Study of the interaction between daunorubicin and human serum albumin,and the determination of daunorubicin in blood serum samples

The interactions between daunorubicin and human serum albumin (HSA) were studied using the spectrofluorimetric method. The binding constants of daunorubicin with HSA were obtained at different temperatures. The effects of various metal ions on the binding constants of daunorubicin with HSA were also studied. The optimum conditions of fluorometric determination of daunorubicin were studied and the developed method was successfully applied to the determination of daunorubicin in serum samples.     

用离子交换/ICP-AES联用技术研究溶液中配合铝的形态及分布

以阳离子交换微柱分离与ICP-AES检测联用技术为分离/检测手段,系统地研究了不同配体配合物体系中铝的形态及其分布.当pH=6.0时,溶液中非稳定态单核铝被微柱所保留,而稳定态配合铝直接从微柱中流出.所选择的研究体系分别为:Al-氟化物(Al-Fluoride),Al-磷酸盐(Al-Phosphate),Al-柠檬酸盐(Al-Citrate),Al-草酸盐(Al-Oxalate)及Al-EDTA.在确定的pH值条件下,研究了不同的摩尔比[n(Al)/n(配合剂)]对铝的形态分布的影响,得到了一些对实际应用有指导意义的规律性结论.     

Complete assignment of (1)H and (13)C NMR data of dihydroxyflavone derivatives

Six flavone derivatives were studied. Previously reported NMR data of three of these derivatives were corrected and the NMR data for the other three derivatives not studied previously were completely assigned on the basis of the basic 1D and 2D NMR experiments and molecular modeling.     

Korngrößenänderung beim Carburieren von Wolfram und Sintern von Wolframcarbid

The change of grain size during each stage of the process was studied, mainly by optical and electron microscopy. The grain size has a marked effect on the properties of cemented carbide. In order to determine the process of formation of WC powder, the cross section and the surface of the carburized powder were examined microscopically. The mechanisms of carburization and grain growth were clarified. The microstructural relationship between the WC powder and the cemented carbide was also determined. The Co from the ball milled WC-Co mixed powder was extracted and the remaining WC powder was studied microscopically and by determining the grain size distribution. Methods of particle crushing and their effect on differences between various forms of WC powder were studied. Grain growth in sintering and the effect of grain size distribution were also studied. It was concluded that grain growth begins long before the appearance of the liquid phase. Finally it was pointed out that the inner structure of WC should be studied at the atomic level.     

Reaction of dibromoalkanes with silyl phosphites. Synthesis and properties of mono-and diphosphonoalkanes

Reactions of dibromoethane and dibromopropane with silyl phosphites are studied. Mono-and diphosphonoalkanes of various structures were prepared, and their chemical properties were studied.     

Synthesis of ultrafine refractory oxides zirconia-hafnia-yttria by sol-gel technology

A transparent gel was prepared using a hydrolytically active solution of zirconium, hafnium, and yttrium alkoxoacetylacetonates. This gel served to synthesize ultrafine zirconia-hafnia-yttria complex oxide. The product dispersity was studied as affected by the parameters of xerogel heat treatment. The thermal behavior of the xerogel was studied by DSC-TGA. Elemental analysis (laser mass spectrometry) and phase analysis of the synthesized materials were carried out. Average crystallite sizes were calculated by the Scherrer relationship. The particle morphology was studied by TEM. Specific surface areas were determined. Sintering of ultrafine oxide powders was studied at 1000, 1200, and 1400°C.     

四(对-硝基)苯基卟啉合钴、锰、铁、锌配合物电化学和光谱电化学性质的研究

应用循环伏安法、现场紫外可见光谱电化学方法及现场ＦＴ—ＩＲ光谱电化学方法研究了标题配合物不同氧化态的电位及光谱特征,指认了各步电极反应发生的点位,研究了硝基对不同氧化态金属卟啉电学性质、光谱性质的影响     

Sorption properties of chemically treated clinoptilolites with respect to Cs and Co

The sorption ability of clinoptilolite treated by NaOH solution has been studied. The distribution coefficients of¹³⁷Cs and⁶⁰Co were studied by the radiochemical method. The variation of distribution coefficients with pH was studied. Also the influence of competitive ions on distribution coefficients were investigated. The total cation exchange capacity and XRD analysis were also measured.     

Formation of Physical Thermally Reversible Gels in Solutions of Methyl Cellulose in Water and Dimethylacetamide and Properties of Films Thereof

Gelation conditions in solutions of methyl cellulose in water and dimethylacetamide were studied. The gelation mechanisms were studied by X-ray diffraction and photocolorimetry, and their differences in the two systems were revealed. The physicomechanical properties of methyl cellulose films prepared from solutions with preliminary gelation were determined.     

Study of physical and thermochemical properties of modified zeolites

The treatment of zeolite with a solution of NaOH at different concentrations creates modified forms of natural zeolites.These modified zeolites exhibit an increased uptake of caesium and a satisfactory uptake of cobalt. The structural changes in the modified zeolites were studied by XRD analysis, which reveals the mineral compositions of the studied materials. The thermodynamic properties of the modified zeolites were studied by means of DTA and thermogravimetry, and the chemical composition too was determined.     

烷基钴卟啉[(TPP)CoR]的电化学合成和现场伏安/现场光谱电化学研究

本文报道甲基、乙基、丙基和丁基钴卟啉化合物的电化学合成和现场伏安、现场光谱电化学研究,烷基化反应的速度被确定.这些烷钴卟啉还原反应生成烷基饱和的四苯基chlorin钴化合物.     

A Study of Crystallization in the System TiO2(Al2O3)-H2SO4-(NH4)2SO4-H2O in Obtaining Titanium-Aluminum Tanning Agent

The conditions under which a titanium-aluminum tanning agent is obtained from sulfuric acid solutions were studied. The composition was established and the properties were studied of the forming phases.     

Radionuclide analysis using solid phase extraction disks

The use of solid phase extraction (SPE) disks was studied for the quantification of selected radionuclides in aqueous solutions. The extraction of four radionuclides using six types (two commerical, four test materials) of 3M Empore^TM RAD disks was studied. The radionuclides studied were: technetium-99 (two types of disks), cesium-137 (two types), strontium-90 (one type), plutonium-238 (one type). Extractions were tested from DI water, river water and seawater. Extraction efficiency, kinetics (flow rate past the disk), capacity, and potential interferences were studied as well as quantification methods.     

Foaming in aqueous solutions of hexadecyltrimethylammonium bromide and silica nanoparticles: Measurement and analysis of rheological and interfacial properties

The properties of aqueous foams stabilized by a mixture of negatively charged silica nanoparticles and hexadecyltrimethylammonium bromide were studied in this work. Rheological properties of the foams were studied. The interaction between nanoparticles and surfactant molecules in the bulk phase was studied by zeta potential and size measurements of the particles. The interaction at the interface was studied by means of interfacial shear rheology, surface pressure measurement, and atomic force microscopy. It was found that foams were more stable at low surfactant concentrations, though the foamability was low. This was due to the formation of a strong viscoelastic film of surfactant-laden particles at the air–water interface. A suitable mechanism has been proposed to explain the stability of foams in the presence of nanoparticles at different surfactant concentrations.     

具有生物活性有机硅化合物的研究(Ⅻ)─N－烃基－N－三甲硅基－5－叔丁基－2－呋喃甲酰胺类化合物的合成与生物活性的研究

具有生物活性有机硅化合物的研究（Ⅻ）──Ｎ－烃基－Ｎ－三甲硅基－５－叔丁基－２－呋喃甲酰胺类化合物的合成与生物活性的研究廖仁安,谢庆兰,吴益民（南开大学元素有机化学国家重点实验室,元素有机化学研究所,天津,３０００７１）关键词　有机硅化合物,呋喃甲酰...     

Effect of ZnO nanoparticles on the thermal and mechanical properties of epoxy-based nanocomposite

Effect of ZnO nanoparticles particles on the mechanical properties and the curing behavior of an epoxy nanocomposite were studied. Nanocomposites were prepared using different loadings of pre-dispersed ZnO nanoparticles having an average size of 40 nm. The surface topography and morphology of the nanocomposites were studied using atomic force microscope (AFM). The mechanical properties of nanocomposites were studied using analytical techniques including dynamic mechanical thermal analysis and micro-Vickers hardness. Effects of ZnO nanoparticles on the curing behavior of these nanocomposites were investigated utilizing isothermal and non-isothermal differential scanning calorimeter techniques. In addition, chemical compositions of coatings containing different ZnO nanoparticles contents were studied using a Fourier transform inferred. It was found that, ZnO nanoparticles can effectively influence the mechanical properties of epoxy coating. In addition, lower curing degrees, and therefore crosslinking density of epoxy coating including higher ZnO nanoparticles were obtained. This effect was completely different at low and high loadings of the particles.     

一些烷氧基亚甲基二苯胂基二茂铁衍生物的质谱分析

对６个新的烷氧基亚甲基二苯胂基二茂铁衍生物进行质谱分析研究，在它们的电子轰击电离质谱中显现了强的分子离子峰和表征主体结构的一系列特征峰。通过磁场／静电场联动扫描和精确质量的测定探索了这类化合物的质谱裂解规律。     

聚苯胺的化学合成及表征

本工作利用化学方法合成了具有较高电导率的聚苯胺.研究了聚合条件如反应介质的pH值,不同种类的酸及其浓度,氧化剂的用量对聚合的影响.用红外光谱、X-射线衍射、DSC等方法表征了所得的聚合物,并研究了该聚合物的掺杂反应.     

Mathematics for chromatography. Part I: Concentration distributions and their moments

Several distributions of interest in chromatography were studied. In each case, the moments up to 4th moment were evaluated and the skew and the excess were deduced. The distributions studied in this article are the normal, continuous Poisson, discrete Poisson, exponentially modified normal, and exponentially modified Poisson distributions.     

Internal energy distribution in electrospray ionization

Internal energies and energy distributions were studied using the 'survival yield' method developed previously. In addition to conventional benzylpyridinium salts, protonated esters (fragmenting by rearrangement) and protonated leucine enkephalin were also used, extending the validity of the technique. Fragmentation processes were studied in the cone voltage region and modeled by the RRKM-based MassKinetics program. The results show that the shapes of the energy distributions are similar to thermal distributions. The mean internal energies are very similar for all compound classes studied, and show a linear increase with collision energy in the 10-50 eV region.