具有半对称循环联络的黎曼流形的超曲面

研究具对半对称循环联络的黎曼流形的超曲面，得到Ｇａｕｓｓ方程和ＷＷｅｉｎｇａｒｔｅｎ方程，进一步给出半对称循环联络的一个性质。     

磁约束氦放电及其辐射特性研究

介绍了一种新型气体激光激励结构－磁约束平板放电装置，测量了原子气体氦在这种装置中的放电伏安特性，以及不同条件下氦的放电电流密度和光谱辐射强度，利用该装置，获得了较宽气压范围、大电流密度的稳定直流放电。通过实验，提出了将这种放电结构应用于选择激发，以及应用于发展高功率激光器的设想。     

处理助剂厂废水有F2和H2菌株的分离鉴定

从助剂厂废水和生活污水流经的污泥中分离出Ｆ２和Ｈ２菌株，经鉴定Ｆ２为荚膜红假单胞菌，Ｈ２为泥生绿硫菌。讨论了Ｆ２和Ｈ２菌株特征及功能，初步认为它们对助剂厂废水具有高效降解作用。     

硫酸盐还原菌对碳钢腐蚀的影响研究

研究了ＳＲＢ在无氧气氛下对碳钢的腐蚀作用，以ＡＰＩ培养基为基础的腐蚀失重试验表明，在接种ＳＲＢ后，碳钢腐蚀速度明显下降，而当加入Ｆｅ２＋离子后，ＳＲＢ的繁殖速度明显加快，且腐蚀速度的增加幅度更大，进一步的研究结果显示，碳钢在此条件下的腐蚀速度与ＳＲＢ的数量和活性并无直接的关系，而主要在于细菌繁殖过程和钢铁腐蚀过程中，在金属表面所产生的铁硫化物膜的性质     

Effects of truncated mutants of the ε subunit of chloroplast ATP synthase on the fast phase of millisecond delayed light emission of chloroplast and its ATP synthesis ability

The ε subunit of the chloroplast ATP synthase and the truncated ε mutants which lack some amino acid residues from the N-terminus or C-terminus were overexpressed in E. coil When the ε subunit or the truncated ε proteins was added to the spinach chloroplast suspension, both the intensity of the fast phase of millisecond delayed light emission (ms-DLE) and the cyclic and noncyclic photophosphorylation activity of chloroplast were enhanced. With an increase in the number of residues deleted from the N-terminus, the enhancement effect of the N-terminal truncated proteins decreased gradually. For the C-terminal truncated proteins, the enhancement effect increased gradually with an increase in the number of residues deleted from the C-terminus. Besides, the ATP synthesis activity of ε-deficient membrane reconstituted with the ε subunit or the truncated ε proteins was compared. The ATP synthesis activity of reconstituted membrane with the N-terminal truncated proteins decreased gradually as the number of residues deleted from the N-terminus increased. For the C-terminal truncated proteins, the ATP synthesis activity of reconstituted membrane increased gradually with an increase in the number of residues deleted from the C-terminus, but was still lower than that of the wild type ε protein. These results suggested that: (a) the N-terminal domain of the ε subunit of the chloroplast ATP synthase could affect the ATP synthesis activity of ATP synthase by regulating the efficiency of blocking proton leakage of ε subunit; and (b) the C-terminal domain of the ε subunit of the chloroplast ATP synthase had a subtle function in modulating the ATP synthesis ability of ATP synthase.     

A proteomic analysis of bacterial strain<Emphasis Type="Italic">Sinorhizobium fredii</Emphasis> RT19 subjected to salt shock

Sinorhizobium fredii RT19, a strain of freeliving bacteria, was subjected to salt shock and its protein expression profiles were analyzed by differential display proteome approaches. The results of separation by two-dimensional polyacrylamide gel electrophoresis (2D PAGE) showed that the number of resolved proteins was 481, 465 and 424, corresponding to salt-free control, 5 and 50 min 1 mol/L salt treatment, respectively. Among the resolved proteins, 82 in total had altered expression in response to salt-shock stress. 26 out of the 82 proteins were induced and 23 were completely inhibited, while 12 were up-regulated and 21 down-regulated in response to salt shock. In addition, the appearance of differentially displayed proteins responding to different salt shock periods is also reported. The identity of the 26 induced proteins was revealed by matrix assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF/MS) followed by database searching. Among them, 20 were assigned to proteins with known functions. Their roles in response to salt shock stress are discussed.     

Study on screening and cultivation conditions of xylanase-producing alkalophilic bacterial

Xylanisthemajorcomponentofplantcellwallsandthemostabundantpentosaninnature.Xylancontainsβ 1,4 linkedd xylosebackboneswitharabinose,4 O methyl d glucuronicacid,andaceticacidsubstituents[1 ] .Thexylan degradingen zymesincludeendoxylanase(1,4 β d xylanxylanohydrolase;EC3.2 .1.8)and β xylosidase (1,4 β d xylanxylanohydrolase;EC 3.2 .1.37) .xylanasedegradesthexylanbackboneintoxylo bioseandxylooligosaccharides,whileβ xylosidasereleasesxylosylresiduesfromthenonreducingendsofxylooligosaccha…     

Production of bacterial blight resistant lines from somatic hybridization between Oryza sativa L. and Oryza meyeriana L

Novel bacterial blight (BB) resistance gene(s) for rice was (were) introduced into a cultivated japonica rice variety Oryza sativa (cv. 8411), via somatic hybridization using the wild rice Oryza meyeriana as the donor of the resistance gene(s). Twenty-nine progenies of somatically hybridized plants were obtained. Seven somatically hybridized plants and their parents were used for AFLP (amplified fragment length polymorphism) analysis using 8 primer pairs. Results confirmed that these plants were somatic hybrids containing the characteristic bands of both parents. The morphology of the regenerated rice showed characters of both O.sativa and O.meyeriana. Two somatic hybrids showed highest BB resistance and the other 8 plants showed moderate resistance. The new germplasms with highest resistance have been used in the rice breeding program for the improvement of bacterial blight resistance.