Young Hah Rhee

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A variety of biodegradable polyesters have been developed in order to obtain useful biomaterials and to reduce the impact of environmental pollution caused by the large-scale accumulation of non-degradable waste plastics. Polyhydroxyalkanoates, poly(ε-caprolactone), poly(l-lactide), and both aliphatic and aromatic polyalkylene dicarboxylic acids are(More)
AnAlcaligenes sp. SH-69 strain capable of accumulating poly-β-hydroxy-alkanoates(PHAs) from a range of carbon sources was isolated. This organism accumulated copolyesters consisting of 3-hydroxybutyrate and 3-hydroxyvalerate after 24 h batch culture with simple carbohydrate substrates that were not generally considered as precursors of 3-hydroxyvalerate(More)
An efficient process for the preparation of poly(3-hydroxybutyrate) (PHB) microspheres with a narrow size distribution was developed. PHB was produced by a fed-batch culture of Ralstonia eutropha using fructose syrup as the sole carbon source. After autoclaving the bacteria, PHB granules, which accumulated in the cells, were isolated by a(More)
Production of ?-glucan is mainly used for cancer therapy. The most well-known are those occur in fungal grains such as cereal and other micro-organisms. The most important beta glucan from a nutritional and ingredient standpoint is that derived from fungal grain. Optimization of medium ingredients for the production of mycelial ?-glucan from lower fungi in(More)
Production of copolymer consisting of 3-hydroxybutyrate and 3-hydroxyvalerate [poly(3HB-co-3HV)] by fed-batch culture of Alcaligenes sp. SH-69 was investigated using glucose as a sole carbon source. Synthesis of poly(3HB-co-3HV) during the polymer accumulation stage was favored under dissolved oxygen tension at 20% and C/N ratio (mol glucose/mol ammonium)(More)
The oxidation of five polycyclic aromatic hydrocarbons; anthracene, benzo(α)pyrene, fluoranthene, phenanthrene and pyrene was catalyzed by laccase from Coriolus hirsutus in the presence of the redox mediators, 2,2′-azinobis(3-ethylbenzthiazoline-6-sulfonate) (ABTS) and 1-hydroxybenzotriazole (HBT). In the ABTS-mediated system, benzo(α)pyrene was the most(More)
The effect of oxygen-containing defects on the adsorption onto plasma-treated single- walled carbon nanotubes (SWCNTs) of two peptide sequences known to bind to the CNT surface was investigated using chemiresistor-type SWCNT devices. A peptide with highly selective affinity for SWCNTs was designed and its mutated peptide was used as a control to compare the(More)
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