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Cellulose/carrageenan/TiO2 Nanocomposite for Adsorption and Photodegradation of Cationic Dye
조소연,오유진,박새롬,간은성,이상현 한국생물공학회 2017 Biotechnology and Bioprocess Engineering Vol.22 No.6
Cellulose/carrageenan/TiO2 nanocomposites were simply prepared by the co-dissolution of cellulose and carrageenan, and the dispersion of TiO2 in 1-ethyl-3- methylimidazolium acetate, followed by reconstitution with anti-solvents. The cellulose/carrageenan/TiO2 composite showed a much higher adsorption capacity for methylene blue (MB) than the cellulose and cellulose/TiO2 composite. The cellulose/carrageenan/TiO2 composite also degraded MB more efficiently in aqueous solution than the cellulose/ TiO2 composite. The MB adsorption capacity of the cellulose/carrageenan/TiO2 composite increased linearly with increasing carrageenan content in the composites.
조소연,명현호,정연숙 국립중앙과학관 2020 Journal of Asia-Pacific Biodiversity Vol.13 No.4
A considerable area of plantation existed in the Korean national parks. Issues such as heterogeneity withthe surrounding environment and susceptibility to disturbances have been raised. Therefore, Park Serviceimplemented a large-scale thinning practice with 15 parks and monitored the effects for five years. Wemeta-analyzed the five-year report of six parks and evaluated the effects on the biodiversity of herbaceousstratum. Repeated measures ANOVA showed that the number of plant species increased significantlyover time particularly from the fourth year. It differed significantly among thinning intensities andparks. In heavy thinning ( 60%), it was twice higher than reference after one year, and the differencebecame larger over time. The coverage of the herbaceous stratum tended to be higher; however, it wasnot significantly different. Especially, after 5 years, both the number of species and coverage were higherthan the reference in all thinning treatments. The proportion of short-lived species was significantlyhigher after one year in heavy thinning but was not significant after 5 years. Overall, this thinningpractice increased biodiversity in plantations without letting proliferation of alien or disturbing species. Thus, thinning practice was successful that led to species composition similar to that of the naturalforests.
조소연,김영진,정연숙 한국생태학회 2018 Journal of Ecology and Environment Vol.42 No.4
Background: Genus Sasa, dwarf bamboos, are considered to be species that lower biodiversity in the temperate forests of East Asia. Although they have a long interval, they, the monocarpic species, have a unique characteristic of large-scale synchronized flowering. Therefore, once they have flowered and then declined, it may be an opportunity for suppressed surrounding species. A previous study reported that Sasa borealis showed specialized flowering nationwide with a peak in 2015. However, this was based on data from a social network service and field survey at Mt. Jeombong. Therefore, we investigated S. borealis in the forests of five national parks in order to determine whether this rare synchronized flowering occurred nationwide, as well as its spatial distribution. Results: We found a total of 436 patches under the closed canopy of Quercus mongolica-dominated deciduous forests in the surveyed transects from the five national parks. Of these patches, 75% occupied a whole slope area, resulting in an enormous area. The patch area tended to be larger in the southern parks. Half (219 patches) of the patches flowered massively. Among them, 76% bloomed in 2015, which was consistent with the results of the previous report. The flowering rate varied from park to park with that of Mt. Seorak being the highest. The culms of the flowering patches were significantly taller (F = 93.640, p < 0.000) and thicker (F = 61.172, p < 0.000). Following the event, the culms of the flowering patches declined, providing a good opportunity for the suppressed plant species. The concurrent massive flowering of the mature patches was believed to be triggered by some stress such as a spring drought. Conclusion: We confirmed that the rare synchronized flowering of S. borealis occurred with a peak in 2015 nationwide. In addition, we explored that S. borealis not only monopolized an enormous area, but also dominated the floors of the late-successional Q. mongolica-dominated deciduous forests. This presents a major problem for Korean forests. As it declined simultaneously after flowering, there are both possibilities of forest regeneration or resettlement of S. borealis by massively produced seeds.