Results 231 to 240 of about 264,880 (269)
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Oocyte donation: not all oocyte cryobanks are the same
Reproductive BioMedicine Online, 2022Is the efficacy of imported vitrified oocyte donation affected by the cryobank of origin?Longitudinal cohort study, including 249 completed oocyte warming cycles from 200 recipients (January 2016-July 2020). No severe male factor was included. Vitrified oocytes were provided by three Spanish cryobanks. Primary outcome was cumulative live birth delivery
Luca Gianaroli +8 more
openaire +3 more sources
Human Reproduction Update, 2020
BACKGROUND Within the antral follicle, the oocyte is reliant on metabolic support from its surrounding somatic cells. Metabolism plays a critical role in oocyte developmental competence (oocyte quality).
D. Richani +3 more
semanticscholar +1 more source
BACKGROUND Within the antral follicle, the oocyte is reliant on metabolic support from its surrounding somatic cells. Metabolism plays a critical role in oocyte developmental competence (oocyte quality).
D. Richani +3 more
semanticscholar +1 more source
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
openaire +3 more sources
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
openaire +2 more sources
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 ...
openaire +3 more sources
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.
openaire +3 more sources
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
openaire +3 more sources
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
openaire +2 more sources
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
openaire +2 more sources
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
openaire +2 more sources
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
openaire +2 more sources
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