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Titolo:
VOLTAGE-ACTIVATED OUTWARD CURRENTS IN ADULT AND NYMPHAL LOCUST PHOTORECEPTORS
Autore:
WECKSTROM M;
Indirizzi:
UNIV OULU,DEPT PHYSIOL,KAJAANINTIE 52A SF-90220 OULU FINLAND
Titolo Testata:
Journal of comparative physiology. A, Sensory, neural, and behavioral physiology
fascicolo: 6, volume: 174, anno: 1994,
pagine: 795 - 801
SICI:
0340-7594(1994)174:6<795:VOCIAA>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
LIMULUS VENTRAL PHOTORECEPTORS; SENSITIVE POTASSIUM CHANNELS; DROSOPHILA PHOTORECEPTORS; MEMBRANE CONDUCTANCES; SINGLE MICROELECTRODE; INSECT PHOTORECEPTOR; SALAMANDER RETINA; SODIUM-CHANNELS; SMALL SIGNALS; COMPOUND EYE;
Keywords:
VOLTAGE CLAMP; POTASSIUM CHANNELS; FREQUENCY RESPONSE; DELAYED RECTIFIER; PHOTOTRANSDUCTION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
38
Recensione:
Indirizzi per estratti:
Citazione:
M. Weckstrom, "VOLTAGE-ACTIVATED OUTWARD CURRENTS IN ADULT AND NYMPHAL LOCUST PHOTORECEPTORS", Journal of comparative physiology. A, Sensory, neural, and behavioral physiology, 174(6), 1994, pp. 795-801

Abstract

The membrane properties of dark-adapted green sensitive photoreceptors of adult and nymphal desert locust (Schistocer ca gregaria) were investigated in situ with single electrode (discontinuous) current and voltage clamp techniques. The photoreceptors had a resting potential of about -70 mV. The membrane rectified strongly in response to depolarizing current pulses at and above the resting potential. Two outward currents could be distinguished on the basis of different kinetics. The first, a transient current, was inactivating between -40 mV and -100 mV, and activated above -90 mV The second, a sustained current had a similar activation range. The inactivating current could be blocked by application of 50 mM TEA into the retinal extracellular space. Both currents were expressed in nymphal photoreceptors already in the Ist instar larva and have similar properties as in the adults, although the behaviour of adults and nymphs is different. The conductances underlying these currents could be shown to modify the frequency response of the photoreceptor membrane.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/11/20 alle ore 23:39:51