Comparative Aspects of Muscle

Hoyle, Graham

doi:10.1146/annurev.ph.31.030169.000355

Cited by 64 publications

(34 citation statements)

References 70 publications

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“…If we also reduce our measured thick filament widths by 15% this would bring their diameter down to ~21nm, still clearly greater than the width of vertebrate myosin filaments but in the same range as that in other obliquely striated muscles (Hoyle, 1969). Differences in diameter could reflect differences in the packing of the myosin molecules or the presence of other proteins, e.g.…”

Section: Organization Of the Myofilamentsmentioning

confidence: 87%

The ultrastructure and contractile properties of a fast-acting, obliquely striated, myosin-regulated muscle: the funnel retractor of squids

Rosenbluth

Szent‐Györgyi

Thompson

2010

Journal of Experimental Biology

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SUMMARYWe investigated the ultrastructure, contractile properties, and in vivo length changes of the fast-acting funnel retractor muscle of the long-finned squid Doryteuthis pealeii. This muscle is composed of obliquely striated, spindle-shaped fibers ~3mm across that have an abundant sarcoplasmic reticulum, consisting primarily of membranous sacs that form 'dyads' along the surface of each cell. The contractile apparatus consists of 'myofibrils' ~0.25-0.5mm wide in cross section arrayed around the periphery of each cell, surrounding a central core that contains the nucleus and large mitochondria. Thick myofilaments are ~25nm in diameter and 2.8mm long. 'Dense bodies' are narrow, resembling Z lines, but are discontinuous and are not associated with the cytoskeletal fibrillar elements that are so prominent in slower obliquely striated muscles. The cells approximate each other closely with minimal intervening intercellular connective tissue. Our physiological experiments, conducted at 17°C, showed that the longitudinal muscle fibers of the funnel retractor were activated rapidly (8ms latent period following stimulation) and generated force rapidly (peak twitch force occurred within 50ms). The longitudinal fibers had low V max (2.15 ±0.26L 0 s -1 , where L 0 was the length that generated peak isometric force) but generated relatively high isometric stress (270±20mNmm -2 physiological cross section). The fibers exhibited a moderate maximum power output (49.9Wkg

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Section: Organization Of the Myofilamentsmentioning

confidence: 87%

The ultrastructure and contractile properties of a fast-acting, obliquely striated, myosin-regulated muscle: the funnel retractor of squids

Rosenbluth

Szent‐Györgyi

Thompson

2010

Journal of Experimental Biology

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“…The lengths of the filaments and thereby the sarcomere lengths are often greater than in vertebrate muscles; the sarcomere length may be up to 10 llm (for references see HAGOPIAN 1966;REGER 1967a, b;REGER and COOPER 1967;HOYLE 1967HOYLE ,1969ZOBEL et al 1967;FAHRENBACH 1967;HAGOPIAN and SPIRO 1968;FRANZINI-ARMSTRONG 1970a;HAYES et al 1971;DEWEY et al 1973;PRINGLE 1974). The ratio of thick-to-thin filaments tends to be larger in muscles with fast contractions (1: 3 in insect flight muscles) than in muscles with slow contractions (1: 7 to 1: 10).…”

Section: The Arrangement Of Myofilaments In Sarcomeresmentioning

confidence: 99%

Skeletal Muscle

Schmalbruch

1985

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“…during escape swimming, comprise mainly fast-type fibres that are biochemically equipped for rapid burst activity (Neil et al 1993). These fast-type crustacean muscles are generally similar in both structure and metabolic properties to vertebrate fast-type muscles (Hoyle 1969;Beis & Newsholme 1975;Hooper & Thuma 2005;Gornik et al 2008). To meet the energy demands of tail flipping and in a variety of other physiological circumstances, such fast-type muscles utilize anaerobic energy pathways (mainly glycolytic fermentation) (Ellington 1983).…”

Section: Introductionmentioning

confidence: 99%

The influence of defined ante-mortem stressors on the early post-mortem biochemical processes in the abdominal muscle of the Norway lobster,Nephrops norvegicus(Linnaeus, 1758)

Gornik

Albalat

Atkinson³

et al. 2010

Marine Biology Research

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The effects of four different ante-mortem stressors (exercise, emersion, starvation and a patent infection with the parasite Hematodinium sp.) on post-mortem processes have been investigated in the abdominal muscle of Norway lobster Nephrops norvegicus by measuring changes in the pH, the levels of glycogen, L-lactate, arginine phosphate, ATP, ADP, AMP, IMP, HxR, Hx and the adenylate energy charge (AEC) over a time course of 24 h with samples being taken at 0, 3, 6, 12 and 24 h. The acute stresses of intense exercise and 2 h emersion resulted in a premature onset of anaerobic glycolysis, leading both to an enhanced glycogen depletion rate and an early accumulation of L-lactate. The chronic stressors, starvation and parasite infection, resulted in a complete ante-mortem depletion of muscle glycogen and consequently the failure of post-mortem glycolytic fermentation. Post-mortem pH and ATP inter-conversion were significantly altered in chronically stressed animals. Ante-mortem, a rapid, almost complete depletion of arginine phosphate was observed in all stress groups. The AEC was altered significantly by all stresses, indicating a strong energy demand. The findings suggest that ante-mortem stressors strongly influence the post-mortem biochemical processes. The laboratory-based results are compared to 'field' data and effects on post-harvest product quality are discussed.

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Comparative Aspects of Muscle

Cited by 64 publications

References 70 publications

The ultrastructure and contractile properties of a fast-acting, obliquely striated, myosin-regulated muscle: the funnel retractor of squids

The ultrastructure and contractile properties of a fast-acting, obliquely striated, myosin-regulated muscle: the funnel retractor of squids

Skeletal Muscle

The influence of defined ante-mortem stressors on the early post-mortem biochemical processes in the abdominal muscle of the Norway lobster,Nephrops norvegicus(Linnaeus, 1758)

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