Hematological changes in descendants of animals irradiated in different doses

An urgent problem today is not only the study of changes in the stability of the genome of somatic cells, the clarification of the mechanisms of its destabilization under the influence of a complex of environmental factors, including radiation, but also the study of the possibility of hereditary transmission of these changes. In the modern experimental and clinical medicine, the most important problem is the harmful effect of ionizing radiation on the descendants of irradiated parents and the specifics of the effect of radiation on the developing organism. An important aspect of the problem of long-term post-radiation effects is the state of reproductive function and health of the descendants of the irradiated population, due to the physiological characteristics inherent to the mother and child - high sensitivity to the action of ionizing radiation, the consequences of which may manifest after a long period of imaginary well-being. The purpose of the work is to investigate the dynamics of body weight and hematological indiexes in the descendants of intact sexually mature animals and descendants born to animals irradiated at different doses, which were exposed to radiation at a dose of 1.0 Gy. The authors revealed that in descendants born to animals irradiated at different doses, which were exposed to radiation at a dose of 1.0 Gy, it was established that by the 30th day after irradiation at a dose of 1.0 Gy, the general condition of pup rats born from animals irradiated at a dose of 0.5 Gy and exposed to irradiation at a dose of 1.0 Gy is satisfactory against the background of an insignificant decrease in the body weight. This also applies to pup rats born to animals irradiated at a dose of 1.0 Gy, whose general condition slightly improves compared to the previous period of the study. The data obtained showed in the peripheral blood after 1 day in the descendants born to animals irradiated at a dose of 0.5 Gy, after irradiation at a dose of 1.0 Gy, a reduced content of hemoglobin and erythrocytes against the background of an increase in the content of platelets, leukocytes, lymphocytes and reticulocytes in comparison with non-irradiated animals, which was maintained throughout the experiment. Pronounced changes in hematological parameters were observed in the descendants born to animals irradiated at a dose of 1.0 Gy, which were exposed to total γ-irradiation at a dose of 1.0 Gy. The authors suppose their data are in favour of the pronounced adaptationof organisms’ regulatiory systems to ionizing irradiation effect that, firstly, outline the adaptative physiologcal mechanisms and, secondly, show the main launches of pathophysiologcial mechamisns in case of irradiation-induced hematological changes

Test system for evaluation of the influence of the biological activity of substances on the signal system of NF-κB: focus on the derivatives of 3- hydroxypyridine

At the first stage of our study, 11 pharmacological agents-inhibitors of NF-κB in vitro were screened with an estimate of the activity of the p65 subunit in mononuclear cells stimulated by bacterial lipopolysaccharide. The most active substances were: mexidol, ethoxidol and the agent under the code XS-9. Further inhibitory activity against NF-κB pharmacological agents was studied on 4 models: L-NAME-induced endothelial dysfunction, staphylococcal sepsis, acute toxic liver damage and acute pancreatiti

Necessary Conditions for Optimality in Problems of Optimal Control of Systems with Discontinuous Right-Hand Side

We consider the problems of optimal control of a dynamical system whose right-hand side is discontinuous in the state variable and is linear in the control with sufficiently smooth coefficients in each of the half-spaces into which the space is divided by the switching hyperplane. The main attention is paid to the situation where there exist intervals on which the optimal trajectory lies on the switching surface. New nondegenerate necessary conditions for optimality are stated and proved in the maximum principle form. The obtained optimality conditions are compared with the already known conditions

Nuclear factor kappa B as a potential target for pharmacological correction endothelium-associated pathology

The nuclear factor kappa B (NF-κB) is one of transcription factors. A high interest in studying the biological role of the signal system and its contribution to the development of cardiovascular, oncological and autoimmune diseases is obvious. A number of stimuli (proinflammatory cytokines: tumor necrosis factor α, interleukin 1β, ligand CD40 and others) trigger the canonical and non-canonical pathways of NF-κB signaling, which increase the expression of genes regulating synthesis of cytokines and chemokines, cell proliferation and differentiation, angiogenesis, immune reactions and apoptosis. However, pathological activation of NF-κB violates the balance of substances participating in the normal activity of the cardiovascular system. This leads to the development and progression of endothelium-associated pathology and comorbidit

«New Normal» of Students’ Educational Practices in the Coronavirus Pandemic Reality

The article presents the results of qualitative sociologic survey aimed at analyzing students’ subjective evaluations related to “new” educational practices from the perspective of the experience gained in the pandemic period, as well as the dynamics of changes in the content of these evaluations during the year due to the transition to new learning formats. The purpose of the study is to assess the impact of forced online learning on the transformation of traditional educational practices. Following the results of work with qualitative data, the main trends observed in the informants’ answers are shown – increase of academic workload and, as a consequence, the time spent for its performance; absence of former attitude and concentration of attention on the learning material caused by the impossibility to draw boundaries between private and public, that in its turn had an impact on the quality of education and gave rise to new practices of academic dishonesty and cheating; and as a whole, downturn of psychological wellbeing. Main positive moments named by the informants were increase of the capabilities of the educational field and a certain level of comfort in the sphere of everyday life, logistics and work. It is noted that even with the outright victory over the COVID-19 it will be impossible to return completely to pre-covid variant of organization of educational process; whether we like it or not, electronic educational environments have already become an integral part of our life and higher education. The main questions that must be asked now – which of pre-covid and gained practices should be taken into the future, how to find the balance between intramural and online learning formats. Search for solutions depends to a large extent on the success of interaction and cooperation between the direct participants of educational process. Main method of data collection is semi-structured interviews; field works have been carried out in spring of 2020 and 2021. The interview method made it possible to study the situation in detail as it has developed. Based on the generalization of qualitative data, the substantial characteristics of the informants’ value judgments are formed, strong and weak sides of the learning process related to introduction of new formats of interaction “university – teacher – student”. The ambivalent attitude of students to full-time and distance learning was revealed. The scientific novelty of the study lies in the data acquisition, systematization and analytical generalization of the original material on the transformation of students’ educational practices as a result of a forced mass transition to distance education. The obtained materials provide grounds for clarifying the process and results of these changes and can be used to justify management decisions

Interleukin-6 is a potential target for a correction of endothelial dysfunction associated with low-grade systemic inflammation

One of pathogenetic links of development of endothelial dysfunction, as an early marker of cardiovascular disease and comorbidity, is a low-grade systemic inflammation. In this regard, correction of cytokines imbalance is one of the possible ways of prevention and treatment of major chronic noninfectious diseases. To study the endothelium protective effects of anti-IL-6 receptor monoclonal antibodies tocilizumab in experimental preclinical studies in a model of endothelial dysfunction associated with the low-grade systemic inflammatio

Валідація алкаліметричної методики кількісного визначення вільних органічних кислот у листі малини

 Organic acids are a large group of biologically active compounds that perform important functions in the plant organism. Moreover, all plants, regardless of the species and family, contain organic acids to a small or large extent as organic acids belong to intermediate metabolites arising from the oxidation of proteins and amino acids, fats and carbohydrates.Aim. To validate the method of alkalimetry proposed with potentiometric detection of the end-point for the quantitative determination of free organic acids in raspberry leaves.Results and discussion. The method proposed was validated according to the International Conference on Harmonization (ICH) guidelines. The linearity was in the concentration range of 40 – 200 % (r2 = 0.9991). The percentage of recovery was found to be in the range of 98.77 – 102.48 %. The repeatability and intermediate precision were 1.58 % and 1.74 %, respectively. The method is accurate and reliable, with the relative standard deviation of less than 2 %.Experimental part. Leaves of raspberry were collected in the Kharkiv region during the period of full ripening. A Hanna 2550 pH-meter with a HI 1131P potentiometric electrode was used for alkalimetric titration of free organic acids. The titration was carried out using a microburette with Class A accuracy.Conclusions. The alkalimetry method for the quantitative determination of free organic acids in raspberry leaves has been proposed and validated according to the following parameters: specifcity, linearity, accuracy, repeatability, intermediate precision, robustness. It has been confrmed that the method is simple, reliable, accurate and cost-effective.Key words: raspberry; leaves; free organic acids; alkalimetry; validationОрганічні кислоти – велика група біологічно активних сполук, які виконують важливі функції в обміні речовин рослин. Усі рослини, незалежно від виду та родини, містять органічні кислоти в невеликій або значній кількості, бо ці речовини належать до проміжних метаболітів, що утворюються в результаті окиснення білків, амінокислот, жирів та вуглеводів.Мета. Валідувати запропоновану алкаліметричну методику з потенціометричним виявленням кінцевої точки титрування для кількісного визначення вільних органічних кислот у листі малини.Результати та їх обговорення. Запропонований метод валідовано згідно з директивою International Conference on Harmonization. Лінійність зберігалася в діапазоні концентрацій 40 – 200 % (r2= 0,9991). Визначено, що відсоток відновлення становить 98,77 – 102,48 %, повторюваність та проміжна точність – 1,58 % та 1,74 % відповідно. Метод характеризується як точний і надійний, має відносне стандартне відхилення менше 2 %.Експериментальна частина. Листя малини в період повного дозрівання збирали в Харківській області. Для алкаліметричного титрування вільних органічних кислот використовували рН-метр Hanna 2550 з потенціометричним електродом HI 1131P. Титрування проводили мікробюреткою з класом точності А.Висновки. Розроблену титриметричну методику кількісного визначення вільних органічних кислоту листі малини валідовано за такими параметрами: специфічність, лінійність, точність, збіжність, внутрішня прецизійність, робасність. Підтверджено, що метод є простим, надійним, точним та економічно вигідним.Ключові слова: малина; листя; вільні органічні кислоти; алкаліметрія; валідаці

A comparison of the two approaches of the theory of critical distances based on linear-elastic and elasto-plastic analyses

The problem of determining the strength of engineering structures, considering the effects of the non-local fracture in the area of stress concentrators is a great scientific and industrial interest. This work is aimed on modification of the classical theory of critical distance that is known as a method of failure prediction based on linear-elastic analysis in case of elasto-plastic material behaviour to improve the accuracy of estimation of lifetime of notched components. Accounting plasticity has been implemented with the use of the Simplified Johnson-Cook model. Mechanical tests were carried out using a 300 kN electromechanical testing machine Shimadzu AG-X Plus. The cylindrical un-notched specimens and specimens with stress concentrators of titanium alloy Grade2 were tested under tensile loading with different grippers travel speed, which ensured several orders of strain rate. The results of elasto-plastic analyses of stress distributions near a wide variety of notches are presented. The results showed that the use of the modification of the TCD based on elasto-plastic analysis gives us estimates falling within an error interval of ±5-10%, that more accurate predictions than the linear elastic TCD solution. The use of an improved description of the stress-strain state at the notch tip allows introducing the critical distances as a material parameter

Immunological features of allergic rhinitis in combination with chronic rhinosinusitis of bacterial etiology

Rhinitis is a socially significant and widespread disease. Often, various forms of rhinitis are combined, and thus cause severe clinical manifestations, insufficient effectiveness of drug treatment, as well as difficulties in differential diagnosis. It is known that a significant number of patients have a combination of allergic rhinitis (AR) with chronic rhinosinusitis of bacterial etiology. This condition is based on a chronic multifactorial inflammatory process of the nasal mucosa, which determines the steady progression of the disease. Of interest is the study of a number of allergo-immunological parameters in nasal secretions in order to assess local inflammation and changes in mucosal immunity in allergic rhinitis in combination with chronic rhinosinusitis of bacterial etiology (AR with HRSBE). Mucosal immunity and biological mediators determine local inflammation and pathophysiological response to etiological factors in the immunopathogenesis of AR with CRSBE. The work carried out the determination of the level of cytokines: IL-4, IL-10, TGF-â1, IFNã spontaneous and induced; immunoglobulins: IgA, IgM, IgG, sIgA in nasal secretions; leukotrienes: LT C4/ D4/E4 and LTB4 in plasma and total IgE in serum in patients with AR with moderate-severity HRSBE without exacerbation. It has been shown that the leading role in the formation of the inflammatory process in AR with CRSBE belongs to cytokines: IL-4, IL-10, TGF-â; immunoglobulins: IgM, sIgA; leukotrienes: LT C4/D4/E4 and LTB4 and total IgE. Induced cytokine production largely reflects the reserve capabilities of immunocompetent cells in response to the action of a pathogenic factor. The results obtained are associated with the persistent course of allergic and infectious inflammation and the progression of the disease. Thus, cytokines: IL-4, IL-10, TGF-â1; immunoglobulins: IgM, sIgA, IgE total and LT C4/D4/E4 and LTB4 make a significant contribution to pathogenetic mechanisms, determining the clinical course of AR with CRSBE, and can serve as biological markers of the activity of the pathological process. Undoubtedly, the immune mechanisms in the combined pathological inflammatory reaction from the mucosa in AR with HRSBE are complex and multifaceted. A personalized approach to the treatment of patients with AR with CRSBE is determined by the severity and intensity of the inflammatory reaction, as well as mucosal mucosal immunity disorders. The study of the role and significance of the production of leading cytokines, immunoglobulins in nasal secretions, as well as leukotrienes and total IgE in the blood will help the doctor in determining the tactics and duration of pharmacotherapy

Radiobiological experiments with plant seeds aboard the biosatellite Cosmos 1887

The effects of spaceflight factors on the seeds of Arabidopsis thaliana and Crepis capillaris were studied. The seeds were located inside the satellite in an open space, protected with aluminum foil and also exposed without the foil cover. When the seeds were in open space without any protection, their viability was found to be suppressed; the survival rate and fertility of plants grown from these seeds were also diminished. An increase in the frequency of chromosome aberrations (CA) and in the number of multiple injuries was registered in this case. Experiments with the aluminum foil shielding showed a decrease in the suppression of the seeds' viability, but mutational changes were found to be even more increased, while the survival rate and fertility of the plants decreased. An increase in the thickness of shielding resulted in a decrease in the effects up to the level of the control, except for the effects connected with CA and fertility of the plants. Analysis of the results shows that these impairments can be ascribed to the action of single heavy charged particles (HCP). The seeds can thus be regarded as an integral biological 'dosimeter' which allows estimation of the total effects of radiation, ecological and biological factors