نتایج جستجو برای: fertilization

تعداد نتایج: 33107  

Journal: :cell journal 0

introduction: the aim of this study was to evaluate the effect of sperm protamine deficiency on fertilization and embryo development post icsi. material and methods: semen samples from 27 patients candidate for icsi were assessed for semen parameters. sperm processing was carried out using pure sperm and percentage of protamine deficient sperm was assessed by chromomycin a3 post processing. cor...

2016
Davide Francioli Elke Schulz Guillaume Lentendu Tesfaye Wubet François Buscot Thomas Reitz

Soil management is fundamental to all agricultural systems and fertilization practices have contributed substantially to the impressive increases in food production. Despite the pivotal role of soil microorganisms in agro-ecosystems, we still have a limited understanding of the complex response of the soil microbiota to organic and mineral fertilization in the very long-term. Here, we report th...

Journal: :international journal of reproductive biomedicine 0
seyed m kalnatar ahmad ebrahimi mehrdad solimani hossein fazli

background: the high fertilization failure after ivf treatment cycles could be related to chromosomal abnormalities. this study was carried out to assess the frequency of chromosomal abnormality on human oocytes lacking signs of fertilization 18-20 h after insemination . materials and methods: on day one, 18-20 h after insemination (ivf), fertilization was confirmed when two pronuclei (normal i...

Journal: :iranian journal of applied animal science 2015
s. saha m.a.m.y. khandoker l.y. asad a.m.m.t. reza a. hoque

this study was undertaken to compare the efficiency of fresh and frozen-thawed buck semen on in vitro fertilization (ivf) of goat oocytes. cumulus oocytes complexes (cocs) were collected by aspiration of 2-6 mm diameter follicles, which were obtained from slaughterhouse. upon grading, only normal quality cocs were maturated in tcm-199 for 48 hours. the percentage of cocs reached to the m-ii sta...

Journal: :پژوهش های تولید گیاهی 0

this experiment was carried to find out the effects of foliar fertilization and growing media on some of vegetative and reproductive traits of the new vegetable pepino (solanum muricatum) in a pot culture in outdoor space during five month period in mashhad. foliar fertilization treatments were used in this study including foliar fertilization once every three weeks, once a week and control (no...

Mahdieh N Mansouri Arani M,

s:1858:"Background: Infertility is defined as inability in pregnancy after one year of regular intercourse without using contraceptive methods. Approximately15-10% of couples in childbearing appears infertile. It is the cause of infertility in men and women and infertility treatment depends on type of failure and is one of the methods of treating infertility in vitro fertilization. This researc...

ژورنال: Anatomical Sciences Journal 2006
Mardani, Mohammad, Nasr Esfahani, Mohammad Hosein, Razavi, Shahnaz, Shiri, Reza,

Sperm premature chromosomal condensaion (PCC) and failed oocyte activation are considered to result in failed fertilization post intracytoplasmic sperm injection (ICSI). Recent studies also suggested that sperm protamine deficiency may induce PCC. The ain of this study was to assess the effect of failed oocyte activation and protamine deficiency on failed ferilization post ICSI and to indicate ...

Journal: :Development 1992
B Ciapa B Borg M Whitaker

A transient increase in intracellular free calcium is believed to be the signal responsible for the stimulation of the egg metabolism at fertilization and the resumption of the cell cycle. We have studied how the polyphosphoinositides (PPI) turn over at fertilization in sea urchin eggs, in order to determine the relationship between the metabolism of these lipids and the calcium signal. We comp...

2014
Shun TAKEO Daichi SATO Koji KIMURA Yasunori MONJI Takehito KUWAYAMA Ryoka KAWAHARA-MIKI Hisataka IWATA

The aim of the present study was to address the effect of resveratrol-mediated upregulation of sirtuin 1 (SIRT1) during oocyte maturation on mitochondrial function, the developmental ability of oocytes and on mechanisms responsible for blockage of polyspermic fertilization. Oocytes collected from slaughterhouse-derived ovaries were cultured in TCM-199 medium supplemented with 10% FCS and 0 or 2...

2015
Hee Jung Kang Sun-Hee Lee Yong-Seog Park Chun Kyu Lim Duck Sung Ko Kwang Moon Yang Dong-Wook Park

OBJECTIVE Artificial oocyte activation (AOA) is an effective method to avoid total fertilization failure in human in vitro fertilization-embryo transfer (IVF-ET) cycles. AOA performed using a calcium ionophore can induce calcium oscillation in oocytes and initiate the fertilization process. We evaluated the usefulness of AOA with a calcium ionophore in cases of total fertilization failure in pr...

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