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Phylogenomics and its Growing Impact on Algal Phylogeny and Evolution
윤환수,Adrian, Reyes-Prieto,Yoon, Hwan-Su,Bhattacharya, Debashish 한국조류학회(藻類) 2006 ALGAE Vol.21 No.1
Genomic data is accumulating in public database at an unprecedented rate. Although presently dominated by the sequences of metazoan, plant, parasitic, and picoeukaryotic taxa, both expressed sequence tag (EST) and complete genomes of free-living algae are also slowly appearing. This wealth of information offers the opportunity to clarify many long-standing issues in algal and plant evolution such as the contribution of the plastid endosymbiont to nuclear genome evolution using the tools of comparative genomics and multi-gene phylogenetics. A particularly powerful approach for the automated analysis of genome data from multiple taxa is termed phylogenomics. Phylogenomics is the convergence of genomics science (the study of the function and structure of genes and genomes) and molecular phylogenetics (the study of the hierarchical evolutionary relationships among organisms, their genes and genomes). The use of phylogenetics to drive comparative genome analyses has facilitated the reconstruction of the evolutionary history of genes, gene families, and organisms. Here we survey the available genome data, introduce phylogenomic pipelines, and review some initial results of phylogenomic analyses of algal genome data.
이준모,윤환수 한국조류학회I 2021 수생생물 Vol.1 No.1
Rhodoliths are calcareous nodules, composed of non-geniculate coralline red algae with tight association of diverse microbial eukaryotes, prokaryotes, and viruses. Rhodolith beds are generally distributed in coastal benthic environments and play crucial biogeochemical and ecological roles in marine benthic ecosystems. To better understand microbial interactions in rhodolith holobionts, we newly generated and analyzed metagenome sequencing data of a rhodolith. The presence of nitrogen cycling-related protein-coding genes from the strict anaerobic community (i.e., deltaproteobacteria) suggest that the rhodolith holobiont contains an anaerobic zone. In addition, we found both aerobic and anaerobic denitrification metabolisms that may play an important role for re-cycling of nitrogen metabolism within the holobiont. Therefore, it could be advantageous to the rhodolith holobiont to directly utilize recycled carbon and nitrogen. As a self-sustaining reservoir, rhodoltihs provide favorable habitats for diverse marine organisms.
한국산 은방울꽃 ( Convallaria majalis ) 의 형태적 특징과 핵형분석
부성민(Min Boo Sung),윤환수(Hwan Su Yoon),민병미(Byeong Mee Min),방재욱(Jae Wook Bang) 한국환경생물학회 1999 환경생물 : 환경생물학회지 Vol.17 No.3
Morphology and karyotype of Korean Convallaria majalis plants were observed for taxonomic studies. Most plants produced two leaves(70%) and some one leaf(30%), but rarely three leaves. Plant length averaged 34.4±4.6㎝. Percentage of plants bearing flowers was very low with 3.7% (n=1.346) in the field. Raceme usually grew below leaves and rarely grew over leaves. Plant beared five to ten flowers on a single raceme. Chromosomes were x=19 and diploidy with 2n=38. The chromosomes were composed of 13 pairs of median and 6 pairs of submedian chromosomes. The number of chromosome and karyotype of Korean C. majalis plant agree with those of Japanese and European plants. [Convallaria majalis, chromosome, karyotype, morphological variation, taxonomy].
양은찬,John A. West,Joe Scott,윤환수,Akiko Yokoyama,Ulf Karsten,Susan Loiseaux de Goër,Evguenia Orlova 한국조류학회I 2011 ALGAE Vol.26 No.2
The unicellular marine red alga Erythrolobus australicus sp. nov. (Porphyridiophyceae) was isolated into laboratory culture from mangroves in Queensland and New South Wales, Australia. The single multi-lobed red to rose-red plastid has more than one pyrenoid and lacks a peripheral thylakoid. Arrays of small electron dense globules occur along the thylakoids. The nucleus is peripheral with a central to eccentric nucleolus. Each Golgi body is associated with a mitochondrion. The spherical cells are positively phototactic with slow gliding movement. The psaA + psbA phylogeny clearly showed that E. australicus is a distinct species, which is closely related to E. coxiae. The chemotaxonomically relevant and most abundant low molecular weight carbohydrate in E. australicus is floridoside with concentrations between 209and 231 μmol g^(-1) dry weight. Traces of digeneaside were also detected. These various approaches help to understand the taxonomic diversity of unicellular red algae.
Gayle I. Hansen,John A. West,윤환수,Christopher D. Goodman,Susan Loiseaux de Goër,Giuseppe C. Zuccarello 한국조류학회I 2019 ALGAE Vol.34 No.2
A new encrusting red alga was found growing abundantly on glass debris items that drifted ashore along the coasts ofOregon and Washington. These included discarded fluorescent tubes, incandescent light bulbs, capped liquor bottles,and ball-shaped fishing-net floats. Field collections and unialgal cultures of the alga revealed that it consisted of twomorphological phases: a young loosely aggregated turf and a mature consolidated mucilaginous crust. The turf phaseconsisted of a basal layer of globose cells that produced erect, rarely branched, uniseriate to multiseriate filaments up to500 μm long with closely spaced cells lacking pit-plugs. These filaments expanded in size from their bases to their tipsand released single cells as spores. At maturity, a second phase of growth occurred that produced a consolidated crust,up to 370 μm thick. It consisted of a basal layer of small, tightly appressed ellipsoidal-to-elongate cells that generateda mucilaginous perithallial matrix containing a second type of filament with irregularly spaced cells often undergoingbinary division. At the matrix surface, the original filaments continued to grow and release spores but often also eroded. Individual cells, examined using confocal microscopy and SYBR Green staining, were found to contain a central nucleus,a single highly lobed peripheral chloroplast without a pyrenoid, and numerous chloroplast nucleoids. Morphologicaldata from field and culture isolates and molecular data (rbcL, psbA, and SSU) show that this alga is a new genus and specieswhich we name Viator vitreocola, “a traveller on glass.”
A novice’s guide to analyzing NGS-derived organelle and metagenome data
송해중,이준모,Louis Graf,노미나,Huan Qiu,Debashish Bhattacharya,윤환수 한국조류학회I 2016 ALGAE Vol.31 No.2
Next generation sequencing (NGS) technologies have revolutionized many areas of biological research due to thesharp reduction in costs that has led to the generation of massive amounts of sequence information. Analysis of large genomedata sets is however still a challenging task because it often requires significant computer resources andknowledge of bioinformatics. Here, we provide a guide for an uninitiated who wish to analyze high-throughput NGSdata. We focus specifically on the analysis of organelle genome and metagenome data and describe the currentbioinformatic pipelines suited for this purpose.
Joe Scott,Eun Chan Yang,John A. West,Akiko Yokoyama,Hee Jeong Kim,Susan Loiseaux de Goër,Charles J. O’Kelly,Evguenia Orlova,김수연,Jeong Kwang Park,윤환수 한국조류학회I 2011 ALGAE Vol.26 No.4
The marine unicellular red algal genus Rhodella was established in 1970 by L. V. Evans with a single species R. maculata based on nuclear projections into the pyrenoid. Porphyridium violaceum was described by P. Kornmann in 1965 and transferred to Rhodella by W. Wehrmeyer in 1971 based on plastid features and the non-parietal position of the nucleus. Molecular and fine structural evidences have now revealed that Rhodella maculata and R. violacea are one species, so R. violacea has nomenclatural priority and the correct name is Rhodella violacea (Kornmann) Wehrmeyer. The status of families within Rhodellophyceae was examined. The order Dixoniellales and family Dixoniellaceae are emended to include only Dixoniella and Neorhodella. The order Rhodellales and family Rhodellaceae are emended to include Rhodella and Corynoplastis. Glaucosphaera vacuolata Korshikov and the Glaucosphaeraceae Skuja (1954) with an emended description are transferred to the Glaucosphaerales ord. nov.
柳煥琇,尹?台 全南大學校 師範大學 科學敎育硏究所 1984 科學敎育硏究誌 Vol.9 No.1
The Seongji ore deposits is a fissure filled with copper veins emplaced in ]indong formation, Goseong formation, and andesitic rocks, Cretaceous period. The major ore minerals in this ore deposits are arsenopyrite, pyrite, sphalerite, chalcopyrite, galena, specularite and electrum. The homogenization temperature of fluid inclusion in the quartz ranges from 278℃ to 350℃(十). The salinity of fluid inclusion in the quartz ranges from 6.2wt. % to 11.6wt. % equivalent NaCl.