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Publicatii proprii
Evaluation of the nitro/chlorine interaction parameters in nitroalkane + 1-chloroalkane and + alpha,omega-dichloroalkane systems using Disquac group contribution model
Excess Gibbs energies, GE, for ten binary systems containing nitromethane or nitroethane + 1-chlorobutane, + 1-chloropentane, + 1,2-dichloroethane, +1,3-dichloropropane, and + 1,4-dichlorobutane are interpreted in terms of the DISQUAC group contribution model. The systems are characterized by three types of contact surface: nitro (NO2), chloro (Cl) and alkane. The interchange energy parameters of the alkane/NO2 and alkane/Cl contacts were determined
Read morePhotoprotective effects of Romanian propolis on skin of mice exposed to UVB irradiation
We aimed at investigating the antioxidant, antiinflamatory, antiapoptotic and antigenotoxic effects of a Romanian Propolis (RP) extract in two concentrations (RP1 3 mg, respectively RP2 1.5mg polyphenols/cm2), topically administered, either prior to or after UVB exposure, in a Swiss mouse model. Our results showed that both concentrations of RP extract, independent of the time of administration, significantly attenuated the malondialdehyde (MDA)
Read moreGamma radiation effects on seed germination, growth and pigment content, and ESR study of induced free radicals in maize (Zea mays)
The effects of gamma radiation are investigated by studying plant germination, growth and development, and biochemical characteristics of maize. Maize dry seeds are exposed to a gamma source at doses ranging from 0.1 to 1 kGy. Our results show that the germination potential, expressed through the final germination percentage and the germination index, as well as the physiological parameters of maize seedlings (root and shoot lengths) decreased by
Read morePolyphenolic composition, antioxidant and antibacterial activities for two Romanian subspecies of Achillea distans Waldst. et Kit. ex Willd.
The aim of this work was to study the chemical composition, antioxidant and antibacterial properties of Achillea distans Waldst. et Kit. subsp. distans and Achillea distans Waldst. et Kit. subsp. alpina Rochel, from the Rodna Mountains (Romania). The identification and quantification of major phenolic compounds was performed by a HPLC-MS method. The total polyphenolic and flavonoid content was determined spectrophotometrically. The antioxidant activity
Read moreAn assay for pro-oxidant reactivity based on phenoxyl radicals generated by laccase
A transient species may be detected with UV-vis and EPR spectroscopy during turnover of a laccase with quercetin; this species is assigned as a quercetin-derived radical, based on EPR spectra as well the observed UV-vis similarities (a 540. nm centred band) with previously reported data. The rates of formation and decay of this species correlate well (. r=. 0.9946) with the pro-oxidant reactivity manifested by flavonoids in the presence of laccase.
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