https://repository.kopri.re.kr/handle/201206/15846 2026-04-05T21:41:13Z https://repository.kopri.re.kr/handle/201206/16127 Title: Genome analysis of Arctic soft rot bacterial pathogens and comparative analysis with a Korean isolate Authors: Kim, Dockyu; Jeon, Jehyun; Woo, Sungho; Kim, Mincheol; Kim, Han-Woo; Lee, Yung Mi Abstract: Soft rot-causing Pseudomonas spp. strains (G4-2, BA90-3, and CAM17-5) isolated from Arctic rhizosphere soils and a freshwater lake sediment, along with the Korean isolate Pectobacterium carotovorum KACC16999, were used for comparative analysis of metabolic traits and pathogenicity. Each genome consisted of a single circular chromosome and contained no plasmids: 6.1 Mb with a G + C content of 59.47% for G4-2; 7.1 Mb and 60.47% for BA90-3; 6.1 Mb and 59.93% for CAM17-5; 5.3 Mb and 51.57% for KACC 16999. Comparative analysis using RAST server revealed that five Arctic isolates (including Arctic soft rot pathogens Pseudomonas strains N3-W and G2-4) possess broader meta- bolic gene repertoires than KACC16999, particularly in amino acid and carbohydrate metabolism categories. These traits suggest their adaptation to Arctic oligotrophic environments. 2025-09-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/16144 Title: An architecting binder derived from Antarctic red algae to accelerate sulfur redox kinetics in Li-S batteries Authors: Jung, Han Young; Jung, Hyun Wook; Koo, Man Hyung; Hong, Tae Hwa; Kim, Dong Jun; Lee, Jung Seok; Lee, Yoon Hak; Jang, Hyeonji; Kim, Jin-Hyoung; Kim, Sanghee; Heo, Eun Jin; Lee, Seulah; Youn, Ui Joung; Lee, Jung Tae Abstract: Volume changes during charge/discharge cycles can lead to substantial cracking, disrupting electron and ion transfer channels, and hindering the performance of lithium-sulfur (Li-S) batteries. Binders are crucial for mitigating these issues because they preserve the structural integrity of electrodes and ensure reliable operation. Herein, this study presents the first report of a hybrid carrageenan, Antarctic macroalgae Curdiea racovitzae-derived polysaccharide (CRP), consisting of a diverse-blocked copolymer including kappa, iota, mu, nu carrageenans, and porphyran as Li-S battery binders. CRP prevents binder agglomeration and enables the electrode to form a uniform 3D-network structure reminiscent of an ant tunnel, enhancing the electrolyte permeability and utilization of the sulfur species. Additionally, the abundant functional groups in CRP, such as sulfate and hydroxyl groups, facilitate efficient Li- ion transport. By leveraging these properties, the CRP-based sulfur electrode achieves a high initial capacity of similar to 1500 mAh g 1 at 0.1C, approximately 90 % of the theoretical capacity, and demonstrates superior cycle stability at 1C. Moreover, the Li2S nucleation rate was nearly 100 times higher compared to the PVDF-based sulfur electrode. The incorporation of a sustainable CRP binder in Li-S batteries marks a notable breakthrough, paving the way for future developments in the battery field. 2025-01-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/16048 Title: Morphology and molecular characterization of a new Chloroidium (Trebouxiophyceae, Chlorophyta) species isolated from lichen in Antarctica Authors: Chae, Hyunsik; Lee, Yung Mi; Lee, Hyodong; So, Jae Eun; So, Jeongha; Choi, Han-Gu; Kim, Sanghee; Kim, Ji Hee Abstract: Antarctica's harsh environment supports a unique diversity of microalgae that inhabit freshwater, soil and snow, and engage in symbiotic associations with lichens. Among these, the photosynthetic eukaryotic algae in lichens primarily exhibit Chlorella-like morphology, which complicates their identification as a result of the simplicity of their form. In the present study, we aimed to identify a Chlorella-like strain isolated from the lichen Psoroma antarcticum in Antarctica based on its morphological and molecular characteristics. The strain PAMC 29142 showed ellipsoidal to almost spherical cells with parietal chloroplasts and reproduced through equally sized autospores, closely resembling other members of the genus Chloroidium. The phylogenetic analyses using nuclear small subunit and internal transcribed spacer rDNA sequences data confirmed that PAMC 29142 represents a distinct lineage within the genus. Internal transcribed spacer 2 secondary structures and the compensatory base changes approach were used to compare this strain with other Chloroidium species. Based on comprehensive morphological and molecular data, we propose the designation of PAMC 29142 as a new species, Chloroidium psoromicola sp. nov. 2025-01-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/16065 Title: Methane trapping in permafrost soils: a biogeochemical dataset across Alaskan boreal-Arctic gradient Authors: Kim, Jinhyun; Kim, Yongwon; Nam, Sungjin; Jung, Ji Young; Kim, You Jin; Hwang, Jeong Ho; Kim, Mincheol Abstract: Permafrost soils store vast amounts of organic carbon, and their thawing due to climate warming accelerates the release of carbon as methane and carbon dioxide, exacerbating global climate change. Understanding the distribution of greenhouse gases trapped in these soils and predicting their behavior upon thawing is essential for accurately modeling climate feedbacks. This study presents an integrated biogeochemical and microbial dataset from similar to 1.8 m deep soil cores collected across a 970 km latitudinal gradient in Alaskan permafrost regions, spanning boreal forest and Arctic tundra biomes. This dataset includes vertical profiles of trapped greenhouse gases, their stable isotope signatures, soil physicochemical properties, and the composition and abundance of key methanogenic and methanotrophic genes. These data provide critical insights into methane cycling within permafrost soils in high-latitude ecosystems and contribute to refining the parameterization of biogeochemical processes in climate models, especially in the context of accelerating permafrost thaw. 2025-01-01T00:00:00Z