• 제목/요약/키워드: Biological Sciences

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First Report of Albifimbria verrucaria and Deconica coprophila (Syn: Psylocybe coprophila) from Field Soil in Korea

  • Gurung, Sun Kumar;Adhikari, Mahesh;Kim, Sang Woo;Lee, Hyun Goo;Jun, Ju Han;Gwon, Byeong Heon;Lee, Hyang Burm;Lee, Youn Su
    • 한국균학회지
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    • 제47권3호
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    • pp.209-218
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    • 2019
  • During a survey of fungal diversity in Korea, two fungal strains, KNU17-1 and KNU17-199, were isolated from paddy field soil in Yangpyeong and Sancheong, respectively, in Korea. These fungal isolates were analyzed based on their morphological characteristics and the molecular phylogenetic analysis of the internal transcribed spacer (ITS) rDNA sequences. On the basis of their morphology and phylogeny, KNU17-1 and KNU17-199 isolates were identified as Albifimbria verrucaria and Deconica coprophila, respectively. To the best of our knowledge, A. verrucaria and D. coprophila have not yet been reported in Korea. Thus, this is the first report of these species in Korea.

Aspergillus caninus (Syn: Phialosimplex caninus): a New Isolate from Field Soils in Korea

  • Adhikari, Mahesh;Gurung, Sun Kumar;Kim, Sang Woo;Lee, Hyun Goo;Ju, Han Jun;Gwon, Byeong Heon;Kosol, San;Bazie, Setu;Lee, Hyang Burm;Lee, Youn Su
    • 한국균학회지
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    • 제46권4호
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    • pp.383-392
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    • 2018
  • During the study of indigenous fungal communities in soil samples collected from various field soils in Sancheong, Gyeongsangnam-do, Korea in 2017, several species of Aspergillus were discovered. Aspergillus caninus (KNU17-7) was isolated, identified, and described based on the results from macro and micro morphological characteristics and molecular characterization. Morphologically, it was identified using five different growth media: potato dextrose agar, oatmeal agar, yeast extract sucrose agar, czapek yeast extract agar, and malt extract agar. For the molecular identification, sequencing of internal transcribed spacer, ${\beta}-tubulin$, and calmodulin genes was performed. Based on this characterization, our study isolate was identified as Aspergillus caninus. This fungal species has not been officially reported in Korea before, and we report here with its morphological and molecular phylogenetic characterization.

Characterization of Newly Recorded Talaromyces veerkampii Isolated from Field Soil in Korea based on Morphology and Multigene Sequence Analysis

  • Mahesh Adhikari;Hyun Seung Kim;Hyo Bin Park;Ki Young Kim;In Kyu Lee;Eun Jeong Byeon;Ji Min Woo;Hyang Burm Lee;Youn Su Lee
    • 한국균학회지
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    • 제50권4호
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    • pp.347-355
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    • 2022
  • A fungal isolate belonging to the phylum Ascomycota was isolated and identified as Talaromyces veerkampii in 2017 during a survey of fungal diversity in field soils in Korea. This fungal isolate was identified and described based on macro- and micromorphological and molecular characterization. The identification was also based on partial 18S-ITS1-5.8S-ITS2-28S rDNA and calmodulin (CaM)-encoding gene sequencing data. Talaromyces veerkampii has not been previously reported in Korea. Thus, we report here a newly discovered species from soil in Korea along with its morphological and molecular characteristics.

Munc18 Plays an Important Role in the Regulation of Glutamate Release during Female Puberty Onset

  • Kim, Byung U.;Choi, Jungil;Ahn, Kook Hee;Jeong, Jin Kwon;Ha, Chang Man;Jeong, Choon Soo;Lee, Chae Kwan;Kang, Sung Goo;Lee, Byung Ju
    • Molecules and Cells
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    • 제22권1호
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    • pp.30-35
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    • 2006
  • Munc18, a mammalian homolog of C. elegans Unc, is essential for neurotransmitter release. The aim of this study was to identify estrogen-dependent expression of Munc18-1 and its role in the regulation of glutamate release for puberty onset. Hypothalamic munc18-1 mRNA levels were significantly increased by estrogen treatment in ovariectomized, immature female rats. During pubertal development, the munc18-1 mRNA levels dramatically increased between the juvenile period and the anestrous phase of puberty. Intracerebroventricular administration of an antisense oligodeoxynucleotide against munc18-1 mRNA significantly decreased glutamate release and delayed the day of puberty onset. These results suggest that Munc18-1, expressed in an estrogen-dependent manner, plays an important role in the onset of female puberty via the regulation of glutamate release.

Cloning and Expression of a Paenibacillus sp. Neopullulanase Gene in Saccharomyces cerevisiae Producing Schwanniomyces occidentalis Glucoamylase

  • Kim, Hyo-Jeong;Park, Jeong-Nam;Kim, Hee-Ok;Shin, Dong-Jun;Chin, Jong-Eon;Blaise Lee, Hwang-Hee;Chun, Soon-Bai;Bai, Suk
    • Journal of Microbiology and Biotechnology
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    • 제12권2호
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    • pp.340-344
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    • 2002
  • A gene, npl, encoding neopullulanase from Paenibacillus sp. KCTC 8848P was cloned and expressed in Escherichia coli. It consisted of an open reading frame of 1,530 bp for a protein that consisted of 510 amino acids with a molecular weight of 58,075 Da. The deduced amino acid sequence of the neopullulanase gene had $92\%$ identity with the neopullulanase of Bacillus polymyxa. The npl gene was also expressed in Saccharomyces cerevisiae secreting Schwanniomyces occidentalis glucoamylase (GAM1) under the control of the yeast actin gene (ACT1) promoter. Secretion of the neopullulanase was directed by the yeast mating pheromone ${\alpha}$ -factor ($MF{\alpha}1$) prepro region. Enzyme assays confirmed that co-expression of npl and GAM1 enhanced starch and pullulan degradation by S. cerevisiae.

Quantification of the galactose-operon mRNAs 5 bases different in their 5'-ends

  • Ji, Sang-Chun;Wang, Xun;Jeon, Heung-Jin;Yun, Sang-Hoon;Lee, Hee-Jung;Lim, Heon-M.
    • BMB Reports
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    • 제43권7호
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    • pp.474-479
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    • 2010
  • Three assay methods for quantification of the two galactose-operon mRNAs that only differ by 5 bases in their 5'-end are presented. The 5' ends of each mRNA were extended by ligating the 3'-end of the abundant 5S rRNA. This ligation extends the 5' ends of the two gal mRNAs long enough to be distinguished by the specific PCR primers in the following quantification reactions. Quantification of the corresponding cDNAs was performed either by primer extension assay or real-time qPCR. To circumvent the problem of the RNA ligation reaction (i.e. very low ligation efficiency), we devised a new method that employs real-time qPCR directly for the quantification of the gal transcripts which differ by 5 bases in their 5'-ends.