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Algal bioassay 에 의한 조류생장 제한영양염류 결정
오희목(Hee Mock Oh),이석준(Seog June Lee),김성빈(Seong Bin Kim),박미경(Mi Kyung Park),윤병대(Byung Dae Yoon),김도한(Do Han Kim) 한국하천호수학회 1998 생태와 환경 Vol.31 No.2
Determination of Limiting Nutrient for Algal Growth by Algal Bioassay. Oh, Hee-Mock, Seog June Lee, Seong-Bin Kim, Mi- Kyung Park, Byung-Dae Yoon and Do-Han Kim (Environmental Microbiology Research Unit, Korea Research Institute of Bioscience and Biotechnology, Taejon 305-333, Korea and Water Resources Research Institute, Korea Water Resources Corporation, Taejon 305-390, Korea) Water quaiity and algal growth potential (AGP) using Microcystis aeruginosa were investigated from April to September 1997 in Daechung Reservoir. Secchi disk transparency was 1.1 m in August. Chlorophyll-a concentrations were higher than 10㎍/l at all samples. Total phosphorus concentration was in a range of 0.020∼0.027mg/l which is at the approximate value of 0.03 mg/l, the general critical level of eutrophication. These results indicate that Daechung Reservoir is in an eutrophic state except some temporary times and restricted sites. Phosphorus uptake rate of M. aeruginosa was higher in the water from the epilimnion than in the hypolimnion and also higher under light condition than under dark condition. Therefore, phosphorus uptake rate appears to depend on cellular phosphorous content and light condition, a meaning of endergonic process. Phosphorus was the most frequently limiting nutrient: phosphorus was limiting algal gowth in April and May, nitrogen, phosphorus and trace elements were the limiting factors for algae in August, and trace elements in September. If a fast growing alga, M, aeruginosa, is used as a test organism for assaying AGP, in vivo fluorescence instead of dry weight can be measured for algal biomass and incubation period can be reduced from traditional 14 days to 7 days.
윤복연,문덕환,박명희,황용식,함성애,손병철,김대환,이창희,김휘동,이채언 인제대학교 백병원 2002 仁濟醫學 Vol.23 No.5
Objective : This study was conducted to prepare the fundamental data on heavy metal concentration in hair permanents agents and to prevent the health impairment due to heavy metal. Methods and Material : The author determined of 5 heavy metals(Pb, Cr, Mn, Ni, and Cu) concentration hair permanent agents in the market with flameless atomic absorption spectrophotometer. Results : The results were as follows: 1. The geometic mean concentrations of total subjects were 0.04㎍/g for Pb, 0.09㎍/g for Cr, 0.06㎍/g for Mn, 0.03㎍/g for Ni, and 0.04㎍/g for Cu. 2. The most highest mean concentrations of heavy metals in hair permanent agents by using type were Cr for wave agent and straight cream agent, Cu for setting iron agent, Cr and Cu for coating perm agent. 3. Metal most hlghest mean concentrations of heavy in hair permanent agents by type of color was green for Cu. 4. The mean concentration of Cu among 5 heavy metals in hair permanent agents by marker was most highest. 5. There was most statistically significant difference on mean concentration in hair permanent agents between domestic and foreign products. 6. The exposure amount of heavy metal concentration by one time using the permanent agent were 4.O㎍ for Pb, 9.O㎍ for Cr, 6.0㎍ for Mn, 3.O㎍ for Ni and 4.0㎍ for Cu. Conclusion : As above results author suggest to prepare the preventive program of health impairment due to heavy metal by long term chronic exposure to who were using the hair permanent agents hair designer and customers.
광주지역 일부 남성의 연령과 배뇨량에 따른 최고요속 정상치
윤희철,박희수,노준,장대수 조선대학교 부설 의학연구소 2000 The Medical Journal of Chosun University Vol.25 No.1
Background and Objective : The Peak or maximum uroflow rate has been useful in screening test for the diagnosis of lower urinary tract dysfunction, and is used as a parameter in the diagnosis of lower urinary tract dysfunction, such as prostatism, urethral stricture, or neurogenic bladder, and the postoperative assessment of adequate surgery in urologic patients. We need a peak uroflow rate nomogram for the adjusted peak uroflow, because uroflow in normal healthy men depends on the voided volume and decreases with age. Materials and Methods : Peak flow rates and volumes voided were measured in 315 males who were free of voiding dysfunction, ranging in age from 10 to 80. To search for the equation of age, voided volume and peak uroflow, we used the least squares method for the equation providing least residual standard deviation by SPSS program. Results : The equation of age, volume voided and peak flow rate is Q=24.383+0.413A-0.006934A2-1164.644/V (Q: peak flow rate, A: Age, V: voided volume). Means of measured age, volumes voided, and peak flow rate was 45.7, 227.6ml, and 20.7ml/sec respectively. At this point, reference peak uroflow is 23.6m1/sec. Adjusted peak uroflow was obtained by subtracting the difference between the measured and expected peak uroflow from the reference peak uroflow. According to the equation Q, We designed nomogram with adjusted peak uroflow rate used. Conclusions : In our nomogram an adjusted peak flow rate <.8ml /sec(1.2 standard deviation) should be considered suspicious for lower urinary tract obstruction. This peak uroflow rate nomogram can be used clinically to evaluate lower urinary tract obstruction and its postoperative assessment.
Lymphangioma에 의한 거설증을 지닌 환자의 개교합 증례보고 : A CASE REPORT
윤희훈,이상대,김영재,장기택,한세현,이상훈 大韓小兒齒科學會 2004 大韓小兒齒科學會誌 Vol.31 No.2
Lymphangioma는 림프관에 나타나는 양성종양으로 림프관의 증식을 특징으로 한다. 이 종양의 대부분은 출생 시에 나타나며 종양의 95%정도가 10세 이전에 나타난다. 구강 내에 발생하는 경우에는 혀에서 가장 호발하며 거설증을 야기한다. 대개 양측성으로 혀의 전방 2/3부위에 나타나며 불규칙한 회색과 핑크빛을 띤 소절형태를 보인다. 본 증례 모두에서 환아들은 출생당시 혀에 lymphangioma를 지니고 태어나 거설증을 보였으며 이로 인해 개교합과 하악과성장 양상을 나타내었다. Lymphangioma에 의한 비정상적인 혀의 비대에 의해 환아의 구강과 두개안면부의 주위조직에 대한 적응 결과로 나타난 소견을 관찰하고 관련문헌을 고찰하여 다소의 지견을 얻었기에 보고하는 바이다. Lymphangioma is a benign tumor of lymphatic vessels. The majority of cases are present at birth and 95% of the tumors aroused before the age of 10 years. Oral lymphangioma may occur at various sites but are most frequent on the anterior two thirds of the tongue, where they often result in macroglossia. The lesions present nodularity with gray and pink projections. In the present cases, all the patients who had the macroglossia combined with lymphangioma showed openbite and mandibular prognathism. The purpose of this paper was to report the dental and craniofacial findings of macroglossia combined with lymphangioma and review the pertinent literature through the cases.
고령토로부터 알루미나 추출에 관한 연구(Ⅰ) : 황산에 의한 추출
유대선,윤종석,이희수 연세대학교 산업기술연구소 1990 논문집 Vol.22 No.1
The preparation conditions of alumina powder extracted by sulfuric acid were investigated. The raw material was domestic San-Cheong Kaolin. The experimental conditions which have an effect on the yield of alumina were varied as follows; the calcination temperature and time, the reaction temperature and time, and the acid concentration. The agglomeration of aluminum hydroxides precipitated by ammonia water was controlled by various drying methods. And the dried power was heated to obtain α-Al₂O₃for 1 hour at 1200℃. The yield of alumina was up to 58 percent under the optimum condition and its purity was 96.4 percent. The alumina particles prepared by the freeze drying method revealed narrower size distribution and less agglomerate than others.