Determination of bioelectrochemical parameters of red cell using a piezoelectric crystal sensor

Based on the impedance behavior of red cell at high frequency, the frequency response of series piezoelectric crystal sensor in the red cell suspension was derived and verified experimentally. A method of using piezoelectric crystal sensor to determine the conductivity of the interior of the cell was proposed. The experimental results show that the mean conductivity of rabbit red cell cytoplasm was 0.269 S/m and the mean shape factor of red cell was 2.05.     

SOLVABILITY OF A THREE-POINT BOUNDARY VALUE PROBLEM WITH NONLINEAR GROWTH

In this paper, we study the existence of solutions to a three-point boundary value problem with nonlinear growth. Sufficient conditions for the existence of solutions to the system in the resonance and non-resonance cases are established by employing Leray-Schauder continuation theorem and the coincidence degree theory.     

Fluoro‐protected carbazole main‐chain polymers as a new class of stable blue emitting polymers

The protection of the 3,6‐positions of 9‐alkyl‐9H‐carbazole repeat units with fluorine substituents in 2,7‐linked main‐chain polymers as well as in copolymers with triaryl amine repeat units affords blue emitting materials with enhanced electrolytic stability. The electronic conjugation of this new class of materials is more extended than that of the equivalent polymers where the 3,6‐positions are protected with methyl substitutions as a result of the smaller steric hindrance of their fluorine substituents. Attachment of fluorine‐protecting groups at the 3,6‐positions of carbazole repeat units in the homopolymers resulted in materials with relatively high ionization potentials (5.71 eV). However, introduction of triaryl amine comonomers as alternating repeat units provided carbazole/triaryl amine copolymers with a low ionization potential (5.25 eV), a very high quantum yield of fluorescence in solution (0.96), and narrow emission bands [full width at half maximum (FWHM) = 52 nm]. The preparation of this new class of materials together with a study of their electronic and photophysical properties is presented. Copyright © 2007 John Wiley & Sons, Ltd.     

THE N-NITROSAMINES IN TOBACCO SMOKE AND ITS ADSORPTION AND DEGRADATION

1. INTRODUCTION Tobacco smoking ranks as a major public health problem whose negative impacts have been well established since the report of “smoking and health” published by the royal medicine academy of English in 1954. Besides nicotine, the major inducer of tobacco dependence, cigarette smoke also contains various toxic compounds, notably N-nitrosamines. Nitrosamines are formed by the nitrosation(addition of an N=O group, from the nitroso ramifications NO2, N2O3,N2O4) of secondary…     

A Novel Biomolecular Immobilization Matrix Based on Nanoporous ZnO／Chitosan Composite Film for Amperometric Hydrogen Peroxide Biosensor

The performance of an enzyme electrode often depends on the method of enzyme immobilization when fabricating biosensors1. Therefore, the technique used to immobilize the enzyme is one of the key factors in developing a reliable biosensor. Organic-inorganic composite (or hybrid) materials have emerged in recent years. It combines the physicochemical attributes of components and improves their features. Organic components benefit the formation of defect-free inorganic membranes and make it less …     

Structural Characterization of a Polyaluminosilazane Precursor Prepared by Polymerizing Hexamethylcyclotrisilazane with Aluminum Acetylacetonate

A new polyaluminosilazane precursor was prepared by polymerizing hexamethylcydotrisilazane (HMCTS) with aluminum acetylacetonate and the structure of the precursor was characterized by FF-IR and XPS analysis. Result shows that aluminum was incorporated mainly in form of Al--N bond. Oxygen was also detected and found that it was mainly bonded to silicon.     

常系数线性随机系统的小波特征

该文研究了线性随机系统在小波变换下的一些性质,得到一些新结果.     

Protein analysis based on molecular beacon probes and biofunctionalized nanoparticles

With the completion of the human genome-sequencing project, there has been a resulting change in the focus of studies from genomics to proteomics. By utilizing the inherent advantages of molecular beacon probes and biofunctionalized nanoparticles, a series of novel principles, methods and techniques have been exploited for bioanalytical and biomedical studies. This review mainly discusses the applications of molecular beacon probes and biofunctionalized nanoparticles-based technologies for realtime, in-situ...     

小麦粉的ICP-AES多元素同时测定

本文报告了ICP-AES法同时测量小麦粉中Ca、Mg、Al、Fe、Cu、Zn、Mn、Ba、Y、Ni的含量。采用元素间干扰系数法校正主要基体元素对微量元素测定的光谱干扰。本法应用于湖南省粮食中重金属含量调查与评价,获得了令人满意的结果。     

Ti3+ self-doped TiO2 photoelectrodes for photoelectrochemical water splitting and photoelectrocatalytic pollutant degradation

To improve the harvesting of visible light and reduce the recombination of photogenerated electrons and holes,Ti³⁺self-doped Ti O₂ nanoparticles were synthesized and assembled into photoanodes with high visible light photoelectrochemical properties.X-ray diffraction,transmission electron microscopy,X-ray photoelectron spectra,electron resonance spectroscopy and energy dispersive X-ray spectra were used to characterize the structure,crystallinity,morphology and other properties of the obtained nanoparticles.UV–visible diffuse reflectance spectra showed that the Ti³⁺self-doped Ti O₂ nanoparticles had a strong absorption between 400 and 800 nm.Moreover,when hydrothermal treatment time was prolonged to 22 h,the heterogeneous junction was formed between the anatase and rutile Ti O₂,where the anatase particles exposed highly active {001} facets.Under visible light irradiation,the Ti³⁺self-doped Ti O₂ electrode exhibited an excellent photoelectrocatalytic degradation of rhodamine B（Rh B） and water splitting performance.Intriguingly,by selecting an appropriate hydrothermal time,the high photoconversion efficiency of 1.16% was achieved.