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Joon-Hyeok Jeon, Hae-Won Jung, Hee-Chun Lee, Byeong-Teck Kang, Jung-Hyang Sur, Dong-In Jung 충북대학교 동물의학연구소 2014 Journal of Biomedical and Translational Research Vol.15 No.3
Ischemic stroke is the most common type of stroke in humans. The purpose of this study was to evaluate the diagnostic value of magnetic resonance imaging (MRI) in a canine model of stroke. Ischemic stroke was induced by using prepared autologous thrombus. The dogs were placed in lateral recumbency on the operation table and the cervical area of each dog was sterilized by using alcohol. After making a cervical incision, the common carotid artery and internal carotid artery (a branch of the common carotid artery that supplies an anterior part of the brain) were exposed. A 200 μL injection of the autologous thrombus prepared 24 hr prior to surgery was delivered with a 20 gauge venous catheter through an internal carotid artery. After successful delivery of the autologous thrombus, the venous catheter was removed, and the cervical incision was sutured. Neurologic signs including generalized seizures, tetraparesis, and altered mental status, were observed in all 3 dogs after induction of ischemic stroke and the signs manifested immediately after awakening from anesthesia. T1- and T2-weighted images and fluid-attenuated inversion recovery (FLAIR) images of the brain were acquired 1 day before and 1 day after surgery. On the day following ischemic stroke induction, MRI revealed multifocal lesions in the cerebral cortex and subcortex such as T1 hypointensity, T2 hyperintensity, FLAIR hyperintensity, and diffusion-weighted hyperintensity in all 3 dogs. Upon postmortem examination, ischemic lesions were found to be consistent with the MRI findings and they were unstained with 2% triphenyltetrazolium chloride. Histologic features of the earliest neuronal changes such as cytoplasmic eosinophilia with pyknotic nuclei were identified. Neuropil spongiosis and perivascular cuffing were also prominently observed at the infarcted area. The present study demonstrated the features of MRI and histopathologic findings in canine ischemic stroke models.
Lee, Seungmin,Moon, Byung Joon,Lee, Hyun Jung,Bae, Sukang,Kim, Tae-Wook,Jung, Yong Chae,Park, Jong Hyeok,Lee, Sang Hyun American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.20
<P>In this study, we developed reduced graphene oxide (rGO)-incorporated porous agarose (Ar-rGO) composites that were prepared via a “one-pot” sol-gel method involving a mixing and vacuum freeze-drying process. These composites represent an easy-to-use adsorbent for organic contaminant removal. Ar-rGOs can efficiently adsorb organic molecules, especially aromatic organic compounds from wastewater, because of the synergistic effect between the agarose bundles, which function as a water absorption site, and the rGO sheets, which function as active sites for pollutant binding. The pore structures and morphology of the Ar-rGO composites varied according to the added rGO, resulting in effective water infiltration into the composites. The main adsorption mechanism of the aromatic organic compounds onto Ar-rGOs involved π-π interactions with the rGO sheets. The surface interaction was more effective for adsorbing/desorbing the aromatic pollutants than the electrostatic interaction via the O-containing functional groups. In addition, we confirmed that Ar-rGO is highly stable over the entire pH range (1-13) because of the presence of the rGO sheets.</P> [FIG OMISSION]</BR>
Lee, Chang Hyeok,Lim, Hyo Jin,Park, Jae Hyoung,Kim, Jung Hyun,Kim, Jung Soo,Jeong, Min Joon,Song, Min Kyung,Kim, Si Hwan,Hwang, Su Min,Eom, Tae Kang,Lee, Min Jung,Lee, Yang,Ryu, Sung Ju The Kangwon-Kyungki Mathematical Society 2013 한국수학논문집 Vol.21 No.3
We continue the study of power-Armendariz rings over IFP rings, introducing $k$-power Armendariz rings as a generalization of power-Armendariz rings. Han et al. showed that IFP rings are 1-power Armendariz. We prove that IFP rings are 2-power Armendariz. We moreover study a relationship between IFP rings and $k$-power Armendariz rings under a condition related to nilpotency of coefficients.
NMR Study of the pH Effect on the DNA Binding Affinity of Human RPA
Lee, Min-Woo,Choi, Ju-Hyeok,Choi, Jae-Gyu,Lee, Ae-Ree,Lee, Joon-Hwa 한국자기공명학회 2016 Journal of the Korean Magnetic Resonance Society Vol.20 No.3
The replication protein A (RPA) plays a crucial role in DNA replication, recombination, and repair. RPA consists of 70, 32 and 14 kDa subunits and has high single-stranded DNA (ssDNA) binding affinity. The largest subunit, RPA70, mainly contributes to bind to ssDNA as well as interact with many cellular and viral proteins. In this study, we performed nuclear magnetic resonance experiments on the complex of the DNA binding domain A of human RPA70 (RPA70A) with ssDNA, d(CCCCC), at various pH, to understand the effect of pH on the ssDNA binding of RPA70A. The chemical shift perturbations of binding residues were most significant at pH 6.5 and they reduced with pH increment. This study provides valuable insights into the molecular mechanism of the ssDNA binding of human RPA.
Efficient adsorption of sulfide gas using porous zeolite powder
Lee Sang-hwa,Jeon Young Pyo,Lee Young Jun,La Yunju,Song Jun Yong,Park Yong Yeol,Lee Eun Jung,Jeon Ok Sung,Park Sang Yoon,Yoo Young Joon,Yang Keun-Hyeok 한국물리학회 2021 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.79 No.12
We prepared zeolite 13× beads and 10% zeolite 13× bead-embedded water-permeable blocks using porous zeolite powder. The difference in the surface state and pore structure of the zeolite powder and bead was analyzed through scanning electron microscopy and Brunauer–Emmett–Teller measurements. The process for making zeolite beads partially damaged their surface. Furthermore, the pore structure of the zeolite beads changed from micropores to a mixture of micro- and mesopores. The sulfur oxide ( SOx) adsorption efficiency of zeolite powder, beads, and blocks was evaluated. The initial SOx adsorption efficiency of zeolite beads decreased after washing ten times, but the increase in SOx concentration after initial adsorption was very small. The SOx adsorption efficiency of the block was very high even after washing ten times. These results indicate that the block is promising for applications requiring the adsorption of harmful gases such as SOx and NOx.
이종철,이석호,이규택,김재준,이종균,고광철,이풍렬,최규완,이준혁,오영륜,박근칠 대한소화기내시경학회 1998 Clinical Endoscopy Vol.18 No.3
Pseudomyxoma peritonei is a benign mucin producing tumor of the peritoneum which is usually diagnosed using a laparotomy. It is uncommon to find a case of pseudomyxoma peritonei which has been diagnosed using a peritoneoscopy in Korea; there are only two cases reported in the literature. We recently experienced a case of pseudomyxoma peritonei in a 61 year old woman who manifested a typical case using a peritoneoscopy. Thick, jelly-like materials were adherent to polypoid nodular masses of the parietal peritoneum, which originated from the mucinous cystadenocarcinoma of an ovary. In this report we discuss the case with relevant review of the literature.
(Joon Hyeok Kwak),(Kwang Won Hong),(Sung Haeng Lee),(Jin Han Hong),(Se Yong Lee) 생화학분자생물학회 1999 BMB Reports Vol.32 No.1
The first step of the branch pathway in tryptophan biosynthesis is catalyzed by anthranilate synthase, which is subjected to feedback inhibition by the end product of the pathway. The trpE^(FBR) gene from a mutant Escherichia coli strain coding for anthranilate synthase that was insensitive to feedback inhibition by tryptophan has been cloned. To identify the amino acid changes involved in the feedback regulation of anthranilate synthase, the nucleotide sequence of the mutant trpE^(FBR) gene was determined. Sequence analysis of the trpE^(FBR) gene revealed that four bases were changed in the structural gene while alteration was not found in the 5` control region. Among these base changes, only two base substitutions caused the alterations in amino acid sequences. From the results of restriction fragment exchange mapping, the 61st nucleotide, C to A substitution, that changed Pro^(21)→Ser was identified as the cause of the desensitization to feedback inhibition by tryptophan. Additional feedback-resistant enzymes of the E. coli anthranilate synthases were constructed by sitedirected mutagenesis to examine the effect of the Ser^(40)→Arg^(40) change found in the trpE^(FBR) gene of Brevibacterium lactofermentum. From the feedback inhibition analysis, the Pro^(21)→Ser and Ser^(40)→Arg mutants maintained about 50% and 90% of their maximal activities, respectively, even at the extreme concentration of 10 mM tryptophan. From these results, we suggest that the Pro^(21) and Ser^(40) residues are involved in the tryptophan binding in the E. coli enzyme.