桑叶的化学成分、药理活性及应用研究进展

目的：为合理开发利用桑叶资源提供依据。方法：采取查阅文献资料及实地考察相结合的方法。结果：桑叶中含N－糖化合物，芸香甙、，槲皮素，挥发油，氨基酸，维生素及微量元素等多种活化学成分，具有降血糖，降血脂，降血压，抗菌和抗病毒多种药理活性，结果：桑叶资源丰富，在药品和功能性食品领域研究开发前景广阔。     

阴香粉实病简况

本文简单介绍了阴香粉实病的症状、病原、发生规律和防治方法.     

百农AK58小麦光合特性的研究

在大田条件下,研究了百农AK58及温麦6号、新麦18号、周麦18号 4个小麦品种旗叶的光合作用特性.研究表明:百农AK58、温麦6号、新麦18号和周麦18号旗叶净光合速率/光合有效辐射的拟合系数分别为:0.91,0.59,0.43,0.79;最大净光合速率分别为:22.8μmol·m2·s-1,20.6μmol·m2·s-1,19.4μmol·m2·s-1,21.5μmol·m2·s-1;光补偿点分别为:75.9μmol/(m2·s),24.2μmol/(m2·s),76.9μmol/(m2·s),115.4μmol/(m2·s);CO2补偿点分别为:75.5 μmol/mol,43.7 μmol/mol,75.6 μmol/mol,81.5 μmol/mol.结果表明:百农AK58小麦品种具有较强的耐高温、强光特性和较好的光合生产潜力.     

对于娜拉出走意义的消解——论沉樱早期的小说创作

"娜拉出走"是五四时期独有的时代话语,并因其所蕴含的个性解放、女性解放的核心思想和意义.被赋予神圣伟大的地位.但经历了十年的风风雨雨之后,觉樱以她的作品在不经意中对其进行了解构,以其作品中女性人物的遭遇,深刻提示了娜拉出走的盲目性、脆弱性及不彻底性,表现了作者对于女性解放之路的独特思考,同时也展示了二三十年代一部分知识女性真实的生存状态.     

Does Chewing Coca Leaves Influence Physiology at High Altitude?

Andean Indians have used coca leaves (Erythroxylon coca and related species) for centuries to enhance physical performance. The benefits and disadvantages of using coca leaf have been a subject of many political debates. The aim of this study was to investigate the effects of chewing coca leaves on biochemical and physiological parameters. Cutaneous microdialysis catheters were used to estimate systemic biochemical changes. We subjected 10 healthy adult males (local residents) in Cajamarca (Peru, altitude 2700 m) to a standardised exercise routine on a stationary cycle ergometer. The blood pressure, oxygen saturation (digital), pulse, VO2 max and ECG (Holter monitor) were recorded before the exercise. Cutaneous microdialysis catheters were introduced in the forearm. The subjects were given to chew 8 g of coca leaves with a small amount of lime. They were then placed on the cycle ergometer for 20 min. Blood pressure, oxygen saturation, pulse, ECG and VO2 max were recorded. Pyruvate, glucose, lactate, glycerol and glutamate levels were estimated. Oxygen saturation, blood pressure, and pulse rate did not show any significant changes between the two groups. Glucose levels showed hyperglycaemic response. Glycerol, Lactate and Pyruvate increased. Glutamate remained unchanged. Similar changes were not seen in the controls. These results suggest that coca leaves have blocked the glycolytic pathway of glucose oxidation resulting in accumulation of glucose and pyruvate. The energy requirement for exercise is being met with beta-oxidation of fatty acids. The glycerol released was also getting accumulated since its pathway for oxidation was blocked. These experimental findings suggest that chewing coca leaves is beneficial during exercise and that the effects are felt over a prolonged period of sustained physical activity.     

植物体内硫含量的测定

通过测定植物叶片中硫的含量可监测空气中SO2的浓度。简述了用氧瓶燃烧——硫酸钡比浊法测定植物叶片中硫含量的实验方法。通过测定标准系列溶液和试样溶液的吸光度,绘制标准曲线,用内插法在标准曲线上求得样品中硫的含量。     

利用原子吸收光度法测定树叶中的重金属

用浓硝酸与高氯酸消解树叶，Cu、Zn及Mn含量较高，可直接用火焰原子吸收法测定。含量较低的Pb、Cd及Cr则用石墨炉法测定。Pb及Cd含量甚微，受基体及共存元素干扰严重，用标准加入法可消除干扰，结果令人满意。     

竹叶总黄酮提取工艺研究

探讨用醇提法提取竹叶中黄酮类成分的最佳工艺,为竹叶的开发利用提供理论依据。以竹叶为试材,以乙醇为溶剂,采用分光光度法对竹叶中的黄酮类化合物的含量进行测试。通过单因素实验研究乙醇浓度、料液比、提取温度、提取时间对总黄酮提取率的影响,再采用正交试验法优化提取总黄酮的最佳工艺条件。单因素实验和正交试验表明:影响黄酮提取率的因素主次顺序是:料液比>乙醇浓度>提取温度>提取时间。最佳实验条件为料液比1:20,60%的乙醇,60℃提取4h,竹叶中黄酮的含量为7.88mg.g-1。     

烤烟散叶收购在工商交接环节的主要问题及其解决途径初探

随着烤烟收购模式的转变,工商交接方式也应与之相适应.就烤烟散叶收购在工商交接环节的主要问题进行了剖析,对与之相匹配的工商交接方式进行了深入的探讨,为烤烟散叶收购工商交接得以顺畅运行提供参考.     

用核分析法评估环境污染Ⅰ.测定植物和土壤中氟含量

1　Ｉｎｔｒｏｄｕｃｔｉｏｎ　Ｏｖｅｒｅｘｐａｎｓｉｏｎｏｆｉｎｄｕｓｔｒｉｅｓｈａｓｃａｕｓｅｄｄｅｇｒａｄａｔｉｏｎｏｆｅｎｖｉｒｏｎｍｅｎｔａｌｑｕａｌｉｔｙｅｓｐｅｃｉａｌｌｙｉｎｔｈｅｄｅｖｅｌｏｐｅｄｃｏｕｎ ｔｒｉｅｓ.Ｏｚｏｎｅｄｅｐｌｅｔｉｏｎｈａｓｓｐｕｒｒｅｄｗｏｒｌｄｗｉｄｅｅｎｖｉｒｏｎ ｍｅｎｔａｌｃｏｎｔｒｏｌ.　Ｆｏｒａｍｂｉｅｎｔａｔｍｏｓｐｈｅｒｅ,ｔｈｅｒｅｇｕｌａｔｏｒｙａｕｔｈｏｒｉｔｉｅｓｉｎＣｈｉｎａｄｅｍａｎｄａｌｌｉｎｄｕｓｔｒｉｅｓｔｏｉｍｐｌｅｍｅ…