. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 240 ALBERT D. CARLSON their concoinitantly reduced pseudofiashcs did not affect the intensity of immedi- ately following pseudoflashes induced after .short hypoxia. I )ISCUSSION The similarities bet \\ecn the adult and larval pseudoflashes, with respect to induction se(|uence. response to electrical stimulation and response to oxygen con- centration, surest that both utilize the same basic process. In both developmental forms, the pseudoflush appears to be the result of an accumulation of light-producing substance and its ra
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 240 ALBERT D. CARLSON their concoinitantly reduced pseudofiashcs did not affect the intensity of immedi- ately following pseudoflashes induced after .short hypoxia. I )ISCUSSION The similarities bet \\ecn the adult and larval pseudoflashes, with respect to induction se(|uence. response to electrical stimulation and response to oxygen con- centration, surest that both utilize the same basic process. In both developmental forms, the pseudoflush appears to be the result of an accumulation of light-producing substance and its rapid oxidation by the inrushing oxygen. _„—I l-. FIGURE 7. Effect of rapid alternation of 10% oxygen and nitrogen on the pseudoflash re- sponse of Plwtnris larva. Middle trace: heavy line. W< oxygen; narrow line, nitrogen. Lower trace: -timuhis, 4 volt-, 4(1 in-ec. duration. 10 per second frequency. Then- are a number of differences, however. between the responses ot the two forms. (I) Adults which are not Hashing immediately prior to anoxia can produce a pseudoflash without stimulation during the anoxic period. Non-glowing larvae must first be stimulated in some fashion during anoxia before a pseudoflash can be elicited. This might suggest that it is hypoxia alone which triggers the hypoxic glow in the adult. However, spontaneous neural activity invariably occurs prior to onset of the hypoxic glow in the adult, as observed by Carlson (1962). The need to stimulate the larva then perhaps reflects a relative lack of spontaneous neural activity. (2} The adult can maintain a glow in nitrogen for several minutes, indicating that oxygen is still available for the light reaction. The larva is apparently com- pletely deoxygenated within 15 seconds in nitrogen because stimulation induces no glow after that period as anoxia continues However, the anoxic larval photo- cytes are still responsive to electrical stimulation because stimulation initiated after the first 15 seconds of the
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
