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Titolo:
OTOACOUSTIC EMISSIONS, HAIR-CELLS, AND MYOSIN MOTORS
Autore:
MANLEY GA; GALLO L;
Indirizzi:
TECH UNIV MUNICH,INST ZOOL,LICHTENBERGSTR 4 D-85747 GARCHING GERMANY
Titolo Testata:
The Journal of the Acoustical Society of America
fascicolo: 2, volume: 102, anno: 1997,
parte:, 1
pagine: 1049 - 1055
SICI:
0001-4966(1997)102:2<1049:OEHAMM>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
BOBTAIL LIZARD; TRANSDUCTION; MUSCLE; FLUCTUATIONS; STEREOCILIA; ADAPTATION; MECHANICS; SPRINGS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
40
Recensione:
Indirizzi per estratti:
Citazione:
G.A. Manley e L. Gallo, "OTOACOUSTIC EMISSIONS, HAIR-CELLS, AND MYOSIN MOTORS", The Journal of the Acoustical Society of America, 102(2), 1997, pp. 1049-1055

Abstract

The stereovillar bundles of hair cells show active movements that maybe generated by the putative myosin-actin interactions underlying hair-cell adaptation. Such movement is a possible candidate for the generation of spontaneous otoacoustic emissions (SOAE) in the ear canal of nonmammals. In the basilar papilla of certain lizard families, most hair cells are not coupled by a tectorial membrane, making it easier to assign the energy in emission peaks to defined groups of hair cells. We have studied 62 SOAE in the Bahamian Anole Anolis sagrei, which has about 140 hair cells with ''free-standing'' bundles in the high-frequency area of its papilla. Individual SOAE peaks were traced to between 3 and 38 hair cells, and the mean power output per hair cell was calculated to be 141 aW. The number of bundle myosins putatively involved in the generation of each SOAE was estimated and the force generated byeach myosin at 1 kHz calculated to be approximately 0.1 pN. The data support the idea that hair cells generate emissions and suggest that myosin produces sufficient power to be the emission motor. (C) 1997 Acoustical Society of America.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/11/20 alle ore 04:19:29