During the angiosperm (flowering-plant) life cycle, double fertilization represents the hallmark between diploid and haploid generations [1]. The success of double fertilization largely depends on compatible communication between the male gametophyte (pollen tube) and the maternal tissues of the flower, culminating in precise pollen tube guidance to the female gametophyte (embryo sac) and its r...

OBJECTIVE To estimate whether exercise before the first cycle of in vitro fertilization (IVF) affects cycle outcomes. METHODS A total of 2,232 patients were prospectively enrolled before undergoing their first cycle of IVF for the treatment of infertility from 1994-2003 at three IVF clinics in the greater Boston area. The primary IVF outcomes of interest included successful live birth and fou...

background in iranian folk medicine ruta graveolens has been used for female and male contraceptive. there are few studies about the effect of this plant on spermatogenesis. objectives in this study the effect of long term administration of aqueous extract of rg on spermatogenesis has been investigated. materials and methods animals were allocated into 1) control: which did not receive anything...

OBJECTIVE To assess the usefulness of the vitrification method in clinical practice. DESIGN Clinical study of vitrification of human oocytes. SETTING A university-affiliated hospital. PATIENT(S) Thirty-four patients who agreed to undergo additional IVF-ET after the failed fresh cycle using the previously vitrified/thawed oocytes. INTERVENTION(S) Surplus oocytes from the IVF-ET patients ...

Ovoperoxidase, an enzyme secreted by the eggs of the sea urchin Stronglycocentrotus purpuratus upon activation, catalyzes the formation of dityrosine residues in the fertilization envelope. This cross-linking reaction requires extracellular H2O2, which is produced by the egg during the cyanide-insensitive "respiratory burst" of fertilization. While investigating the possibility that the sea urc...

OBJECTIVE Globozoospermia is a rare type of teratozoospermia with incidence of 0.1% among infertile individuals. Phospholipase C zeta (PLCζ) and postacrosomal sheath WW domain binding protein (PAWP) are the main candidates in sperm taking responsibility for oocyte activation during fertilization. Therefore, we aimed to evaluate the expression of these two genes at RNA and protein levels in glob...

INTRODUCTION Some unexplained infertile couples may have fertilization failure; the in vitro fertilization (IVF) with high insemination concentration (HIC) and intracytoplasmic sperm injection (ICSI) were reported to give better fertilization rate when compared to standard IVF procedure. OBJECTIVE To compare the fertilization rate, abnormal fertilization rate, total fertilization failure rate...

The egg of Rana clamitans enrobed in its native jelly was not fertilized by sperm of R. pipiens. However, when R. clamitans eggs were enrobed by R. pipiens jelly, they were fertilized by R. pipiens sperm. Male pronuclei were found in the eggs, and most of the resulting embryos were diploid. The embryos gastrulated, but most arrested at midto late gastrula stages. Some begun neurulation, but non...