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Titolo:
CONTRACTILE PROPERTIES OF OBLIQUELY STRIATED-MUSCLE FROM THE MANTLE OF SQUID (ALLOTEUTHIS-SUBULATA) AND CUTTLEFISH (SEPIA-OFFICINALIS)
Autore:
MILLIGAN BJ; CURTIN NA; BONE Q;
Indirizzi:
MARINE BIOL ASSOC UNITED KINGDOM LAB,CITADEL HILL PLYMOUTH PL1 2PB DEVON ENGLAND MARINE BIOL ASSOC UNITED KINGDOM LAB PLYMOUTH PL1 2PB DEVON ENGLAND CHARING CROSS & WESTMINSTER MED SCH,DEPT PHYSIOL LONDON W6 8RF ENGLAND
Titolo Testata:
Journal of Experimental Biology
fascicolo: 18, volume: 200, anno: 1997,
pagine: 2425 - 2436
SICI:
0022-0949(1997)200:18<2425:CPOOSF>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
FORCE-VELOCITY RELATION; ISOMETRIC TENSION; SKELETAL-MUSCLE; FIBERS; FROG; TEMPERATURE; DOGFISH; TWITCH;
Keywords:
MUSCLE CONTRACTION; POWER; OBLIQUELY STRIATED MUSCLE; MANTLE MUSCLE; CEPHALOPOD MUSCLE; SQUID; CUTTLEFISH; ALLOTEUTHIS SUBULATA; SEPIA OFFICINALIS; FORCE-VELOCITY RELATIONSHIP;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
46
Recensione:
Indirizzi per estratti:
Citazione:
B.J. Milligan et al., "CONTRACTILE PROPERTIES OF OBLIQUELY STRIATED-MUSCLE FROM THE MANTLE OF SQUID (ALLOTEUTHIS-SUBULATA) AND CUTTLEFISH (SEPIA-OFFICINALIS)", Journal of Experimental Biology, 200(18), 1997, pp. 2425-2436

Abstract

The mechanical properties of obliquely striated muscle fibres were investigated using thin slices of mantle from squid Alloteuthis subulataand cuttlefish Sepia officinalis, Brief tetani or twitch stimuli wereused as this pattern is likely to occur during jetting of the intact animal, The length-active force relationship for twitches and tetani (0.1 s, 50 Hz) was similar to that of vertebrate cross-striated fibres,Passive force at the length giving maximum tetanic force was 0.13+/-0.05 P-0 (mean +/- S.E.M., N=6, where P-0 is maximum isometric tetanus force) and increased steeply at longer lengths, Peak force in a brief isometric tetanus (0.2 s, 100-150 Hz) was 262+/-16 mN mm(-2) cross-sectional area of wet tissue (N=6) for squid, and 226+/-19 mN mm(-2) (N=7) for cuttlefish, The force-velocity relationship for isotonic shortening during twitches of squid mantle slices was a 'double hyperbolic' relationship as described for cross-striated fibres by Edman, Fitting Edman's equation to the results gave: P=1.18+/-0.07, V-max=2.43+/-0.11L-tw s(-1) and 1/G-0.69+/-0.13 (N=8), where P is the intercept on the force axis expressed relative to P-tw, peak isometric twitch force, V-max is the intercept on the velocity axis, L-tw is the length at which P-tw is produced and G is the constant expressing curvature, The large values of 1/G indicate that the force-velocity relationship is notvery curved, Maximum power was produced during shortening at 0.45+/-0.03P(tw) (N=8), Maximum power during twitch contraction was 18.3+/-1.7mW g(-1) wet mass or, expressed in relative units, (V/V-max)(P/P-tw),where V is the velocity during shortening and P is the force during shortening, was 0.16+/-0.81 (N=8), which is higher than that of many cross-striated locomotor muscles.

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Documento generato il 27/09/20 alle ore 00:09:34