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1.
Biofizika ; 57(4): 621-6, 2012.
Artigo em Russo | MEDLINE | ID: mdl-23035527

RESUMO

Theoretical model of transmission in cytoplasm of self consistent electric-and magnetic waves of millimeter-infrared range have been developed; cytoplasm ions surrounded by water molecule "fur-coats" being the main carriers of these waves. It has been discovered that not only own long-wave transverse waves, but also linear waves which are not able to leave cytoplasm can exist in tissues of living organisms. Frequencies and logarithmic decrements of such perturbation have been found, and it has been shown that these frequencies approach the ion fluctuation frequencies inside the "fur-coats". Laser radiation movement in bioobjects on the indicated frequencies has been analyzed, and it was detected the existence of no penetrative stripes of waves into bodies. The new mechanism of swinging of cytoplasm own fluctuation based on the existence of the extreme border of the ion movement area has been proposed. It has been shown that having this mechanism the electric field magnitude of linear waves is six-seven degrees larger than Plank fluctuation level.


Assuntos
Citoplasma/química , Radiação Eletromagnética , Íons/química , Modelos Teóricos , Cinética , Lasers , Água/química
2.
Biofizika ; 57(4): 627-30, 2012.
Artigo em Russo | MEDLINE | ID: mdl-23035528

RESUMO

The distribution of an electric field in plant cells and zooblasts has been investigated at propagation of the action potential. The behavior of ions in the cytoplasm and in the extracellular fluid has been described with the equations of electric charge motion in the electrolytes. It has been shown that the action potential causes an electric potential change not only in the depth of the cytoplasm but also in the extracellular area far from the lipidic bilayer. The biomembrane resistance has been expressed by physical parameters of a cell, such as ionic diffusion coefficient in fluid, Debye-Huckel radius, dielectric conductivity etc. The presence of breakings in the action potential diagrams has been explained as a result of insufficient resolving power of the measuring devices at the instant the sodium ionic canals of the bilayer opens.


Assuntos
Potenciais de Ação , Modelos Teóricos , Células Vegetais , Fenômenos Biofísicos , Membrana Celular , Difusão , Bicamadas Lipídicas
3.
Biofizika ; 42(2): 417-23, 1997.
Artigo em Russo | MEDLINE | ID: mdl-9172687

RESUMO

The dielectric permeability of the different layers of biological membrane were investigated. The objects taken into account included a lipid bilayer, membrane proteins and external covers formed by clumps of protein chains. The distribution of electric fields and the values of electrostatic forces of membrane elastic layers stretching was found in such membrane.


Assuntos
Membrana Celular/fisiologia , Elasticidade , Membrana Celular/química , Bicamadas Lipídicas/química , Proteínas de Membrana/química , Eletricidade Estática
4.
Biofizika ; 40(6): 1243-50, 1995.
Artigo em Russo | MEDLINE | ID: mdl-8590717

RESUMO

A method for calculating the transmembrane electric fields in surface and integral proteins of plasma membrane is suggested. It is shown that the function of distribution of electrostatic potential along the length of the membrane channel in protein differs essentially from the linear function. A nonuniform distribution of the electric field in the hydrophobic moiety of the lipid bilayer around the protein was found and the electrostatic interaction of proteins in a bilayer was analyzed. The effect of electric polarization on proteins and lipids was estimated. The mechanisms of formation of "lipid rings" around the proteins was explained. The shape and size of the membrane protein are predicted that is able to perform unilateral transfer across the membrane of neutral molecules possessing the dipole moment.


Assuntos
Proteínas de Membrana/química , Eletricidade , Bicamadas Lipídicas/química , Modelos Químicos
5.
Biofizika ; 40(6): 1251-5, 1995.
Artigo em Russo | MEDLINE | ID: mdl-8590718

RESUMO

The interaction of ions of electrolyte cytoplasm with the electric fields of image charges in adjacent dielectrics (membranes, proteins) was computed. The screening effect of neighbouring ions on the electric field of each image charge was taken into account. It is shown that the forces produced by these image charges are significant only at distances from dielectric surfaces that do not exceed three-four average distances between the charges in the cytoplasm. The forces and energies were computed with which liquid ions push away the surfaces of two adjacent membranes or proteins. It is shown that these values exceed hundreds times normal ionic-electrostatic interactions. The proposed approach taken it possible to explain the experimentally observed behaviour of on cell adhesion, the collective mode of protein interaction in plasma membranes and other phenomena.


Assuntos
Proteínas de Membrana/química , Membrana Celular/química , Eletricidade , Íons
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