MoVN-Cu Coatings for In Situ Tribocatalytic Formation of Carbon-Rich Tribofilms in Low-Viscosity Fuels.

Inhibiting the tribological failure of mechanical assemblies which rely on fuels for lubrication is an obstacle to maintaining the lifetime of these systems with low-viscosity and low-lubricity fuels. In the present study, a MoVN-Cu nanocomposite coating was tribologically evaluated for durability in high- and low-viscosity fuels as a function of temperature, load, and sliding velocity conditions. The results indicate that the MoVN-Cu coating is effective in decreasing wear and friction relative to an uncoated steel surface.

[Transcatheter aortic valve replacement after Ozaki procedure].

The Ozaki operation is currently considered to be a sufficiently known surgical procedure performed in aortic valve defects. Despite satisfactory results in the mid-term period after neocuspidalization, there have been reported cases of pronounced aortic insufficiency due to rupture of neocusps or their endocarditis. Transcatheter aortic valve replacement is a rapidly developing trend at the junction of modern cardiac surgery and interventional cardiology, expansively covering groups of patients at high, moderate and recently also low surgical risk.

Open transaortic implantation of 'Medlab-KT' prosthesis.

Aim: The study was aimed at comparing the immediate clinical and haemodynamic results of open implantation of the balloon-expandable aortic prosthesis 'MedLab-KT' with the respective parameters of standard replacement of the aortic valve by a mechanical prosthesis in high-risk surgical patients.

Patients And Methods: We analysed a total of 209 cases of prosthetic repair of the aortic valve. The Study Group comprised 28 patients subjected to open implantation of the 'MedLab-KT' prosthesis in conditions of extracorporeal circulation and myocardial ischaemia and belonging to a high-surgical risk cohort.

[First serial transcatheter implantation of pulmonary valve using MedLab-KT prosthesis].

Background: Surgical treatment of 'blue' congenital heart defects frequently implies various interventions on the outlet portion of the right ventricle or pulmonary artery trunk. Most often used are various conduits, reconstructing the outlet portion of the right ventricle and pulmonary artery. Most patients having previously endured the mentioned interventions, would in the remote terms require repeat operative procedures for stenosis or insufficiency on the pulmonary valve or the implanted conduit.

Cyclopropenylidenes as Strong Carbene Anchoring Groups on Au Surfaces.

The creation of stable molecular monolayers on metallic surfaces is a fundamental challenge of surface chemistry. N-Heterocyclic carbenes (NHCs) were recently shown to form self-assembled monolayers that are significantly more stable than the traditional thiols on Au system. Here we theoretically and experimentally demonstrate that the smallest cyclic carbene, cyclopropenylidene, binds even more strongly than NHCs to Au surfaces without altering the surface structure.