Photocatalytic TiO2 films prepared by chemical vapor deposition at atmosphere pressure

Nanometer semiconductor titanium dioxide thin films have excellent properties of photocatalysitic degeneration. The glass coated TiO₂ films is called self-cleaning glass. In this paper, chemical vapor deposition (CVD) method is employed to deposit TiO₂ films on glass. The effect of spacing between nozzle and glass and the effect of substrate temperature on deposition rate are studied. The crystalline structure at different deposition temperatures is analyzed by XRD and anatase was found. And the microstructure of the TiO₂ films is also determined by SEM. It shows that the size of crystal grain increases with the temperature.     

不同电离度下大气等离子体粒子行为的数值模拟

利用一个空间零维大气等离子体模型对其中的主要粒子在不同电离度情况下的变化规律进行了研究.得到放电后不同初始电子密度下的电子寿命,同时给出了主要带电粒子和中性粒子密度随时间的演化.结果表明,电子密度随时间快速衰减,电子寿命随电离度的增大而减小.对一些重要的中性粒子(如O,N,O₃和NO)随电离度增大的行为进行了分析. 关键词： 电离度 大气等离子体 数值模拟     

NEW ESTIMATES FOR SINGULAR VALUES OF A MATRIX

New estimates are provided for singular values of a matrix in this paper. These results generalize and improve corresponding estimates for singular values in [4]-[6].     

弱酸性介质中合成B-ZSM-5型分子筛

在弱酸性介质中,用四丙基溴化铵、氟化铵合成了B-ZSM-5型分子筛。由于晶化过程中无碱金属氢氧化物等强碱参与,B-ZSM-5型分子筛原粉为铵型,灼烧除掉NH₃及有机模板剂后,直接转化为氢型,吸附吡啶后IR谱中有B酸和L酸中心存在。扫描电镜分析表明,B-ZSM-5分子筛晶体生长完美,晶体形貌随硼含量不同呈规律性变化。X射线衍射、红外光谱、X射线光电子能谱、差热分析等结果表明,硼原子位于ZSM-5分子筛骨架中。     

核酸与蛋白质相互作用研究的新技术与新方法

蛋白质和核酸是组成生命的主要生物大分子,两者的相互作用构成了诸如生长、繁殖、运动、遗传和代谢等生命现象的基础.因此,研究它们间的相互作用是人们解开生命奥秘的关键所在,在学术及应用上都具有极其重要的意义.探讨蛋白质和核酸相互作用涉及到众多学科的技术与方法,是多学科的前沿交叉领域.总体上该方面工作尚处于起步阶段,深入研究有待于研究手段的进步与创新.本文从研究手段与分析方法上对近年来该领域所采用的技术及其最新进展进行了评述.     

C60Pd(Ph2PCH2PPh2)配合物的合成及光电性能研究

Fulerene complexe C60 Pd（ Ph2PCH2PPh2）was perpared by the method of ligand substitution via the reaction of C60 with Pd（Ph2PCH2PPh2）2 under condition of a nitrogen atmosphere and refluxing,and the title compound was appraised and characterized by methods of elemental analysis,FT-IR,UV-vis,XPS and XRD. The results showed that the structure of purposeful product was that the Ph2PCH2PPh2 took up two coordination sites of the central metal,and C60 took up another two sites in σ-π feeback pattern. The porperties on photoelectricity,redox and thermostability of the title complexe were studied. The results of studying on photoelectricity showed that the photovoltaic effect of（n+n）heterojunction electrode formed by C60Pd（Ph2PCH2PPh2）/ GaAs was supper,especially in the BQ/ H2Q redox couple,and the greatest value of photovoltaic potential was up to 174 mV. The photovoltaic performance of C60Pd（Ph2PCH2PPh2）/GaAs electrode at 1 μm for thickness of C60Pd（Ph2PCH2PPh2）film was the best.     

Controlling the pyridinium–zwitterionic ligand ratio on atomically precise gold nanoclusters allowing for eradicating Gram-positive drug-resistant bacteria and retaining biocompatibility

Infections caused by multidrug-resistant (MDR) bacteria are an increasing global healthcare concern. In this study, we developed a dual-ligand-functionalised Au₂₅(SR₁)_x(SR₂)_18−x-type gold nanocluster and determined its antibacterial activity against MDR bacterial strains. The pyridinium ligand (SR₁) provided bactericidal potency and the zwitterionic ligand (SR₂) enhanced the stability and biocompatibility. By optimising the ligand ratio, our gold nanocluster could effectively kill MDR Gram-positive bacteria via multiple antibacterial actions, including inducing bacterial aggregation, disrupting bacterial membrane integrity and potential, and generating reactive oxygen species. Moreover, combining the optimised gold nanocluster with common antibiotics could significantly enhance the antibacterial activity against MDR bacteria both in in vitro and animal models of skin infections. Furthermore, the fluorescence of the gold nanocluster at the second near-infrared (NIR-II) biological window allowed for the monitoring of its biodistribution and body clearance, which confirmed that the gold nanoclusters had good renal clearance and biocompatibility. This study provides a new strategy to combat the MDR challenge using multifunctional gold nanomaterials.

A NIR-II fluorescent Au₂₅ nanocluster capped with optimal dual functional ligands can effectively aggregate and kill Gram-positive drug-resistant bacteria while maintaining good biocompatibility.     

M—矩阵的等价表征

本文引进了按环路弱不约非零元素对角占优的概念，讨论了Ｍ－矩阵的等价条件，给出了Ｍ－矩阵的两个等价表征，改进与推广了（１），（２），（５），（９）的相应结果。     

Molecularly imprinted polymers outperform lectin counterparts and enable more precise cancer diagnosis

Accurately analysing the particular glycosylation status of protein biomarkers is of significant importance in the precise, early diagnosis of cancer. Existing methods mainly rely on the use of antibodies and lectins. However, due to the macroscopic and microscopic heterogeneity of glycans, precise analysis of glycosylation status still remains a challenge. Molecularly imprinted polymers (MIPs), as a synthetic alternative to antibodies or lectins, may provide new solutions but have not yet been explored. Herein, we report an appealing strategy called triple MIP-based plasmonic immunosandwich assay (triMIP-PISA) for precise cancer diagnosis in terms of the relative glycosylation expression of glycoprotein biomarkers. As proof of the principle, alpha fetoprotein (AFP), which has been used as a clinical biomarker for early detection of hepatocellular carcinoma (HCC), as well as its Lens culinaris agglutinin (LCA)-reactive fraction (AFP-L3), which is mainly composed of core-fucosylated glycans, were used as two target proteoforms to test in this study. Using two MIPs that can specifically recognize the peptide sequence of AFP as well as a fucose-imprinted MIP that can specifically recognize the AFP-L3 fraction, facile simultaneous plasmon-enhanced Raman detection of AFP and AFP-L3 in serum was achieved, which allowed HCC patients to be distinguished from healthy individuals. Due to the excellent recognition properties of the MIPs that are comparable to those of antibodies and superior to those of lectins, our triMIP-PISA method exhibited improved precision as compared with an antibody plus lectin-based immunofluorescence assay. Thus, this strategy opened a new avenue towards the precise diagnosis of cancer.

A triple molecularly imprinted polymer (MIP)-based plasmonic assay was developed for precise cancer diagnosis in terms of the relative glycosylation expression of glycoprotein biomarkers.     

亚纯函数的正规族与正规函数

本文讨论了正规族和正规函数之间的联系.设为单位圆盘上的一族亚纯函数.若对每一f∈ Ef(ai)=Ef′(ai),i=1,2,3 在是成立,则存在正数M=M(a1,a2,a3),使得对每一f∈,有 (1-|z|2)|f′(z)|1+|f(z)|2M, 其中a1,a2和a3是有限复数,M仅与a1,a2和a3有关.