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낙동강하구에 있어서 지하수위에 따른 식물군락의 연속구조와 종이양성지수의 변화에 관한 연구
장남기,강병찬 ( Nam Kee Chang,Byung Chan Kang ) 한국축산학회 1977 한국축산학회지 Vol.19 No.6
Changes of the distribution of plant communities and species diversity on the gradient of the water table in the delta of the Nakdong-river were studied by means of the method of Curtis and Patten, and the index of Shannon and Wiever. The communities were arranged in a single dimensioned ordination on the basis of the importance values of the persistent species. Leading dominant species from the low, level to the high level of the water table gradient, were Phragmites longivalvis, Cyperus flaridus, Ischaemum anthephoroides var. eriostachyum, Imperata cylindrica var. Koenigii, and Oenothera Lamarckiana. These species form a continuum depending upon available soil moistrue. Species diversity, oragnic constituents, standing crops, available P and exchangeable Na contents of soils showed a good relationship with gradients of the water table.
섬바디의 물질생산력 광합성 및 하고현상에 관한 생리생태학적연구
장남기,조기연 ( Nam Kee Chang,Ki Yeon Cho ) 한국축산학회 1977 한국축산학회지 Vol.19 No.6
This study was performed to find the effects of environmental factors on the seasonal changes of the matter production and of Dystaenia takesimana population in Seoul area in 1975. The peak value of standing crops of above-ground parts was 1,428.5 D.M. g/㎡ on October 27. The maximum productivity of above-ground parts was 55.21 D.M. g/㎡/day on July 38 to August 4 and that of under-ground parts was 26.72 D.M. g/㎡/day on July 18 to 28. The low productivities of above-ground parts were -17.47 D.M. g/㎡/day late in June and -48.42 D.M. g/㎡/day early and late in August. And those of under-ground parts were -31.9 D.M. g/㎡/day early in August and -14.5 D.M. g/㎡/day late in August. The range of optimum temperature of photosynthetic activity was from 17℃ to 19℃. The threshold of photosynthetic activity under the condition of relative maximum water holding capacity of 75% was 55㎎/dm²/hr. Summer decline phenomena of the matter production eras due to the high temperature and drought. This phenomena for Dystaenia takesimana was evidiently shown late in June and early sin August.
장남기,임문교,윤익석 ( Nam Kee Chang,Moon Kyo Lim,Ik Suk Yun ) 한국축산학회 1976 한국축산학회지 Vol.18 No.3
For the assessment of the gross metabolism in a grassland of Miscanthus sinensis in Maseoguri area, the assimilation and dissimilation of carbon in this grassland were investigated. T he results obtained in this study can be summarized as follows: 1. The photosynthetic rate at 300 ppm CO₂ and 30℃ was saturated with a light of about 50 klux in the field. 2. The photosynthetic rate at 50 klux and 30℃ was not saturated with a CO₂ concentration is the atmosphere. 3. The optimal temperature for photosynthesis was found to be approximately 35℃. 4. The leaves of Miscanthus sinensis which were located at the 5th and 6th nodes showed the maximum photosynthetic rates. 5. The peak productivity of the above-ground parts was 30.66g/㎡/day from July to August and that of the under-ground parts was 3.76g/㎡/day from August to September. 6. The time periods required for decomposition of 50%, 95% and 99% of initial organic carbon in the litter were 0.9, 4.0 and 6.7 years, respectively.
환경구배에 (環境勾配) 따른 식물성 Plankton 의 정규분포반응에 (正規分布反應) 관한 연구
장남기,진창덕 ( Nam Kee Chang,Chang Deog Jin ) 한국하천호수학회 1977 생태와 환경 Vol.10 No.3·4
Characteristics of normal curve were studied as a basis of the growth rate for interpreting the response of phytoplankton on environmental gradients. The relationship between the growth rate and the environmental gradients is described as (수식) where w`, m, Wm, X, μ, and δ are the growth rate, the sort of environmental factors, the maximum growth rate, the values of environmental gradients, the mean value of environmental gradients and the standard deviation, respectively. The quantative relationships between the growth rate and pH, and nitrogen concentration in a batch culture of Chlorella vulgaris were, respectively, (수식) and (수식)
진화 개념구조가 반영된 중학교 생물프로그램이 학생의 생명관에 미치는 효과
권혜련(Hye Ryun Kwon),김정석(Jung Seok Kim),장남기(Nam Kee Chang) 한국과학교육학회 2001 한국과학교육학회지 Vol.21 No.2
This study was designed to test the hypothesis that the biological conceptual structure reflected in secondary textbooks influence students` views of living things and based on that supposition to evaluate the effects of evolution oriented biology program on their viewpoints. The evolution oriented biology program has been developed with understanding biological phenomena through narrative explanation of singular events of major importance for the history of life. On the other hand the traditional program is to understand biological phenomena through explanation of structures and functions of living things. It was supposed that the evolution oriented biology program is more effective when it is instructed according to historical sequence. The agreement on evolutionary properties of living things were increased significantly by the evolution oriented biology program conducted according to historical sequence. But the agreement on origin and nature of living things was not changed. The biological achievement was not different among groups of each different program.
Rey - grass 류의 물질생산 , 단백질 , amino 산 , 엽록소 , Carotene , RNA 및 DNA 의 함량에 미치는 질소의 영향
장남기 (Nam Kee Chang) 한국식물학회 1973 Journal of Plant Biology Vol.16 No.1-2
To study the response to plant growth by the environmental factors, the effects of application of nitrogen on changes in the yield, crude protein, amino acids, chlorophyll, carotene, total phosphorus, acid-soluble phosphorus, phospholipids, RNA, and DNA were investigated with westerworlds(Lolium sublatum) and perennial rye-grasses(Lolium perenne). The amounts of dry weight, crude protein, amino acids, chlorophyll, carotene, total phosphorus, acid-soluble phosphorus, phospholipids, RNA and DNA of both rye-grasses increased with adequately increasing nitrogen, and reached a maximum with an adequate application of nitrogen. The relationships between yields and crude protein contents, crude protein and RNA contents, and yields and RNA contents of westerworlds and perennial rye-grasses were found to be positively correlated, respectively. Therefore, in general, the response to plant growth by the environmental factors such as nitrogen nutrient may be summarized as follows : ◁그림 삽입▷(원문을 참조하세요)
고려인삼의 근단에 (根端) 있어서 H2PO4- , K+ , Ca++ 및 Na+ 의 흡수패턴에 관한 연구
장남기(Nam Kee Chang),이웅상(Woong Sang Lee),오희목(Hee Mok Oh) 한국식물학회 1981 Journal of Plant Biology Vol.24 No.3
Uptake of phosphate, potassium, calcium and sodium ions by Korean ginseng (Panax ginseng C. A. Meyer) was investigated in excised roots. It was found that the uptake of these ions was mediated by dual or multiple patterns. In the range 0.009∼0.5mM, 0.10∼10.0mM, the uptake patterns of H_2PO_4^-, K^+, Ca^++, and Na^+ were described by 3, 2, 3, and 2 phases, respectively.
대두의 핵산 , 단백질 및 물질생산에 미치는 인산비과의 (燐酸肥科) 효과
장남기 (Nam Kee Chang) 한국식물학회 1973 Journal of Plant Biology Vol.16 No.1-2
The effect of phosphorus nutrition on the contents of deoxyribonucleic acid(DNA), ribonucleic acid(RNA), crude protein and plant growth of soybean plant(Glycine max. Merr.) was studied. Yields of the above- and under-ground parts of the soybean plant in terms of dry weight, the amounts of crude protein, RNA and DNA continued to increase with increasing phosphorus supply. The amounts of RNA and crude protein were highest in the leaf tissues where most intensive growth was taking place. The relationships among DNA, RNA, crude protein and plant growth appeared to consist of the central dogma which has immortalized, while DNA in plant tissue was subject to charges caused by external environmental facters such as phosphorus nutrition.
Paramecium bursaria 와 공생하는 Chlorella 와 Chlorella ellipsoidea 의 질소대사에 관한 비교연구
장남기(Nam Kee Chang),하권수(Kwon Soo Ha) 한국식물학회 1986 Journal of Plant Biology Vol.29 No.3
The excretion of ammonia and glutamine synthetase activities were measured in aposymbiotic Paramecium and symbiotic Paramecium. The uptake of nitrate and ammonia, and specific enzyme activities of nitrate reductase, glutamate dehydrogenase and glutamine synthetase were investigated in symbiotic Chlorella from Paramecium bursaria and Chlorella ellipsoidea. The ammonia concentration in the culture media of aposymbiotic Paramecium was increased according to the growth of the Paramecium but it was not changed in symbiotic Paramecium. Nitrate, the major nitrogen source, was taken up at a rate of 0.635 μmol/10^5 Chlorella/hr in Chlorella ellipsoidea. Most of ammonia was assimilated to glutamine by glutamine synthetase, fo which activity was 1,467 u㏖/㎎ protein/min in Chlorella ellipsoidea. Contrary to Chlorella ellipsoidea, ammonia and glutamine transported from the Paramecium were the nitrogen source of symbiotic Chlorella and ammonia was taken up at a rate of 3.854 n㏖/10^5 Chlorella/hr into symbiotic Chlorella. Most of ammonia were assimilated to glutamate by glutamate dehydrogenase in symbiotic Chlorella. The glutamate dehydrogenase (GDH/NADH) activity was 0.851 μ㏖/㎎ protein/min.