CFD simulations have been used to determine mass transfer coefficients and power consumption of commercial net spacers. The simulations show transversal and longitudinal vortices, vortex shedding and instationary flow behavior leading to the enhanced mass transfer in spacer filled-channels compared to empty channels. The results of the simulations were validated with experiments and compared wi...

Two multicomponent models for spiral-wound gas permeators are proposed. The basic transport model is derived from fundamental material balances and permeation relations that account for permeate-side pressure variations. The resulting model consists of a set of nonlinear differential-algebraic-integral equations with mixed boundary conditions, as well as an implicit expression for the local fee...

Polysphondylium violaceum and Dictyostelium discoideum myxamoebae have simple double-layered nuclear membranes, a cytoplasmic reticulum of particle-covered membranes, and small mitochondria consisting of convoluted tubules tightly packed in double membranes. In addition to objects still recognisable as bacteria, their food vacuoles contain concentric (or spiral) membranes, apparently formed sec...

BACKGROUND The purpose of this study was to develop novel sandwich-structured nanofibrous membranes to provide sustained-release delivery of vancomycin, gentamicin, and lidocaine for repair of infected wounds. METHODS To prepare the biodegradable membranes, poly(D, L)-lactide-co-glycolide (PLGA), collagen, and various pharmaceuticals, including vancomycin, gentamicin, and lidocaine, were firs...

PURPOSE Plasma Membrane Calcium-ATPases (PMCAs) are integral membrane proteins essential to the control of intracellular Ca2+ concentration. In humans, four genes encode PMCA proteins termed PMCA1-PMCA4. PMCA4 is the major PMCA isoform expressed in human corneal epithelium (hCE); however, little is known about its role. The present study documented expression of PMCA4 in rabbit CE (rbCE) and fo...

We present a new method for estimating the corotation radius in tightly wound spiral galaxies, through analysis of the radial variation of the offset between arms traced by the potential (P-arms) and those traced by dust (D-arms). We have verified the predictions of semi-analytical theory through hydrodynamical simulations and have examined the uniqueness of the galactic parameters that can be ...

Collagen XVII (ColXVII, also known as BP180, BPAg2) is a constituent of hemidesmosomes that bind epidermis to underlying layers the skin. It type II transmembrane protein with 15 extracellular collagenous domains. Juxtamembraneous non-collagenous 16th A domain (NC16A) in human ColXVII target for cleavage proteases shed from cell surface during keratinocyte migration and differentiation. The imp...

In dental implantology, the guided bone regeneration (GBR) membrane plays an active role in increasing alveolar volume. However, there are some drawbacks to current commercial membranes, such as non-degradability for non-absorbable membranes and low mechanical strength absorbable membranes. Recently, magnesium (Mg) alloys have been proposed potential barrier candidates. As a result, purpose of ...

The placenta is the fastest growing organ of the human body. The placenta grows from a single cell to approximately 5x10 cells in 38 weeks. A good blood supply from maternal blood via the spiral arteries to the placenta is not only very important for the foetus but also very important for normal development of the placenta. The maternal blood is supplied to the placenta by spiral arteries. Appr...