ВЛИЯНИЕ ЦЕЛЕНАПРАВЛЕННОЙ ТЕРАПИИ РАЗЛИЧНЫМИ ВИДАМИ РАСТВОРОВ НА ФУНКЦИЮ ПОЧЕК У КАРДИОХИРУРГИЧЕСКИХ ПАЦИЕНТОВ

The article describes the impact of the targeted therapy with colloid and crystalloid infusion solutions on renal function and fluid balance during the surgery and early post-surgery period in the patients who underwent aortocoronary bypass under cardio-pulmonary bypass. No differences have been found in the frequency of acute renal lesion as per AKI and the need in the substitution renal therapy. During one stage of the study the lower rates of urine neutrophil gelatinase-associated lipocalin have been observed in the group of crystalloids. The lack of confident differences in the clinical course of the post-surgery period makes the use of the balanced crystalloid solution more preferable compared to colloid solutions. В статье рассмотрено влияние целенаправленной терапии коллоидными и кристаллоиднымии инфузионными растворами на функцию почек и на баланс жидкости во время операции и в раннем послеоперационном периоде у пациентов, которым выполнено аортокоронарное шунтирование в условиях искусственного кровообращения. Не выявлено различий в частоте острого почечного повреждения по AKI и потребности в заместительной почечной терапии. На одном из этапов исследования зафиксированы более низкие показатели нейтрофильного желатиназа-ассоциированного липокалина мочи в группе кристаллоидов. Отсутствие достоверных различий в клиническом течении послеоперационного периода делает применение сбалансированного кристаллоидного раствора предпочтительнее, чем коллоидных растворов

Reactive Pulsed Laser Deposition of Clustered-Type MoSx (x ~ 2, 3, and 4) Films and Their Solid Lubricant Properties at Low Temperature

We studied the tribological properties of amorphous molybdenum sulfide (MoSx) thin-film coatings during sliding friction in an oxidizing environment at a low temperature (−100 °C). To obtain films with different sulfur contents (x ~ 2, 3, and 4), we used reactive pulsed laser deposition, where laser ablation of the Mo target was performed in H2S at various pressures. The lowest coefficient of friction (0.08) was observed during tribo-testing of the MoS3 coating. This coating had good ductility and low wear; the wear of a steel counterbody was minimal. The MoS2 coating had the best wear resistance, due to the tribo-film adhering well to the coating in the wear track. Tribo-modification of the MoS2 coating, however, caused a higher coefficient of friction (0.16) and the most intensive wear of the counterbody. The MoS4 coating had inferior tribological properties. This study explored the mechanisms of possible tribo-chemical changes and structural rearrangements in MoSx coatings upon contact with a counterbody when exposed to oxygen and water. The properties of the tribo-film and the efficiency of its transfer onto the coating and/or the counterbody largely depended on local atomic packing of the nanoclusters that formed the structure of the amorphous MoSx films

Tribological Properties of WS2 Thin Films Containing Graphite-like Carbon and Ni Interlayers

The development and production of thin-film coatings having very low friction is an urgent problem of materials science. One of the most promising solutions is the fabrication of special nanocomposites containing transition-metal dichalcogenides and various carbon-based nanophases. This study aims to explore the influence of graphite-like carbon (g-C) and Ni interface layers on the tribological properties of thin WS2 films. Nanocrystalline WS2 films were created by reactive pulsed laser deposition (PLD) in H2S at 500 °C. Between the two WS2 nanolayers, g-C and Ni nanofilms were fabricated by PLD at 700 and 22 °C, respectively. Tribotesting was carried out in a nitrogen-enriched atmosphere by the reciprocal sliding of a steel counterbody under a relatively low load of 1 N. For single-layer WS2 films, the friction coefficient was ~0.04. The application of g-C films did not noticeably improve the tribological properties of WS2-based films. However, the application of thin films of g-C and Ni reduced the friction coefficient to 0.013, thus, approaching superlubricity. The island morphology of the Ni nanofilm ensured WS2 retention and altered the contact area between the counterbody and the film surface. The catalytic properties of nickel facilitated the introduction of S and H atoms into g-C. The sliding of WS2 nanoplates against an amorphous g-C(S, H) nanolayer caused a lower coefficient of friction than the relative sliding of WS2 nanoplates. The detected behavior of the prepared thin films suggests a new strategy of designing antifriction coatings for practical applications and highlights the ample opportunities of laser techniques in the formation of promising thin-film coatings

IMPACT ОF TARGETED THERAPY WITH VARIOUS TYPES ОF SOLUTIONS ON RENAL FUNCTIONS IN THE PATIENTS UNDERGOING CARDIAC SURGERY

The article describes the impact of the targeted therapy with colloid and crystalloid infusion solutions on renal function and fluid balance during the surgery and early post-surgery period in the patients who underwent aortocoronary bypass under cardio-pulmonary bypass. No differences have been found in the frequency of acute renal lesion as per AKI and the need in the substitution renal therapy. During one stage of the study the lower rates of urine neutrophil gelatinase-associated lipocalin have been observed in the group of crystalloids. The lack of confident differences in the clinical course of the post-surgery period makes the use of the balanced crystalloid solution more preferable compared to colloid solutions