Chronology and origin of VMS deposits in Xinjiang,NW China

VMS deposits in Xinjiang, NW China are widespread in the Altay, Tianshan and West Kunlun orogenic belt, mainly formed during the Proterozoic rifting and Phanerozoic post-orogenic extension and are related to the bimodal volcanism. The VMS deposits are middle and small in scale. According to assemblages of metallogenetic elements, they can be divided into four types (Cu-Zn, Cu-S, Pb-Zn-Cu and Pb-Zn types) with the Cu-Zn and Pb-Zn types being the most important ones. Research of isotopic chronology shows that the VMS deposits in Xinjiang were formed during the Proterozoic, Ordovician, Deovonian, Carboniferous and Permian periods and usually underwent multi-stage mineralization, especially the large-sized deposits usually have post-volcanic superimposed mineralization by tectonomagmatic or metamorphic hydrothermal metal-logenic fluids.     

咪唑-1-羟酸酯类化合物的构效关系研究

利用CoMFA方法，对20种咪唑-l-羧酸酯类化合物进行了三维定量均效关系研究．研究结果表明，影响其药效的主要因素是空间结构．得到了具有较强预测能力的QSAR模型．在此基础上，设计了高活性的化合物，并发现了分子中存在着明显的芳环堆积现象，可能和对受体的识别有关．     

Chronology and origin of Au-Cu deposits related to paleozoic intracontinental rifting in West Tianshan Mountains,NW China

Located between the Tarim platform and Junggar massif, the West Tianshan intracontinental rift abuts against the China-Kazakhstan boundary in the west part, borders on the Yilianha-bierga late Paleozoic relic ocean basin and the South Tianshan late Paleozoic ocean basin respectively in the northeast separated by the Aibi Lake fault and in the southeast by the fault along the southern margin of the Yili massif. During the development and after the close of the West Tianshan intracontinental rifting in the Carboniferous-Permian period, a series of nonferrous and precious metal mineralizations occurred with the Au-Cu deposits being the most important. Isotopic chronologic study of representative deposits of different types shows that gold-copper mineralization in the West Tianshan intracontinental rift zone mainly happened during the middle-late Her-cynian Period, among which the Axi volcanic hydrothermal type gold deposit was formed during the Carboniferous with a fluid inclusion Rb-Sr isochron age of (339 ± 28) Ma; the Qiabukanzhuota quartzolite type gold deposit has a Rb-Sr isochron age of (312 ± 46) Ma; the Tawuerbieke porphyry type gold deposit has a Rb-Sr isochron age of (295 ± 16) Ma; the Jingbulak magmatic liquation Cu-Ni deposit and the Musizaote porphyry type Cu deposit have the forming ages of 300 Ma± and 250 Ma±, respectively. Analyses of crustal evolution and metallogenetic geological backgrounds of Au-Cu mineralizations in the studied area shows a close correlation with the rifting.

     

子种绿A与锡反应分光光度法测定痕量锡

探讨了在氨性介质中子种绿Ａ（Ｃ３７Ｈ３５Ｎ２Ｏ６Ｓ２Ｎａ） 染料与锡（ＩＶ） 反应形成离子缔合物的最佳条件,建立了测定痕量锡的新方法。子种绿Ａ—Ｓｎ（ＩＶ） 缔合物的最大吸收波长位于６３０ ｎｍ ,表观摩尔吸光系数ε６３０ ＝ １．７×１０６ Ｌ／（ｍｏｌ·ｃｍ）,锡浓度在０～８０ ｕｇ／Ｌ 范围内遵守比耳定律。用于水样与罐头食品分析,结果令人满意。     

Chronology and origin of Au-Cu deposits related to Paleozoic intracontinental rifting in West Tianshan Mountains, NW China

Located between the Tarim platform and Junggar massif, the West Tianshan intraconti-nental rift abuts against the China-Kazakhstan boundary in the west part, borders on the Yilianha-bierga late Paleozoic relic ocean basin and the South Tianshan late Paleozoic ocean basin re-spectively in the northeast separated by the Aibi Lake fault and in the southeast by the fault alongthe southern margin of the Yili massif. During the development and after the close of the WestTianshan intracontinental rifting in the Carboniferous-Permian period, a series of nonferrous andprecious metal mineralizations occurred with the Au-Cu deposits being the most important. Isotopicchronologic study of representative deposits of different types shows that gold-copper mineraliza-tion in the West Tianshan intracontinental rift zone mainly happened during the middle-late Her-cynian Period, among which the Axi volcanic hydrothermal type gold deposit was formed duringthe Carboniferous with a fluid inclusion Rb-Sr isochron age of (339 ± 28) Ma; the Qiabukanzhuotaquartzolite type gold deposit has a Rb-Sr isochron age of (312 ± 46) Ma; the Tawuerbieke por-phyry type gold deposit has a Rb-Sr isochron age of (295 ± 16) Ma; the Jingbulak magmatic liqua-tion Cu-Ni deposit and the Musizaote porphyry type Cu deposit have the forming ages of 300 Ma ±and 250 Ma±, respectively. Analyses of crustal evolution and metallogenetic geological back-grounds of Au-Cu mineralizations in the studied area shows a close correlation with the rifting.     

Racemic titanium(IV) complexes of salicylideneamino acids

New racemic complexes of titanium with Schiff bases derived from condensation of salicylaldehyde with dl-alanine (H₂Sal-dl-Ala) and dl-valine (H₂Sal-dl-Val) have been prepared. The crystal structure of [(Sal-dl-Val)₂Ti·CH₂Cl₂ bis(N-salicylidenevalinato)titanate(IV) CH₂Cl₂] has been solved by single-crystal X-ray diffraction methods; the crystal is a racemate consisting of a pair of enantiomers (Sal-d-Val)₂Ti and (Sal-l-Val)₂Ti. The Schiff-base ligand acts as a double negatively-charged tridentate ONO chelate, coordinated to the titanium atom. The geometry around titanium is a distorted octahedron. The i.r. and u.v.–vis. spectra of the complexes have been evaluated.     

INVESTIGATION ON THE CONFORMATION OF THE MAIN-CHAIN NEMATIC POLYMER BY SMALL ANGLE X-RAY SCATTERING

The experimental investigation on the conformation of a thermotropic main-chain nematic polymer by small-angle X-ray scattering (SAXS) has been carried out. The average radius of gyration of the polymer has been determined in nematic and isotropic state respectively. The experiment shows that the boundary between domains is not sharp but diffuse, and the diffuse-boundary thickness of the polymer as a function of temperature has been given.     

含有联苯和肉桂酸酯基团的侧链液晶共聚物的合成与表征

合成了两种含有联苯刚性基元的甲基丙烯酸酯单体M1和M2,其中M1为含有可光交联的肉桂酸酯端基的单体.通过溶液自由基聚合,得到一系列含不同比例M1和M2单体单元的聚丙烯酸酯类侧链液晶共聚物.采用1H-NMR、FT-IR等方法对单体和聚合物的结构进行了详细表征.用示差扫描量热法、偏光显微镜以及广角和小角X-射线衍射对单体和聚合物的液晶性进行了研究.结果表明,末端为肉桂酸酯基团的单体M1无液晶性,其均聚物P1有微弱的液晶性,而端基为正丁基的单体M2及其均聚物P9则表现出近晶相液晶行为.共聚物P2~P5均为向列型液晶,P6~P9则为近晶型液晶.随在聚合物中M2单体含量的增加,共聚物的玻璃化转变温度、熔点及清亮点温度均呈现增加趋势.     

Electrochemical aptasensor for the determination of bisphenol A in drinking water

We present an electrochemical aptasensor for rapid and ultrasensitive determination of the additive bisphenol A (BPA) and for screening drinking water for the presence of BPA. A specific aptamer against BPA and its complementary DNA probe were immobilized on the surface of a gold electrode via self-assembly and hybridization, respectively. The detection of BPA is mainly based on the competitive recognition of BPA by the immobilized aptamer on the surface of the electrode. The electrochemical aptasensor enables BPA to be detected in drinking water with a limit of detection as low as 0.284 pg?mL^?1 in less than 30 min. This extraordinary sensitivity makes the method a most powerful tool for on-site monitoring of water quality and food safety.

Immunochromatographic lateral flow strip for on-site detection of bisphenol A

We have developed a lateral flow assay (LFA) for the detection of bisphenol A (BPA) in water samples. Antibody against BPA was labeled with gold nanoparticles, and these conjugates were used as the recognition probes for the construction of an LFA strip. The diameter of the gold nanoparticles, the amount of antibody, the pH of the buffer, and the categories of the conjugation pad were optimized. The resulting method has a (visual) detection limit of 5 ppb, and of 0.92 ppb if used in combination with professional software. This LFA displays excellent specificity and was applied to spiked water samples with satisfactory results.