对称自对偶李代数的一些性质

给出一类带有非退化对称不变双线性型及对称自对偶李代数的分解唯一性的一个充分条件,并讨论此类李代数的特殊性质.     

屈大均与佛山文化

番禺人屈大均，是明末清初的著名诗人，又是一位著作等身的学者，在岭南文化思想史上占重要的地位。他对佛山的历史、地理及人文情况十分熟悉，在他很多的诗篇和著作中均有记述和评论，为佛山人留下一份丰厚的、珍贵的文化遗产。     

一种逆向改进型A*路径搜索算法

针对路径搜索和路径优化问题,提出了一种改进的A＊搜索算法。通过逆序搜索和优化估价函数两种方法,将无向搜索转化为有向搜索,将全局估价转变为局部估价,提高了算法效率,使之更适合处理大规模的路径优化问题,消除了复杂环境下路径搜索中可能出现的假“死”现象,同时也提供了一种提高大规模仿真速度的新思路—路径搜索与仿真过程分离。最后,通过仿真试验验证了算法的可行性和有效性。     

猫爪藤的物候观测

经过2002年～2004年研究，认为光强是影响猫爪藤开花结实的主要生态因子，初步摸清了猫爪藤的物候节律，并初步确定其人工清除的时间．每年7月上旬果实开始成熟，7月下旬-8月上旬果实大量成熟．然后蒴果开始开裂．猫爪藤的防除应该选在每年7月上旬种子成熟之前，否则待种子成熟后再采取措施，会人为增加种子的扩散和传播．     

伴随矩阵A~*的主子式与A的主子式的关联性

揭示了A 的任意n-k阶主子式与A的k阶主子式之间的关系 .     

New antimicrobial activity for the catecholamine release-inhibitory peptide from chromogranin A

Catestatin (bCGA_344–364), an endogenous peptide of bovine chromogranin A, was initially characterized for its effect on the inhibition of catecholamine release from chromaffin cells. Catestatin and its active domain (bCGA_344–358) were identified in chromaffin cells and in secretion medium. The present study identified a potent antimicrobial activity of bCGA_344–358 in the lowmicromolar range against bacteria, fungi and yeasts, without showing any haemolytic activity. Confocal laser microscopy demonstrated penetration of the rhodaminated peptide into the cell membranes of fungi and yeasts and its intracellular accumulation. Time-lapse videomicroscopy showed arrest of fungal growth upon penetration of the labelled peptide into a fungal filament. We identified several catestatin-containing fragments in the stimulated secretion medium of human polymorphonuclear neutrophils, suggesting the N-terminal sequence of catestatin (bCGA_344–358) (named cateslytin) as a novel component of innate immunity.Received 21 October 2004; received after revision 6 December 2004; accepted 7 December 2004     

Tachykinins in regulation of gastric motility and secretion

The tachykinins constitute a family of neuropeptides with a common C-terminal amino acid sequence. The best known tachykinin is substance P. Tachykinins are found in the nerve plexuses and nerve fibers in the stomach of all species examined. The circular muscle layer is densely innervated, whereas the longitudinal layer and the mucosa are less intensively innervated. Tachykinins are also found in a significant number of afferent neurons with cell bodies in the dorsal root ganglia. Release of tachykinin can be demonstrated in response to both electrical stimulation of the vagus nerves and application of capsaicin. In the stomach all three known tachykinin receptors seem to be present. Although species variations exist, NK-2 receptors are generally present on the musculature, NK-1 receptors on both neurons and muscles, and NK-3 receptors on neurons only. Tachykinins stimulate motility in all parts of the stomach, but tachykinins also appear to inhibit motility in certain situations. Also, motility initiated centrally, mediated through the vagus nerves, is influenced by tachykinins. The precise role of tachykinin in the various motor programs in the stomach is not clear. Gastric acid secretion is influenced by tachykinins in several species. Tachykinins do not seem to act as neurotransmitters directly on parietal cells, but may have a modulatory function. The importance of tachykinins for the regulation of pepsinogen and hormone secretion from the stomach remains unclear. Received 24 August 1999; received after revision 1 December 1999; accepted 3 December 1999     

作战仿真应用中实时VV&A研究

作战仿真系统是一项复杂浩大的技术工程,由于其在应用领域的重要性以及系统开发中高投入高风险的现状,使得建模与仿真(M&S)的VV&A工作变得至关重要.以具体的工程实践为依据,系统分析了作战仿真的特点,研究了在作战仿真应用阶段,一种以任务空间概念模型为驱动、可互操作、自动化、实时的VV&A方法.     

不含悬挂点及含有一个悬挂点的A(H)=3图的存在问题

到目前为止所构作的A(H)=3图结构上的共性是含有两个悬挂点,现利用参考文献[3]的方法构作了两类不含悬挂点及含有一个悬挂点的满足A(H)=3的新图族,从而肯定了不含悬挂点及含有一个悬挂点且满足A(H)=3的图的存在非唯一性.