线虫学研究中8种小工具的制作

 介绍了研究植物线虫的8种小工具的制作方法:用胶囊包装片作胞囊孵化窝,用塑料小杯或塑料瓶作线虫孵化网,用旧的小电动机和定时器安装自动喷雾装置,用快餐盒作浅盘分离器,用易拉罐作福尔马林蒸发器,用饮料盒培养杀线虫真菌,用饮料盒作育苗盒,用自行车辐条作解剖针。     

全因果通径模型中主要因素的决策方法

对于自变量之间呈因果关系的通径模型,分析了经典方法在决策主要因素时的优缺点;提出了比较总效应和总决定程度的新方法,并以实例进行了印证。     

武陵山区杂交水稻育种目标与策略初探

针对武陵山区气候生态条件复杂的特点,以市场为导向,结合多年育种实践,提出武陵山区杂交水稻育种目标:在以"优质高产多抗广适"为总体育种目标的基础上,以不育系和恢复系的米质和抗性选育为突破口,重点开展抗稻瘟病和耐寒育种,达到优质高产多抗广适的有机统一.实现该目标的主要策略是:充分发掘和利用优异种质资源,加强区内育种单位之间的协作,建立多病圃对种质资源、亲本和组合进行联合鉴定筛选,通过病区胁迫选择、非病区选择与高海拔基地抗寒性鉴定相结合育成符合育种目标的新组合.经过多年努力,成功地鉴定或育成了一批优质抗病的恢复系、不育系和杂交组合,并相继通过各级水稻品种审定.     

IDEF0方法在智能化小区系统设计中的应用

通过应用IDEF0系统功能模型设计方法对智能化小区系统进行设计,为完全基于“Everything Over IP”思想的网络化智能小区系统的设计提供了一个较成熟的智能化系统工程的设计思路。     

茶多酚和茶多糖清除羟基自由基的效果

[目的]研究茶多酚、茶多糖对羟基自由基(.OH)的清除效果,为茶叶的药理作用提供理论依据。[方法]采用Fenton法产生.OH使溴甲酚紫褪色的反应,在反应中加入一定剂量的茶多酚和茶多糖,测定它们清除.OH的效果,并同硫脲的作用进行比较。[结果]1.0mg/ml茶多酚在剂量0.4 ml时对.OH清除率最大,达到76.04%。1.0 mg/ml茶多糖在剂量0.5 ml时对.OH清除率最大,达到80.97%。0.1～0.3 ml 1.0 mg/ml茶多糖对.OH的清除率显著高于同剂量和浓度下的茶多酚(P<0.05或0.01),但剂量达到0.4 ml后,两者的作用无显著差异(P>0.05)。0.1 mg/ml硫脲在剂量0.6 ml时对.OH清除率最大,达到64.28%。[结论]茶多酚、茶多糖在体外对.OH有显著的清除作用,且在一定剂量范围内清除率与剂量呈线性关系,但茶多酚和茶多糖对.OH的清除率不及硫脲。     

不同抗旱措施在干旱半干旱地区公路绿化中的应用研究

干旱半干旱地区公路绿化时,幼树成活期间的水分供应很难满足,因而造成植树成活率低,见效慢。采用地膜、保水剂、生根粉几种抗旱措施,对馒头柳的土壤含水量、生长情况、叶绿素含量及成活率进行了比较试验。结果表明,这些措施均有一定的抗旱作用,其中保水剂效果最佳,其次为地膜,最后是生根粉。因此可以认为在干旱地区公路绿化,土壤含水量较低时,抗旱措施能保持幼树的稳定生长,提高公路绿化率。从经济角度考虑,树盘覆盖地膜成本低,是干旱地区公路绿化的最佳供水途径。     

A Computer Program for Automatic Watering Based on Potential Evapotranspiration by Penman Method and Predicted Leaf Area in Miniature Pot Rose Production

In this study, we developed a computer program for automatic prediction of watering time point by considering the environmental factors such as solar radiation, air temperature and relative humidity based on the multiple linear regression equation of leaf area and Penman Method. The experiments were carried out for a year in two watering experimental plots, one of which was controlled by pF value, and the other by the computer program. After comparing the results of the two plots, the following findings were obtained. In the computer program plot, the observed and predicted values of both leaf area and evapotranspiration indicated significant correlation at the 1% level, which suggested that the computer program had high prediction accuracy. In addition, no significant difference was observed between the two experimental plots with respects to the plant height, plant diameter, leaf area, leaf number, fresh weight, and dry weight, which demonstrated that the plants in the computer program plot had normal growth. On the other hand, although the number of flower buds and flowering shoots showed higher values at the end of certain cultivations in the computer program plot than those in pF value plot, we proposed that it was due to the effect of cumulative daily solar radiation in the greenhouse, rather than the watering. Thus, we have reached the conclusion that the computer program for automatic prediction of watering time point developed by this study has high applicability in miniature pot rose production.     

水样中氟化物的测定方法比较

研究了氟离子选择性电极法和氟试剂分光光度法测定水样中氟化物的差异,探讨了2种方法的优劣.结果表明:电极法标准曲线的相关性好于分光光度法;氟化物浓度为5～10mg/L时,2种方法准确度和精密度在0.05水平上无差异;电极法的回收率高于分光光度法;电极法的最低检出限为0.011 mg/L,分光光度法的最低检出限为0.037mg/L.     

基于AEZ法的庆阳土地承载力研究

基于AEZ法,从温饱、小康、富裕3个层次和热量、蛋白质、脂肪3个方面对庆阳市2001—2005年的土地资源承载力进行计算评价,虽然大部分县区的土地承载力呈上升趋势,人口压力值处于安全区间,但随着社会的发展,土地承载压力较大。     

墙体材料及其组合对日光温室墙体保温性能的影响

利用热反应系数法和日光温室热环境的数学模型模拟分析了日光温室墙体得热量、墙体温度以及室内气温,比较了墙体材料的不同组合对保温性能的影响。结果表明,对不同厚度砖墙聚苯板隔热材料的厚度以0.10m为宜;相同厚度隔热材料在砖墙厚度较薄时保温效果优于较厚的砖墙;砖墙厚度较薄时材料的排列秩序对保温影响较明显。