In order to understand the impact for decomposition of blue-green algae Microcystis on water quality, the algae were cultivated with collection of natural population during approximately one month, when water-bloom of Microcystis dominated at August 31, 1999 in the lower part of the Okchon Stream. The enrichment of inorganic N·P nutrients didn't in algal assay and the effect of Microcystis on water quality was assessed from the variation of nutrients by algal senescence. Microcystis population seemed to play a temporary role of sink for nutrients in the water body. Initial algal density of Microcystis was 2.3×106 cells/ml. When Microcystis population died out under light condition, algal N·P nutrients between 9∼12 days affected to increase of biomass after reuse by other algal growth as soon as release to the ambient water. However, cellular nutrients under dark condition were almost moved into the water during algal cultivation. NH4, NO3 and SRP concentration were highly increased with 160, 17 and 79 folds, respectively relatve to the early. As a result, the senescence of Microcystis population seemed to be an important biological factor in which cause more eutrophy and increase of explosive algal development by a lot of nutrients transfer to water body. There are significantly observed an effort of reduce for production of inner organic matters such a phytoplankton as well as load pollutants from watershed in side of the water quality management of reservoir.

Purification of the isocitrate lyase extracted from Microbacterium laevaniformans was investigated. The isocitrate lyase was purified 43.6 folds by the following continuous treatment with ammonium sulfate fraction, DEAE-cellulose, DEAE-sephacel and Sephadex G-200 chromatography. The purified isocitrate lyase was showed to be a single protein band by polyacrylamide gel electrophoresis. The molecular weight of the purified isocitrate lyase was estimated 54,000 Da by the SDS-polyacrylamide gel electrophoresis. The Km and Vmax values for isocitrate were estimated to be 0.83mM and 0.33units/㎖, respectively. Activity of isocitrate lyase was inhibited by cystein-HCl and glutathione.

부화 및 착상에서 prostaglandins의 역할에 대한 연구는 많으나 배아단계에 따라 포배의 팽창과 부화에 미치는 영향에 대한 연구는 미미하다. 따라서 본 실험에서는 다양한 농도의 prostaglandins를 발생단계에 따라 처리하거나, indomethacin과 prostaglandins의 양 변화를 통해 팽창과 부화에 미치는 영향을 알아보고, 배아 단계별 PG 와 PG 의 생합성양 변화양상을 알아보았다. 100M이 상 농도의 PG 처리시 거의 모든

This paper discussed effect of the surface roughness and the hydrophobicity of support material on the microbial attachment in a rotating biological contactor. The hydrophobicity of each support material was determined by the measurement of contact angle of water and the surface roughness was measured by the surface roughness instrument. Microorganisms have well attached on the surface of more hydrophilic support material like Nylon6 than that of the hydrophobic support material like PE. When the relatively hydrophilic surface was roughen, the microbial attachment was increased but when the relatively hydrophobic surface was roughen, the attachment was slightly increased because the hydrophobicity of support material was increased by roughening the hydrophobic surface. Although both variables, the surface hydrophobicity and the surface roughness, have influenced the microbial attachment, the influence of the surface roughness overruled that of the surface hydrophobicity. Support material whose surfaces were roughened about l㎛, 6㎛ and 11㎛ were allowed for attached 3, 7 and 24hr, but the differences of maximum and minimum attachment of each material gave nearly constant values and similar trend with time.

As one of methodological approaches for objective and systematic evaluation for rural resources, a sequential system for significance determination of resources items was formulated using AHP (Analytic Hierarchy Process) as the base technique. By the system constructed in this study, the significance values were calculated for all items of standard goal system which had been presented in the first phase- paper of research works for rural resources evaluation. The results analysed and obtained in the study are summarized as follows; 1. In case that the number of resources items for evaluation are relatively large, stepwise matrix method is considered as the better one for pair-comparison works in view of evaluator's convenience and consistency. 2. The significance valuing results for most resources items showed a considerable difference between characteristic areas, especially in aspects of land and human resources, so being considered as wet reflecting the specific areal varieties, 3. On land resources, the items for industrial development and land use showed higher significance value, while natural environment resources the items for ecological varieties and on human resources the items for artificial facilities. However, lower-valued ones were the items for mineral stocks in land resources, for control and protection in natural environment resources and for lower-level culture heritage respectively.

Kim, Bong-won * · Kim, Yoo-ill *1 Dept. of Landscape Architecture, Sungkyunkwan Univ. ABSTRACT The purpose of this study was to evaluate the Quality of Life with a sample set collected from 37F residents in Seoul Metropolitan's countryside. Collected data were analyzed by means of regression analysis. Research results indicated that the predictors of Quality of Life had a relationship with'job satisfaction','self satisfaction','residential satisfaction','income satisfaction'and other variables(Ra= .48). The residents who strongly satisfied with those variables were likely to satisfy with their life. Also, the existence of toyon office and the educational level emerged as a significant factors for the life satisfaction. This means that the residents located at toyon office or educated higher level satisfied more on their life. Thus the personal characteristics and environmental attributes played a basic role on the life satisfaction. Implications for future research are discussed, and methodological and analytical weaknesses of this study are identified.

건답직파재배할 때 부토심(1, 3, 5, 7cm)에 따른 벼의 출아, 생육 및 수량관련형질에 미치는 영향을 알기 위하여 indica×japonica 3개 품종(칠성벼, 가야벼, 삼강벼)과 japonica 7개 품종(영산벼, 영덕벼, 화진벼, 팔공벼, 섬진벼, 탐진벼, 밀양 9005) 및 indica 2개 품종(Tebonnet, Lemont)을 공시하여 얻은 결과를 요약하면 다음과 같다. 1. 생장상에서는 부토심이 얕을수록 출아가 빨랐다. 그러나 포장에서는 3 > 1 > 5 > 7cm 순으로 출아가 빨랐지만 3, 1, 5cm 간에는 차이가 적었다. 생장상에서 부토심이 깊을수록 발아율이 감소하였으나 그 차이는 커지 않았고, 출아율, 출아율/발아율 비율은 1 및 3cm 부토에서는 비슷하게 높았고, 5 및 7cm 부토심에서는 낮았다. 2. 부토심 1cm에서 중배축장은 0.1～0.2cm, 초엽장은 0.8～1.1cm로 품종간에 차이가 없었다. 부토심 3, 5, 7cm에서 중배축장은 1cm 부토보다 길었으나 부토심이 깊을수록 중배축이 현저히 신장되는 Tebonnet를 제외하면 부토심간에 큰 차이가 없었다. 부토심 3, 5, 7cm에서는 어느 품종이나 부토심이 깊을수록 초엽장이 현저히 신장되었다. 부토심 7cm에서 중배축과 초엽의 합한 길이는 출아율, 출아율/발아율과 비유과 정의 상관이 있었으며, Tebonnet는 중배축장과 초엽이 함께 신장하고, 다른 품종은 주로 초엽이 신장하여 출아하였다. 3. 포장에서 10개 품종을 평균한 입모수와 최고분벽수는 1, 3, 및 5cm 부토심에서는 부토심가에 차이가 없었으나 7cm 부토시에서는 낮았으며, 수수는 차이가 없었다. 출수기, 간장, 수장, 수당 및 단위면적당 영화수와 등숙율, 수량은 모두 품종을 평균하였을 때 부토심간에 차이가 없었으나, 천입종과 수확지수는 부토심 7cm에서 1cm, 3cm, 5cm에서 보다 다소 높았다.e 및 free fatty acid) 는 13.3～17.4%로 나타났다.로 빠른 시일에 집중적인 연구가 필요하다고 본다.다. 4. 저온저장(4℃ , RH 50%)한 벼는 2년반 저장한 벼도 밥맛의 변화가 거의 없었다. 5. 1988년산 및 1989년산 일반계를 10분도와 12분도로 도정하였을 때 도정도에 따른 밥맛의 차이는 없었다.X>CoOx는 Co3O4 로 존재하고, 반응 전의 경우에는 이와는 다른 chemical state를 보여주었다. XRD 및 XPS 결과를 바탕으로, 촉매표면에 존재하는 Co3O4 의 외부표면이 Co2TiO4 와 CoTiO3 같은 CoTiOx 로 encapsulation되어 있는 모델구조를 제안할 수 있고, 이는 반응시간의 함수로 나타나는 촉매활성에 있어서 전이영역의 존재를 잘 설명할 수 있을 뿐만 아니라, XRD와 XPS에서 얻어진 촉매의 물리화학적인 특성을 잘 반영할 수 있다. 나타냈고, 골격근과 눈 조직에서 피루브산에 대한 LDH의 친화력이 상당히 크므로 LDH가 혐기적 조건에서 효율적으로 기능을 하는 것으로 사료된다.5) and "Cleanliness of clothes ＆ features" (p ＜0.05) of VIP ward were significantly higher than those of a general ward.tive to apply.아울러 고려(考慮)해야 한다. 이것은 고무기술자(技術者)가 당면(當面)해야할 과제(課題)에 속(屬)하며 바람직 한것은 본장(本章)의 내용(內容)이 여러 상황하(狀況下)에서 당면(當面)한 문제(問題)에 대(對)해 어떻게 대처(對處)해 야 할지를 모르는 여러 기술자(技術者)들에게 도움이 되었으면 하는 것이다. 얻어짐을 알았다. 여기서의 합성분말을 이용하여

수도 Japonica 품종들에 있어서 GA3 에 적절히 반응하는 품종을 선발할 것을 목적으로 출수기 30일전에 GA3 50ppm을 처리하여 간장, 절간장, 신장절간수 및 수장에 미치는 효과를 조사하였다. 3. 결과를 요약하면 다음과 같다. 1. 대부분의 품종에서 GA3 처리가 간장을 증가시켰으나 그 정도는 일률적이지 않았으며 간장이 단축된 품종도 있었다. 단간품종이 장간품종보다 상대적으로 절간신장 정도가 컸다. 2. GA3 를 처리하여 각 절간별로 신장정도를 보면 제 1, 5, 6, 7절간은 증가하였고 제 2, 3, 4 절간은 오히려 단축되었다. 특히 제3절간은 현저하게 단축되었고 제5절간은 현저하게 증가하여 간장의 증감은 제 3절간과 제 5절간에 의해 좌우되었다. 3. 뚜렷한 신장반응을 보이는 절간수는 많은 품종에 있어서 변화하지 않았으나 1절간 증가한 것이 41 품종, 2절간 증가한 것이 5품종 있었다. 그러나 3품종은 1절간이 감소하였다. 4. GA3 를 처리함으로써 수장은 대체로 감소하는 경향이었으며 단간과 장간 품종에서 모두 일정한 경향을 보이지 않았다. 5. GA3 반응성외 정도를 6개군으로 구분하였는데 많은 품종들이 반응하지 않는 0군에 포함되고 간장이 25% 이상 증가한 것과 15% 이상 단축된 것도 있었다. 이것은 생육시기에 따라 GA 반응이 다르다는 이전의 보고를 감안하여 품종군 구별에는 GA3 처리시기가 고려되어야 할 것으로 고찰하였다.

The transportations of most of cargoes in world trade have been fulfilled through sea lanes and it seems this trend will not change in near future. Nowadays, inview of the technical aspects of merchant vessels, they are continuously enlarged in hull size and greatly specialized in structure for the cargo spaces and dramatically automatized in navigating, piloting, cargo operating and various other operations, which unavoidably require high technicals in operating the modern merchant vessels. On the contrary to the trend of requiring of operating high technicals, the capabilities of crew on board have been gradually declining in technical competence and their morale for accomplishing their duties on board vessels has greatly falled won compared with that of old days. The above result inevitably brings many problems in operating modern vessels and causes accidents which are avoidable through good competence and high morale of the crew. We intend to analyze the causes of several great sea accident with which it seems some human errors are connected more or less directly or indirectly. We hope that this study could suggest some measures which help to prevent the recurrence of similar accidents by Korean ship's crews.