18—钨—2—砷杂多酸稀土盐合成与性质研究

本文采用复分解法,首次合成出Ln_2As_2W(18)O_(62)xH_2O(Ln:La,Ce,Nd,Sm,Gd.)系列杂多酸稀土盐,紫外吸收光谱、红外吸收光谱、x—射线粉末衍射分析都证明所合成产物具有Dawson结构,用差热——热重分析及溶液分光光度等手段,研究了合成产物的热性质和水溶液的酸碱稳定性。     

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。     

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.     

Transformation of the salt-tolerant gene of<Emphasis Type="Italic">Avicennia marina</Emphasis> into tobacco plants and cultivation of salt-tolerant lines

Salt-tolerant gene, CSRG1, which was isolated from a kind of salt-tolerant mangroves, Avicennia marina, constructed the transgenic plasmid, pGAM189/CSRG1. CSRG1, GUS, Kmr and Hyg^r could be transferred into tobacco genome by the ameliorated leaf discs method of agro-bacterium-mediate transformation. Thirteen stable resistant lines were obtained when fifty transgenic explants were selected through 50 mg/L hygromycin and 150 mg/L kanamycin. Assessments of PCR amplification, Southern blot analysis and GUS histochemical staining showed that CSRG1 has been integrated into the genome of the eleven transgenic lines (frequency of transformation was 22%). Northern bolt analysis revealed that CSRG1 had expressed in transgenic lines. The assessments of salt-tolerant ability and photosyn-thetic rates indicated that the survival rate of the transgenic lines is 80%—90% and the transgenic lines could increase by 30%—40% in plant height, even when they were cultivated in MS medium containing 2% NaCl and the total seawater (salinity 24). It is supposed that the special physiologic metabolic pathway formed by the products of CSRG1 can really endow the tobacco plants with the high salt-tolerant ability, not only to Na^ stress, but also to the comprehensive stress of various ions.     

Mathematical modeling of salt-gradient ion-exchange simulated moving bed chromatography for protein separations

The salt-gradient operation mode used in ion-exchange simulated moving bed chromatography (SMBC) can improve the efficiency of protein separations. A detailed model that takes into account any kind of adsorption/ion-exchange equilibrium, salt gradient, size exclusion, mass transfer resistance, and port periodic switching mechanism, was developed to simulate the complex dynamics. The model predictions were verified by the experimental data on upward and downward gradients for protein separations reported in the literature. All design and operating parameters (number, configuration, length and diameter of columns, particle size, switching period, flow rates of feed, raffinate, desorbent and extract, protein concentrations in feed, different salt concentrations in desorbent and feed) can be chosen correctly by numerical simulation. This model can facilitate the design, operation, optimization, control and scale-up of salt-gradient ion-exchange SMBC for protein separations.     

生长时间对ZnO纳米棒形貌和光学性能的影响

在低温条件下，利用化学溶液沉积法（CBD）成功在Si（100）衬底上生长出近一维ZnO纳米棒阵列．采用X射线衍射（XRD），扫描电子显微镜（SEM）和光致发光谱（PL）对样品进行结构、形貌和光学性能分析．结果表明：产物为结晶良好的六角结构晶体．随着生长时间的增加，ZnO纳米棒的尺寸随之增大．PL测试表明产物有较好的光致发光性能，并且随着纳米棒尺寸的减小，紫外发射峰发生蓝移现象．     

融盐包裹法合成球形正极材料LiNi_(0.7)Co_(0.2)Al_(0.1)O_2(英文)

以球形Ni(OH)2为核心原料,Al(NO3)3.9H2O、Co(NO3)2.6H2O和LiNO3为包裹原料,采用融盐包裹法在空气中煅烧合成了单相固溶体LiNi0.7Co0.2Al0.1O2。用XRD研究了合成产物的物相和结构,用SEM研究了合成产物的形貌,用电池性能测试仪研究了合成产物的电化学性能。实验结果表明,合成产物具有α-NaFeO2型层状有序结构、球状形貌和良好的电化学性能。     

生质柴油碱性均匀相触媒制程研究

生质柴油为重要之可再生能源。本文研究改善液相触媒制程,以降低甲醇与三酸甘油酯间界面阻力,以提生反应速率。实验结果发现,在批式制程中,提高搅拌速率可提升反应速率,然因工厂实际操作恐有困难。以相转移触媒可达增加反应速率与产率效果,但需注意选用之相转移触媒不可在强碱下被破坏。使用共溶剂THF可促进反应速率与产率,为一可行的选择。而连续制程较批式制程有较好的效率。     

论班级凝聚力对高职生个性发展的重要意义

本文以对高职生班级环境的现状调查为基础,结合高职生的成长经历和未来发展论述了提高班级凝聚力对高职生个性发展的重要意义以及提高班级凝聚力的基本要素。     

盐分胁迫对绿豆幼苗若干生理生化指标的影响

实验采用水培的绿豆幼苗,模拟水分的积盐状况,用不同浓度的NaCl溶液作为渗透胁迫剂,分别用2%,4%,6%NaCl溶液对绿豆幼苗进行处理,观察其生长状况,测定其平均植株高度,脯氨酸含量。结果显示,随着盐分浓度的升高,绿豆幼苗伤害加重,生长状况不断恶化,植株平均株高降低,叶片及根中的脯氨酸含量均呈递增状况。