منابع مشابه
The small GTPase Cdc42 promotes membrane protrusion during polar body emission via ARP2-nucleated actin polymerization.
Polar body emission is a specialized cell division throughout the animal kingdom, serving to reduce chromosome ploidy while preserving the egg cytoplasm. Critical to polar body emission are the asymmetric positioning of the meiotic spindle prior to anaphase, with one pole attached to the oocyte cortex, and the simultaneous membrane protrusion during subsequent cytokinesis. We have shown that, d...
متن کاملPolar body emission requires a RhoA contractile ring and Cdc42-mediated membrane protrusion.
Vertebrate oocyte maturation is an extreme form of asymmetric cell division, producing a mature egg alongside a diminutive polar body. Critical to this process is the attachment of one spindle pole to the oocyte cortex prior to anaphase. We report here that asymmetric spindle pole attachment and anaphase initiation are required for localized cortical activation of Cdc42, which in turn defines t...
متن کاملEmission Anisotropy of Fluorescence of Polar Molecules
The emission anisotropy (EA) of 4-Dimethyl-amino-4'nitrostilbene (DNS), 4-Amino-4'-nitrostilbene (ANS) and 2,5-Di(4-biphenylyl)oxazole (BBO) was observed to be decreasing with increasing dielectric constant e of the solvent. The effect is interpreted as an influence of the Onsager reaction field on the volume of the solvent shell, which in the excited state is smaller in solvents with larger e....
متن کاملRadio-Continuum Emission in Polar-Ring Galaxies
We have used the Very Large Array aperture synthesis telescope to conduct a radio continuum survey of polar-ring galaxies, at 20 cm and 6 cm. Forty objects were observed at 20 cm with ≃ 5 resolution. Twenty (50%) of the program sources were detected at 20 cm, down to our 5-σ limit of 0.5 mJy beam−1. This detection rate is similar to those in surveys with comparable sensitivity for early-type ga...
متن کاملOocytes Polar Body Detection for Automatic Enucleation
Enucleation is a crucial step in cloning. In order to achieve automatic blind enucleation, we should detect the polar body of the oocyte automatically. The conventional polar body detection approaches have low success rate or low efficiency. We propose a polar body detection method based on machine learning in this paper. On one hand, the improved Histogram of Oriented Gradient (HOG) algorithm ...
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ژورنال
عنوان ژورنال: Cytoskeleton
سال: 2012
ISSN: 1949-3584
DOI: 10.1002/cm.21041