VARIANT ANATOMY OF THE MAXILLARY SINUS BASED ON MULTISPIRAL COMPUTED TOMOGRAPHY DATA.

The structural features of the paranasal sinuses play a key role in the development of pathological processes within them. The aim of our study was to examine the variations in the anatomical structure of the maxillary sinus based on Multispiral Computed Tomography (MSCT) data. MATERIAL AND METHODS: The study involved 400 individuals aged 18 to 44 years, both male and female. During the study, attention was given to the following topographical and structural indicators: linear dimensions of the maxillary sinus2. The position relative to the nasal cavity, which is also important for reconstructive surgeries and cosmetic procedures. For planning surgical interventions in plastic surgery, the location and prevalence in height of the sinuses were also parameters studied in this work; pneumatization features, which deserve special attention from both researchers and practicing physicians; the average volume, wall thickness, and density, measured as key structural indicators of the sinus. Additionally, these data can indirectly indicate potential risks of complications; the study also determined the dependence of the calculated indicators on gender and age. RESULTS AND DISCUSSION: The maximum average sinus volume was found in men aged 60-74 years and women aged 18-44 years. This measure was 19.05±2.33 x10⁻6m³ and 19.3±2.9 x10⁻6m³, respectively. The minimum average volume was observed in men aged 45-59 years, where it was 13.02±2.3 x10⁻6m³. In the corresponding age group of women, the minimum average volume was slightly higher, at 11.9±2.1 x10⁻6m³. In other groups studied, the average volume values were intermediate between the maximum and minimum values. CONCLUSIONS: The results of this study provide insights into the variations in the structure of the human maxillary sinus based on MSCT data. The average sinus volume indicators were calculated, with a maximum of 19.05±2.33 x10⁻6m³ and a minimum of 11.9±2.1 x10⁻6m³. Additionally, the study identified features of the topographical location of the maxillary sinuses in relation to the external nose.

ANATOMICAL VARIABILITY OF THE ALVEOLAR PROCESS OF THE MAXILLA BASED ON MULTISLICE COMPUTED TOMOGRAPHY DATA.

Modern research methods, widely implemented in routine medical practice, open new horizons for the study of anatomical structures. The maxilla is one of the regions of the human skull that shows significant variability with age and gender. This is due to the peculiarities of tooth eruption and age-related changes in the periodontium and adjacent structures, which undoubtedly affect the structure of the alveolar process, sometimes drastically altering it over time. The aim of our study was to determine the anatomical variability of the alveolar process of the maxilla based on multislice computed tomography data. MATERIAL AND METHODS: The research was conducted based on the results of 400 spiral computed tomography scans of males and females aged 18 to 95 years with detection of the anatomical variability of the alveolar process. RESULTS: The average height of the alveolar process was 14.3±0.99x10^-3 m. The thickness of the wall also showed considerable variability. It was maximal in the middle part and minimal in the lateral part of the wall, measuring 1.905±0.021x10^-3 m and 1.15±0.011x10^-3 m, respectively. CONCLUSIONS: We determined its thickness, density, and identified teeth whose roots are connected to the maxillary sinus. The thickness of the alveolar process correlates with the volume of the sinus, showing a strong negative correlation (r=-0.92). Thus, with larger sinus sizes, the alveolar process has a smaller thickness. According to calculations, there is a correlation between the upper facial index and the size of the alveolar process (r=0.64). In dolichocephalic individuals, the longitudinal size is greater than in brachycephalic individuals, where the transverse size of the alveolar process prevails.

PEDAGOGICAL ASPECTS OF THE IMPACT OF SMOKING ON THE HUMAN BODY BASED ON RADIOGRAPHIC DENSITY INDICATORS OF MAXILLARY SINUS BONE WALLS.

The most effective process of quitting smoking can be achieved through precise and complete identification of the adverse effects on the human body. The aim was to examine the influence of smoking on the density of the walls of the paranasal sinuses. 80 individuals of the young age and both genders were included into the research. Depending on the presence of pathological changes in the sinuses and smoking habits, all participants were divided into four groups. It was found that in the group of smokers without any paranasal sinus pathology, the density is 2.66% lower than the intact group. This figure is significantly higher in patients suffering from rhinosinusitis but not smoking, where it is 45.18%. The maximum difference from the control group is observed in individuals suffering from chronic rhinosinusitis and being smokers, with a difference of 81.03%. Pedagogical aspects of the impact of smoking on the human body based on radiographic density indicators of maxillary sinus bone walls were detected. It has been observed that smoking can exacerbate the negative impact of inflammatory processes in the paranasal sinuses.

[The trends of population general morbidity in the subjects of the Central Federal Okrug of the Russian Federation].

The article presents the results of analysis of indices of total morbidity of population of the Central Federal Okrug (CFD) of the Russian Federation in 2010-2017. The significant differences in indices of total morbidity between the CFD subjects in certain ICD-10 classes were established. The indices of total morbidity of population during study period (8 years) in the Central Federal District factually didn't altered, while dynamics of indices in other subjects was characterized by multidirectionality. The gap in levels of total morbidity of population in the subjects was significant: from 115,123.6 per 100,000 of population in the Kursk Oblast to 194,404.1 per 100,000 of population in the Orel Oblast. The significant difference in rates of increase/ decrease of indices is noted. Thus, in Moscow decrease rate made up to 10%, while in the Orel Oblast morbidity increased up to 13.1%. Besides, in 2017, the Orel Region took a leadership in rate of increasing of total morbidity in such classes of diseases as infectious and parasitic diseases (39.3%), diseases of blood and blood-forming organs (49.1%), diseases of endocrine system (59,1%), diseases of nervous system (26.8%), diseases of respiratory system (28.2%), diseases of musculoskeletal system (16%), malformations (56%). It is very likely that this trend developed under influence of demographic situation in the subject due to significant increasing of percentage of people older than able-bodied age. The city of Moscow occupies leading position in decreasing of rate of prevalence of diseases and last but one place in level of total morbidity being inferior only to the Kursk Oblast. Thus, in Moscow was noted the most significant decreasing of morbidity in classes of infectious and parasitic diseases (26%) and diseases of digestive system (20.6%). The diseases of blood and blood-forming organs (235.2 per 100,000 population) and mental disorders (2353.5 per 100,000 population) were registered the less. The main contribution into trends of increasing or decreasing of indices is made by persons aged 18 years and older (74.1%).

[Morphological Features of the Transgenic Tobacco Plant Shoot Expressing the 3-Hydroxy-3-Methylglutagyl-CoA Reductase (HMG1) Gene in the Direct and Reverse Orientations Towards the Promoter].

3-Hydroxy-3-methylglutaryl-CoA reductase (HMG1) catalyzes the formation of mevalonic acid, the key intermediate of the cytosolic isoprenoid synthesis pathway. The parameters of stem and leaf growth were studied in the transgenic tobacco plants that express the HMG1 gene in both sense and antisense orientations towards the constitutive promoter. The transgenic plant height did not significantly differ from that of the control plants, though the plants carrying the sense copy of the HMG1 gene were considerably taller than plants that carried the antisense gene copy. Plants carrying an extra copy of the HMG1 gene were also characterized by increased leaf area. The number of mesophyll cells calculated per square unit of transgenic plants leaves was smaller than in the control plant leaves, though their volume was not considerably changed in any of the variants, suggesting changes in the cell packing density in leaves.

[Changes in response of neurons in visual area of cerebral cortex of rabbits to flashes of light under the influence of low-intensity physical factors of non-ionizing nature].

The effect of various physical factors (SM F: 460 O; microwave EMF: 6 GHz, continuous mode, 200 microW/sm2; sound: clicks of 50 Hz, 6 db above a threshold of EEG response) on responses of neurons in visual area of cerebral cortex of rabbits to light flashes (1 Hz, 1 ms, 0.62 J) has been studied in experiments on 27 rabbits. The character of changes depended on the indicators for a background and for the response to the isolated action of light. Inhibition, rather than activation, was observed at a significantly higher initial frequency. Effect of the factors of magnetic nature was similar to the action of sound (inadequate irritant for the visual area). Inhibitory reactions were observed more frequently (significant result for the group of neurons), with their amplification at a combined action of irritants (SMF and microwave EMF; SMF and sound). The basic character of changes was limited to the drop in the pulsation frequency at the first phase of activation and to the increase in the latent periods of the first and second active phases. Other indicators for reaction to light flashes actually didn't change.

[Activation of extracellular peroxidase of wheat roots under the action of xenobiotics].

We studied the influence of xenobiotics of various chemical natures, including N,N'-dicyclohexylcarbodiimide, diethylstilbestrol, and chlorpromazine, on the activity of peroxidase, a redox-enzyme that participates in defense reactions of plants. It was shown that the influence of the studied xenobiotics on severed roots of wheat seedlings caused an increase in the permeability ofplasmalemma for K+ and H+ and stimulated the activity of the extracellular peroxidase that forms the superoxide radical anion. It is assumed that the extracellular peroxidase can initiate the transformation of alien compounds on the cell surface, before their entrance into the cells.

[The use of RNA interference for the metabolic engineering of plants].

The metabolic engineering of plants is aimed at the realization of new biochemical reactions by transgenic cells. These reactions are determined by enzymes encoded by foreign or self-modified genes. Plants are considered to be the most interesting objects for metabolic engineering. Although they are characterized by the same pathways for the synthesis of basic biological compounds, plants differ by the astonishing diversity of their products: sugars, aromatic compounds, fatty acids, steroid compounds, and other biologically active substances. RNA interference aimed at modifying metabolic pathways is a powerful tool that allows for the obtainment of plants with new valuable properties. The present review discusses the main tendencies for research development directed toward the obtainment of transgenic plants with altered metabolism.

[Inhibition of agrobacterial oncogenes expression by means of antisense RNA].

Plant's infection with soil bacteria Agrobacterium tumefaciens lead to tumour formation, so called crown galls. The reason of tumorigenesis is integration of agrobacterial genes for phytohormone synthesis auxins and cytokinins in plant genome, the most important of them are iaaM and ipt. Obtaining of transgenic plants able to inhibit these genes expression, creates conditions for producing of plants resistant to crown gall disease. With this purpose single and double transformants of tobacco plants with antisense copies of iaaM and ipt genes under the control of single and double promoters of 35S RNA of cauliflower mosaic virus (CaMV 35S and CaMV 35SS) were produced. Infection with virulentA. tumefaciens strains C58 (pTiC58) and A6 (pTiA6) of all types transgenic plants with antisense oncogenes copies showed essential but incomplete inhibition of these genes expression. After agrobacterial transformations of transgenic plants only "weakened" tumours of various morphology, able to regenerate the whole plants, were formed. The analysis data of inhibition of iaaM and ipt genes expression in formed tumour cells were presented. The results indicate perspective RNA-interference strategy for producing of plants resistant to agrobacterial crown gall disease.

[Effect of plasma membrane ion permeability modulators on respiration and heat output of wheat roots].

A study was made of changes in the rates of respiration, heat production, and membrane characteristics in cells of excised roots of wheat seedlings under the modulation of plasma membrane ion permeability by two membrane active compounds: valinomycin (20 microM (V50)) and chlorpromazine (50 microM (CP50) and 100 microM (CP100)). Both compounds increased the loss of potassium ions, which correlated with the lowering of membrane potential, rate of respiration, and heat production after a 2 h exposure. The differences in alteration of these parameters were due to specific action of either compound on the membrane and to the extent of ion homeostasis disturbance. V20 had a weak effect on the studied parameters. V50 caused an increase of the rate of respiration and heat production, which enhanced following a prolonged action (5 h) and were associated with ion homeostatis restoration. The extent of alteration of membrane characteristics (an increase of potassium loss by roots, and lowering of cell membrane potential) as well as energy expense under the action of CP50 during the first period were more pronounced than in the presence of V50. During a prolonged action of CP50, the increase of respiration intensity and heat production correlated with partial recovery of ion homeostatis in cells. Essential lowering of membrane potential and substantial loss of potassium by cells, starting from the early stages of their response reaction, were followed by inhibition of respiration rate and heat production. Alterations of the structure and functional characteristics of excised root cells indicate the intensification of the membrane-tropic effect of a prolonged action of CP100, and the lack of cell energy resources.

[The influence of plasma membrane ion permeability modulators on superoxide formation and bioelectrical characteristics of wheat root cells].

Changes in superoxide radical formation and bioelectrical characteristics of excised wheat root cells under modification of plasma membrane ion permeability were studied. It was shown that a 2 h treatment of excised roots with valinomycin (Val, 20 microM), N, N'-dicyclohexylcarbodimide (DCCD, 100 microM), gramicidin S (Gr, 20 microM), chlorpromazine (CPZ, 100 microM) caused an increased loss of potassium by cells, lowering of membrane potential (MP) and electrical input resistance (Rin) of the cells. The superoxide formation by excised root cells diminished (under DCCD) or remained at the control level (under Val), which was accompanied by a minor decrease of MP and Rin of the cells, a small increase in potassium loss by excised roots, and in no change of pH of incubation medium. Significant depolarization of plasma membrane, dropping of Rin and essential loss of potassium ions by the cells correlated with a rise in the medium alkalinization and superoxide formation by excised roots (in the presence of Gr, CPZ). Ion channel blocker gadolinium (Gd3+, 200 microM) caused an increase of MP and Rin reduction of potassium loss by cells, and a decrease of pH of the incubation medium, and also enhancement of superoxide formation by excised root cells. It is suggested that upon plasma membrane ion permeability modification the activity of superoxide generating systems depends on the specificity and mechanisms of action of modulators, and is determined by their influence on redox state of plasma membrane as well as by peculiarities of ion transport disturbance.

[Localization of ATPase activity, respiration and ultrastructure of wheat root cells with modulated ion conductivity of plasma membrane]. / Lokalizatsiia ATFaznoi aktivnosti, dykhanie i ul'trastruktura kletok kornei pshenitsy pri moduliatsii urovnia ionnoi provodimosti plazmalemmy.

Changes in the localization of ATPase activity, respiration and ultrastructure of wheat root cells with modulated ion conductivity of plasma membrane were studied. A 2 h treatment of excised root with valinomycin (20 microM), N,N-dicyclohexylcarbodiimid (100 microM), gramicidin S (20 microM) and chlorpromazine (100 microM) caused an increased loss of potassium by cells, a decreased respiration and changes in the localization of ATPase activity and in cell ultrastructure. Differences in the observed changes may be conditioned by different mechanisms of action of the membrane active compounds used. It is concluded that changes in the localization of ATPase activity and ultrastructure may indicate some early specific responses of root cells, whereas the increase in the ion conductivity and decrease in respiration under disruption of ion homeostasis caused by membrane active compounds indicate unspecific responses of cells.

[Changes in lipid composition and respiratory activity of wheat roots treated with inhibitor of phosphoinositide cycle of lithium ions]. / Izmeneniia lipidnogo sostava i dykhatel'noi aktivnosti kornei prorostkov pshenitsy pri deistvii ingibitora fosfoinozitidnogo tsikla ionov litiia.

A study was made of the effect of lithium ions (5 mM LiCl) on the growth and respiration of roots of 2-5 day old wheat seedlings, composition of phospholipids, free fatty acids and sterols, and superoxide radical generation. Significant growth depression was shown in roots treated with lithium, increasing with age of seedlings. The growth of seedlings on a 5 mM LiCl containing medium influenced the lipid composition in roots. In the roots of these seedlings phospholipid contents increased along with a decrease in free fatty acids, and the ratio of sterol/phospholipids, while superoxide radical production was stimulated. Lithium stimulated oxygen consumption of excised roots of 5 day old seedlings. Due to its physical and chemical properties lithium is supposed to be able to disrupt gradients of Ca2+, H+, K+, and to lead to a partial blockade of signal transduction for triggering proliferation via the phosphoinositide cycle. Changes in the lipid composition, increase in the membrane permeability for ions, and respiration of roots of seedlings grown in LiCl-containing medium are presumably associated with growth depression and juvenility of roots.

[Development of Public Health Department with course of economy]. / Stanovlenie i razvitie kafedry obshchestvennogo zdorov'ia i zdravookhraneniia s kursom ékonomiki.

Transition of Russia to marketing economy necessitated reformation of public health system, which, in turn, necessitated economic education of medical staff. I. M. Setchenov Moscow Medical Academy accumulated sufficient experience in the solution of this problem many-year research validated the need in economic education of medical staff under conditions of public health reforms. This paper sums up the results of organization and experimental studies of introduction of public health economy in the curriculum.

[Effect of lithium ions on the growth of wheat roots and the role of phosphoinositide cycle in growth regulation]. / Vliianie ionov litiia na rost kornei pshenitsy i rol' fosfoinozitidnogo tsikla v reguliatsii rostovykh protsessov.

The influence of lithium ions (LiCl in concentrations of 0.5, 1.0, and 5.0 mM) on the growth processes of roots of 2-5-day old wheat seedlings was studied. It was shown that the inhibition of the root growth increased with the increase of LiCl concentration and seedling age. The membrane potential of root cells was lower and the loss of K+ by cells was greater when roots were treated with 5 mM LiCl, compared with the control. The growth inhibition by lithium was decreased by univalent ions, partially by potassium at the beginning of growth and completely by sodium throughout the experimental period. The divalent ions calcium and barium decreased the Li(+)-induced inhibition of root growth by reducing the rate of lithium uptake by cells. Myoinositol, controlled by Li-sensitive inositolmonophosphatase, reversed the Li-induced root growth inhibition in 2-day old seedlings, but did not prevent the inhibition during subsequent elongation. It can be concluded that lithium effects on wheat root growth are mediated by a partial blockage of signal transduction for proliferation (via the phosphoinositide cycle), because of calcium deficiency and caused by modification of ion transporting systems of the plasmalemma, and by disturbance of ion gradients, primarily H+ and K+.

[Energy metabolism in wheat roots during modification of cell surface]. / Energeticheskii obmen kornei psenitsy pri modifikatsii kletochnoi poverkhnosti.

A study was made of dynamics of wheat production, intensity of respiration and changes in bioelectric characteristics of exised roots. Response reactions of two wheat varieties were compared in the process of adaptive reactions. The varieties differed in bioelectric characteristics of root cells in intact seedlings grown in CaCl2 and EDTA containing media. Different changes of membrane characteristics of root cells were observed: in soft wheat MP and Rin increased, but in hard wheat these decreased after a 5 h incubation of excised root. The rate of heat production was at the same level in both wheat varieties, but oxygen absorption of the root cells was lower in hard wheat compared with soft wheat. The rate of respiration of excised roots was stable in EDTA-containing medium. The obtained data allow to discuss more in detail the role of Ca(2+)-ions in the regulation of cell functions under formation of adaptive processes as the tissue level.