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	Provedor de dados Neotropical Ichthyology (2) Autor Crampton,William G. R. (1) Nagamachi,Cleusa Y. (1) Peixoto,Luiz A. W. (1) Pieczarka,Julio C. (1) Ready,Jonathan S. (1) Silva,Danillo S. (1) Wells,Jonathan K. (1) Wosiacki,Wolmar B. (1) Mais... Palavra-chave Knife fishes (2) Communication (1) Cytogenetics (1) Electric Organ Discharge (1) FISH (1) Gymnotiformes (1) Method (1) Morphology (1) Sex chromosomes (1) Mais... Tipo do documento Info:eu-repo/semantics/article (2) Ano 2015 (1) 2006 (1) País Brazil (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última A portable bio-amplifier for electric fish research: design and construction Neotropical Ichthyology Wells,Jonathan K.; Crampton,William G. R.. The weak electric organ discharges (EODs) of gymnotiform knife fishes can be readily amplified with a wideband amplifier connected to submerged electrodes. The output from such an amplifier can then be monitored with audio speakers or digitized for subsequent analysis. Commercially available devices are expensive and usually require mains electrical power. Here we provide design notes and instructions for the construction and calibration of a cheap, portable, battery-powered, AC-coupled wideband bio-amplifier. This device was designed to allow electric fishes to be located in the field, and also to permit the relatively noise-free acquisition of EOD waveforms from specimens held in temporary captivity. This contribution is intended to encourage students of... Tipo: Info:eu-repo/semantics/article Palavras-chave: Communication; Electric Organ Discharge; Gymnotiformes; Knife fishes; Method. Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252006000200018 Karyotypic and morphological divergence between two cryptic species of Eigenmannia in the Amazon basin with a new occurrence of XX/XY sex chromosomes (Gymnotiformes: Sternopygidae) Neotropical Ichthyology Silva,Danillo S.; Peixoto,Luiz A. W.; Pieczarka,Julio C.; Wosiacki,Wolmar B.; Ready,Jonathan S.; Nagamachi,Cleusa Y.. Eigenmannia species are widely distributed in the Neotropics, with eight valid species currently recognized. Populations of Eigenmannia from three locations in the eastern Amazon were investigated using cytogenetic and morphological techniques, revealing two taxa designated here as Eigenmannia sp. "A" and Eigenmannia sp. "B". The species differ in three morphometric characters, two meristic characters, and one osteological character. Eigenmannia sp. "A" presents 2n = 34 (22 m/sm+12 st/a) and Eigenmannia sp. "B" presents 2n = 38 (14 m/sm+24st/a) and simple differentiated sex chromosomes of the type XX/XY. In both species the Constitutive Heterochromatin (CH) rich in A-T bases is distributed in the centromeric region of all chromosomes. Eigenmannia sp. "B"... Tipo: Info:eu-repo/semantics/article Palavras-chave: Cytogenetics; FISH; Knife fishes; Morphology; Sex chromosomes. Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252015000200297 Registros recuperados: 2 Primeira ... 1 ... Última

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