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가축 분변 유래 지표미생물 분포 및 항생제 내성 균주의 동정
김종규,이장훈,권혁구,Kim, Jong-Geu,Lee, Jang-Hoon,Kwon, Hyuk-Ku 한국환경보건학회 2011 한국환경보건학회지 Vol.37 No.4
Objectives: To estimate the microbial contaminant load discharged from livestock farms, we randomly selected livestock farmers of cattle, swine, and fowl and collected bacterial strains from domestic animals' feces and compost samples. Recently, as multi-antibiotic-resistant bacteria and super bacteria showing resistance to a variety of antibiotics have been reported one after another, the ecological and health hazard of antibiotic-resistant bacteria is emerging as an important issue. Methods: Monitored indicator microorganism constituents were totak coliform (TC), fecal coliform (FC), and aerobic bacteria. The multi-antibiotic-resistant bacteria were identified from investigated indicator microorganisms by 16S rRNA sequencing. Results: By microbiological analysis, the largest population of aerobic bacteria ($1.5{\times}10^5$ CFU/g) was found in cattle fecal compost, and total coliforms ($1.1{\times}10^7$ CFU/g) and fecal coliforms ($1.0{\times}10^5$ CFU/g) were found primarily in swine fecal compost, while the lowest population was found in fowl fecal compost. Among the 67 strains separated from aerobic bacteria, five strains expressing high antibiotic resistance were selected in each sample. We found the multi-antibiotic resistant strains to be Shigella boydii, Staphylococcus lentus, Acinetobacter sp. and Brevibacterium luteolum. Conclusions: These results suggest that increasing numbers of multi-antibiotic-resistant bacteria in the environment have a close relation to the reckless use of antibiotics with livestock.
김종규(Jong-geu Kim),이장훈(Jang-hoon Lee),이수영(Su-yong Lee),나경원(Kyung-won Na),나규환(Kyu-hwan Ra),최한영(Han-young Choi) 대한환경위생공학회 2009 대한환경위생공학회지 Vol.24 No.2
In this research, I carried out the adsorption and removal test of Pb, Ni, Co and Cu ions using organic substances spread out any where in the nature which can be obtained easily from our neighbor-such as Paulownia coreana, Pinus densiflora, Juniperus chinesis, Quercus dentata, Magnolia kobus, Platanus occidentalis, Gingko biloba, Diospyros kaki leaves. As the result of the research to find the best optional condition for the adsorption and removal, shows that the adsorption and removal ratio of Pb ion by a Paulownia coreana raw leaves is 99% at 70℃, those of Ni ion and Co ion by Magnolia kobus formalin treatment leaves are 79% at 70℃, 97% at 40℃ respectively. And that of Cu ion by Platanus occidentalis treatment leaves is 97% at 50℃ in mixed solution. As the result of comparing the removal ratio by raw leaves and formalin treatment leaves, the removal ratio of treatment is 30~90% more effective than raw leaves in most cases. And I concluded Pb > Cu > Co > Ni ion in multiple solution and Co > Ni > Cu >Pb ion in single solution after testing adsorption and removal ratio of mixed solution separately as time goes by. In general, the reactions were completed within first 5 minutes. The test result of measuring the hydrolysable tannin content of each leaf shows that an overcup Quercus dentata is 11.36%, a Diospyros kaki is 10.81% and the rest of them are 2.49~4.12% in raw leaves cases. In treatment leaves cases, an overcup Quercus dentata is 3.23% and the others are less than 1%.
金鐘奎(Jong Geu Kim),金南天(Nam Cheon Kim),閔達基(Dal Ki Min) 한국환경보건학회 1989 한국환경보건학회지 Vol.15 No.2
Dichromate reflux method for COD analysis is one of the useful and precise way to solve the organic content of the wastewater. But the standard procedure for COD is not entirely satisfa(:tory for sample containing appreciable amounts of inhibiting substance, especially chloride íon. Under the conditions of the established test, a big disadvantage of the rnethod is that dichromate oxidizes chloride quantitatively to chlorine. When it is necessary to use silver sulfate as a catalyst in the COD procedure, chloride must be removed before the addition of the catalyst. Silver sulfate and mecuric sulfate forms a precipitate of AgCl and HgC12 separately which is not completely oxidized during the test and, therefore, cannot be corrected for. So, we evaluate and compensate the amount of chloride oxidation in the absence of chemicals during the experimental procedure. Calculation of COD is made using the following reviced formula: real COD = tested COD .O.2277Cl.
고순도 수소함량에 따른 HCNG 연소특성 및 배출가스 영향 평가
이종태 ( Jong Tae Lee ),임윤성 ( Yun Sung Lim ),김형준 ( Hyung Jun Kim ),이성욱 ( Seong Wook Lee ),이장훈 ( Jang Hoon Lee ),김종규 ( Jong Geu Kim ) 한국분무공학회 2012 한국액체미립화학회지 Vol.17 No.3
This investigation decribes the effect of the combustion and emission characteristics of HCNG engine according to the high purity hydrogen contents, The HCNG fuel was made by the mixture with a high purity hydrogen (H2) and a natural gas. The test vehicle was applied to the bi-fuel (Gasoline and CNG) system and this system was modified from the fuel supply and fuel tank. In addition, the three premixed HCNG fuels with mixed rate of 10, 20 and 30% of hydrogen were used to maintain the safety. In order to analyze the combustion characteristics of HCNG and CNG, the fuel was injected in the combustor with constant volume. The exhaust emission from light duty vehicle with bi-fuel system was analyzed by a chassis dynamometer and emission analyzer. From these results, the reduction rate of NOx emission increased in the HCNG fuel and emission amount of THC and CO shows a similar level with CNG fuel. This study can be utilized the basic data for the development of a new business plans related with HCNG engines.
LCA 기법을 이용한 소맥분 생산 공정의 환경 영향 평가
추덕성,권혁구,김종규,이장훈,Chu, Duk-Sung,Kwon, Hyuk-Ku,Kim, Jong-Geu,Lee, Jang-Hoon 한국환경보건학회 2008 한국환경보건학회지 Vol.34 No.1
The life cycle assessment method for environmental impact assessment was used, in this study, to assess the production process of wheat flour which is the most important material in the food industry. Environmental impact assessments were compared between that of the Ministry of Environment, Republic of Korea (method I) with that of the Ministry of Commerce, Industry and Energy (method II). Life cycle inventories (LCI) was performed using internal and external databases and the production statistics database of company S. The procedure of life cycle impact assessment (LCIA) was followed in terms of classification, characterization, normalization and weighting to identify the key issues. The impact categories of method I were divided into 8 categories with consideration of : abiotic resources depletion, global warming, ozone depletion, photochemical oxidant creation, acidification and eutrophication. The impact categories of method II were divided into 10 categories with consideration of: abiotic resources depletion, global warming, ozone depletion, photochemical oxidant creation, acidification, eutrophication, human toxicity, freshwater aquatic ecotoxicity, marine aquatic ecotoxicity and terrestrial ecotoxicity.
권혁구,이장훈,김종규,Kwon, Hyuk-Ku,Lee, Jang-Hoon,Kim, Jong-Geu 한국환경보건학회 2012 한국환경보건학회지 Vol.38 No.2
Objectives: To estimate the multi-antibiotic resistant bacterial contaminant load discharged from livestock farms, we randomly selected livestock farms specializing in cattle, swine, and fowl and collected bacterial strains from domesticated animal feces and compost samples. Problems with resistance to antibiotics are becoming worldwide issues, and as the consumption of antibiotics appears to be excessive in Korea as well, the emergence of antibiotic resistant bacteria shows the possibility to cause potentially serious social problems. Methods: To monitor multi-antibiotic resistant bacterial constituents, aerobic bacteria and Escherichia coli were isolated from domesticated animal feces and compost. Antibiotic resistance testing was performed by the disc diffusion method using 13 different antibiotics. Results: Examining the degree of sensitivity to antibiotics of the aerobic bacteria originating from domesticated animal feces, fowl feces showed the highest distribution rate (35.5%), followed by swine feces compost (23.1%), swine feces (18.2%), cattle feces (14.9%), and cattle feces compost (8.2%). Antibiotic resistance tests of aerobic bacteria and E. coli originating from domestic animals feces resulted in 83.6% and 73.5% of each strain showing resistance to more than one antibiotic, respectively. Conclusions: These results suggest that increasing multi-antibiotic resistant bacteria in the environment has a close relation to the reckless use of antibiotics in livestock.
소경활혈탕가미방(疎經活血湯加味方)의 관절염에 미치는 효과
조주현 ( Joo-hyun Jo ),임지성 ( Ji-sung Im ),김종규 ( Jong-gyu Kim ),박중현 ( Jung-hyun Park ),최학순 ( Hag-soon Choi ),황규원 ( Geu-won Hwang ),송용선 ( Yung-sun Song ) 한방재활의학과학회 2021 한방재활의학과학회지 Vol.31 No.1
Objectives The aim of this study is to evaluate anti-inflammatory and anti-arthritic effects of Sogyunghwalhyel-tang-gamibang (SGHHTGB) in cell and animal models and also to suggest one of putative mechanisms underlying its anti-arthritic effects. Methods Enzyme-linked immunosorbent assay was applied to measure the concentrations of tumor necrosis factor-α (TNF-α), interleukin (IL)-1β, IL-6 and prostaglandin E2 (PGE2) in culture medium and blood serum and nitric oxide (NO) was assayed by Griess reagent. The expressions of inducible NO synthase (iNOS) and cyclooxygenase- 2 (COX-2) were analyzed by Western blot method. Results In a cell model using RAW264.7 macrophages stimulated with the endotoxin lipopolysaccharide (LPS), the drug, at its non-cytotoxic concentrations, inhibited the production of the pro-inflammatory cytokine TNF-α, IL-1β and IL-6. In addition, it suppressed the expression of the inflammatory enzyme iNOS and COX-2, and reduced the synthesis of the enzyme product NO (as stable nitrite) and PGE2 in activated macrophages. Meanwhile, in an animal model using rheumatic arthritis (RA) mice induced with injection of type II collagen antibody (CAb) and LPS, the drug improved clinical symptom of arthritis and reduced paw thickness and inflammatory cell infiltration. In blood of RA mice, the drug reduced serum levels of TNF-α, IL-1β, IL-6, nitrite, and PGE2, all inflammatory mediators produced by activated macrophages. Conclusions SGHHTGB may ameliorate CAb and LPS-induced RA in mice, presumably by inactivating macrophages that are capable of initiating joint inflammation by producing pro-inflammatory cytokines and expressing inflammatory enzymes. (J Korean Med Rehabil 2021;31(1):33-46)