A comparison of four selective detectors for analysis of single-digit ppb level sulfur is described. A dynamic blending system is used for point of use preparation of low level gaseous mixtures of eight sulfur compounds including H 2 S, COS, CS 2 and selected mercaptans in helium, ethylene, propylene, and carbon dioxide. The criteria to consider for selecting the best detector for an applicatio...

A simple method to pre-concentrated derivative aromatic compounds on active carbon in column has been applied as stationary phase which is used to measure the concentration of derivative aromatic compounds in water samples by means of solid-phase extraction. To measure 250 cc water samples and 250mg active carbon could be applied. Next step is to measure the derivative aromatic compounds by inj...

s. Acevska J, Stefkov G, Petkovska R, Kulevanova S, Dimitrovska A. Chemometric approach for development, optimization, and validation of different chromatographic methods for separation of opium alkaloids. Anal Bioanal Chem. 2012 May;403(4):1117-29. Institute of Applied Chemistry and Pharmaceutical Analysis, Faculty of Pharmacy, University Ss. Cyril and Methodius, Skopje, Republic of Macedonia....

BACKGROUND Evaluation of exposition to Volatile Organic Compounds (VOC) and compare urinary level of urinary biological exposure index in sweepers in West of Iran. METHODS This study was carried out on 40 street sweepers and 40 non-exposed as control group living in Hamadan City, west of Iran. VOC was analyzed using gas chromatography equipped with a Flame Ionization Detector (FID). The urina...

BACKGROUND The aims of this study were evaluation of exposed to xylenes in low concentration and compare urinary level of methyl hippuric acid in taxi drivers and petrol stations workers in West of Iran. METHODS This observation study was carried out on samples of the exposed men to xylenes in two occupational groups in Hamadan City (west of Iran) from March 2003 to March 2004. Subjects inclu...

Acrylic base resins are widely used in orthopedics and dental surgery. It is generally accepted that due to the incomplete conversion of methyl methacrylate (MMA) monomer to the polymer form during polymerization of the resin, some MMA monomers remain in the hardened material. MMA monomer has been reported to cause abnormalities or lesions in several organs of animals. Study of the literatures ...

Introduction: Nonalcoholic fatty liver disease (NAFLD) is a global disease which its prevalence is about 10-35%. Several factors are involved in the pathogenesis of the disease. The present study was conducted to evaluate the effect of fasting during Ramadan on plasma free fatty acids in patients with NAFLD.Methods: This cross-sectional study was performed during the month of Ramadan in June-Ju...