نتایج جستجو برای: zygote morphology
تعداد نتایج: 148549 فیلتر نتایج به سال:
BACKGROUND During the mating pheromone response in budding yeast, activation of a mitogen-activated protein kinase (MAP kinase) cascade results in well-characterized changes in cytoskeletal organization and gene expression. Spatial reorganization of genes within the nucleus has been documented during cell-type differentiation in mammalian cells, but no information was previously available on th...
Anterior-posterior polarity in the Caenorhabditis elegans zygote depends on two groups of PAR proteins, as well as on cortical flow. Recent work now demonstrates that this polarization results from a transition in a bistable reaction-diffusion system of PAR proteins that is triggered by cortical flow.
Volvox sect. Volvox is characterized by having unique morphological characteristics, such as thick cytoplasmic bridges between adult somatic cells in the spheroids and spiny zygote walls. Species of this section are found from various freshwater habitats. Recently, three species of Volvox sect. Volvox originating from rice paddies and a marsh were studied taxonomically based on molecular and mo...
Unexplained infertility is considered when with application of standard investigations, including semen analysis, post coital test, endometrial biopsy, hysterosalpingography, and laparoscopy, etiologic factors are not found. With advances in science and technology and taking advantage of various assessment procedures especially during the last two decades, the prevalence of this entity is decre...
Background: Regulation of gene expression in mammalian embryos is not completely known. Pre-implantation embryos need maternal RNA and proteins synthesized during oogenesis, to regulate development before mater-embryo transition, as the grown oocyte and the 1-cell zygote are transcriptionally silent. There are some oocyte-specific genes called maternal effect genes which may account for this ea...
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