. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. O, CONSUMPTION BY BACTERIA IN LAKE WATER 391 thermo-sensitive bacteria or their enzymes and is not due to a lack of either oxidant or oxygen. According to Edwards and Rettger (1937) the respiratory enzymes of bacteria are especially thermo-sensitive, many being destroyed at relatively low temperatures. Similarly ZoBell and Conn (1940) have shown that prolonged exposure to temperatures ex- ceeding 25° C. is injurious to many water bacteria and that the respira- tory enzymes of some are destroyed in 10 minutes at 30° C. Influe
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. O, CONSUMPTION BY BACTERIA IN LAKE WATER 391 thermo-sensitive bacteria or their enzymes and is not due to a lack of either oxidant or oxygen. According to Edwards and Rettger (1937) the respiratory enzymes of bacteria are especially thermo-sensitive, many being destroyed at relatively low temperatures. Similarly ZoBell and Conn (1940) have shown that prolonged exposure to temperatures ex- ceeding 25° C. is injurious to many water bacteria and that the respira- tory enzymes of some are destroyed in 10 minutes at 30° C. Influence of Oxygen Tension According to Amberson (1928) the rate of oxygen consumption by unicellular organisms is independent of the oxygen tension over a wide OXYGEN MGM/_. TIME IN HOURS FIG. 1. Oxygen consumed after different periods of time at 8°, 18°, 25° and 37° C. by lake bacteria (resting cells) in lake water enriched with per cent each of glucose and asparagine. range. Similarly Putter (1924), Harvey (1928), Pomeroy (1938) and others report that the rate of oxygen uptake by bacteria is not influenced by the oxygen tension. However, Waksman and Carey (1935), Heukelekian (1936), Schlayer (1936) and others find that the rate of oxygen consumption by certain bacteria is proportional to the oxygen tension. These antithetical observations may be due to varia- tions in experimental procedure. For example, Kempner (1937) finds that at relatively low temperatures or with old cells the respiration of Escherichia coli is independent of the oxygen tension, but when using. 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
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
