Results 241 to 250 of about 7,827 (274)

Electric organ discharges of the gymnotiform fishes: III. Brachyhypopomus

Journal of Comparative Physiology A: Sensory, Neural, and Behavioral Physiology, 1999
We measured and mapped the electric fields produced by three species of neotropical electric fish of the genus Brachyhypopomus (Gymnotiformes, Rham phichthyoidea, Hypopomidae), formerly Hypopomus. These species produce biphasic pulsed discharges from myogenic electric organs. Spatio-temporal false-color maps of the electric organ discharges measured on
P K, Stoddard, B, Rasnow, C, Assad
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Classical Conditioning of Electric Organ Discharge Rate in Mormyrids

Science, 1965
Weakly electric fish of the African family Mormyridae emit pulses at variable intervals with a distribution skewed toward longer intervals. Fourteen specimens of the genera Mormyrops , Gnathonemus , and Marcusenius were classically conditioned to increase briefly their
F J, Mandriota, R L, Thompson, M V, Bennett   +2 more
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The electric organ discharges of the gymnotiform fishes: II. Eigenmannia

Journal of Comparative Physiology A: Sensory, Neural, and Behavioral Physiology, 1998
We present detailed measurements of the electric organ discharge of the weakly electric fish, Eigenmannia sp. These maps illuminate, with high resolution in both space and time, the electric organ discharge potential and electric field patterns in the water about the fish and on the skin surface itself.
C, Assad, B, Rasnow, P K, Stoddard, J M, Bower   +3 more
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Pathways of the electric organ discharge command and its corollary discharges in mormyrid fish

Journal of Comparative Neurology, 1983
AbstractThe motoneurons which innervate the mormyrid electric organ are driven by a descending volley from the medullary relay nucleus. This nucleus does not initiate the electric organ discharge (EOD) but is driven in an obligatory manner by another center, a command nucleus.
C C, Bell, S, Libouban, T, Szabo
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A temporal analysis of testosterone‐induced changes in electric organs and electric organ discharges of mormyrid fishes

Journal of Neurobiology, 1989
AbstractThe electric organ discharge (EOD) of several species of mormyrid fishes within the genus Brienomyrus is sexually dimorphic during the breeding season: the duration of the male's EOD is much longer than the duration of the female's (for a review see Hopkins, 1986).
E G, Freedman, J, Olyarchuk, M A, Marchaterre, A H, Bass   +3 more
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Synthesis of Organic Compounds by Electric Discharges

Nature, 1963
Prolonged electric spark discharges were applied to mixtures consisting essentially of methane, ammonia, water, and ethane in an investigation of the synthesis of organic compounds under possible primitive earth conditions. C/sup 14/-hydrocarbons, mainly C/sup 14/-methane, were used as tracers.
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Degradation of organic dyes in water by electrical discharges

Plasma Chemistry and Plasma Processing, 2007
The degradation of several organic compounds in aqueous solution: methyl yellow (C14H15N3), methyl red (C15H15N3O2), methyl orange (C14H14N3NaO3S), phenol red (C19H14O5S) and methylene blue (C16H18ClN3S), was investigated in a pulsed corona discharge. High voltage pulses of 17 kV amplitude, 24 ns rise time and approximately 200 ns duration (full width ...
Monica Magureanu, Nicolae Bogdan Mandache, Vasile I. Parvulescu   +2 more
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Electric Fish, Electric Organ Discharges, and Electroreception

2007
A number of animal groups have evolved sensitivity to weak electric currents that are generated by sources outside the receiver. This allows them to detect other individuals and suitable prey. Other animal groups have evolved the capacity to generate electric pulses and a surrounding electric field, together with a central nervous system that analyzes ...
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Communicating with Electric Organ Discharges

1990
During his voyage to the Orinoco river around 1800, Alexander von Humboldt reported communal attack responses in electric eels, and their power to stun prey as large as horses and mules by electric discharges. (He knew about the then recent discoveries concerning the nature of electricity, in which strong electric fish, such as the electric eel, took ...
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Species differences in electric organs of mormyrids: Substrates for species‐typical electric organ discharge waveforms

Journal of Comparative Neurology, 1986
AbstractThe organization of electric organs is described for the mormyrid fishes from Africa. The electric organ's spike‐generating cells or electrocytes are wafer‐shaped cells with a special geometry that relates to the number of phases and polarity of their pulsatile electric organ discharge (EOD) waveform.
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