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김재근,신차정,남종민 한국생태학회 2013 Journal of Ecology and Environment Vol.36 No.1
Cicuta virosa is an endangered species in Korea, which is a southern marginal area. To conserve and restore habitats of this plant, we investigated water and soil environmental characteristics and vegetation at four habitats during the growing season. The C. virosa habitats differed in community structure, water and substrate properties, and water regime. Although the total distribution ranges of the water and soil environments for C. virosa were wide and overlapped with the optimal environmental range of distribution of accompanying species, the optimal water level range for C. virosa was defined as 7 ± 3.5 cm. Water level was adjusted by substrate structure such as a mound of P. japonica and a floating mat comprised of accompanying species. A floating mat was an aid to maintain an optimal and stable water level in deep or fluctuating water and to prevent strong competition with prolific macrophytes. The GS sampling site, which had floating mats, could be a good model for C. virosa conservation in a warm temperate region, whereas the PC sampling sites, which experienced a water shortage in spring, provided a clue about the decline in C. virosa population size.
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Assessment of genetic diversity and distance of three Cicuta virosa populations in South Korea
남보은,김재근,신차정 한국생태학회 2013 Journal of Ecology and Environment Vol.36 No.3
Cicuta virosa L. (Apiaceae) is a perennial emergent plant designated as an endangered species in South Korea. According to the former records, only four natural habitats remain in South Korea. A former study suggested that three of four populations (Pyeongchang: PC, Hoengseong: HS, Gunsan: GS) would be classified as different ecotypes based on their different morphological characteristics and life cycle under different environmental conditions. To evaluate this suggestion, we estimated genetic diversity in each population and distance among three populations by random amplification of polymorphic DNA. Seven random primers generated a total of 61 different banding positions, 36 (59%) of them were polymorphic. Nei’s gene diversity and the Shannon diversity index increased in the order of PC < HS < GS, which is the same order of population size. In the two-dimensional (2D) plot of first two principal components in principal component analysis with the presence of 61 loci, individuals could be grouped as three populations easily (proportion of variance = 0.6125). Nei’s genetic distance for the three populations showed the same tendency with the geographical distance within three populations. And it is also similar to the result of discriminant analysis with the morphological or life-cycle factors from the previous study. From the results, we concluded that three different populations of C. virosa should be classified as ecotypes based on not only morphology and phenology but genetic differences in terms of diversity and distance as well.
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Van Khanh Nguyen,최원영,하연주,구여진,이찬희,박재현,장건우,신차정,조순자 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.78 No.-
Two highly tellurite-resistant bacteria were isolated from wastewater. Both bacteria could performtellurite reduction under an initial pH of 5–9, temperature of 20–37 C, and salinity conditions lower than5%. The maximum reduction rate of strain WYA (Vmax = 20.45 mMh 1) was much higher than that of strainWYS (Vmax = 11.49 mMh 1). Both bacteria produced tellurium nanorods that were accumulatedintracellularly or extracellularly. Strain WYA is a new strain belonging to the Raoultella genus, whereasstrain WYS belongs to the Escherichia genus. This study indicated that both these bacteria are potentialmicroorganisms for green synthesis of tellurium nanorods, which have a wide application inenvironmental remediation and the nanotechnology industry.
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