转型期农业专业图书馆可持续发展的途径

本文针对农业专业图书馆转型期面临的挑战、困难 ,论述了专业图书馆必须坚持内涵发展、协调发展、稳定发展、重点发展 ,才能保证它的可持续发展     

粮食生产机械化的新机遇

强调了粮食生产机械化发展的必然趋势，从农业技术变迁、农业现代化、劳动力转移和经济发展等方面论述了发展粮食生产机械化的重要作用。指出了发展效益农业、持续农业和精确农业给粮食生产机械化带来的新机遇。     

线粒体与细胞凋亡

细胞凋亡是一种由基因控制的细胞自杀性死亡过程,是机体维持自身稳定的一种基本生理机制。机体通过细胞凋亡清除损伤、衰老与突变的细胞,维持生理平衡。通过对细胞凋亡的研究发现,线粒体在调节细胞凋亡中发挥着关键作用。尤其是被称为细胞凋亡主开关的线粒体通透性改变孔(MitochondrionPermeabilitytransitionPore,MPTP),它是细胞色素C、Smac、AIF等凋亡诱导因子的主要来源。本文以MPTP的开放、细胞色素C、AIF在细胞凋亡中的作用以及Bcl-2家族对细胞凋亡的调控做一综述,以便广大读者能系统地了解线粒体在细胞凋亡中的作用。     

过渡地区休眠暖地型草坪草交播技术与展望

本文对我国过渡地区暖地型草坪草冬季交播技术,如交播概念、原理、草坪类型、草种选择、草种播种量及交播草坪建植与管理进行了详细介绍,以期为过渡地区建植四季长绿草坪提供技术上的支持。     

柴达木盆地东部环境演化对古文化的影响

研究表明晚全新世柴达木盆地气候进一步向干旱化方向发展,气候的干旱化以及由此导致的环境变化对盆地古文化产生了深刻的影响,全新世气候与环境的变化深刻地影响着柴达木盆地古人类文化的出现、发展与衰亡。地层剖面测年与分析表明,柴达木盆地诺木洪文化兴盛于约3300aB.P.,衰亡于约2900aB.P.,诺木洪文化在这发展过程中受气候波动的影响曾出现一次文化断层,由此可将诺木洪文化分为前后两期。环境变化是柴达木盆地史前古人类文明兴衰重要决定因素。     

含糖类物料的喷雾干燥

从玻璃态转变温度着手,分析了在喷雾干燥中含有不同品种糖类物料粘壁的原因,提出了改性或在设计干燥流程时的6种应对方法。     

非瞬时或突变的马尔可夫链的一种应用方法

介绍对于一种非瞬时或突变的状态转移过程.采用Bayes方法修订马尔可夫过程的状态转移概率矩阵;将先验概率分布修订为后验概率分布;对整个过程的信息加以吸收,得出能够反映整个过程的状态转移概率矩阵,从而达到预测目的.由此还得出一个重要结论:吸收信息的无序性.     

基于形式规约的软件测试用例自动生成技术研究

在Hierons提出的一种基于Z语言软件自动测试方法的基础上进行了拓展．该方法基于软件的Z语言规约；以HierOns提出的推理规则为基础，提出了分裂树的算法，将操作模式的约束条件转换为形如ViPi∧Qi的析取范式；然后根据析取范式将Z语言描述的操作模式划分为子操作模式；依据子操作模式的前置条件和后置条件，将子操作模式作为状态转换图的转换关系，构建了被测试软件的状态转换图；依据状态转换图，提出了相应的状态覆盖准则、转换关系覆盖准则和转换关系谓词覆盖准则等测试数据选择准则．     

Dopamine Antagonist Affects Luteal Function But Not Cyclicity During the Autumn Transition

The autumn transition is characterized by a number of anomalies affecting the luteal phase of the estrous cycle, such as declining progesterone secretion from the corpus luteum and increased rate of failure of luteolysis. Prolactin also decreases. We theorized that these events may be linked, possibly through dopamine. We administered domperidone, a specific dopamine D2 receptor antagonist from September 12 to anestrus or January 15, either daily (n = 8), or once per day for the first 7 days of each month (n = 7). Controls (n = 7) received no treatment. Mean progesterone and prolactin concentrations were compared with summer cycles. Time to entry into anestrus and incidence of spontaneously prolonged luteal activity was compared between groups during the autumn transition. Prolactin declined from June through October equally in all groups. There was no difference between groups in time to anestrus. Progesterone decline was prevented (daily treatment) or delayed for a prolonged period (weekly group) in autumn. The incidence of spontaneously prolonged corpus luteum activity was reduced to summer levels in both domperidone groups compared with the control. We concluded that autumn prolactin decline was not driven through dopaminergic D2 receptor inhibition of pituitary lactotrophs. Sustained progesterone synthesis through the autumn may be the result of action of the D2 receptor antagonist with dopamine receptors on the corpus luteum. Autumnal luteolytic function appears to have a dopamine-influenced component. There does not appear to be a causative relationship between autumnal progesterone and prolactin secretion.