Topicality and demand of the subject of dissertation. Researches of human population genomic variety and scenarios of its genetic pool formation arc one of perspective directions of modem genetics. Prompt progress in this field has allowed defining the basic routes of continents settlement. However the information about Central Asian (CA) populations even on «classical» genetic markers has accidental, fragmentary character, and requires additional large-scale investigations. Besides, according to historical, archeological, paleontological and some anthropogenetic studies, given region was playing certain role in ancient moving of modem human ancestors throughout Eurasian continent. Therefore it is extremely important to summarize and perform complex assessment of new and collected data on Central Asian populations as practically there arc no multivariate analyses studies of given region as a complex population system.
In studies of human population genetic structure arc usually used various approaches allowing understanding concept of populations subdivision and character of genetic relationships between them. Among these techniques the prominent place belongs to approaches based on an assessment of genetic distances between populations with their subsequent analysis by multivariate statistics methods. For even more compelling picture of the relationships between the populations on tree diagram we composed «the genetic landscape» of area, where the description of population genetic structure is presented by equally spaced figures consistently consolidating populations according to their genetic distances from each other and thus creating a genetic landscape. This approach is not only a tool for elementary population boundary detection, but also can be effectively used for identification of borders and sizes of population as naturalistic unit.
Multigcnctic landscape is a collection of different genetic systems which arc specific to the region and ethnic groups, which have their geographical areas, their geographical, historical and cultural boundaries. Gene flows arc run through these conventional boundaries, but they arc less intense than in the limits of area. These limits arc ambiguous and fluid, but it is real. You can identify them by studying, for example, the structure of marriage migration. Therefore anthropogenesis of different populations will inevitably differ from each other. Ethnogenetic composition tends to change over time, from generation to generation, and hence there is a need to understand the structure of the genepool, not only at a given time, but also in the study of genetic processes that form and reform the gcncpooL In this regard, the studying of multigcnctic landscapes is in close contact with the demographics, medical and genetic ecology, anthropology, ethnology, archeology and history of the peoples, that is, with a range of areas, not only natural, but also the humanities knowleges.
Study of genomic diversity is important not only to address questions of origin and genetic history of different ethnic groups, but is also the basis for molecular epidemiology of hereditary and multifactor diseases. Each region is characterized by a specific set of common genetically determined diseases. To understand the causes of the prevalence of disease in different regions, and to develop approaches to their early DNA diagnosis and effective prevention, initially it is necessary to conduct population-based studies, which determine the development of the disease.
Purpose of research is to implement a comprehensive description of the structure of indigenous Central Asian populations genetic pool, examine demographic, phylogenetic and evolutionary features of Central Asian populations through the analysis of genetic variety of mtDNA, Y-chromosomal (NRY), autosomal, X-chromosomal microsatcllites and immunogcnetic variants of Helicobacter pylori (H.pylori) and hepatitis В virus (HB V).
To achieve this goal the following tasks of research is solved:
specification of immunogcnetic variants of H.pylori and HBV, allocated at the patients in Central Asian region, with the subsequent comparative phylogenetic analysis of H.pylori and HBV regional versions with those in other regions of the world;
examination of genetic variety and degree of genetic differentiation of Central Asian populations according to classical population-genetic objects -polymorphisms of mtDNA, Y-chromosomal, autosomal and X- chromosomal STRs;
assessment of the Western and East-Eurasian lines of population inheritance contribution to Central Asian populations’ genetic pool at regional, ethnic, sub-cthnic levels and in a level of elementary populations;
reviewing of character of regional populations relationships by genetic variety of mtDNA, autosomal, X-chromosomal, Y-chromosomal STRs markers in view of ethnographic, social and linguistic data;
evaluation of sex-specific genetic structure and the social organization according to polymorphisms of mtDNA, autosomal, X-chromosomal, Y-chromosomal markers in the region;
determination of ancient ways of migrations and scripts of formation of Central Asian populations according to mtDNA, autosomal, X-chromosomal, Y-chromosomal STRs markers and immunogcnetic variants of H.pylori and HBV',
evaluation of ethnogenetic position of studied Central Asian populations in the system of genetic pools of Eurasia and the world in general through comparative analysis of all studied population-genetic parameters.
Scientific novelty of dissertational research consists in the following:
for the first time was performed a study of genetic pool structure of 26 Central Asian populations from 6 ethnic groups as complete population systems using a wide range of genetic objects;
for the first time was made an assessment of informativeness of each type of genetic subjects. For the first time was received detailed characteristic of genetic pool structure of indigenous Central Asian population on the basis of variability lines of the spectrum of genetical objects;
for the first time was defined the ratio of Westem-and the East-Eurasian lines in a genepool of Central Asian population and were made an assessments of genetic variety level and genetic differentiation degree of regional populations as a whole;
for the first time phylogenetic analysis of major haplogroups of investigated genetic subjects was conducted;
for the first time the position of Central Asian population in population genetic pool system of surrounding regions and Eurasia in the whole was studied;
for the first time the evolutionary-adaptable mechanisms, necessary in the forecast of formations of multigenic pathologies in region were studied at 6 ethnoses of Central Asian.
CONCLUSION
1. H.pylori from Central Asian territory is similar to Western Europe isolates, and shaped by two ancestral populations genotype Ancestral Europe 1 (dominant) and Ancestral Europe2 and for AE1-genotype Central Asian region probably is the source. H.pylori from the territory of Central Asia form a separate cluster group: close relationship of Tadjik, Uzbek strains and Iranian isolates from the north of Iran is established. Kirghiz isolates were found to be closer to populations from territory of Siberia.
2. High diversity of HBV genotypes in Central Asia was found -4 genotypes (A, C, D, and G). Phylogenetic analysis of Central Asian genotype HBV-with options for other regions of the world showed a close relationship between the dominant genotype D (0,78), the D1-subtype with variants of the virus in Europe, the Middle East and Africa.
3. The rates of genetic affinity for STR-NRY in Kazakhs, Turkmens, Karakalpaks Turtkul at the level of the same lineage were high: 0,58 (p<0,001); 0,34 (p<0,01) and 0,77 (p<0,001), respectively. The coefficients of relationship at the level of clan for Kazakhs, Turkmens, Uzbeks and Karakalpaks from Kungrad and Turtkul were lower: 0,30 (r<0,01); 0,21 (p<0,001) and 0,40 (r<0,001); 0,07 (p<0,05) and 0,09 (p<0,05), respectively. At the level of the tribe, the indicators were negative for all Turkic populations: -0,02 (r<0,05);-0,04 (r<0,001);-0,07 (p<0,01); -0,0011 (r<0,1) and -0,10 (r<0,01), respectively.
4. The analysis of mtDNA HVS-1 showed that total rate of differentiation level for all populations was low: FST=0,013; p<0,0001. Level of diversity between groups was 0,6% (p<0,001) of the total variability. Parameter of genetic differences between Turkic and Indo-Iranian populations made 0,55% (p<0,0283) of the total genetic variability. The rate of genetic differentiation on a sub-ethnic level was significantly expressed in Indo-Iranian group (FST=0,0197;r<0,001) than among the Turkic-speaking (0,3%; p=0,10). In all populations, in general, wasn‟t detected the correlation between genetic and geographic distances at the global level on mtDNA HVS-1: r=0,00682; p=0,502.
5. Analysis of STR-NRY showed that the level of the genetic differentiation between ethnic groups was 5,6% (p<0,02); general differentiation between populations made RST=0,186 (p<0,001). Combined analysis, taking into account the language and way of life of Turkic and Indo Iranian populations, showed the general differences between the two groups – 9,1% Value of genetic differentiation when comparing the ethnos-ethnos was slightly lower than the level within ethnos: 5,6% among ethnic groups, 18,6%, and 13,7%-between populations within the ethnic group.
6. Analysis of heterozygosity (H) and the average number of pairwise differences (p) of mtDNA, were high in nomadic populations (av.H=0,99; av.p=5,29) and farmer populations (av.H=0,99; av.p=5,32). Heterozygosity (H) on Y- chromosome was lower in nomadic groups than in the agrarian – 0,86 and 0,99,respectively (p<0,01). Nomadic populations exhibit a higher level of population differentiation (RST) in comparison with farmers - 0,19 and 0,06, respectively (p<0,01). Indicators of population growth (r) were lower in nomadic populations compared with farmers - 1,004 and 1,008, respectively (p=0,056).
7. The level of genetic differentiation in all ethnic groups was higher on the Y chromosome in comparison with mtDNA. The farming populations showed no significant difference in the genetic differentiation FST (Y)=0,069 and FST (mtDNA)=0,034, while among patrilineal nomadic population the level of genetic diversity was higher in the male line of inheritance - FST(Y)=0,177 and FST (mtDNA)=0,010. Genetic diversity of population structure in patrilineal nomads on autosomal and X-linked markers were: FST (A)=0,008 (0,006-0,010) and FST (X)=0,011 (0,001-0,004) (H0: FST(A)=FST(X); H1: FST(A)>FST(X); p=0,02). In bilinear farmer populations the differences of autosomal and X-chromosomal markers were insignificant: FST (A)=0,014 (0,012-0,016) and FST (X)=0,013 (0,008-0,018 at p=0,36).
8. Analysis of mtDNA indicated that the age of expansion on the territory of Eurasia (τw) declined significantly from East to West (r=0,72; p<0,001). The age of expansion had a pronounced tendency to decrease from 30 thousand years in China to 17 thousand years in Western Europe. Age of expansion in Central Asia amounted to 26 thousand years. Results of expansion analysis on NRY also show a decrease in genetic diversity from the East to the West of Eurasia (r=0,49; p<0,001). In Central Asia this age was 16 thousand yrs. According STRs-NRYBatwing analysis of the minimal age of Uzbek population origin was 1232,71 yrs old (Ne=14088 (6765-23942); α=0,0108 (0,0065-0,0155)).
9. The apportionment of multilocus genetic variations among ethnic and linguistic groups of Central Asian populations showed that more than 98% of all variations were within the population (p<0,0001). Evaluation of the ethnic and linguistic affiliations in the observed variations showed reliable conformity - FST=0,007; p<0,0001 and FST=0,011; p<0,0001, respectively. We didn‟t find evidence of geographical isolation within each of the Turkic and Indo Iranian groups of populations (p=0,363 and p=0,772, respectively).
10. Analysis of multilocus allelic diversity (AR) and heterozygosity (He) showed differences among the Central Asian and other populations in allelic variety (χ2 =105,29; d.f.=25; p<0,0001) and heterozygosity (χ2=67,98; d.f.=25; p<0,0001). Population differentiation at multilocus analysis at populations of Central Asia is more pronounced than in the other regions of Eurasia: in European and Middle Eastern groups pairwise estimation of FST ranged from 0,011 to 0,015 and -0,008-0,021, respectively; in East-Asian groups from -0,011 to 0,046; and finally, in Central Asia these rates ranged from -0,004 to 0,056. Heterozygosity was significantly higher in the group of the Indo-Iranian populations than among Turkic-speaking (He=0,818 and He=0,787, respectively; Z=-4, 55; p<0,0001). According to multilocus analysis all 26 Central Asian populations slightly but significantly differed (FST=0,015; CI99%=0,011-0,018; p<0,01).
The purpose of the study was to determine and evaluate the features of morphological changes in the liver parenchyma of 5-month-old white outbred rats under the influence of anti inflammatory drugs under conditions of polypharmacy.
The object of study for experimental studies was taken 250 white male rats weighing 200-250 g.
The scientific novelty of the research is as follows: polypharmacy of anti-inflammatory drugs negatively affects all parameters of liver structures. Under the influence of polypharmacy, there is a decrease in the absolute mass of the liver, volume and morphological parameters of the liver parenchyma. The decrease in morphometric parameters depends on the number of drugs in polypharmacy; under conditions of polypharmacy, the state of the hepatic capillaries and internal bile ducts, as well as biological membranes, was studied, as a result of which the structural structure of the liver, the development of destruction of the hepatic tissue were studied, and the morphofunctional foundations of this condition were shown.
Implementation of the research results. Based on the obtained scientific results, the morphofunctional characteristics of the liver of rats in the norm and under the influence of polypharmacy were determined:
Approved methodological recommendations: "Methodology for determining the morphometric parameters of the liver during polypharmacy of anti-inflammatory drugs" (Conclusion No. 8n-r / 265 dated 14.03.2022 of the Ministry of Health of the Republic of Uzbekistan) and "Methodology for determining the morphometric parameters of the liver during polypharmacy of anti-inflammatory drugs" (Uzbekistan, Conclusion of the Ministry of Health of the Republic of Uzbekistan No. 8 n-z 180 of 2022), electronic program No. DGU 1038 "Program for studying the comparative characteristics of morphological changes caused by polypharmacy in the liver."
The scientific results obtained in the study of morphological and functional properties and morphometric changes in the structure of the liver under the influence of polypharmacy have been introduced into the practice of the Samarkand branch of the Republican Specialized Oncological and Radiological Scientific and Practical Medical Center of the Samarkand City Medical Association (Order of the Ministry of Health of the Republic of Uzbekistan dated March 14, 2022, 8n-r / 265-No. and conclusion No. 8 n-z 180 of 2022). The implementation of the obtained research data allows developing methods for early diagnosis, treatment and prediction of organopathology by morphological parameters, improving the quality of life and reducing the number of complications.
The structure and scope of the dissertation. The structure of the dissertation consists of an introduction, three chapters, a conclusion and a list of references. The volume of the dissertation was 103 pages.
The morphological features of the formation of the immune structures of the jejunum in newborns and during milk feeding were studied in 12 young rabbits. It has been established that in newborn animals the afferent immune structures of the jejunal mucosa are represented byaccumulations of lymphoid tissue without a definite shape, they are indistinctly limited from the surrounding connective tissue of the lamina propria. Structural and functional zones characteristic of lymph nodules cannot be detected. On the 10th day after birth, against the background of milk feeding, efferent immune structures are determined in the stroma of the villi and crypts, since the number of diffusely located lymphocytes and lymphoblasts increases sharply, lymphocytes are also found between epithelial cells. The noted morphological signs show an earlier development of the afferent link of immunogenesis in the jejunum of rabbits.
Topicality and demand of the theme of dissertation. One of the actual problems of modern physical chemistry and macromolecular chemistry is the study on the development of the fundamentals of synthesis of functional polymers with ion-exchange and complexing properties.
Anion exchange and complexing compounds based fibrous materials have a high specific surface area, which provides a high possibility of sorption and desorption processes. They arc especially effective in removing toxic substances, even at very low content of the latter from the air and water pollution. Of particular interest is the acrylic fiber "Nitron", which is produced by JSC "Navoiazot" (Uzbekistan).
In the Academy of Sciences of the Republic of Uzbekistan, Tashkent Institute of Textile and Light Industry conducted research on the development of fibrous ion exchange materials based on acrylic fiber "Nitron" but they have not been brought to its logical end. In addition, when these studies neglected the study of the physicochemical aspects of the preparation of these materials.
In developing the fundamentals of ion exchange materials obtaining a lot of attention paid to the study of physical and chemical aspects of the synthesis and properties of these high-molecular compounds. These studies due to the fact that they allow you to adjust the processes of synthesis and, therefore, necessary to obtain polymers with required composition and with complex specific properties.
As noted above, to date, no attention was paid to the study of the physicochemical foundations of anion exchangers and polycomplcxons, due to applied research conducted to date in this field of research. In this regard, the study of physical and chemical principles of bases of creation, and the properties of anion exchangers and polycomplcxons based on acrylic fiber "Nitron" arc actual both from a theoretical and practical point of view.
Demand perform of the dissertation is characterized by the fact that modern worldwide technology for extraction of non-ferrous and precious metals can not be realized without the use of ion-exchange materials. These techniques use mostly granular sorbents, while fibrous sorbents comprise just 2-3 % of the ion exchange materials used . Using technology employing ion exchange material from algae and natural brine deposits of oil and gas recovered to 90% of iodine and bromine, lodinc-containing sorbents arc used for disinfection of drinking water from microorganisms and extraction of mercury from wastewater and gas emissions. They can be used for concentrating the processing solutions and biologically active substances in the preparation of catalyst systems nanoparticles metals. It should also be noted that Uzbekistan hitherto not been established as industrial manufacture granular and fibrous sorbents, although such polymers arc widely used in industry.
The purpose of this study is to identify the physico- chemical characteristics of the formation and properties of anion exchangers polycomplcxons based on acrylic fiber " Nitron ".
Scientific novelty of disscrtational research consists in the following:
in the first time studied the kinetics of the interaction of acrylic fiber "Nitron" with nitrogen-containing bases in aqueous and organic media;
shown that due to the high surface area fibers arc modifiable , the reaction rate depends on the concentration of the nitrile groups of the polymer being in the solid surface;
proved previously identified mechanism of the catalytic action of small amounts of hydroxylaminc on the process of modifying of fiber " Nitron " with nitrogen-containing bases;
in the first lime developed a method for producing anion exchangers branched structure by sequential treatment of acrylic fiber " Nitron " with cthylcncdiaminc and dichlorocthanc;
found that the interaction of PAN - fibers with hcxamcthylcnc- and ethylene diamines formed anion exchange fibrous materials having in its composition as a weakly basic and strongly basic functional groups ;
in the first time obtained new polycomplcxons with ampholytic properties by reacting maleic anhydride with amine -modified polyacrylonitrile fiber " Nitron " or by hydrolysis of residual of the nitrile groups modified with diamines of acrylic fiber "Nitron";
established values of the thermodynamic equilibrium constants of adsorption of ions Cr (VI), Си (II), halogens, Arsenazo (III) by synthesized anion exchangers and polycomplcxons and alteration in thermodynamic functions of the process testify to high sorption capacity of these ion-exchange materials with respect to the sorption ions;
Conclusion
1. Values degree reaction of the nitrile group and a nitrogenous base, the activation energy of the process shows that the process of modifying fiber " Nitron " nitrogen-containing bases subject to the usual regularities observed in homogeneous reactions. This effect is due to a high fiber surface area to be modified, allowing the reactants to facilitate access to the nitrile groups of the polymer. (Physical chemistry, High molecular compounds).
2. Kinetic studies of the reaction of acrylic fiber " Nitron " with diamine (hexamethylene and ethylenediamine) showed that the change of physical and chemical parameters of the modification process can be controlled sorption properties, chemical resistance and the strength of the anion exchangers due to network structure of the polymer. It has been established that this modification "Nitron" produces strongly basic anion character especially in organic media. Strongly basic anion exchangers possibility of obtaining a high sorption capacity with graft polycthylcnpolyaminc chain reactions revealed in fiber modification "Nitron " ethylenediamine in the presence of dichloroethane. (High molecular compounds, Physical chemistry ).
3. IR - spectroscopic and analytical determination of the formation of intermediate amidoxime groups in the polymer chains and free hydroxylaminc after substitution reaction proved previously proposed mechanism of the catalytic action of hydroxylaminc on the process of chemical modification of acrylic fiber " Nitron " nitrogen-containing bases . ( Physical Chemistry).
4. Developed conditions of synthesis polycomplcxons reacting maleic anhydride with modified by hcxamcthylcncdiaminc acrylic fiber "Nitron" and with of hydrolysis of residual nitrile groups modified by hcxamcthylcnc- and cthylcncdiamin of acrylic fibers . (High molecular compounds, Physical Chemistry).
5. Alkalinity obtained anion exchange resins depends on the nature of their functional groups. Strongly basic anion exchangers have in their composition cyclic amidine groups and they arc formed by the reaction of polyacrylonitrile fiber with a diamine. The specific surface area obtained fibrous sorbents exceeds by two orders of known surface area granular ion exchange resins, and their crosslinking rate is up to 100 nodes per macromolecule polymer. ( Physical Chemistry )
6. Kinetics and thermodynamics of the sorption of various inorganic and organic ions obtained polycomplcxons sorbents showed that ions of Cr (VI), Arsenazo (111) can be sorbed strongly basic anion exchangers only, and the process of sorption of copper (II) with polycomplcxons occurs not only due to the ion exchange, but also due to chelation. ( Physical Chemistry ).
7. Developed the conditions obtaining bromide complexes of polymers and kinetics, thermodynamics of the sorption halogen anion in synthesized materials was studied. It is shown that the lower the stability of the ion [Bn]’ for ion [J3]'than the ability to form such molecular chlorine ions leads to the fact that almost no molecular chlorine is adsorption, and molecular bromine is absorbed to a lesser extent than the molecular iodine. (Physical Chemistry ).
8. Combined developed iodinated anion exchange materials based on acrylic fiber " Nitron " and chitosan. Insertion of the iodinc-containing chitosan materials, leads to an increase of absorbent capacity. Combined antibacterial dressings have a pronounced anti-inflammatory and antibacterial effect, arc effective for the treatment of necrotic soft tissue diseases. (High molecular compounds, Physical Chemistry).
Actuality. Prevention of visual disability should begin in childhood. To plan high-tech specialized ophthalmic care for young patients, it is necessary to monitor the structure of ophthalmopathology in infants in leading domestic children's medical
institutions. Purpose of the study. The study of the structure of eye diseases in infants based on the materials of the department of ophthalmology of the clinic of the Tashkent Pediatric Medical Institute (TashPMI). Material and methods. A retrospective analysis of statistical coupons of case histories of 685 patients aged 0 to 1 years who were hospitalized in the ophthalmological department of the TashPMI clinic for 2018-2021 was carried out. Results and conclusion. The spectrum of nosological units revealed the
predominance of glaucoma (41.3%) and lens diseases (30.4%). At the same time, it was noted that eye injuries (10.5%), diseases of the eyelids, lacrimal ducts (phlegmon of the lacrimal sac) and orbit (9.2%), although they did not occupy a leading position, nevertheless represented severe acquired lesions that could be prevent. Age-related aspects of nosologies are due to the timing of clinical manifestations, diagnosis and treatment of pathologies, the anatomical and physiological characteristics of the child’s body,
and a decrease in parental control over children.
The modern energy system is largely based on the use of fossil fuels, which makes up almost 90% of the global energy consumption structure. Intensive production of raw materials has a negative impact on the environment. This in turn creates environmental problems. The depletion of available reserves of the main energy resources of oil, gas, coal, ore and other minerals will worsen the energy situation in the world. Today, renewable energy interest to many countries due to increased dependence on imported energy, climate change and environmental protection, high rates of economic development and population growth. The widespread use of renewable energy sources will create socially and environmentally clean energy structures. That is why alternative energy technologies - hybrid cars and electric cars, solar, wind, geothermal energy, bioenergy are developing at a high level. This article discusses current trends in renewable energy, alternative energy sectors in Japan and the stages of development of solar energy, features of solar energy, advances in modern technologies for the use of renewable energy sources and the challenges facing renewable energy sources. Also highlights Japan’s new energy policy and strategy, legislation on energy efficiency, programs and strategic plans, changes in the country's energy policy, diversification of energy resources and current problems of energy security. It also analyzes the prospects for the development of renewable energy sources in Japan, new projects in the field of solar energy and mechanisms for their implementation. And also, scientific conclusions were drawn on the analysis of current trends in the development of renewable energy in Japan.
Subjects of research: associative switching system structure, associative switching system networks, associative switching and routing, their models and design methods
Purpose of work: research and design of switching node models and designing methods of the broadband multilevel N-dimension associative switching networks.
Methods of research: researches based on algebraic system of associative switching, probability theory, queueing theory, group theory, z-transform methods, matrix algorithms, parametric analysis of time-probabilistic characteristics and network stricture optimization.
The results obtained and their novelty: associative switching fabric model based on group theory with alphabet A and substitution system F; switching task solution in the network modules of the associative switching system is represented as multiplication operation of multiplicative algebraic substitution group of matrix elements in RAM and program memory (function domain of Neighbourhood Single Radius NSR); analytical models of associative switching system of the ring and star structures.
Practical value: Formulas for practical design of associative switching system arc obtained. Formulas allow to choosing associative switching system parameters according specified requirements and initial data. It’s defined associative switching fabric application in switching systems have more higher performance in comparison with traditional switching systems.
Degree of embed and economic cffcctivity: results have been implemented to JSC “Uzbektelecom” and into educational program of Tashkent university of information technologies TU1T.
Field of application: dimension, design, realization of associative routing and switching mechanism for access and transport telecommunication networks.
Prevention of visual disability should begin in childhood. To plan high-tech specialized ophthalmic care for young patients, it is necessary to monitor the structure of ophthalmopathology in infants in leading domestic children's medical institutions. Purpose of the study. The study of the structure of eye diseases in infants based on the materials of the department of ophthalmology of the clinic of the Tashkent Pediatric Medical Institute (TashPMI). Material and methods. A retrospective analysis of statistical coupons of case histories of 685 patients aged 0 to 1 years who were hospitalized in the ophthalmological department of the TashPMI clinic for 2018-2021 was carried out. Results and conclusion. The spectrum of nosological units revealed the predominance of glaucoma (41.3%) and lens diseases (30.4%). At the same time, it was noted that eye injuries (10.5%), diseases of the eyelids, lacrimal ducts (phlegmon of the lacrimal sac) and orbit (9.2%), although they did not occupy a leading position, nevertheless represented severe acquired lesions, which could have been prevented. Age-related aspects of nosologies are due to the timing of clinical manifestations, diagnosis and treatment of pathologies, the anatomical and physiological characteristics of the child's body, and a decrease in parental control over children.
The article deals with complex physical and chemical studies of the influence of microfiller on the formation of the structure and properties of lightweight concrete.
The article discusses the essence and main new trends of the regional foreign policy of Uzbekistan in modern conditions. New trends in regional cooperation in the foreign policy of Uzbekistan revealed from the second half of 2016. Based on the analysis of the works of Uzbek political scientists, researchers, as well as specialists, the continuity of forms, methods, and mechanisms for ensuring stability in the Central Asian region is analyzed. It is obvious that all countries equally face the threats of terrorism, religious extremism, transnational crime and drug trafficking, the main emphasis relies on the fact that today the prospects for development stability are inextricably linked with the peace in Afghanistan. It can be seen that Uzbekistan has been resolving regional tensions on all issues, which over the years have accumulated with neighboring countries and there is a real opportunity to discuss problems, develop joint projects identified on the agenda for the region as a whole. The analysis made it possible to establish that in modern conditions, the main trend in the formation and development of regional development institutions is the course towards the integration of functions, structural ties, areas of activity, etc., both at the regional and interregional levels. The article analyzes that regional security is provided by various structures, with diverging and overlapping areas of responsibility, however, in the current conditions, specialized structures, for example, military-political blocs, are beginning to gradually transform into universal structures. Accordingly, the international legal base of regional systems is becoming more complicated, a multilevel set of norms appears. The article shows that regional institutions in Central Asia are being formed to solve regional problems. These processes testify to the degree of development of regional consciousness that such characteristics as mutual accounting and respect for interests, mutual openness and political trust have become inherent in the interstate relations of Central Asian countries. The above processes are only at the initial stage and require constant study.
Миопия является одним из самых распространенных глазных заболеваний в мире и наиболее частой причиной снижения остроты зрения, встречаясь в 12-30% случаев среди офтальмопатологии. Высокий интерес к данной проблеме в последние годы связан с увеличением распространения близорукости среди населения всего мира, а именно, ее высоких степеней от -6,0 дптр и выше.
За последние десятилетия отмечен рост близорукой рефракции, особенно среди учащихся и работающих с компьютером.
Частота высокой близорукости, одной из наиболее тяжёлой рефракционной патологии, по данным разных авторов, колеблется от 6-18 до 27-33,2% [1, 41, 45, 89, 97]. В последние годы привлекает все большее внимание исследователей коррекция ослабленного зрения при близорукости высокой степени, в частности врожденной. Врожденная близорукость в 55-60 % случаев бывает высокой и является одной из главных причин инвалидности по зрению [52]. За последние десятилетия число лиц с близорукостью возросло, всего в мире очки носят около 1 млрд, человек. Близорукость чаще обнаруживается у детей 7-12 лет, усиливается в подростковом возрасте, а в 18-40 лет стабилизируется. Это очень важный аспект, т.к. прогрессирование близорукости в среднем возрасте чаще всего связано с увеличением преломляющей силы оптического аппарата глаза. В последнее десятилетие число людей с миопией в странах Европы увеличилась и составляет 30% -40% всего населения.В странах Юго-Восточной Азии достигает 70% и более. Миопия высокой степени развивается у 2% населения и является одной из необратимых причин слепоты у лиц молодого и среднего возраста. В Европе 8,8% стойкой слепоты связаны с миопией высокой степени, в США она занимает второе место среди причин инвалидности.
Низкая острота зрения у близоруких нарушает их трудоспособность, ограничивает возможность выбора профессии и полноценную жизненную активность. Коррекция миопии высокой степени с целью сохранения полноценной остроты зрения актуальна, как в социальном, так и в научном плане. Лица с близорукой рефракцией нуждаются в очковой коррекции. Наблюдения показали, что, если определенный контингент постоянное ношение очков воспринимает как огромное благо, то значительная часть близоруких лиц, особенно молодые женщины нашего региона, категорически отказываются от ношения очков, обрекая себя на зрительный дискомфорт.
Коррекция ослабленного зрения при миопии - актуальнейшая проблема офтальмологии. Она обусловлена как распространенностью миопии преимущественно у молодых лиц, то есть социальноактивного контингента, так и тенденцией к повышению степени ее в связи с возрастающей зрительной и психологической нагрузкой.
Существующие традиционные методы коррекции зрения при высокой миопии не всегда устраивают пациентов в современных сложных социально-экономических условиях.
Традиционным способом коррекции аметропий является очковая. Более 80% людей с нарушением рефракции предпочитают этот вид коррекции из-за ее доступности, отсутствием серьезных осложнений при ее использовании. Однако, очковая коррекция не всегда применима. Очки трудно переносятся при анизометропии и при высоких степенях аметропий. Есть ограничения по профессиональным состояниям больных. Нередко, даже при хорошей переносимости, они не устраивают больных по косметическим соображениям. Очковые линзы до сих пор остаются самым доступным и распространённым средством коррекции миопии. Самым серьёзным и неустранимым недостатком очковых линз является их влияние на размеры ретинального изображения объекта.Второе обстоятельство, часто заставляющее пациентов обращаться к другим видам коррекции, связано с косметическими недостатками очков. Проблема очков доводит до трагедии молодежь, особенно девушек в Узбекистане, где большинство предвзято относятся к «очкарикам». Кроме того, недостатками очковой коррекции являются: сужение полей зрения, зрительный дискомфорт, вызываемый климатическими условиями, частая смена очков (1 раз в 1 -2 года).
В случаях невозможности или непереносимости очковой коррекции альтернативой является использование контактных линз. От 15% до 18% больных с нарушением рефракции используют этот вид коррекции [35, 36]. Контактные линзы свободны от присущих очковым линзам косметических дефектов и, составляя единую оптическую систему с глазом, практически не влияют на величинуретинального изображения. Тем не менее, ряд обстоятельств (как объективного, так и субъективного характера) часто заставляет пациентов отказываться от ношения контактных линз, в частности:
- так называемые манипуляционные сложности;
- необходимость ухода за контактными линзами;
- потенциальная возможность осложнений, связанных с ношением контактных линз.
Контактные линзы - хотя и являются физиологической коррекцией, но не всегда достигается удовлетворительная адаптация к ним в индивидуальных случаях высокой миопии. Негативное влияние на переносимость и возможные осложнения (кератиты, эрозия роговицы, конъюнктивиты) оказывают особенности климатических условий в регионе Средней Азии, отличающиеся повышенной запыленностью и низкой атмосферной влажностью воздуха, из-за чего контактная коррекция не может быть широко рекомендована.
От 1 до 5 % людей с нарушением рефракции не желают или не могут использовать очки и контактные линзы и решаются на хирургические виды коррекции.
Таким образом, комплексный подход к проблеме оптической коррекции миопии высокой степени в настоящее время осуществляется по следующей схеме: очковая коррекция —► коррекция контактными линзами —» хирургическая коррекция. Каждое последующее звено в этой схеме является более сложным и применяется при безуспешности или невозможности использования более простого способа коррекции. Своевременная коррекция высокой миопии необходима для полноценного развития и функционирования зрительного анализатора, что обуславливает целесообразность проведения рефракционных операций у больных с непереносимостью очковой и контактной коррекции.
В настоящее время сложились два подхода к проблеме лечения близорукости высокой миопии - это применение хирургических методик, направленных исключительно на быстрое достижение рефракционного эффекта и более серьёзное отношение к миопии как к болезни, при которой в той или степени поражаются все структуры глазного яблока [24, 73, 106, 107].
Изменить рефракцию оптических сред глаза можно тремя путями.
Первый путь - экстраокулярный, когда дополнительная оптическая система размещается перед глазным яблоком (очки) или непосредственно на нем (контактные линзы). Этот ставший традиционным путь не предусматривает изменения структуры преломляющих сред самого глаза и может рассматриваться как неинвазивный.
Второй путь - это изменение преломляющей способности роговой оболочки дозированным хирургическим воздействием с роговой оболочки дозированным хирургическим воздействием с помощью ножа или лазерного излучения.
Третий путь - интраокулярный, который предусматривает изменение рефракции глаза с помощью операций со вскрытием глазного яблока.
Обилие разработанных к настоящему времени методов воздействия на оптику глаза и конкретных оперативных вмешательств неизбежно ставит как перед пациентом, так и перед врачом проблему выбора наиболее адекватного для каждого конкретного случая метода операции.
В настоящий момент приходится констатировать, что идеального и абсолютно безопасного метода хирургической коррекции аметропий не существует, и каждый потенциальный пациент должен быть информирован об этом. Индивидуальный выбор оптимального метода зависит от существующих в стране или регионе возможностей, как в отношении технического оснащения, так и опытности хирургов в проведении данного вида операций, степени и вида аметропии, а также возраста пациента, общего состояния его здоровья и, наконец, его финансовых возможностей.
В настоящее время арсенал хирургической коррекции аномалий рефракции огромен. Как хирургам, так и пациентам предоставлена уникальная возможность, выбирать методы и способы коррекции рефракционных дефектов [2, 3, 8, 50, 64]. Рефракционные операции - понятие собирательное и включает в себя вмешательства, которые могут изменить оптические свойства и параметры различных частей оптической системы глаз (длины оси, силу роговичной и хрусталиковой линз.)
Выбор метода хирургического лечения - актуальная и жизненно важная проблема. От того, насколько точным будет выбор, зависит исход операции, а значит, и социальная, и профессиональная реабилитация пациента.