叶绿体结构和功能的研究——叶绿体残缺膜与线粒体嵴膜组合光合磷酸化活力的重建

本文证明了类囊体残缺膜可以与线粒体嵴膜组合而成为新囊膜。这种膜组织可以通过嵴膜的偶联因子借光能来进行光合磷酸化。电子显微镜图谱显示,这种膜组织是介乎残缺膜与嵴膜之间一种膜组织。 试验结果支持了这样一种观点,即:叶绿体内光合磷酸化与线粒体内氧化磷酸化的磷酸化机构是一致的,其细胞器可能是有着共同的来源。     

关于平面二次系统的极限环

关于常微分方程二次系统的极限环及分布结构,本文得到下述定理: 设有一个三阶细焦点,并且无限远奇点是唯一的简单的奇点,则必存在另外一个粗焦点。在粗焦点外有奇数个极限环,无限远奇点为鞍点,全局结构已定。 在上述的基础上对方程作参数的微小变化,使三阶细焦点跳出三个极限环,则得二个粗焦点,每个外面有奇数个极限环,总极限环数为偶数个,并至少为4个,全局结构已定。     

High-resolution NMR correlation spectra of disordered solids

We show how high-resolution NMR spectra can be obtained for solids for which the spectra are normally broadened due to structural disorder. The method relies on correlations in the chemical shifts between pairs of coupled spins. It is found experimentally that there are strong correlations in the chemical shifts between neighboring spins in both phosphorus-31 and carbon-13 spectra. These correlations can be exploited not only to provide resolution in two-dimensional spectra, but also to yield "chains" of correlated chemical shifts, constituting a valuable new source of structural information for disordered materials.     

From second to first order transitions in a disordered quantum magnet

The cross sections and transverse spin asymmetries in the hard exclusive electroproduction of decuplet baryons are calculated in the large N(c) limit and found to be comparable to that of octet baryons. Large N(c) selection rules for the production amplitudes are derived, leading to new sensitive tests of the spin aspects of the QCD chiral dynamics both in the nonstrange and strange sectors. Importance of such studies for the reliable extraction of the pion form factor from pion electroproduction is explained.     

甲氧羰基亚甲基三苯基胂与氟代烯烃的反应

本文报道甲氧羰基亚甲基三苯基胂(Ⅰ)与氟代烯烃反应生成加成物,Ⅰ与4,4-二氯六氟丁烯-[1]反应,生成甲氧羰基-[4,4-二氯五氟丁烯-1]-基亚甲基三苯基胂(Ⅲ)和甲氧羰基4,4-二氯2,3,3,4-四氟丁酰基亚甲基三苯基肿(Ⅳ),Ⅲ通过氧化铝柱或经湿苯回流都转化为Ⅳ,Ⅰ与四氟乙烯和六氟丙烯都能发生反应,粗产物通过氧化铝柱后,分离得到相应的羰基化合物Ⅶ和Ⅷ,所有产物的结构都经元素分析、红外光谱、核磁共振谱和质谱分析证明。     

论Ore图的泛连通性

符合Ore条件的简单图称为Ore图,Ore条件指图的两个不相邻的顶点的度数之和不小于图的顶点数。本文搞清了Ore图的泛连通性,同时得到了Ore图的点(边)泛圈性的结果,推广了Bondy的一个结论。     

158 A Ge V p-Pb Pb-Pb碰撞中的单奇异和多奇异粒子产生

用描写相对论性核 核碰撞的LUCIAE模型及相应的MonteCarlo事例产生器分析了WA97最近发表的 1 5 8AGeVp Pb和Pb Pb碰撞中单奇异粒子 (Λ ,Λ)和多奇异粒子 (Ξ-,Ξ-,Ω-,Ω-)的多重数和横质量分布 .由于LUCIAE模型包含了弦碎裂微观过程中奇异夸克压低因子随碰撞体系的能量、中心度和质量的增大而增大 ,以及由它导致的相对论性核 核碰撞宏观过程中奇异粒子产额随上述三因素之增而增的物理机制 ;LUCIAE模型计算结果能较好描写WA97实验所揭示的相对论性核 核碰撞中奇异粒子产额随中心度之增而增和奇异粒子增强随奇异夸克数之增而增的实验事实 ,以及单奇异和多奇异粒子的横质量分布 .     

The effect of topical anesthesia on vocal fold motion

The objective of this study was to determine if topical anesthesia to the larynx and pharynx affects vocal fold motion during dynamic voice evaluation with transnasal flexible endoscopy. Transnasal dynamic laryngeal examinations of 10 patients with no voice complaints were evaluated by five blinded fellowship-trained laryngologists. Each patient was examined before and after application of topical anesthetic. Reviewers rated briskness of right and left vocal fold movement and longitudinal tension on a visual analogue scale. Statistical comparisons were made between individual subject scores before and after anesthetic application. Inter-rater reliability was also assessed. No statistical difference was observed between subject scores before and after anesthetic application. Average intraclass correlation coefficients were 0.643 and 0.591 for pre- and postanesthesia scores, respectively. Application of topical anesthesia to the larynx and pharynx does not affect vocal fold motion.     

分子内结构环境对解离能的影响

为了理解化学键的这一结构效应, 本文对具有相同化学键而分子内结构环境不同的系列分子进行了计算研究, 讨论了化学键结构环境对解离能的影响.