Biomedical subjects
Publications and source records attributed to V V Gorbunov.
For ergonomic evaluation of aircraft, the authors developed and subjected to flight testing a system automatically processing psychophysiologic parameters of pilots, providing post-flight automated PC processing of values registered during flight--cardiac rhythm, skin and sub-clothing temperatures, pulmonary ventilation and working load.
"Additional task" method was used to evaluate pilot's work load in prolonged flight. Calculated through durations of latent periods of motor responses, quantitative criterion of work load is more informative for objective evaluation of pilot's involvement in his piloting functions rather than of other registered parameters.
The receptor organs of snakes with "thermal vision" were studied with ultra-high-resolution scanning probe microscopy (SPM) at close to in vivo conditions to elucidate their surface morphology and materials properties critical for prospective biomimetic design of "soft matter"-based infrared (IR) sensors. The surfaces of living tissues were scanned under wet ambient conditions in physiological solution, and the resulting parameters were compared with SPM data obtained for chemically treated (formaldehyde-fixed) tissue in ambient air and TEM studies in high vacuum. We found that the microstructural parameters for the living tissue are similar to ones observed for the formaldehyde-fixed snake tissues. However, previous data obtained from TEM analysis in high vacuum underestimated actual dimensions of surface microstructures. The average spacing of the nanopit array observed within receptor surface areas, which was suggested to play a critical role in selective IR adsorption, was determined to be 520 nm. This value is close to the grating spacing required for efficient reflection of electromagnetic radiation characteristic for sunlight without affecting IR adsorbance.
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Pilots wearing summer suit and marine life-saving suit during 6-hour flight were subjects for determination of average weighted skin temperature in order to objectively evaluate human heat state and associated characteristics of operator's activities. The results of measurements aided by devices appeared more adequate, if compared to subjective pilot's estimate.
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Hemofiltration efficacy was assessed in 14 patients with acute renal insufficiency. Purification quality was controlled by the balance of urea as a marker of low molecular mass substances. Ten patients survived. Adequate purification could be attained with the help of hemofiltration disregarding the level of azotemia and catabolism. An indispensible condition for effective treatment was the substitution of an adequate volume of body fluid (approximately 1.2 volume). The effectiveness of the method could be enhanced as many patients tolerated filtration at rate of 200 ml/min and more. A substitution solution was adequately saturated with urea and purification efficacy corresponded to the rate of filtration. In prolonged anuria filtration procedures not less than 2 times a week were considered optimum.
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