Spatial Decomposition of a Broadband Pulse Caused by Strong Frequency Dispersion of Sound in Acoustic Metamaterial Superlattice

An acoustic metamaterial superlattice is used for the spatial and spectral deconvolution of a broadband acoustic pulse into narrowband signals with different central frequencies. The operating frequency range is located on the second transmission band of the superlattice. The decomposition of the broadband pulse was achieved by the frequency-dependent refraction angle in the superlattice. The refracted angle within the acoustic superlattice was larger at higher operating frequency and verified by numerical calculated and experimental mapped sound fields between the layers. The spatial dispersion and the spectral decomposition of a broadband pulse were studied using lateral position-dependent frequency spectra experimentally with and without the superlattice structure along the direction of the propagating acoustic wave. In the absence of the superlattice, the acoustic propagation was influenced by the usual divergence of the beam, and the frequency spectrum was unaffected. The decomposition of the broadband wave in the superlattice’s presence was measured by two-dimensional spatial mapping of the acoustic spectra along the superlattice’s in-plane direction to characterize the propagation of the beam through the crystal. About 80% of the frequency range of the second transmission band showed exceptional performance on decomposition.     

Effect of several m-cholinoblockaders on the functioning of sodium potential-dependent channels of neuroblastoma cells

Effects of two central antimuscarinic drugs, namely N-methyl-4-piperidinol benzylate and tropine phenylcyclopentylglycolate on Na currents in internally dialyzed mouse neuroblastoma cells were studied using the suction-pipette voltage-clamp technique. Like amine local anesthetics, the both compounds produce two phenomenologically different types of sodium current inhibition: a steady block without conditioning and a cumulative (use-dependent) block which develops during repetitive membrane pulsing. The ability of these m-cholinoblockers to modulate voltage-dependent ionic permeability of the neuronal membranes is supposed to be one of possible components in the mechanism of their both main and accessory (non-synaptic) effects.     

Study of photodynamic treatment for P-388 lympho-leukemia in mice

Data are presented on the results of photodynamic treatment (PDT) of mice DBA2 with transplantable lympho-leukemia P-388. Different regimens of photosensitizer Dimegin and emission were used. Both intravenous PDT and in combination with local PDT should be recommended.     

Viral infection markers in foci of chronic hepatitis B

The intensity of detection and time course of the main markers of virus infection were studied in subjects who had contacts with patients in 74 foci with chronic active hepatitis, 52 with chronic persisting hepatitis and 41 with chronic hepatitis of unknown etiology. A high (up to 80.7%) frequency of detection of HBsAg, anti-HBs, anti-HBc was established in contact subjects which showed a trend of growth with the increase of the time of their contact with the source of infection.