玉米大斑病菌HT-毒素特异性组分与原生质膜蛋白互作研究

以玉米叶片原生质为研究对象,以ANS(1-苯胺基-8-萘磺酸)作荧光探剂,用荧光标记法研究了毒素与质膜蛋白的互作.在被ANS标记后的原生质悬浮液中加入不同浓度HT-毒素后,ANS荧光强度明显增加,呈现出了剂量—效应关系,表明HT-毒素与质膜上ANS某些受体发生了互作.本实验采用2种试剂,从2个角度表明了ANS受体和质膜上存在的毒素受体具有蛋白特性.初步推测HT-毒素特异性组分的原初作用位点在质膜外侧.     

碳点的制备及其荧光共振能量转移

以枝状聚乙烯亚胺和柠檬酸为原料,低温熔融法一步合成水溶性的氨基化碳点,碳点在紫外光激发下发出明亮的蓝光.采用傅里叶变换红外光谱和X射线粉末衍射仪对其结构进行表征,并研究其与碲化镉量子点在液相和固液界面的荧光共振能量转移.实验结果表明:液相中的荧光共振能量转移效率远大于固液界面的荧光共振能量转移,且能量转移具有一定的限度.     

量子点在荧光共振能量转移技术中的应用研究

量子点作为新型的荧光探针应用于共振能量转移技术中,该文评述量子点在荧光共振能量转移技术中应用的研究进展,结合作者课题组的研究提出展望.     

DNA的荧光分析--DNA对吖啶橙(AO)-中性红(NR)能量转移影响的研究

介绍了近几年荧光能量转移体系用于DNA分析测定方法的进展 .通过实验对吖啶橙 (AO)_中性红 (NR)荧光体系能量转移进行分析 ,说明使用该体系可用于对DNA定量测定 .然后通过Forster能量转移理论 ,计算DNA加入前后AO_NR体系临界距离变化 ,从某种程度上说明DNA对AO_NR荧光淬灭的影响 .     

DNA的荧光分析—DNA对吖啶橙（AO）中性红（NR）能量转移影 …

介绍了近几年荧光能量转移体系用于ＤＮＡ分析测定方法的进展，通过实验对吖啶橙－中性红荧光体系能量转移进行分析，说明使用该体系可用于对ＤＮＡ定量测定。然后通过Ｆｏｒｓｔｅｒ能量转移理论，计算ＤＮＡ加入前后ＡＯ－ＮＲ体系临界距离变化，从某种程度上说明ＤＮＡ对ＡＯ－ＮＲ荧光淬灭的影响。     

柚皮苷与人血清蛋白作用机理探索

利用荧光光谱及同步荧光光谱法研究了柚皮苷与人血清蛋白相互作用.结果表明,相互作用使得人血清蛋白荧光猝灭且引起蛋白构象改变;猝灭常数大小证明人血清蛋白荧光猝灭机制为静态猝灭;根据能量转移原理求得结合距离为3.7 nm,存在发生能量转移的可能性.     

聚苯乙烯微球中荧光共振能量转移的研究

采用分散共聚合法制备了单分散的负载有1,8-萘酰亚胺染料的荧光微球。利用供体和受体染料间的荧光共振能量转移,荧光微球在激发供体染料时同时实现了供体和受体染料的双重荧光发射信号。结果表明:当微球中染料的浓度相对较低(质量分数小于0.2%)时,荧光共振能量就可以有效地发生转移。聚合过程中增加供体或受体染料的浓度都会提高能量转移效率,这是浓度增加使得染料分子间距离缩短造成的。通过调整微球中染料浓度可以获得不同能量转移效率、具有荧光编码信号的系列荧光微球。这类粒径均一的荧光微球在多元生物分析中有潜在的应用价值。     

混合染料分子系统内能量转移

研究阴、阳离子型染料分子荧光素钠（ＦＳ）、诺单明（Ｒｈ６Ｇ）的吸收光谱及荧光光谱．发现这两种混合染料之间存在能量转移效应,能量转移属激基复合物内部的交换能量转移．     

混合染料分子系统内能量转移

研究阴、阳离子型染料分子荧光素钠（ＦＳ）、诺单明（Ｒｈ６Ｇ）的吸收光谱及荧光光谱。发现这两种混合染料之间存在能量转移效应，能量转移属激基复合物内部的交换能量转移。     

混合染料激光能量转移研究

在某些混合染料体系中,能量转移已成为扩展激光波长范围的一种有效方法,当施主吸收光谱与受主荧光光谱部分重叠时,有可能出现能量转移过程.同时,进一步研究能量转移过程,可对生物分子中分子间能量转移进行分析.本文研究若丹明 B 通过若丹明6G 转移能量     

红景天甙对人红细胞膜流动性的影响

利用荧光技术,研究红景天甙对人红细胞膜流动性的影响．结果表明,红景天甙对膜脂疏水链区流动性无显著影响;但红景天甙浓度增加对膜脂极性基区流动性有增强作用;红景天甙对膜蛋白也有作用     

Applications of membrane distillation technology in energy transformation process-basis and prospect

Membrane distillation technology is a new type of efficient separation technology that combines traditional distillation technology and membrane separation technology. In the study, applications of membrane distillation technology in thermal engineering and refrigerating engineering with typical energy transformation process were presented. Desorption and regeneration process of saline solution by vacuum membrane distillation was proposed on the basis of the concentration and separation properties of membrane distillation. Membrane distillation technology could be used in lithium bromide absorption refrigeration system, energy storage system, and the regeneration process of liquid desiccant solution in temperature-humidity independent control air-conditioning system. The aim of the applications was to use the low-grade energy such as waste heat, solar energy and geothermal energy adequately and to improve the available temperature difference of heat source. According to latent heat transfer and thermal conduction across the membrane in direct contact membrane distillation process, a novel membrane heat exchanger with both heat transfer and mass transfer processes was proposed. The heat exchanger could be used as the solution heat exchanger of lithium bromide absorption refrigeration system and as the special heat exchanger that recovered heat and pure water simultaneously. Some feasible process flows about the applications of membrane distillation technology to energy transformation process were listed and analyzed. Finally, future research emphases were indicated.     

板翅式全热交换器热回收效率分析

空调系统中已逐渐采用全热交换器以降低系统能耗．通过对不同运行条件下全热交换器的性能进行分析，计算了全热交换器运行特性与运行工况之间的关系，指出传热阻与传湿阻的构成差异和全热交换器显热与潜热交换过程的不同特征，并对处理风量、交换膜厚度和吸湿特性等主要因素对全热交换器能量回收效率的影响作用进行了分析和讨论．     

ANS分子光学性质的溶剂效应研究

研究了ANS分子的非线性光学性质。采用极化连续模型对ANS分子在不同溶剂中的几何结构进行了优化,考察了不同溶剂对ANS分子几何结构的影响,讨论了ANS分子的一阶非线性超极化率与溶剂极性之间的关系。     

Proton-coupled electron transfer drives the proton pump of cytochrome c oxidase

Electron transfer in cell respiration is coupled to proton translocation across mitochondrial and bacterial membranes, which is a primary event of biological energy transduction. The resulting electrochemical proton gradient is used to power energy-requiring reactions, such as ATP synthesis. Cytochrome c oxidase is a key component of the respiratory chain, which harnesses dioxygen as a sink for electrons and links O2 reduction to proton pumping. Electrons from cytochrome c are transferred sequentially to the O2 reduction site of cytochrome c oxidase via two other metal centres, Cu(A) and haem a, and this is coupled to vectorial proton transfer across the membrane by a hitherto unknown mechanism. On the basis of the kinetics of proton uptake and release on the two aqueous sides of the membrane, it was recently suggested that proton pumping by cytochrome c oxidase is not mechanistically coupled to internal electron transfer. Here we have monitored translocation of electrical charge equivalents as well as electron transfer within cytochrome c oxidase in real time. The results show that electron transfer from haem a to the O2 reduction site initiates the proton pump mechanism by being kinetically linked to an internal vectorial proton transfer. This reaction drives the proton pump and occurs before relaxation steps in which protons are taken up from the aqueous space on one side of the membrane and released on the other.     

Three-dimensional structure of plant light-harvesting complex determined by electron crystallography

The structure of the light-harvesting chlorophyll a/b-protein complex, a membrane protein serving as the major antenna of solar energy in plant photosynthesis, has been determined at 6 A resolution by electron crystallography. Within the complex, three membrane-spanning alpha helices and 15 chlorophyll molecules are resolved. There is an intramolecular diad relating two of the alpha helices and some of the chlorophylls. The spacing of the chlorophylls suggests energy transfer by delocalized exciton coupling and F?rster mechanisms.     

Assessment of autonomic nervous system activity by heart rate recovery response

The assessment of autonomic nervous system (ANS) activity is a tool for diagnosing or predicting cardiovascular diseases,while heart rate recovery response (HRRR) after exercise has been promoted as a process under the regulation of ANS (sympathetic and parasympathetic nervous systems).Therefore,assessment of ANS activity was performed by HRRR in this study.Firstly,HRRR signal was extracted based on wavelet decomposition and difference curve of coarse component from heart rate signal.Then,HRRR was divided into quickly descending interval (QDI) and slowly descending interval (SDI).Finally,3 groups of indexes (Difference,Exponential and Quadratic Groups) from QDI and SDI were compared between 50 normotensive and 61 hypertensive subjects.The results showed that the indexes of Difference Group were better choices than others in analyzing the features of HRRR.Furthermore,parasympathetic activity is dominant in QDI,while sympathetic and parasympathetic activities affect SDI together.In conclusion,the proposed method was effective to assess ANS activity.     

ASN.1的应用开发

主要研究移动通信系统中ANS．1的应用开发过程和编码规则，首先简单介绍ANS．1的基本概念，然后简单描述ANS．1的应用开发过程，最后结合一个例子，重点介绍BER编码规则和PER编码规则，这些研究对移动通信系统中的协议开发有重要的指导意义．     

Crystal structure of plant photosystem I

Oxygenic photosynthesis is the principal producer of both oxygen and organic matter on Earth. The conversion of sunlight into chemical energy is driven by two multisubunit membrane protein complexes named photosystem I and II. We determined the crystal structure of the complete photosystem I (PSI) from a higher plant (Pisum sativum var. alaska) to 4.4 A resolution. Its intricate structure shows 12 core subunits, 4 different light-harvesting membrane proteins (LHCI) assembled in a half-moon shape on one side of the core, 45 transmembrane helices, 167 chlorophylls, 3 Fe-S clusters and 2 phylloquinones. About 20 chlorophylls are positioned in strategic locations in the cleft between LHCI and the core. This structure provides a framework for exploration not only of energy and electron transfer but also of the evolutionary forces that shaped the photosynthetic apparatus of terrestrial plants after the divergence of chloroplasts from marine cyanobacteria one billion years ago.