. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CHEMORECEPTION IN CIRRIPEDES 133 percentage response, and the logarithm of the concentration applied. The concen- tration at the intercept with a response by 50% of the population is taken to char- acterize the population threshold for the substance. This was and X 10~2 M, respectively, for ammonium and potassium. Calcium, strontium and magnesium had no influence when used at strengths of M. However, when magnesium and potassium ions were present in equal amounts, the effect of the potassium ion was slightly redu
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CHEMORECEPTION IN CIRRIPEDES 133 percentage response, and the logarithm of the concentration applied. The concen- tration at the intercept with a response by 50% of the population is taken to char- acterize the population threshold for the substance. This was and X 10~2 M, respectively, for ammonium and potassium. Calcium, strontium and magnesium had no influence when used at strengths of M. However, when magnesium and potassium ions were present in equal amounts, the effect of the potassium ion was slightly reduced, indicating antagonism. Inorganic anions appeared to be quite ineffective. v- 1 -5. -1 — 2 — 3 — 4 LOGio CONCENTRATION (M.) -5 FIGURE 3. Reaction of Lcpas anatifera to solutions of ampholytes. L-serine: triangles. Betaine: circles. Taurine: squares. The broken line for L-serine indicates predominance of stalk rather than feeding responses in the range of concentration shown (see text). RESPONSES TO AMINO ACIDS AND RELATED COMPOUNDS A typical series of results for some amino acids and related compounds, plotted as response against Log concentration, is shown in Figures 2 and 3. The lines are fitted by eye. The 50% intercepts of these, and of other compounds tested, are listed in Table T. The standard deviation of individual thresholds of response, taken as half the difference in the Log10c values corresponding to 84% and 16%, respectively, of the population responding, are entered in Table I, Column 4. It will be seen that the standard deviations for all the amino acids in which a sufficient range of re- sponse could be evoked, and also those for betaine and taurine, varied little about a mean value of The threshold concentrations are thus at least four times. 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 or
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
