. Electrolytes in biological systems, incorporating papers presented at a symposium at the Marine Biological Laboratory in Woods Hole, Massachusetts, on September 8, 1954 . ^S. by anaerobic conditions, the same is not true of the fast, initial exchange re- action. In order to determine the rate of the metabolic absorption of Sr* unobscured by the additional exchange increment, we let the roots absorb Sr* under the given experimental conditions, and then 'stripped off' the non-metabolically held, exchangeable Sr* by means of a 30-minute exposure to non-radioactive Sr. In this manner, we measure
. Electrolytes in biological systems, incorporating papers presented at a symposium at the Marine Biological Laboratory in Woods Hole, Massachusetts, on September 8, 1954 . ^S. by anaerobic conditions, the same is not true of the fast, initial exchange re- action. In order to determine the rate of the metabolic absorption of Sr* unobscured by the additional exchange increment, we let the roots absorb Sr* under the given experimental conditions, and then 'stripped off' the non-metabolically held, exchangeable Sr* by means of a 30-minute exposure to non-radioactive Sr. In this manner, we measured only the non-exchangeable fraction, the fraction that had been absorbed as distinguished from the exchangeably ad- sorbed Sr* fraction. Measured in this way, absorption was found to be a linear function of time and a single measurement, at the 180-minute point, gave an adequate determination of the rate, v, of Sr* absorption. Figure 4 shows a double-retiprocal plot of Sr* absorption as a function of the concentration of Sr* (S), in the absence and presence of Ca and Mg as inter- fering ions. Straight lines were obtained as in the case of the monovalent ions.
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