Results 281 to 290 of about 64,731 (311)

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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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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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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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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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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Numerical Simulations of the Electric Organ Discharge of Weakly Electric Fish

1993
A model of a weakly electric fish was constructed with data taken from Apteronotus leptorhynchus, and the electric organ discharge was simulated using boundary element and finite element methods. Maps of the electric potential measured around a live fish were used to calibrate the model parameters and test the results.
Christopher Assad, Brian Rasnow, James M. Bower   +2 more
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Discrimination of individually characteristic electric organ discharges by a weakly electric fish

Animal Behaviour, 1992
Abstract Waveform analysis of the electric organ discharges (EODs) of the weakly electric fish Gymnotus carapo found significant variation between individuals but little variation in EODs from the same individual. That is, EOD waveforms are individually distinctive.
Peter K. McGregor, G.W. Max Westby
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Species Diversity of Electric Organ Discharge Activity

1990
The discharge activity of an electric fish depends on the complex anatomical and physiological detail of its electric organs (for the discharge waveform) and central nervous command structures (for the discharge rate). Phylogenetic groups and, within a group, the species it comprises, differ in these structures and their physiological properties (see ...
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Organic microstructures as products of Miller-Urey electrical discharges

Precambrian Research, 1975
Abstract Massive yields of discrete groups of highly structured morphological entities are formed by sparking methane and nitrogen over a water surface. These structures were studied by light microscopy and by transmission and scanning electron microscopy. Chemical studies suggest the presence of a cross-linked kerogenous polymer matrix.
C.E. Folsome, R.D. Allen, N.K. Ichinose
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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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