Zygote
Mostrando 1-12 de 158 artigos, teses e dissertações.
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1. Genetic analysis of reciprocal differences in the inheritance of in vitro characters in pearl millet
Abstract Reciprocal differences persist in nature because of the unequal contribution of cytoplasmic determinants from male and female gametes to the zygote. The inheritance of genetic differences is an important factor that influences various traits, including somatic embryogenesis and regeneration in vitro. In this report, we estimate the cytoplasmic and m
Genet. Mol. Biol.. Publicado em: 2016-03
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2. Pronounced segregation of donor mitochondria introduced by bovine Ooplasmic tranfer to the female germ-line.
Ooplasmic transfer (01) has been used in basic mouse research for studying lhe segregation of mtDNA, as well as in human assisted reproduction for improving embryo development in cases of persistent developmental failure. Using cattle as a large-animal model, we demonstrate that lhe moderate amount of mitochondria introduced by OT is transmitted to lhe offsp
Biology of Reproduction. Publicado em: 2011
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3. Karyoplast exchange between strontium- and 6-DMAP-parthenogenetically activated zygotes of cattle.
Ooplasmic factors drive nuclear organization after fertilization and are also important for re-programming in nuclear transfer procedures, in which artificial activation is essential for reconstructed embryos to progress in development. The present research evaluated the effect of pronuclear transfer (PT) between zygotes parthenogenetically activated with io
Animal Reproduction Science. Publicado em: 2011
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4. Influência da depleção e suplementação mitocondrial no processo de apoptose embrionária / Influence of mitochondrial depletion and suplementation in embryonic apoptosis
Studies developed with bovine zygotes submitted to a decrease of about 50% of the mitochondrial content did not present a deleterious effect on in vitro embryonic development. This model was developed by the centrifugation of zygotes after in vitro fertilization (IVF), removal of the mitochondria enriched cytoplast fraction (MECF) and posterior introduction
Publicado em: 2010
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5. Morphological differences in human zygotes and embryos cultured in different media / Efeito de quatro diferentes meios de cultura na qualidade morfologica de zigotos e embriões
Objective: compare the effects of four different culture media on the quality of zygotes and embryos. Methods: This retrospective study, performed at the Center for Human Reproduction of Campinas-Brazil analyzed 2289 embryos were assessed from September 2006 to September 2008. Long protocol was used for ovarian stimulation in all cases. The oocytes of each p
Publicado em: 2009
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6. Ativação de genes apoptóticos no bloqueio do desenvolvimento em embriões bovinos / Activation of apoptotic genes at developmental block in bovine embryo development
Maternal-zygotic transition is a complex phenomenon characterized by the initiation of transcription in the embryo and the transition of maternal mRNA with embryonic mRNA. It is believed that the mRNAs and proteins synthethized by the oocyte during its growth and final maturation allow the zygote to develop during the early stages of embryo development up to
Publicado em: 2009
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7. El conflicto mujer-embrión en debate parlamentario sobre el aborto
This article analyzes the woman-embryo conflict discussed by the Uruguayan Senate during the debates on abortion legalization in October and November 2007. Its aim is to show the underlying notions, which are classified as those that promote the 'patrimonial control over the body' and those that promote autonomy. From that perspective, it analyzes the abstra
Revista Estudos Feministas. Publicado em: 2008-08
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8. Acid phosphatase from the microalgae Selenastrum capricornutum : extraction, characterization and effect of agriculture pollutants / Fosfatase acida da microalga Selenastrum capricornutum : extração, caracterização e efeito de poluentes de origem agricola
Selenastrum capricornutum is an unicellular green algae widely distributed in freshwater and soils among the world. Because this cosmopolitan characteristic its use is recommended by national and international protocols in ecotoxicity studies. Algae acid phosphatase plays important roles in the metabolism such as decomposing organic phosphates into free phos
Publicado em: 2005
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9. O genero Dahlstedtia Malme : embriologia, sistema reprodutivo e biossistematica
Flowers, fruits and seed abortion was studied in two Brazilian species: Dahlstedtia pinnata e D. pentaphy/la (Leguminosae, Papilionoideae). Such a study was developed through investigations of: 1. floral development, microsporogenesis, ovule and early seed development following open, self- and cross-pollination, in order to compare the results to other papil
Publicado em: 2001
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10. Ectopic expression of a Chlamydomonas mt+-specific homeodomain protein in mt− gametes initiates zygote development without gamete fusion
The molecular mechanisms that activate expression of zygote genes after fertilization are obscure. In animals, receptor-ligand interactions during sperm–egg membrane fusion as well as delivery of putative regulatory molecules by the sperm into the egg cytoplasm are proposed to activate zygote development and subsequent transcription of zygote genes. The me
Cold Spring Harbor Laboratory Press.
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11. Molecular characterization of a zygote wall protein: an extensin-like molecule in Chlamydomonas reinhardtii.
The green alga Chlamydomonas reinhardtii elaborates two biochemically and morphologically distinct cell walls during its life cycle: one surrounds the vegetative and gametic cell and the other encompasses the zygote. Hydroxyproline-rich glycoproteins (HRGPs) constitute a major component of both walls. We describe the isolation and characterization of a zygot
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12. Complementation and Preliminary Linkage Analysis of Zygote Maturation Mutants of the Homothallic Alga, CHLAMYDOMONAS MONOICA
Sexual reproduction in Chlamydomonas monoica is homothallic: pair formation and cell fusion occur in clonal culture and give rise to a heavily walled diploid zygospore. During maturation of the young zygote, a distinctive "primary zygote wall" is released before the development of the highly reticulate zygospore wall. Using ethyl methanesulfonate and ultravi