Results 341 to 350 of about 280,910 (369)
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Molecular and Cellular Endocrinology, 2000
During oogenesis, germ cell numbers sharply decrease when meiosis is initiated. There is solid evidence (DNA ladders, in situ detection) that this loss is through apoptosis. Oocyte apoptosis appears to hit mitotic primordial germ cells (PGC), pachytene oocytes and early primordial follicles.
Reynaud, Karine +1 more
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During oogenesis, germ cell numbers sharply decrease when meiosis is initiated. There is solid evidence (DNA ladders, in situ detection) that this loss is through apoptosis. Oocyte apoptosis appears to hit mitotic primordial germ cells (PGC), pachytene oocytes and early primordial follicles.
Reynaud, Karine +1 more
openaire +3 more sources
2006
Embryonic stem cells (ESCs), derivatives of totipotential cells of early mammalian embryos, have proven to be one of the most powerful tools for studying developmental and stem cell biology. When injected into embryos, ESCs can contribute to tissues derived from all three germ layers and to the germ line. Prior studies have successfully shown that ESCs
Karin, Hübner +2 more
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Embryonic stem cells (ESCs), derivatives of totipotential cells of early mammalian embryos, have proven to be one of the most powerful tools for studying developmental and stem cell biology. When injected into embryos, ESCs can contribute to tissues derived from all three germ layers and to the germ line. Prior studies have successfully shown that ESCs
Karin, Hübner +2 more
openaire +2 more sources
Current Opinion in Obstetrics and Gynaecology, 1999
Storing oocytes is one of the challenges of assisted reproduction which may provide an alternative to embryo cryopreservation. Despite early disappointing results regarding survival, fertilization and cleavage rates, which led to only sporadic pregnancies in more than ten years, the recent introduction of technical modification greatly improved the ...
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Storing oocytes is one of the challenges of assisted reproduction which may provide an alternative to embryo cryopreservation. Despite early disappointing results regarding survival, fertilization and cleavage rates, which led to only sporadic pregnancies in more than ten years, the recent introduction of technical modification greatly improved the ...
openaire +3 more sources
Nature, 1980
In normal sexual differentiation, XX germ cells develop into oocytes in an ovary, and XY germ cells undergo spermatogenesis in a testis. In some genetic abnormalities of sexual differentiation, and other abnormal situations such as experimental mouse chimaeras, XX germ cells may be present in a male embryo1,2.
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In normal sexual differentiation, XX germ cells develop into oocytes in an ovary, and XY germ cells undergo spermatogenesis in a testis. In some genetic abnormalities of sexual differentiation, and other abnormal situations such as experimental mouse chimaeras, XX germ cells may be present in a male embryo1,2.
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Oocyte donation: a review [PDF]
BJOG: An International Journal of Obstetrics & Gynaecology, 1989 Summary. Oocyte donation provides an option for achieving pregnancy in women lacking functioning gonads, or in whom IVF techniques have failed to harvest adequate oocytes, or those who do not wish to use their own gametes because of hereditary disease. In agonadal women, artificial menstrual cycles are required before proceeding to gamete donation.
Peter Rogers +5 more
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Fertility and Sterility, 2006
To review historical and contemporary advances in oocyte-cryopreservation techniques and outcomes.Publications related to oocyte cryopreservation were identified through MEDLINE and other bibliographic databases.Oocyte cryopreservation can be used as an adjunct to conventional IVF and as an option for fertile women to electively cryopreserve their ...
John K, Jain, Richard J, Paulson
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To review historical and contemporary advances in oocyte-cryopreservation techniques and outcomes.Publications related to oocyte cryopreservation were identified through MEDLINE and other bibliographic databases.Oocyte cryopreservation can be used as an adjunct to conventional IVF and as an option for fertile women to electively cryopreserve their ...
John K, Jain, Richard J, Paulson
openaire +2 more sources
Seminars in Reproductive Medicine, 2000
The oocyte is dependent on granulosa cells to provide nutrients and regulatory signals. Granulosa cells must be at the appropriate stage of differentiation to initiate these signals and transmit them to the oocyte. Studies have shown that in vitro-matured oocytes from follicles in early stages of atresia are more competent to support embryonic ...
F L, Barnes, M A, Sirard
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The oocyte is dependent on granulosa cells to provide nutrients and regulatory signals. Granulosa cells must be at the appropriate stage of differentiation to initiate these signals and transmit them to the oocyte. Studies have shown that in vitro-matured oocytes from follicles in early stages of atresia are more competent to support embryonic ...
F L, Barnes, M A, Sirard
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Seminars in Reproductive Medicine, 2001
Human oocyte cryopreservation is potentially an alternative solution to the ethical problems arising from embryo storage. In addition, oocyte freezing is the only method to preserve the reproductive capacity for women at risk of losing it because of premature ovarian failure, pelvic diseases, surgery, or antineoplastic treatments.
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Human oocyte cryopreservation is potentially an alternative solution to the ethical problems arising from embryo storage. In addition, oocyte freezing is the only method to preserve the reproductive capacity for women at risk of losing it because of premature ovarian failure, pelvic diseases, surgery, or antineoplastic treatments.
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Placenta, 2008
Over the last few years, there has been renewed interest and scientific debate concerning human oocyte cryopreservation. The aim of this study was to analyse the clinical data coming from our long experience of slow-freezing oocytes. Between 2001 and 2007, 1280 thawing cycles were carried out using oocytes previously frozen by means of a slow 1,2 ...
E, Albani +5 more
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Over the last few years, there has been renewed interest and scientific debate concerning human oocyte cryopreservation. The aim of this study was to analyse the clinical data coming from our long experience of slow-freezing oocytes. Between 2001 and 2007, 1280 thawing cycles were carried out using oocytes previously frozen by means of a slow 1,2 ...
E, Albani +5 more
openaire +2 more sources
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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