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  Activation and inhibition of the sarcoplasmic calcium transport

Hasselbach, W., Makinose, M., & Fiehn, W. (1970). Activation and inhibition of the sarcoplasmic calcium transport. In A. Cuthbert (Ed.), A Symposium on Calcium and Cellular Function (pp. 75-84).

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Hasselbach, Wilhelm1, Author           
Makinose, Madoka2, Author           
Fiehn, Walter2, Author           
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1Emeritus Group Biophysics, Max Planck Institute for Medical Research, Max Planck Society, ou_1497712              
2Max Planck Institute for Medical Research, Max Planck Society, ou_1125545              

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 Abstract: Many observations suggest that all cells possess transport systems for the elimination of ionized calcium from the cytoplasm. Presumably no cell can tolerate high concentrations of free calcium ions intracellularly, but so far the concentration of free calcium ions which can be tolerated is known for only one cell with any degree of accuracy. In the resting giant muscle fibres of Maia (Portzehl, Caldwell & Rüegg, 1964) and Balanus (Hagiwara, 1966) the free calcium concentration has been found not to exceed 5 × 10−7 m. On the other hand, these muscles like any other muscle need relatively large amounts of calcium ions for the activation of their contractile machinery (Weber & Herz, 1963; Jöbsis, 1967; Ashley & Ridgway, 1969). These quantities are presumably liberated in a few milliseconds during excitation. The removal of these ions from the cytoplasm brings activation to a halt, and at room temperature the time required for this process is in the range of 10–100 msec. In skeletal muscles these rapid calcium movements take place mainly across the membranes of the sarcoplasmic reticulum. The sarcoplasmic membranes are especially suitable objects for studying the mechanism of and the structural basis for the active transport of calcium ions.
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Language(s): eng - English
 Dates: 1970
 Publication Status: Issued
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Title: A Symposium on Calcium and Cellular Function
Source Genre: Book
 Creator(s):
Cuthbert, A.W., Editor
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Pages: 301 Volume / Issue: - Sequence Number: - Start / End Page: 75 - 84 Identifier: -