. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 282 B. N. BURKETT AND H. A. SCHNEIDERMAN Spiracular valve responses of intact intubated pupae to gas perfusions It was necessary to know how the spiracular valves of intubated pupae that had not undegone surgery responded to various mixtures of carbon dioxide and oxygen. Thus pupae were perfused with gas mixtures in which the concentration of oxygen varied between 2 and 50%, and that of carbon dioxide ranged from 0 to 7%. Records of valve behavior under these conditions were obtained for I .U., ..... I I. .^11 I Is FIGUR
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 282 B. N. BURKETT AND H. A. SCHNEIDERMAN Spiracular valve responses of intact intubated pupae to gas perfusions It was necessary to know how the spiracular valves of intubated pupae that had not undegone surgery responded to various mixtures of carbon dioxide and oxygen. Thus pupae were perfused with gas mixtures in which the concentration of oxygen varied between 2 and 50%, and that of carbon dioxide ranged from 0 to 7%. Records of valve behavior under these conditions were obtained for I .U., ..... I I. .^11 I Is FIGURE 6. Spiracular valve responses to simultaneous spiracular and ganglionic per- fusions following detracheation of the fourth abdominal ganglion. The large arrow at the beginning of each record indicates the amount that the pen was deflected when valves opened fully. The short arrows below the tracings indicate the beginning (upward-pointing arrows) and end (down-pointing arrows) of recording. The short breaks in recording represent the time required to bring the next valve in focus (chart speed — mm/sec; each division on the chart represents 50 seconds) ; 3RAS, 4RAS, 5RAS—third, fourth, fifth right abdominal spiracle, respectively; (A.) Spiracular flow—50% O» + 3% CO2; ganglionic flow— 3% Oa + 3% CO*; (B.) Spiracular flow—3% O2 + 3% CO2; ganglionic flow—3% O2 + 3% CO.; (C.) Spiracular flow—21% Os + 3% CO.; ganglionic flow—3% O, + 3% CO2; (D.) Spiracular flow—3% O2 + 3% CO,; ganglionic flow—21% O» + 3% each pupa, and served as a type of control record for subsequent experimental records for that same pupa. The following results were obtained : In 61 of 101 perfusions of 2 to 5% O2 and 0 to 4% CO2, valves opened; in the 50 other perfusions, valves fluttered at high amplitude. Since the concentra- tion of carbon dioxide in all perfusions was too low to cause opening (Levy and Schneiderman, 1966a), the wide opening of the valves was a response to low
Size: 2023px × 1236px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
