Possibility of therapy of acute ischemic stroke by polyphenols of flavonoid group

Objective - to study neuroprotective effect of Quercetin in ischemia-reperfusion injury in acute ischemic stroke. Materials and methods. The study included 98 patients with acute ischemic stroke. All patients: main and control group, received standard treatment in accordance with the clinical protocol order Ministry of Health of Ukraine from 03.08.2012, № 602. Patients of the main group (n=68) on the back of the base further treatment was administered quercetin (Corvitin lyophilisate injection solution) course of 10 days according to the scheme: 500 mg of the drug diluted in 100 ml of 0.9% of the physiological solution intravenously twice a day for the first five days and once a day for the next five days. Patients in the control group (n=30) - quercetin is not appointed. Assessment by GCS, NIHSS, Barthel served in the 1st, 3rd, 5th, 10th day of the disease. Results. Simultaneously with the standard treatment, intravenous administration of quercetin, positively influenced the regression of focal neurological symptoms on the NIHSS and Barthel scales in patients with acute ischemic stroke, increased the proportion of patients in the consciousness or with its minor impairments in the GCS, ie contributed to an earlier “awakening” in acute ischemic stroke. Conclusions. Neuroprotective effect of quercetin (Corvitin lyophilisate injection solution) can be explained by its polytropic, antioxidant, anti-inflammatory, membrane-stabilizing effect in ischemia-reperfusion

Scaling properties of step bunches induced by sublimation and related mechanisms: A unified perspective

This work provides a ground for a quantitative interpretation of experiments on step bunching during sublimation of crystals with a pronounced Ehrlich-Schwoebel (ES) barrier in the regime of weak desorption. A strong step bunching instability takes place when the kinetic length is larger than the average distance between the steps on the vicinal surface. In the opposite limit the instability is weak and step bunching can occur only when the magnitude of step-step repulsion is small. The central result are power law relations of the between the width, the height, and the minimum interstep distance of a bunch. These relations are obtained from a continuum evolution equation for the surface profile, which is derived from the discrete step dynamical equations for. The analysis of the continuum equation reveals the existence of two types of stationary bunch profiles with different scaling properties. Through a mathematical equivalence on the level of the discrete step equations as well as on the continuum level, our results carry over to the problems of step bunching induced by growth with a strong inverse ES effect, and by electromigration in the attachment/detachment limited regime. Thus our work provides support for the existence of universality classes of step bunching instabilities [A. Pimpinelli et al., Phys. Rev. Lett. 88, 206103 (2002)], but some aspects of the universality scenario need to be revised.Comment: 21 pages, 8 figure

Frontal cortex functional activity modulation impact on the stereotypic, emotional and postural behavior in rats during the interictal period of pilocarpine-induced chronic epileptogenesis

The cholinergic mechanisms role determination in epileptogenesis attracts the attention of researchers. Pilocarpine administration in rats contributes to chronic form of epileptiform activity development characterized by the presence of a pronounced acute stage and an interictal period - free from behavioral convulsive reactions. We consider the most important feature of the pilocarpine-induced seizures interictal period might be the change of various forms of nonconvulsive behavior. Attempts to investigate the animals’ behavioral reactions details during the seizure-free interictal period, as well as to determine the mechanisms of similar types of behavior formation, are interesting. The purpose of the work is to investigate the motor, stereotypic and aggressive-defensive behavior of rats throughout the interictal period of pilocarpine-induced convulsive syndrome with a frontal cortex functional activity change. It was found that the severity of non-convulsive behavioral reactions in the interictal period during pilocarpine-induced chronic seizures is mostly determined by the frontal cortex functional state. At the same time, the frontal cortex hyperactivation is an important feature of pilocarpine-induced chronic epileptogenesis.  The authors proved that when the frontal cortex is activated in rats, there is an increase in horizontal and vertical motor activity, as well as the expressiveness of emotional reactions in the “open field” test and the strengthening of the aggressive-defensive behavior. In conditions of this part of the cortex selective destruction the opposite behavioral effects are noted which confirms the important role of the frontal cortex in the interictal non-convulsive behavior formation. Observed behavioral effects during the frontal cortex functional activity modulation, according to the authors, indicate the reasonability of regulatory influences searching aiming forward this brain part to activate complex mechanisms aimed to pilocarpine-induced chronic epileptiform activity elimination

Brain Hemodynamics and Cerebrovascular Reactivity in Patients with Tension-Type Headache

Tension-type headache (TTH) is very common, with a lifetime prevalence in the general population ranging in different studies between 30% and 78%. TTH, divided into episodic and chronic types, introduced in the manual "International Classification of Headache Disorders"(ICHD-I), is of practical importance. Infrequent episodic headaches (no more than once a month) may not require drug therapy, but, on the contrary, frequent forms may require expensive treatment

Step Bunching with Alternation of Structural Parameters

By taking account of the alternation of structural parameters, we study bunching of impermeable steps induced by drift of adatoms on a vicinal face of Si(001). With the alternation of diffusion coefficient, the step bunching occurs irrespective of the direction of the drift if the step distance is large. Like the bunching of permeable steps, the type of large terraces is determined by the drift direction. With step-down drift, step bunches grows faster than those with step-up drift. The ratio of the growth rates is larger than the ratio of the diffusion coefficients. Evaporation of adatoms, which does not cause the step bunching, decreases the difference. If only the alternation of kinetic coefficient is taken into account, the step bunching occurs with step-down drift. In an early stage, the initial fluctuation of the step distance determines the type of large terraces, but in a late stage, the type of large terraces is opposite to the case of alternating diffusion coefficient.Comment: 8pages, 16 figure

Integration of theoretical and clinical disciplines teaching as one of factors of medical knowledge efficacy

The article discusses the problem of medical students theoretical knowledge improvement that will significantly improve their clinical knowledge. The main factors that determine medical students’ positive motivation to study are considered. The authors prove that both theoretical and clinical disciplines teaching integration is possible as a result of complex approach to students teaching that will result in students’ knowledge survival on the higher courses. Leading role belongs to the theoretical departments which workers by writing textbooks and manuals, creating teaching multimedia programmes, using exact control and students' knowledge evaluation will provide the necessary motivational component of students’ further teaching on clinical departments. The integrated approach contributes to future profession single picture formation, motivates students to theoretical and clinical disciplines deep study. The future doctors teaching process reforming at Odessa National Medical University General and Clinical Pathological Physiology Department is given as an example.Authors guesses that new methodical methods of working with students in the practical work introduction, the change in the technology of teaching, the modification of the educational process, the approximation of theoretical knowledge to the patient's bed, the greater students interest in the positive end-goal - a correct diagnosis and cure of the patient - will allow to optimize the educational process and improve the quality of students’ training

Возможности терапии острого ишемического инсульта полифенолами флавоноидной группы

Objective - to study neuroprotective effect of Quercetin in ischemia-reperfusion injury in acute ischemic stroke. Materials and methods. The study included 98 patients with acute ischemic stroke. All patients: main and control group, received standard treatment in accordance with the clinical protocol order Ministry of Health of Ukraine from 03.08.2012, № 602. Patients of the main group (n=68) on the back of the base further treatment was administered quercetin (Corvitin lyophilisate injection solution) course of 10 days according to the scheme: 500 mg of the drug diluted in 100 ml of 0.9% of the physiological solution intravenously twice a day for the first five days and once a day for the next five days. Patients in the control group (n=30) - quercetin is not appointed. Assessment by GCS, NIHSS, Barthel served in the 1st, 3rd, 5th, 10th day of the disease. Results. Simultaneously with the standard treatment, intravenous administration of quercetin, positively influenced the regression of focal neurological symptoms on the NIHSS and Barthel scales in patients with acute ischemic stroke, increased the proportion of patients in the consciousness or with its minor impairments in the GCS, ie contributed to an earlier “awakening” in acute ischemic stroke. Conclusions. Neuroprotective effect of quercetin (Corvitin lyophilisate injection solution) can be explained by its polytropic, antioxidant, anti-inflammatory,Цель - изучить нейропротекторное действие кверцетина при ишемическиреперфузионном повреждении в остром периоде ишемического инсульта. Материалы и методы. В исследование были включены 98 пациентов с острым ишемическим инсультом. Все пациенты: основная и контрольная группа, получавшие стандартное лечение в соответствии с клиническим протоколом приказа Минздрава Украины от 03.08.2012 г. № 602. Пациентам основной группы (n = 68) назначали кверцетин в дозе 500 мг, разведенный в 100 мл 0,9% физиологического раствора внутривенно капельно два раза в день в течение первых пяти дней и один раз в день в течение следующих пяти дней. Пациентам контрольной группы (n = 30) - кверцетин не назначается. Оценка по ШКГ, NIHSS, Barthel служила в 1-й, 3-й, 5-й, 10-й день заболевания. Результаты. Одновременно со стандартным лечением, внутривенное введение кверцетина, положительно влияло на регрессию очаговых неврологических симптомов по шкалам NIHSS и Barthel у пациентов с острым ишемическим инсультом, увеличивало долю пациентов в сознании или с его незначительными нарушениями по ШКГ, т.е. способствовало более раннему «пробуждению» при остром ишемическом инсульте. Выводы. Нейропротективный эффект кверцетина (раствор для инъекций лиофилизата корвитина) можно объяснить его политропным, антиоксидантным, противовоспалительным, мембраностабилизирующим действием при ишемииреперфузии

Effect of a primary aromatic amine on the chemical structure of polyethylene coatings

Changes in the chemical structure of polyethylene due to its modification with 4,4′-diamino-3,3′dichlorodiphenylmethane were studied by IR spectroscopy. © 1998 MAHK Hayka/Interperiodica Publishing

To the problems of modeling the brain ischemia in small animals

In the review article the problems of modeling cerebral ischemia in small mammals are consecrated. The advantages of experimental studies that are based on the similarity of the blood circulation of the brain in humans and animals are indicated. Classification of experimental models for the study of acute and chronic disorders of cerebral circulation, mechanisms of their development and preclinical approbation of new drugs is given. The authors indicate that all experimental models of brain ischemia can be divided into two groups: to study risk factors and pathophysiological studies of brain ischemia. And in the second case, the models of focal and global ischemia are described. In conclusion, the authors point out the difficulties and shortcomings of certain methods of ischemia reproduction, which await researchers to solve the above problems

Synthesis of Cardanol-Containing Resols for Producing Phenolic Films: Protective Coatings for Wood Composites

Abstract: This paper investigates synthesis of impregnating phenol–formaldehyde resins in which up to 30 wt % formulation phenol is replaced by cardanol, a plant product. The resulting resins were used to make impregnated paper for laminating the plywood and particle boards. The synthesis and structure of cardanol-containing water-soluble resols were studied by IR spectroscopy and 1H NMR, and the reactivity of phenol cardanol formaldehyde resins at 80–150°C was studied by differential scanning calorimetry. The optimal amount of cardanol in relation to phenol in the resin structure was determined. It is shown that the introduction of cardanol into the composition of phenol–formaldehyde resins reduces the impregnation time of kraft paper and improves the surface quality and elasticity of the impregnated paper, with the use of such paper making it possible to decrease the water absorption of laminated particle board materials and the emission of formaldehyde. © 2021, Pleiades Publishing, Ltd