L-酪氨酸模板仿生合成MnO2及其催化性能的研究

以MnSO4和NaOH为原料,利用L-酪氨酸为模板仿生合成MnO2,SEM表征表明其形貌呈片状,XRD表征表明其为β-MnO2.研究MnO2催化甲基橙氧化降解性能,考察其对H2O2降解甲基橙模拟废水的催化能力,并利用SAS统计软件（SAS Institute Inc.,Cary,NC,USA,Version 8.0）对MnO2添加量、甲基橙溶液初始质量浓度和甲基橙溶液初始pH进行了优化.其优化后的试验结果为甲基橙溶液初始pH为4,甲基橙溶液初始质量浓度为9mg/L,MnO2添加量为0.42g/L.     

水热合成TiO2纳米棒及其光催化降解甲基橙研究

以锐钛矿TiO2粉末为原料,采用水热法合成了Ti02纳米棒,并利用X射线粉末衍射仪(XRD)、透射电子显微镜TEM等手段对产品进行了表征.以甲基橙为模拟染料废水,TiO2纳米棒为催化剂,在紫外光照条件下考察TiO2纳米棒的投加量、甲基橙的初始浓度、光照时间、溶液pH值及重复使用次数对甲基橙光降解效率的影响。实验结果表明:TiO2纳米棒的投加质量浓度为0.2g/L,甲基橙初始浓度为10mg/L,pH为5～6;光催化反应3h后,甲基橙的降解率可达96.5%;TiO2纳米棒重复使用5次后,甲基橙的降解率仍然可达85.6%.     

高效脉冲放电协同TiO2处理染料废水

采用自主研制的高压灭弧旋转火花隙开关,运用高压脉冲低温等离子技术,考察了峰值电压、初始放电电容、溶液初始pH值及TiO2的添加量对甲基橙模拟废水去除率的影响.实验表明:甲基橙的去除率随峰值电压的增大而增大,能量效率随初始放电电容的增大而提高,且TiO2的添加有效地提高了降解效率.当电源电压为13kV,pH为2时,通气处理10min,甲基橙的去除率可达96%以上.     

TiO2光催化氧化降解偶氮染料

研究了催化剂,光源、溶液初始浓度、溶液初始pH值等因素对甲基橙光催化氧化降解反应的影响.实验结果表明,最佳实验条件为:以灼烧的TiO2为催化剂,催化剂的投加量为0.8g.L-1,采用浸没式紫外灯作光源,甲基橙初始浓度为20mg·L-1,溶液初始pH=3.该实验条件下,甲基橙一小时脱色率可达81.3%.该研究可为偶氮染料降解提供新的思路.     

膨胀石墨负载氮掺杂二氧化钛降解甲基橙的光催化性能

采用溶胶-凝胶法制备了膨胀石墨负载TiO2和负载氮掺杂TiO2(N-TiO2)光催化剂,用XRD和SEM对样品进行表征,并以甲基橙溶液为目标降解物进行光催化性能的评价。结果表明:纳米TiO2可牢固地负载在膨胀石墨表面和层间,当达到吸附平衡后,煅烧温度为500℃条件下制备的膨胀石墨负载N-TiO2光催化剂在加入量为10 g/L、反应时间60 min的条件下,对初始浓度为15 mg/L的甲基橙溶液的降解率达到95.2%。     

纳米TiO2／壳聚糖催化超声降解甲基橙溶液

采用实验室合成的纳米TiO2／壳聚糖为催化剂,超声降解甲基橙水溶液,研究了各种因素对甲基橙超声降解的影响。研究表明在纳米TiO2／壳聚糖催化下甲基橙超声降解的效果非常明显,在超声波频率40kHz,催化剂用量1．0g／L,pH为7.0,甲基橙溶液初始浓度25mg／L的条件下,60min降解率即可达到90％以上。因此,纳米TiO2／壳聚糖催化超声降解有机污染物的方法具有很好的应用前景。     

β-环糊精聚合物／二氧化钛有机-无机杂化材料的制备及其光催化性能的研究

通过烯丙基-β-CD与丙烯酸 (AA) 的共聚合反应在环糊精聚合物链中引入活性基团羧基,运用溶胶-凝胶法制备了新型的环糊精聚合物P(CD-co-AA)/TiO2有机-无机杂化材料.通过FT-IR表明杂化材料中有机无机两相间存在着化学键;SEM证明有机无机两相高度相容;TGA证明热稳定性能有大大的提高. 通过光催化降解甲基橙实验证实杂化材料P(CD-co-AA)/TiO2的光催化效率是TiO2的2.6倍. 考查了催化剂用量、甲基橙溶液的初始浓度和初始pH值对材料光催化性能的影响. 实验证明当溶液的初始浓度为4 mg/L和初始pH=2及催化剂用量为0.8 g/L时,杂化材料表现出更为优良的光催化性能.     

改性TiO2的制备及其光催化性能研究

以钛酸四丁酯为前驱体,利用溶胶-凝胶法制备了不同掺铁量的改性纳米Ti02光催化剂,用XRD表征了其结构特征,并以甲基橙为目标降解物,评价了改性后纳米TiO2的光催化性能。结果：掺铁质量分数为0.03％的TiO2光催化活性最高;当甲基橙的初始浓度为16mg／L、掺铁0.03％TiO2的投加量为1.2g／L、pH值为3时,40w紫外灯照射210min,甲基橙的去除率高达95％以上。     

TiO2/浮珠负载型光催化剂的制备及其光催化性能

为提高光催化降解印染废水的效率,以空心结构微珠(浮珠)为载体,将TiO2溶胶-凝胶负载于表面,制备一系列不同焙烧温度、不同负载次数、具有高催化性能的负载型光催化剂.通过对甲基橙溶液光催化降解实验,研究了焙烧温度、负载次数、甲基橙溶液的初始质量浓度对光催化性能的影响.实验结果表明:500℃焙烧、负载4次时制得的负载型光催化剂催化活性最高,光照反应120 min5、mg/L的甲基橙溶液降解率为69%;降低甲基橙溶液初始质量浓度,其降解速率明显提高.     

自制纳米TiO2光催化剂对水中甲基橙的降解

以硫酸氧钛(TiOSO4)为原料,制备了掺银的纳米TiO2光催化剂.将该催化剂用于甲基橙溶液的降解试验,考查了掺银量、催化剂加入量、溶液pH值、溶液浓度对降解率的影响.结果表明:在浓度为10 mg/L的甲基橙溶液(pH=3)中,投加6.0 g/L掺银量为5%的光催化剂时降解率为78.1%.表明用掺杂的纳米TiO2光催化剂处理水中的有机物是一条有效的途径.     

重组小鼠14-3-3蛋白theta亚型的构建

目的 克隆编码14-3-3蛋白质θ亚型的cDNA,制备该蛋白质的基因重组蛋白质.方法 参照小鼠14-3-3蛋白质θ亚型mRNA结构设计引物,以小鼠脑总RNA为模板,RT-PCR法克隆编码14-3-3蛋白质θ亚型的cDNA,插入原核表达质粒pGEX-4T-1,转化大肠杆菌BL21(DE3)使其表达谷胱甘肽S转移酶(GST)为标签的融合蛋白质,以凝血酶定点分解融合蛋白并采用Glutathione Sepharose 4B亲和层析纯化目的 蛋白.结果 RT-PCR扩增产物经1%琼脂糖凝胶电泳分离可见约800 bp条带,序列分析表明重组质粒pGEX-1433theta中的插入子为738 bp,编码245个氨基酸,其核苷酸及氨基酸序列与Pubmed NM-011739展示的结果一致.重组质粒pGEX-1433theta在BL21(DE3)中的表达量随IPTG诱导时间递增,融合蛋白质为可溶性组分.亲和层析纯化的14-3-3theta在SDS-PAGE上表现为单一条带,表观相对分子质量为30 ku.每L培养菌液可收获4mg基因重组型小鼠14-3-3theta.结论 克隆了编码小鼠14-3-3蛋白质θ亚型的cDNA,制备了高纯度基因重组型小鼠14-3-3theta,为进行单克隆抗体的制备奠定了坚实的基础.     

Auto CAD R14的基于特征的三维实体建模

提出在ＡｕｔｏＣＡＤＲ１４版上进行实体模型构成的方法。基本出发点为：以物体的几何特征为基础，绘制三维实体模型，从而自动生成所需的二维视图     

禾谷炭疽菌14-3-3蛋白生物信息学分析

禾谷炭疽菌侵染玉米、小麦等粮食作物而引起的炭疽病,给各国农业生产造成了巨大经济损失.14-3-3蛋白普遍存在于真核生物,参与植物众多生理生化过程.本研究基于酿酒酵母中2个典型14-3-3蛋白序列,利用Blastp以及关键词对炭疽菌属蛋白质数据库进行比对、搜索,以及通过SMART保守结构域分析,明确该菌存在2个典型的14-3-3蛋白;同时,通过对上述蛋白进行二级结构、疏水性、信号肽,跨膜结构域以及亚细胞定位等生物信息学分析.该研究为深入开展禾谷炭疽菌14-3-3蛋白功能研究打下坚实的理论基础.     

层状磷锑酸钾微波固相合成和表征

两类不同反应物使用微波固相合成法均得到层状磷锑酸钾,采用ＸＲＤ、ＩＲ、ＴＧＡ和指标化程序对其进行了表征,结果表明磷锑酸钾属六方晶系ａ＝０．７１ｎｍ,ｃ＝３．０８ｎｍ层间距为１０．３ｎｍ,晶体结构中含有结晶水。     

14-3-3sigma controls mitotic translation to facilitate cytokinesis

14-3-3 proteins are crucial in a wide variety of cellular responses including cell cycle progression, DNA damage checkpoints and apoptosis. One particular 14-3-3 isoform, sigma, is a p53-responsive gene, the function of which is frequently lost in human tumours, including breast and prostate cancers as a result of either hypermethylation of the 14-3-3sigma promoter or induction of an oestrogen-responsive ubiquitin ligase that specifically targets 14-3-3sigma for proteasomal degradation. Loss of 14-3-3sigma protein occurs not only within the tumours themselves but also in the surrounding pre-dysplastic tissue (so-called field cancerization), indicating that 14-3-3sigma might have an important tumour suppressor function that becomes lost early in the process of tumour evolution. The molecular basis for the tumour suppressor function of 14-3-3sigma is unknown. Here we report a previously unknown function for 14-3-3sigma as a regulator of mitotic translation through its direct mitosis-specific binding to a variety of translation/initiation factors, including eukaryotic initiation factor 4B in a stoichiometric manner. Cells lacking 14-3-3sigma, in marked contrast to normal cells, cannot suppress cap-dependent translation and do not stimulate cap-independent translation during and immediately after mitosis. This defective switch in the mechanism of translation results in reduced mitotic-specific expression of the endogenous internal ribosomal entry site (IRES)-dependent form of the cyclin-dependent kinase Cdk11 (p58 PITSLRE), leading to impaired cytokinesis, loss of Polo-like kinase-1 at the midbody, and the accumulation of binucleate cells. The aberrant mitotic phenotype of 14-3-3sigma-depleted cells can be rescued by forced expression of p58 PITSLRE or by extinguishing cap-dependent translation and increasing cap-independent translation during mitosis by using rapamycin. Our findings show how aberrant mitotic translation in the absence of 14-3-3sigma impairs mitotic exit to generate binucleate cells and provides a potential explanation of how 14-3-3sigma-deficient cells may progress on the path to aneuploidy and tumorigenesis.     

重组盐藻14-3-3蛋白基因的原核表达及分离纯化

根据克隆的杜氏盐藻14-3-3蛋白的基因序列设计引物,采用RT-PCR方法扩增杜氏盐藻14-3-3蛋白的基因.经原核表达、Ni2+亲和层析法纯化,免疫动物制备抗体. 抗体蛋白质印迹分析检测结果表明抗体能特异结合盐藻细胞分子量为29 kD的多肽.     

东亚三角涡虫Dj14-3-3ε原核表达及鉴定

从东亚三角涡虫cDNA文库中挑选出克隆M455,经BLASTP确定隶属于14-3-3ε基因家族,具有14-3-3蛋白的保守结构域命名为Dj14-3-3ε基因.该基因含有完整的最大开放阅读框(ORF),编码蛋白约10.7 kDa.构建pET28b-Dj14-3-3ε原核表达载体,通过IPTG诱导在大肠杆菌中表达,western blot鉴定,表明原核表达载体构建成功,并在大肠杆菌中正常表达.     

Microstructure Study of Ti-24Al-14Nb-3V Alloy

The microstructure of Ti-24Al-14NB-3V intermetallic alloy with solution treated was investigated by trans mission electron microscopy (TEM) and selected area electron diffraction (SAD) in conjunction with X-ray energy dispersive spectroscopy (EDS) techniques. It shown that φ=50% ductile β₀-phase and small amount of O phase,and α₂ with the number of dislocations having c-component resulted in increasing slip system of the material, have contributed to a good combination of strength and ductility at room temperature. Owing to some reciprocal planes of similarity between α₂ and O Phases, to distinguish both of two phases, a series of diffraction patterns obtained by tilting around one reciprocal direction of the phase are needed based on the systematic extinction and reciprocal planes sequences occurred in the diffraction patterns, if those patterns are not containing one of three reciprocal unit vectors, a*, b*, c* in terms of the crystal unit cell, a, b, c.     

Inhibition of blue-light-dependent binding of 14-3-3 proteins to phototropins by hydrogen peroxide

Phototropins, following the discovery of phytochromes and cryptochromes, are the most recently characterized blue-light (BL) receptors in plants. The Nterminal regions of the proteins contain two light oxygen and voltage (LOV)--LOV1 and LOV2, which belong to PAS domain involved in protein-protein interaction and ligand binding,