Results 141 to 150 of about 7,063 (180)
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2022
Against all expectations, the presence of a carefully selected normal spermatozoon does not guarantee oocyte activation/fertilization. In contrast, some ICSI cycles will have to face no or low fertilization in several consecutive cycles. Both sperm- and oocyte-derived problems may account for such a dilemma. In case of physiological activation problems,
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Against all expectations, the presence of a carefully selected normal spermatozoon does not guarantee oocyte activation/fertilization. In contrast, some ICSI cycles will have to face no or low fertilization in several consecutive cycles. Both sperm- and oocyte-derived problems may account for such a dilemma. In case of physiological activation problems,
openaire +1 more source
Activation of polyphosphoinositide metabolism at artificial maturation of Patella vulgata oocytes
Developmental Biology, 1992The metabolism of polyphosphoinositides (PPI) has been investigated during the meiosis reinitiation of the oocytes of a prosobranch mollusk, the limpet Patella vulgata. Meiosis reinitiation which leads to germinal vesicle breakdown (GVBD) and metaphase-1 spindle formation was artificially induced by treating the prophase-blocked oocytes with 10 mM ...
B, Borg +3 more
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Zygote, 2011
SummaryThe investigation presented in this paper was conducted on the effect of oocytes activation on frozen–thawed human immature oocytes followed byin vitromaturation (IVM). A total of 386 failed-matured oocytes (germinal vesicle (GV) and metaphase I (MI) stages) was randomly divided into two groups: fresh group and vitrification group, GV group and ...
Y, Liu, Y X, Cao, Z G, Zhang, Q, Xing
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SummaryThe investigation presented in this paper was conducted on the effect of oocytes activation on frozen–thawed human immature oocytes followed byin vitromaturation (IVM). A total of 386 failed-matured oocytes (germinal vesicle (GV) and metaphase I (MI) stages) was randomly divided into two groups: fresh group and vitrification group, GV group and ...
Y, Liu, Y X, Cao, Z G, Zhang, Q, Xing
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Artificial oocyte activation in severe teratozoospermia undergoing intracytoplasmic sperm injection
Fertility and Sterility, 2008To evaluate efficiency of ionomycin on fertilization and cleavage rates, embryo development, and pregnancy rate after intracytoplasmic sperm injection (ICSI) in teratozoospermic patients.Laboratory study.Isfahan fertility and infertility Center, and Royan institute, Tehran, Iran.Eighty-seven couples with male factor etiology (severe teratozoospermia ...
Mohammad Hossein Nasr-Esfahani +2 more
exaly +3 more sources
Conditions for in vitro maturation and artificial activation of ferret oocytes.
Biology of reproduction, 2002The ferret represents an attractive species for animal modeling of lung diseases because of the similarity between ferret and human lung biology and its relatively small size and short gestation time. In an effort to establish experimental protocols necessary for cloning ferrets, optimized conditions for in vitro maturation and artificial activation of
Ziyi, Li +5 more
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Reproductive BioMedicine OnlineIs artificial oocyte activation (AOA) effective for patients with unexplained low or no fertilization following IVF/intracytoplasmic sperm injection (ICSI)?All IVF/ICSI cases resulting in total fertilization failure or fertilization rate ≤25% at Ninewells Assisted Conception Unit, Dundee between January 2014 and December 2021 (n = 231) were reviewed ...
Sarah Martins da Silva
exaly +4 more sources
Reproductive BioMedicine Online, 2012
Following intracytoplasmic sperm injection (ICSI), some patients present low or zero fertilization rates. Artificial oocyte activation has been proposed as a suitable means to overcome this problem. This study applied artificial oocyte activation in patient cohorts with a history of no fertilization (0%, group 1), fertilization between 1 and 29% (group
Markus Montag +2 more
exaly +3 more sources
Following intracytoplasmic sperm injection (ICSI), some patients present low or zero fertilization rates. Artificial oocyte activation has been proposed as a suitable means to overcome this problem. This study applied artificial oocyte activation in patient cohorts with a history of no fertilization (0%, group 1), fertilization between 1 and 29% (group
Markus Montag +2 more
exaly +3 more sources
Effect of culture conditions on artificial activation of porcine oocytes matured in vitro
Reproduction, Fertility and Development, 1996The effects of culture media used and culture period for in vitro maturation of porcine oocytes on their subsequent response to chemical and electrical activation, were investigated. Activated oocytes were identified by the presence of a pronucleus(ei) or cleavage.
N, Yamauchi +3 more
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Artificial Activation of Murine Oocytes Using Strontium to Derive Haploid and Diploid Parthenotes
2022Parthenogenesis is a common reproductive strategy among lower animals that involves the development of an embryo from an oocyte, without any contribution from spermatozoon. This phenomenon does not occur naturally in placental mammals. However, the mammalian oocytes can be artificially activated in vitro using mechanical, electrical, and chemical ...
Daphne Norma, Crasta +3 more
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Respiration of starfish oocytes during meiosis, fertilization, and artificial activation
Experimental Cell Research, 1974Abstract Rates of oxygen consumption were measured in oocytes of the starfish Patiria miniata prior to and after the initiation of meiotic maturation in response to 1-methyladenine. No significant change in the rate of respiration was noted until after the completion of meiosis, at which point a two-fold increase in the rate of respiration was ...
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