Results 31 to 40 of about 709 (151)

Are NORs always located on homeologous chromosomes? A FISH investigation with rDNA and whole chromosome probes in Gymnotus fishes (Gymnotiformes). [PDF]

PLoS ONE, 2013
Gymnotus (Gymnotiformes, Gymnotidae) is the most diverse known Neotropical electric knife fish genus. Cytogenetic studies in Gymnotus demonstrate a huge karyotypic diversity for this genus, with diploid numbers ranging from 34 to 54.
Susana S R Milhomem, Priscilla C Scacchetti, Julio C Pieczarka, Malcolm A Ferguson-Smith, José C Pansonato-Alves, Patricia C M O'Brien, Fausto Foresti, Cleusa Y Nagamachi   +7 more
doaj   +1 more source

Electric imaging through evolution, a modeling study of commonalities and differences. [PDF]

PLoS Computational Biology, 2014
Modeling the electric field and images in electric fish contributes to a better understanding of the pre-receptor conditioning of electric images. Although the boundary element method has been very successful for calculating images and fields, complex ...
Federico Pedraja, Pedro Aguilera, Angel A Caputi, Ruben Budelli   +3 more
doaj   +1 more source

First record of supernumerary (B) chromosomes in electric fish (Gymnotiformes) and the karyotype structure of three species of the same order from the upper Paraná River basin

Comparative Cytogenetics, 2012
Cytogenetic studies were performed on the species Apteronotus prope albifrons Linnaeus, 1766, Rhamphichthys hahni Meinken, 1937 and Brachyhypopomus gauderio Giora & Malabarba, 2009, collected in the upper Paraná River floodplain, Porto Rico ...
Valéria Mendes, Ana Luiza Portela-Castro, Horácio Júlio-Júnior   +2 more
doaj   +1 more source

Neuromodulation of early electrosensory processing in gymnotiform weakly electric fish [PDF]

Journal of Experimental Biology, 2013
Summary Sensory neurons continually adapt their processing properties in response to changes in the sensory environment or the brain's internal state. Neuromodulators are thought to mediate such adaptation through a variety of receptors and their action has been implicated in processes such as attention, learning and memory, aggression ...
Brenda Toscano, Márquez, Rüdiger, Krahe, Maurice J, Chacron   +2 more
openaire   +2 more sources

Fish fauna of headwater streams that cross the Atlantic Forest of south São Paulo state [PDF]

Check List, 2012
The fishes of the present study were collected in the headwater streams of the Sorocaba, Paranapanema and Ribeira de Iguape river basins during the dry period in 2010. A total of 2892 fishes, grouped in 53 species, were captured.
Mauricio Cetra, Walter Barrella, Francisco Neto, Abílio Martins, Bruno Mello, Rodrigo Almeida   +5 more
doaj   +3 more sources

Fish fauna in tributaries of the Suiá-Miçú River (upper Xingu river basin), in the Cerrado-Amazon transition zone, eastern state of Mato Grosso, Brazil [PDF]

Check List, 2017
Studies on the fish fauna of the Xingu river basin are mainly concentrated in the main channel of the river or its large tributaries, due to requirements all faunal surveys in hydroelectric power plant projects.
Luciano Lima, Aline Santos, Dilermando Lima Junior   +2 more
doaj   +3 more sources

Structural and histochemical aspects of the Gymnotus carapo tegument (Teleostei: Gymnotiformes)

Anais da Academia Brasileira de Ciências, 2023
The present study aims to structurally and histochemically characterize the Gymnotus carapo tegument. 30 specimens were captured and slaughtered by spinal section with anesthesia. The observation was carried out with a stereoscopic microscope and the body surface was photographed.
TANIA BLANCO COHENE, GABRIELA OLEA, CAROLINA FLORES QUINTANA   +2 more
openaire   +5 more sources

First chromosomal analysis of Gymnorhamphichthys britskii: the remarkable lowest diploid value within the family Rhamphichthyidae (Gymnotiformes)

Neotropical Ichthyology
Gymnorhamphichthys britskii is a Neotropical electric fish of family Rhamphichthyidae described from the Paraná-Paraguay system. This study reports the first karyotypic description of G.
Carlos Alexandre Fernandes, Allan Kardec Moreira de Aguiar, Leonardo Marcel Paiz, Lucas Baumgärtner, Diovani Piscor, Vladimir Pavan Margarido   +5 more
doaj   +1 more source

Spatial and temporal variation of benthic fish assemblages during the extreme drought of 1997-98 (El Niño) in the middle rio Negro, Amazonia, Brazil

Neotropical Ichthyology
Spatial and temporal variation in the benthic fish composition, species richness, density and biomass were studied in the lower rio Branco and its confluence with the rio Negro during the 1997-98 dry season (September to February).
Mario J. F. Thomé-Souza, Ning Labbish Chao   +1 more
doaj   +1 more source

A new and improved electric fish finder with resources for printed circuit board fabrication [PDF]

Neotropical Ichthyology, 2019
We describe the circuit design, construction, and operation of a field-portable electric fish finder (an AC-coupled wide-band differential bio-amplifier with loudspeaker output).
Michael A. Haag, Jeffrey C. Lambert, Joseph C. Waddell, William G.R. Crampton   +3 more
doaj   +1 more source