Dielectric properties of the tissues with different histological structure: Ex vivo study

This study aimed to estimate the dielectric properties of tissues with different histological structures. For this, specimens of fibrous (n=9), muscular (n=7), and fatty (n=11) human tissues were studied. The estimation of dielectric permittivity and conductivity of these specimens was tested with a program and apparatus device for near-field resonance microwave sensing, including 5 applicators with different depths of study. Results of the study demonstrated that this technology can visualize the shape, localization, and linear decisions of biological objects. The currently used method allows distinguishing the tissue histological type. It was stated that fibrous tissue has a maximal level of median and highest dielectric permittivity, and the minimal value of this parameter was fixed for fatty specimens (in 4.26 and 4.53 times lower than in fibrous one, respectively). Muscular tissue has an intermediate value of dielectric permittivity, approaching a level close to fibrous tissue

The Study of Dielectric Properties of Biological Tissue under Thermal Modification in vitro

The aim of this paper is to study the dynamics of the dielectric properties of the tissue in the experimental controlled thermal modification. Material and methods: the experiment was performed on equal in volume and mass samples of intraoperatively removed tissue of Palmar aponeurosis (n=8). The thermal effect was simulated by placing tissue fragments in a thermostat (processing time – 5 min., temperature – 60 C). Duration of exposure after thermal modification was 5 min. Dielectric properties of tissues was determined using an original hardware-software complex for near-field resonant microwave sensing. Results: the study made it possible to verify the shifts in dielectric properties of the tissue that occur under short-term exposure to high temperature in vitro. It is shown that the dielectric permeability and conductivity of the biological object are significantly reduced under the influence of this factor, which is primarily due to a decrease of its hydration degree

Assessment of the Action of Сold Helium Plasma on Metabolic and Physico-chemical Parameters of Rats Blood

The aim of this paper was to study the effect of cold helium plasma on the parameters of oxidative metabolism and crystallogenic activity of rat blood plasma. Material and methods: The experiment was performed on 20 male Wistar rats divided into control (n=10, without manipulation) and main (n=10) groups. Animals of the main group underwent a course, which included 10 daily procedures for processing a pre-epilated area of the back skin (area – 10% of the body surface) with a stream of helium cold plasma (duration – 1 min.). Upon completion of the course, the intensity of lipid peroxidation, total antioxidant activity, malon dialdehyde level and superoxide dismutase activity were determined in the blood of all rats, and crystallogenic properties were evaluated. The conjugation of potential shifts was carried out by correlation analysis. Results: It was found that cold helium plasma transforms oxidative metabolism of blood plasma and its crystallogenic properties, acting as an agent with moderate antioxidant properties and a stimulant of dehydration structuring. In this case, the antioxidant effect is realized, among other things, due to the activation of superoxide dismutase