Results 341 to 350 of about 380,066 (397)
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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
+5 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
+5 more sources
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
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
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
Best Practice & Research Clinical Obstetrics & Gynaecology, 2002
Oocyte donation affords women with ovarian failure, advanced reproductive age, heritable conditions or recurrent implantation failure the ability to conceive. Recipients must be medically screened carefully prior to attempting pregnancy. Egg donors should also be healthy and pose no infectious or genetic risk to the recipient or offspring.
Jeffrey, Klein, Mark V, Sauer
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Oocyte donation affords women with ovarian failure, advanced reproductive age, heritable conditions or recurrent implantation failure the ability to conceive. Recipients must be medically screened carefully prior to attempting pregnancy. Egg donors should also be healthy and pose no infectious or genetic risk to the recipient or offspring.
Jeffrey, Klein, Mark V, Sauer
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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.
openaire +2 more sources
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.
openaire +2 more sources
Ugeskrift for laeger, 2021
The number of treatments with donated oocytes has risen markedly in Denmark during the latest decade due to changes in legislation and because female age is increasingly advanced when fertility treatment is warranted. Today, oocyte donation is a standard procedure offering the otherwise untreatable a high chance of achieving a pregnancy.
Larsen, Elisabeth Clare +2 more
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The number of treatments with donated oocytes has risen markedly in Denmark during the latest decade due to changes in legislation and because female age is increasingly advanced when fertility treatment is warranted. Today, oocyte donation is a standard procedure offering the otherwise untreatable a high chance of achieving a pregnancy.
Larsen, Elisabeth Clare +2 more
openaire +2 more sources
Cloning and Stem Cells, 2005
In assisted human reproduction, the cytoplasm of oocytes recovered from follicles is often abnormal. Its lower quality, especially in older patients, may be responsible for certain chromosomal abnormalities or developmental arrest. Thus, the deficiency of some vital molecules, which are necessary for oocyte maturation, can be the cause of infertility ...
FULKA J. JR +3 more
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In assisted human reproduction, the cytoplasm of oocytes recovered from follicles is often abnormal. Its lower quality, especially in older patients, may be responsible for certain chromosomal abnormalities or developmental arrest. Thus, the deficiency of some vital molecules, which are necessary for oocyte maturation, can be the cause of infertility ...
FULKA J. JR +3 more
openaire +3 more sources
Biochimie, 1979
The main elements of reproduction are exposed with emphasis on its preparation during the larval stage. The system oocyte-nurse cells-follicular cells is described and the principal features of egg morphogenesis are indicated. Two types of problems are concentrated on : 1) sequential determination of growth and evolution of the follicle in the ovarian ...
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The main elements of reproduction are exposed with emphasis on its preparation during the larval stage. The system oocyte-nurse cells-follicular cells is described and the principal features of egg morphogenesis are indicated. Two types of problems are concentrated on : 1) sequential determination of growth and evolution of the follicle in the ovarian ...
openaire +2 more sources