The Effect of Mobile Phone Radiation on in vitro Platelet Aggregation in Patients with Polycythemia Vera and Ischemic Stroke

Biophysics - Abstract—The influence of exposure to mobile phone radiation on in vitro platelet aggregation has been studied. It has been shown that a 30-min exposure of blood samples to...     

The Kupershtokh-Medvedev electrostrictive instability as possible mechanism of initiation of phase transitions, domains and pores in lipid membranes and influence of microwave irradiation on cell

One of the possible mechanisms of initiation of local phase transitions and formation of nonuniform structure of biological and model lipid membranes is suggested. It is based on anisotropic electrohydrodynamic instability of Kupershtokh and Medvedev in strong electric field relative to density perturbations. This mechanism may clarify initial stages of formation of membrane domains and pores, some aspects of cell signalization and influence of microwave irradiation of nonthermal intensity on living organisms.     

The Kupershtokh-Medvedev electrostrictive instability as possible mechanism of initiation of phase transitions,domains and pores in lipid membranes and influence of microwave irradiation on cell

One of the possible mechanisms of initiation of local phase transitions and formation of nonuniform structure of biological and model lipid membranes is suggested. It is based on anisotropic electrohydrodynamic instability of Kupershtokh and Medvedev in strong electric field relative to density perturbations. This mechanism may clarify initial stages of formation of membrane domains and pores, some aspects of cell signalization and influence of microwave irradiation of nonthermal intensity on living organisms.     

Propagating Subterahertz Longitudinal Phonon-like Modes in a Lipid Bilayer in Aqueous Medium

It has been revealed recently that the subterahertz/terahertz vibrational motions in enzymes and DNA immersed in aqueous solutions can be underdamped. Importantly, these motions are associated with coherent delocalized modes that control functional processes. Analogous propagating phonon-like modes have been found in free hydrated lipid bilayers. In the present work, subterahertz (frequencies of the order of tens and hundreds of gigahertz) longitudinal acoustic oscillations in a bilayer lipid membrane immersed in aqueous medium are investigated theoretically. We consider driven oscillations excited by tangential mechanical tensions at the bilayer surfaces and thermally induced phonon modes. The analysis is based on: (i) a generalized hydrodynamic model of two-dimensional lipid bilayer in aqueous medium; (ii) known estimates of frequencies and lifetimes of longitudinal acoustic phonons in free hydrated lipid bilayer and in water, which were obtained in the experiments on non-elastic X-ray scattering and the molecular dynamics simulations. We show that the membrane phonon-like excitations are underdamped for the typical values of the system parameters, and the contribution of aqueous medium to the membrane mode damping is small compared to the contribution of the lipid bilayer. The obtained results suggest the possibility of realization of thermally induced longitudinal membrane phonons in physiological conditions, as well as the possibility of resonance amplification of the impact of subnanosecond electric impulses and impulses of subterahertz electromagnetic radiation on membrane dynamics.