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週期的 高蛋白質 給食에 依한 白鼠의 營養效果에 關한 硏究
朴容周,黃祐翊 우석대학교 의과대학 1969 우석의대잡지 Vol.6 No.2
This study was done in order to observe the nutritional effect of the rice diet supplemented with fish flour every one to four days. The protein, lipid and cholesterol contents in liver, serum protein and cholesterol values and hemoglobin and hematocrit values were measured. The animals used for the experiment were adult female albino rats from a pure strain, weighing 239-297g. The animals were divided into five diet groups: the standard diet (control group), the rice diet supplemented with fish flour once every other day group (A group), every two days (B group), every three days (C group) and every four days (D group). Each animal group was redivided into four groups by the length of feeding of each diet; the feeding groups were for fifteen days, thirty days, forty-five days and sixty days. The results obtained are summarized as follows: 1. The protein contents in the livr of the A and the B groups were similar to the value of the control. After feeding of this diet for fourty-five days they were slightly decreased, and those of the C and the D groups were generally decreased, compared with the control group. 2. The protein values in the serum showed no maked change compared with the control group and showed no change with either the type of diet or length of time this diet was given. 3. The lipid contents in the liver of the A and the B groups were increased, compared with the control group, up to thirty days but after forty-five days they were decreased. Those of the C and the D groups were usually increased, compared with the control group regardless of the length of feeding. 4. The cholesterol contents in the liver of each diet group were slightly decreased, compared with the control group for the duration of the study. 5. The hemoglobin and hematocrit values of each diet group (except the A group) were slightly decreased at fifteen days after the feeding of each diet. From the above results it is suggested that the nutritional effect of the low protein diet was most improved by a fish flour supplement given once every other day. It seems likely that shorter the interval of the periodical supplement, greater the nutritional effect.
Chemopreventive effects of Ginkgo biloba extract in estrogen-negative human breast cancer cells
박용주,Mi Jie Kim,김하룡,Min Sun Yi,정규혁,오승민 대한약학회 2013 Archives of Pharmacal Research Vol.36 No.1
Excessive level of estrogen is considered as amain cause of breast cancer, therefore, many studies havefocused on estrogen receptor (ER)-positive breast cancer,even though ER-negative cancer has a poor prognosis thanER-positive breast cancer. We evaluated the anti-cancereffects of Ginkgo biloba extract (GBE) in estrogen-independentbreast cancer. GBE has been traditionally used as aplatelet activating factor, a circulatory stimulant, a tonic,and anti-asthmatic drug, and anti-cancer agent. However,anti-cancer effects of GBE on ER-negative breast cancerhave not been proved yet. In this study, we tested chemotherapeuticpotential of GBE in the MDA-MB-231 (ERnegative)human breast cancer cell line. Our resultsshowed that cytotoxicity effects of GBE in MDA-MB-231lead to DNA fragmentation at high concentrations (500 and1,000 lg/ml). Caspase-3 was significantly activated andmRNA levels of apoptosis-related genes (Bcl-2 and Bax)were altered. These results indicate that GBE inducesapoptosis in MDA-MB-231 cells. It is presumed that GBEhas chemopreventive effects in ER-independent breastcancer through anti-proliferation and apoptosis-inducingactivities.
자기조직화에 의한 InAs 양자점 구조 형성에 미치는 수소플라즈마의 효과
박용주,김은규,민석기 한국결정성장학회 1996 韓國結晶成長學會誌 Vol.6 No.3
ECR (electron cyclotron resonance) 플라즈마원이 장착되어 있는 화학선에피탁시 (chemical beam epitaxy : CBE) 장치를 사용하여 InAs 양자점 구조형성에 미치는 수소플라즈마의 효과에 대하여 조사하였다. 자기조직화(self-organized)에 의해 GaAs 기판위에서 InAs 양자점의 형성을 RHEED(reflection high energy electron diffraction)로 관측한 결과 수소가스 및 수소플라즈마의 영향을 받지 않은 상태에서는 1.9 ML(monolayer)의 InAs 층성장(layer growth) 후에 형성되는데 비해 수소플아즈마를 조사한 상태에서는 약 2.6 ML의 InAs 층성장(layer growth) 후에 형성되는데 비해 수소플아즈마를 조사한 상태에서는 약 2.6 ML의 InAs층이 성장된 후 뒤늦게 이루어짐을 확인하였다. 기판의 온도 $370^{\circ}C$에서 동일한 조건으로 형성시킨 InAs 양자점의 밀도 및 크기는 수소플라즈마의 영향을 받지 않은 경우 $1.9{\times}10^{11}cm^{-2}$ 및 17.7 nm에서 수소플라즈마를 쪼인 경우 $1.3{\times}10^{11}cm^{-2}$ 및 19.4 nm로 양자점 형성 다소 완화되는 것으로 나타났다. 또한, 수소플아즈마에 의한 InAs 양자점의 PL(photoluminescence) 신호의 적색이동(red shift)과 반치폭 증가로부터 양자점 크기의 증가와 균일성이 다소 감소되는 모습을 알 수 있었다. 이와같은 수소플라즈마의 영향은 GaAs 기판과 InAs 사이의 부정합 변형환화 효과에의해 InAs의 충성장을 강화시키는 원자상 수소의 작용때문인 것으로 고려되었다. We have investigated the effect of hydrogen plasma on the formation of InAs QDs (quantum dots) structure by using a CBE (chemical beam epitaxy)system equipped with ECR (electron cyclotron resonance) plasma source. It is confirmed that the formation of self-organized InAs-QDs on GaAs is started after the growth of InAs layer up to 2.6 ML (monolayer) with the irradiation of hydrogen plasma while it is started after 1.9 ML without hydrogen gas and hydrogen plasma through the observation of RHEED patterns. Density and size of the QDs formed at $T_{sub}=370^{\circ}C$ are $1.9{\times}10^{11}cm^{-2}$ and 17.7 nm without hydrogen plasma, and $1.3{\times}10^{11}cm^{-2}$ and 19.4 nm with hydrogen plasma, respectively. It is also observed from the PL(photoluminescence) measurement on InAs-QDs that red shift in PL peak energy and broadening in FWHM (full width at half maximum)of PL peak caused by the effects of hydrogen plasma on the increment of size and its distribution. These effects of hydrogen plasma are considered as a act of atomic hydrogen which enhances the layer-growth of InAs on GaAs resulted from the relief of misfit strain between GaAs substrate and InAs.