DSpace Collection:https://repository.kopri.re.kr/handle/201206/121272026-04-21T03:34:19Z2026-04-21T03:34:19ZLongitudinal gut microbiota dynamics in Antarctic research mission crewsLee, Min-JungLee, Seung-HwanMin, HuitaeNam, Tae-WookHong, Soon GyuOh, BumjoKim, Joo HyeongKim, Yeon-RanKim, Bong-SooSeok, Yeong-Jaehttps://repository.kopri.re.kr/handle/201206/160352025-08-22T05:00:56Z2025-01-01T00:00:00ZTitle: Longitudinal gut microbiota dynamics in Antarctic research mission crews
Authors: Lee, Min-Jung; Lee, Seung-Hwan; Min, Huitae; Nam, Tae-Wook; Hong, Soon Gyu; Oh, Bumjo; Kim, Joo Hyeong; Kim, Yeon-Ran; Kim, Bong-Soo; Seok, Yeong-Jae
Abstract: Introduction A prolonged stay at Antarctic research stations poses unique challenges due to extreme environmental conditions, restricted diets, and cold temperatures, all of which can influence the gut microbiota, an important factor in host health. However, our understanding of how the Antarctic environment affects the gut microbiota remains limited due to small cohort sizes and short study durations.Methods We analyzed 467 fecal samples collected longitudinally from 48 participants who stayed at Antarctic stations for up to 16 months.Results Before departing to the Antarctic bases, male participants exhibited three distinct types of gut microbiota, which were differentially altered during and after the stay, depending on the pre-existing microbiota type. Prevotella-dominant microbiota was more susceptible to environmental changes, including the diet, compared with Bacteroides-dominant microbiota. Although the dominant genera in the gut microbiota were stable across all microbiota types, minor genera with high variability could mediate changes in the microbiota. Sharing diets and having frequent contact resulted in cohabitation effects among genetically unrelated participants in the extremely isolated Antarctic environment. Although taxonomic composition shifted in response to the Antarctic environment, predicted functions of the gut microbiota remained relatively stable.Discussion This study reveals that long-term residence in Antarctic research stations alters the gut microbiota in ways that depends on the intrinsic microbiota prior to the mission. These findings enhance our understanding of human gut microbiota adaptation under extreme and isolated environmental conditions.2025-01-01T00:00:00ZArctic Development in Russia and Its Impacts on Local Communities최우익https://repository.kopri.re.kr/handle/201206/137632022-08-26T07:11:35Z2022-05-16T00:00:00ZTitle: Arctic Development in Russia and Its Impacts on Local Communities
Authors: 최우익2022-05-16T00:00:00ZIcephobic Coating through a Self-Formed Superhydrophobic Surface Using a Polymer and Microsized ParticlesMoon, Chan HuiYasmeen, SumairaPark, KihoGaiji, HoudaChung, ChanghyunKim, Hyoung-KwonMoon, Hyoung-SeokChoi, Jang WookLee, Han-Bo-Ramhttps://repository.kopri.re.kr/handle/201206/132612022-03-24T07:15:30Z2022-01-01T00:00:00ZTitle: Icephobic Coating through a Self-Formed Superhydrophobic Surface Using a Polymer and Microsized Particles
Authors: Moon, Chan Hui; Yasmeen, Sumaira; Park, Kiho; Gaiji, Houda; Chung, Changhyun; Kim, Hyoung-Kwon; Moon, Hyoung-Seok; Choi, Jang Wook; Lee, Han-Bo-Ram
Abstract: Icephobic coatings have been extensively studied for decades to overcome the potential damage associated with ice formation in various devices that are operated under harsh weather conditions. Superhydrophobic surface coatings have been applied for icephobic coating applications owing to their low surface energy. In this study, an icephobic coating of a self-formed superhydrophobic surface using polydimethylsiloxane (PDMS) and SiO2 powder was investigated. The effect of superhydrophobicity on icephobicity was determined by varying the experimental parameters. Polyvinylidene fluoride (PVDF) was added to the PDMS solution to improve the mechanical properties of the icephobic layer. The PDMS-PVDF solution also showed the self-formation behavior into a superhydrophobic surface. In addition, the icephobicity and mechanical properties of the PDMS-PVDF mixture coating improved because of the multilevel nanostructure formed by physical and chemical interactions between the mixture and SiO2 powder. We believe that the proposed approach will be a suitable candidate for various practical applications of icephobicity, as well as a model system to understand the correlation between superhydrophobicity and icephobicity.2022-01-01T00:00:00ZHydrogeological characteristics of active layers near King Sejong StationJeen, Sung-Wookhttps://repository.kopri.re.kr/handle/201206/121932022-03-24T07:14:58Z2021-02-25T00:00:00ZTitle: Hydrogeological characteristics of active layers near King Sejong Station
Authors: Jeen, Sung-Wook2021-02-25T00:00:00Z