Development of oral cancer tissue-mimicking phantom based on polyvinyl chloride plastisol and graphite for terahertz frequencies.

Significance: A new concept of a biotissue phantom for terahertz (THz) biomedical applications is needed for reliable and long-term usage.

Aim: We aimed to develop a new type of biotissue phantom without water content and with controllable THz optical properties by applying graphite powders into a polyvinyl chloride plastisol (PVCP) matrix and to give a numerical description to the THz optical properties of the phantoms using the Bruggeman model (BM) of the effective medium theory (EMT).

Approach: The THz optical properties of graphite and the PVCP matrix were measured using THz time-domain spectroscopy, which works in the frequency range from 0.

[Complex approach to the complicated forms of colorectal cancer].

The results of the colon cancer treatment with the use of laparoscopic surgery and different radiotherapy regimens were compared. 75 patients were observed. The main group consisted of 38 patients, who were operated on laparoscopically and had received neoadjuvant radiotherapy course.

[Hypolipoproteinemia and secondary role of atherosclerosis in the development of ischemic heart disease in patients with polycythemia vera].

Relationship between presence of coronary heart disease (CHD), coronary risk factors (parameters of lipid transport system and hypertension) and disturbances of microcirculation was studied in patients with myeloproliferative blood disease Polycythemia Vera (PV). Probability of tissue (including blood vessel wall) cholesterol accumulation was estimated by measurement of its content in skin surface layers. PV patients (n=55, including 27 patients with CHD) had predominant hypolipoproteinemia with normal proportion of various lipoprotein classes.

[Amiodarone-associated thyroid dysfunction: prevalence and possibilities of correction].

During 1 year of amiodarone intake development of amiodarone-associated thyroid dysfunction was observed in 25% of patients (hypothyroidism and thyrotoxicosis in 19.2 and 5.8%, respectively).

[Erythrocyte cholesterol content in polycythemia vera: relation to ischemic heart disease].

Relative cholesterol content and its distribution between erythrocytes and plasma were studied in 34 patients with polycythemia vera (PV) both with and without concomitant coronary heart disease (CHD). Deformability of erythrocytes, disturbances of microcirculation (blood flow fragmentation, decrease of capillary density) were also assessed. Erythrocytes cholesterol/phospholipids molar ratios (0.