Abstract The study was executed to investigate the different cooling periods (0, 24, and 48 hours) effects on plasma membrane integrity depending hypo osmotic swelling test (HOST), spermatozoa motility, acrosome integrity, live sperm, abnormalities, correlation among Host other rams sperm parameters This done at an animal farm in Al-Kut city (southern Baghdad city\ Iraq), from 5th January Febru...

The purpose of this study was to investigate the efficiency of the water test to evaluate the functional membrane integrity of ejaculated canine sperm after collecting, cooling, and freezing-thawing. Twenty-five ejaculates were obtained from 12 stud dogs by digital manipulation. Sperm-rich fractions were evaluated, diluted, cooled at 5oC and frozen-thawed. A conventional hypo-osmotic swelling t...

evidence supports the involvement of nitric oxide (no) in a varity of male reproductive processes such as spermatogenesis, spermiogenesis, sperm motion, sperm metabolism and sperm capacitation. however, low concentration of no is essential in biology and physiology of spermatozoa, but high amounts of no is toxic and has negative effects on sperm functions. on the other hand, it is established t...

Physically distinct cholesterol/sphingolipid-rich plasma membrane microdomains, so-called lipid rafts, have been recognized to play an important regulatory role in various cellular processes, from membrane trafficking to signal transduction, in a number of cell types. We report here that the ability of TCR on activated, functional CD8+ T lymphocytes to efficiently bind MHC class I tetramer comp...

Methods for assessing mammalian cell death are presented in this article, which is divided into six sections: (1) a brief overview of cytotoxicity and pathways death; (2) method to measure using lactate dehydrogenase (LDH) release as marker membrane integrity; (3) flow cytometry that simultaneously measures two types death, necrosis apoptosis; (4) use fluorescence microscopy nuclear morphology ...

Cytotoxic T lymphocytes and natural killer cells destroy target cells via the polarized exocytosis of lytic effector proteins, perforin and granzymes, into the immunologic synapse. How these molecules enter target cells is not fully understood. It is debated whether granzymes enter via perforin pores formed at the plasma membrane or whether perforin and granzymes are first endocytosed and granz...

The platelet plasma membrane is lined by a membrane skeleton that appears to contain short actin filaments cross-linked by actin-binding protein. Actin-binding protein is in turn associated with specific plasma membrane glycoproteins. The aim of this study was to determine whether the membrane skeleton regulates properties of the plasma membrane. Platelets were incubated with agents that disrup...

The aim of this study was to assess whether refractoriness to long photoperiod (LP) could be reversed by subjecting tomcats to a period of short days. Our hypothesis was that photoperiod changes can avoid refractoriness and restore sperm quality and production to that before refractoriness. Tomcats (n = 6) were housed in a conditioned room with LP (12L: 12D) for 45 days of acclimation and then ...

Cadherins are essential in many fundamental processes and assemble at regions of cell-cell contact in large macromolecular complexes named adherens junctions. We have identified flotillin 1 and 2 as new partners of the cadherin complexes. We show that flotillins are localised at cell-cell junctions (CCJs) in a cadherin-dependent manner. Flotillins and cadherins are constitutively associated at ...