郁金香春节促花栽培

郁金香是世界名贵花卉，但多数是在温室大棚里培育出来的。本文介绍了打破常规、进行自然条件下的郁金香春节促花栽培的方法。     

触角嗅觉神经束路示踪的赖氨酸钴填充方法

应用赖氨酸钴填充技术 ,观察雄蛾触角嗅觉神经的传入途径及向中枢投射踪迹的方法和操作程序。结果显示赖氨酸钴填充的神经元成黑色 ,与周围环境反差较大 ,清晰易辨 ,能准确反映触角神经元的生理特性及其向中枢投射位置     

非线性嗅觉生理模型在一维序列识别中的应用

Water J Freeman教授在生理实验的基础上建立了一套基于嗅觉系统的神经网络模型。这套模型运用非线性动力学的方法较好的模拟了人体的嗅觉系统,并能够产生类似脑电的非周期背景信号。利用这个的基于嗅觉系统而建立的模型--K系列模型可以实现模式识别。本文首先从原理上介绍了K系列模型的拓扑结构和数学基础,然后通过实际的计算机数值模拟介绍了KII网络和KIII模型在实现一维序列识别时的方法和结果,简单说明了这个模型在模式识别上的特点。     

二十二碳六烯酸改善老年大鼠嗅觉记忆行为潜在机制的研究

实验研究二十二碳六烯酸(DHA)对老年大鼠嗅觉辨识记忆行为和嗅球脂肪酸以及GAP-43和PSD-95蛋白表达的影响.实验每天按照180 mg·kg-1灌喂24月龄老年大鼠49 d.在43, 44和45 d进行嗅觉辨识学习记忆行为的训练,第46,47,48 d进行嗅觉辨识学习记忆行为学实验,第49 d处死.实验结果表明: DHA能显著提高老年大鼠嗅觉辨识记忆能力, DHA组老年大鼠嗅球中n3不饱和脂肪酸与老年组相比含量显著提高,嗅球中n6多不饱和脂肪酸与老年组相比含量显著降低.另外,DHA 的含量在DHA组中明显比老年组增高,n3/n6多不饱和脂肪酸的比值也明显增大,但是AA的含量则显著减少.用 Western bolting方法分析生长相关蛋白(GAP-43) 和突触后致密物质95的表达后显示：DHA能提高老年大鼠嗅球GAP-43和PSD-95的表达水平.     

基于AR信号处理和KII模型的嗅觉识别算法

信号的特征提取和模式识别方法,在实现准确的电子鼻气体定性分析中尤为关键,本文提出了基于AR信号处理和KII模型的嗅觉识别算法．将传感器信号分为：上升期和稳定期两部分,对上升期信号提取斜率作为特征;对稳定期信号,进行AR建模来提取特征．在电子鼻的模式识别算法上,利用KII模型对气味信号进行分类．该方法充分利用了AR信号处理在信号表示方面的有效性及降维优势、KII模型在模式识别方面的优越性．仿真将该方法与BP网络、AR—BP算法及单KII网络进行了比较,结果表明,AR信号处理技术可以很好的提取特征,并与KII建立相关的数学模型,将AR信号处理技术应用到电子鼻系统中是可行的,且具有更高的识别率．     

揭开嗅觉之奥秘

简要介绍了2004年诺贝尔生理学或医学奖得主和获奖成就,并阐述了嗅觉与生活和体育运动的密切关系.     

The migration of luteinizing hormone-releasing hormone (LHRH) neurons from the medial alfactory placode into the medial basal forebrain

Summary Over the years, investigators have noticed, in a wide variety of species of vertebrates, large numbers of cells migrating from the olfactory placode to the forebrain. These cells were considered to be Schwann cells or ganglion cells of the terminalis nerve. Recently, immunocytochemical localization studies have shown that many of these migrating cells contain luteinizing hormone-releasing hormone (LHRH), a brain peptide that regulates reproductive functions by evoking the release of luteinizing hormone and follicle-stimulating hormone from the anterior pituitary gland. The origin of LHRH cells in the epithelium of the medial olfactory placode, their migration across the nasal septum and into the forebrain, with branches of the terminalis nerve, also a derivative of the medial part of the olfactory placode, has led to some interesting speculations, from evolutionary and physiological perspectives, about the origin of these cells and the role of the terminalis nerve in their migration.     

Chemical communication in invertebrates

Conclusions In conclusion, olfactory pheromones are widespread in nature and control many fundamental aspects of an insect's life. Detailed behavioral observations in the field and laboratory indicate the great complexity of most pheromone communication systems. The preliminary electrophysiological experiments on single olfactory receptor neurons that we have described here, point toward the possibility of unraveling the basic physiological mechanisms underlying these behavioral complexities. This information is directly applicable to many problem areas in chemoreception and could provide a base for the rational use of pheromones in the control of insect pests. *** DIRECT SUPPORT *** A2025171 00003     

Zn2+、Ca2+及其相互作用对大蒜根尖生长和细胞分裂的影响

用不同浓度的Zn2+、Ca2+和Zn2++Ca2+溶液处理大蒜鳞茎发现;Ca2+能抑制Zn2+的毒害,明显提高细胞分裂比率,促进根尖生长,降低异常细胞比率.基本趋势为根的长度和细胞分裂比率为Ca2+>Zn2++Ca2+>Zn2+,异常细胞比率为Ca2+>Zn2+>Ca2++Zn2+.     

灯泡贯流式水轮机轮缘间隙流动的数值模拟

通过对灯泡贯流式水轮机在不同工况、不同轮缘间隙的泄漏流动进行数值模拟,得到了不同协联工况下轮缘间隙泄漏流动和叶片表面的压力及流线的分布规律。分析了不同轮缘间隙值下的泄漏流动对主流和水轮机效率的影响,从而为灯泡贯流式水轮机的水力设计和轮缘间隙的合理确定提供了理论依据。