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Enhancing acid tolerance of Leuconostoc mesenteroides with glutathione.
Kim, Ji Eun,Eom, Hyun-Ju,Kim, Yujin,Ahn, Ji Eun,Kim, Jeong Hwan,Han, Nam Soo Kluwer Academic Publishers 2012 Biotechnology letters Vol.34 No.4
<P>Leuconostoc mesenteroides is a commercially important lactic acid bacterium currently used as a starter for kimchi and kefir. However, its sensitivity to acid stress limits its performance. L. mesenteroides was grown in a medium supplemented with 3.2 or 6.4 mM glutathione (GSH), and cell survival rates were measured during a long-term mild acid challenge (pH 4.0). As a result, GSH was imported by the cells and protected against acid stress; thereafter it was consumed as a nutrient. Acid stress resistance of starter cultures of this bacterium can thus be improved by cultivating it in media supplemented with GSH.</P>
U-Net을 활용한 복부 CT 영상에서의 비장 자동 분할을 위한 데이터 증강 및 다중 채널 입력에 대한 연구
정유진(Yujin Jung),김현지(Hyeon Ji Kim),유상훈(Sang Hoon Ryu),최영찬(Young Chan Choi),김근태(Geun Tae Kim),이현지(Hyun Ji Lee),문준범(Jun Beom Moon),정순기(Soon Ki Jung) 한국정보기술학회 2024 Proceedings of KIIT Conference Vol.2024 No.5
본 연구에서는 복부 CT 영상으로부터 U-Net 기반의 딥러닝 모델을 통해 비장을 자동으로 분할하는 방법을 제안한다. 본 논문에서 제안하는 방법은 다양한 범위의 Hounsfield Unit으로 전처리된 영상을 동시에 활용하여 더 풍부한 특징을 추출하기 위해 다채널 입력 구조를 적용하였으며, 데이터 불균형 문제 해소와 성능 향상을 위해 Random Crop, Gaussian Noise, Elastic Transform과 같은 데이터 증강을 적용하였다. 제안된 모델은 MICCAI FLARE22 Challenge Dataset을 통해 학습되었으며, 제거 분석을 통해 제안된 두 기법의 효과를 검증하였다. 본 논문에서 제안하는 방법은 다채널 입력과 데이터 증강을 적용함으로써, 이를 적용하기 이전과 비교하여 DSC에서 0.2%, IoU에서 0.25%의 성능 향상을 보였다. In this study, we propose a method to automatically segment the spleen from abdominal CT images using a deep learning model based on U-Net. The method proposed in this paper is based on U-Net, which simultaneously utilizes images preprocessed with various ranges of HounsField Units to extract richer features, and applies a multi-channel input structure to extract richer features, and data augmentation such as Random Crop, Gaussian Noise, and Elastic Transform to solve the problem of data imbalance and improve performance. The proposed model is trained on the MICCAI FLARE22 Challenge Dataset, and the effectiveness of the proposed two techniques is verified through the ablation study. By applying multichannel inputs and data augmentation, the proposed method shows a performance improvement of 0.2% in DSC and 0.25% in IoU compared to the previous method.
Lee Yujin,Jang Jiyoon,Bibi Maimoona,Duggirala Krishna Babu,Ji Sang Hee,Lee Ji Hun,Ahn Sunjoo,Song Jin Sook,Chae Chong Hak,Kim Seong Hwan,Lee Kwangho 대한화학회 2021 Bulletin of the Korean Chemical Society Vol.42 No.6
Apoptosis signal-regulating kinase 1 (ASK1) is a member of mitogen-activated protein kinase kinase kinase (MAP3K) family that involves downstream phosphorylation of MAP kinases, c-Jun N-terminal kinases, and p38 MAP kinases. ASK1 inhibitors could possibly be beneficial for ameliorating the development and progression of diseases. Especially, ASK1 has been of interest as one of therapeutic targets for nonalcoholic fatty liver disease as the most common chronic liver diseases including simple steatosis and nonalcoholic steatohepatitis. In this manuscript, novel ASK1 inhibitor lead KTA-29 which has an imidazo [1,2-b]pyridazine core with novel C6-bicycloheptaneimidazole is disclosed. With the novel imidazo[1,2-b] pyridazine core, structure-activity-relationship study for ASK1 potency is described and KTA-29 affinity toward ASK1 with molecular modeling study is explained.
Yujin Seong,Dami Yim,Min Ji Jang,Jeong Min Park,Seong Jin Park,Hyoung Seop Kim 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.2
A physics-based constitutive model of porous materials is proposed to enhance the accuracy of numerical analysis in die/isostatic compaction. The correlation between the yield function and equivalent work equation was derived, and the numericalintegration method was modifed with the correlation. It is found that the apparent work of porous materials is lower than theproduct of relative density and equivalent work of solid materials at the beginning of compaction, implying the kinematicmotion of powders and the resultant particle rearrangement. For verifcation of the proposed model, fnite element analyseswere performed for the die/isostatic compaction of three metal powders: Ti, SUS316L, and Al6061 powders. Compared withtwo conventional constitutive models, the proposed model improves the accuracy of the densifcation behaviors in all thestage during die/isostatic compaction. Furthermore, this study is a groundwork to link the densifcation behavior of porousmaterials at bulk scale to the particulate behavior of powders at microscale.
Virus-Based Structural Color Sensor for the Endocrine Disrupting Chemicals Detection
Yujin Lee,Ye-Ji Kim,Thanh Mien Nguyen,Yeong Ju Lee,You Hwan Kim,Seung Su Jeong,Jae Suk Yoon,Na Yeung Kim,Jun Su Choi,Min Soo Kim,Jin Jae Park,Suk Ho Lee,Eun Jung Choi,Jin-Woo Oh 한국고분자학회 2019 한국고분자학회 학술대회 연구논문 초록집 Vol.44 No.2
Yujin Kim,Yeon Bee Kim,Juseok Kim,Joon Yong Kim,Tae Woong Whon,Won-Hyong Chung,Eun-Ji Song,Young-Do Nam,Se Hee Lee,Seong Woon Roh 한국미생물학회 2022 The journal of microbiology Vol.60 No.7
Two Gram-stain-positive, oxidase-negative, catalase-positive, and coccus-shaped bacterial strains, designated CBA3104T and CBA3105T, were isolated from kimchi. Strain CBA3104T and CBA3105T grew at 10–35°C (optimum, 25°C and 30°C, respectively), at pH 6.0–8.5 (optimum, pH 6.5), and in the presence of 0–15% (w/v) NaCl (optimum, 5%). A phylogenetic analysis based on 16S rRNA gene sequences revealed that strain CBA3104T formed a distinct phylogenetic lineage within the genus Brachybacterium whereas strain CBA3105T was closely positioned with Brachybacterium halotolerans MASK1Z-5T. The 16S rRNA gene sequence similarity between strains CBA3104T and CBA3105T was 99.9%, but ANI and dDDH values between strains CBA3104T and CBA3105T were 93.61% and 51.5%, respectively. Strain CBA3104T showed lower ANI and dDDH values than species delineation against three closely related strains and type species of the genus Brachybacterium, however, strain CBA3105T showed 96.63% ANI value and 69.6% dDDH value with Brachybacterium halotolerans MASK1Z-5T. Among biochemical analysis results, strain CBA3104T could uniquely utilize bromo-succinic acid whereas only strain CBA3105T was positive for alkaline phosphatase and α-fucosidase among two novel strains, closely related strains, and type species of the genus Brachybacterium. Compared with strain CBA3105T and Brachybacterium halotolerans JCM 34339T, strain CBA3105T was differentially positive for acid production of D-arabinose, D-adonitol, and potassium 5-ketogluconate and enzyme activity of β-glucuronidase. Both strains contained menaquinone-7 as the dominant quinone. The cell-wall peptidoglycan of two novel strains contained meso-diaminopimelic acid. The major fatty acids of strains CBA3104T and CBA3105T were anteiso-C15:0, anteiso-C17:0, and iso-C16:0. The major polar lipids of both strains were phosphatidylglycerol and diphosphatidylglycerol. Strain CBA3104T possessed a uniquely higher abundance of tRNA (97 tRNAs) than four Brachybacterium strains used for comparative taxonomic analysis (54–62 tRNAs). Both the CBA3104T and CBA3105T strain harbored various oxidoreductase, transferase, hydrolase, and lyase as strain-specific functional genes compared to closely related strains and Brachybacterium type species. The results of biochemical/physiological, chemotaxonomic, and genomic analyses demonstrated that strains CBA3104T and CBA3105T represent a novel species of the genus Brachybacterium and a novel subspecies of B. halotolerans, respectively, for which the names Brachybacterium kimchii sp. nov. and B. halotolerans subsp. kimchii subsp. nov. are proposed. The type strains of the novel species and the novel subspecies are CBA3104T (= KCCM 43417T = JCM 34759T) and CBA3105T (= KCCM 43418T = JCM 34760T), respectively.
Yujin Byun,Chanyoung Seo,Ho Young Jo,Young Jae Lee,Ji-Hun Ryu,Hye-Yoon Chong,Seong-Wan Park 한국방사성폐기물학회 2022 한국방사성폐기물학회 학술논문요약집 Vol.20 No.2
Deep geological disposal is generally accepted to be the most practical approach to handling radioactive wastes. Bentonite has been considered as a buffer material in deep geological disposal repositories (DGR) for high-level radioactive wastes. Evaluating the effect of short-term bentonite alteration on EBS performance has limitations in safety assessment over thousands of years. Information on bentonite characteristics under various conditions obtained from natural systems can be used to evaluate long-term safety of bentonite buffer. The purpose of this study was to investigate mineralogical and physicochemical characteristics of bentonite in the Naah mine located in Yangnam-myeon, Gyeongju-si for a natural analogue of the bentonite barrier in DGR. A total of 15 samples were collected at regular intervals from the bentonite layer and andesitic lapilli tuff (i.e., parent rock) at the boundary with the bentonite layer. The bentonite layer is located at a depth of about 1 m below the ground surface. Each sample was separated into particles < < 75 μm and particles < 2 μm through grinding and sedimentation processes. The separated subsamples were characterized mineralogically and physiochemically using various analytic techniques. Bentonite samples have a similar SiO2/Al2O3 ratio to the parent rock and a lower (Na+K)/Si ratio than the parent rock, indicating depletion of alkali components during bentonitization. The parent rock and bentonite samples have similar mineral composition (i.e., quartz, feldspars, opal-cristobalite-tridymite and montmorillonite). Results of XRD analysis on the randomly distributed particles < 2 μm indicate that bentonite is mostly composed of Ca-montmorillonite, which is a typical dioctahedral smectite. Results of FTIR and VNIR analysis indicate that montmorillonite contained in bentonite is Al-dioctahedral montmorillonite, and Al is substituted with Mg in some octahedron units. The mineralogical and physicochemical characteristics are similar regardless of sampling location. These results suggest that bentonite potentially exposed to weathering, located near the ground surface, has hardly altered.