. Electrolytes in biological systems, incorporating papers presented at a symposium at the Marine Biological Laboratory in Woods Hole, Massachusetts, on September 8, 1954 . 10 20 HOURS IN LIGHT and 30 RUNNING 50 Fig. 8. Influence of light and running sea water on the potassium content of Ulva pre- viously maintained for 16 hours in sea water containing m/1. iodoacetate in the dark. Zero time on the graph represents time of transfer to running sea water and light. Control samples were illuminated after 16 hours in the dark. sium, the net movement of sodium against its concentration gradie
. Electrolytes in biological systems, incorporating papers presented at a symposium at the Marine Biological Laboratory in Woods Hole, Massachusetts, on September 8, 1954 . 10 20 HOURS IN LIGHT and 30 RUNNING 50 Fig. 8. Influence of light and running sea water on the potassium content of Ulva pre- viously maintained for 16 hours in sea water containing m/1. iodoacetate in the dark. Zero time on the graph represents time of transfer to running sea water and light. Control samples were illuminated after 16 hours in the dark. sium, the net movement of sodium against its concentration gradient begins immediately when the cells are returned to light and running sea water, and restoration of the normal level reaches completion in about 4 hours (fig. 9). These experiments indicate that although the iodoacetate causes a marked loss of potassium and gain of sodium by the cell, this effect of iodoacetate can apparently be 'washed out' of the cell in running sea water in the presence of light. Potassium loss ceases whereas sodium ion is secreted out of the cells against its concentration gradient. Attention is directed to the diflFerential behavior of the cell as regards sodium and potassium movements in these experi- ments; although potassium is progressively lost from the cell for 25 hours sodium is excreted to the normal level within 4 hours. Influence of Arsenate on Ion Shifts Caused by Iodoacetate. Two types of
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