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An Improved Synthesis of Methyl p-Hydroxyphenylalkanoates
Choi, Hong Dae,Kowak, Yong Sil,Geum, Dek Hyun,Son, Byeng Wha 동의대학교 기초과학연구소 1995 基礎科學硏究論文集 Vol.5 No.1
Friedel-Crafts reaction of isopropoxybenzene with methly α-chloro-α-(methylthio)acetate 1 afforded methyl α-methylthio-p-isopropoxyphenylacetate 2d, which was readily converted into methyl p-isopropoxyphenylacetate 3 by reductive desulfurization with zinc dust in acetic acid. Methylation of 3 with sodium hydride and methyl iodide gave methyl α-(p-isopropoxyphenyl)propionate 5. Methyl p-hydroxyphenylalkanoates (4,6), useful intermediates for some medicines, were easily prepared by treatment of 3 and 5 with titanium tetrachloride, respectively.
Synechococcus PCC7002의 세포 및 틸라코이드 막의 Polyvinylalcohol 고정화에 의한 광합성 특성
윤지은,전현식,이혜주,엄경일,선우양일,박인호,이진범 동의대학교 기초과학연구소 1994 基礎科學硏究論文集 Vol.4 No.1
Highly stable O₂-evolving cells and thylakoid membranes have been obtained from the cyanobacterium, Synechococcus PCC7002, by immobilization with polyvinylalcohol(PVA). The absorption peak showed the blue-shift to about 3 nm after immobilization of intact cells and thylakoid membranes as well as isolation of thylakoid membranes. Photosynthetic electron transport activities, especially PS Ⅱ activity showed greater stability in the PVA-immobilized cells and thylakoid membranes when stored at 4℃ than in those at 25℃. When the cells were threated at higher temperature, the level of Fo and Fv increased. After immobilization, however, Fo showed no changed. This suggests that the immobilization can protect against the damages of PS Ⅱ complex, especially a water-spiliting system, by heat treatment.
홍조 꼬시래기(Gracilaria verrucosa) 유래의 글리세로당 Floridoside의 화학구조
盧連淑,孫炳華,任光植,崔洪大 동의대학교 기초과학연구소 1995 基礎科學硏究論文集 Vol.5 No.1
As part of search for new biologically active substances from marine organism, we have isolated a glyecrol glycoside from the marine red alga Gracilaria verrucosa. The structure of the glycerol glycoside was elucidated as 2-O-α-_D-galactopyranosylglycerol〔floridoside(4)〕 on the basis of spectroscopic and physicochemical evidences.
한순이,김기동,박상태,이대원,정운혁,이종환 동의대학교 기초과학연구소 1996 基礎科學硏究論文集 Vol.6 No.1
We have used the group SU(3) to explain the rotational spectrum of ^24Mg and to calculate the electromagnetic transition ratios between the rotational levels of ^24Mg. The harmonic oscillator potential was used as the average potential, and Hamiltonian was written in terms of the casimir operators of the subgroup chain of the group U(6). As a residual interaction, the symmetry conserving and the degeneracy removing operator X was added. The low-lying levels of ^24Mg appear to be described well by the states belonging to the SU(3) rep. The calculations reproduce the well-known rotational structures with the K=0 and the K=2 bands, and electromagnetic transition rates between the 0^+ -2^+ -4^+ levels were well explained in those bands, assuming an E2 transition.
Cho, Yong Jin,Son, Byeng Wha,Choi, Hong Dae 동의대학교 기초과학연구소 1996 基礎科學硏究論文集 Vol.6 No.1
The metabolites of marine mollusk Mytilus edulis were isolated and characterized, revealing the presence of the rare free fatty acids and proteinogenic amino acids together with a non-proteinogenic free amino acid, taurine. The free fatty acids in this organism were particularly interesting for the presence of both unusual n-6 acid [20:4(n-6)] and triple bond containing aced (2,5-octadecadiynoic acid). In addition to the proteinogenic amino acids commonly found in proteins, non-proteinogenic free amino acid taurine was isolated and the structure was determined by its physicochemical properties. Recently taurine has been given much interest in the molecular level because of diverse biological activities and the medicinal properties. Furthermore, the result of the analyses of free amino acids showed that glycine, glutamic acid, serine and alanine, which were considered to be related to the taste of this organism, are predominantly present.
CHO, Chae-Ryong,SHI, Erwei,JANG, Min-Su,JEONG, Se-Young,KIM, Seong-Chul 동의대학교 기초과학연구소 1995 基礎科學硏究論文集 Vol.5 No.1
Crack-free dense, polycrystalline BaTiO₃ thin films have been synthesized on the Ti-deposited Si(100) substrates with various alkaline solutions of barium salts in the temperature range from 150℃ to 280℃ by hydrothermal method. The fabricated BaTiO₃ thin films were found to have good adhesion on the substrate. The structural properties of thin films were investigated by X-ray diffraction (XRD) measurements. It was discussed about the crystallinity, surface morphology and interfaces of the resultant films depending on the reaction conditions such as time, temperature and solution. The thickness of the films increased with increasing temperature and time of reaction. The dielectric constants and the loss factor of thin film were measured in the frequency range from 100㎐ to 1㎒ at room temperature.
李福奎,權晉洙 동의대학교 기초과학연구소 1994 基礎科學硏究論文集 Vol.4 No.1
Ion concentrations and osmolalities of the body fluid and oxygen consumption of the larvae of the freshwater crab, under the influence of various salinities and water temperatures were studied. The level of Na^+ and Cl^- ions in the body fluid of the crab placed in the low salinities (freshwater and 30% seawater) were higher at the low temperature(16℃) than high temperature (30℃). However, the crab in the high salinity (90% seawater), those ions in the body fluid were higher at the high temperature (30℃) than the low temperature (10℃). When the zoea larvae were young (first and second stages), the ion concentrations of the body fluid were more affected by salinities and temperatures of the media. The salinity levels of the media more influenced the levels of K^+ ions of the body fluid of the larvae than the temperature. The osmolalities of the body fluid of the larvae was almost isotonic when they were place at 70% seawater (24.5‰). Oxygen consumption of individual larva was lower in zoea 1 and 2 stages than the other stage larvae. The high oxygen consumption of the larvae was observed at 70% seawater compared to the other salinity levels.
Effect of Plant Hormones on the Invertase Activity in the Senescing Leaves of Phaseolus radiatus
Lee, Chin Bum,Lee, Dong Hee,Kim, Young Sang 동의대학교 기초과학연구소 1999 基礎科學硏究論文集 Vol.9 No.1
Effect of plant hormones on the leaf senescence of mung bean (Phaseolus radiatus) was investigated by measuring the changes of reducing sugar contents and invertase isozyme activities in detached leaves treated with NAA, GA₃ or BA. During dark-induced senescence, reducing sugar contents in the detached leaves increased temporarily at 4 d, thereafter decreased rapidly and reached minimum values within 7-14 d. The pattern of soluble acid invertase activity in the senescing leaves kept in the dark was similar to that of reducing sugar accumulation, whereas the activities of alkaline and extracellular invertases were not significantly changed during leaf senescence. Therefore, these results suggest that soluble acid invertase, but not alkaline and extracellular invertases, induces the accumulation of reducing sugar during leaf senescence of mung bean plants. Exogenous NAA application had little or no effect in the increase of soluble acid invertase activity during dark-induced senescence compared to the control. However, exogenous applications of GA₃ and BA led to the increase of soluble acid invertase activity in the senescing leaves. Particularly, BA application was very effective in enhancing the activity of soluble acid invertase as well as in delaying chlorophyll breakdown during dark-induced senescence. These results suggest, therefore, that BA regulates the activity of soluble acid invertase, which leads to the accumulation of reducing sugar, and the stability of photosynthetic apparatus to delay leaf senescence.
대게 Chionoecetes opilio (O. Fabricius)의 난발생 및 부화 유생의 형태
이복규,임영수,이종관,허성범 동의대학교 기초과학연구소 1999 基礎科學硏究論文集 Vol.9 No.1
This paper documented mophological changes of embryonic development and first zoea larvae of snow crab, Chionoecetes opilio. Female crabs were sampled by the Danish seine fishery at the depth about 200m in Sep. 1997 in the eastern coast of Korea. Female with newly berried eggs was reared at the water temperature of 5℃ till the time of hatching. The results obtained are as follows. Embryonic development : According to morphogenesis of fertilized eggs, the developmental process of the embryo was classified into the following seven stages : First stage (cleavage and blastula stage, 24 days) Second stage (gastrula stage, 72 days) Third stage (nauplius stage, 22 days) Fourth stage (metanauplius stage, 57 days) Fifth stage (stage of a pigmentary deposit in the compound eye, 30 days) Sixth stage (chromatophore appearance stage in maxillipede, 56 days) Seventh stage (hatching stage, 36 days) Larvae hatched as prezoeas and they molted to first zoea in about an hour. The first zoea is 4.6 to 5.1 ㎜ in length, 3.2∼3.6 ㎜ in width. The abdomen consists of five segments and a bifurcate telson.