• 식물분류학회지
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• 제52권4호
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• pp.219-225
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• 2022

To elucidate the ancestry of the allopolyploids E. stevenii and E. boöphthona, I examined eleven isozyme loci and 24 morphological characters from 28 populations representing five related Euphorbia species from Australia. According to an analysis of genetic and morphological data, three diploid species differentiated recently, but two independent polyploid species are estimated to have differentiated a relatively long time ago. Fixed heterozygosity for most isozymes in E. stevenii and E. boöphthona strongly suggests that these two species are allopolyploids rather than autopolyploids. The isozyme profiles of E. stevenii indicate that it is an allopolyploid that evolved from interspecific hybridization between the diploid E. tannensis and unidentified or extinct tetraploid species. In addition, isozyme patterns strongly suggest that E. stevenii was one of the ancestors of E. boöphthona. However, E. boöphthona showed a large number of fixed alleles that were not detected in any other Australian Eremophyton species. The most likely hypothesis for the origin of E. boöphthona is that it was formed by hybridization and chromosomal doubling between an extinct diploid species and the hexaploid E. stevenii.

• 한국균학회지
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• 제20권4호
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• pp.281-284
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• 1992

Two interesting new hyphomycetes collected on rachis of an unidentified palm (Palmao) from Malayasia are described and their taxonomy is discussed in this paper. One of them is unique in producing basauxic conidiophores from conidiophore mother cells that are sessile, simple, cylindrical or cupulate, and solitary, gangliar, acrogenous, dry phragmoconidia. It is classified in a new genus Basauxia, as a new species, B. pulchra. The other hyphomycete is also unique in producing characteristic solitary, eight-celled, eight-armed gangliar conidia on simple conidiophores. A new genus, Ashtaangam is proposed for it in which it is placed as a new species, A. sundaram.

• Journal of Plant Biology
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• 제36권1호
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• pp.9-17
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• 1993

Seven dictyostelid cellular slime molds isolated from the forest soils of Mt. Halla were described and illustrated. Dictyostelium flavidum Hong et Chang and three unidentified Dictyostelium, HL-2, HL-3 and CJ-9 were compared and discussed. All the isolates were cultivated on low nutrient media, 0.1- L-P(pH6) with Escherichia coli at 20-22$^{\circ}C$. Seven unrecorded species were all polar granule (PG) negative. These were Dictyostelium crassicaule Hagiwara, D. sphaerocephalum (Oud.) Sacc. et March, D. macrocephalum Hagiwara, Yeh et Chien, D. capitatum Hagiwara, D. brefeldianum Hagiwara, D. aureum var. aureum Cavender, Worley and Raper, and D. giganteum Singh.

• 한국환경과학회지
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• 제29권5호
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• pp.495-506
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• 2020

This study investigated the nitrate formation process, and mass closure of Particulate Matter (PM) were calculated over the urbanized area of Jeju Island. The data for eight water-soluble inorganic ions and nineteen elements in PM_2.5 and PM₁₀ were used. The results show that the nitrate concentration increased as excess ammonium increased in ammonium-rich samples. Furthermore, nitrate formation was not as important in ammonium-poor samples as it was in previous studies. According to the sum of the measured species, approximately 45~53% of gravimetric mass of PM remained unidentified. To calculate the mass closure for both PM_2.5 and PM₁₀, PM chemical components were categorized into secondary inorganic aerosol, crustal matter, sea salt, trace matter and unidentified matter. The results by the mass reconstruction of PM components show that the portion of unidentified matter was decreased from 52.7% to 44.0% in PM_2.5 and from 45.1% to 29.1% in PM₁₀, despite the exclusion of organic matter and elemental carbon.

• The Korean Journal of Ecology
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• 제21권5_2호
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• pp.557-565
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• 1998

The occurrence and distribution of dictyostelid cellualr slime molds were investigated in forests of Mt. Paektu. Fourteen species were isolated from forest soils of thirteen sites as follows Dictyostelium minutum, D. brefeldianum, D. crassicaule, D. capitatum, D. mucoroides var. stoloniferum, D. macrocephalum, D. mucoroides, D. septentrionalis, D. purpureum, D. aureo-stipes, P. violaceum, P. pallidum and two unidentified speceis. Mean total clones and species found were 4,415.69 No./g and 2.92, respectively. Dominant species were D. minutum, D. brefeldianum and D. crassicaule in this study area, and first widespread species was D. minutum. All sepecies that found in Mt. Paektu were isolated from forests of South Korea. But dominant species was different from those of South Korea. Total clones and species were more in subalpine Eurya japonica than in low elevated abies nephrolepis. It was thought that distribution of dictyostelids was related to soil microenvironments by vegetation, not or not more elevation.

• 한국미생물·생명공학회지
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• 제49권3호
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• pp.384-390
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• 2021

A Gram-negative, aerobic, motile by gliding, and rod-shaped marine bacterium, designated CE67^T was isolated from the marine sponge Callyspongia elegans on Biyang-do in Jeju Island. The CE67^T strain grew optimally at 25℃, pH 7.5, and in the presence of 2-3% (w/v) NaCl. Phylogenetic analysis based on 16S rRNA gene sequence showed that strain CE67^T was related to the genus Aureivirga and had the highest 16S rRNA gene sequence similarity to the Aureivirga marina VIII.04^T type strain (96.3%). The primary fatty acids (>10%) of strain CE67^T were iso-C_15:0 (35.3%) and iso-C_17:0 3OH (21.8%). The polar lipid profile of strain CE67^T contained phosphatidylethanolamine, unidentified aminolipids, and unidentified lipids. The predominant menaquinone was MK-6. The DNA G+C content was 29.1 mol%. Based on the polyphasic taxonomic analysis, strain CE67^T was determined to be a representative novel species of the genus Aureivirga for which we propose the name Aureivirga callyspongiae sp. nov., whose strain type is CE67^T (=KCTC 42847^T=JCM 34566^T).

• 대한임상검사과학회지
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• 제48권1호
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• pp.15-21
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• 2016

Aspergillus는 가장 흔하게 감염을 일으키는 기회 감염균이다. 검사실에서 Aspergillus의 동정은 대부분 형태학적으로 이루어진다. 최근에는 형태학적으로 동정이 안 되거나, 속 수준까지만 동정이 되는 까다로운 균들 동정하기 위하여 분자유전학적인 방법들이 제안되고 있다. 임상검체에서 분리한 475건의 Aspergillus는 Aspergillus fumigatus 257주(54.1%), A. niger 101주(21.3%), A. flavus 43주(9.1%), A. terreus 29주(6.1%), Aspergillus nidulans 2주(0.4%), 그리고 Aspergillus clavatus 1주(0.2%), 그리고 Aspergillus species는 42주(8.8%)이었다. 미동정 균주와 종 구분을 위한 11건의 염기서열분석에서는 Aspergillus fumigatus 5주, Aspergillus falvus 1주, Aspergillus terreus 1주, Aspergillus lentulus 1주 동정되었다. Aspergillus versicolor 2주, 그리고 1주는 Emericella parvathecia로 동정되었다. Aspergillus의 92.2%는 형태학적으로 동정이 가능하였고, 8.8%는 종 수준의 동정이 불가능하였다. 종 수준의 동정을 하기 위해서는 ITS와 D1D2를 이용한 염기서열분석이 유용한 것으로 사료된다.

• Journal of Ecology and Environment
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• 제36권4호
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• pp.371-390
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• 2013

Remarkable diversity of diatom taxa occurs in intertidal sand-flats of the Nakdong River estuary, one of the most dynamic and productive ecosystem in Korea. Benthic diatoms were collected from the sandy sediments to clarify the taxonomic accounts and distribution of the old genus Navicula, i.e., the naviculoid flora. Total 92 taxa belonging to Navicula sensu stricto and 22 genera separated from Navicula sensu lato are reported with brief descriptions and micrographs, and many species remain unidentified. The genera are ranked by the number of diatom species: Navicula of 33 species and varieties, Fallacia of 17 species, Placoneis of five species, Fogedia and Parlibellus of four species, Austariella, Hippodonta and Petroneis of three species, Cosmioneis, Diadesmis, Luticola, Moreneis and Sellaphora of two species and variety, Berkeleya, Chamaepinnularia, Cocconeiopsis, Diademoides, Dickieia, Eolimna, Geissleria, Haslea, Lyrella and Mayamaea of one species. Through 32 samplings of the 12 areas, the important species were identified Navicula perminuta, N. gregaria, N. torneensis, Fallacia cunoniae, F. litoricola, F. subforcipata, F. tenera. The naviculoid diatoms constitute an average of 27% (range: minimum to maximum, 5-75%), of the benthic diatom assemblages. The diatom assemblages are characterized by the colonizing of a few dominant or frequent species and many occasional or rare species. The dominant species were observed to fluctuate with sampling site and time. Among the reported naviculoid diatoms, 46 taxa are newly reported in Korea.

• 한국수산과학회지
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• 제32권3호
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• pp.295-302
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• 1999

여수주변해역에서 부유성 어란과 치자어의 분포 조사가 1996년 8월, 11월과 1997년 1월, 4월에 실시되었으며 조사기간 중 어란은 4종, 치자어는 24종이 동정되었다. 어란은 멸치 (Engraulis japonicus)가 전체 어란 출현량의 $80.6\%$로 가장 높았고, 다음은 동갈양태류 (Callionymidae spp.) ($1.6\%$), 그리고 전어 (Konosirus punctatus)와 앨퉁이 (Maurolicus muelleri)는 $1.0\%$ 미만으로 출현량 비율이 매우 낮았으며 기타 미동정 어란은 $17.8\%$를 차지하였다. 치자어의 출현 종 수는 여름철에 17종으로 가장 많았고, 봄철에 4종으로 가장 적었다. 어종별 출현비율은 동갈양태류가 전체 치자어 출현량의 $25.7\%$로 가장 높았고 망둥어류 (Gobiidae spp.)가 $23.5\%$, 청보리멸 (Sillago japonica)이 $17.2\%$, 멸치가 $12.2\%$, 앞동갈베도라치 (Omobranchus elegans )가 $9.9\%$를 차지하였으며 그 외의 종은 모두 $2.0\%$ 미만이었다. 여수주변해역의 치자어는 망둥어류, 동갈양태류, 쥐노래미등의 연안성 어종과 비록 출현량은 작지만 제주도 주변해역을 통과하는 난류수의 영향으로 출현한 몽치다래류, 만새기, 자리돔 등과 같은 난류성종으로 구성되어 있었다.

• Journal of Microbiology and Biotechnology
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• 제12권3호
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• pp.497-502
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• 2002

Thirty-nine strains of Leuconostocs found to be tolerant to $10\%$ or more garlic were selected for further identification, by comparing their whole-cell protein pattern, 16S rRNA gene (first 530 bases) sequence, cellular fatty acid composition, and carbon source metabolism. Two isolates were Identified as Leuconostoc mesenteroides and 32 others as Leuconostoc citreum. Five other strains belonging to a cluster could not be allocated to the existing species. 16S rRNA gene sequence and cellular fatty acid composition of the unidentified bacteria exhibited close similarity with Leuconostoc argentinum. The unidentified isolates were not allocated to L. argentinum, because they formed polysaccharide from sucrose, while L. argentinum strains do not. Leuconostocs tolerant to high concentration of garlic were found predominantly on garlic surface, an extreme environment which is unfit for most of other microorganisms.