منابع مشابه
Meiotic Spindle Structure
Meiotic chromosome segregation leads to the production of haploid germ cells. During meiosis I (MI) the paired homologous chromosomes are separated. Meiosis II (MII) segregation leads to the separation of paired sister chromatids. In the budding yeast, Saccharomyces cerevisiae, both of these divisions take place in a single nucleus, giving rise to the four spored ascus. We have modeled the micr...
متن کاملEffect of dehydroepiandrosterone on meiotic spindle structure and oocyte quality in mice
Objective(s): Dehydroepiandrosterone (DHEA) has been reported to improve pregnancy chances in women with diminished ovarian reserve (DOR) and to reduce miscarriage rates by 50–80%. This study, therefore, assesses effects of DHEA on number of retrieved oocytes and meiotic spindles.Materials and Methods: A randomized, prospective, controlled study was conducted on eight groups, four groups of you...
متن کاملThe Fine Structure of the Meiotic Spindle of the Crayfish
Although the existence of a fibrous orientation within the living spindle can no longer be doubted (3, 6, 7), spindle fibers have been demonstrated with the electron microscope only in a small number of vertebrate tissues (1, 4). Centrioles have previously been investigated in interphasic and dividing cells of vertebrates (1,4) and as basal granules in sperm middle pieces (2, 11). Centromeric r...
متن کاملthe underlying structure of language proficiency and the proficiency level
هدف از انجام این تخقیق بررسی رابطه احتمالی بین سطح مهارت زبان خارجی (foreign language proficiency) و ساختار مهارت زبان خارجی بود. تعداد 314 زبان آموز مونث و مذکر که عمدتا دانشجویان رشته های زبان انگلیسی در سطوح کارشناسی و کارشناسی ارشد بودند در این تحقیق شرکت کردند. از لحاظ سطح مهارت زبان خارجی شرکت کنندگان بسیار با هم متفاوت بودند، (75 نفر سطح پیشرفته، 113 نفر سطح متوسط، 126 سطح مقدماتی). کلا ...
15 صفحه اولThe Influence of Meiotic Spindle Configuration by Cysteamine during in vitro Maturation of Mouse Oocytes
Background: The aim of this study was to assess effects of cysteamine as an anti-oxidant on rate of in vitro maturation of oocyte and determination of its effects on spindle size and shape. Methods: Pre-mature mice were primed with pregnant mare stimulating gonadotrophin (PMSG) and germinal vesicle (GV) stage oocytes were obtained 48 h after. The oocytes were cultured in tissue culture medium (...
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ژورنال
عنوان ژورنال: Journal of Cell Biology
سال: 2007
ISSN: 1540-8140,0021-9525
DOI: 10.1083/jcb.1793rr3