Metaphase II oocytes were collected and submitted to in vitro fertilization and their fertilization rates and development to the blastocyst stage were evaluated.
We investigated two components of sexual selection in the Moor frog (Rana arvalis), pre-copulatory female choice between two males of different size ('large' vs. 'small'), and their fertilization success in sperm competition and in isolation.
Birds and mammals, phylogenetically close amniotes with similar post-gastrula development, exhibit little conservation in their post-fertilization cleavage patterns.
RM anova revealed a clear effect of increasing time of gamete exposure on fertilization success, but no differences between farm and wild males in their rates of fertilization.
The purpose of this study was to compare the effectiveness of a thorough sonographic oocyte retrieval to a routine in vitro fertilization retrieval to induce ovulation, pregnancy, and endocrine changes in patients with polycystic ovarian syndrome in their post in vitro fertilization cycles.
For the four functional groups, species richness differed in their response to different fertilization.
Although the species elemental concentrations differed in their response to CO2 fertilization, the +CO2 treatment effect was weakened by an acceleration of cell senescence in both species, as shown by a decrease in photosynthetic pigment and nitrogen concentration, discolouration and stress symptoms at the cell level; the latter were stronger in beech than spruce.
"In twenty to forty years, at least in the developed world, most babies could be conceived through in-vitro fertilization, so that their parents can choose among embryos,'' Hank Greely, a professor at Stanford Law School and the director of the university's Center for Law and the Biosciences, told me.
Presented in suitably Pernicean chipboard vitrines, the models can seem architecturally plausible and current in their asymmetrical forms, cross-fertilization of commercial and residential formats and vivid touches of color and tiny images.
Objective: To investigate the chromatin status of oocytes and their ploidity in order to consider possible genetic reasons for their unsuccessful fertilization in vitro.
