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The Regulation of Oocyte Maturation
2003Publisher Summary This chapter reviews the signaling networks bringing about oocyte maturation of different species, emphasizing significant variability among animals at almost every level. The final development of fertilization competence of an oocyte—responsible for making it a fertilizable egg—usually occurs during the process of meiosis and is ...
Ekaterina, Voronina, Gary M, Wessel
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In Vitro Maturation of Oocytes
Seminars in Reproductive Medicine, 2005In vitro maturation of oocytes is a safe and effective treatment offered in some fertility centers for assisted reproduction, where immature oocytes are retrieved from unstimulated ovaries. Therefore, the procedure avoids ovarian stimulation with expensive gonadotropins, side effects of the medications, and risks such as ovarian hyperstimulation ...
G Durga, Rao, Seang Lin, Tan
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Regulation of Oocyte Maturation
1980Publisher Summary Oocytes have proved to be an optimal experimental system for several lines of investigation. One such line encompasses the biochemistry of cell division, in particular the relationship of calcium and cyclic nucleotide levels to the regulation of this process.
J L, Maller, E G, Krebs
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Current Opinion in Obstetrics and Gynecology, 2002
In contrast to conventional assisted reproduction techniques in which metaphase II oocytes are retrieved for fertilization in vitro, during the in-vitro maturation of oocytes, immature germinal vesicle stage oocytes are retrieved and matured in the laboratory before fertilization and embryo transfer.
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In contrast to conventional assisted reproduction techniques in which metaphase II oocytes are retrieved for fertilization in vitro, during the in-vitro maturation of oocytes, immature germinal vesicle stage oocytes are retrieved and matured in the laboratory before fertilization and embryo transfer.
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The Biochemistry of Oocyte Maturation
2002Oocyte maturation is a complex process that encompasses growth and differentiation of the oocyte, acquisition of meiotic competence, initiation and completion of nuclear maturation, and cytoplasmic changes related to fertilizability and post-fertilization developmental potential.
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Oocyte Maturation in Amphibians
1985This chapter presents a complex picture of the regulation of oocyte maturation. The events that have been identified can be expressed temporally on a relative time scale, as shown in Figure 8. A major question that lies ahead concerns which of these events is causal for subsequent events and for GVBD.
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Cryopreservation of Mature and Immature Oocytes
Clinical Obstetrics & Gynecology, 2010The aim of this chapter is to evaluate the current situation concerning oocyte freezing. Clinical outcome using slow cooling and vitrification was assessed in the literature and in our clinic to evaluate possible differences using either of the protocols.
Andrea, Borini, Veronica, Bianchi
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Immature oocyte retrieval with in-vitro oocyte maturation
Current Opinion in Obstetrics and Gynaecology, 1999Early studies of in-vitro fertilization used immature oocytes. The process evolved to retrieving metaphase II oocytes, and was eventually successful. At present, aggressive ovulation induction protocols are the mainstay of assisted reproductive technology programs, but not without increased cost, multiple gestations, morbidity, potential future risks ...
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Meiotic maturation in mollusc oocytes
Seminars in Cell & Developmental Biology, 1998Molluscs, annelids and other lower invertebrates belonging to the protostome group exhibit special features in their ionic regulation of meiotic maturation and in their molecular control of metaphase arrest. These oocytes proceed from prophase I upon fertilization or hormonal stimulation and then either complete meiotic maturation or secondarily arrest
P, Colas, F, Dubé
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Ultrastructure of Maturing Human Oocytes
Annals of the New York Academy of Sciences, 1985The material for study consisted of 41 nonatretic oocytes obtained at follicular aspiration in women in whom ovarian stimulation had been carried out. Collected oocytes were clinically classified as preovulatory and immature by the amount, dispersion, and viscosity of cumulus‐corona cells surrounding the oocytes.
P, Sundström +3 more
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