스틸벤의 치환기 효과에 대한 분자궤도함수론적 해석

林性美,朴柄珏,李甲龍 대구효성가톨릭대학교 자연과학연구소 1992 基礎科學硏究論集 Vol.1992 No.1

치환 시틸벤 계열에 대해 HMO법으로 Hammett 치환기 상수를 해석하였다. 이 계열에서 치환기 상수에 대한 유도효과와 공명효과의 기여를 양자화학적 지수로 취하여 계산한 이론값이 Hammett 치환기 상수 σ_p와 병행성이 있음을 알았으며 이 이론값으로 치환 스틸벤의 쌍극자능률에 미치는 치환기 효과를 설명할 수 있었다. 아울러 이 화합물의 전자전이에 대한 최대 흡수파장(λ_max)은 HOMO와 LUMO 에너지의 차에 의존됨이 확인되었다. The Hammett's substituent constants were interpreted for substituted stilbenes by HMO method. The appropriate quantum chemical indices are chosen as independent contribution of the inductive and the resonance effects for substituent constants. It has been found that theoretical values, σ_p^th, defined as sum of the net charge, self atom polarizability and difference in HOMO energy between substituted- and unsubstituted stilbenes, correlated with experimental Hammett's substituent constants. The dipole moments were found to be correlated with differences in σ_p^th between two substituents for disubstituted stilbenes. It has been also found that transition optical spectra, λ_max of the substituted stilbenes depend on difference between the HOMO and the LUMO energy as expected.

Improved Micropropagation of Root Chicory, Cichorium intybus L. var. sativus.

Lim,Jung-Dae,Yang,Deok-Chun,Lee,Hyeon-Yong,Kim,Jong-Dai,Lee,Jin-Ha,Sung,Eun-Soo,Yu Chang-Yeon 한국자원식물학회 2004 Plant Resources Vol.7 No.1

The establishment of an efficient protocol for plant regeneration and micropropagation from leaf explant cultures of Chicory, Cichorium intybus L. var. sativus. is reported. Callus formation rate appeared 100% from explant in all growth regulators, but calli formed in the prensence of naphthaleneacetic acid (NAA) were appeared very compact and non-embryogenic state. The regenerated shoots were obtained from leaf explant cultures on solid MS medium containing different concentrations of cytokinins and auxin. The highest number of shoots (5.7) per explant and shoot growth (2.8cm) was obtained on MS medium containing 0.1 mg BAP L^-1 and 0.1 mg NAA L^-1. Indole acetic acid was the most suitable auxin for root formation among three auxins tested. 2,4-D had no effect on shoot and root formation.

담낭종양에서 CD24의 역할

임성철,이용,김동출,강길,변익건,박정희,최석민 朝鮮大學校 附設 醫學硏究所 2004 The Medical Journal of Chosun University Vol.29 No.2

CD24 is a small heavily glycosylated glycosylphosphatidylinosito-linked cell surface protein, which is expressed in hematologic malignancies as well as in a large variety of solid tumors, It appears to function as a ligand of PUselectin, an adhesion molecule that is present in activated platelets and endothelial cells. The authors aimed to evaluate CD24 protein expression in adenoma and adenocarcinoma of gallbladder to correlate to clinicopathologic data. The staining- was evaluated as stainability (negative, weak-, moderate-, strong-positive) and staining' patterns (membranous vs. intracytoplasmic) for statistical analysis. A highly significant association of cytoplasmic CD24 expression with adenocarcinoma compared to the adenoma of gallbladder was demonstrated. The present study demonstrates that CD24 was abundantly expressed on adenocarcinoma rather than on adenoma, but it was not statistically significant, Interrelation between the stainability or intracytoplasmic staining of CD24 and lymph node metastasis was not statistically significant. The authors conclude that CD24 is involved in tumorigenesis of gallbladder mucosa and intracytoplasmic expression of CD24 is an important molecular marker for malignant transformation.

중앙심벽형댐의 응력전이에 관한 연구

임희대,임찬수,이성용 忠南大學校 産業技術硏究所 1995 산업기술연구논문집 Vol.10 No.2

Various modes of load transfer may exist in rockfill dams. If the core is softer than the shells, load is transferred from the core onto the shells as a result of greater downward displacement of the core with respect to the shells. But if the core is stiffer than the shells, load transfer occurs from the shells onto the core. In this study, the mechanisms of load transfer in rockfill dams have been outlined and load transfer of Juam main and regulation dam with central core are evaluated by load transfer ratio. The load transfer ratio is defined as the ratio of computed values of major principal stresses in the core to the core overburden stresses. The vertical stresses are determined by the FEM, which use hyperbolic model and incremental method to simulate placement of successive layers of fill. The hyperbolic paramaters for the core was estimated from a series of conventional triaxial tests carried out during construction. From the results of this analyses and its comparison with the values measured by soil pressure meters, it has been shown that significant load transfer from the core to the shells was observed in two dams and that the load transfer ratios predicted are higher than the values measured.

齒科用 貴金屬 合金과 陶材사이의 化學的 結合에 關한 實驗的 硏究

林時德,남상용 대구산업정보대학 1992 논문집 Vol.6 No.-

Real bonding between metal and porcelain is influenced by various bonding Mecanisms which also influence each other, and is caused by aseries of complicated thermochemical reaction. For this reason, clear determination of the degree and distribution. Fators influencing the bonding strength consist of chemical bonding(including primary bond)52%, Mechanical bonding 22%, compression bonding 26%. Effects of the Base Metal Elements Added to Allots. The elements Sn, In, and Fe were added originally in accordanc with the concept that they might strengthen the Alloy though a dispersion effect. We heated the Degudent G. U Dental porcelain and analysis the surface elemental chang by Energy Dyspersive X-ray analysis and obtained the result that mainly the In element was concentrated to the alloy surface.

칼슘제 수관살포가 참다래의 과실 품질과 저장에 미치는 영향

임경호,나양기,임동근,마경철,조윤섭,김월수,이상현,박용서 全南大學校 農業科學技術硏究所 2001 農業科學技術硏究 Vol.36 No.-

This study were carried out to improve Kiwifruit quality and storage life. Three kinds of calcium compound were sprayed and calcium content of fruits, weight loss during fruit storage and fruit quality were investigated. Calcium contents within leaves and fruit were lower in Clef-non treatment than that of control. The calcium content in fruit pericarp of Kalk-H and CaCl2 was 0.04 to 0.05% higher than that of control. Fruit weight and soluble solids content at harvest was a little higher but acidity and fruit hardness was lowered. Fruit weight loss of Kalk-H and CaCl2 treatment was 1.39 to 1.53% lower than that of control during storage. The soluble solids of ripen fruit was 1.0 to 1.3% higher in all treatment and 0.8% higher in Kalk-H treatment in 120 of after storage. Fruit hardness of control fruit was higher at harvest but that of CaCl2 treatmented fruit was 0.39㎏/φ 5㎜ higher in 120 days of storage.

5次 敎育課程에 의한 中學校 科學 敎科書 比較分析 : 化學領域 Chemistry Contents

林性美,李甲龍 대구효성가톨릭대학교 자연과학연구소 1992 基礎科學硏究論集 Vol.1992 No.1

The contents for the chemistry parts in the five textbooks of middle school science 1, 2, 3 based on 5th middle school new curriculum were analyzed and compared with each other. The results showed as follows : (1) Most of textbooks were well organized in accordance with objectives and contents based on the new curriculum. (2) The contents of the textbooks had a little difference according to authors. (3) The quantity of space increased as the grade is moved up. (4) Most of textbooks dealt with observation and measurements, conditional controls, performance of laboratory equipments and discussion of results exceedingly in the content of experiments, but sefety educations were somewhat neglected.

스포츠 활동참여와 생활만족 및 우울성향 간의 관계

임상용 濟州大學敎 體育科學硏究所 1995 체육과학연구 Vol.1 No.-

The purpose of this study was to examine the Relationship of Sport Involvement, Depression and Life satisfaction for Unversity students. The subjects in the study consisted of 464 Unversity students. The instrument was used Life Satisfaction Index-Well Being (LSI-W) by Bigot(1974) and Self-Rating Depression Scale (SDS) by Zung and Durham(1965) Four-way analysis of variance were conducted to determine if there were differences for depression and life satisfaction a function of playing experience, sex, frequency, prolonged time. The results of this study were as follows ; first, sport involvers had better Life satisfaction and lower depression than Non-sport involvers. Second, the psychological effect of sport involvers as a function of sex was not significant for Life satisfaction, was significant for depression Third, the psychological effect of sport involvers as a function of sex, playing experience, frequency, prolonged time was not significant for depression and life satisfaction. In conclusion, sport involvement of Unversity student should be advocated because the possible psychological benefits such as increased satisfaction and low depression.

스포츠 참여와 청소년 비행에 관한 연구

임상용,윤상택 濟州大學敎 體育科學硏究所 1995 체육과학연구 Vol.1 No.-

The purpose of this study was to present a preliminary data of dynamic processes underlying the relationship between sport participation and delinquent behavior. More specifically, this study attempted to determine the relative contribution of 13 socioeconomic, sport environmental and sociopsychological variables in delinquent behavior among male and female athletes and nonathletes. The subject of this study was 1,292 male/female students form 19 selected middle schools(n=678) and high schools(n=613). Of the 1,292 in total sample, 336 were classified as athletes, and 926 were classified as nonathletes. Self-report questionnaires were administered to the sample. For the purpose of data analysis, correlation analysis, multiple regression analysis and analysis of variance was used. The major findings of the study were as follows. 1. Nonathletes exhibited significantly less delinquent behavior than athletes. 2. Male nonathletes exhibited less deliquency than male athletes while, female athletes did not differ significantly from female nonathletes in delinquent behavior. 3. Nonathletes exhibited significantly less delinquent behavior than athletes in both middle school students and high school students. 4. The 13 variables showed greater relevancc to delinquent behavior among nonathletes than atheletes. 5. The four variables of delinquent associates, delinquent value, self-concept, and boredom accounted for the greatest amount of the explained variance in delinquent behavior among male and female athletes and nonathletes. 6. Of the 13 variables among athletes, seven predictor variables were predictive of delinquent behavior. Delinquent value was the best predictor and followed by self-concept, delinquent associates, saticifaction of sport facilities, boredom, life level and sport value. Among nonathletes five variables were predictive of delinquent behavior. Age was the best predictor and the next predictors followed by delinquent associates, delinquent value, self-concept and frequency of sport participation. 7. Among male athletes, six predictor variables were predictive of delinquent behavior. Self-concept was the best predictor and followed by delinquent value, satisfaction of sport facilities, boredom, delinquent associates and sport value. On the other hand, among male nonathletes, five predictor variables were predictive of delinquent behavior. Age was the best predictor and the next ranking order followed by delinquent associates, delinquent value, self-concept and frequency of sport participation. 8. Among female athletes, three predictor variables were predictive of delinquent behavior. Delinquent associates was the best predictor and followed by age, boredom. On the other hand, among female nonathletes, four predictor variables were predictive of delinquent behavior. Delinquent associates was the best predictor and followed by delinquent value, self-concept and boredom.

All-Trans Retinoic Acid에 의한 HL-60 세포 분화유도중 H2B Histone, c-Myc 및 DNA Topoisomerase I 발현에 관한 연구

임규,박정동,최병한,이용진,김계영,이명선,장은미,김삼용,권기량,곽상태,황병두 忠南大學校 癌共同硏究所 1998 癌共同硏究所 硏究誌 Vol.2 No.1

Effects of all-trans retinoic acid(retinoic acid) on DNA replication, H2B histone and DNA topoisopmerase I(Topo I) gene expression have been investigated in human promyelocytic leukemia cell line HL-60. DNA synthesis decreased at 24 hours after exposure of retinoic acid in the HL-60 cells. H2B histone mRNA rapidly reduced at 48 hours and Topo I and c-myc mRNA at 24 hours in retinoic acid-exposured HL-60 cells, respectively. The levels of c-myc, H2B histone and Topo I gene expression were reduced in proportion to the concentration of retinoic acid. The H2B histone mRNA in retinoic acid-exposured cells was elevated by cycloheximide treatment, while the level of Topo I mRNA was constant. These results suggest that regulations of H2B histone, c-myc and Topo I gene expression are different from one another, and repression of Topo I gene is closely correlated with c-myc gene during retinoic acid-induced differentiation of HL-60 cells.