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C. Adams (1966)
Biology of NeurogliaNature, 210
) C . R . Lab
(1965)
Nature ( h n d
(1954)
Neurosciences Research Program Bulletin 2, supplement. LOWRY 0
(1963)
PerL 0 w A
(1935)
Amer
(1953)
1,239. 36,217. bioIogists
(1957)
Biochim . biophys
O. Lowry (1957)
ENZYME CONCENTRATIONS IN INDIVIDUAL NERVE CELL BODIES
Department of Biochemistry A, University of Copenhagen, 30 Juliane Maries Vej and Biological Institute of the Carlsberg Foundation, Copenhagen a, Denmark (Reeeited 7 May 1966) BRAIN slices react to an increased concentration of potassium or a decreased concentration of sodium in a manner, which is unique to this tissue (ASHFORD DIXON, and 1935; DICKENS GREVILLE, and 1935; ELLIOTT LIBET, and 1942; HERTZ CLAUSEN, and 1963). During incubation in media with a âbalancedâ ion composition (e.g. 120 mM-sodium and 5 mM-potassium), their rate of oxygen consumption is quite well maintained at about 90 pmoles/g fresh wt./hr. Exposure to sodium-free media, however, causes a very rapid decrease of the respiration, until the rate of oxygen uptake reaches a level at about 10 per cent of its original value; thereafter the decline stops and the residual respiration-which seems to be unaffected by lack of sodiumcontinues for hours. This peculiar course of the respiration may indicate that the slice contains two different fractions, e.g. two cell types, which do not react identically to lack of sodium. The originally larger fraction shows a rapidly declining rate of oxygen uptake, whereas the respiration in the originally smaller fraction remains stable and accordingly is unmasked
Journal of Neurochemistry – Wiley
Published: Dec 1, 1966
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