Escherichia coli bacteria use rotating helical flagella to swim. At this scale, viscous effects dominate inertia, and there are significant hydrodynamic interactions between nearby helices. These interactions cause the flagella to bundle during the "runs" of bacterial chemotaxis. Here we use slender-body theory to solve for the flow fields generated by rigid helices rotated by stationary motors...

Dimerization of transmembrane (TM) α helices of membrane receptors plays a key role in signaling. We show that molecular dynamics simulations yield models of integrin TM helix heterodimers, which agree well with available NMR structures. We use a multiscale simulation approach, combining coarse-grained and subsequent atomistic simulation, to model the dimerization of wild-type (WT) and mutated ...

This study discusses the behavior of ambient-cured circular geopolymer concrete specimens tested under different loading conditions. Twelve were cast and to investigate influence type reinforcement, that is, steel glass fiber-reinforced polymer (GFRP), pitch transverse conditions (concentric axial load, 15 35 mm eccentric four-point bending). The load carrying capacity, confinement efficiency, ...

Degenerate Dowling and degenerate r-Dowling polynomials were introduced earlier as versions further generalizations of polynomials. The aim this paper is to show their connections with Poisson central moments for a random variable certain parameter Charlier

This study analyses (k,m)-type slant helices in compliance with the modified orthogonal frame 3-dimensional Euclidean space ($\mathbb{E}^{3}$). Furthermore, we perform some characterisations of curves frames $\mathbb{E}^{3}$.

When purified dimers of hemagglutinin-neuraminidase molecules released by protease digestion from three strains of human parainfluenza virus 1 were used in crystallization trials, long thin needle crystals formed. Electron microscopic analysis of these needle crystals revealed that they are composed of stacks of triple-stranded helices with each strand of the helix made up of subunits of hemagg...

Seipin is a disk-like oligomeric endoplasmic reticulum (ER) protein important for lipid droplet (LD) biogenesis and triacylglycerol (TAG) delivery to growing LDs. Here we show through biomolecular simulations bridged experiments that seipin can trap TAGs in the ER bilayer via luminal hydrophobic helices of protomers delineating inner opening disk. This promotes nanoscale sequestration at concen...

The Saccharomyces cerevisiae respiratory supercomplex factor 2 (Rcf2) is a 224-residue protein located in the mitochondrial inner membrane where it involved formation of supercomplexes composed cytochrome bc1 and c oxidase. We previously demonstrated that Rcf2 forms dimer dodecylphosphocholine micelles, here we report solution NMR structure this dimer. Each monomer has two soluble α helices fiv...