. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 528 Z. M. FUZESSERY AND J. J. CHILDRESS n-butyric acid) or dicarboxylic (, L-glutamic and L-aspartic acid) amino acids, indicating the presence of at least two general classes of receptors. Responses to both groups of amino acids in a given preparation was more commonly encountered, but these responses generally appeared to be the product of a greater number of receptor units in the recorded population, implying that both receptor types may have been present, or that there are also receptors with broader specificities. O
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 528 Z. M. FUZESSERY AND J. J. CHILDRESS n-butyric acid) or dicarboxylic (, L-glutamic and L-aspartic acid) amino acids, indicating the presence of at least two general classes of receptors. Responses to both groups of amino acids in a given preparation was more commonly encountered, but these responses generally appeared to be the product of a greater number of receptor units in the recorded population, implying that both receptor types may have been present, or that there are also receptors with broader specificities. Of 19 preparations selected for consistency of response to given amino acids throughout a test series, 11 responded maximally to either mono- or dicarboxylates. All 11 are medial flagellum preparations. Figure 1 represents the average number of impulses per second elicited by four preparations responding maximally to monocarboxylates (A) and seven to dicarboxylates (B). The averages are a pooling of responses to glycine and DL-alpha amino-n-butyric acid, and to L-aspartic acid and L-glutamic acid. As also indicated (Fig. 1A and B), taurine, a sulfur-substituted amino acid, activated both receptor types but appeared to be more stimulatory to receptors responding maximally to dicarboxy- lates. Figure 2 illustrates examples of recordings from two antennular preparations from which these data were calculated. Gnathophausia ingens—chemoreceptive acuity. Dactyl and antennal receptors were tested for responses to mixture concentrations ranging from X 10~2 M to 5 X 10~10 M. The response threshold of dactyl receptors was 6 X 10~8 M, that of the antennae 5 X 1O7 M. In both appendages, response intensity and duration increased with concentration. Responses to 1O6 M generally adapted within 15 25 20 o UJ \ 15 UJ ID 0- 0. 234 TIME (SEC). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
