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Salmonella 및 Shigella 으l 葉郵l耐性의 樣相에 關한 調査硏究
柳在根(Jae Keun Ryu) 한국환경보건학회 1974 한국환경보건학회지 Vol.1 No.1
The agar p\ate titrations of antibiotic Eensitivities of Salmonella and Shigella iso\ated from human during 1967 to 1972 were studies. 1. The most effective antibiotics against Salmonella and Shigella were ch\oramphenicol, tetracyc\ine. kanamycin, minomycin, and gentamycin. 2. AI1 strain of Sa\monella typhi were resistant to cloxacilline. 3. The most effective antíbiotics against Shigella were kanamycin, gentamycin and minomycin.
팔당호 (八堂湖) 저서성 (底棲性) 대형무척추동물의 (大型無脊椎動物) 군집분석과 (群集分析) 현존량의 계절적 동태
윤일병,공동수,유재근,이상욱 ( Il Byong Yoon,Dong Su Kong,Jae Keun Ryu,Sang Wook Lee ) 한국하천호수학회 1990 생태와 환경 Vol.23 No.1
P`altang reservoir is a streamlike one of which mean depth is low (6.7 m) and water volume is small while its basin area is large comparatively. The broad littoral zone is developed in P`altang reservoir and the aquatic fauna and flora is enriched. Particulary, Mollusks of benthic macroinvertebrates are most abundant in Korean fresh lakes and marshes. This study have been carried out to grasp the community structure and dynamics of standing crops. The results are as follow. 1. The taxa of benthic macroinvertebrates collected from April, 1988 to November, 1989 was 4 phylla 7 classes 19 orders 39 families 82 species. Insects are a dominant taxa in species composition. 2. Annual mean biomass is 10.46 gDW/㎡ (382 ton in total area) as dry weight of tissue except shell. Pelecypods and Gastropods occupy 51% and 35% comparatively, and Mollusks occupies 86%. The largest standing crops is 17.04 gDW/㎡ in last week of September. 3. Variation of standing crops according to water depths is not conspicuous because the inconspicuous water temperature and oxygen concentration gradient can`t limit the growth of benthos. 4. Dominant speicies as standing crops of individuals are Limnodrilus socialis (35%), Chironomus sp. 2 (23%), and Parafossarulus manchouricus (12%); Dominant ones as standing crops of biomass are Anodonta fukudai (28%), Parafossarulus manchouricus (19 %), Unio douglasiae (18%), and Cipangopaludina chinensis (10%). 5. Species diversity (Llyod`s H`) is ranged 1.36∼2.52 and annual mean diversity is 2.16 (β-mesosaprobic).
저서성 (低棲性) 대형무척추동물에 의한 생물학적 수질평가 연구 (2) - 생물군집에 대한 환경요인 영향을 중심으로 -
윤일병,공동수,유재근 ( Il Byong Yoon,Dong Soo Kong,Jae Keun Ryu ) 한국환경생물학회 1992 환경생물 : 환경생물학회지 Vol.10 No.1
In this present paper, biological characteristics of Korean benthic macroinvertebrate 173 taxa to physicochemical factors were examined from data matrix investigated by authors etc. at 613 sampling units in Korean streams and lakes since 1971. That is, saprophility, watercourse types, lithophility, currentphility, thermality, oxyphility, and acidoalkality of each taxon were examined and also minimal, optimal, and maximum BOD5 concentration ranges were evaluated. Particulary, groups clustered by species similarity analysis showed high relation to substratum, current types, and saprobity through simple discriminant analysis.
저서성 (低棲性) 대형무척추동물에 의한 생물학적 수질평가 연구 (3) - 육안적 간이수질평가방법을 중심으로 -
윤일병,공동수,유재근 ( Il Byong Yoon,Dong Soo Kong,Jae Keun Ryu ) 한국환경생물학회 1992 환경생물 : 환경생물학회지 Vol.10 No.2
In this present paper, simple water quality evaluation method using Korean benthic macroinvertebrate 29 systematic groups was proposed from data matrix investigated by authors etc. at 613 sampling units in Korean streams and lakes since 1971. The evaluation of water quality criteria by this method showed identity of 63% in 378 sampling to chemical evaluation. Also we proposed the quantitative index named Yoon-Kong`s GPI (Group pollution index) and this index showed correlation coefficient over 0.9 to Pantle-Buck`s saprobic index S and Yoon-Kong`s Total Biotic Score, TBS.
임연택,서정범,유재근 ( Yeon Taek Rim,Jeong Beom Seo,Jae Keun Ryu ) 한국물환경학회 1998 한국물환경학회지 Vol.14 No.1
Treatability and pressure difference in ultrafiltration was investigated in sequential anaerobic/aerobic activated sludge wastewater treatment system. Ultrafiltration had advantages for sludge separation than secondary sludge settling tank in biological wastewater treatment system. Clean and steady water quality in effluent was achieved but the flux was decreased with the lapse of time. Accordingly, the influence of control parameters of backwashing intervals and various loading rate to treatment efficiency and pressure difference to sustain steady flux were studied for the combination process of activated sludge and ultrafiltration membrane. The effluent BOD concentration showed less than 2㎎/l and T-N resulted in 11.5∼21.2㎎/l in this system. When organic loading rate was 0.5㎏BOD/㎥·d with less than 0.04㎏/c㎡ pressure difference the system could be controlled to sustain 0.2㎥/㎡·d flux. Specifically, hydrophilic membrane showed less than 0.02㎏/c㎡ pressure difference. Flux of 0.2㎥/㎡·d required 0.04㎏/c㎡ pressure difference but higher pressure difference was required to raise flux. Outside pressure infiltration and suction infiltration were compared. 0.25∼0.35㎏/c㎡ pressure difference was required to earn 0.2㎥/㎡·d of flux for outside pressure infiltration but only 0.04㎏/c㎡ pressure difference was required for the same flux of in the case of suction infiltration. In conclusion, there were no difference in effluent water quality between filtration by hydrophobic membrane and hydrophilic membrane but lower pressure difference was required by hydrophilic membrane to earn steady flux rate. When flux and organic loading rate in the reactor was raised, the required pressure difference was dramatically increased. In the case of longer backwashing intervals pressure difference tends to build up.
팔당호의 생태학적 연구 - 2. 식물플랑크톤의 군집 구조의 변화 -
한명수,어윤열,유재근,유광일,최영길 ( Myung Soo Han,Yun Yeol Auh,Jae Keun Ryu,Kwang Il Yoo,Yong Keel Choi ) 한국하천호수학회 1995 생태와 환경 Vol.28 No.3
In order to examine the changes in phytoplankton community structure in Pal`tang river-reservoir system and to describe some of their interrelations, 4 stations were chosen. Observations were carried out for four times at the Pal`tang reservoir and the lower part of three rivers such as North Han river, South Han river and Kyung-An stream from April 1992 to May 1993 and these data were analyzed with other published data. A total of 60 taxa in phytoplankton: of these, 24 were Bacillariophyceae, 29 were Chlorophyceae, five were Dinophyceae, the other taxa as Chrysophyceae, Cryptophyceae were identified one species, respectively. Rapid eutrophication contribute to the shift of the chief components of the total phytoplankton community from Bacillariophyceae to Bacillariophyceae including Chlorophyceae. Among them, Autacoseira(=Melosira) granulata dominated continuously in this study area since 1980. Changes in Phytoplankton community structure in Station 4(Pal`tang reservoir) affected by the longitudinal transport along each river strech in Pal`tang river-reservoir system. However, Changes of phytoplankton community structure probably were affected by its growth characteristics during the stagnation period of water column. Station 3(Kyung-An Stream) is heavily eutrophicated due to stagnation of water column.
최승익,안태석,양상용,유홍일,유재근 ( Seung Ik Choi,Tae Seok Ahn,Sang Yong Yang,Hong Il Rhu,Jae Keun Ryu ) 한국하천호수학회 1994 생태와 환경 Vol.27 No.2
To define the effects of fish(Hypophihalmichthys molltrix) predation on phytoplankton densities and activities of extracellular enzymes including phosphatase, cellobiohydrolase and β-glucosidase were weekly investigated both in fish and control aquariums. Eventhough there was no increment of nutrients by fish predation, chl. a concentration in the fish aquarium was 12.6mg m^-3, twice higher than in the control, and total bacterial number(AODC) was 1.1x10^7cells ml^-1, 5 times higher than control aquarium after 25 days. The V_(max) and K_m values of extracellular enzyme activities were higher in the fish aquarium. Especially, the V_(max) of β-glucosidase in the fish aquarium was 7 times higher than in the control. These results suggest that the predation and digestion of Hypophihalmichthys molltrix should cause the diversification of substrates of extracellular enzymes and stimulate nutrient cycles and degradation of organic materials.
임병진,김범철,유광일,유재근 ( Byung Jin Lim,Bom Chul Kim,Kwang Il Yoo,Jae Keun Ryu ) 한국하천호수학회 1997 생태와 환경 Vol.30 No.4
Changes of zooplankton community was observed at six stations during the period from June to October 1994 in Nakdong River. 40 species of zooplankton were identified; 11 genera and 14 species of cladocerans, 7 genera and 9 species including one unidentified species of copepods, and 9 genera and 17 species of rotifers. The dominant species of Zooplankton were Asplanchna priodonta, Brachionus angularis, Moina macrocopa. Copepod copepodids and nauplii were always dominant. The highest densities of rotifer were always observed at all stations. The seasonal fluctuation of abundance of zooplankton varied from 1,510 indiv. /m^3 to 1,024,093 indiv. /m^3 by months and stations. From June to October, chlorophyll-a ranged from 1.7 mg/m^3 to 173.6 mg/m^3. There was a prominent rise in phytoplankton biomass for the most stations from July to September.