Injury, recovery, and death, in relation to conductivity and permeability . .02 .04 .06 n Fig. 74.—Curves showing between NaCl and caffeine. Ordinates represent netelectrical resistance of Laminaria agardhii (expressed as per cent, of the normal); abscissaerepresent concentrations of caffeine added to M NaCl. The resistance of the controlat ^ hours was 96%. Average of two experiments; probable error of the mean less than 5% of the mean. concentrations of alkaloid. With cevadine (Fig. 75) thecurve falls much more rapidly, the maximum being in theneighborhood of M ceva
Injury, recovery, and death, in relation to conductivity and permeability . .02 .04 .06 n Fig. 74.—Curves showing between NaCl and caffeine. Ordinates represent netelectrical resistance of Laminaria agardhii (expressed as per cent, of the normal); abscissaerepresent concentrations of caffeine added to M NaCl. The resistance of the controlat ^ hours was 96%. Average of two experiments; probable error of the mean less than 5% of the mean. concentrations of alkaloid. With cevadine (Fig. 75) thecurve falls much more rapidly, the maximum being in theneighborhood of M cevadine sulfate. Here death 172 INJURY, RECOVERY, AND DEATH is more rapid, the tissue being killed in 18 hours or less,even in the most favorable solution. The experiments with cevadine were carried out dur- 8oi%. oin FiQ. 75.—Curves showing antagonism between NaCl and cevadine sulfate. Ordinatesrepresent net electrical resistance of Laminaria ac/ardhii (expressed as per cent, of the normal);abscissse represent concentrations of cevadine sulfate added to M NaCl. The resistanceof the control at 150 minutes was 100%. Average of two experiments; probable error of the mean less than 5% of the mean. ing the day at 15 ±2°, and the time curves in the varioussolutions follow more or less closely a monomolecularcourse. In the case of nicotine and caffeine (where theexperiment ran during the day and the following night)this is not the case, except in the earlier part of the reac- ANTAGONISM 173 tion. This is perhaps explained by the fall of tempera-ture which occurred during the night and retarded thespeed of the process. It should be noted that all the experi-ments in any set were begun at the same time, so that allshared equally in the variations of temperature; inconsequence the form of the a
Size: 1489px × 1678px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjectphysiology, bookyear1
