. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. EXCYSTMENT REACTIONS AND ABSENCE OF OXYGEN 385 bubbling through an acid chromous sulphate solution (M/10 pH = 2). The reduced state of the solution was maintained by the presence of amalgamated zinc prepared according to the methods of Stone and Beeson (1936). Gas exchange with the solution was facili- tated by use of a sintered glass bubbler which broke up the gas stream into very small bubbles. After the air was washed out of the excyst- ment chamber with this nitrogen and sufficient time elapsed so that equi- librium betw
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. EXCYSTMENT REACTIONS AND ABSENCE OF OXYGEN 385 bubbling through an acid chromous sulphate solution (M/10 pH = 2). The reduced state of the solution was maintained by the presence of amalgamated zinc prepared according to the methods of Stone and Beeson (1936). Gas exchange with the solution was facili- tated by use of a sintered glass bubbler which broke up the gas stream into very small bubbles. After the air was washed out of the excyst- ment chamber with this nitrogen and sufficient time elapsed so that equi- librium between the gaseous and liquid phase was approached, then ex- cystment solution which had been de-oxygenated was added. There 350 300 c/) Ld h- z 250 ill 200 150 100. LITERV'GRAM 5 10 15 20 RECIPROCAL CONCENTRATION FIG. 2. Excystment of Colpoda at 20° C. O, two control series; A, oxygen tension = 15 mm. Hg. were no signs of excystment for periods of as long as 25 hours, though at 15 mm. Hg partial oxygen pressure, excystment at 20° C. would have been completed in two to three hours. The data demonstrate much more than just a prevention of excyst- ment by absence of oxygen, for upon admittance of air, normal excyst- ment ensued; and further, the excystment time following the block was found to be independent of the duration of the block, independent of the concentration of the excystment solution, and equal in length to the period that was found from studies on relation between concentration. 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 Laborato
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
