Место работы автора, адрес/электронная почта: Московский государственный университет им. М. В. Ломоносова ; 119991, г. Москва, Ленинские горы, 1 ; https://www.msu.ru/
Ученая степень, ученое звание: д-р биол. наук
Область научных интересов: Биология
ID Автора: SPIN-код: 5380-5742, РИНЦ AuthorID: 87164
Количество страниц: 16 с.
Approximately 210-250 thousand new cases of renal cell cancer (RCC) are registered annually in the world, which is 2-3% in the structure of malignant neoplasms in adults. In Russia, among tumours of the urogenital system, RCC ranks 2nd after malignant neoplasms of the prostate gland and 1-3rd in terms of the growth rate of morbidity. According to numerous studies, the growth rate of kidney tumour is on average 2.5 mm per year. However, it has been observed that when patients undergo surgical resection of a renal tumour, they are often found to have masses that are significantly larger than those predicted. The reasons and mechanisms for this dramatic increase in the size of renal masses remain unclear at this time. In this regard, the ‘explosive’ growth of renal tumours has been suggested. In this paper, haematoma fluid (HF) samples from different sites of renal tumour, obtained directly from the tumour during surgery to remove the mass, are analysed by infrared spectroscopy to study the changes occurring in blood clots from the time of haematoma formation in order to assess the ‘age’ of the tumour. It is assumed that in the case of ‘explosive growth’ of the tumour there is simultaneous formation of tumour hematomas located in different parts of the tumour. The IR spectra of HL samples from tumours of different patients, as well as HL from different tumour sites of the same patient were compared in terms of the height of intensity of transmittance peaks at selected wave numbers corresponding to fluctuations of proteins such as fibrinogen and haemoglobin, as well as lipids. The study of the peaks responsible for fluctuations in the deoxygenated state of haemoglobin, methemoglobin and other proteins, lipids and structural changes in these compounds revealed statistically significant differences in the peak area of fibrinogen fluctuations in the spectra of samples from different patients and controls. In addition, correlation analysis between tumour size and the intensity of the peak responsible for fibrinogen νPO oscillations indirectly confirmed the hypothesis of ‘explosive growth’ of renal tumour. Thus, the results obtained in this work confirm that the IR spectroscopy method can be used in tumour ‘age’ studies, and the causes and mechanisms of the abrupt increase in the size of renal masses can be explained by the hypothesis of tumour ‘explosive growth’.
Исследование образцов опухоли почки методом ИК-спектроскопии: проверка гипотезы "взрывного роста" опухоли / С. В. Николашкин, И. И. Колтовской, С. В. Титов, О. В. Тыщук ; Северо-Восточный федеральный университет им. М. К. Аммосова, Республиканская больница N 1 - Национальный центр медицины им. М. Е. Николаева, Московский государственный университет им. М. В. Ломоносова // Вестник Северо-Восточного федерального университета им. М. К. Аммосова. - 2024. - Т. 21, N 3 (97). - С. 59-74. - DOI: 10.25587/2222-5404-2024-21-3-59-74
DOI: 10.25587/2222-5404-2024-21-3-59-74
Количество страниц: 11 с.
Currently, the use of electron microscopes in medicine is developing intensively, including scanning electron microscopes (SEM), which are designed to solve a huge number of problems in various fields with a wide range of electron accelerating voltages and electron beam energies. The development of an SEM with certain emission characteristics, with a range of lower beam energies for the study of biological samples, is an urgent task because modifying the SEM to solve problems in medicine, for example, would make it possible to obtain higher-quality images of biospecimens for diagnostics and monitoring the effectiveness of therapy. To develop new SEMs with certain characteristics, it is proposed to conduct less expensive research using numerical methods based on mathematical models of processes in electron-optical SEM systems. In this regard, this work sets the task of determining the size and shape of the beam, the main emission characteristics of the field electron cathode (FEC) of the SEM, which is under the influence of the electric field that excites electron emission and the external longitudinal magnetic field by studying the movement of the outermost electron of the beam, taking into account the influence of space charge beam electrons, external magnetic field. In the model, the FEC is approximated by a paraboloid of rotation, and the concept of a boundary “outermost” electron is introduced, the trajectory of which determines the shape and size of the beam. The problem of calculating the emission characteristics along the trajectory of the outermost electron of a FEC is solved using a mathematical model that includes the following equations: motion of the "outermost" electron, Maxwell outside and inside the beam, continuity of the current density, Fowler-Nordheim equation. As a result, a system of 18 first-order ordinary differential equations was obtained, the numerical calculation of which using the 4th order Runge-Kutta method allows us to obtain the emission characteristics of the FEC. As a result, it is suggested that it would be feasible to modify SEMs for more effective use in the medical field, taking into account their increasing use in disease diagnosis and the possible improvement of image quality through the development of FEC SEMs with more suitable characteristics.
Математическое моделирование эмиссионных характеристик полевого электронного катода в растровом электронном микроскопе в условиях исследования биообразцов / С. Н. Мамаева, Н. В. Егоров, Б. В. Яковлев [и др.] ; Северо-Восточный федеральный университет им. М. К. Аммосова, Санкт-Петербургский государственный университет, Московский государственный университет имени М. В. Ломоносова // Вестник Северо-Восточного федерального университета им. М. К. Аммосова. - 2024. - Т. 21, N 1 (95). - С. 70-80. - DOI: 10.25587/2222-5404-2024-21-1-70-80
DOI: 10.25587/2222-5404-2024-21-1-70-80
Количество страниц: 10 с.
Павлов, А. Н. Исследование биологических образцов детей с синдромом гематурии методом ИК–спектроскопии / А. Н. Павлов, С. Н. Мамаева, Г. В. Максимов ; Северо-Восточный федеральный университет им. М. К. Аммосова // Вестник Северо-Восточного федерального университета им. М. К. Аммосова. - 2023. - Т. 20, N 1. - С. 42-51. - DOI: 10.25587/SVFU.2023.53.95.004
DOI: 10.25587/SVFU.2023.53.95.004
Количество страниц: 4 с.
For experimental purposes, the blood of children with hematuria syndrome in acute and chronic glomerulonephritis and IgA nephropathy was studied using IR spectroscopy. The results obtained indicate the possibility of using IR spectroscopy as an additional diagnostic method for the differentiation of nephropathies.
Инфракрасная спектроскопия крови детей с синдромом макрогематурии / С. Н. Мамаева, Г. В. Максимов, А. С. Гольдерова, Я. А. Мунхалова, А. Н. Павлов, А. Л. Федоров // Якутский медицинский журнал. — 2018. — N 1 (61). — С. 33-35.
DOI: 10.25789/YMJ.2018.63.10