西北印度洋丝尾红钻鱼耳石生长形态学的初步研究

根据2005年10月至2006年1月在印度洋公海撒雅德玛哈浅滩(Saya de Malha Bank)进行底层渔业资源调查期间,随机采集的208尾丝尾红钻鱼Etelis coruscans(叉长383~866 mm)样本,进行了耳石质量(WO)及其耳石长(长轴,OTL)、耳石宽(短轴,OW)、背长(ODL)、背高(DH)、背喙长(DRL)和腹喙长(VRL)等形态指标参数的测定,初步研究了该种群耳石形态指标的生长特征。结果表明:丝尾红钻鱼左右矢耳石的长度和质量均无显著性差异或一致性偏差(P0.05),耳石呈缺刻卵圆形,凸面有沟裂,凹面核心区表面平坦;背部和腹部边缘有不规则的齿轮缺刻;腹喙比背喙长且粗壮;耳石长轴(OTL)为9.85~20.76 mm,短轴(OW)为5.03~10.88 mm;叉长540 mm时,耳石形态长度指标(OTL、ODL、VRL)相对尺寸变化较大,而宽度指标(OW、DH)相对尺寸变化较小;叉长540 mm时,耳石形态长度指标(OTL、ODL)相对尺寸变化趋势不稳定,而宽度指标相对尺寸变化趋势平缓;整个生长过程中,耳石短轴生长比其长轴生长稳定,短轴与耳石质量的回归关系最高,并且与鱼体叉长的关系基本符合正相关关系。因此,丝尾红钻鱼的耳石短轴更适合用于耳石形态生长与耳石质量及鱼体生长关系的研究。     

Control of rabies: epidemiology of rabies in Asia and development of new-generation vaccines for rabies

Rabies is an enzootic viral disease widespread throughout the world. Although it is a vaccine-preventable disease, the annual number of human deaths caused by rabies is estimated to be 32,000 in Asia. Phylogenetic analysis based on sequence data of the partial N gene of rabies viruses in Asia has shown that the viruses are divided into five genogroups, distributed in Middle East, South Asia, South East Asia, Malay, and Arctic regions. The genetic relationships among these rabies viruses agree basically with the results of previous studies. Meanwhile, new types of vaccines are being developed by applying gene manipulation techniques to rabies virus in order to overcome the disadvantages of current vaccines. This article reviews the molecular epidemiology of rabies in Asia and progress made in the development of new-generation rabies vaccines with the goal of elimination or control of rabies in Asia.     

Chemistry of immunomodulators

A large number of synthetic derivatives, inorganic compounds or naturally occurring substances are able to depress, regulate or enhance the immune response. Immunomodulators, among which some are chemically well defined and others are complex preparations, exhibit a great variety of chemical structures which are briefly reviewed, without details on their immunopharmacological properties. These molecules allow access to a new type of therapy which aims at acting on the host defense mechanisms.     

喀斯特山区退耕还林（草）保持水土生态效益研究

通过3年定位、半定位观测,对贵州山区退耕还林(草)地进行采样并采用无界径流小区法收集地表径流样品,探讨贵州山区退耕还林(草)措施对贵州山区土壤养分流失以及水土保持效益的影响。试验结果表明:退耕还林(草)后旱坡地地表径流中泥沙含量降低,土壤养分流失减少,土壤容重降低,土壤理化性质改善。尤其是旱坡陡耕地,可以明显降低土壤侵蚀。     

A new parameter for evaluating waveform distortion of partial discharge signals after de noising

The alternating detail parameter (ADP) is a new parameter to represent waveform micro distortion. It is proposed to overcome the shortcomings of the traditional evaluation parameters, the normalized correlation coefficient (NCC) and the variation trend parameter. This proposal is based on the principle that two discrete waveforms are more similar if the ratio of their corresponding differentials is close to one. ADP is shown to be correct by power spectrum analysis. Simulation research demonstrated that ADP is valid for evaluating the effect on the de noised partial discharge signal by associating NCC with signal noise ratio.     

德摩根商拓扑代数的拓扑性质

探讨了德摩根商拓扑代数的连通性，可分性等一些拓扑性质，并建立了德摩根商拓扑代数为Ｔ１的一个充分必要条件。     

植物细胞的分化与脱分化

细胞分化与脱分化是现代生物学的基本问题之一。综述了植物细胞分化、脱分化过程中的形态结构变化及其调控。结果表明：从形态结构水平很难找出标志细胞分化与脱分化的特征规律。激素被证明对细胞分化与脱分化的调控起作用。生长素与细胞分裂素的作用受到普遍的关注。参18。     

毛竹笋用林地下竹鞭分布规律与竹笋个体发育的关系

毛竹笋用林地下竹鞭分布有一定的规律。对粗放、集约两类型竹林进行调查,结果表明:竹笋发育由浅层到深层递进,清明前发笋竹鞭适宜深度在土壤表层,清明后逐渐移向土壤下层。竹笋发育数量,以中层为最多,深层为最少;竹笋个体重,随竹鞭分布深度增加而逐步增大。但约在35cm以下竹鞭孕笋逐步减少,而竹笋深度增重率增大,两者过渡最佳交点,出现在鞭深35cm左右的地方。     

响应面法优化超声波辅助提取山药 低聚糖的工艺研究

为了得到超声波辅助提取山药低聚糖的最佳工艺条件、采用 Box 窑 Benhnken 中心组合设计及响应面法 （RSM ）探讨了超声功率、超声时间、乙醇浓度、料液比 4个因素的优化组合。 经回归模型分析并结合验证试验、确定 低聚糖的最佳提取工艺条件为：超声功率 500 W 、提取时间 60 mi n、乙醇浓度 60% 、料液比 1: 15。 在该条件下、山药低 聚糖得率为 7. 21( 依0. 26) % , 与预测值 7. 25% 基本一致、且比相同条件下未使用超声波的提取工艺提高了 3. 91% 。     

Effects of K-Mg ratio on growth and cation nutrition of Vitis vinifera L. cv. “Dattier de Beiruth” grafted on SO4 rootstock

The area of planting of Vitis vinifera L. cv. “Dattier de Beiruth” (DB) grafted on the SO4 (Selection OPPENHEIM 4) rootstock is significant and constantly growing in Northern Algeria. A hydroponic culture was carried out with DB to investigate the effects of potassium-magnesium (K-Mg) ratio on plant growth and mineral nutrition. Four nutrient solutions were tested on which the K-Mg ratio is variable (nutritive solution (NS)1 = 0.3 K: 3.8 Mg, NS2 = 2.1 K: 2 Mg, NS3 = 2.6 K: 1.5 Mg and NS4 = 3.8 K: 0.3 Mg). The results showed that DB was characterized by a high capacity for K uptake. No significant differences among the treatments were detected in the leaf concentrations of calcium (Ca), however Mg uptake was inhibited by increase of K: Mg in the nutrient solution. Results showed that DB is sensitive to the variation of the cation composition in the nutrient solution. Antagonism between K-Mg was apparent.