Sperm selection techniques have became an important tool to improve sub fertile ejaculates. The main aim of this study was to assess the dynamics of motile sperm subpopulations of ejaculates from subfertile stallions subjected to density gradient centrifugation (DGC) involving a double layer colloid [DGC2], before and after storage for 24 and 48 hours. Ejaculates from eight stallions with ferti...

R-Ras has a high degree of sequence homology with Ras and other members of the Ras subfamily, including Rap, TC21, and M-Ras. Although R-Ras has been suggested to regulate cell adhesion, migration, and invasion, the biological mechanism has not been well assessed. In this report, we show that constitutively active R-Ras (38V) induces a more rounded cell shape and redistribution of focal adhesio...

Random motility and chemotaxis of peripheral blood neutrophils and monocytes from patients with Crohn's disease and ulcerative colitis have been measured using a modified Boyden Chamber filter assay. Increased random motility and chemotaxis of monocytes were found in patients with active ulcerative colitis. Monocyte motility was normal in Crohn's disease and no abnormality of neutrophil motilit...

Objective Crocin, a carotenoid isolated from Crocus sativus L. (saffron), is a pharmacologically active component of saffron. Nicotine consumption can decrease fertility in males through induction of oxidative stress and DNA damage. The aim of this study is to determine the effects of crocin on reproductive parameter damages in male mice exposed to nicotine. MaterialsAndMethods In this experime...

Non-equilibrium processes which convert chemical energy into mechanical motion enable the motility of organisms. Bundles of inextensible filaments driven by energy transduction of molecular motors form essential components of micron-scale motility engines like cilia and flagella. The mimicry of cilia-like motion in recent experiments on synthetic active filaments supports the idea that generic ...

We investigate how the competing presence of a nonuniform motility landscape and an external confining field affects properties active particles. employ Ornstein-Uhlenbeck particle (AOUP) model with periodic swim-velocity profile to derive analytical approximations for steady-state probability distribution position velocity, encompassing both Unified Colored Noise Approximation theory potential...

Abstract Meso-scale turbulence was originally observed experimentally in various suspensions of swimming bacteria, as well the collective motion active colloids. The corresponding large scale dynamical patterns were reproduced a simple model polar fluid, assuming constant density particles. Recent, more detailed studies variety experimental realizations fluids revealed additional interesting as...