Variations in genome fragments coding for RNA polymerase in human and simian hepatitis A viruses

AbstractThe genome of hepatitis A virus (HAV) isolated from spontaneously infected African vervet monkey (Cercopithecus aethiops) has been cloned and partially sequenced. Comparison of genome fragments (1248 and 162 bp) from the 3D (RNA polymerase) region with the corresponding parts of human HAV genomes revealed a high degree of heterogeneity: there were altogether 257 nucleotide changes leading to 44 substitutions in predicted amino acid sequence, i.e. 89% amino acid identity. This divergence is considered to be significantly greater than genomic variations usually found among human HAV strains, where amino acid identity in the 3D region is over 98%

Research of low noise pHEMT transistors in equipment for microwave radiometry using numerical simulation

The numerical impact modeling of some external effects on devices based on AlGAs/InGaAs/GaAs heterostructures (pHEMT) was carried out. The mathematical model was created that allowed to predict the behavior of the drain current depending on condition changes on the heterostructure in the barrier region and to start the process of directed construction optimization of the devices based on AlGaAs/InGaAs/GaAs pHEMT with the aim of improving their noise characteristic. © Published under licence by IOP Publishing Ltd

The improved algorithm for human body internal temperature calculating by multi-frequency radiothermography method

An improved algorithm for calculating the temperature and depth of a cancerous tumor in the depth of the human body by the method of multi-frequency multi-channel radiothermography is considered. An improved model is presented to describe the processes of receiving the human body's own radiothermal field by a multi-channel multi-frequency radiothermograph. The possibility of simultaneous calculation of temperature, the depth of the location under the skin and the size of the tumor is analyzed. The conditions for determining these values depending on the parameters of the tumor and the radiothermograph are investigated. The maximum possible depth of tumor detection is determined depending on the parameters of the radiothermograph and the thermal contrast in the source. The necessity of increasing the number of frequency ranges of the radiothermograph is justified. The results of calculating brightness temperatures at different depths of occurrence and tumor temperature are presented in the framework of an improved model. © 2022 Russian Academy of Natural Science. All rights reserved

Increasing efficiency of GaN HEMT transistors in equipment for radiometry using numerical simulation

The numerical impact modeling of some external effects on devices based on AlGaN/GaN heterostructures (HEMT) was carried out. The mathematical model was created that allowed to predict the behavior of the drain current depending on condition changes in the heterostructure in the buffer region and to start the process of directed construction optimization of the devices based on AlGaN/GaN HEMT with the aim of improving their performances. © Published under licence by IOP Publishing Ltd

A Laser Refraction Analyzer for Eyesight Improvement

Laser refraction analyzers are shown to hold much promise for eyesight assessment and effective treatment of amblyopia, nystagmus, aphakia, visual fatigue, progressing myopia in children and adolescents, and strabismus. They can also be used for vision rehabilitation after work involving eye strain. © 2020, Springer Science+Business Media, LLC, part of Springer Nature

Principles of Construction and Approaches to Further Improvements in Multichannel Multifrequency Radiothermographs

The principles of radiothermograph construction and an algorithm for automated monitoring of the extent of mismatch at the interface between the antenna and biological object media in the process of radiothermometric measurements are considered. The results of implementing this algorithm in the development of a five-channel dualfrequency medical radiothermograph are presented. Further research tasks aimed at improving the noise immunity of multichannel multifrequency radiothermographs are formulated

A Hardware−Software System for Mechanotherapy of Lower Limbs

A device for passive mechanotherapy of lower limbs was developed to meet the demand for automated systems for mechanotherapy. The device provides accelerated rehabilitation after injuries of the musculoskeletal system and strokes. © 2018, Springer Science+Business Media, LLC, part of Springer Nature

A Hardware−Software System for Mechanotherapy of Lower Limbs

A device for passive mechanotherapy of lower limbs was developed to meet the demand for automated systems for mechanotherapy. The device provides accelerated rehabilitation after injuries of the musculoskeletal system and strokes. © 2018, Springer Science+Business Media, LLC, part of Springer Nature

Microwave Radiometry of the Pelvic Organs

The problems of designing a microwave radiometer for thermal monitoring of pelvic organs were considered. Based on mathematical modeling, a waveguide antenna for intracavitary diagnostics was developed. The antenna was tested in various phantoms and biological tissues. The obtained results can be used in various fields of medicine and robotics. © 2019, Springer Science+Business Media, LLC, part of Springer Nature