Control of the cardiovascular system ofAplysia by identified neurons

The neural network that controls the cardiovascular system ofAplysia adapts cardiovascular function to a variety of different physiological and behavioral situations. It (1) coordinates the cardiovascular system with the renal and respiratory systems; (2) modifies both systemic and regional blood flow during food-elicited arousal and feeding; and (3) changes the tension of longitudinal vascular muscle to adapt the arterial tree to changes in body shape. Indirect evidence suggests that the cardiovascular control circuit may also play a role in maintaining homeostasis during egg laying. Several putative neurotransmitters, including acetylcholine, serotonin, R151 and R152 peptides, have been localized to identified neurons in this circuit.     

Alzheimer's disease: fundamental and therapeutic aspects

Alzheimer's disease is the most common type of progressive and debilitating dementia affecting aged people. In some early — as well as late-onset familial cases, a genetic linkage with chromosomes 14, 21 (early-onset) or 19 (late-onset) has been indicated. Furthermore, a direct or indirect role has been attributed to normal or structurally altered amyloid -protein (concentrated in senile plaques) and/or excessively phosphorylated tau protein (located in neurofibrillary tangles). Degeneration of cholinergic neurons and concomitant impairment of cortical and hippocampal neurotransmission lead to cognitive and memory deficits. Several compounds are being tested in attempts to prevent and/or cure Alzheimer's disease, including tacrine, which has very modest efficacy in a sub-group of patients, and new acetylcholinesterase inhibitors. Pilot experiments have also been launched using nerve growth factor (NGF) to prevent or stabilize the processes of cholinergic pathway degeneration. Alternatively, antioxidants, free radical scavengers and/or non steroidal anti-inflammatory agents may be screened as potential therapies for neurodegenerative diseases induced by multiple endogenous and/or exogenous factors. The recent use of transgenic mice, in parallel with other genetic, biochemical and neurobiological systems, in vivo and/or in vitro (cell cultures), should accelerate the discovery and development of specific drugs for the treatment of Alzheimer's disease.     

GMP-stimulation of the cyanide-insensitive mitochondrial respiration in heat-shocked conidia ofNeurospora crassa

Summary In mitochondria of heat-shocked conidia ofNeurospora exogenous NADH and succinate were oxidized mainly via the alternative, hydroxamate-sensitive pathway (70%) and only 30% via the cytochromic, cyanide-sensitive pathway which was predominant in untreated conidia; the alternative oxidase pathway was markedly stimulated by guanosine 5-monophosphate (GMP).We are grateful to Mrs A. Cattaneo for her skillful technical assistance.     

小型无线网络的组建

无线局域网络相对于有线网络来说安装简单、灵活性高，并且随着笔记本电脑的普及和相关无线网络设备价格的降低，越来越多的小型企业和公共场所安装无线网络并提供相应的上网服务，对此类设备的选型和维护进行简单的说明。     

C1四次Pythagorean Bézier样条曲线的构造

根据PH曲线的定义,构造了Bézier形式的四次PH曲线,亦称之四次Pythagorean Bézier速端曲线(PB曲线),研究了四次PB曲线特征性质,构造了它的一阶Hermite插值曲线,得到了C1四次Pythagorean Bézier样条曲线。     

n指标局部鞅

本给出了n指标局部鞅的定义，证明了在g(F4)条件下，任一局部鞅均为局部S鞅。     

Ti3+:ZrSiO4中Ti3+中心g因子研究

锆英石(ZrSiO4)的热膨胀系数和导热系数较低,抗震性能和化学稳定出色,近年来,逐渐受到人们的重视.通过引入平均因子和3d1电子在D2d晶场的g因子公式,研究了Ti^3 :ZrSiO4中Ti^3 中心EPRg因子,得到的结果与实验值基本稳合.     

四面体四角晶位中络离子CoX_4~(2-)(X=Cl,Br)g因子的研究

用双自旋 轨道耦合参数模型研究了四面体四角晶位中络离子CoX2 -4 (X =Cl,Br)的g因子 .研究表明 ,配体Br对Co2 离子g因子的影响不能忽略 .     

关于“容斥原理的拓广及其应用”的注记

得到了赋权有限集上具带权表达式的广义容斥原理,改进了已有文献的一个定理的缺陷,并应用广义容斥原理拓广了ménage问题,且得到拓广的ménage问题的计数定理。     

论典型单李群的Aq(λ)的Langlands参数

设G为具有有限中心的非紧致典型单李群且K为G的最大紧致子群.假定rank G=rank K 且G/K为非Hermitian对称.当Aq(λ)在弱好区之外,给出了G的Aq(λ)的L anglands参数.