BACKGROUND There is some controversy about the extent of changes in different sperm cell features in stored boar semen, especially regarding the potential role of the DNA fragmentation assay for assessment of sperm fertilizing ability. The aim of this study was to assess the effect of time of storage and the dynamic changes in sperm cell characteristics in normospermic boar semen stored in long...

In Vitro Fertilization (IVF) is the penetration of ovum cells by spermatozoa in a culture system and reproductive technique that useful for increasing efficiency sperm utilization. vitro fertilization applied to overcome problem infertility prevent birth defects. The success IVF influenced quality spermatozoa. order fulfill this, it necessary select spermatozoa, which separate good from total p...

Bilim soru sormakla ve sonra cevapları aramakla başladığından, sorma cevaplamanın fen öğrenimi öğretiminde her zaman önemli bir rolü olmuştur. Bu çalışmanın amacı, biyoloji öğretmenlerinin soru-cevap sürecinin beş boyutuna (soruların kaynağı, soruların taksonomisi soruları cevaplayanlar, öğretmen geribildirimi cevap yetkisi) ilişkin özelliklerini incelemektir. Araştırmaya Türkiye’nin batısında ...

This article considers the origins of DNA damage in human spermatozoa, the methods that are available to monitor this aspect of semen quality and the clinical significance of such measurements. DNA damage in spermatozoa appears to be largely oxidative in nature, inversely correlated with levels of nuclear protamination and frequently associated with the activation of a truncated apoptotic pathw...

AIM The aim of this prospective study was to find possible relationship between ROS production measured by chemiluminescence and flow cytometry in human semen and sperm DNA damage estimated by Sperm Chromatin Structure Assay. METHODS Study included 39 men from infertile couples and 23 fertile volunteers who served as a control group. Aliquot of neat semen was used for ROS detection by chemilu...

OBJECTIVE To evaluate levels of sperm nuclear DNA damage in infertile men with normal and abnormal standard semen parameters. DESIGN Prospective study. SETTING Male infertility clinic. PATIENT(S) Ninety-two men seeking infertility treatment and 16 fertile volunteers. INTERVENTION(S) Standard semen analysis was performed according to the World Health Organization guidelines. MAIN OUTCO...