It is found that the sample stained with silver methenamine instead of mercaptoacetic acid-osmium can prevent the false phenomena caused by the inappropriate use of mercaptoacetic acid.

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To prevent epidemical disease prevalence caused by microorganisms in indoor air, a study was carried out to investigate the effect of ventilation, peracetic acid and ozonization on microorganisms reduction in the indoor air within a campus. The experimental results indicated that ventilation was an effective measure in reducing indoor air microorganisms with economy and simple operation.

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objective to determine the contents of residual acetone in acetoacetic ester,the raw material for the synthesis of edaravone, by gas chromatography.methods sample solution was injected on a gdx column (0.18 mm～0.25 mm) with nitrogen as the carrier gas.the residue was calculated by the external standard method.results the linearity was good over the range of 25 μg/ml～400 μg/ml,with the correlation coefficient of acetone being 0.996 and the average recovery 96.8%.conclusions the method was proved to be simple,rapid,practical and highly sensitive.it is an efficient method for the quality control of acetoacetic ester.

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The results showed that all of the four preservatives can prevent the growth of bacteroidal soft rot, and the effect of sodium diacetate was the best. After 40 or 45 days' storage, all of the untreated asparagus were rotting, but the incidence of disease of the asparagus treated with 1.5% sodium diacetate was 0 and 32% respectively. 0.5% Zhongshengjunsu, 1.5% sodium diacetate and 1% sodium chloride can delay the reduce of chlorophyll.

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With the yield of methyl monochloroacetate as evaluating standard,the synthesized condition of methyl chloroacetate was optimized through orthogonal experiment.

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The silk-protein-like polymers could be dissolved in hexafluroisopropanol and strong organic acid (e. g., formic acid, dichloroacetic acid and trifluroacetic acid), while they showed a poor solubility in common solvents.

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The synthesis of sucrose ester containing ethanoyl and oleoyl was performed by transesterification between sucrose octaacetate and ethyi oleate in organic solvents, using lipases Novo435 as the catalyst.

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Compared with other antiseptic,SDA can make food have non-harm,fresh,good taste,long stire,low price etc merits.

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The paper involved two parts: Part 1: A two-chambered microbial fuel cell was constructed with high-concentration sodium acetate as fuel in the anode. The influence of different electron acceptors in the cathode, external resistance value, pH value and concentration of sodium acetate on electricity generation in MFC was investigated. The result showed that the maximum power density of 294.72 mW/m2 and the coulombic efficiency of 25.87% was achieved at sodium acetate concentration of 6.46 g/L, pH 7.0, external resistance 500Ωin the anode and when using potassium permanganate as electron acceptor in the cathode.

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Glycidyl benzoate,glycidyl propionate,glycidyl acetate were obtained respectly through a phase-transfer catalytic methodology using sodium benzoate, sodium propionate, sodium acetate and epichlorohydrin as raw materials, and pure products were obtained though vaccum distillation.β-cyclodextrin and glycidyl benzoate, glycidyl propionate, glycidyl acetate, reacted in organic solvent and goal product were

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