. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SODIUM AND CHLORIDE EXCHANGE IN NEREIS 595 \ cu cr> c; D jz o X (U. No of medium, mM/l K 4. Effect upon Na exchange-rate of adaptation to very low Na-concentrations fol- lowed by abrupt transfer to higher concentrations. Closed circles and curve indicate Na-influx of control worms in steady state adaptation; open circles show Na-influx after transfer from SW (Na = ca. 1 niM/liter), half-open circle after transfer from \% SW (Na = o/. 5 imi/liter). at low salinities. As is indicated in Figure 4, only in the case of tr
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SODIUM AND CHLORIDE EXCHANGE IN NEREIS 595 \ cu cr> c; D jz o X (U. No of medium, mM/l K 4. Effect upon Na exchange-rate of adaptation to very low Na-concentrations fol- lowed by abrupt transfer to higher concentrations. Closed circles and curve indicate Na-influx of control worms in steady state adaptation; open circles show Na-influx after transfer from SW (Na = ca. 1 niM/liter), half-open circle after transfer from \% SW (Na = o/. 5 imi/liter). at low salinities. As is indicated in Figure 4, only in the case of transfer from SW to 1% SW is there a scarcely significant increase of Na-uptake over the rate characteristic of worms adapted to \% SW. In all other types of transfer: from Q2r/c SW to 3% or 5'/i SW, and from \% to 3f/( SW. the uptake as measured in the first hour after transfer tended to fall below the steady-state curve. Although the rates of the several transfer groups are not statistically significantly lower, they are generally below the steady-state curve and (with the possible exception of the to \% SW transfer) indicate no activation of Na-uptake. The combined results of transfer from and \% SW to '$% SW are significantly lower statistically than the steady-state uptake rate of animals adapted to 3% Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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