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We present the case of a 46-year-old patient who arrived at the emergency department with chest pain following an episode of vomiting. The diagnosis was Boerhaave syndrome and acute mediastinitis. Due to the prompt presentation and the location of the rupture in the lower esophagus, emergency surgical intervention was performed, including esophageal suturing, mediastinal drainage, and jejunostomy for feeding. Postoperatively, the patient was transferred to the intensive care unit for advanced monitoring and support. The patient’s condition improved favorably in the intensive care unit, allowing for extubation. Progress continued positively, and the patient was discharged 12 days postoperatively with a functional jejunostomy. At regular follow-ups, the patient’s recovery remained favorable, and the jejunostomy was removed 30 days after the surgery. This case highlights the importance of rapid diagnosis and early surgical intervention in Boerhaave syndrome, demonstrating the successful management of a severe condition through a multidisciplinary effort.

The paper’s aim is the assessment of corrosion behaviour of a CrNx-coated 310 H stainless steel under simulated supercritical water conditions (550 °C and 25 MPa) for up to 2160 h. The CrNx coating was obtained by the thermionic vacuum arc (TVA) method. The oxides grown on this coating were characterized using metallographic and gravimetric analysis, SEM with EDS, and grazing incidence X-ray diffraction (GIXRD). A diffusion mechanism drives oxidation kinetics because it follows a parabolic law. By XRD analysis, the presence of Cr2O3 and Fe3O4 on the surface of the autoclaved CrNx-coated 310 H samples were highlighted. Corrosion susceptibility assessment was performed by electrochemical impedance spectroscopy (EIS) and linear potentiodynamic polarization. EIS impedance spectra show the presence of two capacitive semicircles in the Nyquist diagram, highlighting both the presence of the CrNx coating and the oxide film formed during autoclaving on the 310 H stainless steel. Very low corrosion rates, with values up to 11 nm × year−1, obtained in the case of autoclaved for 2160 h, CrNx-coated samples indicated that the oxides formed on these samples are protective and provide better corrosion resistance. The determination of micro hardness Vickers completed the above investigation.

Biorhythm or circadian rhythm represents a biological process through which the human body adopts a rhythmicity, which can be measured once every 24 hours. An analytical analysis of human biorhythms and their interaction in the synergy of psychomotor capabilities of lawn tennis players was performed. The reliability of performances in official competitions is conditioned by the integral preparation of the athlete, the components of which are optimal technical and tactical, physical, functional and mental training, taking into account the manifestation of his biorhythms. Biorhythmology is currently of great theoretical and practical importance in sports training. However, certain principles and provisions of biorhythmology in sports are insufficiently highlighted and scientifically justified, but, without a doubt, research in this direction gives the expected practical result. A series of aspects of psychophysiology are highlighted, the solution of which largely depends on the success of using biorhythms to increase the efficiency of sports activities. The dynamics of the circadian rhythms of the psychophysiological functions are reflected in the volume and intensity of the applied training and competition tasks, as well as in the physical recovery after their performance. In order to identify the relationship between biorhythms and sports and psychomotor performances of athletes, we analyzed the results obtained in competitions by tennis students (the best and worst of the season). The analysis of the obtained results showed that the best sports and test results are presented by tennis players during the optimal phases of the biorhythm, and the worst - during critical periods. It is necessary to take into account the characteristics of the biorhythm when predicting and analyzing the performances of athletes in certain competitions and the test parameters that characterize their psychomotor capabilities as determining factors of sports and tactical abilities. It has been established that psychomotor indices and sports performance of tennis players are interconnected with the periods of biorhythms. In the negative period and on the critical days, the greatest decrease in the reactions to the moving object (RMO) was observed, the decrease in the state-impact force, which provides the force of the deep (postural) muscles of the trunk, involved in maintaining both statodynamic and dynamic, one of the factors of motorcoordinating qualities of tennis players. [ABSTRACT FROM AUTHOR]

One of the most important problems of modern science is the search for new reserves aimed at increasing the efficiency of educational, work and training activities by using biological rhythms. The temporal sequence of interaction of various functional systems of the body with the environment, developed in the course of evolution, contributes to the harmonious coordination of various biological processes and ensures the normal functioning of the entire organism. This reveals the important adaptive value of biorhythms for the body's vital functions. However, certain principles and provisions of biorhythms in sports are insufficiently highlighted and scientifically justified, but without a doubt, scientific research in this direction brings the expected practical result. We also mention the problems of psychophysiology, the solution of which largely depends on the success of using biorhythms to improve the efficiency of sports and students learning activities [1]. The dynamics of the circadian rhythmicity of the psychophysiological functions is reflected in the volume and intensity of the applied training and competition tasks, as well as in the performance recovery after performing them. Three biorhythms are known that significantly influence human performance: physical, emotional and intellectual ones. [ABSTRACT FROM AUTHOR]