. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 444 STEVEN VOGEL since they do not entail immediate metabolic cost (Vogel and Bretz, 1972). The present investigation seeks to determine whether passive flow might be an appreciable factor in the lives of sponges. It should be noted that passive flow, while it may avoid metabolic expenditure, involves no novel source of energy. A potential exists between any two points where the velocity of the medium is different; where a potential exists, work may be extracted by an appropriate device. For an attached organism, the velocit
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 444 STEVEN VOGEL since they do not entail immediate metabolic cost (Vogel and Bretz, 1972). The present investigation seeks to determine whether passive flow might be an appreciable factor in the lives of sponges. It should be noted that passive flow, while it may avoid metabolic expenditure, involves no novel source of energy. A potential exists between any two points where the velocity of the medium is different; where a potential exists, work may be extracted by an appropriate device. For an attached organism, the velocity at the point of attachment is, of course, zero ; and it can extract energy from the flow of fluid around it just as does a windmill. At least three physical mechanisms permit the induction of flow in a spongelike structure by motion of the external medium (Fig. 1). (A) If a small pipe con- nects two points in a larger channel, and if the ends of the small pipe are normal to the walls of the channel, then fluid will flow in the small pipe from the end where flow in the channel is slower to the end where flow is more rapid (la). By (a) (b) (c). 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
