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.

Inhibitory Effects of Super Reductive Water on Plant Pathogenic Fungi

Hur, Jae-Seoun,Kim, Hae-Jin,Oh, Soon-Ok,Koh, Young-Jin,Kwak, Young-Se,Lee, Choong-Il The Korean Society of Plant Pathology 2002 Plant Pathology Journal Vol.18 No.5

The antifungal activity of super reductive water (SRW) against plant pathogenic fungi was examined to extend its application to integrated pest management (IPM) for plant diseases. Diluted solutions ($\times$1/10, $\times$1/25, and $\times$1/50) of SRW inhibited fungal growth of kiwifruit soft rot pathogen, Diaporthe actinidiae, in a concentration dependent manner, When kiwifruits were inoculated on wounds with mycelium blocks, stock and diluted solutions successfully inhibited the disease development. In addition to the high pH of the SRW, fungistatic activity was also considered as the cause of the antifungal effect against the pathogen. Whereas conidial germination of Magnaporthe grisea was not affected by the diluted SRW solutions, appressorium formation was significantly inhibited in a concentration dependent manner, With little harmfulness to human health and environment SRW could be used to control plant pathogenic fungi, particularly appressorium-forming fungal pathogens.

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..

Tolerant Responses against Environmental Stress of Indigenous Tree Species Selected at the Coal Waste Piles of Taeback Area

Jae Seoun Hur,Jae Cheon Lee,Sim Hee Han,Suk Seong Jang,Pan Gi Kim,Kyu Jin Yum 한국육종학회 2002 한국육종학회 학술발표회 발표요지 Vol.34 No.2

Effects of Atmospheric Ozone on the Rice Blast Pathogen Pyricularia grisea

Hur, Jae-Seoun,Kim, Ki-Woo,Kim, Pan-Gi,Yun, Sung-Chul,Park, Eun-Woo The Korean Society of Plant Pathology 2000 Plant Pathology Journal Vol.16 No.1

The direct effects of acute $\textrm{O}_3$ on the growth, sporulation and infection of Pyricularia grisea, rece blast pathogen, were investigated to understand the interactions between ozone and the pathogen. Acute exposure of 200 nl $\textrm{l}^{-1}$ ozone for 8 h significantly reduced conidia germination on water atar. Ozone exposure of 200 nl $\textrm{l}^{-1}$ for 8h per day for 5 days had no effect on increase in colony diameter, but severely damaged actively growing aerial mycelia. However, the damage to mycalia was recovered during the following 16 h exposure of unpolluted air. Conidial production was also stimulated by the acute ozone exposure for 5 days. The conidia exposed to the acute ozone for 5 days normally germinates but slightly reduce appressoria formation on rice leaf. However, the conidia produced by artificial stimulation under the same ozone concentration for 10 days showed significant reduction in appressorea for mation on a hydrophobic film. This study suggests that the acute ozone could ingibit appressoria formation as well as vegetative growth of the pathogen, resulting in decrease in rece blast development in the field during summer when high ozone episodes could occur occasionally.

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.

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.