Crab Muscle Fibres Research Articles

Gamma-aminobutyric acid and crab muscle fibres.

Eine Reihe von Krabbenmuskeln zeigt zwei Arten von Muskelfasern: «phasische» und «tonische» mit sehr unterschiedlichen Membraneigenschaften. Die phasischen Muskelfasern zeigen verhältnismässig kleine Permeabilitätsänderungen der Membranen nach Zugabe von GABA oder nach Stimulierung des peripheren hemmenden Axons. Die tonischen Muskelfasern zeigen sehr deutliche Permeabilitätsänderungen nach Zugabe von GABA oder Stimulierung des hemmenden Axons. Die Grundlagen dieses unterschiedlichen Verhaltens werden analysiert.

Structural and functional correlations in crab muscle fibers

Structural and functional correlations in crab muscle fibers

STUDIES ON THE MICRO-INJECTION OF VARIOUS SUBSTANCES INTO CRAB MUSCLE FIBRES.

STUDIES ON THE MICRO-INJECTION OF VARIOUS SUBSTANCES INTO CRAB MUSCLE FIBRES.

Membrane current of crab muscle.

THE electrophysiology of crab muscle fibres appears to be different from that of other skeletal muscles in that crab muscle ordinarily does not support a propagated action potential. Instead, local end plate potentials initiate and abolish muscle contraction1,2. To determine the relationship between transmembrane potential, current, and time, experiments were performed on the closer muscle of the walking legs of crab (Cancer magister) collected at the University of Washington Laboratories at Friday Harbor, Washington. The artificial saline solution used contained sodium chloride 466 mM, potassium chloride 8 mM, magnesium chloride 12 mM, calcium chloride 20 mM.

An investigation of the intracellular pH of crab muscle fibres by means of micro-glass and micro-tungsten electrodes.

An investigation of the intracellular pH of crab muscle fibres by means of micro-glass and micro-tungsten electrodes.

THE EFFECTS OF CALCIUM ON ISOLATED ARTHROPOD MUSCLE FIBERS

1. When isolated single muscle fibers of blue crab, lobster and grasshopper have their cut ends exposed to solutions containing the calcium ion, they show the same effects as do frog muscle fibers; that is to say, they shorten and the protoplasm clots. However, the wave of clotting is faster in grasshopper muscle than it is in frog muscle. The degree of shortening of arthropod muscle fibers is less than that of frog muscle.2. Evidence indicates that single muscle fibers of the grasshopper are more sensitive to calcium ions than are single fibers of the frog and blue crab.3. The rate of movement of the protoplasmic clot in invertebrates is relatively rapid during the first minute. However, there is a gradual decrease in this rate after the first minute.4. The clotting reaction can be prevented in invertebrate muscle fibers. In grasshopper muscle fibers, concentrations of 0.005 M sodium or potassium oxalate are effective in preventing the formation of the protoplasmic clot. Ca-free sea water is in itself su...