https://repository.kopri.re.kr/handle/201206/5396 2026-04-07T00:45:05Z https://repository.kopri.re.kr/handle/201206/8436 Title: Bacterial Community Change during Biofilm Development in the Arctic Marine Environment Authors: Jang-Cheon Cho; Tae-Kyoung Kim; Lee, Hong Kum; Hong, Soon Gyu; Lee, Yung Mi; Kyeung Hee Cho; Kim, Eun Hye Abstract: Biofilm is an important life form of microorganisms formed in aquatic environments including oral cavities, water supply systems, fresh water and marine environments. They affect human health and water quality. It also has important ecological roles in aquatic environments such as protection from environmental stress and efficient lysis of macromolecules. In this study, we analyzed bacterial community change during biofilm development in coastal area of Svalbard, Norway. High throughput sequencing technology was applied to determine bacterial community structures of biofilm samples collected once a day for 15 days. The major phyla were Bacteroidetes (45.4%), Alphaproteobacteria (38.6%), and Gammaproteobacteria (8.9%). Thirty two major OTUs (>2%) clustered by 97% sequence similarity cutoff mostly belonged to Rhodobacterales (26.5%) of Alphaproteobacteria and Flavobacteriales (15.2%) of Bacteroidetes. The major OTUs occupied approximately 45% of the whole community. They were assigned to the genera Arenicella, Flavivirga, Hoeflea, Litoreibacter, Maribacter, Octabecabacter, Pelagibacter, Planktomarina, Planktotlea, Polaribacter, Reseovarius, Ruthia, Sulfitobacter, Tenacibaculum and several candiatus genera. Some of them were major components in the early phase and the others were major in the late phase.logical roles in aquatic environments such as protection from environmental stress and efficient lysis of macromolecules. In this study, we analyzed bacterial community change during biofilm development in coastal area of Svalbard, Norway. High throughput sequencing technology was applied to determine bacterial community structures of biofilm samples collected once a day for 15 days. The major phyla were Bacteroidetes (45.4%), Alphaproteobacteria (38.6%), and Gammaproteobacteria (8.9%). Thirty two major OTUs (>2%) clustered by 97% sequence similarity cutoff mostly belonged to Rhodobacterales (26.5%) of Alphaproteobacteria and Flav 2012-01-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/8422 Title: Host species, fruiting body structure, and substrate dependency of microbial Authors: Park, Chae Haeng; Kim, Ok-Sun; Jeong, Gajin; Hong, Soon Gyu; Kim, Kyung Mo Abstract: Cladonia, Umbilicaria, Usnea, and crustose 지의류에서 미생물 군집구조 분석 2012-01-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/6328 Title: Possible multiple introductions of Cladonia borealis to King George Island Authors: Jeong, Gajin; Park, Chae Haeng; Hong, Soon Gyu Abstract: Many lichens have extensive distributional ranges covering several climatic zones and are able to colonize extreme habitats, including high alpine and polar regions. Cladonia borealis, one of the dominant lichen species on King George Island, is a cosmopolitan species inhabiting polar, subpolar, and alpine areas. It is usually found on soil, humus, and mosses, and is morphologically highly diverse. To understand the phylogeographic history of C. borealis on King George Island, we compared specimens from here with specimens from Norway and Chile. We conducted phylogenetic and haplotype network analyses of the partial SSU, ITS1-5.8S-ITS2, and partial LSU rDNA sequences including intron sequences in LSU rRNA genes. Nuclear rDNA locus of C. borealis from King George Island was separated into two monophyletic lineages. It is suggested that they originated in multiple independent introduction events after long-distance dispersal from other continents. 2012-01-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/8470 Title: Evolutionary relationships of polyketide synthase genes in lichen Cladonia spp. Authors: Noh, Hyun-Ju; Lee, Jin sung; Hong, Soon Gyu; Park, Chae Haeng Abstract: Lichens are well known for producing a great variety of secondary metabolites including polyketide chemicals. Polyketides are involved in stress responses such as drought, UV, microbial infection, and so on. Biosynthesis of polyketide chemicals are carried out by polyketide syntheses (PKS). Most of the lichens contain multiple copies of PKS genes and it is believed that each copy of the PKS gene is involved in biosyntheses of different polyketide chemicals. As it is regarded that each chemical has unique biological role in stress responses, it is important to study the evolution of the gene to understand its role in environmental adaptation of lichen species. In the current study, we amplified and sequenced KS domains of PKS genes from thirty two samples, which belonged to ten Cladonia species, collected from King George Island, Chile, and Svalbard. 2011-01-01T00:00:00Z