[Microanalysis study of Co-doped ZnO DMS crystal by SEM and XREDS].

In the present paper,with CoCl2 x 6H2O used as precursor, Co-doped ZnO diluted magnetic semiconductor (DMS) crystals were synthesized by hydrothermal method with KOH as mineralizer. The morphology, and the relative content and distribution uniformity of the surface and inner Co element of synthesized crystals were investigated by scanning electron microscope (SEM) and X-ray energy dispersive spectrometry (XREDS), respectively. It was found that Co-doped ZnO crystals with different morphology were yielded, while the bigger crystals showed polar growth charactertistics, and the Co content in the crystal depended on its morphology.

[X-ray microanalysis of the activity of immobilized glucose oxidase on enzyme electrode].

The localization of activity of glucose oxidase (GOD) on the pussian blue modified electrode by SiO2 sol-gel was studied by X-ray microanalysis. Glucose and Ce(NO3)3 served as substrate and capture respectively. Substrate was catalysed by immobilized GOD toproduce H2O2, and the H2O2 was captured by Ce(NO3)3 to form precipitate.

[X-ray microanalysis of the activity of immobilized urease on chitosan membrane].

The localization of the activity of immobilized urease on chitosan membrane was studied by X-ray microanalysis. BaCl2 and urea were selected as the capture and substrate respectively. The substrate was hydrolyzed by immobilized urease to produce NH3 and CO2 in Tris-HCl buffer (pH 7.

[X-ray microanalysis of the activity of immobilized L-asparaginase].

The localization of activity of immobilzed L-asparaginase by covalent binding was studied by X-ray microanalysis. Asparagine and MgCl2 served as substrate and capture agent respectively. Substrate was catalysed by immobilized L-asparaginase to produce NH3, and NH3 was captured by MgCl2 to form precipitate MgNH4PO4.

[Spectrophotometry determination of trace selenium(IV) in Chinese herbal medicine by catalytic kinetics. I. RDB and potassium bromate].

Trace Se(IV) can catalyze the discolouring oxidizing reaction of RDB with potassium bromate in nitric acid medium, and the conditions of kinetics has been studied in detail. A new method of kinetics spectrophotometry for determination of trace (IV) is established. The sensitivity of the method is 0.

[X-ray microanalysis of the activity of immobilized papain].

The localization of activity of immobilzed papain by covalent-binding was studied by X-ray microanalysis. N alpha-benzoyl-L-arginineamide hydrochloride and FeCl3 served as substrate and capturer respectively. Substrate was catalysed by immobilized papain to produce L-arginine and NH3.

[Preparation of nanocrystal Gd2O3: Eu by EDTA complexing sol-gel process and spectroscopic study].

Gd2O3: Eu nanocrystal was synthesized by EDTA complexing sol-gel process at relatively low temperature, in which ethylene-diamine-tetraacetic acid (EDTA) and polyethylene glycol (PEG) were used as the chelating agent and disperser respectively. The properties of the nanocrystal were investigated by XRD, SEM, EDS, and fluorescence spectrophotometer. The results show that nanosized, homogenous and pure cubic phase Gd2O3: Eu has been produced after the precursor calcined at 800 degrees C for 2 h.