The Effects of Various Ions on the Sarcoplasmic Reticulum of Crayfish Muscle

Brandt, Philip W.; Frank, Alexander; Girardier, L; Reuben, John P.

doi:10.1016/b978-1-4832-2795-5.50268-9

Cited by 4 publications

(4 citation statements)

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“…found in several papers dealing with various crayfish muscles (19,20). T h e direct continuity of the tubules with the sarcolemma seems to be the rule for arthropods, this condition having been found in the insects Periplaneta, Calliphora, Apis (13), Aeshna (12), as well as the crustaceans Artemia (21) and Orconectes (19).…”

Section: Discussionmentioning

confidence: 93%

The Sarcoplasmic Reticulum of Striated Muscle of a Cyclopoid Copepod

Fahrenbach

1963

The Journal of Cell Biology

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The fine structure of the abdominal musculature of the copepod Macrocyclops albidus was investigated by electron microscopy. Tubules penetrate into the muscle fibers from the sarcolemma, continuity between the wall of the tubules and the sarcolemma being clear. A dense network of tubules envelops the myofibrils, its interstices being occupied by cisternal elements. At the Z lines the tubules traverse the interior of myofibrils, giving off branches which course longitudinally within the substance of the myofibrils. These branches are also accompanied by elongate, non-intercommunicating cisternae. Comparison of this fast acting copepod muscle with other vertebrate and invertebrate muscles indicates that the complexity of the tubular system is a function of the myofibrillar geometry, whereas the degree of development of the cisternal system is related to the contraction speed of the muscle.

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Section: Discussionmentioning

confidence: 93%

The Sarcoplasmic Reticulum of Striated Muscle of a Cyclopoid Copepod

Fahrenbach

1963

The Journal of Cell Biology

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“…The differences in the calculated volumes were small compared with the error of the measurements. Some of the preparations were subsequently fixed for histological and electron microscopic examination (3,4,12, and in preparation).…”

Section: E T H O D Smentioning

confidence: 99%

Water Transfer and Cell Structure in Isolated Crayfish Muscle Fibers

Reuben

Girardier

Grundfest

1964

The Journal of General Physiology

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Changes in volume of crayfish single muscle fibers in response to changes in ionic or electrical conditions have been studied in conjunction with electrophysiological measurements and electron microscopic examinations. The occurrence of at least three mechanisms of water movements is revealed, two being processes which are superimposed on the normal osmotic water movement that results from a change in the concentration of solute in the medium. Differences between the time courses of the changes in volume and potential on changing Ks/Ko indicate that water may be distributed unequally for a time within compartments of the fiber. Electron micrographs reveal a selective accumulation of water at the periphery of the fiber under certain conditions. A correlation of H20 transfer with a change in membrane potential is apparent in crayfish muscle fibers and is probably due to electroosmotic effects. Electrokinetic water movements are produced whenever the membrane potential is changed to a considerable degree by changing the level of K and/or Cl in the medium, or by applying currents with an intracellular microelectrode. Depolarizations cause shrinkage. Hyperpolarizations or repolarizations cause swelling. The volume changes are independent of the occurrence or absence of swelling in the anion-permselective transverse tubular system. They indicate that the fiber membrane along the surface is heterogeneous, not only with respect to the signs of its fixed charge sites, but also with respect to the sizes and relative permselectivities of these charged channels. I N T R O D U C T I O NStudies of the m o v e m e n t of ions and water across the cell m e m b r a n e with correlated osmometric, electrophysiological, and morphological methods m a y be expected to yield m o r e information on the properties of the m e mb r a n e and a b o u t the structure of the cell t h a n can be obtained with any one II4I

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“…No structural damage to the myofilaments is evident in any of the irradiated muscles. Bergstrom and Salmi (1962) observed similar vacuolization of the sarcoplasmic reticulum in the vertebrate striated muscle exposed to 30 000 R. Brandt, Frank, Giradier and Reuben (1962) showed that, if crayfish muscle fibres are soaked in normal Ringer solution for 20 min after pre-soaking in K+ Ringer, the sarcoplasmic reticulum appeared swollen. Radiation is known to affect membrane potential and induce potassium leakage in the vertebrate muscle fibres (Darden 1960).…”

mentioning

confidence: 91%