木枣多糖的理化特性研究

木枣经超声波辅助酸性缓冲液浸提、醇沉、脱蛋白和脱色工艺制得木枣多糖,测定其溶解性与单糖组成,采用Q2000型差示扫描量热仪和ZX7M-AR1000型流变仪研究木枣多糖的稳定性和流变性,为其在食品工业中的应用提供理论数据支持。实验结果表明,木枣多糖溶于热水,难溶于冷水,不溶于有机试剂；是由鼠李糖、阿拉伯糖、甘露糖、葡萄糖、半乳糖组成的杂多糖。热学特征分析表明木枣多糖具有较好的热稳定性；木枣多糖溶液为非牛顿假塑性流体,表现出剪切变稀的特性；因此木枣多糖适用于在食品生产工业中做稳定剂。     

对秦优7号油菜新品种的抗逆性和丰产性的评价

在对我国20世纪90年代推广的部分高产杂交油菜新进行组合比较试验的基础上，我们筛选了9个有代表性的骨干组合。在相同条件下的超低密度高产栽培，其中以秦优7号为代表的4种杂交油菜新组合具有抗逆性和丰产性。     

Debaryomyces sp.甘油激酶基本动力学性质研究

通过平板初筛和摇瓶复筛,从105株菌中筛得一株甘油激酶的高产菌株,并研究了其所产甘油激酶的动力学性质.研究结果表明:在MES系统中,甘油激酶有较好的酸碱稳定性,pH稳定范围为5.5～10.5;最适pH和最适温度分别为pH 8.0和50℃,该酶催化甘油的米氏常数(Km)为3.5×10-5mol/L,催化ATP的Km为4.46×10-4mol/L.同时对一些金属离子和有机化合物对酶活性的影响也进行了研究.     

毛杨梅树皮原花色素对小鼠急性毒性及抗氧化性的影响

探讨了毛杨梅树皮原花色素提取物的安全性,分析了毛杨梅树皮原花色素对小鼠的急性毒性以及在小鼠体内的抗氧化性能.结果表明:毛杨梅树皮原花色素提取物经口的LD50为5 g/kg.毛杨梅树皮原花色素给药后,小鼠血清内的过氧化氢酶(CAT)、超氧化物歧化酶(SOD)活性显著性增加(p＜0.05),丙二醛(MDA)含量减少.小鼠肝内的CAT活力显著增加,MDA含量也有所增加,但是并没有显著性差异(p＞0.05).因此,毛杨梅树皮原花色素属于实际无毒物质,毛杨梅树皮原花色素提取物对小鼠机体具有一定的抗氧化作用.     

两参数混合型S.D.E 解的性质

设 M={Mz,Z∈R2 },A分别是两参数连续鞅和适应增过程,Y={Yz,Z∈R2 },为Poisson单,∧是Y的特征测度且N=Y-∧. 本文考虑如下混合型S.D.E: X2=X0 ∫R2f1(ξ,Xξ)dMξ ∫R2f2(ξ,Xξ)dAξ ∫Rzf3(ξ,Xξ)dNξ ∫Rzf4(ξ,Xξ)∧(dξ)其中z∈R2 .在方程系数fi,i=1,2,3,4满足一定假设条件下,得到了方程解的性质.     

CaFeO_(2.5)掺杂对PSZT压电陶瓷微观结构及电性能的影响

采用常规固相法制备了CaFeO2.5掺杂改性的Pb0.95Sr0.05(Ti0.47Zr0.53)O3压电陶瓷.利用X射线衍射、扫描电镜、精密阻抗分析仪等技术分析表征了该体系的微观结构及电性能.结果表明:CaFeO2.5掺杂促进了PSZT陶瓷的致密化,抑制了晶粒长大.CaFeO2.5掺杂引起晶格畸变,随CaFeO2.5掺杂量的增加,四方晶格发生膨胀,四方度增大;缺陷偶极子增加,降低了压电性能并出现了类似于反铁电性质的电滞回线"束腰"现象.     

几种非晶态合金的交流磁性研究

本文研究了四种非晶态合金的磁性参数随频率ｆ及磁感应强度Ｂ的变化规律，得出非晶态合金的磁化过程符合晶态金属磁畴理论的技术磁化规律；在中强场内交流损耗符合晶态金属磁损耗分离关系，找出了Ｐ／ｆ与频率ｆ关系曲线包含两条直线规律，求得直线转折所对应的频率约为２０ｋＨｚ；不同铁磁性非晶态合金在最大磁导率μｍａｘ值相差较大的情况下，磁损耗分离满足相同的规律。     

基本蚁群算法的A.S.收敛性研究

蚁群算法是近几年优化领域中新出现的一种启发式仿生类并行智能进化算法，虽然该算法已经在众多组合优化领域中得到广泛应用，但是对其收敛性尤其是A．S．（AlmostSurely）收敛性问题的研究还存在很多空白．本文在介绍蚁群算法基本原理的基础上，以Markov链和离散鞅作为研究工具，对基本蚁群算法的A．S．收敛性问题进行了理论证明，把最优解集序列转变为下鞅序列来考察残留信息素轨迹向量的收敛性，随后提出了基本蚁群算法首达时间的定义，并对基本蚁群算法首次到达时间的期望值进行了理论分析．     

Effects of heavy metal on dielectric properties of E. coli revealed by dielectric spectroscopy

Dielectric spectroscopy of E. coli cell before and after exposure to heavy metals Cd^2＋ , Cu^2＋ , Zn^2＋ and Ca^2＋ was investigated. The results indicate that changes in dielectric spectra reflect effects of heavy metal on the structure and function of E. coli cells. Heavy metal can change membrane capacitance as well as pennittivity and conductivity of the cytoplasm. Changes in volume fraction suggested that dielectric measurement could monitor the growth of E. coli cells. These results demonstrated that dielectric spectroscopy was a potential effective technique for studying electric properties of biological cells.     

食用菜籽蛋白的提取及其功能特性的研究

研究了食用菜籽蛋白的提取方法及其功能特性，并对其应用前景进行了讨论。     

Isolation and characterization of a new species of Vibrio-Vibrio olivaceus sp.nov. from diseased flounder （Paralichthys olivaceus temminck et schlegel）

One kind of pathogenic bacteria was isolated from diseased (or dead) flounder (Paralichthys olivaceus L.) which expressed bacterial septicaemia. The phenotyic information of the 10 pure cultures was studied extensively, including morphological characteristics, colony characteristics in different media, physiological and biochemical characteristics, and the mol%G C ratio of the DNA for representative strain. The results showed that the isolates belonged to a new species of Vibrio. In addition, the representative strains have been re-checked by China Center for Type Culture Collection (CCTCC), the results were the same as ours, the examined strains were also regarded as a new species of Vibrio, and designated as Vibrio olivaceus sp.nov. by its isolated fish (Paralichthys olivaceus) based on its biological properties following Rules of International Code of Nomenclature of Bacteria. In the same time, we conducted studies on the serum homology of isolates, pathogenicity of isolates by experimental infection. The results showed that all the isolates were of serologic similarity and the isolates have strong pathogenicity to flounder. Inspection to pure cultures and isolates from liver of moribund fish from infection experiment by fluorescent antibody technique showed the feasibility of fluorescent antibody technique as an auxiliary method of examination.     

天然活性成分生物转化的微生物、特异酶及其应用

介绍了天然活性成分生物转化的微生物、特异酶以及其应用.中草药等植物中含有的主要天然活性成分,人体难吸收、活性低.为了得到易吸收、高活性的天然有效成分,筛选了一批新微生物,发现一批新型特异的天然成分转化酶;研究了生物转化制备高活性天然成分单体、异构体混合物组、活性中草药制备.     

山东链霉菌产抗真菌物质的理化性质的初步研究

从土壤中筛选得到1株产广谱抗真菌物质山东链霉菌(Streptomyces shandongensissp．nov)，该菌代谢产物对多种植物病原真菌有很强的抗菌作用．研究了温度及pH变化、UV照射对该菌发酵液中抗菌物质的稳定性的影响；并利用pH纸层析等多种层析技术研究了该抗菌物质的水溶性、离子特性等一些理化性质，为这一农用抗生素的进一步纯化和结构测定提供依据．     

Isolation and Characterization of a New Subspecies of Aeromonas salmonicida （ Aeromonas salmonicida subsp, flounderacida subsp. nov. ） from Stone Flounder（ Kareius bicoloratus L. ）

Biological properties were studied to appropriate pathogenic bacteria which were isolated from diseased (or dead) stone flounder (Kareius bicoloratus L. ) which expressed bacterial septicaemia, including morphological characteristics, colony characteristics, physiological and biochemical characteristics and serum homology of isolates, the results showed that the isolates belonged to a new subspecies of A. salmonicida. In addition, the representative strains have been re-checked and detected the mol% G C ratio of the DNA by China Center for Type Culture Collection (CCTCC), the examined strains were also regarded as a new subspecies of A. salmonicida, and designated as Aeromonas salmonicida subsp, flounderac/da subsp, nov. by its isolated fish (Kareius bicoloratus ). Molecular identification of analysis of the nucleotide sequence of the 16S rRNA gene were applied, the results showed high similarity (99%) with the 16S rRNA gene of Aeromonas salmonicida from GenBank database. Cluster analysis of phylogenetic tree revealed that the representative strain formed separately bootstrap-supported cluster.     

黑向日葵籽壳天然色素的提取及理化性质研究

本文报道了从一种贵州独特的黑向日葵籽壳中提取的天然红色素，实验表明该色素属花色苷类色素，并对其理化性质进行了研究。     

The Surface Properties and Tensile Strength of HSPE Fiber Treated by Controlling Oxidation in Chromic Acid

This work reported on the surface modification of high strength polyethylene(HSPE)fiber by chemical etching in chromic acid.The surface chemistry,the functional group contents, the wetting ability, the surface morphology and the tensile strength of modified fibers were investigated. The results show that, the surface roughness,surface wet properties and active functional group can be introduced on the HSPE fiber surface by this method,which will improve the interface adhesion in the composites, and the decrease of the tensile strength of modified fibers can be controlled.     

石墨烯-半导体复合催化剂性能增强研究

采用原位还原方法首先合成了石墨烯-半导体复合催化剂,光催化性能评价表明复合后的ZnO光催化性能增强了5倍.光电化学测试数据证明ZnO和石墨烯的相互作用提高了光致电子和空穴的分离效率.     

GCr15钢超塑形变热处理后的组织与性能

本文对GCr15钢超塑形变热处理后的组织与性能进行了分析。分析表明,GCr15钢超塑形变淬火得到细小的马氏体组织,其亚结构为以高密度位错加孪晶的混合结构,碳化物体积份数增多,残余奥氏体量增多。力学性能试验表明,该钢的多冲寿命成倍提高,抗弯强度提高67％,耐磨性也明显提高。     

普通高校体育教学与终身体育的刍议

高校体育是学校体育的最后环节,是联系体育社会化与终身体育的纽带.在以教师为主导和学生为主体的体育教学中,改变旧的教学模式,开设选修课,培养学生的体育兴趣、体育意识,建立终身体育的思想,对实施终身体育具有重要作用.     

Structure sensitive properties of KTP-type crystals

Adding various dopants during the growth of the parent KTiOPO4 (KTP) crystal has given rise to an extensive series of KTP-type crystals. The doped KTP or KTP-type crystals often have very subtle structural variations from pure KTP crystals. As a result of these structural changes the KTP-type crystals often exhibit different physical properties, which may be referred to as structure sensitive properties. It is possible to fine-tune the nonlinear optical properties of KTP crystals through doping. This results in a broad range of applications for KTP-type crystals.