. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 304 E. FRANCES BOTSFORD when the same frequency is used. A longer interval was allowed be- tween bursts in the case of the muscle strip preparation because the muscle strip required a longer period to recover its original state of tension after each response. To investigate the characteristics of the " staircase " effect exhibited by these muscles, many series of responses were recorded showing the. FIG. 3. Augmentation of contractions in whole worm preparation. Duration of burst, second. Interval between burst
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 304 E. FRANCES BOTSFORD when the same frequency is used. A longer interval was allowed be- tween bursts in the case of the muscle strip preparation because the muscle strip required a longer period to recover its original state of tension after each response. To investigate the characteristics of the " staircase " effect exhibited by these muscles, many series of responses were recorded showing the. FIG. 3. Augmentation of contractions in whole worm preparation. Duration of burst, second. Interval between bursts, 7 seconds. Frequency, 28 shocks per second. FIG. 4. Augmentation of contractions in muscle strip. Duration of burst, second. Interval between bursts, 27 seconds. Frequency, 28 shocks per second. Drum stationary. FIG. 5. Effect of frequency of stimuli within burst on augmentation of con- tractions. Whole worm preparation. Duration of burst, second. Interval be- tween bursts, 7 seconds. Frequency of stimuli: A, E, G, 28 shocks per second causes augmentation; B, 9 shocks per second; C, 14 shocks per second; D, F, 18 shocks per second. effect upon the augmentation phenomenon of four easily variable condi- tions : the intensity of the stimulating current, the duration of the bursts of stimuli, the interval between the bursts, and the frequency of the stimuli within the bursts. It should be noted that in some instances it is impossible to make exact quantitative statements which apply to all. 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; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological
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