نتایج جستجو برای: fertilization ability
تعداد نتایج: 449509 فیلتر نتایج به سال:
The development of in vitro fertilization in the 1970s has revolutionized the treatment of infertility. In the US, 126 procedures are performed per million people each year. The ability to culture embryos in vitro has allowed the development of preimplantation genetic diagnosis (PGD). PGD is similar to the prenatal diagnosis used to screen for various genetic diseases before birth, but its adva...
The purpose of this study was to examine: 1) whether caffeine in the fertilization medium under mineral oil is essential for bovine in vitro fertilization by fully capacitated spermatozoa, 2) the minimum concentration of caffeine that shows an adverse effect on the motility of preincubated spermatozoa. Cumulus-oocyte complexes with heterogeneous-appearing ooplasm were matured in in vitro cultur...
Infectious diseases have been a prime testing ground for ecological theory. However, the ecological perspective is increasingly recognized as essential in epidemiology. Long-term, spatially resolved reliable data on disease incidence and the ability to test them using mechanistic models have been critical in this cross-fertilization. Here, we review some of the key intellectual developments in ...
Background Egg yolk is the main cryoprotectant agent in semen freezing extenders which is used in order to protect spermatozoa against cold shock. However elimination of animal bioproducts from the cryopreservation protocol is becoming mandatory. Therefore the aim of this study is to compare a previously studied homemade soya bean lecithin based extender with a commercially available extender f...
In competition-dominated communities, traits promoting resource conservation and competitive ability are expected to have an important influence on species relative abundance (SRA). Yet, few studies have tested the trait-abundance relations in the line of species trade-off in resource conservation versus acquisition, indicating by multiple traits coordination. We measured SRA and key functional...
In fish, in vitro fertilization is an important reproductive tool used as first step for application of others biotechniques as chromosome and embryo manipulation. In this study, we aimed to optimize gamete quality and their short-term storage from the yellowtail tetra Astyanax altiparanae, for future application in laboratory studies. Working with sperm, we evaluated the effects of spawning in...
Background and purpose: Diabetes is one of the major factors that affects fertility and ovulation and can disrupt the formation of fetus. Omega-3 polyunsaturated fatty acids might be able to improve the quality of the embryo in maturation of oocytes. The aim of this study was to investigate the effects of omega-3 on ovarian tissue and the development of blastocysts in diabetic rats. Material...
BACKGROUND AND AIMS An intense pollen-pistil interaction precedes fertilization. This interaction is of particular relevance in agronomically important species where seeds or fruits are the edible part. Over time some agronomically species have been selected for the ability to produce fruit without seeds. While this phenomenon is critical for commercial production in some species, very little i...
Background Following sperm penetration, oocyte is activated by sperm oocyte activating factors (SOAFs) released by sperm. Spermspecific phospholipase C isoform ζ (PLCζ) and post acrosomal WW binding protein (PAWP) are two nominees for the SOAF. PLCζ is located back-to-back with another testis-specific gene called CAPZA3. These two genes share a common bidirectional promoter. In this study we as...
Oocytes of LT/Sv mice have anomalous cytoplasmic and nuclear maturation. Here, we show that in contrast to the oocytes of wild-type mice, a significant fraction of LT/Sv oocytes remains arrested at the metaphase of the first meiotic division and is unable to undergo sperm-induced activation when fertilized 15 hours after the resumption of meiosis. We also show that LT/Sv oocytes experimentally ...
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