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Lactiplantibacillus plantarum WiKim0125 균주의 발효 최적화 및 스케일 업 공정 개발
김영열(Yeong Yeol Kim),김슬비(Seulbi Kim),김정환(Jung Hwan Kim),김호명(Ho Myeong Kim) 한국유산균프로바이오틱스학회 2023 Current Topic in Lactic Acid Bacteria and Probioti Vol.9 No.1
In probiotics production, lactic acid bacteria (LAB) are cultured on a large scale to achieve efficient processing through fermentation optimization and scale-up. In this Current study, the LAB strain Lactiplantibacillus plantarum WiKim0125 was isolated from kimchi and optimized the production. The optimization strategy for cultivating L. plantarum WiKim0125 consisted of investigating media components, selecting physiochemical conditions to enhance productivity, and scaling up for pilot-scale production. Each process condition was evaluated based on substrate consumption, lactic acid production, and viable cell yield. As a result, the final viable cell and lactic acid yield of L. plantarum WiKim0125 increased by 38.6% and 19.4%, respectively. This study provides an overview of fermentation optimization and scale-up processes for the industrial application of L. plantarum WiKim0125.
Seulbi Lee,Jaewoong Kim,Jungho Choe,Seong‑Woong Kim,Jae‑Keun Hong,최윤석 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.1
The crack formation mechanisms of Ti–48Al–2Cr–2Nb single tracks processed by laser powder bed fusion were extensivelyinvestigated in a wide range of laser powers and scan speeds. The crack patterns were categorized by their directionalities,which were parallel (longitudinal crack) and/or perpendicular (transverse crack) to the scan direction. For the representativeprocess conditions of the keyhole, transition, and conduction modes, cracking behaviors were characterized by combiningthe fractography and the microstructural analysis. Further, thermal-mechanical finite element method simulations wereperformed to predict the distribution of temperatures and thermal stresses during the melt pool formation. On the basis ofthe combined results, the cracks formed in keyhole, transition, and conduction modes were clarified as a solidification crackand/or a thermal crack. In addition, the formation of these cracks was thoroughly understood in terms of thermal stresses andmicrostructural factors that affect the crack susceptibility. Finally, comprehensive mechanisms responsible for cracking ofTi–48Al–2Cr–2Nb single tracks under laser powder bed fusion were proposed for different process conditions (the keyhole,transition and conduction modes).
Kim Seulbi,Kim Ho Myeong,Seo Hye Jeong,Yeon Jehyeong,Park Ae Ran,Yu Nan Hee,Jeong Seul-Gi,장지윤,김진철,박해웅 한국미생물·생명공학회 2022 Journal of microbiology and biotechnology Vol.32 No.8
Lactic acid bacteria (LAB) exert antagonistic activity against root-knot nematodes, mainly by producing organic acids via carbohydrate fermentation. However, they have not yet been used for root-knot nematode (Meloidogyne incognita) control owing to a lack of economic feasibility and effectiveness. In this study, we aimed to isolate organic acid-producing LAB from kimchi (Korean traditional fermented cabbage) and evaluated their nematicidal activity. Among the 234 strains isolated, those showing the highest nematicidal activity were selected and identified as Lactiplantibacillus plantarum WiKim0090. Nematicidal activity and egg hatch inhibitory activity of WiKim0090 culture filtrate were dose dependent. Nematode mortality 3 days after treatment with 2.5% of the culture filtrate was 100%, with a 50% lethal concentration of 1.41%. In pot tests, the inhibitory activity of an L. plantarum WiKim0090-copper sulfate mixture on gall formation increased. Compared to abamectin application, which is a commercial nematicide, a higher control value was observed using the WiKim0090-copper sulfate mixture, indicating that this combination can be effective in controlling the root-knot nematode.
Park, Eunkuk,Kim, Jeonghyun,Kim, Mun-Chang,Yeo, Subin,Kim, Jieun,Park, Seulbi,Jo, Miran,Choi, Chun Whan,Jin, Hyun-Seok,Lee, Sang Woo,Li, Wan Yi,Lee, Ji-Won,Park, Jin-Hyok,Huh, Dam,Jeong, Seon-Yong MDPI AG 2019 INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES Vol.20 No.11
<P>Osteoporosis is an abnormal bone remodeling condition characterized by decreased bone density, which leads to high risks of fracture. Previous study has demonstrated that Lycii Radicis Cortex (LRC) extract inhibits bone loss in ovariectomized (OVX) mice by enhancing osteoblast differentiation. A bioactive compound, kukoamine B (KB), was identified from fractionation of an LRC extract as a candidate component responsible for an anti-osteoporotic effect. This study investigated the anti-osteoporotic effects of KB using in vitro and in vivo osteoporosis models. KB treatment significantly increased the osteoblastic differentiation and mineralized nodule formation of osteoblastic MC3T3-E1 cells, while it significantly decreased the osteoclast differentiation of primary-cultured monocytes derived from mouse bone marrow. The effects of KB on osteoblastic and osteoclastic differentiations under more physiological conditions were also examined. In the co-culture of MC3T3-E1 cells and monocytes, KB promoted osteoblast differentiation but did not affect osteoclast differentiation. In vivo experiments revealed that KB significantly inhibited OVX-induced bone mineral density loss and restored the impaired bone structural properties in osteoporosis model mice. These results suggest that KB may be a potential therapeutic candidate for the treatment of osteoporosis.</P>
( Sook-young Park ),( Jongbum Jeon ),( Jung A Kim ),( Mi Jin Jeon ),( Nan Hee Yu ),( Seulbi Kim ),( Ae Ran Park ),( Jin-cheol Kim ),( Yerim Lee ),( Youngmin Kim ),( Eu Ddeum Choi ),( Min-hye Jeong ),( 한국균학회 2021 Mycobiology Vol.49 No.3
An endolichenic fungus, Xylaria grammica strain EL000614, showed strong nematicidal effects against plant pathogenic nematode, Meloidogyne incognita by producing grammicin. We report genome assembly of X. grammica EL000614 comprised of 25 scaffolds with a total length of 54.73 Mb, N50 of 4.60 Mb, and 99.8% of BUSCO completeness. GC contents of this genome were 44.02%. Gene families associated with biosynthesis of secondary metabolites or regulatory proteins were identified out of 13,730 gene models predicted.
Seulbi Lee,Jaewoong Kim,Do‑Sik Shim,박상후,최윤석 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.5
Single track and multi-layers of medium-carbon steel (AISI H13) powders were additively deposited on gray cast ironusing a directed energy deposition (DED) technique. Multi-scale microstructure characterization using a scanning electronmicroscopy, an electron probe micro-analyzer and a scanning transmission electron microscopy, and the thermal analysisusing finite element method were performed to understand the mechanism for the micro-crack formation, which was foundat the single, double and triple layers of medium-carbon steel powders, except for the single track, deposited on a cast ironsubstrate. The crack formation mechanism was thoroughly investigated by combining the layer-by-layer chemistry variationsand the resulting microstructural evolution upon exposure to thermal cycles during the DED process. It was concluded thatmicro-cracking was accompanied by the initiation of the local graphitization and the formation of plate martensite in thevicinity, which seemed to be kinetically facilitated by an indirect exposure to multiple heating–cooling thermal cycles, notby a direct exposure to a melting-cooling (solidification) cycle.