[Effect of the extremely weak alternating magnetic fields on the regeneration of planarians and the gravitropic response of plants].

The influence of extremely weak alternating magnetic fields (EW AMF) directed colinearly to the static Earth magnetic field on the rate of regeneration of planarians and the rate of gravitropic response in the stem segments of flax has been studied. The value of bioeffects of EW AMF is determined by the parameter gamma B(AC)/f, where y is the gyromagnetic ratio of the magnetic moments induced by the orbital movements of electrons in atoms, and B(AC) and f correspond to magnetic induction and frequency of the alternating magnetic component. It was shown that the magnitude of bioeffects depends on the amplitude (at fixed 1000 Hz - frequency) and frequency (at fixed 192 nT - amplitude) of the alternating component.

[Effects of weak magnetic fields on the production of reactive oxygen species in peritoneal neutrophils in mice].

The influence of weak magnetic fields of different types on the rate of the formation of reactive oxygen species in mouse peritoneal neutrophils has been studied. It was found that the exposure of neutrophils activated by phorbol 12-myristate 13-acetate to the magnetic field tuned to the parametric resonance for Ca2+ ions leads to a decrease in the rate of the reactive oxygen species (ROS) generation by 23%. Conversely, the generation of ROS in neutrophils exposed to the same field but stimulated by the bacterial peptide FMLP (N-formyl-L-methionyl-L-leucyl-L-phenylalanine) increased by about 21%.

[Monitoring the orientation of myosin bridges on two-dimensional maps of birefringence in a single muscle fiber].

Two-dimensional maps of birefringence in sarcomers of a single fiber of rabbit m.psoas were obtained by an automated interference microscope developed at our laboratory. The changes in birefringence of muscle fibers reflect the movement of myosin cross-bridges.

[Two-dimensional reconstruction of birefringence map of the skeletal muscle sarcomere in relaxed and rigor states studied by interference microscopy].

A new method of automatized quantitative interferometry of skeletal muscle fibers was developed for the investigation of birefringence. A device based on the Linnic microscope was constructed to obtain phase images, which are two-dimensional pictures of birefringence. For the first time, two-and-three-dimensional maps of both total birefringence and birefringence for individual sarcomeres in the central part of muscle fiber were visualized using large databases.

[Ca2+ localization in muscles with double calcium regulation].

Localization of Ca-accumulating structures was studied in scutal depressor muscles of barnacle (Balanus rostratus) by electron microscopy combined with osmium--pyroantimonate technique. In resting fibers the pyroantimonate precipitate was localized mainly in plasma membranes of the cleft system which can be considered as main calcium store. The precipitate was also located in membranes of sarcoplasmic reticulum and mitochondria and I--bonds diffusely.