NCT02137187 (May 2018, date last accessed).

The results of the study of the efficiency of heat treatment of samples of glauconite are presented. Estimated ability of the sorbent to water absorption and retention of petroleum products. It was established by the method of differential scanning calorimetry that thermally activated glauconite samples are practically not saturated with water vapor. Oil capacity decreases after heat treatment of glauconite at 600°C and increases at 1000°C compared with the original sample, which is explained by various structural changes.

In the electroplating industry, large volumes of water are used, which are polluted at various stages in the process. Waste water containing transition metal ions is not only a dangerous source of environmental pollution, but also valuable waste. Taking into account the problems associated with the ecology and the rational use of natural resources, it is necessary to create low- and non-waste production, in particular, to develop new technological processes and appropriate equipment, to introduce water-circulation cycles. This paper presents the results of a study of the sorption of copper (II) and nickel (II) cations by the FIBAN X-1 ion exchange fiber. Calorimetric studies of the thermal effects of the interaction of FIBAN X-1 fiber with solutions of copper (II) and nickel (II) nitrates were carried out. It is shown that the power, thermal effect and time of the process depend on the nature and concentration of metal ions in the solution. Based on the experimental data, the enthalpy of the process was calculated. The endothermic effect of the process is explained by the energy costs associated with dehydration effects and changes in the conformation of the polymer fiber chains. Sorption isotherms of these ions were obtained. It has been established that at all concentrations studied, Ni2 + ions under these conditions are absorbed by ion exchange fibers better than Cu2 + cations. The calculated sorption constants for copper (II) and nickel (II) are greater than 1. It is shown that the Langmuir equation describes the sorption isotherm better than the Freundlich equation. For deep purification of waste water from metal ions, it was proposed to use the fibrous sorbent FIBAN X-1.

<p>Access to the left atrium during transseptal puncture for radiofrequency ablation in patients with atrial fibrillation (AF) and implanted atrial septal occluder can be challenging. This is particularly true when the occluder covers the entire septum and there is no ideal puncture site. This might lead to potential difficulties in arrhythmia treatment.<br />A 59-year-old patient with drug refractory AF, a dilated left atrium, and an implanted atrial septal occluder underwent double transseptal puncture through atrial septal occluder with subsequent pulmonary vein isolation using remote magnetic navigation. The effectiveness of the manipulation was confirmed by intraoperative stimulation from the Lasso catheter and by Holter monitoring data post-operation. It was revealed that the patient had sinus rhythm and no complications occurred. There were no shunts at the occluder level on transthoracic echocardiography, and there were no atrial tachyarrhythmias during the nine-month follow up period without antiarrhythmic drugs. The presented clinical case demonstrates the safety and efficacy of transseptal puncture through an implanted occluder in the interatrial septum to perform re-ablation using robotic magnetic navigation in a patient with AF.</p><p>Received 21 October 2020. Revised 20 November 2020. Accepted 25 November 2020.</p><p><strong>Funding:</strong> The work is supported by a grant of the President of the Russian Federation No. МД-1997.2020.7.</p><p><strong>Conflict of interest:</strong> Authors declare no conflict of interest.</p><p><strong>Author contributions</strong> <br />Drafting the article: А.V. Ponomarenko, R.E. Zhizhov, V.V. Baranova, E.V. Fisher, A.B. Romanov<br />Literature review: А.V. Ponomarenko, R.E. Zhizhov, V.V. Baranova, E.V. Fisher<br />Illustrations: А.V. Ponomarenko, A.B. Romanov<br />Critical revision of the article: А.V. Ponomarenko, R.E. Zhizhov, V.V. Baranova, A.M. Chernyavskiy, A.B. Romanov<br />Surgical treatment: N.А. Yelemessov, I.S. Peregudov, V.V. Shabanov, A.B. Romanov<br />Final approval of the version to be published: А.V. Ponomarenko, N.А. Yelemessov, I.S. Peregudov, R.E. Zhizhov, V.V. Baranova, E.V. Fisher, V.V. Shabanov, A.M. Chernyavskiy, A.B. Romanov</p>