In this study, by using X-ray powder diffraction profiles as blueprints, we successfully mapped the most probable molecular-level structural arrangement of the PMMA super-helix stereocomplexes through molecular dynamic simulations. Molecular-level resolution of the PMMA triple-helix supramolecule was not previously achievable by experimental methods. After constructing molecular models of stere...

We have studied the secondary structure of native phospholamban (PLB), a 52-residue integral membrane protein that regulates calcium uptake into the cardiac sarcoplasmic reticulum, as well as its 27-residue carboxy-terminal transmembrane segment (PLB26-52). The relative contents of alpha-helix, beta-strand, and random coil, as well as the spatial orientations of the alpha-helices of these molec...

From the view of differential geometry, a straight line is a geometric curve with the curvature κ(s) = 0. A plane curve is a family of geometric curves with torsion τ(s) = 0. Helix is a geometric curve with non-vanishing constant curvature κ and non-vanishing constant torsion τ [4]. The helix may be called a circular helix or W -curve [9]. It is known that straight line (κ(s) = 0) and circle (κ...

The aim of this study was to investigate the influence of fiber orientation in the left ventricular (LV) wall on the ejection fraction, efficiency, and heterogeneity of the distributions of developed fiber stress, strain and ATP consumption. A finite element model of LV mechanics was used with active properties of the cardiac muscle described by the Huxley-type cross-bridge model. The computed ...

The energy crisis has forced researchers to look for various non-conventional sources. Wind is one of the potential sources, and have invested resources in developing different kinds wind turbines. Vertical axis turbines (VAWT) received less attention than their horizontal-axis counterparts. A helical-bladed VAWT preferred because it makes perfect sense as an improvement design, they higher azi...

In this paper, we study the geodesic, asymptotic and slant helical trajectories according to PAFORS in three-dimensional Euclidean space give some characterizations on them. Also, explain how determine helix axis for (according PAFORS). Moreover, develop a method which enables us find trajectory (if exists) lying given implicit surface accepts fixed unit direction as an angle constant angle. Th...