نتایج جستجو برای: fertilisation
تعداد نتایج: 2515 فیلتر نتایج به سال:
OBJECTIVES To compare the effectiveness of in vitro fertilisation with single embryo transfer or in vitro fertilisation in a modified natural cycle with that of intrauterine insemination with controlled ovarian hyperstimulation in terms of a healthy child. DESIGN Multicentre, open label, three arm, parallel group, randomised controlled non-inferiority trial. SETTING 17 centres in the Nether...
Sperm concentration and sperm ageing effects on fertilisation success were evaluated in the laboratory in the free-spawning Antarctic soft-shelled clam Laternula elliptica and Antarctic limpet Nacella concinna. Fertilisation success was highly dependent on sperm concentration. Highest levels of fertilisation success were consistently replicated at ~107 sperm ml–1 for L. elliptica, and ~106 to 1...
The mitochondrion is explicitly involved in cytoplasmic regulation and is the cell's major generator of ATP. Our aim was to determine whether mitochondria alone could influence fertilisation outcome. In vitro, oocyte competence can be assessed through the presence of glucose-6-phosphate dehydrogenase (G6PD) as indicated by the dye, brilliant cresyl blue (BCB). Using porcine in vitro fertilisati...
AIM Human in vitro fertilisation (IVF) and gamete intrafallopian transfer have been used in the management of various forms of infertility. In cases of severe male-factor infertility, fertilisation can be a factor. In this study micromanipulation was used to increase fertilisation in such cases. METHODS Two micromanipulation techniques, subzonal sperm injection (SUZI) and partial zona dissect...
We have investigated the relationship between the sperm-triggered Ca2+ oscillations and the activities of two cell cycle kinases (MPF activity and MAP kinase activity) at fertilisation of Ascidiella aspersa oocytes. Maturation Promoting Factor (MPF) activity is elevated in the metaphase I (MI)-arrested unfertilised oocyte (as measured by phosphorylation of exogenous histone H1) and falls 5 minu...
At fertilisation, Ca(2+) signals activate embryonic development by stimulating metabolism, exocytosis and endocytosis, cytoskeletal remodelling, meiotic resumption and recruitment of maternal RNAs. Mitochondria present in large number in eggs have long been thought to act as a relay in Ca(2+) signalling at fertilisation. However, only recently have studies on ascidians and mouse proven that spe...
Acacia koa forests benefit from phosphorus fertilisation, but it is unknown if fertilisation is a short or long term effect on P availability. Past research suggests that P cycling in soils with high P sorption capacity, such as Andisols, was through organic pathways.We studied leaf P and soil P fractions in a tropical forest Andisol for 3 years after fertilisation with triple super phosphate. ...
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