Soils
1999The natural biodegradation of chemicals in the environment is controlled by both the compounds’ characteristics (e.g., hydrophobicity), the environment’s characteristics (e.g., soil organic matter content) and the activity of the microbial population.
Sylvain Fass +3 more
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Design and preparation of magnesium alloys with controllable biodegradation
Металловедение и термическая обработка металловИсследована возможность предотвращения формирования макросегрегаций и биодеградации высоколегированных сплавов магний – цинк – кальций со смешанной энтропией, полученных методом порошковой металлургии. Предложен процесс изготовления таких сплавов, включающий горячее прессование заготовок, их экструзию в стержни и механическую обработку в биоразлагаемые
Ren-Yu Chen +6 more
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Biodegradable Hydrogels for Controlled Drug Release
2010Biodegradable hydrogels for controlled drug release are based on functionalized polymer systems and are of great importance in polymer therapeutics. The most relevant aspects of biodegradable polymeric hydrogels for the release of specific drugs and bio-active compounds are the nature of biodegradable polymer, the gelation process by physical or ...
Luis García +2 more
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Macromolecular Rapid Communications, 2007
AbstractA novel preparation method for the core‐shell type biodegradable polyesters or biodegradable materials grafted with biodegradable polyesters was developed by alkaline surface treatment of biodegradable polyester films and subsequent enzymatic polymerization of aliphatic lactones, one example of which is shown in this study, i.e., the ...
Hideto Tsuji +3 more
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AbstractA novel preparation method for the core‐shell type biodegradable polyesters or biodegradable materials grafted with biodegradable polyesters was developed by alkaline surface treatment of biodegradable polyester films and subsequent enzymatic polymerization of aliphatic lactones, one example of which is shown in this study, i.e., the ...
Hideto Tsuji +3 more
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Study on the control of the compositions and properties of a biodegradable polyester elastomer
Biomedical Materials, 2009Biodegradable polyester elastomers are widely reported to be applied in varied biomedical fields. In this paper, we attempt to investigate how both the thermal-curing time and molar ratio of the monomers affect the final compositions and properties of the novel poly(glycerol-sebacate-citrate) (PGSC) elastomers. First, PGSC elastomers are obtained after
Quanyong, Liu +3 more
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