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Modeling of Coal Liquefaction with Hindered Diffusion
Young Woo Rhee,James A . Guin 한국화학공학회 1993 화학공업과 기술 Vol.11 No.5
N/A A simple model taking into account most important aspects of catalyst properties and reaction was developed to interpret a maximal point in catalyst activity observed using unimodal catalysts in coal-tetralin reactions. The model was found to be highly applicable to the prediction of catalyst activity and the maximal point in catalyst activity could be explained in terms of the trade-off between the hindered diffusion and surface area.
James R. Jacob,Keith Mansfield,Jung Eun You,Bud C. Tennant,Young Ho Kim 한국미생물학회 2007 The journal of microbiology Vol.45 No.5
A silkworm (Bombyx mori L.) extract known to contain naturally occurring iminosugars, including 1-deoxynojirimycin (1-DNJ) derived from the mulberry tree (Morus alba L.), was evaluated in surrogate HCV and HBV in vitro assays. Antiviral activity of the silkworm extract and one of its purified constituents, 1-DNJ, was demonstrated against bovine viral diarrhea virus (BVDV) and GB virus-B (GBV-B), both members of the Flaviviridae family, and against woodchuck hepatitis virus (WHV) and hepatitis B virus (HBV), both members of the Hepadnaviridae family of viruses. The silkworm extract exhibited a 1,300 fold greater antiviral effect against BVDV in comparison to purified 1-DNJ. Glycoprotein processing of BVDV envelope proteins was disrupted upon treatment with the naturally derived components. The glycosylation of the WHV envelope proteins was affected largely by treatment with the silkworm extract than with purified 1-DNJ as well. The mechanism of action for this therapy may lie in the generation of defective particles that are unable to initiate the next cycle of infection as demonstrated by inhibition of GBV-B in vitro. We postulate that the five constituent iminosugars present in the silkworm extract contribute, in a synergistic manner, toward the antiviral effects observed for the inhibition of intact maturation of hepatitis viral particles and may complement conventional therapies. These results indicate that pre-clinical testing of the natural silkworm extract with regards to the efficacy of treatment against viral hepatitis infections can be evaluated in the respective animal models, in preparation for clinical trials in humans.
Preparation of Alumina Catalyst Supports and NiMo / Al2O3 Catalysts
Young Woo Rhee,James A . Guin 한국화학공학회 1993 화학공업과 기술 Vol.11 No.5
N/A Several alumina catalysts were prepared to investigate effects of catalyst preparation variables on pore structure, including sintering time and temperature, acid type, and fiber type and loading. Each catalyst was characterized with a porosimeter and sorptomeler in terms of pore size distribution, average pore diameters, pore volumes, densities and surface area. Bimodal NiMo catalysts were effectively prepared without Losing surface area by using a combined method of coextrusion and fiber incorporation.