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The study presents the results of the experimental action of laser radiation with a wavelength of 532 nm in continuous contact mode on biological tissues with different optical properties. The width of the ablation and coagulation zone, the degree of vaporization of various types of tissues were evaluated. Good coagulation properties of the laser are established when exposed to pigmented tissues. However, the pronounced color dependence characteristic of a given wavelength requires careful selection of the biological objects that are suitable for optical properties. Objectives: An experimental evaluation of the effects of a laser with a wavelength of 532 nm in a continuous contact mode on tissues with different optical and mechanical properties. Materials and methods. We carried out an experimental study of the effects of a laser with a wavelength of 532 nm in a continuous contact mode on biological tissues with different optical and mechanical properties. The crater width and side coagulation zone were measured using an operating microscope and a glass slide with a scale value of 0.1 mm. The tissue samples were weighed before and after the application of a point impact. The increase in laser power contributes to an increase in the width of the incision and the coagulation zone. A more pronounced adhesion of the tissue to the fiber end was noted when exposed to the liver tissue of cattle, which causes smaller values of the ablation zone width in comparison with the muscle tissue of the chicken and is reflected in high values of the error of the mean values. The greatest weight loss with a 2 seconds point impact at a power of 5 W was determined on the muscle tissue of the chicken. Conclusions. Good coagulation properties of the laser have been established when exposed to pigmented tissues, however, the pronounced color dependence characteristic of a given wavelength requires careful selection of the biological objects suitable for optical properties.

During pregnancy the work of many organs and systems is changes. This changes lead to the appearance of qDuring pregnancy the work of many organs and systems is changes. During pregnancy, numerous physiological changes occur in the organism of a woman: many organs and systems change their operation, which results in qualitatively new conditions characteristic only for gestation period. The paper provides the analysis of specific characteristics of duration of nasal mucociliary clearance in the pregnant women. The objective of the study is the analysis of Anderson saccharine test duration in pregnant women. The study covered pregnant women observed at the outpatient consultation room of Pavlov First Saint Petersburg State Medical University at the period from September to November 2017. The study covered 34 pregnant women aged 25-41 years (31.2±1.1) at gestational age of 4 to 36 weeks and 10 non-pregnant women aged 23 to 42 years (32.5±1.5). The study included the assessment of complaints, history taking, otorhinolaryngological examination, the change of mucociliary clearance duration. The analysis of the average duration of mucociliary transport in the group of pregnant women with vasomotor rhinitis has proven that the average duration was 25.8 ± 11.4 min, in the allergic rhinitis group the mucociliary transport duration was 31.2 ± 4.6 min. In the healthy pregnant group this indicator averaged 14.5±4.5 minutes, which is reliably lower than in the study group (p ≤ 0.05). In the group of non-pregnant women, this index was reliably lower than in the pregnant group and averaged 12.2±1.2 min (p ≤ 0.05).