亚表面引发原子转移自由基聚合构筑温度响应型纳米纤维油水分离膜

亚表面引发聚合是一种用于制备共价嵌入型聚合物刷的新型改性策略.该方法在发展高稳定性聚合物刷功能化表界面材料方面具有显著的优势.本工作利用亚表面引发原子转移自由基聚合(sSI-ATRP)对静电纺丝聚丙烯腈(PAN)基纳米纤维膜进行亚表面改性,通过接枝聚N-异丙基丙烯酰胺(PNIPAM)制备了温度响应型纳米纤维油水分离膜(...     

一维Mn2+掺杂CdS纳米晶体的水热合成及其发光性能

用水热方法合成了一维Mn2 掺杂CdS纳米晶体.产品分别用SEM,EDS,XRD,TEM,HRTEM和PL等技术进行了表征.结果表明,掺杂Mn2 完全替代了CdS晶格中Cd2 的位置,产品具有较好的结晶性.荧光光谱中,CdS纳米晶体表面缺陷态的发射峰被完全抑制,只能观察到单一的Mn2 的发射峰.     

有机酸在电感耦合等离子体质谱中基体效应的研究

研究了乙二酸、乳酸、酒石酸和柠檬酸等有机试剂对不同质量和不同电离电位元素电感耦合等离子体质谱信号的影响。结果表明,随着雾化气流速的调节,低浓度有机酸介质对所分析元素具有增强效应,尤其是对电离电位在9～11 eV的Be,Zn,As,Se,Sb和Hg等高电离电位元素的影响。酒石酸的增强效应显著大于乙二酸、乳酸、柠檬酸。探讨了有机酸的增强机理。利用酒石酸对Be,Zn,As,Se,Sb和Hg等的增强特性,测定了水标准物质SRM 1640中的Be,Zn,As,Se,Sb和SRM 1641d中Hg,其测定结果与标准样品提供的标准值基本一致。     

聚乳酸组织工程支架结构的精密调控

采用糖球模板法结合热致相分离技术,制备了孔径尺寸、内连通度及孔隙率高度可控的左旋聚乳酸(PLLA)支架材料,并通过扫描电镜(SEM)、红外光谱(FTIR)以及示差扫描量热法(DSC)对其空间结构及性能进行了系统研究.支架材料孔径从50μm到800μm及内连通孔径从10μm到200μm连续可调,微观孔壁结构根据不同溶剂可形成各异的微纳米结构.支架的制备对PLLA化学结构无显著影响,但相分离过程会不同程度地降低PLLA的结晶度.     

“十三五”期间云南省重点优势产业的选择

本文使用云南省2014年的数据,采用因子分析法,结合云南省产业发展情况,依据产业增长潜力、产业带动能力和产业经济效益等7个标准,选取增加值规模、影响力系数和感应度系数等10个指标进行考察,最终确定生物医药产业、有色金属及新材料产业和汽车及高端装备制造业等产业为云南省"十三五"期间的重点优势产业。     

Effect of blue light radiation on curcumin-induced cell death of breast cancer cells

In the present study, we have successfully set up a novel blue light source with the power density of 9 mW/cm² and the wavelength of 435.8 nm and then the novel light source was used to investigate the effect of light radiation on curcumin-induced cell death. The cytotoxicity was investigated 24 h after the treatment of curcumin and blue light radiation together using MTT reduction assay. Nuclear chromatin was observed using a fluorescent microscopy with Hoechst33258 staining. The results showed blue light radiation could significantly enhance the cytotoxicity of curcumin on the MCF-7 cells and apoptosis induction. These findings demonstrated that blue light radiation could enhance curcumin-induced cell death of breast cancer cells, suggesting light radiation may be an efficient enhancer of curcumin in the management of breast cancer.     

Lipids of sulfate-reducing bacteria and sulfur-oxidizing bacteria found in the Dongsheng uranium deposit

U-bearing sandstones from the Dongsheng deposit in Ordos Basin contain abundant C15-C18 fatty acids. The fatty acids may have been derived from modern and ancient organisms including organisms from the intervals of U mineralization. A certain amount of i15:0, a15:0, a17:0 fatty acids coexist with small amounts of i17:1ω7c and 10me16:0, characteristic biomarkers of Desulfovibrio and Desulfobacter sp., respectively. This indicates the existence of sulfate-reducing bacteria (SRB) in the sandstones. The presence of sulfur-oxidizing bacteria (SOB), such as Beggiatoa and Thioploca, is indicated by significant amounts of 16:1ω7c and 18:1ω7c fatty acids. The existence of the SRB in the deposit, as inferred from the fatty acids, is consistent with results from fossilized microorganisms and isotopic compositions of ore-stage pyrite. This suggests that the environment may have been favorable for the SRB to grow since ore formation (9.8-22 Ma). The bacteria may have degraded hydrocarbons directly, or indirectly utilized hydrocarbons degraded by oxic microbes in the deposits. This process may have produced 12C-rich calcite and prominent baseline humps of unresolved complex mixtures (UCM), and 25-demethylated hopanes and tricyclic terpanes. The existence of sulfur-oxidizing bacteria and sulfate-reducing bacteria in the deposit may have resulted in bacterial sulfate reduction to sulfide, re-oxidization of the sulfide to sulfate and subsequent reduction of the sulfate to sulfide. This assertion is supported by ore-stage pyrite with δ34S values as low as-39.2‰, and the lightest sulfate (about 11‰) measured during the Phanerozoic, a difference of more than 46‰.     

中兴煤矿3211工作面调整通风系统设计方案

概述了3211综采工作面调整设计方案,阐述了施工技术要求,介绍了3211第6联巷和第7联巷施工永久密闭的安全技术措施以及3211综采工作面调整系统后的通风布置及各用风点布置情况。     

Microstructure and magnetic properties of Co(Cr)/Ti(Cr)/ZnO films prepared by laser ablation on Si substrates

High-quality Co(Cr)(50–66 nm)/Ti(Cr)(25–30 nm)/ZnO(165–225 nm) films were grown on Si substrates by the pulsed-laser deposition technique at 450–500°C. The microstructure of the films and their magnetic properties were investigated by X-ray diffraction, transmission electron microscopy and a vibrating sample magnetometer. It was found that the Co(Cr)/Ti(Cr)/ZnO thin films had a highly preferential c-axis direction normal to the surface of the substrate, and the ZnO sublayer had columnar structures in the growth direction. The interface of the multi-layer films is smooth without interface reaction. The as-produced films had in-plane easy magnetization. It indicates that the enhancements of the magnetic properties of the films are mainly ascribed to the grain structure and multi-domain state of the Co-alloy layer, which can be controlled by the ZnO sublayer.