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  Quantification of total calcium in terminal cisternae of skinned muscle fibres by imaging electron energy-loss spectroscopy

Stegmann, H., Wepf, R., Schröder, R. R., & Fink, R. H. A. (1999). Quantification of total calcium in terminal cisternae of skinned muscle fibres by imaging electron energy-loss spectroscopy. Journal of Muscle Research and Cell Motility, 20, 505-515. doi:10.1023/A:1005522912044.

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Alternativer Titel : Quantification of total calcium in terminal cisternae of skinned muscle fibres by imaging electron energy-loss spectroscopy

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JMuscleResCellMotil_20_1999_505.pdf (beliebiger Volltext), 220KB
 
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 Urheber:
Stegmann, Heiko1, Autor           
Wepf, Roger, Autor
Schröder, Rasmus R.1, 2, Autor           
Fink, Rainer H. A., Autor
Affiliations:
1Emeritus Group Biophysics, Max Planck Institute for Medical Research, Max Planck Society, ou_1497712              
2Department of Biomolecular Mechanisms, Max Planck Institute for Medical Research, Max Planck Society, ou_1497700              

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 Zusammenfassung: Skinned muscle fibers are ideal model preparations for the investigation of Ca2+−regulatory mechanisms. Their internal ionic milieu can be easily controlled and distinct physiological states are well defined. We have measured the total Ca content in the terminal cisternae of such preparations using imaging electron energy−loss spectroscopy (Image−EELS) as a new approach for quantification of sub−cellular element distributions. Murine muscle fibers submitted to a standardized calcium−loading procedure were cryo−fixed with a combined solution exchanger/plunge freezing device. Energy−filtered image series were recorded from ultrathin freeze−dried cryosections of samples immobilized in either relaxed or caffeine−contracted state. From these image series, electron energy−loss spectra were extracted by digital image−processing and quantitatively processed by multiple−least−squares−fitting with reference spectra. The calculated fit coefficients were converted to Ca−concentrations by a calibration obtained from Ca−standards. Total Ca−contents in the terminal cisternae of skinned skeletal muscle fibers decreased upon caffeine−induced Ca−release from 123 ± 159 (±11) to 73 ± 102 (±8) mmol/kg d.w. (weighted mean ± SD (±SEM))

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Sprache(n): eng - English
 Datum: 1999-05-031999-04-301999-05-031999
 Publikationsstatus: Erschienen
 Seiten: 11
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: eDoc: 666532
DOI: 10.1023/A:1005522912044
URI: http://www.ncbi.nlm.nih.gov/pubmed/10555069
Anderer: 4477
 Art des Abschluß: -

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Titel: Journal of Muscle Research and Cell Motility
  Andere : J. Muscle Res. Cell Motil.
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: London : Chapman and Hall
Seiten: - Band / Heft: 20 Artikelnummer: - Start- / Endseite: 505 - 515 Identifikator: ISSN: 0142-4319
CoNE: https://pure.mpg.de/cone/journals/resource/954925472360