objective(s):althoughroutinely applied in assisted reproductive technology, human sperm cryopreservation is not a completely successful procedure. adverse effects of cryopreservation on the fertilization capacity, motility, morphology, and viability of spermatozoa have been proven; cryopreservation has also shown a role in sperm dna fragmentation and infertility. the post-thaw survival of sperm...

introduction: based on human studies, inequality and social injustice have adverse effects on the individual and community health. in this study, the effects of food intake inequality and social status changes on pain perception and immunological factors were investigated in balb/c mice. methods: the present study was conducted by implementing different social stresses including food deprivatio...

The maintenance of genetic polymorphism under various natural structured viability regimes vs. general unrestricted fitness assignments are compared. The selection models considered include a generalized dominance fitness system, a generalized viability model based on allelic activity values, viability matrices based on multilocus activity levels, viability matrices defined by partitioned "reso...

BACKGROUND In humans, sperm DNA fragmentation rates have been correlated with sperm viability rates. Reduced sperm viability is associated with high sperm DNA fragmentation, while conversely high sperm viability is associated with low rates of sperm DNA fragmentation. Both elevated DNA fragmentation rates and poor viability are correlated with impaired male fertility, with a DNA fragmentation r...

objective: thymoquinone (tq), as the main component of nigella sativa plant, shows anticancer properties. this study was aimed to evaluate the combined effect of tq and tamoxifen (tam) on viability and apoptosis of human breast cancer cell lines. materials and methods: in this experimental study, estrogen positive mcf-7 and estrogen negative mda-mb-231 human breast cancer cell lines were induce...

i ntroduction: assessment of cellular cytotoxicity is a regular method for evaluating the biocompatibility of novel materials. in a recent study, 5% fluoride varnish (duraflur) has shown reasonable sealing ability and coverage of root canal walls when used as a sealer. the aim of the present study was to compare cytotoxicity of duraflur varnish with two popular commonly used root canal sealers ...

The presence and severity of ischemic left ventricular (LV) systolic dysfunction is an important predictor of prognosis. There are ample data demonstrating that for patients with coronary artery disease and ischemic LV dysfunction, revascularization is associated with a better prognosis compared with medical therapy alone. In addition, varying degrees of recovery of LV dysfunction can be observ...

We investigated the use of amperometric and chronoamperometric methods with a double mediator system and screen-printed electrodes (SPEs) for the electrochemical sensing of hepatocyte viability. Cell counts were determined based on measuring cellular respiration via interaction of electroactive redox mediators. The oxidation currents of chronoamperometric measurement were proportional to the co...

A landscape-scale approach is critical for the conservation of pond-breeding amphibians. Individual demes at one or a few closely linked breeding sites are highly susceptible to local extinction. Recruitment in pond-breeding amphibians is often sensitive to hydroperiod and predation, and these factors can fluctuate greatly from year-to-year (Semlitsch et al., 1996). As a result, pond-breeding a...

The standard PCR technique allows the rapid detection of microorganisms, difficult to detect by traditional culture methods. However, the control of samples through PCR has the drawback of false positives due to amplification of DNA/RNA of non-viable cells. This can be overcome by adding intercalating agents (EMA or PMA) to the sample, which selectively penetrates nonviable cells and blocks the...