. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 210 FRANK P. KNOWLTON effects were those of single stimuli and quick contractions appeared either singly or as saw-toothed notching on a slowly rising tonus contraction (Fig. 2A). With frequencies around 10 per second or higher, the slow contraction always appeared first as intensity was increased from sub- liminal values and changed to the quick type with further increase of intensity. On slow contractions as they developed or relaxed, quick contractions could be superimposed by application of single stimuli of proper inten
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 210 FRANK P. KNOWLTON effects were those of single stimuli and quick contractions appeared either singly or as saw-toothed notching on a slowly rising tonus contraction (Fig. 2A). With frequencies around 10 per second or higher, the slow contraction always appeared first as intensity was increased from sub- liminal values and changed to the quick type with further increase of intensity. On slow contractions as they developed or relaxed, quick contractions could be superimposed by application of single stimuli of proper intensity or by brief repetitive stimuli of greater strength or FIG. 2. A. Blue crab adductor stimulated by increasing intensity of repetitive induced currents (Harvard induction coil). Signal indicates stimulation frequency (4 to 6 per sec.). Time = sec. B. Rhythmic quick contractions of lobster adductor stimulated directly by weak tetanizing current (vibrator). Time = sec. C. Spider crab adductor stimulated at rate of 11 per sec. The slight irregulari- ties are due to variations in output of stimulator. Signal indicates stimulation fre- quency. Time = sec. D. Same preparation as C. Stimulation rate 14 per sec. Time = sec. E. Blue crab adductor stimulated repetitively (vibrator) through its nerve with secondary induction of coil at 8 cm. and 6 cm. Lines drawn from crests of the curves indicate differences in time of slow and quick contractions. Time = % sec. F. Blue crab preparation as in E shows the development of quick and slow contractions in the same curve. Strong stimulus. Time = % 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 original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947;
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
