Injury, recovery, and death, in relation to conductivity and permeability . te 0 Fig. 78.—Antagonism curves showing the net electrical resistance of Laminaria agardhiiin Af sodium acetate, in M sodium sulfate, and in mixtures of both. Ordinates repre-sent resistance (expressed as per cent, of the original resistance in sea water which is takenas 100%); abscissae represent volumetric proportions of the two salts. The dotted lineconnecting the ends of each curve shows the approximate additive efTect; the vertical dis-tance of the curve above this dotted line may be regarded as a measure
Injury, recovery, and death, in relation to conductivity and permeability . te 0 Fig. 78.—Antagonism curves showing the net electrical resistance of Laminaria agardhiiin Af sodium acetate, in M sodium sulfate, and in mixtures of both. Ordinates repre-sent resistance (expressed as per cent, of the original resistance in sea water which is takenas 100%); abscissae represent volumetric proportions of the two salts. The dotted lineconnecting the ends of each curve shows the approximate additive efTect; the vertical dis-tance of the curve above this dotted line may be regarded as a measure of antagonism. Na-acetate and Na2S04 in experiments on Laminaria, asshown in Fig. 77. On placing tissue in the pure acetate we observe thatat the end of 1% hours, the resistance has fallen to about 12 178 INJURY, RECOVERY, AND DEATH 40% of the original and in the pure sulfate it has fallento about 25% of the original, while in the mixture com-posed of equal volumes of the solution of each salt, theresistance has fallen only to about 60%. If no antagon- RES -60% ?20%. Naa »0O%S«CJt 00% 75% 50%50% W%7i% %100% Fia. 79.—Increased toxicity shown by curves of the electrical resistance of Laminariaauardhii in NaCl M, Na-citrate M (approximate) and in mixtures of these (theproportions, representing of the component solutions, are indicated on the A, observed values, after an exposure of 15 minutes to the solution, Curve B values,expected on the supposition that neither salt affects the action of the other (additive effect).The increase of toxicity is measured by the vertical distance between the curves. Allreadings were made at 23° C. or corrected to this temperature. Each observed point pre-sents the average of 10 experiments: pi-obable error of the mean less than 10% of the mean. ism were present, the resistance in the mixture shoulddrop to about 35% (additive effect). Fig. 78 shows the antagonism curves after variousintervals, using resistance
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectphysiology, bookyear1
