Results 371 to 380 of about 415,920 (397)
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Cytoplasmic control of nuclear behavior during meiotic maturation of frog oocytes.
The Journal of experimental zoology, 1971Fully grown oocytes of the frog (Rana pipiens) undergo cytoplasmic and nuclear maturation when treated with progesterone after the follicular envelopes have been removed.
Y. Masui, C. Markert
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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
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Hydrobiologia, 2005
The morphological features of polychaete ovarian morphology and oogenesis are reviewed. Some basic information on ovarian structure and/or oogenesis is known for slightly more than half of recognized polychaete families although comprehensive studies of oogenesis have been conducted on ∼0.1% of described species. Relative to other major metazoan groups,
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The morphological features of polychaete ovarian morphology and oogenesis are reviewed. Some basic information on ovarian structure and/or oogenesis is known for slightly more than half of recognized polychaete families although comprehensive studies of oogenesis have been conducted on ∼0.1% of described species. Relative to other major metazoan groups,
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Oocyte cryopreservation: oocyte assessment and strategies for improving survival
Reproduction, Fertility and Development, 2007Despite significant progress in cryopreservation of mammalian oocytes and embryos, many of the molecular and biochemical events that underlie this technology are poorly understood. In recent years, researchers have focused on obtaining viable oocytes that are developmentally competent. Even under the most favourable conditions, experimental approaches
LEDDA, Sergio +6 more
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Gamete Research, 1989
AbstractHamster oocytes were frozen using a 1,2‐propanediol‐sucrose procedure, which resulted in over 90% survival. After thawing and zona removal the oocytes were compared with non‐frozen oocytes in a zona‐free hamster egg test employing spermatozoa from human semen donors and suspected infertility patients. Similar data were obtained, indicating that
Ralph B. L. Gwatkin +2 more
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AbstractHamster oocytes were frozen using a 1,2‐propanediol‐sucrose procedure, which resulted in over 90% survival. After thawing and zona removal the oocytes were compared with non‐frozen oocytes in a zona‐free hamster egg test employing spermatozoa from human semen donors and suspected infertility patients. Similar data were obtained, indicating that
Ralph B. L. Gwatkin +2 more
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Cryoconservation: Sperms and Oocytes
1997From the moment of fertilization onwards, life processes run by the rhythm of a biological clock. The technology of cryopreservation gives us the possibility of interfering with the clockwork by stopping biological time. Cryopreservation of a cell therefore involves the cooling of a cell and storage at a temperature where all metabolic processes are ...
Van Steirteghem, Andre +2 more
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Maturitas, 1998
Correlations between parental age, aneuploidy in germ cells and recent findings on aetiological factors in mammalian trisomy formation are reviewed.Data from observations in human oocytes, molecular studies on the origin of extra chromosomes in trisomies, experiments in a mouse model system, and transgenic approaches are shown.Errors in chromosome ...
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Correlations between parental age, aneuploidy in germ cells and recent findings on aetiological factors in mammalian trisomy formation are reviewed.Data from observations in human oocytes, molecular studies on the origin of extra chromosomes in trisomies, experiments in a mouse model system, and transgenic approaches are shown.Errors in chromosome ...
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Full-term development of mice from enucleated oocytes injected with cumulus cell nuclei
Nature, 1998T. Wakayama +7 more
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Appearance of Water Channels in Xenopus Oocytes Expressing Red Cell CHIP28 Protein
Science, 1992G. Preston +3 more
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