Sex Inversion
Mostrando 1-12 de 27 artigos, teses e dissertações.
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1. Perfil dos esteroides gonadais e expressão dos hormônios folículo estimulante (FSH) e luteinizante (LH) durante a inversão sexual de Epinephelus marginatus (Teleostei: Serranidae), hermafrodita protogínico, utilizando-se inibidor de aromatase / Gonadal steroids profile and expression of follicle-stimulating (FSH) and luteinizing (LH) hormones during the sex reversal of Epinephelus marginatus (Teleostei: Serranidae) hermaphroditic protogynous, using aromatase inhibitor
A plasticidade do desenvolvimento gonadal em peixes, que contrasta com os padrões mais estáveis encontrados nos demais vertebrados, deu origem a várias questões intrigantes relativas tanto ao seu significado adaptativo quanto aos fatores genéticos e fisiológicos que modulam o processo. A inversão do sexo em peixes hermafroditas seqüenciais (protândr
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/08/2012
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2. Sex chromosome system ZZ/ZW in Apareiodon hasemani Eigenmann, 1916 (Characiformes, Parodontidae) and a derived chromosomal region
Parodontidae fish show few morphological characteristics for the identification of their representatives and chromosomal analyses have provided reliable features for determining the interrelationships in this family. In this study, the chromosomes of Apareiodon hasemani from the São Francisco River basin, Brazil, were analyzed and showed a karyotype with 2n
Genet. Mol. Biol.. Publicado em: 13/11/2012
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3. Produção de populações monossexo macho de tilápia-do-nilo da linhagem Chitralada.
A fim de avaliar o efeito da alta temperatura na proporção de sexos da tilápia-do-nilo (Oreochromis niloticus) da linhagem Chitralada, foram conduzidos dois experimentos. No primeiro foram analisados, por 28 dias, os efeitos da temperatura de 35ºC, em relação ao controle (27ºC), iniciando-se dez dias após a eclosão. Foi encontrada diferença signifi
Pesquisa Agropecuária Brasileira. Publicado em: 2011
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4. Cytogenetics studies in Brazilian species of Pseudophyllinae (Orthoptera: Tettigoniidae): 2n(♂)=35 and fn=35 the probable basic and ancestral karyotype of the family tettigoniidae
The karyotypes of five species of Brazilian Pseudophyllinae belonging to four tribes were here studied. The data available in the literature altogether with those obtained with species in here studied allowed us to infer that 2n(♂)=35 is the highest chromosome number found in the family Tettigoniidae and that it is present in species belonging to Pseudophy
Neotropical Entomology. Publicado em: 2010-08
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5. Chromosomal location of 18S and 5S rDNA sites in Triportheus fish species (Characiformes, Characidae)
The location of 18S and 5S rDNA sites was determined in eight species and populations of the fish genus Triportheus by using fluorescent in situ hybridization (FISH). The males and females of all species had 2n = 52 chromosomes and a ZZ/ZW sex chromosome system. A single 18S rDNA site that was roughly equivalent to an Ag-NOR was detected on the short arms of
Genetics and Molecular Biology. Publicado em: 23/01/2009
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6. Estudos de citogenética e de filogenia molecular em roedores da tribo Akodontini / Cytogenetics and molecular phylogenetics in rodents of the tribe Akodontini
Traditionally comparative cytogenetic studies are based mainly on banding patterns. Nevertheless, when dealing with species with highly rearranged genomes, as in Akodon species, or with other highly divergent species, cytogenetic comparisons of banding patterns prove to be inadequate. Hence, comparative chromosome painting has become the method of choice for
Publicado em: 2009
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7. Levels of 17-methyltestosterone in different temperatures on sex inversion of Nile tilapias Oreochromis niloticus. / NÃveis de 17-α metiltestosterona em diferentes temperaturas na inversÃo sexual de tilÃpias- Oreochronis niloticus
Due to sexual precocity and higher growth rate of Nile tilapia males in relation to females, several techniques on sex inversion, more specifically the masculinization or production of mono-sex populations, have been praised. Among the techniques used for sex inversion in tilapias, the most disseminated around the world and Brazil is the hormone usage incorp
Publicado em: 2007
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8. Molecular systematics and wing morphometric variation in species of the Drosophila tripunctata radiation / Sistematica molecular e variação morfometrica da asa de especies de Drosophila da radiação tripunctata
The tripunctata group is the second largest Neotropical group of Drosophila in number of species and was included in the tripunctata radiation which comprises other closely related groups. The second chromosome of Drosophila mediopunctata (a species that belongs to the tripunctata group) is highly polymorphic for inversions. Previous work suggested the pr
Publicado em: 2007
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9. Cytogenetic study of species of the genero Pseudis and Lysapsus (Anura, Hylidae, Hylinae) / Estudo citogenetico de especies dos generos Pseudis e Lysapsus (Anura, Hylidae, Hylinae)
The taxonomic position, phylogenetic relationships, synonymization of species considered to be distinct, existence of subspecies, and the proposals of intrageneric groups of the genera Pseudis and Lysapsus have always been a matter of discussion among herpetologists. The genera Pseudis and Lysapsus have already been included in the family Pseudidae and also
Publicado em: 2005
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10. Sintese quimioenzimatica de (-)- serricornina e (+)- sitofilure
Chiral alcohols are versatile and convenient building blocks in the synthesis of biologically important compounds. Asymmetric reduction of b-keto esters by Baker s yeast (S. cerevisiae) has been widely used to obtain chiral alcohols because of simplicity, cheapness and enantioselectivity. However, the optical purities and the yields of these compounds are of
Publicado em: 1997
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11. Ectodermal dysplasia in females and inversion of chromosome 9.
Absence of sweat glands, hypotrichosis, hypodontia, characteristic facial features, and intolerance to heat, without dystrophia of the nails, are manifestations of sex linked hypohydrotic ectodermal dysplasia. Three males and two females were affected in a family in which the affected females were also carrying a pericentric inversion of chromosome 9. Those
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12. Inversion of Transfer Modes and Sex Factor-Chromosome Interactions in Conjugation in Escherichia coli
A study was made of the mating properties of an unusual system of interconvertible donor strains of Escherichia coli K-12: Ra-1, Ra-2, and RaF+. The Ra-1 and Ra-2 strains are Hfr strains whose origins are widely separated on the chromosome and whose transfer modes proceed in the opposite direction from one another. When Ra-1 cells were mated with females, a