Objective A unique feature of embryo metabolism is production of reactive oxygen species (ROS). It is well established that during in vitro culture, ROS levels increase over normal ranges observed for embryos developed in vivo. This study evaluates and compares the stepwise pattern of ROS production during in vitro development of reconstructed goat embryos produced by zona-free method of somati...

The bacterial flagellar motor is driven by the electrochemical potential of specific ions, H(+) or Na(+). The motor consists of a rotor and stator, and their interaction generates rotation. The stator, which is composed of PomA and PomB in the Na(+) motor of Vibrio alginolyticus, is thought to be a torque generator converting the energy of ion flux into mechanical power. We found that specific ...

This paper deals with the design and performance analysis of double stator axial flux permanent magnet generators for rim-driven marine current turbines (MCT). Indeed for submarine applications, drive train reliability is a key feature to reduce maintenance requirements. Rim-driven direct-drive multi-stator generators can therefore be a very interesting solution to improve this reliability. In ...

PomA and PomB are transmembrane proteins that form the stator complex in the sodium-driven flagellar motor of Vibrio alginolyticus and are believed to surround the rotor part of the flagellar motor. We constructed and observed green fluorescent protein (GFP) fusions of the stator proteins PomA and PomB in living cells to clarify how stator proteins are assembled and installed into the flagellar...

air spindles are one of the main elements of precise machine tools. vibration of these spindles is one of the vital issues necessary for investigation. among parameters which influence air spindle vibrations are rotational speed, compression air method, input nozzle diameter, air gap pressure. in this study using ansys, the effects of air gap thickness on air spindle vibrations have been invest...

The first objective of this research is to present an improved Direct Torque Control based on the Space Vector Modulation (DTC-SVM) and a Sliding Mode Observer (SMO). The disadvantages of the conventional Direct Torque Control (DTC) are the high ripples for the electromagnetic torque and the stator flux, as well as the distortions of the stator current. To solve these problems, we have used the...

The S1 stream surface inverse method for a single-stage axial transonic compressor was developed and studied under the guidance of quasi-three-dimensional viscous design theory, based on computational fluid dynamics (CFD), in order to establish solve governing equations. re--adjusted load distribution imposed obtain special profile rotor, which is known as S-shaping. This changed structure weak...

This manuscript presents the application of a recently developed noise reduction technology, constituted by poro-serrated stator blades on full-scale aircraft model, in order to reduce rotor-stator interaction fan stage. study was carried out using commercial lattice Boltzmann solver 3DS-SIMULIA PowerFLOW. The simulation combines airframe NASA High-Lift Common Research Model with an upscaled st...

Vacuolar ATPases (V-ATPases) are molecular machines responsible for creating electrochemical gradients and preserving pH-dependent cellular compartments by way of proton translocation across the membrane. V-ATPases employ a dynamic rotary mechanism that is driven by ATP hydrolysis and the central rotor stalk. Regulation of this rotational catalysis is the result of a reversible V(1)V(o)-domain ...