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  1 / 218 MEDLINE  
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[PMID]:28437173
[Au] Autor:Batista JA; Cardoso AL; Milhomem-Paixão SSR; Ready JS; Pieczarka JC; Nagamachi CY
[Ad] Endereço:1 Laboratório de Citogenética , Centro de Estudos Avançados da Biodiversidade, Instituto de Ciências Biológicas, Universidade Federal do Pará, Belém, Brazil .
[Ti] Título:The Karyotype of Microsternarchus aff. bilineatus: A First Case of Y Chromosome Degeneration in Gymnotiformes.
[So] Source:Zebrafish;14(3):244-250, 2017 Jun.
[Is] ISSN:1557-8542
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Various species and lineages that until recently were identified as Microsternarchus bilineatus (Hypopomidae, Gymnotiformes) have a widespread distribution in the Amazon and Orinoco River basins and across the Guiana shield. Recent molecular studies show five distinct lineages for Microsternarchus from different localities. These results suggest that this previously monotypic genus actually consists of more than one species. Here, we describe the karyotype of M. aff. bilineatus from the Cururutuia River (Bragança, Pará, Brazil). The diploid number of 48 chromosomes (14 meta-submetacentric/34 subtelo-acrocentric) is found for males and females, with an XX/XY sex chromosome system. The nucleolar organizer region is found in the short arm of pair 9. Constitutive heterochromatin occurs in the pericentromeric region of all chromosomes, in the distal region of 3p, 5p, 7p, 8q, 9q, 16q, and Xq, in the interstitial region in 2p, 10q, 11q, and 12q and all along 4p, and in a large block of the Y chromosome. These results indicate extensive karyotype divergence between this population and samples from Igarapé Tarumã Grande (Negro River, Amazonas, Brazil) studied by other researchers. Moreover, despite the diversity of sex chromosome systems found in Gymnotiformes, the XX/XY sex chromosome system of M. aff. bilineatus is the first case of Y chromosome degeneration in this order. The present data are valuable to help understand karyotype evolution in Hypopomidae.
[Mh] Termos MeSH primário: Evolução Biológica
Gimnotiformes/genética
Cromossomo Y/metabolismo
[Mh] Termos MeSH secundário: Animais
Feminino
Cariótipo
Cariotipagem/métodos
Cariotipagem/veterinária
Masculino
Filogenia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1711
[Cu] Atualização por classe:171102
[Lr] Data última revisão:
171102
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170425
[St] Status:MEDLINE
[do] DOI:10.1089/zeb.2016.1383


  2 / 218 MEDLINE  
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[PMID]:28394248
[Au] Autor:Suárez P; Pinto Barroso ICG; Silva DDS; Milhomem SSR; Cabral-de-Mello DC; Martins C; Pieczarka JC; Nagamachi CY
[Ad] Endereço:1 Laboratório de Citogenética, Centro de Estudos Avançados da Biodiversidade, Instituto de Ciências Biológicas, Universidade Federal do Pará , Belém, Brazil .
[Ti] Título:Highest Diploid Number Among Gymnotiformes: First Cytogenetic Insights into Rhabdolichops (Sternopygidae).
[So] Source:Zebrafish;14(3):272-279, 2017 Jun.
[Is] ISSN:1557-8542
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:We report the first comparative cytogenetic analysis of two species from electrogenic fish of genus Rhabdolichops (Sternopygidae, Gymnotiformes): Rhabdolichops troscheli and Rhabdolichops cf eastwardi. R. troscheli has 2n = 54 (fundamental number [FN] = 66), whereas R. cf. eastwardi has 2n = 74 (FN = 78). C-banding revealed centromeric constitutive heterochromatin in both species. Ag-NORs mapped on pair 6 in R. troscheli and pair 30 in R. cf eastwardi. Fluorescense in situ hybridization with 18S rDNA probes confirmed the Ag-NOR staining results and revealed additional (presumably silent) ribosomal genes on pairs 12, 13, 21, 23, 26, and 27 in R. cf eastwardi. 5S rDNA was found on the centromeres of pair 7 in both species. Telomeric probes showed only distal locations. Dispersed signal patterns were obtained using probes for retrotransposons Rex1 and Rex3. Histone H1 and H3 genes were found together on pair 6 in R. cf eastwardi. The high diploid number found in Rhabdolichops suggests that chromosome fission may have contributed to its chromosomal evolution, phylogenetic relationship of the Sternopygidae suggests that this increase in diploid number could be a synapomorphic characteristic of genus Rhabdolichops. Although both species are phylogenetically close related, their karyotype structure has undergone divergent evolutionary directions. All in all, our results strongly suggest that R. cf eastwardi experencied recent intense genome reorganization.
[Mh] Termos MeSH primário: Análise Citogenética/métodos
Diploide
Gimnotiformes/genética
[Mh] Termos MeSH secundário: Animais
Evolução Biológica
Gimnotiformes/classificação
Heterocromatina
Hibridização in Situ Fluorescente/métodos
Cariotipagem/veterinária
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Heterochromatin)
[Em] Mês de entrada:1711
[Cu] Atualização por classe:171102
[Lr] Data última revisão:
171102
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170411
[St] Status:MEDLINE
[do] DOI:10.1089/zeb.2016.1405


  3 / 218 MEDLINE  
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[PMID]:28190119
[Au] Autor:Kawasaki M; Leonard J
[Ad] Endereço:Department of Biology, University of Virginia, Charlottesville, VA, 22904, USA. mk3u@virginia.edu.
[Ti] Título:Phase-locking behavior in a high-frequency gymnotiform weakly electric fish, Adontosternarchus.
[So] Source:J Comp Physiol A Neuroethol Sens Neural Behav Physiol;203(2):151-162, 2017 Feb.
[Is] ISSN:1432-1351
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:An apteronotid weakly electric fish, Adontosternarchus, emits high-frequency electric organ discharges (700-1500 Hz) which are stable in frequency if no other fish or artificial signals are present. When encountered with an artificial signal of higher frequency than the fish's discharge, the fish raised its discharge frequency and eventually matched its own frequency to that of the artificial signal. At this moment, phase locking was observed, where the timing of the fish's discharge was precisely stabilized at a particular phase of the artificial signal over a long period of time (up to minutes) with microsecond precision. Analyses of the phase-locking behaviors revealed that the phase values of the artificial stimulus at which the fish stabilizes the phase of its own discharge (called lock-in phases) have three populations between -180° and +180°. During the frequency rise and the phase-locking behavior, the electrosensory system is exposed to the mixture of feedback signals from its electric organ discharges and the artificial signal. Since the signal mixture modulates in both amplitude and phase, we explored whether amplitude or phase information participated in driving the phase-locking behavior, using a numerical model. The model which incorporates only amplitude information well predicted the three populations of lock-in phases. When phase information was removed from the electrosensory stimulus, phase-locking behavior was still observed. These results suggest that phase-locking behavior of Adontosternarchus requires amplitude information but not phase information available in the electrosensory stimulus.
[Mh] Termos MeSH primário: Comportamento Animal/fisiologia
Órgão Elétrico/fisiologia
Gimnotiformes/fisiologia
[Mh] Termos MeSH secundário: Animais
Peixe Elétrico
Estimulação Elétrica/métodos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171014
[Lr] Data última revisão:
171014
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170213
[St] Status:MEDLINE
[do] DOI:10.1007/s00359-017-1148-x


  4 / 218 MEDLINE  
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[PMID]:28183135
[Au] Autor:Campos-DA-Paz R; Queiroz IR
[Ad] Endereço:Laboratório de Ictiologia Neotropical, Departamento de Ecologia e Recursos Marinhos, Instituto de Biociências, Avenida Pasteur 458/sala 408, Universidade Federal do Estado do Rio de Janeiro, 22290-240, Rio de Janeiro, RJ, Brazil.. rcpaz@unirio.br.
[Ti] Título:A new species of Eigenmannia Jordan and Evermann (Gymnotiformes: Sternopygidae) from the upper rio Paraguai basin.
[So] Source:Zootaxa;4216(1):zootaxa.4216.1.5, 2017 Jan 03.
[Is] ISSN:1175-5334
[Cp] País de publicação:New Zealand
[La] Idioma:eng
[Ab] Resumo:Eigenmannia correntes, a new species belonging to the Eigenmannia trilineata species-group, is described from tributaries of rio Correntes, a major affluent of the rio Piquiri system, upper rio Paraguai basin (Mato Grosso and Mato Grosso do Sul states, Brazil). Eigenmannia correntes is included in the currently poorly defined sternopygid genus Eigenmannia (Ostariophysi: Gymnotiformes) by presenting characters that are either primitive or of uncertain polarity, such as eyes covered by skin, scales present over entire postcranial portion of body, teeth absent from oral valve, infraorbital bones 1+2 with enlarged posterodorsal expansion, and gill rakers short and unossified. The new species is distinguished from all congeners, except those species included in the Eigenmannia trilineata species-group, by the presence of a conspicuous superior midlateral stripe (synapomorphy of this clade). Eigenmannia correntes can be differentiated from all members of the Eigenmannia trilineata species-group, except E. vicentespelaea, E. waiwai and E. besouro, by its subterminal mouth (vs. terminal in remaining species of that group). Further, it differs from these aforementioned species by a number of meristic and morphometric characters, including number of premaxillary and dentary teeth, number of longitudinal series of scales above lateral line, number of pectoral-fin and anal-fin rays, eye diameter, postorbital distance, and snout length. Finally, notes on reproduction and parasitism for E. correntes are presented.
[Mh] Termos MeSH primário: Gimnotiformes/classificação
[Mh] Termos MeSH secundário: Distribuição Animal
Estruturas Animais/anatomia & histologia
Estruturas Animais/crescimento & desenvolvimento
Animais
Tamanho Corporal
Brasil
Feminino
Gimnotiformes/anatomia & histologia
Gimnotiformes/crescimento & desenvolvimento
Masculino
Tamanho do Órgão
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1705
[Cu] Atualização por classe:170508
[Lr] Data última revisão:
170508
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170210
[St] Status:MEDLINE
[do] DOI:10.11646/zootaxa.4216.1.5


  5 / 218 MEDLINE  
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Venere, Paulo Cesar
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[PMID]:28151699
[Au] Autor:de Sousa TP; Marques DK; Vitorino CA; Faria KC; Braga GD; Ferreira DC; Venere PC
[Ad] Endereço:1 Programa de Pós-graduação em Ecologia e Conservação, Universidade do Estado de Mato Grosso, Nova Xavantina, MT, Brazil .
[Ti] Título:Cytogenetic and Molecular Data Support the Occurrence of Three Gymnotus Species (Gymnotiformes: Gymnotidae) Used as Live Bait in Corumbá, Brazil: Implications for Conservation and Management of Professional Fishing.
[So] Source:Zebrafish;14(2):177-186, 2017 Apr.
[Is] ISSN:1557-8542
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:In the Pantanal of Mato Grosso do Sul, electric fish (Gymnotus spp.) are the primary source of live bait, accounting for more than three-quarters of total sales. Based on chromosomal and molecular markers, the present study attempted to identify the Gymnotus species used as bait in the region of Corumbá, Mato Grosso do Sul, Brazil. Three species were detected, based on their distinct karyotypes: G. paraguensis (2n = 54), G. sylvius (2n = 40), and G. pantanal (2n = 39-40, X X Y/X X X X ), with no evidence being found of interspecific hybrids. All three species presented a single nucleolar organizer regions (NOR) (heterochromatin CMA /DAPI ) and pericentromeric heterochromatin in almost all chromosomes, with a few distal and/or interstitial blocks. G. sylvius and G. pantanal had one and two pairs of chromosomes with 5S rDNA sites, respectively, while G. paraguensis had 17 chromosome pairs with these markers. The three species formed well-defined clusters in the DNA barcoding analysis. The integrated analysis of the cytogenetic and DNA barcoding data confirmed that the diversity of Gymnotus species exploited as live bait in the study region has been underestimated. These findings indicate that the markers analyzed represent valuable tools for the conservation and fishery management of the Gymnotus stocks exploited.
[Mh] Termos MeSH primário: Conservação dos Recursos Naturais
Pesqueiros
Gimnotiformes/genética
[Mh] Termos MeSH secundário: Animais
Brasil
Variação Genética
Cariótipo
Especificidade da Espécie
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171016
[Lr] Data última revisão:
171016
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170203
[St] Status:MEDLINE
[do] DOI:10.1089/zeb.2016.1356


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[PMID]:27844054
[Au] Autor:Fotowat H; Harvey-Girard E; Cheer JF; Krahe R; Maler L
[Ad] Endereço:Department of Cellular and Molecular Medicine, University of Ottawa , Ottawa, Ontario K1H 8M5, Canada.
[Ti] Título:Subsecond Sensory Modulation of Serotonin Levels in a Primary Sensory Area and Its Relation to Ongoing Communication Behavior in a Weakly Electric Fish.
[So] Source:eNeuro;3(5), 2016 Sep-Oct.
[Is] ISSN:2373-2822
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Serotonergic neurons of the raphe nuclei of vertebrates project to most regions of the brain and are known to significantly affect sensory processing. The subsecond dynamics of sensory modulation of serotonin levels and its relation to behavior, however, remain unknown. We used fast-scan cyclic voltammetry to measure serotonin release in the electrosensory system of weakly electric fish, . These fish use an electric organ to generate a quasi-sinusoidal electric field for communicating with conspecifics. In response to conspecific signals, they frequently produce signal modulations called chirps. We measured changes in serotonin concentration in the hindbrain electrosensory lobe (ELL) with a resolution of 0.1 s concurrently with chirping behavior evoked by mimics of conspecific electric signals. We show that serotonin release can occur phase locked to stimulus onset as well as spontaneously in the ELL region responsible for processing these signals. Intense auditory stimuli, on the other hand, do not modulate serotonin levels in this region, suggesting modality specificity. We found no significant correlation between serotonin release and chirp production on a trial-by-trial basis. However, on average, in the trials where the fish chirped, there was a reduction in serotonin release in response to stimuli mimicking similar-sized same-sex conspecifics. We hypothesize that the serotonergic system is part of an intricate sensory-motor loop: serotonin release in a sensory area is triggered by sensory input, giving rise to motor output, which can in turn affect serotonin release at the timescale of the ongoing sensory experience and in a context-dependent manner.
[Mh] Termos MeSH primário: Comunicação Animal
Gimnotiformes/metabolismo
Atividade Motora/fisiologia
Percepção/fisiologia
Rombencéfalo/metabolismo
Serotonina/metabolismo
[Mh] Termos MeSH secundário: Estimulação Acústica
Animais
Estimulação Elétrica
Masculino
Fatores de Tempo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
333DO1RDJY (Serotonin)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171031
[Lr] Data última revisão:
171031
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161116
[St] Status:MEDLINE


  7 / 218 MEDLINE  
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[PMID]:27820927
[Au] Autor:Liu DW; Lu Y; Yan HY; Zakon HH
[Ad] Endereço:Marine Research Station, Academia Sinica, Jiaoshi Township, Taiwan.
[Ti] Título:South American Weakly Electric Fish (Gymnotiformes) Are Long-Wavelength-Sensitive Cone Monochromats.
[So] Source:Brain Behav Evol;88(3-4):204-212, 2016.
[Is] ISSN:1421-9743
[Cp] País de publicação:Switzerland
[La] Idioma:eng
[Ab] Resumo:Losses of cone opsin genes are noted in animals that are nocturnal or rely on senses other than vision. We investigated the cone opsin repertoire of night-active South American weakly electric fish. We obtained opsin gene sequences from genomic DNA of 3 gymnotiforms (Eigenmannia virescens, Sternopygus macrurus, Apteronotus albifrons) and the assembled genome of the electric eel (Electrophorus electricus). We identified genes for long-wavelength-sensitive (LWS) and medium-wavelength-sensitive cone opsins (RH2) and rod opsins (RH1). Neither of the 2 short-wavelength-sensitive cone opsin genes were found and are presumed lost. The fact that Electrophorus has a complete repertoire of extraretinal opsin genes and conservation of synteny with the zebrafish (Danio rerio) for genes flanking the 2 short-wavelength-sensitive opsin genes supports the supposition of gene loss. With microspectrophotometry and electroretinograms we observed absorption spectra consistent with RH1 and LWS but not RH2 opsins in the retinal photoreceptors of E. virescens. This profile of opsin genes and their retinal expression is identical to the gymnotiform's sister group, the catfish, which are also nocturnally active and bear ampullary electroreceptors, suggesting that this pattern likely occurred in the common ancestor of gymnotiforms and catfish. Finally, we noted an unusual N-terminal motif lacking a conserved glycosylation consensus site in the RH2 opsin of gymnotiforms, a catfish and a characin (Astyanax mexicanus). Mutations at this site influence rhodopsin trafficking in mammalian photoreceptors and cause retinitis pigmentosa. We speculate that this unusual N terminus may be related to the absence of the RH2 opsin in the cones of gymnotiforms and catfish.
[Mh] Termos MeSH primário: Opsinas dos Cones/genética
Expressão Gênica/fisiologia
Gimnotiformes/fisiologia
Células Fotorreceptoras Retinianas Cones/fisiologia
[Mh] Termos MeSH secundário: Animais
Electrophorus/genética
Electrophorus/fisiologia
Eletrorretinografia
Expressão Gênica/genética
Genoma
Gimnotiformes/genética
Microespectrofotometria
América do Sul
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Cone Opsins)
[Em] Mês de entrada:1707
[Cu] Atualização por classe:170719
[Lr] Data última revisão:
170719
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161108
[St] Status:MEDLINE
[do] DOI:10.1159/000450746


  8 / 218 MEDLINE  
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[PMID]:27750255
[Au] Autor:da Silva M; Barbosa P; Artoni RF; Feldberg E
[Ad] Endereço:Programa de Pós Graduação em Genética, Conservação e Biologia Evolutiva, Instituto Nacional de Pesquisas da Amazônia, Manaus, Brazil.
[Ti] Título:Evolutionary Dynamics of 5S rDNA and Recurrent Association of Transposable Elements in Electric Fish of the Family Gymnotidae (Gymnotiformes): The Case of Gymnotus mamiraua.
[So] Source:Cytogenet Genome Res;149(4):297-303, 2016.
[Is] ISSN:1424-859X
[Cp] País de publicação:Switzerland
[La] Idioma:eng
[Ab] Resumo:Gymnotidae is a family of electric fish endemic to the Neotropics consisting of 2 genera: Electrophorus and Gymnotus. The genus Gymnotus is widely distributed and is found in all of the major Brazilian river systems. Physical and molecular mapping data for the ribosomal DNA (rDNA) in this genus are still scarce, with its chromosomal location known in only 11 species. As other species of Gymnotus with 2n = 54 chromosomes from the Paraná-Paraguay basin, G. mamiraua was found to have a large number of 5S rDNA sites. Isolation and cloning of the 5S rDNA sequences from G. mamiraua identified a fragment of a transposable element similar to the Tc1/mariner transposon associated with a non-transcribed spacer. Double fluorescence in situ hybridization analysis of this element and the 5S rDNA showed that they were colocalized on several chromosomes, in addition to acting as nonsyntenic markers on others. Our data show the association between these sequences and suggest that the Tc1 retrotransposon may be the agent that drives the spread of these 5S rDNA-like sequences in the G. mamiraua genome.
[Mh] Termos MeSH primário: DNA Ribossômico/genética
Evolução Molecular
Gimnotiformes/genética
RNA Ribossômico 5S/genética
Retroelementos/genética
[Mh] Termos MeSH secundário: Animais
Mapeamento Cromossômico
Feminino
Genoma/genética
Hibridização in Situ Fluorescente
Masculino
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (DNA, Ribosomal); 0 (RNA, Ribosomal, 5S); 0 (Retroelements)
[Em] Mês de entrada:1701
[Cu] Atualização por classe:170116
[Lr] Data última revisão:
170116
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161018
[St] Status:MEDLINE


  9 / 218 MEDLINE  
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[PMID]:27736882
[Au] Autor:Crampton WG; de Santana CD; Waddell JC; Lovejoy NR
[Ad] Endereço:Department of Biology, University of Central Florida, Orlando, Florida, 32816-2368, United States of America.
[Ti] Título:Phylogenetic Systematics, Biogeography, and Ecology of the Electric Fish Genus Brachyhypopomus (Ostariophysi: Gymnotiformes).
[So] Source:PLoS One;11(10):e0161680, 2016.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:A species-level phylogenetic reconstruction of the Neotropical bluntnose knifefish genus Brachyhypopomus (Gymnotiformes, Hypopomidae) is presented, based on 60 morphological characters, approximately 1100 base pairs of the mitochondrial cytb gene, and approximately 1000 base pairs of the nuclear rag2 gene. The phylogeny includes 28 species of Brachyhypopomus and nine outgroup species from nine other gymnotiform genera, including seven in the superfamily Rhamphichthyoidea (Hypopomidae and Rhamphichthyidae). Parsimony and Bayesian total evidence phylogenetic analyses confirm the monophyly of the genus, and identify nine robust species groups. Homoplastic osteological characters associated with diminutive body size and occurrence in small stream habitats, including loss of squamation and simplifications of the skeleton, appear to mislead a phylogenetic analysis based on morphological characters alone-resulting in the incorrect placing of Microsternarchus + Racenisia in a position deeply nested within Brachyhypopomus. Consideration of geographical distribution in light of the total evidence phylogeny indicates an origin for Brachyhypopomus in Greater Amazonia (the superbasin comprising the Amazon, Orinoco and major Guiana drainages), with subsequent dispersal and vicariance in peripheral basins, including the La Plata, the São Francisco, and trans-Andean basins of northwest South America and Central America. The ancestral habitat of Brachyhypopomus likely resembled the normoxic, low-conductivity terra firme stream system occupied by many extant species, and the genus has subsequently occupied a wide range of terra firme and floodplain habitats including low- and high-conductivity systems, and normoxic and hypoxic systems. Adaptations for impedance matching to high conductivity, and/or for air breathing in hypoxic systems have attended these habitat transitions. Several species of Brachyhypopomus are eurytopic with respect to habitat occupancy and these generally exhibit wider geographical ranges than stenotopic species.
[Mh] Termos MeSH primário: Gimnotiformes/anatomia & histologia
Gimnotiformes/genética
Filogenia
[Mh] Termos MeSH secundário: Animais
Teorema de Bayes
América Central
Evolução Molecular
Especiação Genética
Gimnotiformes/classificação
Filogeografia
Análise de Sequência de DNA
América do Sul
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1705
[Cu] Atualização por classe:170519
[Lr] Data última revisão:
170519
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161014
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0161680


  10 / 218 MEDLINE  
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[PMID]:27454711
[Au] Autor:de Jesus IS; Ferreira M; Garcia C; Ribeiro LB; Alves-Gomes JA; Feldberg E
[Ad] Endereço:1 Laboratório de Fisiologia Comportamental e Evolução, Coordenação de Biodiversidade, Instituto Nacional de Pesquisas da Amazônia-INPA , Manaus, Brazil .
[Ti] Título:First Cytogenetic Description of Microsternarchus bilineatus (Gymnotiformes: Hypopomidae) from Negro River (Brazilian Amazon).
[So] Source:Zebrafish;13(6):571-577, 2016 Dec.
[Is] ISSN:1557-8542
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Microsternarchus bilineatus is a neotropical electric fish species widely distributed in Amazonian ecosystems. This work reports the first karyotypic description of the species M. bilineatus, which presented 2n = 48 chromosomes, with a distinct karyotypic formula between the sexes: males with 21 metacentric (m)/submetacentric (sm) + 27 subtelocentric (st)/acrocentric (a) and fundamental number (FN) = 69 and females with 20 m/sm + 28 st/a and FN = 68. We found a probable recent sex system of XX/XY type. The nucleoli organizer regions (NORs) were multiple terminally located, and the heterochromatic blocks were mostly pericentromeric. The 18S rDNA markings confirmed NORs and their distinction between sexes, which suggested some differential role of this gene related to gender in this species. The 5S rDNA presented terminal markings on a single chromosome pair, with no distinction between sexes, and the telomeric probes have shown a uniform pattern in males and females.
[Mh] Termos MeSH primário: Gimnotiformes/genética
Cariótipo
Região Organizadora do Nucléolo
Cromossomos Sexuais/genética
[Mh] Termos MeSH secundário: Animais
Brasil
Feminino
Masculino
RNA Ribossômico 18S/genética
RNA Ribossômico 5S/genética
Caracteres Sexuais
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (RNA, Ribosomal, 18S); 0 (RNA, Ribosomal, 5S)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171025
[Lr] Data última revisão:
171025
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160726
[St] Status:MEDLINE



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