Listar por tema "oocyte"
Mostrando ítems 1-20 de 21
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The activity of three glycosidases (β-Ν-acetyloglucosaminidase, α-mannosidase, and β-galactosidase) in the follicular fluid and in the maturation medium affects bovine oocyte maturation
(2016)We studied the role of follicular fluid's (FF) glycosidase (α-mannosidase [α-ΜΑΝ], β-Ν-acetyloglucosaminidase [NAGASE], β-galactosidase [β-GAL]) activity during IVM of bovine oocytes. Oocytes were allocated into two groups ... -
Artificial oocyte activation: physiological, pathophysiological and ethical aspects
(2019)Infertile couples with low oocyte yield in combination with abnormal semen parameters may experience intra-cytoplasmic sperm injection (ICSI) failure. An established factor associated with ICSI failure is oocyte activation ... -
Bioethics in human embryology: the double-edged sword of embryo research
(2022)There has been a significant increase in the use of assisted reproductive therapies (ARTs) over the past several decades, allowing many couples with infertility to conceive. Despite the achievements in this field, a mounting ... -
COVID-19 and fertility: a virtual reality
(2020)The COVID-19 pandemic is an extraordinary global situation, and all countries have adopted their own strategies to diminish and eliminate the spread of the virus. All measures are in line with the recommendations provided ... -
Developmental competence of heat stressed oocytes from Holstein and Limousine cows matured in vitro
(2021)The negative effects of heat stress on dairy cattle's fertility have been extensively studied, but the relevant knowledge for beef cattle is rather limited. The aims of this study were to investigate the effects of HS ... -
The effect of diclofenac and paracetamol on pregnancy and implantation rates in infertile women undergoing IVF treatment
(2006)We set out to assess the effect of diclofenac on implantation rates, when administered as analgesia following transvaginal oocyte recovery. This was a prospective study of infertile women undergoing IVF treatment in a ... -
Effects of ghrelin on activation of Akt1 and ERK1/2 pathways during in vitro maturation of bovine oocytes
(2017)The purpose of this study was to investigate the possible molecular pathways through which ghrelin accelerates in vitro oocyte maturation. Bovine cumulus-oocyte complexes (COCs), after 18 or 24 h maturation in the absence ... -
The effects of heat shock protein 70 addition in the culture medium on the development and quality of in vitro produced heat shocked bovine embryos
(2021)The aims of the present study were to examine the effects of HSP70 addition in the in vitro culture medium of day 3 embryos on their developmental competence and quality. Bovine oocytes (n = 1442) were in vitro matured, ... -
Efforts to create an artificial testis: Culture systems of male germ cells under biochemical conditions resembling the seminiferous tubular biochemical environment
(2005)Induction of meiotic and post-meiotic alterations of male germ cells in vitro has been the target of several research efforts since 1960. However, to date, the establishment of an ideal culture system in which spermatogonial ... -
Epigenetic, genetic and maternal effects enable stable centromere inheritance
(2022)Centromeres are defined epigenetically by the histone H3 variant CENP-A. The propagation cycle by which pre-existing CENP-A nucleosomes serve as templates for nascent assembly predicts the epigenetic memory of weakened ... -
Genes and conditions controlling mammalian pre-and post-implantation embryo development
(2015)Embryo quality during the in vitro developmental period is of great clinical importance. Experimental genetic studies during this period have demonstrated the association between specific gene expression profiles and the ... -
Heat shock protein 70 improves in vitro embryo yield and quality from heat stressed bovine oocytes
(2021)Heat shock protein 70 (HSP70) is a chaperon that stabilizes unfolded or partially folded proteins, preventing inappropriate inter-and intramolecular interactions. Here, we examined the developmental competence of in vitro ... -
Laparoscopic intrauterine insemination in superovulated Chios breed ewes [Λαπαροσκοπική ενδομητριαία σπερματέγχυση σε προβατίνες φυλής Χίου μετά από πρόκληση πολλαπλής ωοθυλακιορρηξίας]
(2018)In this study the standardization of a simplified method for laparoscopic insemination of ewes is described and the firstresults of its application in 26 donors ewes of Chios breed.Superovulation was induced by i.m. ... -
Mild versus conventional ovarian stimulation for poor responders undergoing IVF/ICSI
(2017)Background/Aim: Mild stimulation protocols have been implemented to be offered to subfertile patients who respond poorly to ovarian stimulation. We aimed to compare the efficacy of mild versus conventional gonadotropin-releasing ... -
Molecular and Cellular Mechanisms of Sperm-Oocyte Interactions Opinions Relative to in Vitro Fertilization (IVF)
(2014)One of the biggest prerequisites for pregnancy is the fertilization step, where a human haploid spermatozoon interacts and penetrates one haploid oocyte in order to produce the diploid zygote. Although fertilization is ... -
Oocyte pick-up in juvenile lambs affects neither onset of puberty nor their future fertility
(2006)A study was designed to evaluate whether the time of onset of puberty and fertility of young ewe lambs would be affected by oocyte pick-up conducted in single or repeated sessions during the first months of lambs' live. ... -
Reporting on the Role of miRNAs and Affected Pathways on the Molecular Backbone of Ovarian Insufficiency: A Systematic Review and Critical Analysis Mapping of Future Research
(2021)Ovarian insufficiency is identified as a perplexing entity in the long list of pathologies impairing fertility dynamics. The three distinct classifications of ovarian insufficiency are poor ovarian response, premature ... -
Response to: Premature ovulation; is any risk small enough to take when avoidable?
(2021)[No abstract available] -
SARS-CoV-2 vs. human gametes, embryos and cryopreservation
(2021)The COVID-19 pandemic, caused by the SARS-CoV-2 virus, is an unprecedented global situation, and all countries have adopted their own measurements to mitigate the spread of the virus in the first as well as in the subsequent ... -
Sperm contributions to oocyte activation: more that meets the eye
(2016)It is well known that for successful fertilization, oocyte activation is required, which involves a signal transduction cascade leading to the conversion of the oocyte to a diploid embryo. During oocyte activation, ...