[Method for study of phase transitions in evaporating drop and its application for evaluation of physical-chemical properties of water and water solutions].

Spatial-temporal crystallization features of inorganic chlorides in evaporating drops of water solutions, considering solid surface wettability, were studied using a microscopic technique and the acoustical impedansometry. Physical-chemical mechanisms responsible for the difference in "dynamical portraits" of distilled water and salt solutions, as well as relaxation effects in water were discussed. The study demonstrated the potential use of a drying drop method in registration of changes in water properties under the action of physical and chemical factors.

[Dynamics of the mechanical properties of drops of biological liquids during drying as a reflection of the features of selfassembly of their components from the nano- to microlevel].

It has been shown that the dynamics of the molecular self-assembly of the components of liquids drying in the form of drops on a solid moistened surface contains information about their composition and structure. The physical mechanisms of this phenomenon have been considered. A method of recording this dynamics and retrieving useful information has been suggested.

[Shaping processes in drying drops of serum in norm and pathology].

The results of physical and mathematical simulation of the drying process for colloid liquids under different initial conditions were considered. It was shown that the concentration and stability of a colloid solution play an important role in the shaping of drying drops. Possible mechanisms of the formation of morphological differences in dried drops of serum in healthy and ill people are discussed.

[Changes in dynamics of phase transitions in various liquids by recording of acoustic mechanical impedance of a drying drop].

A method of studying multicomponent liquids is proposed, which is based on recording the dynamics of the acoustomechanical impedance of a drop that dries up on the surface of a quartz resonator oscillating with an ultrasound frequency. The magnitude of the acoustomechanical impedance is an integral characteristic of the physical properties of the drop such as viscosity, composition, surface tension, moistening, and inner structure. Using liquids of different types as an example, it was shown that each liquid possesses its individual "portrait", which is determined by the phase transitions.

[Feasibility of predicting the dynamics of human body mass].

An original mathematical model of human energy exchange was developed and implemented on a PC. Energy exchange of healthy volunteers on a free diet and physical activity was simulated by inputting examinees' individualized parameters in the model: total body mass, fatty and lean tissue, nutritional energy capacity, power inputs. The main purpose was to study the reliability of prediction of the time course of total body mass with relation to a dietary caloric value and physical activity of an examinee, which was found to be necessary for working out an optimum metabolic diet, e.

[New approach to the study of erythrocyte aggregation].

A study was made of the possibility of inducing red cell aggregation with the substances that change the shape of the cells. It was established that crenate agents stimulate red cell aggregation and substantially increase the viscosity of their suspension. A distinct correlation was shown to exist between the changes in the red cell shape and intensity of changes in the rheological properties.

[Propagation of impulses through the continuous heterogeneity of an excitable medium].

A simple method of analysing dynamic processes during pulse propagation is described. A change in duration of pulses and interpulse intervals in the course of propagation is taken into consideration. It is shown that due to inhomogeneity the excitation fronts are grouped into peculiar "cluster" moving at a low rate.

[Model of an excitable medium in which may exist several stable impulses of different duration].

It is shown how with the help of minor changes of the type of non-linear function (corresponding for example to the current voltage characteristics of the active biological membrane) a non-monotonous relationship between the excitation pattern velocity and the value of the slow variable is obtained in a model of the excitable medium. In such a model several steady impulses may exist which propagate with equal velocity, but having different duration.

[Non-stationary processes in monomeric excitable media. III. Complex states in autoscillatory excitable media].

Stability of homogenous autooscillations in a distributed model of excitable medium is considered. The criterion of stability is found. It is shown that in the unstable state the system develops towards unhomogenous distribution of intermediates in the space.

[Non-stationary processes in monomeric excitable media. I. Division of the arrested excitable front].

Characteristic unstationary processes in a distributed model of the excitable medium concerned with the stopping of the excitation front are considered. Conditions are determined necessary for a periodic division of the front.

[Calculation of wave velocity in an excitable medium].

Analytical descriptions for the form and velocity values of sharp fronts in the impulse propagating in excitable medium are derived. In initial equations the form of nonlinear function is prescribed by the polynom of the third of fifth power.

[l model of a leading center].

Periodic solutions are obtained for the distributed model of the excitable medium concerned with the decay of stopped excitation fronts. Such solutions make it possible to consider the initiation of the leading centres in a excitable medium.

[Formation of impulses in an excitable medium].

The paper deals with the evolution of initial perturbation in an active distributed system, described by non-linear equations of a diffusion type. Division of all movements into the less than slow greater than and less than fast greater than ones in time and space makes it possible to give a simple analytical description of all the stages. The following cases are possible: a) Initial distribution limited in space falls into two diverging impulses, each of them consists of two sharp fronts connected by slow movements.