. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 78 S. A. GUTTMAN E- 2 u u CL, fc c U D 160 140 120 100 80 60 40 20 0 U g-20 —40. I I I 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 TIME IN MINUTES FIG. 3. Curve showing frequency <if Liinuhts heart bathed by the sea water which surrounded cardiac, .smooth, and striated muscle dnrinsr radiation, •fre- quency; cardiac radiation of cardiac muscle; smooth radiation of smooth muscle; striated radiation of striated muscle. DISCUSSION It appears that an accelerator substance' may he- produced upon irradiation of Limulus mus
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 78 S. A. GUTTMAN E- 2 u u CL, fc c U D 160 140 120 100 80 60 40 20 0 U g-20 —40. I I I 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 TIME IN MINUTES FIG. 3. Curve showing frequency <if Liinuhts heart bathed by the sea water which surrounded cardiac, .smooth, and striated muscle dnrinsr radiation, •fre- quency; cardiac radiation of cardiac muscle; smooth radiation of smooth muscle; striated radiation of striated muscle. DISCUSSION It appears that an accelerator substance' may he- produced upon irradiation of Limulus muscle. ITinrichs and Genther (1930) state that '" no change in rate of heat of the entire heart could he demon- strated by direct exposure of the he-art muscle ; Tt is possible that their negative results can hi- explained by their use- of point radia- tion. Guttman (1935 and I'^iiM has presente-d e-vide-nce- which indicates the probability of a potassium-calcium shift induced by ultra- violet radiation. This shift, however, probably is not responsible for the frequency changes observed. Guttman (1936fi) state-s, " It may be- suppoM-d. in the case of the Limulus heart, that the- primary action of the radiation | ultraviolet | is to increase the frequency of the- nerve cell discharge--, and also to increase the number of active- nerve cells; hence the number of nerve libers transmitting impulses to the myocardium is increased. The former supposition would account for the increased frequency, the latter for the increased ;. 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, Al
Size: 1862px × 1341px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
