pH Dependence of Chlorophyll States, Protein Structures and Function of the PSII Membranes

IntroductionPhotosystem II ( PSII) is a pigment- proteincomplex in the thylakoid membrane. Its reactioncenter( PSII- RC) ,which is composed of D1 andD2 proteins,generates the highly positive oxidantrequired for the oxidation of water by light- drivencharge separation. Water oxidation occurs at theMn4cluster positioned atthe center of the oxygen-evolving complex on the lumenal surface of PSII.In green plants,the highly reactive Mn4cluster isshielded by a number of extrinsic proteins( 33…     

DLC多层膜对9Cr18微动磨损性能的影响

采用等离子体源离子注入（PSII）技术在9Cr18不锈钢基体上制备类金刚石碳膜（DLC）多层膜，比较了该多层膜与N注入层对基体微动磨损性能的影响，结果表明，注入N后，改性层内形成了CrN,Cr2N和Fe3N等氮化物相；PSII技术能够提高9Cr18不锈钢的抗微动磨损性能，实验所制备的DLC多层膜比N注入层具有更好的抗微动磨损性，这与最外层LDC膜的高硬度和低摩擦系数有关。     

中心电极射频感应等离子体管件内表面改性

本文利用中心电极射频感应等离子体对金属管件内壁进行表面改性处理,验证了该方法的合理性以及可行性.利用该方法制备出了类金刚石(DLC)薄膜,为管型和瓶型样品的内壁强化提供新的手段.     

Research progress in the inner surface modification of metal tubes by plasma processing

The recent progress in inner surface hardening of tubes by plasma processing is summerized. Several techniques of inner surface plasma source ion implantation and deposition are introduced, and their advantages and disadvantages are discussed. The basic principles, technical features and new progress of inner surface plasma source ion implantation methods for metal tubes, which were developed in our laboratory, are described in detail. And perspectives of the future technical development for inner surface ion implantation of tubes are presented.     

Heat Denaturation of Protein Structures and Chlorophyll States in PSII Membranes

IntroductionPhotosystem II (PSII) is a large supramolecularpigment-protein complex found in the thylakoidmembranes of green plants,algae andcyanobacteria.Its main role is to drive light-induced electron transfer from water toplastoquinone with a concomitant production ofmolecular oxygen.PSII membranes consist of anouter antenna portion of light-harvestingchlorophyll (Chl) a/b binding complexes (LHCII)and a core fraction.The core fraction is composedof an inner antenna of membrane-bound …     

PSII核心复合物超快动力学研究

应用时间分辨荧光光谱技术，研究了高等植物光系统Ⅱ（PSⅡ）核心复合物中能量传递超快动力学。对实验测得的荧光衰减曲线，进行数据处理，解得荧光衰减的3个时间常数分别为3.9,20.4,930.5ps，各组分荧光占总荧光的百分比分别为1.0%,12.7%,86.3%。对由全局分析得以的荧光强度随波长变化曲线运用高斯多峰解叠运算，解得3个峰值波长分别为671.03,684.74,696.16nm。通过分析，给出了激发能在PSⅡ核心复合物中超快传递的动力学信息及相应的能级关系图。     

除草剂生物活性测定

除草剂生物活性测定是度量除草剂对杂草生物效应大小和对农作物安全性的农药生物测定． 本文采用希尔反应（ＨｉｌｌＲｅａｃｔｉｏｎ）活力的分光光度法，测定了根据定量药物分子设计而合成出的五种光合作用光系统ＩＩ（ＰＳＩＩ）抑制剂的活性，获得了它们的ｐＩ５０数据．     

Involvement of DEG5 and DEG8 proteases in the turnover of the photosystem II reaction center D1 protein under heat stress in Arabidopsis thaliana

Deg5,deg8 and the double mutant,deg5deg8 of Arabidopsis thaliana were used to study the physiological role of the DEG proteases in the repair cycle of photosystem II (PSII) under heat stress. PSII activity in deg mutants showed increased sensitivity to heat stress, and the extent of this effect was greater in the double mutant, deg5deg8, than in the single mutants, deg5 and deg8. Degradation of the D1 protein was slower in the mutants than in the WT plants. Furthermore, the levels of other PSII reaction center proteins tested remained relatively stable in the mutant and WT plants following high-temperature treatment. Thus, our results indicate that DEG5 and DEG8 may have synergistic function in degradation of D1 protein under heat stress.     

氮离子重叠注入对38CrMoAl硬度与耐磨性能影响的研究

研究了氮离子重叠注入对38CrMoAl硬度和耐磨损性能的影响。通过实验证实：用优化的2CI PSⅡ氮离子重叠注入对38CrMoAl材料耐磨性能有显著改善。