We had given evidences of cytocidal effect in vitro of either parvovirus H-I(PV H-1) or AT-1840 (lycobetaine) on gastric cancer cells. They act on different phase of the cell cycle of the gastric cancer cells, with PV...We had given evidences of cytocidal effect in vitro of either parvovirus H-I(PV H-1) or AT-1840 (lycobetaine) on gastric cancer cells. They act on different phase of the cell cycle of the gastric cancer cells, with PV H-1 on the late stage of S phase and AT-1840 on M phase. Combined use of these drugs gives better killing effect than the individual drug alone. In gastric cancer-bearing nude mice (ascites and solid tumor forms), both AT-1840 and PV H-1 increased the survival peroids and decreased the size of solid tumors. Depsite these are the experimental study which may not to be the same in human being. However, the study has layed down a solid foundation for our further exploration of these two substances as anti-gastric cancer drugs in the future.展开更多
The present paper employed density function theory to investigate two reaction pathways for isomerization of enol ester proposed by Yang(path a) and the present authors(path a), respectively. The base catalytic effect...The present paper employed density function theory to investigate two reaction pathways for isomerization of enol ester proposed by Yang(path a) and the present authors(path a), respectively. The base catalytic effects of solvent triethylamine on these two reactions were also evaluated. It is demonstrated that path B is more preferable than path a due to low barrier height for the rate-determining step.展开更多
建立食用醋中乙酸含量的快速定量分析方法。采用核磁共振氢谱(^(1)H nuclear magnetic resonance,^(1)H NMR),对多种食用醋进行了测定。核磁共振氢谱(^(1)H-NMR)测定参数为:温度25℃,谱宽2~14ppm,脉冲角度45度,脉冲延迟时间3s,采样时间...建立食用醋中乙酸含量的快速定量分析方法。采用核磁共振氢谱(^(1)H nuclear magnetic resonance,^(1)H NMR),对多种食用醋进行了测定。核磁共振氢谱(^(1)H-NMR)测定参数为:温度25℃,谱宽2~14ppm,脉冲角度45度,脉冲延迟时间3s,采样时间2s,扫描次数16次。实验结果表明,在优化的测试条件下,目标物与内标物定量特征峰面积比1∶3~4∶1范围内,该方法表现出良好的线性关系,线性回归方程为Y=-0.01996+0.01732X(R=0.9999);精密度和重复性实验相对标准偏差(RSD)分别为0.059%和0.249%;样品加标回收率为97.8%~101.4%,平均偏差0.9%。该方法样品需求量小,结果稳定可靠,是一种简便、快捷的食用醋中乙酸含量的检测方法。展开更多
文摘We had given evidences of cytocidal effect in vitro of either parvovirus H-I(PV H-1) or AT-1840 (lycobetaine) on gastric cancer cells. They act on different phase of the cell cycle of the gastric cancer cells, with PV H-1 on the late stage of S phase and AT-1840 on M phase. Combined use of these drugs gives better killing effect than the individual drug alone. In gastric cancer-bearing nude mice (ascites and solid tumor forms), both AT-1840 and PV H-1 increased the survival peroids and decreased the size of solid tumors. Depsite these are the experimental study which may not to be the same in human being. However, the study has layed down a solid foundation for our further exploration of these two substances as anti-gastric cancer drugs in the future.
文摘The present paper employed density function theory to investigate two reaction pathways for isomerization of enol ester proposed by Yang(path a) and the present authors(path a), respectively. The base catalytic effects of solvent triethylamine on these two reactions were also evaluated. It is demonstrated that path B is more preferable than path a due to low barrier height for the rate-determining step.
文摘建立食用醋中乙酸含量的快速定量分析方法。采用核磁共振氢谱(^(1)H nuclear magnetic resonance,^(1)H NMR),对多种食用醋进行了测定。核磁共振氢谱(^(1)H-NMR)测定参数为:温度25℃,谱宽2~14ppm,脉冲角度45度,脉冲延迟时间3s,采样时间2s,扫描次数16次。实验结果表明,在优化的测试条件下,目标物与内标物定量特征峰面积比1∶3~4∶1范围内,该方法表现出良好的线性关系,线性回归方程为Y=-0.01996+0.01732X(R=0.9999);精密度和重复性实验相对标准偏差(RSD)分别为0.059%和0.249%;样品加标回收率为97.8%~101.4%,平均偏差0.9%。该方法样品需求量小,结果稳定可靠,是一种简便、快捷的食用醋中乙酸含量的检测方法。
