https://repository.kopri.re.kr/handle/201206/5399 Tue, 21 Apr 2026 12:05:36 GMT 2026-04-21T12:05:36Z https://repository.kopri.re.kr/handle/201206/9530 Title: Genomic Insight Into the Predominance of Candidate Phylum Atribacteria JS1 Lineage in Marine Sediments Authors: Chun, Jongsik; Lee, Hong Kum; Shin, Seung Chul; Hong, Soon Gyu; Choi, Hakkyum; Noh, Hyun-Ju; Kim, Mincheol; Hwang, Chung Yeon; Lee, Jae Il; Hwang, Kyuin; Lee, Yung Mi Abstract: Candidate phylum Atribacteria JS1 lineage is one of the predominant bacterial groups in anoxic subseafloor sediments, especially in organic-rich or gas hydrate-containing sediments. However, due to the lack of axenic culture representatives, metabolic potential and biogeochemical roles of this phylum have remained elusive. Here, we examined the microbial communities of marine sediments of the Ross Sea, Antarctica, and found candidate phylum Atribacteria JS1 lineage was the most abundant candidate phylum accounting for 9.8？40.8% of the bacterial communities with a single dominant operational taxonomic unit (OTU). To elucidate the metabolic potential and ecological function of this species, we applied a single-cell genomic approach and obtained 18 single-cell amplified genomes presumably from a single species that was consistent with the dominant OTU throughout the sediment. The composite genome constructed by co-assembly showed the highest genome completeness among available Atribacteria JS1 genomes. Metabolic reconstruction suggested fermentative potential using various substrates and syntrophic acetate oxidation coupled with hydrogen or formate scavenging methanogens. This metabolic potential supports the predominance of Atribacteria JS1 in anoxic environments expanding our knowledge of the ecological function of this uncultivated group. Thu, 29 Nov 2018 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/9530 2018-11-29T00:00:00Z https://repository.kopri.re.kr/handle/201206/6403 Title: Late Quaternary glaciation in the Nun-Kun massif, northwestern India Authors: Lee, Soo Young; Yoo, Kyu-Cheul; Yoon, Ho Il; Lim, Hyoun Soo; Madhav K. Murari; Lewis A. Owen; Seong, Y.B. Abstract: The late Quaternary glacial history of the Nun-Kun massif, located on the boundary between the Greater Himalaya and the Zanskar range in northwestern India, was reconstructed. On the basis of morphostratigraphy and 10Be dating of glacial landforms (moraines and glacial trimlines), five glacial stages were recognized and defined, namely: (i) the Achambur glacial stage dated to Marine Oxygen Isotope Stage 3 to 4 (38.7？ 62.7 ka) (ii) the Tongul glacial stage dated to the early part of the Lateglacial (16.7？ 17.4 ka) (iii) the Amantick glacial stage dated to the later part of the Lateglacial (14.3 ka, 11.7？ 12.4 ka) (iv) the Lomp glacial stage dated to the Little Ice Age and (v) the Tanak glacial stage, which has the youngest moraines, probably dating to the last few decades or so.ndforms (moraines and glacial trimlines), five glacial stages were recognized and defined, namely: (i) the Achambur glacial stage dated to Marine Oxygen Isotope Stage 3 to 4 (38.7？ 62.7 ka) (ii) the Tongul glacial stage dated to the early part of the Lateglacial (16.7？ 17.4 ka) (iii) the Amantick glacial stage dated to the later part of the Lateglacial (14.3 ka, 11.7？ 12.4 ka) (iv) the Lomp glacial stage dated to the Little Ice Age and (v) the Tanak glacial stage, which has the youngest moraines, probably dating to the last few decades or so. Wed, 01 Jan 2014 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/6403 2014-01-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/6521 Title: Stream Water and Groundwater Interaction Revealed by Temperature Monitoring in Agricultural Areas Authors: Lee, Jin-Yong; Lim, Hyoun Soo; Yoon, Ho Il; Park, Youngyun Abstract: Variations in stream water, streambed, adjacent stream sediment, and groundwater temperatures in the Haean basin, Korea were examined using time series analyses including auto-correlation, spectral density, and cross-correlation functions. The temperatures of the ambient air, stream water, streambed (depth = 10 cm), and adjacent stream sediment (depth = 10 cm) showed distinctive diurnal variations with long-term seasonal cooling trends, while groundwater temperature showed only a seasonal decreasing trend with little diurnal variations. Auto-correlations and spectral densities of the stream water, streambed, and sediment temperatures also revealed strong daily cyclical behaviors, with longer periodic cycles varying from weekly to monthly. Amplitudes and lag times of the streambed thermal signals were also affected by the hydraulic conductivities of the sediments. Lower hydraulic conductivity indicates a more attenuated and slower thermal response for the streambed. The calculated vertical water flow velocities of the streambed revealed that the investigated stream locations were under losing or gaining conditions, depending on the location and time. Tue, 01 Jan 2013 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/6521 2013-01-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/6121 Title: Late Pleistocene-Holocene records from Lake Ulaan, southern Mongolia: implications for east Asian palaeomonsoonal climate changes Authors: Hyoun Soo Lim; Yoon, Ho Il; Yong Il Lee; Lee, Min Kyung; Lee, Jae Il Abstract: A 5.88-m-long core taken from Lake Ulaan was studied for high-resolution paleoclimatic changes during the last 17000 years. These sediments were transported by local westerly winds and fluvial processes. The records of total organic carbon, C/N ratio and weathering intensity suggest that paleoclimate in the source area of Lake Ulaan sediment was most humid during the Early Holocene, humid during the mid-Holocene and dry in the Late Holocene. The decrease of humidity through the Holocene is a typical characteristic of the East Asian monsoon region. Comparison with lacustrine records of other Mongolia regions suggests that the northern boundary of East Asian summer-monsoon influence could have been located further north than previously assumed.on, C/N ratio and weathering intensity suggest that paleoclimate in the source area of Lake Ulaan sediment was most humid during the Early Holocene, humid during the mid-Holocene and dry in the Late Holocene. The decrease of humidity through the Holocene is a typical characteristic of the East Asian monsoon region. Comparison with lacustrine records of other Mongolia regions suggests that the northern boundary of East Asian summer-monsoon influence could have been located further north than previously assumed. Tue, 01 Jan 2013 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/6121 2013-01-01T00:00:00Z