urinary 1-hydroxypyrene is frequently used as a major metabolite and biological indicator of the overall exposure to polycyclic aromatic hydrocarbons. in this study, solid phase extraction was appropriately conditioned with regard to sample ph, sample concentration, loading flow rate, elution solvent, washing solvent, sample volume and sorbent mass. octadecyl silica cartridge (c18) was used as ...

copolymerization of aniline and 2-anilinoethanol was carried out by electrochemical and chemical polymerization. homo and copolymer thin films were synthesized electrochemically, under cyclic voltammetric conditions in aqueous solutions of sulfuric acid as electrolyte at room temperature. the films were deposited on the surface of working electrode [glassy carbon ()gc)(] versus ag/agcl electrod...

background: copper-64 (t1/2=12.7 h) is an important radionuclide used both in pet imaging and therapy. [64cu]-pyruvaldehyde-bis (n4-methylthiosemicarbazone) ([64cu]-ptsm) is one of the most famous copper radiopharmaceuticals with unique specifications (suitable half life, stability, etc.). the wide range of 64cu applications arouse great interest for its production. materials and methods: cu-64...

a new kinetic spectrophotometic method for the determination of trace amount chromium (iii) in teareal samples has been described based on it s the catalytic effect on the oxidations of 1 - ( 2 –pyridylazo ) - 2 - naphthol, (pan), by potassium bromated in sulfuric acid. the reaction is followedspec- trophotometrically by measuring the decrease in the absorbance at 469 nm. under the optimumcondi...

background and aims. the aim of this study was to evaluate the possible effects of obesity on the local (salivary) and systemic tnf-α and il-6 levels in patients with chronic periodontitis (cp). materials and methods. this study included 88 subjects assigned to four groups of 22 subjects each, as follows: group o+p+ (patients with obesity and cp), group o-p+ (patients with normal weight and cp)...

In the title hydrated mixed-cation salt, (C(5)H(8)N(3))(2)[Co(H(2)O)(6)](SO(4))(2)·2H(2)O, the complete octa-hedral hexa-aqua complex cation is generated by crystallographic inversion symmetry. In the crystal, the components are linked by O-H⋯O and N-H⋯O hydrogen bonds, the latter, involving pyrimidinium cations and sulfate anions, generating R(2) (2)(8) loops. These, together with π-π inter-ac...