. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 154 MARCIA J. LOEB AND RICHARD S. BLANQUET LU h- LiJ CO ~Z. o Q_ CO LiJ or o Q LJ LJ 60 50 40 30 20 10 T~. I0~': IO'12 10"" IO~IC IO'9 I0~8 IO'7 DOSE (MOLAR ITY) IO"6 IO"5 IO"4 IO'3 FIGURE 2. Differences in feeding response time as the concentration of feeding behavior stimulus is changed. Open symbols equal response to reduced glutathione. Bars represent the spread in data; each symbol represents the mean feeding time for 10 polyps. Closed symbols equal response to brine shrimp homogenate supernatan
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 154 MARCIA J. LOEB AND RICHARD S. BLANQUET LU h- LiJ CO ~Z. o Q_ CO LiJ or o Q LJ LJ 60 50 40 30 20 10 T~. I0~': IO'12 10"" IO~IC IO'9 I0~8 IO'7 DOSE (MOLAR ITY) IO"6 IO"5 IO"4 IO'3 FIGURE 2. Differences in feeding response time as the concentration of feeding behavior stimulus is changed. Open symbols equal response to reduced glutathione. Bars represent the spread in data; each symbol represents the mean feeding time for 10 polyps. Closed symbols equal response to brine shrimp homogenate supernatant. Each symbol represents the mean feeding time for 10 polyps. Data spread omitted for clarity. The dose represents the approximate amino acid concentration of shrimp homogenate and the specific concen- trations of the glutathione solutions. high concentrations (about 10 G M amino acids or 13y of protein per ml of test solution) tentacle writhing, mouth opening, and tentacle stuffiing occurred simul- taneously. At somewhat lower concentrations (approximately IO"7 to 10~9 M amino acids) the onset of tentacle writhing was delayed for a few seconds after the polyps were introduced to the test solution. Mouth opening and tentacle stuffing took place from one to three minutes later. At even lower concentrations of extract (approximately 10 9 to 10 12 M amino acids), writhing began one to three minutes after exposure to the test solution, mouth opening one to 10 minutes after exposure, and tentacle stuffing 12 to 24 minutes after exposure. In con- trast, reduced glutathione elicited simultaneous tentacle writhing, mouth opening and tentacle insertion at all active concentrations. As shown in Figure 2, the feeding response time increases as the concentra- tion of extract increases, from a concentration of approximately 10 12 M amino acids to approximately 10~8 M amino acids, and then falls off to lower response times as the concentration of extract increases further. Similar curv
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
