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  Encyclopedia of Keywords > Nature > Life > Reproduction > Oocyte   Michael Charnine

Keywords and Sections
GERM CELLS
OOCYTES
CENTRIOLES
MEIOTIC
SPERMATOZOA
OOGENESIS
PLASM
CYST
ASTERS
PRIMARY OOCYTES
SPINDLE
MEIOTIC DIVISION
DROSOPHILA
MEIOSIS
CYTOPLASM
MATURATION
EGG
DURING OOGENESIS
FUSION
DIVIDES
MICROTUBULES
Review of Short Phrases and Links

    This Review contains major "Oocyte"- related terms, short phrases and links grouped together in the form of Encyclopedia article.

Definitions

  1. The oocyte was stable for 12 h then underwent blebbing and deterioration. (Web site)
  2. Oocyte: A female germ cell in the process of development. (Web site)
  3. The oocyte is the common reactor that is used to reinstate pluripotency on somatic nuclei.
  4. An oocyte is a large cell having a large nucleus (i.e., the germinal vesicle) surrounded by ooplasm. (Web site)
  5. As used herein, the term "oocyte" refers to a female gamete cell and includes primary oocytes, secondary oocytes and mature, unfertilized ovum. (Web site)

Germ Cells

  1. An oocyte, ovocyte, or rarely o-cyte is a female gametocyte or germ cell involved in reproduction.
  2. Conversely, mis-targeting of oskar RNA to the anterior of the oocyte causes formation of ectopic abdomen and germ cells at the anterior pole. (Web site)
  3. Granulosa cells are in closest proximity to the germ cell and are thought to play an important role in oocyte development and early embryogenesis. (Web site)

Oocytes

  1. Expression of EGFP-Rab27a in ovary, oocyte, and early embryo. (Web site)
  2. Perturbation of oocyte meiotic division by hypergravity in Caenorhabditis elegans .
  3. The female pronucleus is the nucleus of the oocyte or ovum before fusion with the male pronucleus. (Web site)
  4. Regulation of oocyte and granulosa cell functions throughout mammalian oogenesis. (Web site)
  5. An Eph receptor sperm-sensing control mechanism for oocyte meiotic maturation in Caenorhabditis elegans .

Centrioles

  1. The oocyte's centrosomal proteins may exist in a dispersed form due to the lack of centriole and pericentriolar lattice. (Web site)
  2. We suggested that xenogenic centrioles injected to Xenopus laevis oocytes could dissolve after formation of centrioles made from molecules of oocyte origin. (Web site)

Meiotic

  1. Includes penetrated oocyte, ootid, & zygote.
  2. This forms one haploid secondary oocyte and the first polar body.
  3. As the secondary oocyte continues the second meiotic division, it is arrested in metaphase II.
  4. White arrows denote clusters of oocyte chromosomes, and mark the single masses of hypercondensed sperm chromatin. (Web site)
  5. After meiosis I, the haploid oocyte then assembles a second meiotic spindle and arrests at metaphase II, awaiting fertilization. (Web site)

Spermatozoa

  1. Oocyte – the early or primitive ovum (the female reproductive cell). (Web site)
  2. Green, GFP fluorescence; arrow, spermatozoa; Oo, oocyte; Emb, embryo. (Web site)
  3. After maturation, the first ovulated oocyte pushes the spermatids into the spermatheca where they are activated to become spermatozoa. (Web site)

Oogenesis

  1. First, in stages 4–6 of oogenesis, the RNA accumulates in a ring in the posterior cytoplasm of the oocyte. (Web site)
  2. During Drosophila oogenesis, the posterior determinant, Oskar, is tightly localized at the posterior pole of the oocyte. (Web site)

Plasm

  1. Oskar anchoring restricts pole plasm formation to the posterior of the Drosophila oocyte.
  2. At the posterior pole of the Drosophila oocyte, oskar induces a tightly localized assembly of pole plasm. (Web site)
  3. Oocyte surface EGFP fluorescence provides a reliable determinant of ROMK surface expression (Fig. (Web site)
  4. Localization of germ plasm, which specifies the germline (24) , is a very early indicator of oocyte polarity. (Web site)

Cyst

  1. The fusome is instrumental in coordinating mitotic divisions in the cyst, and in oocyte determination in females. (Web site)
  2. In the oocyte, the prophase I arrest is lost, or not properly established, in germline cysts that lack Dacapo.

Asters

  1. Male gametocytes are called spermatocyte s, and female gametocytes are called oocyte s.
  2. Daughter cell receiving almost all of cytoplasm becomes 2-- oocyte.
  3. In the absence of sperm, the oocyte asters participate in the cleavage spindle formation [ 152]. (Web site)
  4. The oocyte is arrested in prophase of meiosis I, which is the stage just before nuclear envelope breakdown. (Web site)
  5. Depletion of Emi1 from frog oocyte extracts prevents them from arresting at metaphase and excess Emi1 arrests oocytes at metaphase. (Web site)

Primary Oocytes

  1. It then divides by mitosis in the ovary into two primary oocyte s.
  2. A primary oocyte is just a kind of initial oocyte that is formed by mitosis of an oogonium into two primary oocytes.
  3. Basally, the same NP houses a small new vitellogenic primary oocyte (NVPO) and an amitotic oogonium (AO); scale bar = 20 µm. (Web site)

Spindle

  1. This enucleated oocyte is then fused with a somatic cell (e.g.
  2. Both meiotic divisions of the mouse oocyte are asymmetric. (Web site)
  3. The egg chambers are oriented as in Figure 1A. N, oocyte nucleus. (Web site)
  4. Such asymmetry is ensured by the positioning of the spindle in the periphery of the large oocyte. (Web site)
  5. An oocyte loses its centrosome, the organelle that acts as a microtubule organizing center, early in gametogenesis. (Web site)

Meiotic Division

  1. A cell from which gametes develop by meiotic division, especially a spermatocyte or an oocyte.
  2. A haploid cell that results from the meiotic division of an oocyte and becomes a female gamete or an ovum.
  3. The collapse of the starfish oocyte nucleus caused by multiphoton wounding was not followed by meiotic divisions. (Web site)
  4. The oocyte-derived pronucleus forms following two rounds of meiotic chromosome segregation, typically in the embryo anterior. (Web site)

Drosophila

  1. In Drosophila, localization of mRNAs in the oocyte determines the axes of the future embryo. (Web site)
  2. Score: 0.504 Encore, a gene required for the regulation of germ line mitosis and oocyte differentiation during Drosophila oogenesis.

Meiosis

  1. The oocyte pronucleus completes meiosis I and II upon fertilization. (Web site)
  2. In Ascaris, the oocyte does not even begin meiosis until the sperm touches it.
  3. These observations also indicate that the oocyte centrosomes lose reproductive capacity between meiosis I and II divisions [ 108]. (Web site)

Cytoplasm

  1. Diffusion of injected fluorescent RNAs in oocyte cytoplasm. (Web site)
  2. Another occasional defect was the presence of disarrayed microtubules in the cytoplasm of the injected oocyte ( Fig. (Web site)

Maturation

  1. SOCE inactivates specifically at the GVBD stage of Xenopus oocyte maturation ( Fig. (Web site)
  2. Encyclopedia Oocyte Diagram showing the reduction in number of the chromosomes in the process of maturation of the ovum.
  3. As in spermiogenesis (but for different reasons), translation of stored transcripts is tightly regulated during oocyte maturation and during embryogenesis. (Web site)

Egg

  1. The method of the present invention may be practiced using unfertilized eggs comprising a pre-maturation oocyte. (Web site)
  2. ICSI of unfertilized human eggs after IVF are used to evaluate the ability of sperm to activate human oocyte. (Web site)
  3. By bypassing the critical events of oocyte penetration, ICSI has proven to be a promising means of producing equine embryos in vitro. (Web site)

During Oogenesis

  1. Each egg begins oogenesis as a primary oocyte.
  2. One mature egg results per 1&186; oocyte enetering oogenesis.
  3. During oogenesis, the polar granules are recruited to the posterior of the oocyte and form the germ plasm (called pole plasm). (Web site)
  4. During oogenesis, the level of tribbles affects the number of germ cell divisions as well as oocyte determination. (Web site)

Fusion

  1. Fertilization involves cell-cell fusion of a sperm with the oocyte. (Web site)
  2. Defects in sperm-oocyte fusion may account for some form of human infertility. (Web site)
  3. This fusion restores the diploid genome, activates the oocyte, and initiates embryonic development. (Web site)
  4. Allen CA, Green DP. The mammalian acrosome reaction: gateway to sperm fusion with the oocyte?. (Web site)

Divides

  1. Each secondary oocyte divides by meiosis into two ootids.
  2. It divides by meiosis into oocyte s, which in turn divide into ova.
  3. Each primary oocyte divides by meiosis into two secondary oocytes.
  4. The oocyte divides in meiosis II into one ootid and the second polar body.

Microtubules

  1. The fusome and microtubules enrich Par-1 in the oocyte, Where it effects polarization in conjunction with Par-3, BicD, Egl, and Dynein.
  2. Mutations in two genes that abrogate oocyte differentiation— egl and Bic-D —also disrupt the organization of microtubules (77) . (Web site)

Categories

  1. Encyclopedia of Keywords > Nature > Life > Reproduction
  2. Encyclopedia of Keywords > Nature > Life > Cells
  3. Glossaries > Glossary of Cell Biology Stubs /
  4. Books about "Oocyte" in Amazon.com

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  Short phrases about "Oocyte"
  Originally created: February 12, 2007.
  Links checked: February 23, 2013.
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