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        • 한국 초파리 自然集團의 성적도태에 관한 유전학적 연구

          朴殷圭 圓光大學校 基礎自然科學硏究所 1987 基礎科學硏究誌 Vol.6 No.3

          本 實驗에서는 한국 自然集團에서 授集한 D.melanogaster와 突然變異型의 第 1 染色體에 보유되어 있는 몇 개의 遺傳子의 頻度를 파악하여 性的淘汰에 대한 集團의 遺傳的 構适을 밝히고자 하였다. 本 實驗에서는 集團餃育箱子內에서 伴性遺傳 突然變異型 초파리 3個의 系統이 野生型 초파리와 競爭하면서 살아가는 행동을 硏究 조사하였는데, 本 實驗에 選擇된 突然變異型 系統이 自然眼 초파리, 黃色體 초파리 그리고 黃色體 및 自然眼 초파리였다. 이 實驗의 일부는 46世代동안이나 계속 되었었다. 相異한 集團에서 相異한 比率로 나타나기는 했지만, 모든 경우에서 突然變異型의 頻度가 減退하고 野生型의 頻度가 增加하였다. 本人은 그 比率을 결정하는 것은 수컷이 配偶者를 획득할 수 있는 能力의 차이에 의해서 說明할 수 있고 암컷의 生存能力이나 生産能力과 같은 다른 차이는 초파리에서는 비교적 重要한 요인이 아니다는 結論을 내릴 수 있었다. 한국 自然集團에서 授集한 野生型 초파리 30쌍과 突然變異型 自然根 초파리 30쌍, 黃色體 초파리 30쌍, 黃色體 및 自然眼 초파리 30쌍으로 名集團飼育箱子에 혼입하여 계속 飼育하였다. 이때 그들 초파리 사이에서 生存價는 같았지만 黃色體 암컷 초파리는 3∼9世代부터, 그 同一種 수컷 초파리(y/??♂)는 10∼21世代 이후로 名 集團飼育箱子에서 除去되었으며, 黃色體 및 自然眼 암컷 초파리도 2∼4世代부터 그 同一種 수컷 초파리 (yw/??♂) 역시 10∼21世代부터 名 集團飼育箱子에서 한 마리도 남지 않았다. 이런 現象은 짝짓기에 있어서 突然變異型 초파리의 絞率이 낮았기 때문이며, 모든 種類의 암컷 초파리가 突然變異型 수컷 초파리를 得한 結果인 것이다. 특히 本 實驗의 結果는 黃色體 및 自然眼 암컷 초파리가 그 同一種 수컷 초파리를 獲得한다는 사실을 입증하고 있다. 한편 自然眼 초파리도 41∼42世代부터 異里와 木浦 集團飼育箱子에서 除去되었다. 따라서 한국 自然集團의 초파리가 미국 自然集團의 초파리보다 性的淘汰에 관한 遺傳的 郊率이 높다는 結果를 觀察할 수가 있었으며, 특히 한국 自然集團에서는 상주와 木浦 自然集團의 초파리가 월출산, 가야산 그리고 異里 自然集團의 초파리보다 性的淘汰에 관한 遺傳的 郊率이 높다는 結果를 觀察할 수가 있었다. 이러한 淘汰現象이야 말로 덜 適應한 초파리로 하여금 실로 짧은 기간에 淘汰될 수 있게 하는 强力한 性的淘汰를 보여준 한 例로 看做된다. The present experiments were carried out to understand the genetic structure of the natural populations by means of the frequencies of some genes on th first chromosomes of the mutants and D. melanogaster collected in Korean natural populations for the sexual selection experiment. The present experiments were carried out to study the behavior, in the population cages, of three sex-linked mutants of D. melanogaster in competition with wild type flies. These mutants were white-eyed flies, yellow-bodied flies, and yellow-bodied and whit-eyed flies. Some of these experiments were continued for as many as 46 generations. In all cases the frequency of the mutant for ms declined and the wild type increased, though at different rates in different population. I conclude that the rates can be accounted for by the differences in the ability of the males to acquire mates, and that other differences, such as viability and fecundity of th females, are relatively unimportant in this material. In each population cage, I set up a culture of D. melanogaster containing 30 pairs of wild type flies collected in Korean natural populations, 30 pairs of whit-eyed flies, 30 pairs of yellow-bodied flies and 30 pairs of yellow-bodied and white-eyed flies. Although they are equal with respect to surval, after 3 to 9 generations there was not a yellow-bodied female fly to be found in the culture. The same male fly(y/?♂)is also eliminated in each population cage in about 10 to 21 generations. After 2 to 4 generations, there was not a yellow-bodied and white-eyed female fly to be found in the culture. The same male fly(yw/?♂) is eliminated in each population cage in about 10 to 21 generations. This is due to the lower efficiency mutant flies in mating. All the females discriminate against mutant males. In the present experiments, I noted that yellow-bodied and white-eyed female flies(yw/yw♀) discriminate especially against the same male flies(yw/?♂). The white-eyed fly is also eliminated in Iri and Mok-Po population cages in about 41 to 42 generations. Hence, the flies of Korean natural population of D. melanogaster were showing much higher heritability for sexual selection than the flies of American natural population. In Korean natural population of D. melanogaster, the flies of sang-Ju and Mok-Po populations were showing much higher heritability for sexual selection than the flies of Mt. Ueol-chul, Mt. Gaya and Iri populations. It seems reasonable to assume that such sexual selection was strong enough to eliminate the less "fit" flies in a remarkably short span of time.

        • 醱酵食品에 對한 酵素化學的 硏究 : 고추成分이 麴菌의 酵素活性에 미치는 影響 The effect of red pepper components on the enzyme activity of Aspergillus oryzae

          이갑상 圓光大學校 基礎自然科學硏究所 1987 基礎科學硏究誌 Vol.6 No.2

          The effect of red pepper components on the enzyme activities of Aspergillus oryzae were studied. Efforts were made to apply the red pepper effect on improving the method of a Korean traditional fermented food. The water soluble fraction of red pepper activated the β-amylase activity at the low concentration. The addition of ether-acetone extract resulted in the marked inhibition of the enzyme activity at the concentration higher than 5%(w/v). NaOH partition fraction of ether-acetone extract showed the similar effect to ether-acetone extract. The inhibition of β-amylase activity by red pepper component was found to be a noncompetitive inhibition was revealed by Lineweaver-Burk plot. The enzyme inhibitor binding constant, Ki was obtained as 64.37 ㎎/㎖.

        • 고체내에서 입사전자의 투과곡선에 관한 Monte Carlo 계산

          최금란,유기수 圓光大學校 基礎自然科學硏究所 1987 基礎科學硏究誌 Vol.6 No.2

          The transmission T(x) of aluminium, copper, and gold in films are calculated with a Monte Carlo method for various incident energies. In this work we attempt to examine the applicability of a Monte Carlo method in connection with a single scattering model. From the normalized transmission T(x/x_0.5), the maximum range, R_max, and extrapolated range, R_E, are determined. The curves for different energies are also scaled to a unique transmission curve by T versus x/x_0.5. The calculations show good agreement with those of the experimental data but u=0.69 instead of u=1 in empirical formula for trasmission curve.

        • Acetylenic Thioether의 새로운 合成法

          李英行,李弘 圓光大學校 基礎自然科學硏究所 1982 基礎科學硏究誌 Vol.1 No.1

          Morpholine-iodine complex and phenylacetylene reacted exothermically to form a solid 1:1 adducts. The adducts were easily converted with water into iodophenglacetylene (1-iodo-2-phenylethyne). Treatment of iodopheny1 acetylene with sodium and thiol in THF led to acetylenic thiother.

        • 內藏山의 植生相

          金永植 圓光大學校 基礎自然科學硏究所 1986 基礎科學硏究誌 Vol.5 No.1

          The vegetation of Mt. Naejang was surveyed over twenty times from April, 1983 to August, 1985. Vascular plants were composed of 109 families, 370 genera, 525 species, 1 subspecies, 8 formae and 76 varieties or 610 taxa. Among them, 33 species of pteridophyte were identified, Fisher's Index of collected plants represented 402.1, biological type showed H-D_1-R_5, and e type of growth form dominated markedly.

        • Rhodochrosite로부터 Manganese(II) Sulfate의 浸出에 관한 最適條件의 硏究

          崔昌鎭,金城權 圓光大學校 基礎自然科學硏究所 1985 基礎科學硏究誌 Vol.4 No.1

          The leaching of manganese(Ⅱ) sulfate was carried out by domestic rhodochrosite sample with sulfuric acid. With the intention of obtaining optimum conditions of ore leaching, purification of leached solution, the components contained in leached solution were investigated by means of ICAP, Atomic absorption spectra, X-ray diffraction, Infrared spectra and chemical analysis. From the experimental results, the optimum leaching conditions were as follows: Concentration of sulfuric acid, 25∼30%; H_2SO_4/MnCo_3 equivalent ratio, 3.0∼3.5 equivalent ration; leaching time, 2.0∼3.0hrs; leaching temperature, 75℃. Under the best conditions the leaching efficiency of manganese(Ⅱ) sulfate was 96.2%. The contents of Iron, Calcium, Aluminum, Magnesium and Lead contained purified manganese(Ⅱ) sulfate 0.012%, 0.0031%, 0.0032%, 0.085% and trace, the purified products were almost manganese(Ⅱ) sulfate monohydrate and manganese(Ⅱ) sulfate in high purity.

        • Inducibility of UV mutagenesis in Aspergillus nidulans

          Han,,Dong,Min 圓光大學校 基礎自然科學硏究所 1989 基礎科學硏究誌 Vol.8 No.2

          The inducibility of radioresistancy and mutagenesis was examined in Aspergillus nidulans using mutation kinetics and split dose protocols. Mutation kinetics showed no biphasic linear patterns implyingthat UV mutagenesis in Aspergillus nidulans had no inducible fraction. Similar results were obtainedfrom the split dose experiment. Any inducibilty of the radioresistancy or mutation by pre-irradiationof small dose of UV was not found in actively growing cells. Inducible radioresistan'y was found onlyin the liquid-holded cells. The induced radioresistancy was due to the error-proof DNA repair. Inconclusion, UV mutagenic process in Aspergillus nidulans was not an inducible process but a consitutiveone.

        • DEPENDENCE IN MA MODELS WITH STOCHASTIC PROCESSES

          Kim,,Tae-Sung,Baek,,Jong-Il 圓光大學校 基礎自然科學硏究所 1993 基礎科學硏究誌 Vol.12 No.2

          In this paper we present of a class infinite MA(movingaverage) sequences of multivariate random vectors. We use the theory of positive dependence to show that in a variety of cases the classes of MA sequences are associated. We then apply the association to establish some probability bounds and moment inequalities for multivariate processes.

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