순천만 유입 수계의 수질 조사

허재선,심후진,전해숙 順天大學校 1999 論文集 Vol.18 No.1

Monthly survey on water quality of the branch streams of Sunchon Bay was carried out for the last 1 year (1998 to 1999) as a part of long term projects to conserve Sunchon Bay - a very important wetland supporting a well developed framework of biodiversity including several bird species threatened with extinction. Three points of Dongchon, main stram of Sunchon Bay, and five points of the branch streams - Seochon, Hyanglimchon, Okchon and Isachon were selected for the survey. The results of the water quality measurement are the followings; 1) According to the standard of river water quality amended by Korean ministry of Environment, the water quality of the branch streams of Sunchon Bay corresponded to the Second Level which is suitable for river water. 2) Monthly changes of the water quality were not variable, except that of September, 1998 during the survey. 3) Total nitrogen and phosphorus contents responsible for eutrophication were relatively lower than those measured in several rivers in Korea. However, careful regulation of nitrogen and phosphorus contents at the upper parts of Dongchon stream seems to be needed. 4) Isacnon, the largest branch stream of Sunchon Bay, was found to be less polluted and played a very important role in improving water quality by a dilution effect before the polluted and played a very important role in improving water quality by a dilution effect before the polluted water of Dongchon stream reaches Sunchon Bay. It was more likely that the water quality of Sunchon Bay was dependant on area source of pollutants emitted by agriculture and livestock farming rather than industrial effluents or residential wastewater.

상수원수의 효과적인 정수처리를 위한 최적 응집제 주입량 결정 : Ⅲ. The Effect of Coagulant Aid Dose Ⅲ. 응집보조제 주입효과

손보균,허재선,조주식 順天大學校 1999 論文集 Vol.18 No.1

This study was conducted to determine the optimum amounts of coagulant for effective treatment of raw water. To avoid overdosing coagulants in case of low turbidity of raw water, the removal rate of turbidity and particle size distribution of flocs were investigated after addition of coagulant aids such as lime and coagulated sludges. When lime was used as a coagulant aid, the maximum removal rate of turbidity was found to be 93% by addition of 20ml/ℓ of lime in combination with 35mg/l polyaluminum chloride(PAC) as a coagulant. At the settling time of 8 min, more than 82% of suspended solids showed the particle size of less than 10㎛ and -7.4mV of zeta potential. It was found that increase in lime addition enhanced the removal efficiency of turbidity, but had no effect on reduction in lime addition enhanced the removal efficiency of turbidity, but had no effect on reduction in coagulant dosage. When coagulated sludges was employed as the aid, the maximum removal rate of turbidity was found to be 82% by addition of 20mg/l of the sludges in combination with 25mg/l PAC as a coagulant. At the settling time of 8 min, about 80% of suspended solids showed the particle size of less than 10um and +3.8mV of zeta potential. Zeta potential decreased with increasing amounts of coagulated sludges and PAC. Addition of coagulated sludges increased the removal rate of turbidity in the water and, at the same time, reduced the amounts of coagulant added.

Three New Monotypic Genera of the Caloplacoid Lichens (Teloschistaceae, Lichen-Forming Ascomycetes)

( Sergii Y Kondratyuk ),( Laszlo Lokos ),( Jung A Kim ),( Anna S Kondratiuk ),( Min Hye Jeong ),( Seol Hwa Jang ),( Soon Ok Oh ),( Jae Seoun Hur ) 한국균학회 2015 Mycobiology Vol.43 No.3

Three monophyletic branches are strongly supported in a phylogenetic analysis of the Teloschistaceae based on combined data sets of internal transcribed spacer and large subunit nrDNA and 12S small subunit mtDNA sequences. These are described as new monotypic genera: Jasonhuria S. Y. Kondr., L. Lokos et S. -O. Oh, Loekoesia S. Y. Kondr., S. -O. Oh et J. -S. Hur and Olegblumia S. Y. Kondr., L. Lokos et J. -S. Hur. Three new combinations for the type species of these genera are proposed.

Isolation of Antagonistic Fungi Associated with the Lichens Distributed in Southern Parts of Korea

Jae-Seoun Hur,Geon-Seon Han,Jin Won Kim,Yin-Won Lee 한국식물병리학회 1999 Plant Pathology Journal Vol.15 No.5

Indicative Responses of Rice Plant to Atmospheric Ozone

Hur, Jae-Seoun,Kim, Pan-Gi,Yun, Sung-Chul,Park, Eun-Woo The Korean Society of Plant Pathology 2000 Plant Pathology Journal Vol.16 No.3

Differences in physiological and biochemical responses between sensitive and tolerant rice cultivars to ozone were investigated to develop reliable indications of early ozone damage. Three Korean local rice cultivars -sen-sitive cultivar Dongjin (DJ), moderately tolerant cultivar Hwayeong (HY) and tolerant cultivar Ilmee (IM) were exposed to ozone at the concentrations of 100 nl $\textrm{l}^{-1}$ or 200 nl $\textrm{l}^{-1}$ , 8 h per day for 10 days in a controlled-environment fumigation chamber. The rice cultivars seemed to be endurable to ozone stress at the concentration of 100 nl $\textrm{l}^{-1}$ which is frequently monitored during the growing season in summer. However, severe damage was induced and differential sensitivity was clearly noted among the rice cultivars at the higher ozone concentration. Activation of the glutathion (GR) -ascorbate peroxidase (APX) cycle was likely to be responsible for protection of rice plants against ozone exposure, relating difference in sensitivity of rice cultivars to ozone. Photosynthetic activity appeared to be one of sensitive responses, for which chlorophyll fluorescence and leaf greenness can together provide a very reliable index, a degree of photosynthetic damages by ozone. Formation of malondialdehyde (MDA) was also considered as an indication that can differentiate cultivars sensitivity to ozone. However, the changes in polyamines and total phenolics were not consistent with exposed ozone concentrations and/or ozone sensitivity of the cultivars. The behavior of polyamines and phenolics in the damaged plants at high ozone levels could be interpreted as an indication of ozone injury rather than activation of additional protection mechanisms scavenging active oxygen species formed by ozone. Several responses triggered by ozone could explain the differential sensitivity of the rice cultivars and be used as reliable indications of relative ozone damage to rice plant.

Recent Progress in Lichen Research in Korea - from Taxonomic Study to Environmental Application

Hur, Jae-Seoun,Kang, Eui-Sung,Kim, Minjin,Oh, Soon-Ok,Kahng, Hyung-Yeel,Kim, Hyun-Woo,Jung, Jae-Sung,Koh, Young-Jin The Korean Society of Plant Pathology 2004 Plant Pathology Journal Vol.20 No.1

Lichen is one of the most widely distributed eucaryotic organisms in the world. Lichen is the result of a symbiotic association between two unrelated organisms - a fungus and an alga (or cyanobacterium). In USA, Japan and European countries, there has been a resurgence of interest in lichens as source of novel, pharmacologically active molecules during the last 20 years. However, lichen researches in Korean lichens were mainly focused on investigation of Korean lichen flora and most of them were primitive and short-term based projects until 1990s. In this communication, general introduction of lichens was attempted to draw the attention of Korean researchers to Korean lichen bioresource. Research activities on Korean lichens during the past were also summarized. Recent progress in Korean lichen research is briefly discussed with emphasis of KoLRI (Korean Lichen Research Institute) activities and roles in national researches projects on bioresource development in Korea.

Antimicrobial Properties of Cold-Tolerant Eucalyptus Species against Phytopathogenic Fungi and Food-Borne Bacterial Pathogens

Hur, Jae-Seoun,Ahn, Sam-Young,Koh, Young-Jin,Lee, Choong-Il The Korean Society of Plant Pathology 2000 Plant Pathology Journal Vol.16 No.5

Mechanol extracts of three cold-tolerant eucalyptus trees-Eucalyptus darlympleana, E. gunnii and E. unigera were screened for antimicrobial activity against twenty two phyto-pathogenic fungi and six food-borne bacterial pathogens. E. unigera showed the antagonistic activity against all the tested pathogens. Among the tested fungal pathogens, Pythium species were highly sensitive to the leaf extracts. Especially, P. vanterpoolii, a causal agent of leaf blight in creeping bentgrass (Agrostis palustris), was completely inhibited by the extracts. The eucalyptus extracts were also effective in inhibiting the fungal growth of Botrytis cinerea and Phomopsis sp. isolated from the lesions of kiwifruit soft rot during post-harvest storage. Escherichia coli O-157 was less sensitive to the inhibition than the other bacterial pathogens tested. It was likely that Gram positive bacteria-Bacillus subtilis and Streptococcus mutans were more sensitive to the eucalyptus extracts than Gram negative bacteria-Escherichia coli, Salmonella enteritidis and Pseudomonas aeruginosa. Our findings suggest that the cold-tolerant eucalyptus species have antimicrobial properties that can serve the development of novel fungitoxic agents or food preservatives.

Isolation of Anagonistic Fungi Associated with the Lichens Distributed in Southern Parts of Korea

Hur, Jae-Seoun,Han, Geon-Seon,Kim, Jin-Won,Lee, Yin-Won The Korean Society of Plant Pathology 1999 Plant Pathology Journal Vol.15 No.5

Lichen-forming (LFF) or lichenicolous fungi (LCF) were isolated from the lichens collected at‘Backwoon’mountain area,‘Chiri’mountain area and‘Sorok’island in the southern regions of Korea and were screened for antagonistic efficacy against several phyto-pathogenic fungi. Symbiotic algae-free LFF and LCF were isolated by the following methods: I) discharged spores (ascospores), II) macerated thallus suspension and III) direct use of thallus fragments. Among 58 isolates obtained from 34 lichens, 8 isolates showed antifungal activity against Rhizoctonia solani. Antifungal activities of the strongest antagonistic isolate (LB9810) originated from the thallus of Parmelia quercina lichen were evaluated against 15 phyto-pathogenic fungi. When crude methanol extract of mycelia of the LB8910 isolate was employed at the rate of 0.5% (v/w), fungal growth of Magnaporthe grisea and Rhizoctonia solani was severly and Rhizoctonia solani was severly inhibited as much as approximately 60% compared to control. Growth of various food-borne same extract. The extract was successively partitioned with n-hexane, ethyl acetate and n-butanol. n-Hexane fraction displayed the strongest antifungal activities against R. solani. The LB9810 isolate was finally identified as Fusarium equiseti (Corda) Sacc., which has not been reported as LFF or LCF yet. Therefore, it is very likely that F. equiseti isolated it the study was originated from the contaminants associated with thallus fragments rather than from LFF or LCF.

Isolation, Cultivation, and Antifungal Activity of a Lichen-Forming Fungus

Hur, Jae-Seoun,Kim, Hye-Jin,Lim, Kwang-Mi,Koh, Young-Jin The Korean Society of Plant Pathology 2003 Plant Pathology Journal Vol.19 No.2

A lichen-forming fungus was successfully isolated by discharged spore method from Korean lichen (Hetero-dermia sp.) and cultivated in pure culture. The isolate JR0012 inhibited mycelial growth of several plant-pathogenic fungi. Mycelial growth of the four Pythium spp. tested was completely inhibited. Potato dextrose broth was found to be the medium favorable for large-scale production of antibiotics from the isolate. Anti-fungal substances produced in axenic culture were partially purified. This is the first report in Korea of lichen-forming fungus successfully isolated and which exhibited strong antifungal activity against plant-pathogenic fungi, especially the four Pythium spp..

Inhibitory Effects of Atmospheric Ozone on Magnaporthe grisea conidia

Hur, Jae-Seoun,Kim, Jung-Ah,Kim, Minjin,Koh, Young-Jin The Korean Society of Plant Pathology 2002 Plant Pathology Journal Vol.18 No.1

Direct effects of atmospheric ozone on conidia of the rice blast pathogen, Magnaporthe grisea, were investigated to evaluate ozone-induced effects on infection potential of the rice blast fungus. Acute ozone exposure (200 nl $1^{-1}$, 8 h $day^{-1}$3 days) during sporulation significantly affected conidial morphology, appressorium formation, and disease development on rice loaves. Ozone caused reduction in conidial size and change in conidial shape. Relative cytoplasmic volume of lipids and vacuoles were increased in ozone-exposed conidia. Inhibition of appressorium formation and simultaneous increase in endogenous levee of polyamines were found in ozone-exposed conidia. The inverse relationship between appressorium formation and level of polyamines implies that ozone-mediated increase in intracellular level of polyamines may inhibit appressorium formation in rice blast fungus. Furthermore, rice plants inoculated with ozone-fumigated conidia exhibited less severe disease development than those with unfumigated conidia. This result suggests that the anti-conidial consequence of acute ozone will eventually weaken the rice blasts potential for multiple infection cycle. This further suggests that consequently, rice blast can be transformed from an explosive disease to one that has limited epidemiological potential in the field.