We perform an in-plane optical spectroscopy measurement on high quality Fe Se single crystals grown by a vapor transport technique. Below the structural transition at Ts 90 K, the reflectivity spectrum clearly shows a...We perform an in-plane optical spectroscopy measurement on high quality Fe Se single crystals grown by a vapor transport technique. Below the structural transition at Ts 90 K, the reflectivity spectrum clearly shows a gradual suppression around 400 cm 1and the conductivity spectrum shows a peak at higher frequency. The energy scale of this gap-like feature is comparable to the width of the band splitting observed by ARPES. The low-frequency conductivity consists of two Drude components and the overall plasma frequency is smaller than that of the Fe As based compounds, suggesting a lower carrier density or stronger correlation effect. The plasma frequency becomes even smaller below Tswhich agrees with the very small Fermi energy estimated by other experiments. Similar to iron pnictides, a clear temperature-induced spectral weight transfer is observed for Fe Se, being indicative of strong correlation effect.展开更多
A murine primary mammary tumor model was established to investigate the treatment with ginsenosides Rg3.The relationship between ginsenosides Rg3 and primary mammary tumor was explored.Mammary tumor was induced by usi...A murine primary mammary tumor model was established to investigate the treatment with ginsenosides Rg3.The relationship between ginsenosides Rg3 and primary mammary tumor was explored.Mammary tumor was induced by using the 7,12-dimethybenz(a)anthracene(DMBA).Ginsenoside Rg3 was employed for treatment.The incidence of mammary tumor in every group was compared,and the expressions of vascular endothelial growth factor(VEGF)and microvessel density(MVD)were detected by immunohistochemical method.The cell cycle and apoptosis percentage were determined by means offlow cytometry.The incidence of tumor in treatment group was significantly lower than that in control group(60.00%vs 33.33%,P<0.05).The average diameter of mammary tumor was(0.86�0.27)cm in control group and(0.39�0.09)cm in treatment group,with the difference being significant between control and treatment groups(P<0.01).The MVD value was(31.9�5.3)in control group and(20.1�4.9)in treatment group,respectively.There was a significant difference between the two groups(P<0.05).The apoptosis percentage in control group was significantly lower than that in treatment group[(2.47�0.69)%vs(5.67�0.99)%,P<0.05].Ginsenoside Rg3 can play an antitumor role in primary mammary tumor model by inhibiting angiogenesis,cell cycle progression,and promoting cell apoptosis.展开更多
基金supported by the National Natural Science Foundation of China(11120101003,11327806)the National Basic Research Program of China(2012CB821403)
文摘We perform an in-plane optical spectroscopy measurement on high quality Fe Se single crystals grown by a vapor transport technique. Below the structural transition at Ts 90 K, the reflectivity spectrum clearly shows a gradual suppression around 400 cm 1and the conductivity spectrum shows a peak at higher frequency. The energy scale of this gap-like feature is comparable to the width of the band splitting observed by ARPES. The low-frequency conductivity consists of two Drude components and the overall plasma frequency is smaller than that of the Fe As based compounds, suggesting a lower carrier density or stronger correlation effect. The plasma frequency becomes even smaller below Tswhich agrees with the very small Fermi energy estimated by other experiments. Similar to iron pnictides, a clear temperature-induced spectral weight transfer is observed for Fe Se, being indicative of strong correlation effect.
文摘A murine primary mammary tumor model was established to investigate the treatment with ginsenosides Rg3.The relationship between ginsenosides Rg3 and primary mammary tumor was explored.Mammary tumor was induced by using the 7,12-dimethybenz(a)anthracene(DMBA).Ginsenoside Rg3 was employed for treatment.The incidence of mammary tumor in every group was compared,and the expressions of vascular endothelial growth factor(VEGF)and microvessel density(MVD)were detected by immunohistochemical method.The cell cycle and apoptosis percentage were determined by means offlow cytometry.The incidence of tumor in treatment group was significantly lower than that in control group(60.00%vs 33.33%,P<0.05).The average diameter of mammary tumor was(0.86�0.27)cm in control group and(0.39�0.09)cm in treatment group,with the difference being significant between control and treatment groups(P<0.01).The MVD value was(31.9�5.3)in control group and(20.1�4.9)in treatment group,respectively.There was a significant difference between the two groups(P<0.05).The apoptosis percentage in control group was significantly lower than that in treatment group[(2.47�0.69)%vs(5.67�0.99)%,P<0.05].Ginsenoside Rg3 can play an antitumor role in primary mammary tumor model by inhibiting angiogenesis,cell cycle progression,and promoting cell apoptosis.
