Study on sensing properties of tin oxide CO gas sensor with low power consumption

In this paper, the fabrication method of a new type of carbon monoxide gas sensor based on SnOx with low power consumption and its sensing characteristics have been reported. The electric conductance of this type of sensor evolves oscillation form regularly when the sensor is exposed to low level of CO gas. The oscillation amplitude is directly proportional to the concentration of CO gas over a wide range. The effects of relevant factors. such as. humidity, temperature and interference gases on the sensor properties were examined. The sensing oscillation response mechanism was also discussed.

Encapsulation of Eu(TTA)(3) into MCM-41 mesoporous molecular sieve by sol-gel method

The rare earth complex Eu(TTA)(3) was successfully encapsulated into MCM-41 mesoporous molecular sieve by the addition of the complex into the sol-gel mixture for the synthesis of MCM-41 mesoporous material under microwave radiation. The as-synthesized MCM-41-hosted Eu(TTA)(3) mesophase was confirmed to possess hexagonally ordered mesostructure and a uniform crystal. size of about 30 nm with XRD and HRTEM techniques. Moreover, the IR spectrum, photoluminescence effect and fluorescence lifetime of the Eu(TTA)(3)/MCM-41 hybrid were also studied. An increase in Stokes' shift and no change in luminescence lifetime were observed to the resultant mesophase in comparison with Eu(TTA)(3) in ethanol solution.

表面等离子体共振免疫传感的放大检测研究

表面等离子体共振免疫传感器是一类相对新型的免疫检测技术。将链霉亲和素 生物素系统用于表面等离子体共振免疫传感的信号放大 ,实时检测了人免疫球蛋白G(hIgG)的蛋白浓度。发生免疫反应的传感片和生物素化抗体反应后 ,传感片表面的一层生物素分子随后与链霉亲和素 生物素化抗体复合物中的链霉亲和素的活性位点发生亲和反应 ,从而使传感片表面特异健合的物质质量显著增加 ,大大提高了免疫检测的灵敏度和检测限。免疫反应经放大后 ,可检测 0 0 0 5～ 10 μg/mL浓度区间内的hIgG

Photochromism in CaS : Sm

The photochromism in CaS:Sm (from white to pink) was observed for the first time by exposing it to ultraviolet light. The experiments results show that the absorption intensity of Sm2+ in the range of 500 similar to 600nm was strongly increased after irradiation. This reveals that there is the valence changing of Sm. If the sample was excited by visible light again, the pink color turned to white, indicating that CaS:Sm has potential application in the field of storage material.

Study on the structure and miscibility of PBPI-E/PTI-E blends

The crystallization, miscibility and structure of polyimide PBPI-E/PTI-E blends were studied by DSC, DMA, NMR and fluorescence techniques, where PBPI-E is a biphenyldianhydride-based polyimide, and PTI-E is a polyimide from 4,4'-thiodiphthalic anhydride and 4,4'-oxydianiline. The results obtained show that PBPI-E/PTI-E blends are miscible at a molecular level for all the compositions studied. However, the glass transition temperature of the blends is well below the value predicted by the Fox equation, and the blends are not stable at high temperature, i.e. phase separation will occur when the blends are annealed about T-g. Moreover, the melting point T-m, differential enthalpy Delta H and spin-lattice relaxation time T-l(c) of the blends increase with the annealing time. (C) 1997 Elsevier Science Ltd. All rights reserved.

Relationship between the dissolution behaviours and current efficiencies of La, Ce, Pr and Nd in their chloride molten salts

The dissolution behaviours of La and Nd in their chloride molten salts were studied by means of the see-through cell, electrochemical weak polarization and quantum chemistry (extended Huckel molecular orbital). The reasons for the low current efficiencies of rare earth metals and the difference between La and Nd in their own chloride electrolytes on the basis of the solubility, rate of dissolution, and existing state of the metals dissolved as well as the structure of the melts, are discussed.

电解液添加成份对贮氢电极性能影响的初步研究

电解液添加成份对贮氢电极性能影响的初步研究蔡称心，黄翠虹（南京大学化学系，南京，２１０００８）王宝忱（中国科学院长春应用化学研究所，长春１３００２２）关键词：贮氢电极，ＭＨ／Ｎｉ电池，添加剂自从Ｊｕｓｔｉ和Ｅｗｅ￣［１，２］发现贮氢合金能够用电化学方...

[(O)MoCu_3(μ_3-S)_3(μ_3-Cl)(PPh_3)_3]·2THF的合成及其晶体结构

固体化合物(NH_4)_6Mo_7O_(24)·4H_2O和(PPh_3)_2CuCl与饱和液体NH_4HS反应获得桔红针状标题晶体。晶体空间群为P2_1/c,晶胞参数a=11.742(2),b=28.186(7),c=19.304(3),β=100.57(2)°,V=6280.4(?)~3,D_c=1.46g/cm~3,Z=4,F(000)=2816。在3≤2θ≤45°范围内收集到8414个独立衍射强度数据,其中3856个I≥1.5σ(I)强度数据参加结构计算。标题化合物分子是以{MoCu_3S_3Cl}类立方烷型簇为核心的分子,Mo—Cu的平均距离为2.716。

重稀土离子电极的研制及其应用

稀土分离流程中,需要能随时测定稀土含量而又简便的分析方法,离子选择电极可能适应这种需要。我们在稀土电极研究的基础上,研制了重稀土离子选择电极,并以该电极膜制成重稀土流通池,将其应用在流动注射分析中,可能是重稀土分析中较理想的方法之一。1 主要仪器和试剂 主要仪器有PW 9409酸度计(Philips),FlA-T_2通用流动注射仪(东北电力学院仪器仪

A NOVEL METAL THIAMINE COMPLEX WITH A CYCLIC DIMER FORMED BY METAL-BRIDGED 2 THIAMINE LIGANDS - CRYSTAL-STRUCTURE OF [MN(THIAMINE)CL2(H2O)]2[THIAMINE]2CL4.2H2O

The crystal structure of [Mn(thiamine)Cl2(H2O)]2[thiamine]2Cl4.2H2O has been determined by X-ray diffraction methods. The compound contains a cyclic dimer of a complex cation with two thiamine ligands bridged by two Mn(II) ions across a crystallographic center of symmetry. Each Mn(II) is coordinated by two chloride atoms, a water molecule, a N(1') atom of the pyrimidine from a thiamine and an O(53) atom of the hydroxyethyl side chain from another thiamine. There are two free-base thiamine molecules related by a center of symmetry in the unit cell, which form a base-pair through the hydrogen bonds. Both the independent thiamine molecules in the asymmetric unit assume the common F conformation with phi-T = 10.0(9) and 3.6(10) and phi-P = 85.6(7) and 79.6(7), respectively. The compound provides a possible model for a metal-bridged enzyme-coenzyme complex in thiamine catalysis. Crystallographic data: triclinic, space group P1BAR, a = 12.441(4), b = 13.572(4), c = 11.267(3) angstrom, alpha = 103.15(2), beta 89.03(3), gamma = 115.64(2)-degrees, Z = 1, D(calc) = 1.524 g cm-3, and R = 0.050 for 3019 observed reflections with I > 3-sigma(I).

稀土配合物导数吸收光谱研究Ⅳ.Ln~(3+)-Ferron-Triton X-100配合物导数光谱的研究及其应用

具有f-f超灵敏跃迁的稀土配合物导数吸收光谱可大幅度提高稀土元素的测定灵敏度,钕-高铁试剂(Ferron,7碘-8羟基喹啉-5-磺酸)即为此类配合物,但其测定灵敏度提高不多。研究发现,在Ln~(3+)(Pr~(3+)、Nd~(3+)、Er~(3+))-Ferron体系中加入表面活性剂可形成新的配合物,使其f-f超灵敏跃迁吸收谱线增强,峰形显著变化,其中钕和铒的吸收峰

VTMS与Bz、St及HFP等离子体共聚物的性能研究

采用外部电极电容耦合的RF辉光放电装置,对乙烯基三甲基硅烷(VTMS)与苯(Bz)、苯乙烯(St)以及六氟丙烯(HFP)进行共聚合。通过IR、TG、防潮试验、接触角测试研究了共聚物膜的性能。发现VTMS与Bz、St的共聚物膜具有优良的防潮性。

Proteomic analysis of differentially expressed proteins in lymphoid organ of Fenneropenaeus chinensis response to Vibrio anguillarum stimulation

To gain an insight into the function of shrimp lymphoid organ at protein level, we analyzed the proteome of lymphoid organ in healthy Chinese shrimp Fenneropenaeus chinensis (F. chinensis) through two-dimensional gel electrophoresis (2-DE) based proteomic approach. A total of 95 spots representing 75 protein entries were identified by liquid chromatography tandem mass spectrometry (LC-MS/MS) with both online and in-house database. According to Gene Ontology (GO) annotation of biological process, the identified proteins were classified into 13 categories. Among them, approximately 36% of proteins related to cytoskeleton are noticeable. Then, a comparative proteomic approach was employed to investigate the differentially expressed proteins in lymphoid organ of Vibrio anguillarum-challenged F. chinensis. At 24 h post-injection (hpi), 17 differentially expressed protein spots were successfully identified, including 4 up-regulated protein spots (represent 4 proteins: cathepsin L protein similar to squid CG16901-PC, protein kinase C and protein similar to T-complex Chaperonin 5 CG8439-PA), and 13 down-regulated protein spots (represent 9 proteins: actin, beta-actin, cytoplasmic actin CyII, alpha tubulin, beta tubulin, protein similar to proteasome delta, vacuolar ATP synthase subunit B, elongation factor 2, carboxypeptidase B). These data may help us to understand the function of lymphoid organ and the molecular immune mechanism of shrimp responsive to pathogen infection. (C) 2010 Elsevier Ltd. All rights reserved.

QTL Mapping for Frond Length and Width in Laminaria japonica Aresch (Laminarales, Phaeophyta) Using AFLP and SSR Markers

In Laminaria japonica Aresch breeding practice, two quantitative traits, frond length (FL) and frond width (FW), are the most important phenotypic selection index. In order to increase the breeding efficiency by integrating phenotypic selection and marker-assisted selection, the first set of QTL controlling the two traits were determined in F-2 family using amplified fragment length polymorphism (AFLP) and simple sequence repeat (SSR) markers. Two prominent L. japonicas inbred lines, one with "broad and thin blade" characteristics and another with "long and narrow blade" characteristics, were applied in the hybridization to yield the F-2 mapping population with 92 individuals. A total of 287 AFLP markers and 11 SSR markers were used to construct a L. japonica genetic map. The yielded map was consisted of 28 linkage groups (LG) named LG1 to LG28, spanning 1,811.1 cM with an average interval of 6.7 cM and covering the 82.8% of the estimated genome 2,186.7 cM. While three genome-wide significant QTL were detected on LG1 (two QTL) and LG4 for "FL," explaining in total 42.36% of the phenotypic variance, two QTL were identified on LG3 and LG5 for the trait "FW," accounting for the total of 36.39% of the phenotypic variance. The gene action of these QTL was additive and partially dominant. The yielded linkage map and the detected QTL can provide a tool for further genetic analysis of two traits and be potential for maker-assisted selection in L. japonica breeding.

海湾扇贝遗传图谱构建及壳色基因、生长相关QTL的定位研究

本研究利用AFLP和微卫星标记，以海湾扇贝杂交F1为作图群体，构建了海湾扇贝的遗传连锁图谱，并对壳色决定基因和与生长性状相关的QTL进行了定位。 共用55对AFLP引物组合对亲本和88个子代个体进行扩增，共得到了2424个位点，多态性位点为392个，占所有标记的16.17％。其中，母本标记121个，父本标记196个，共有标记75个。经卡方检验，共有331个标记（84.4%）符合孟德尔分离比，61个标记（15.6％）出现偏分离现象。偏分离标记中，36个（59％）为纯合子缺失。从35对微卫星引物中筛选出了10对多态性引物，得到了5个母本标记和6个父本标记。另外，将表现为质量性状的壳色标记作为形态标记一同进行连锁图谱构建。 分别利用母本和父本标记构建了海湾扇贝雌性和雄性连锁图谱。其中，共有包括109个AFLP标记、5个微卫星标记和1个壳色标记组成了雌性图谱的框架图，分布于16个连锁群。图谱总长度为338.8cM，平均间隔为5.29cM，图谱覆盖率为65.82％。雄性连锁图谱框架图共定位了186个标记，包括181个AFLP标记、5个微卫星标记，壳色标记未实现定位。图谱包括17个连锁群，总长度为780.3cM，平均间隔为6.56cM，图谱覆盖率为78.11％。通过SSR12位点的定位结果，可以将雌性图谱第7连锁群与雄性图谱17连锁群对应起来。 壳色标记定位在了雌性图谱第九连锁群上，说明橙色基因位点为杂合。我们将壳色基因命名为Orange1，两个标记——F1f335和D8f420与这一基因之间图距为0。在家系和群体中初步验证，这两个标记与壳色基因紧密或完全连锁。 共定位了16个与生长相关的QTL，它们分布于雌性图谱的2、3、5连锁群和雄性图谱的4、5、6、7、8连锁群上。每个QTL均发现了与其图距非常接近的分子标记（0.01-2.51％）。其中壳长、壳高、壳宽三个长度指标QTL成簇分布或部分重叠，可一同作为选择性指标，壳重和全湿重QTL位点也比较相近。只有软体部重位点单独分布，可能具有相对独立的遗传基础。