background: sperm selection is generally used to describe methods for separation of spermatozoa for in-vitro-assisted reproduction. few studies reported relation in vivo fertility and semen parameters after selection of fertile spermatozoa; hence, our research attempt to assess different semen parameters after post-thaw (pt) or after selecting sperm sample (ssp), using density gradient separati...

Background sperm selection is generally used to describe methods for separation of spermatozoa for in-vitro-assisted reproduction. Few studies reported relation in vivo fertility and semen parameters after selection of fertile spermatozoa; hence, our research attempt to assess different semen parameters after post-thaw (PT) or after selecting sperm sample (SSp), using density gradient separatio...

objective(s) herpes simplex viruses (hsvs) have widespread and ubiquitous prevalence in the human population and they have received a great deal of attention due to the range of diseases, they caused as a result of an infection. it seems that the fast and reliable diagnostic methods are needed for detecting the herpes simplex virus type 1 (hsv1) antibodies especially in patients with hsv enceph...

In present work, we have calculated the electronic properties including density of states and electron density for GaN, InN and InxGa1-xN  in wurtzite phase for x=0.5. The study is based on density functional theory with full potential linearized augmented plane wave method by generalized gradient approximation for calculating electronic properties. In this report we concluded that InxGa1-xN ba...

In 1957, Meselson, Stahl, and Vinograd 1 introduced the remarkable technique of sedimentation equilibriuln in a density gradient for the study of the properties of high molecular weight DNA in solution. Because of the very high molecular weights of DNA, conventional sedimentation equilibrium cannot be used; for even at the lowest centrifugal fields which are practical, the force on these molecu...

The PSP model [1], a generalized Surface-Potential (SP) model, has been chosen to be an industry standard for the next generation, 60nm, technology. In order to include quantum effects within surface potential models we use asymptotic analysis techniques [2], [3] applied to the the Density-Gradient equations [4]. Our quantum modified surface potential (SP) results from the ability to obtain a f...

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...