By P.G. LeFevre

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At the same time, the D. c. resistance was markedly increased. On the outside surface, eserine was not very effective. Atropine on the outside reversibly and markedly elevated the Na+ accumulation in Rana esculenta, but oddly enough this effect was not- seen in R. temporaria. LINDERHOLM (1952) made excellent use of this frog skin Na+-transport system to elucidate the basic action of some of the chief clinical diuretic agents, and confirmed thereby many of USSING'S observations. He argues that CONWAY'S (1951) "redox pump," as the basis for this Na+ transport, provides the most complete interpretation of the experimental facts.

Z I:::I 0 u \ - -- \ -- PHOSPHOCREA TINE A- :z PLASMA INORGANIC PHOSPHATE ~ 30 - 6 5 4 2 / / / / / / / /'" r-- \. / '\ '\ \ INTRACELLULAR INORGANIC PHOSPHATE 8 16 TIME AFTER INJECTION, HOURS Fig. 16. Time course of P" uptake by phosphocreatine and intracellular inorganic P of heart muscle of cats. /mg. P are adjusted to standard initial injection 5 . 10' counts/min. per kg. of body weight. (Courtesy of J. SACKS and Cold Spring Harbor Symposia) largely on the basis simply of the known physical and chemical make-up of the erythrocyte surface and consideration of the possible interplay of the ingredients by reason of their general chemical properties.

Under these circumstances, the a-ketoglutarate ratio (inside/outside) was only about 11:,. 1 I- 10" z: w U co: "- III ':[ ~ HITROGEN 114 G... s PHASE ~~ I S~ ... RSEHITE 100 50 I'" 100'\ CV ... HIOE 0:-;; 100 ~ 50 10" - b. 1(" 0----0 QQ, 10" MOLU COHCEHTR ... TIOH OF IHHIBITOR Fig. 13. Elfect of metabolic inhibitors on K + accumulation and respiration, as in Fig. 12. In alI experiments, acetate was provided at 10 mM. (Courtesy of G. H. 5. AEBI (1953) compared a variety of lilammalian tissue slices in this type of experiment, and found the kidney by far the most active in accumulat- 39 Transport of Inorganic Cations Table VIII.

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