BACKGROUND The period in each menstrual cycle during which sexual intercourse can result in conception is called the "fertile window". Although the fertile window closes on the day of ovulation, little is known about the moment it opens. We defined the first day of normal sperm-mucus interaction as the opening of the fertile window. We hypothesized that length of the fertile window varies betwe...

BACKGROUND Embryo implantation requires a healthy embryo and a receptive uterus. Uterine incompetence contributes significantly to implantation failure and infertility. To date, there are no reliable biochemical methods that can determine whether the uterus is receptive. Proprotein convertase 5/6 (PC6) is tightly regulated in the uterus and critical for receptivity and implantation; its secreto...

We explore the impact of local economic conditions on the type and size of newly constructed housing. A slightly modified standard open monocentric city model predicts that, as long as land use regulation is relatively lax, positive local income shocks cause construction of more multifamily housing and smaller units. Exploiting metro area-level American Housing Survey (AHS) data from 1984 to 20...

background: infections are one of the correctable causes of infertility with low cost and cost effective treatment. the 50% of infertile cases is related to men in some way, and 30% of them are absolutely related to them. mycoplasmas are the smallest microorganisms with capability of dna replication. present study is planned to compare the mycoplasma infection in infertile men and men with esta...

Background: Heat-shock protein A2 (HspA2) is a testisspecific member of the HSP70 family known to play a critical role in spermatogenic cell differentiation. HspA2 is correlated with sperm maturity, function and fertility, and diminished expression of HspA2 results in abnormal sperm maturity and infertility. The aim of this study was to compare expression of HspA2 in fertile and infertile indiv...

Fluctuating asymmetry (FA) is the small random deviations from a perfect bilateral symmetry in a morphological trait. It is considered as an indicator of biological quality and developmental stability of individual. Adverse environmental conditions and high levels of sex steroids may increase FA. Symmetry in women was found to be related with phases of the menstrual cycles (MC). This cross sect...