Since one of the most valuable measurable parameters in laser, called effective cavity lifetime , gives useful information about laser, this paper aims to study the description of it dependency, , on geometrical characteristics of N2-laser, electrodes length and amplifier gap separation. First based on the studies carried out on it , an oscillator-amplifier laser is used which operates under mo...

Arctigenin was successfully isolated and purified from the crude extract of Saussurea medusa Maxim. by automatic flash preparation chromatography (AFPC). Chromatographic separation was performed with a gradient elution of (A) petroleum ether and (B) acetone. The qualitative analysis was accomplished with thin layer chromatography (TLC) under the following conditions: petroleum etheracetone (5:3...

The study investigated the photoluminescent properties of undoped and rare-earth element erbium - doped solid solutions GaS1-xSex0.1аt% irradiated with gamma-quanta. Erbium doping reduces photoluminescence intensity in solutions. After irradiation Dg= 300-1000Gy, increases. An increase is explained by a decrease concentration centers responsible for fast recombination channel associated lattice...

background: mentha piperita l. essential oils have different antibacterial activity. in the present study, we investigated the effect of γ–irradiation on the antibacterial activities of mentha piperita l. essential oils in vitro and in vivo systems. materials and methods: the aerial parts of peppermint were irradiated in a cobalt60 source with 0, 10 and 25 kgy absorbed doses. then, the plants w...