1960
DOI: 10.1007/978-3-642-49246-4
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The Alkali Metal Ions in Biology

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Cited by 131 publications
(69 citation statements)
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“…The separation factors for K -Na and Rb -Na exceed those found in better defined organic nonliving systems by a factor of 100 to 1000 and it is therefore not possible at the present to explain selectivity in many organisms without ad hoc assumptions (6,16,28,29). Regardless of the molecular nature of the ion discrimination system, one could state that for a cell system which accumulates ion X in preference to Y, the cell is in a lower energy state when containing X.…”
Section: Methodsmentioning
confidence: 90%
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“…The separation factors for K -Na and Rb -Na exceed those found in better defined organic nonliving systems by a factor of 100 to 1000 and it is therefore not possible at the present to explain selectivity in many organisms without ad hoc assumptions (6,16,28,29). Regardless of the molecular nature of the ion discrimination system, one could state that for a cell system which accumulates ion X in preference to Y, the cell is in a lower energy state when containing X.…”
Section: Methodsmentioning
confidence: 90%
“…This ranking which follows the order of monovalent cations in Group I of the periodic table is not the only possible one and has been found to be partially or completely reversed in some organisms (2,28,29). A similar reversal of the selective order of monoovalent cations has also been observed in non-living systems and has been shown to depend on the nature of the anionic charge intensity, the geometry of the matrix holding together the fixed negative charges, and the hvdration of the svstem (6,10,16).…”
Section: Methodsmentioning
confidence: 98%
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