• Proceedings of the Microbiological Society of Korea Conference
• /
• 2005.05a
• /
• pp.190.2-190
• /
• 2005

• Journal of Species Research
• /
• v.6 no.1
• /
• pp.51-58
• /
• 2017

Wangsania, a new genus of Apiaceae from limestone areas and typified by W. insolens (Kitagawa) B.Y. Lee & J.O. Hyun, is described from Gangwon-do, Korea. Wangsania insolens was initially treated as Peucedanum insolens Kitagawa due to similarity with Peucedaunm cervaria, but it differs markedly in its unique morphological characters, such as rarely branched roots and a single basal leaf with 3 or -4 ternately dissected leaflets. These characters apparently represent apomorphies for Wangsania. The parsimony analysis of nuclaer ribosomal DNA ITS sequences revealed Wangsania to be not closely related to either Peucedanum or to any of 14 different tribes or clades within subfamily Apioideae.

• Journal of Species Research
• /
• v.7 no.1
• /
• pp.60-72
• /
• 2018

Our study aimed to discover indigenous prokaryotic species in Korea. A total of 29 bacterial species in the phylum Proteobacteria were isolated from freshwater and sediment of rivers and brackish zones in Korea. From the high 16S rRNA gene sequence similarity (${\geq}98.8%$) and formation of a robust phylogenetic clade with the closest species, it was determined that each strain belonged to an independent and predefined bacterial species. To our knowledge, there is no official report or publication that has previously described these 29 species in Korea. Specifically, we identified 10, 12, and seven species of eight, 12, and seven genera that belong to classes Alphaproteobacteria, Betaproteobacteria, and Gammaproteobacteria, respectively; all are reported as previously unrecorded bacterial species in Korea. The Gram reaction, colony and cell morphology, basic biochemical characteristics, isolation source, and strain IDs for each are also described.

• Journal of Species Research
• /
• v.7 no.3
• /
• pp.187-192
• /
• 2018

During a comprehensive study of indigenous prokaryotic species in South Korea, nine bacterial species in the phylum Bacteroidetes were isolated from freshwater environmental samples that were collected from three major rivers in the Republic of Korea. High 16S rRNA gene sequence similarity (${\geq}98.7%$) and robust phylogenetic clades with the closely related species suggest that each strain was correctly assigned to an independent and predefined bacterial species. There were no previous reports of these nine species in Korea. Within the phylum Bacteroidetes, four species were assigned to the genus Flavobacterium, order Flavobacteriales, and five species to three genera of two families in the order Cytophagales. Gram reaction, colony and cell morphology, basic biochemical characteristics, isolation source, and strain IDs are described in the species description section.

• Proceedings of the Korean Society for Food Science of Animal Resources Conference
• /
• 2006.05a
• /
• pp.246-249
• /
• 2006

• Proceedings of the Plant Resources Society of Korea Conference
• /
• 2002.04a
• /
• pp.31-32
• /
• 2002

• Proceedings of the Korean Society of Plant Pathology Conference
• /
• 2005.04a
• /
• pp.65.2-66
• /
• 2005

• Proceedings of the Korean Society of Plant Pathology Conference
• /
• 2005.04a
• /
• pp.68.2-68.2
• /
• 2005

• Microbiology and Biotechnology Letters
• /
• v.47 no.2
• /
• pp.195-200
• /
• 2019

The purpose of this study was to investigate the melanogenesis inhibiting activity of the ethanol extract from Polygonum amphibium L. Firstly, the n-hexane (Hx), chloroform ($CHCl_3$), ethyl acetate (EA), n-butanol (BuOH), and water (Water) fractions were isolated from the P. amphibium L. ethanol extract. The efficacy of melanogenesis was found to significantly decrease via the EA and BuOH fractions when compared to the control in B16F10 cells. EA particularly showed the lowest melanin content in B16F10 cells when compared to all the other extracts. Concentration-dependent inhibition of melanin synthesis was also observed in the EA fraction at concentrations below $50{\mu}g/ml$, which did not exhibit cytotoxicity in B16F10 cells. Notably, the expression of three key proteins (tyrosinase, tyrosinase-related protein-1 (TRP-1), and TRP-2), which are involved in melanogenesis, were significantly decreased via the EA fraction. EA also inhibited body pigmentation in vivo in a zebrafish model. Overall, we demonstrated melanogenesis suppression using the EA fraction from P. amphibium L., which could be a potential candidate for an antimelanogenesis agent.

• Journal of Species Research
• /
• v.10 no.3
• /
• pp.246-254
• /
• 2021

Subalpine and alpine ecosystems are especially vulnerable to temperature increases. Betula ermanii Cham. (Betulaceae) is a dominant broad-leaved tree species in the subalpine zone and is designated as a 'Climate-sensitive Biological Indicator Species' in South Korea. This study aimed to predict the potential distribution of B. ermanii under current and future climate conditions in South Korea using the MaxEnt model. The species distribution models showed an excellent fit (AUC=0.99). Among the climatic variables, the most critical factors shaping B. ermanii distribution were identified as the maximum temperature of warmest month (Bio5; 64.8%) and annual mean temperature (Bio1; 20.3%). Current potential habitats were predicted in the Baekdudaegan mountain range and Mt. Hallasan, and the area of suitable habitat was 1531.52 km², covering 1.57% of the Korean Peninsula. With global warming, future climate scenarios have predicted a decrease in the suitable habitats for B. ermanii. Under RCP8.5-2070s, in particular, habitat with high potential was predicted only in several small areas in Gangwon-do, and the total area suitable for the species decreased by up to 97.3% compared to the current range. We conclude that the dominant factor affecting the distribution of B. ermanii is temperature and that future temperature rises will increase the vulnerability of this species.