scholarly journals Mechanical Properties of Demembranated Flight Muscle Fibres from a Dragonfly

1991 ◽  
Vol 159 (1) ◽  
pp. 135-147
Author(s):  
M. PECKHAM ◽  
D.C. S. WHITE
Keyword(s):  
Mechanical Properties ◽  
Flight Muscle ◽  
Muscle Length ◽  
Psoas Muscle ◽  
Muscle Fibres ◽  
Active Tension ◽  
Rabbit Psoas ◽  
King's College ◽  
Flight Muscles ◽  
Drury Lane

The mechanical properties of demembranated muscle fibres of synchronous flight muscle from a dragonfly Libellula quadrimaculata, asynchronous flight muscle from the giant waterbug Lethocerus indicus and synchronous psoas muscle from rabbit were compared in relaxed, active and rigor conditions. The properties were compared to the known structure and protein compositions of these muscles. We found that active tension of L. indicus flight muscles was stretch-activated (tension was low and was significantly increased following a rapid stretch of 1 % of muscle length), whereas both dragonfly flight muscle and rabbit psoas muscle were not (active tension was high and did not significantly increase following a rapid stretch of 1%). Three different properties have been suggested to give rise to stretch activation in asynchronous muscles: (1) a matching of the helix periodicities of actin target sites to myosin crossbridge heads, (2) a special form of troponin subunit called troponin-H, and (3) the high resting stiffness of these muscles inducing strain in the thick filaments. Rabbit psoas muscle has none of these properties. Dragonfly flight muscles do not have the helix matching, but they do have a form of troponin-H and a high resting stiffness. It seems most likely that dragonfly flight muscles are not stretch-activated because they do not have the helix matching. Note: Present address: Department of Biophysics, King's College London, 26–29 Drury Lane, London, WC2B 5RL, UK.

scholarly journals Reversal of the cross-bridge force-generating transition by photogeneration of phosphate in rabbit psoas muscle fibres.

1992 ◽  
Vol 451 (1) ◽  
pp. 247-278 ◽  
Author(s):  
J A Dantzig ◽  
Y E Goldman ◽  
N C Millar ◽  
J Lacktis ◽  
E Homsher
Keyword(s):  
Psoas Muscle ◽  
Muscle Fibres ◽  
Rabbit Psoas ◽  
Cross Bridge ◽  
The Cross

scholarly journals The Length of Cooperative Units on the Thin Filament in Rabbit Psoas Muscle Fibres

2002 ◽  
Vol 87 (6) ◽  
pp. 691-697 ◽  
Author(s):  
Wei Ding ◽  
Hideaki Fujita ◽  
Masataka Kawai
Keyword(s):  
Thin Filament ◽  
Psoas Muscle ◽  
Muscle Fibres ◽  
Rabbit Psoas ◽  
Cooperative Units

scholarly journals Effect of active shortening on the rate of ATP utilisation by rabbit psoas muscle fibres

2001 ◽  
Vol 531 (3) ◽  
pp. 781-791 ◽  
Author(s):  
Y.‐B. Sun ◽  
K. Hilber ◽  
M. Irving
Keyword(s):  
Psoas Muscle ◽  
Muscle Fibres ◽  
Rabbit Psoas

scholarly journals Mutations of Drosophila melanogaster that affect muscles

Development ◽  
1977 ◽  
Vol 40 (1) ◽  
pp. 35-63
Author(s):  
I. I. Deak
Keyword(s):  
Drosophila Melanogaster ◽  
Flight Muscle ◽  
Fat Body ◽  
Muscle Fibres ◽  
Muscle Structure ◽  
Site Of Action ◽  
Chromosome Mutations ◽  
Complementation Groups ◽  
Flight Muscles ◽  
Genetic Techniques

Eight X-chromosome mutations (falling into five complementation groups) that affect the development and morphology of the indirect flight muscles of Drosophila melanogaster were investigated using histological, behavioural and genetic techniques. All of these mutations result in Sightlessness, in a marked reduction in the ability of the flies to jump, and in the wings being held in abnormal positions. Mutations in each of the complementation groups have different effects on the morphology of the muscles. Two (flapwing, vertical wing) result in absence of most of the indirect flight muscle fibres, a third (upheld) is required for the gross organization of muscle structure, another (heldup) is involved in the maintenance of muscle structure once formed, and the fifth seems to be necessary for the detailed architecture of the muscle fibre (indented thorax). The analysis of flies genetically mosaic with respect to each mutation by the technique of fate-mapping suggests that three (heldup, upheld and indented thorax) of the genes concerned have their primary site of action in the musculature itself, while the other two(flapwing and vertical wing) may function primarily in the fat-body and tracheae respectively.

Interspike interval relationship among flight muscle fibres in Drosophila

1980 ◽  
Vol 87 (1) ◽  
pp. 137-147 ◽  
Author(s):  
J. H. Koenig ◽  
K. Ikeda
Keyword(s):  
Interspike Interval ◽  
Flight Muscle ◽  
Motor Units ◽  
Muscle Fibres ◽  
Interspike Intervals ◽  
Neural Input ◽  
Flight Muscles ◽  
Bilateral Pair ◽  
Left And Right ◽  
Driving Source

Simultaneous intracellular recordings were made from the 10 motor units (12 fibres) comprising the bilateral pair of dorsal longitudinal flight muscles in Drosophila melanogaster while in stationary flight. The neural input which commonly drives these units was characterized by observing the influence which this input has on the interspike intervals of the various units. It was observed that the intervals of these units (both ipsilateral and contralateral), when considered collectively (that is, as a series of successively occurring intervals without regard for which unit represents which interval), fluctuate in a serially correlated manner. These interval fluctuations collectively define a fluctuation of complex waveform. The characteristics of this waveform suggest that two (or more) oscillating inputs are involved in commonly driving these units. In addition, a coupling in frequency and timing was observed between certain pairs of ipsilateral units, as well as between the units of one side relative to those of the other side. This coupling suggests that the neural pathway leading from the oscillating driving source might diverge, first to left and right sides, and then at a more peripheral level into three separate pathways, one leading to units 1 and 2, another to units 3 and 4, and a third to unit 5/6.

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