Background: Cryopreservation of in vitro matured oocytes is a useful technique because the oocytes can be used for some assisted reproductive technologies. On the other hand, the cryopreservation of oocytes is an open problem as a result of their structural sensitivity to the freezing process. The purpose of this study was to evaluate the effect of vitrification on in vitro development of vitri...

Recent studies suggest that developmental check-points in B-lymphopoiesis are set in order to test the B cell receptor signaling competence. In these check-points ligand-independent and ligand-dependent receptor signals confer B-lymphopoiesis with positive and negative selection events. As a consequence, B-lymphocytes are forced to make crucial fate decisions to determine developmental progress...

The article considers the criterion apparatus and methods of diagnostics musical-rhythmic competence future teachers music choreography. structure this phenomenon defines: information-oriented, musical-developmental productive-creative components, each which includes elements that characterize reveal their essence. information-oriented component is characterized by content educational material,...

The epigenetic factors causing competence differences between SN (surrounded nucleolus) and NSN (non-surrounded nucleolus) oocytes, the significance for the increased histone acetylation and methylation in SN oocytes, and whether chromatin configuration or histone modification determines oocyte competence, are unclear. This study has addressed these issues by using the ovary-holding (OH) stress...

In bacterial differentiation, mechanisms have evolved to limit cells to a single developmental pathway. The establishment of genetic competence in Bacillus subtilis is controlled by a complex regulatory circuit that is highly interconnected with the developmental pathway for spore formation, and the two pathways appear to be mutually exclusive. Here we show by in vitro and in vivo analyses that...

The aim of this study was to compare the expression of selected genes in bovine embryos developed from oocytes with different developmental competence. Four oocyte populations were collected, separately either from small (2-5 mm) or medium (6-10 mm) follicles, in the growth/stagnation (G/S) or dominance/regression (D/R) stage of the first follicular wave. They were matured, fertilized and cultu...