Influence of the ionization process on characteristics of spatial relaxation of the average electron energy in inert gases in a uniform electric field.

Theoretical studies of the characteristics of the spatial relaxation of the average energy of electrons in inert gases (He, Ne, Ar, Kr, Xe) in a uniform electric field had been carried out. Conditions were considered when spatial relaxation has the character of damped oscillations. The calculations were performed using the Monte Carlo technique both without and taking into account the secondary electrons that appeared due to the ionization of atoms by electron impact.

Effect of an electric field on air filament decay at the trail of an intense femtosecond laser pulse.

Air plasma density decay in a filament produced by an intense femtosecond laser pulse in an external electric field was investigated experimentally and theoretically. It was demonstrated by means of the terahertz scattering technique that the rate of plasma decay decreases with increasing electric field. At the electric field of 7 kV/cm the lifetime of plasma with the density above 10(16) cm(-3) was prolonged from 0.

[Synaptic plasticity and the glio-synaptic relationships of the rat hippocampus in age-related memory dysfunction].

Qualitative and quantitative studies of structural changes of synaptic contacts and processes were performed in aged memory-non-impaired an aged memory-impaired rats compared to young rats in the stratum lucidum of the hippocampus. Aged memory-impaired rats (compared with young adults) showed alteration in the ultrastructure of mossy fiber expansions and the loss of axospinous synapses formed by them. These changes were more pronounced than in memory-non-impaired rats.