. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 2 4 6 8 10 12 NUMBER OF CELLS ASW ORNITHINE NITRO-ARCININE ARGININIC ACID CITRULLINE LYSINE NORVALINE HOMOARGININE NORLEUCINE VALINE ISOLEUCINE LEUCINE HETHYL-ARCININE ARGININE ARGININE-HCL. 0 200 400 600 800 1000 TOTAL NUMBER OF SPIKES Figure 5. Stimulatory effectiveness of single test compounds and ASW on arginine-sensitive cells in medial antennular filaments from Homarus americanus. A. Number of cells which responded with one or more spikes to each compound. B. Total number of spikes elicited by each compound (all spikes
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 2 4 6 8 10 12 NUMBER OF CELLS ASW ORNITHINE NITRO-ARCININE ARGININIC ACID CITRULLINE LYSINE NORVALINE HOMOARGININE NORLEUCINE VALINE ISOLEUCINE LEUCINE HETHYL-ARCININE ARGININE ARGININE-HCL. 0 200 400 600 800 1000 TOTAL NUMBER OF SPIKES Figure 5. Stimulatory effectiveness of single test compounds and ASW on arginine-sensitive cells in medial antennular filaments from Homarus americanus. A. Number of cells which responded with one or more spikes to each compound. B. Total number of spikes elicited by each compound (all spikes of all cells). tance of dactyl chemoreceptors became increased 7 to 10 days after antennule ablation (Hazlett, 1971). Narrowly tuned cells are a predominant feature of//. americanus lateral antennules (Johnson and Atema 1983) and legs (Derby and Atema 1982b; Johnson et ai, 1984). Similarly, many medial filament cells responded strongly to only one compound. Ten cells (four Hyp, four Tau, one Bet, and one NH4) responded exclusively to one compound (Fig. 2). An additional 14 cells re- sponded only weakly to other compounds (response to a second best compound was less than 30% of the cell's maximal response; Fig. 2). A comparison of H-metric values calculated from the present data and from lateral antennular filaments (data from Johnson and Atema, 1983), indicates that Hyp and Tau best cells are tuned similarly in the two filaments (Table II). The mean H- metric value for Hyp best cells in leg receptors, however, is higher than the values for antennular receptors, sug- gesting that as a population the former are more broadly tuned than the latter. Arg best cells had a relatively broad response spectrum and, in contrast to other H. americanus chemoreceptor cells, displayed a consistent order of responsiveness to stim- ulatory compounds. In our initial survey. Leu and Lys were always the second and third best stimuli, respectively. In our second experiment. Leu was less effective t
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