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Shear Effects on Production of Lignin Peroxidase by Phanerochaete chrysosporium
Sang, Byeong-In,Kim, Yong-Hwan,Yoo, Young-Je The Korean Society for Biotechnology and Bioengine 1996 Biotechnology and Bioprocess Engineering Vol.1 No.1
Since biosynthesis of lignin peroxidase from Phanerochaete chrysosporium was known to be sensitive to shear, it is interesting to understand the effects of the shear sensitivity for the overproduction of lignin peroxidase. In stirred-tank fermentor, the shear-sensitivity in lignin peroxidase biosynthesis was quantified by using Kolmogorov length scale. It was found that agitation at 80$\mu$m Kolmogorov length scale is advantageous for the production of lignin peroxidase from P. chrysosporium. To overcome the shear sensitivity in lignin peroxidase biosynthesis caused by the agitation,P. chrysosporium was immobilized on various solid carriers. The nylon-immobilized P. chrysosporium was chosen in the present study as a way to overcome the shear sensitivity at the ranges of above 50$\mu$m Kolmogorov length scale. The adhesion force between immobilized cell and carrier can be predicted by thermodynamic approach and used as a criteria to select an adequate carrier materials for immobilization.
Roof Structure Design and Evaluation for Improvement of Roof Strength of Three-Wheel Vehicles
Yoo, Je Sung,Kwon, Jun Beom,Huh, Hoon Trans Tech Publications, Ltd. 2014 Key Engineering Materials Vol.626 No.-
<P>This paper is concerned with auto-body frames and roof structures against rollover motion which could take place frequently with TWVs compared to FWVs because of the major difference of the loading between the two motions. Topology optimization is utilized for conceptual design and preliminary design of the roof structure for various loading conditions. The roof structure for TWV consists of existing part of FWV and a new part called Cross-bar reinforcement. Although a test method for regulation of roof strength is with static loading, simulations are carried out for both static and dynamic cases. In the dynamic loading case, rate-dependency of a material needs to be considered for accurate results of FE analysis.</P>
Articles : Microbial Adaptation in the Degradation of Phenol by Alcaligenes xylosoxidans Y234
( Sung Ho Yeom ),( Seung Ho Kim ),( Young Je Yoo ),( In Sang Yoo ) 한국화학공학회 1997 Korean Journal of Chemical Engineering Vol.14 No.1
Microbial adaptation was performed to enhance the biological degradation of phenol. When Alcaligenes xylosoxidans Y234 was adapted with benzene, it could degrade phenol of 1,000 ppm completely in 60 hours while phenoladapted cell could not. This phenomenon was discussed in terms of intracellular enzyme activity and applied to the degradation of phenol in a packed-bed bioreactor.
Yoo, Tae Hyoung,Park, Chang-Jin,Han, Sang-Je,Lee, Gil-Je,Shin, Ryoung,Yun, Ji-Hyun,Kim, Ki-Jeong,Peak, Kyung-Hee 충북대학교 한국과학재단 지정 첨단원예기술개발 연구센터 2002 연구보고서 Vol.6 No.-
CaAPX1와 CaODC1의 발현 양상과 발현양을 조사하고 병저항성에 관련하여 각가의 유전자가 작용하는 기능을 알아보기 위해 담배에 형질전환체를 만들고 있는 중으로 현재 CaODC1이 형질전환체로 생산되었다. Capsicum annuum L. is infected by a number of viruses including tobacco mosaic virus (TMV). To study the defense-related genes induced against TMV in hot pepper, the leaves of pepper plant which is susceptible to P1.2 but resistant to P0 pathotype of TMV were inoculated with TMV-P0, and genes specifically up- or down-regulated during hypersensitive response were isolated by differential screening. Of those, two cDNA clones, CaODC1 and CaAPX1, were selected for further study. The CaODC1 cDNA clone putatively encoding a polypeptide of ornithine decaroboxylase and the CaAPX1 of ascorbate peroxidase were isolated. The full-length cDNAs, which is 1433 bp for CaODC1 and 972 bp for CaAPX1, contain the open reading frame of 436 and 250-amino aced residues, respectively. The response of these genes upon other pathogen infection was also examined by the bacterial pathogen (Xanthomonas compestris pv. vesicatoria race 3) inoculation. Both genes were induced in a hot pepper (C. annuum cv. ECW 20R) resistnat to this bacterial pathogen but not in a susceptible hot pepper (C. annuum cv. ECW). Especially, the transcript level of CaODC1 gene was increased rapidly in the early time after the inoculation. The result suggests possible role(s) for CaAPX1 and CaODC1 genes in plant defense against pathogens including a virus.
( Sung Ho Yeom ),( Young Je Yoo ) 한국화학공학회 1997 Korean Journal of Chemical Engineering Vol.14 No.3
The effects of metal ions on the biodegradation of benzene and toluene were investigated. Among 12 tested metal ions, Cu^(2+), Ni^(2+), Co^(2+) and A_g^+ inhibited the degradation of benzene and toluene severely by Alcaligenes xylosoxidans Y234. Cu^(2+) was found to inhibit catechol 1,2-dioxygenase in the degradation of benzene and toluene. Co^(2+) and Ni^(2+) were supposed to inhibit benzoate 1,2-dioxygenase, while Ag^+ was supposed to inhibit benzaldehyde dehydrogenase in the degradation of toluene. The inhibition effect caused by these metal ions could be overcome both by microbial adaptation and by adding specific aromatic compounds to the broth.
Spinal Epidural Lipomatosis in Korean
Yoo, Je Chul,Choi, Jeong Jae,Lee, Dong Woo,Lee, Sang Pyung The Korean Neurosurgical Society 2014 Journal of Korean neurosurgical society Vol.55 No.6
Spinal epidural lipomatosis (SEL) is a rare disorder, regarded in literature as a consequence of administration of exogenous steroids, associated with a variety of systemic diseases, endocrinopathies and the Cushing's syndrome. Occasionally, SEL may occur in patients not exposed to steroids or suffering from endocrinopathies, namely, idiopathic SEL. Thus far, case studies of SEL among Korean have been published rather sporadically. We reviewed the clinical features of SEL cases, among Koreans with journal review, including this report of three operated cases. According to this study, there were some differences between Korean and western cases. Koreans had higher incidences of idiopathic SEL, predominant involvement in the lumbar segments, very few thoracic involvement and lower MBI, as opposed to westerners.
Catalytic degradation of phenols by recyclable CVD graphene films
Yoo, Je Min,Park, Baekwon,Kim, Sang Jin,Choi, Yong Seok,Park, Sungmin,Jeong, Eun Hye,Lee, Hyukjin,Hong, Byung Hee The Royal Society of Chemistry 2018 Nanoscale Vol.10 No.13
<P>Ferrous ion-based catalysts have been widely employed to oxidatively destruct the major industrial pollutants such as phenolic compounds through advanced oxidation processes (AOPs). These agents, however, inevitably show several drawbacks including the need for pH adjustment and further purification steps to remove residual salts. Here we report the use of a chemical vapour deposition (CVD) graphene film as a novel metal-free catalyst for the AOP-based degradation of phenols in aqueous solution, which does not require additional steps for salt removal nor external energy to activate the process. We have also verified that the catalytic activity is strongly dependent on the surface area of the graphene film and the degradation efficiency can be markedly improved by exploiting an array of multiple graphene films. Finally, the recyclability of the graphene film has been validated by performing repetitive degradation tests to ensure its practical use.</P>