. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 472 RONALD R. NOVALES AND BARBARA J. NOVALES units/ml, produced marked darkening, this concentration was chosen for further experiments on factors influencing the response. Urea was not required for the response. Thus, S-MSH at 10 units/ml, gave a A of 28 ± 2 (2) in urea- free Ringer. The numbers of skins are in parentheses. The effects of a number of osmotic and ionic variables on the response of Sqnaliis skin are given in Table I. There was a very uniform response in Ringer. ID E o c o _> D O g LU —I LJ_ LU CXL z L
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 472 RONALD R. NOVALES AND BARBARA J. NOVALES units/ml, produced marked darkening, this concentration was chosen for further experiments on factors influencing the response. Urea was not required for the response. Thus, S-MSH at 10 units/ml, gave a A of 28 ± 2 (2) in urea- free Ringer. The numbers of skins are in parentheses. The effects of a number of osmotic and ionic variables on the response of Sqnaliis skin are given in Table I. There was a very uniform response in Ringer. ID E o c o _> D O g LU —I LJ_ LU CXL z LU CO LU U LU O. MSH 100 (U/ml.,Log Scale) FIGURE 1. Log dose-response curves of paled Squalus acanthias skin melanophores to various types of MSH. Exposure was one hour. Points are means. (•) standard MSH, 24 skins; (O) syn. a-MSH, 36 skins; (£>) /VMSH, 14 skins. The sodium content of skin freshly removed from the fish was 753 ± 49 (4) mM/kg. dry wt, which is not significantly different from that found after main- tenance in Ringer for hours, as given in Table I. This testifies to the good physio- logical qualities of the Ringer's solution used here. Bathing in hypotonic Ringer containing £ of normal Ringer sodium produced slight darkening, as seen in Table I. MSH produced a normal total darkening in the hypotonic Ringer (Table I). Hypotonic Ringer of ^ and f normal Ringer sodium produced no significant darkening alone, showing the resistance of dogfish. 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 Laboratory
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
