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Kim Woon-ki,Min Sung-gyu,Kwon Heeun,Park SungJun,Jo Min Jung,Ko GwangPyo 한국미생물학회 2023 The journal of microbiology Vol.61 No.7
Ulcerative colitis, a major form of inflammatory bowel disease (IBD) associated with chronic colonic inflammation, may be induced via overreactive innate and adaptive immune responses. Restoration of gut microbiota abundance and diversity is important to control the pathogenesis. Lactobacillus spp., well-known probiotics, ameliorate IBD symptoms via various mechanisms, including modulation of cytokine production, restoration of gut tight junction activity and normal mucosal thickness, and alterations in the gut microbiota. Here, we studied the effects of oral administration of Lactobacillus rhamnosus (L. rhamnosus) KBL2290 from the feces of a healthy Korean individual to mice with DSS-induced colitis. Compared to the dextran sulfate sodium (DSS) + phosphate-buffered saline control group, the DSS + L. rhamnosus KBL2290 group evidenced significant improvements in colitis symptoms, including restoration of body weight and colon length, and decreases in the disease activity and histological scores, particularly reduced levels of pro-inflammatory cytokines and an elevated level of anti-inflammatory interleukin-10. Lactobacillus rhamnosus KBL2290 modulated the levels of mRNAs encoding chemokines and markers of inflammation; increased regulatory T cell numbers; and restored tight junction activity in the mouse colon. The relative abundances of genera Akkermansia, Lactococcus, Bilophila, and Prevotella increased significantly, as did the levels of butyrate and propionate (the major short-chain fatty acids). Therefore, oral L. rhamnosus KBL2290 may be a useful novel probiotic.
Lactobacillus acidophilus KBL409 Ameliorates Atopic Dermatitis in a Mouse Model
Kim Woon-ki,Jang You Jin,Park SungJun,Min Sung-gyu,Kwon Heeun,Jo Min Jung,Ko GwangPyo 한국미생물학회 2024 The journal of microbiology Vol.62 No.2
Atopic dermatitis (AD) is a chronic inflammatory skin disease with repeated exacerbations of eczema and pruritus. Probiotics can prevent or treat AD appropriately via modulation of immune responses and gut microbiota. In this study, we evaluated effects of Lactobacillus acidophilus (L. acidophilus) KBL409 using a house dust mite (Dermatophagoides farinae)-induced in vivo AD model. Oral administration of L. acidophilus KBL409 significantly reduced dermatitis scores and decreased infiltration of immune cells in skin tissues. L. acidophilus KBL409 reduced in serum immunoglobulin E and mRNA levels of T helper (Th)1 (Interferon-γ), Th2 (Interleukin [IL]-4, IL-5, IL-13, and IL-31), and Th17 (IL-17A) cytokines in skin tissues. The anti-inflammatory cytokine IL-10 was increased and Foxp3 expression was up-regulated in AD-induced mice with L. acidophilus KBL409. Furthermore, L. acidophilus KBL409 significantly modulated gut microbiota and concentrations of short-chain fatty acids and amino acids, which could explain its effects on AD. Our results suggest that L. acidophilus KBL409 is the potential probiotic for AD treatment by modulating of immune responses and gut microbiota of host.
Choi, Sunho,Jang, Boyun,Kim, Joonsoo,Song, Heeun,Baek, Taehyeon,Han, Moonhee Elsevier 2015 SOLAR ENERGY -PHOENIX ARIZONA THEN NEW YORK- Vol.122 No.-
<P><B>Abstract</B></P> <P>Thin silicon (Si) wafers with thickness of 100–140μm were obtained by using a multi-wire slicing process with a SiC slurry. We investigated the process yields of wafer slicing as well as physical/electrical properties of the sliced wafers with various thicknesses. As the wafer thickness decreases, the process yield abruptly decreased due to wafer breakage during the slicing process, and conventional polishing the brick surface was not enough to gain a considerable process yield. However, elimination of defects on the brick surface by mirror polishing resulted in an 83.1% enhancement of yield even for wafers with a thickness of 100μm. The number of wafers obtained was even higher than that of conventional 180μm-thick wafers (479 vs. 415 wafers in this research). Investigation of the microstructure of brick surfaces revealed that surface defects on bricks were main parameter to determine the yield of slicing process. Surface defects containing the micro-cracks introduced residual stress, which decreased the slicing process yield especially for thinner wafers. From measurements of physical and electrical properties, it was revealed that the relative total thickness variations (TTVs) and bowings increased and the characteristic fracture strength of sliced wafer and conversion efficiencies decreased as the wafer thickness decreased. For the wafer with thickness of 100μm, the relative TTV and bowing were 14.1% and 22.5mm, respectively. The conversion efficiency of a solar cell using this wafer was 17.6%, while that of a conventional Si solar cell using a 180μm-thick wafer was 18.4%.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Thin silicon wafers with thickness of 100–140μm were sliced by multi-wire slicing. </LI> <LI> Physical and electrical properties of thin Si wafers were investigated. </LI> <LI> Subsurface defects of the brick surface critically determined process yield in slicing Si wafers. </LI> </UL> </P>
정신질환자의 민간보험 가입차별 문제에 대한 정책과정: 비판적 담론분석의 적용
주민지 ( Minji Ju ),김희언 ( Heeun Kim ),강민아 ( Minah Kang ) 한국사회보장학회 2017 사회보장연구 Vol.33 No.2
This study conducts a discourse analysis regarding the policy process of solving the discrimination against mentally-ill patients` purchasing private insurances, which have been discussed for over a decade. It has been constantly criticized as the problem of discrimination that the refusal to insure or provide coverage to the mentally-ill people with pre-existing conditions or even those who have any record of being treated. Therefore, this study focuses on the policy discourses which contain different views and interpretation on mentally-ill as a policy target group, and analyzes the contents and changes based on Fairclough`s Critical Discourse Analysis (CDA). To figure out the changing process of the set of values among policy stakeholder, the three dimensional analytical approaches of CDA - text analysis, discourse practice analysis, and sociocultural practice analysis - were used. Analysis of the flow of discourse of three periods respectively found that the policy stakeholders have not met a state of agreement, even on the key concepts including mental illness and mental disorder. Inevitably, the discourses on “mentally-ill” have been segmented into two tracks: the citizens with mild and recoverable symptoms and the citizens with severe mental disability. Regardless of the diverse policy alternatives raised for several years, the result of this study implies that an agreement on the concepts and ranges of mentally-ill people as policy target group will be able to minimize the institutional vacuum.