[F1-ATPase as a self-excited oscillatory system].

A mathematical model for F1-type ATPase is presented, which shows that this enzyme can operate as a self-excited oscillatory system.

[Synchronization of mechanochemical auto-oscillations within the Physarum polycephalum plasmodium by periodical external actions].

Amoeboid locomotion of huge unicellular organism, the Physarum polycephalum plasmodium, is stipulated by endoplasmic flow, which is produced by spatially highly coordinated rhythmic contractions of the ectoplasm. To describe the self-organization of the plasmodial contractile activity, we proposed a mathematical model, which is based on the hypothesis of positive feedback between the deformation of the cytoskeleton and release of a chemical regulator of the active contraction. A nonautonomous analogue of this model was used to study the synchronization of mechanochemical auto-oscillations by periodic gradient of the external pressure.

[Electrostatic interactions in catalytic centers of F1-ATPase].

The first part of this paper is a brief review of works concerned with the mechanisms of functioning of F0F1-ATP synthases. F0F1-ATP syntheses operate as rotating molecular machines that provide the synthesis of ATP from ADP and inorganic phosphate (Pi) in mitochondria, chloroplasts, and bacteria at the expense of the energy of electrochemical gradient of hydrogen ions generated across energy-transducing mitochondrial, chloroplast or, bacterial membranes. A distinguishing feature of these enzymes is that they operate as rotary molecular motors.

[Radionuclide diagnosis of right ventricular myocardial infarction].

The diagnostic capacities of 99mTc-pyrophosphate plane myocardial scintigraphy versus 99mTc-pyrophosphate single photon emission computed tomography (SPECT) were compared. Recording right precordial ECG leads showed that 26 patients had right ventricular myocardial infarction (MI)-typical changes as ST-segment evaluation, followed by abnormal Q wave. Plane scintigraphy indicated a characteristic inclusion of 99mTc-pyrophosphate into the right ventricular myocardium in 18.