Нанесение сокатализаторов на основе соединений переходных металлов на поверхность фотокатализатора Cd[0,3]Zn[0,7]S: воздействие на кинетические закономерности фотокаталитического выделения водорода

В ходе данной работы на поверхность фотокатализатора Cd[0,3]Zn[0,7]S наносили гидроксиды никеля и цинка, сульфиды никеля и меди и измеряли скорость фотокаталитического выделения водорода. Для наиболее активных образцов были изучены зависимости каталитической активности от концентрации реагентов, содержания катализатора и интенсивности излучения и установлены корреляции между наблюдаемыми закономерностями и природой сокатализаторов

Innovative methods of atomic force microscopy in oncology diagnostics

The purpose of this work is to study the morphological forms of erythrocytes, and also pathomorphological changes in prostate gland and kidneys with the use of atomic force microscopy (AFM) during oncological processes. Results: The decrease of discocytes was observed, and the number of transitional, pre-hemolytic and degenerative forms of erythrocytes increased. During the study of the external level of erythrocytes using AFM, it was established that the depth of the discocyte cavity counted by the study of a cell profile changed significantl

Morphofunctional features of erythrocytes in oncourological patients

The malignant tumors are one of the most important problems of urology. The blood sampling was conducted before treatment for research of erythrocytes in patients with cancer of kidney (25 patients), bladder, prostate (25) and in healthy patients (10). The samples of tissue of damaged organs were taken during surgery. The samples were studied with help of raster and scanning electron microscopy with elemental analysis, atomic power microscopy and confocal microscop

Studying effects of external conditions of electrochemical measurements on the photoelectrochemical properties of semiconductors: cyclic voltammetry, impedance spectroscopy, and Mott – Schottky method

In this paper, the dependences of the semiconductors’ photoelectrochemical properties on the experimental conditions were studied for the solid solution of CdS and ZnS, graphitic carbon nitride, and the platinized carbon nitride. The cyclic voltammograms were obtained under different scan rates. The sample investigations were carried out by two ways, at the constant external voltage and varied amplitudes and at different external voltages and the fixed amplitude. The Mott – Schottky dependences were studied at different frequencies. The basic dependences of the changes in the photoelectrode target characteristics on the experimental condition were found. Some recommendations for the correct comparison of qualitative and quantitative photoelectrochemical data were formulated.https://doi.org/10.15826/elmattech.2023.2.01

Application of the similarity theory to analysis of photocatalytic hydrogen production and photocurrent generation

In this research some methods of the similarity theory were quantitatively applied to the description of the relationship between the efficiencies of the photocatalytic hydrogen production and photocurrent generation for the first time. Two possible similarity criteria, namely, such as the ratio of the number of electrons involved in the photocatalytic reaction to the generation of photocurrent ones and the ratio of energies transformed in the case of photocatalytic hydrogen evolution to the photocurrent, were obtained by the dimensional analysis. The literature data allow checking the first criterion. The application of the first possible similarity criterion to the samples with different chemical nature, solid solutions, series, in which the synthesis time or the ratio of catalyst components, electrolyte amount or its nature is changed, was analyzed. It was shown that the ratio of electrons may serve as the similarity criterion only under the conditions of geometric and physical similarities

Net resources in the treatment of the thermal injury : reality and the prospect

Today, under the conditions of the opened possibilities of using the Internet- resources, obtaining medical information became accessible not only doctors, but also patients. Is utilized we entirely the possibility of the attraction of key personnel for the consultation of heavy patients, consideration of the questionable cases? What recommendations can obtain our patients, using sites of hospitals, they are interested doctor, that do discuss in the chat rooms their under wardship? Are such the deontological aspects of Internet-contact? In this article are examined the possibilities of the net resources, which make it possible to interest potential patient, to obtain immediate consultative aid and to organize medical association around the vital problems of the treatment of patients with the thermal injury.Сегодня, в условиях открывшихся возможностей использования интернет-ресурсов, получение медицинской информации стало доступным не только врачам, но и пациентам. Используем ли мы в полной мере возможности привлечения ведущих специалистов для консультации тяжелых пациентов, обсуждения спорных случаев? Какие рекомендации могут получить наши пациенты, используя сайты больниц, интересуются ли доктора, что обсуждают в чатах их подопечные? Каковы деонтологические аспекты интернет-общения? В данной статье рассматриваются возможности сетевых ресурсов, которые позволяют заинтересовать потенциального пациента, получить немедленную консультативную помощь и организовать врачебное сообщество вокруг наиболее актуальных проблем лечения пациентов с термическими поражениями

New approaches to the study of elementosis in obstetrics

To study macro- and micronutrients in the tissues of the placenta, umbilical cord, and uterus, as well as the erythrocytes of the mother-placenta-fetus system during pregnancy against the background of thyroid gland (TG) pathology of various origins, diabetes I, and gestational diabetes mellitus (DM

Photoelectrochemical Properties of Pt- and Ir-Modified Graphitic Carbon Nitride

Received: 08.04.2024. Revised: 27.04.2024. Accepted: 27.04.2024. Available online: 07.05.2024.0.5 M Na2SO4 is an ideal electrolyte for testing g-C3N4-based photoelectrodes.Pt- and Ir- modified samples are more active than ones modified with Ir and Pt simultaneously.Noble metal deposition leads to the increase in open circuit voltage.In this work, the photoelectrochemical properties of g-C3N4 modified with Pt, Ir and Ir/Pt bimetallic co-catalysts were studied. All prepared photoelectrodes were tested in a two-electrode cell by cyclic voltammetry, impedance spectroscopy, and the Mott-Schottky method. First, the optimal electrolyte (triethanolamine, NaCl, NaOH, Na2SO4) was selected. The highest photocurrents were recorded in 0.5 M Na2SO4. This electrolyte was used for the subsequent tests. Second, the photoelectrodes loaded with the noble metals are studied. It was shown that in case of monometallic co-catalysts, the deposition of noble metal is accompanied by the decrease of the shortcircuit current density and the growth of open-circuit voltage. The simultaneous presence of bimetallic co-catalysts can significantly affect the semiconductor electron structure and photogalvanic properties. Some correlations between the short-circuit current density and the oxidation state of the noble metals were found. A linear correlation between Pt0/Pt0+Pt2+ and Jsc was observed. It was also shown that the presence of iridium in Ir3+ form favors the photocurrent generation. The highest values of the photocurrent were obtained for g-C3N4 and were equal to 0.57 mA/cm2.This work was funded by the Russian Science Foundation (Grant No. 21-13-00314; https://rscf.ru/en/project/21-13-00314/).The authors thank Sidorenko N. D. for the preparation of Ir-containing photocatalysts, Dr. Vasilchenko D. B. for the synthesis of Pt-contained samples and g-C3N4, Dr. Saraev A. A. for the XPS analysis

Pathomorphological aspects of thermal trauma

The majority of people face with unfavorable influence of thermal factors of environment. The thermal trauma can be a cause of injury and death of subjects. One hundred twenty rats were subjected to influence of temperature 28, 38, 48°С in duration of 5 min in thermal camera. Brain, liver, kidneys, heart, skeletal muscles were studied with help o f light, raster and scanning electron microscopy with elemental analysis. The overheating at 38°С leaded to formation of quick adaptation to heat, directed to preservation of transport and protidosynthetic functions, as well as to development of disadaptative processe

Cell wall functional activity and metal accumulation of halophytic plant species Plantago maritima and Triglochin maritima on the White Sea littoral zone (NW Russia)

The presented study supplements the knowledge on ion-exchange capacity, swelling capacity (elasticity) of the plant cell wall, and the accumulation of heavy metals in halophytic species Plantago maritima and Triglochin maritima in the tidal zone of the White Sea western coast. The littoral soils of the coastal territories are sandy or rocky-sandy, medium and slightly saline with poor content of organic substances, Mn, Zn, Ni, and Pb. Studied soils are considered as uncontaminated by heavy metals because they contain background amounts of Fe and Cu. Sea water is significantly polluted by Fe (3.8 MPC) and Ni (55 MPC), has poor content of Zn and Cu and background level of Pb and Mn. The coastal dominant plant species P. maritima and T. maritima were characterized by intensive metals accumulation which was reflected in the coefficient of biological absorption (CBA) of metal by a whole plant. For P. maritima the following metal accumulation series was obtained: Cu (3.29)> Zn (2.81)> Ni (1.57)> Pb (1.30)> Mn (1.21)> Fe (0.97), and for T. maritima: Ni (3.80)> Fe (2.08)> Cu (1.91)> Zn (1.84)> Pb (1.51)> Mn (1.31). Roots accumulated 50–70% of Ni, Cu, Zn, Pb and Mn of the total metal content in the plant while leaves and stems contained 30–50%. Fe was allocated mainly in the roots (80%). The ion-exchange capacity of the plant cell wall for P. maritima and T. maritima was established as follows correspondingly: 3570–3700 and 2710–3070 μmol g-1 dry cell weight per leaf; 2310–2350 and 1160–1250 μmol g-1 dry cell weight per root