IAA对黄瓜花粉管伸长及花粉内源cAMP含量的影响

研究不同浓度的ＩＡＡ对黄瓜花粉管伸长及内源ｃＡＭＰ含量的影响。结果表明：５ｍｇ／ＬＩＡＡ明显促进花粉管伸长，而１００ｍｇ／ＬＩＡＡ则完全抑制花粉萌发。     

四川老鹳草属植物的花粉形态及其系统学意义

用光学显微镜和扫描电镜对分布在四川的８组３０种老鹳草属植物进行了花粉形态观察，并结合植物的外部形态特征研究了它们的一些系统学意义。     

宁夏枸杞花粉形态的扫描电镜观察

首次报道了宁夏枸杞３个品种、一个变种的花粉在扫描电镜下的形态特征．结果表明：供试花粉均为小花粉类型，椭圆形，或近球形，三孔沟，等极，表面有夹带二岐分叉的条状纹饰作纵向排列．具不同条状纹饰和条纹表面的不规则细横纹是供试花粉的区别点．花粉的大小和形状，在供试各品种之间也有不同程度的差异     

参麦注射液对糖尿病合并心力衰竭患者的疗效及心率变异率的影响

目的观察参麦注射液辅助治疗糖尿病合并心力衰竭的疗效,并观察其对患者心率变异率的影响。方法选取糖尿病心衰患者101例,随机分成2组。对照组50例予常规降糖、强心、利尿、扩血管治疗；治疗组51例在对照组治疗基础上加参麦注射液40～60ml于5%葡萄糖250ml中静滴,1次/d,14d为1疗程。观察两组总有效率及心率变异率的影响。结果两组总有效率分别为88.2%和68%,治疗组疗效优于对照组(P＜0.05),参麦治疗组心率变异率明显升高。结论参麦注射液辅助治疗糖尿病合并心衰疗效显著,能改善心率变异率,无明显不良反应。     

Seasonal variation of snow microbial community structure in the East Rongbuk glacier, Mt. Everest

Mt. Everest, the zenith of the world, plays an impor- tant role in the global climate change. During the lastdecade, some studies on glacier and snow have been undertaken in this region. The climate and environment changes in the past hundred years have b…     

Response of downstream sediment to water resource development in mainstream of the Lancang River

The impact of hydropower cascades of the Lancang River on downstream sedimentation has become one of the key problems in the research of the transboundary water resource development and its possible environmental effects. In this paper, the newest sediment data series spanning 17 years （1987-2003） at Yunjinghong hydrometric station and Chiang Saen hydrometric station, in northern Thailand, are analyzed to reveal these effects. Monthly mean sediment concentration data of the two stations are compared in-phase and yearly series are analyzed by the method of correlation and regression analysis and causality test. The analysis result shows that, though both of them are located at lower reaches of Manwan and Dachaoshan hydropower stations which are already constructed and in use, the sediment responses of the two stations are different under the regulation of the hydropower stations Annual series at Yunjinghong station are positively correlated but do not match well with those at Chiang Saen station. In addition, the results of Granger causality test on the time series also suggest that the series of maximum monthly mean sediment concentration of the Yunjinghong station each year may give cause for the ones of Chiang Saen station, while the series of minimum monthly mean sediment concentration each year and annual mean sediment concentration of Yunjinghong do not evidently give cause for the ones of the other station. Undoubtedly, this discovery will provide new evidences to assess the impacts of cascades construction in mainstream of the Lancang River on the variation of downstream sediment and its transboundary effects.     

Variability of surface circulation in the South China Sea from satellite altimeter data

11-year satellite altimeter sea surface height （SSH） anomaly data from January 1993 to December 2003 are used to present the dominant spatial patterns and temporal variations of the South China Sea （SCS） surface circulation through Empirical Orthogonal Function （EOF） analysis. The first three EOF modes show the obvious seasonal variations of SSH in the SCS. EOF mode one is generally characterized by a basin-wide circulation. Mode two describes the double-cell basin scale circulation structure. The two cells were located off west of the Luzon Island and southeast of Vietnam, respectively. EOF mode three presents the mesoscale eddy structure in the western SCS, which develops into a strong cyclonic eddy rapidly from July to September. EOF mode one and mode three are also embedded with interannual signals, indicating that the SCS surface circulation variation is influenced by El Nino events prominently. The strong El Nino of 1997/98 obviously changed the SCS circulation structure. This study also shows that there existed a series of mesoscale eddies in the western SCS, and their temporal variation indicates intra-seasonal and interannual signals.     

山东毛茛属植物的花粉形态研究

利用扫描电子显微镜对山东毛茛属（Ranunculus L．）3种植物的花粉形态进行了观察和研究．结果显示该属花粉为长球形，具3沟，外壁具颗粒状刺雕纹．本属花粉粒形状、大小和外壁雕纹的细微结构可以作为种间分类的依据．     

六种沙蒿花粉形态的比较研究

通过光学显微镜和扫描电镜．观察了蒿属6种沙生半灌木的花粉形态．结果表明，6种沙蒿的花粉形态高度一致,极面观均为三裂圆形，赤道面观为圆形或椭圆形，具三孔沟，外壁纹饰在光镜下为表面颗粒状，在电镜下为排列较疏的刺，刺基外延．     

基于改进遗传算法的前向神经网络

针对遗传算法的主要算子———交叉算子 ,设计了新的交叉算子 ,使个体尽可能地分散在整个解空间 .在具体交叉操作中 ,产生随机个体参与交叉以更好地搜索新的解空间 .并提出了组合变异策略 ,假如对变异后个体隔代保护策略 ,构造了一个有效的改进遗传算法 .利用该改进遗传算法 ,构造了前向进化神经网络 .它综合了改进遗传算法优良的全局寻优性能和前向神经网络的非线性映射能力 .