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Biomedical subjects

T I Baranova

Publications and source records attributed to T I Baranova.

7 recordsLinked to original sources
PubMed2004

[Characteristics of the human cardiovascular system in the human diving response].

Comparative-evolutional research of diving response showed that mechanisms of its expression had much in common in humans and in animals. Firstly, it involves a reflex bradycardia, vasoconstriction of peripheral vessels, and blood flow centralization. But, unlike animals whose diving response has some typical species peculiarities, human diving response is rather diverse. Four types of cardiovascular system response to face submersion were revealed: over-reactive, reactive, paradoxical, and nonreactive. These types were chosen according to the bradycardia character. It is also supposed that the occurrence of individual maximal R--R-interval, while serving as a signal to apnea stopping, is among the reasons of apnea activity limitation.

Adolescent↗
PubMed2004

[Psychosomatic factors of resistance to hypoxia].

During formation of human long-term adaptation to cold-hypoxic influence, the some dynamics of psychological mechanisms contribution was revealed. On the first step of adaptation process, emotional-volitional personal peculiarities are significantly contributing; on further steps, communicability and general learning abilities are gaining importance. Anxiety, tenseness, diffidence and too strong self-control limit the hypoxic resistance far before restriction of physiological markers of the organism's functional abilities. Adaptation to cold-hypoxic effect contributing to organism stress-limiting system is believed to help experiencing extreme somatic and psychic loads by the people from psychological risk group.

Adaptation, Psychological↗
PubMed2003

[Mechanisms of human adaptation to hypoxia].

The effects of adaptation to cold-and-hypoxic exposure on the cardiovascular system, lipid peroxidation and concentrations of adaptogenesis involved hormones were studied in male students. The two weeks cold- and hypoxic training was shown to be accompanied by a significant increase of apnea duration, reduced velocity of bradycardia development and a more rapid ECG post-cold and- hypoxic exposure normalization, as well as by inhibition of activation of adrenal cortex and thyroid gland after stress of different nature. The changes of the character of influences between the indices under study, were demonstrated. The correlation analysis showed an increase of the human's adaptive potential and a decrease of its dependence on the adrenal cortex hormones.

Adaptation, Physiological↗
PubMedDate not supplied

[New methods of evaluation of the human-operator reliability].

New methods to evaluate the human operator reliability were tested with participation of 27 students of the Air Traffic Control Faculty at the Civil Aviation Academy. One of the proposed criteria is reactivity of the sympathetic cardiovascular regulation as determined during a cold hypoxic-hypercapnic exposure. By this criterion, the subjects divided into a reactive and a super-reactive group. Subjects of the "reactive " group demonstrated much better efficiency on a simulator, whereas subjects of the "super-reactive" group developed an inadequate sympathetic reaction to the rest-to-work transition revealed by a high activation of the parasympathetic component. Information perception was rated with the method of competing fields of vision aimed at evaluating the plasticity of the higher nervous system.

Aerospace Medicine↗
PubMedDate not supplied

[Levanase from Fusarium solani-68].

Extracellular levanase was isolated from the culture of Fusarium solani-68 by ammonium sulfate precipitation at 0.8 saturation and purified in part by Sephadex G-150 gel chromatography. Levanase showed maximum activity at pH = 6.0 and t = 45 degrees C. The levanase reaction (hydrolysis of high molecular levane with a molecular weight of 1--5 min) reached a maximum rate at a polysaccharide concentration of 6.7 mg/ml, Michaelis constant being 1.5 X 10(-6) M. Levanase remained stable at pH 5.4--7.5 and temperature 40--45 degrees C.

Bacterial Proteins↗