. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FIGURE 3. Phagocytes with engulfed intact and digested trephocytes; from whole-blood preparations; camera lucida ; 1650 X. The uptake of trephocytic matter and the engulfment and digestion of living elements cannot be considered as phagocytosis in the accepted sense, which usually implies ingestion of noxious substances to be eliminated from the organism. It represents a normal way of nutrition for the phagocytes, and the phagocytosis of live trephocytes— This, of course, should not imply that the phago- cytes d
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FIGURE 3. Phagocytes with engulfed intact and digested trephocytes; from whole-blood preparations; camera lucida ; 1650 X. The uptake of trephocytic matter and the engulfment and digestion of living elements cannot be considered as phagocytosis in the accepted sense, which usually implies ingestion of noxious substances to be eliminated from the organism. It represents a normal way of nutrition for the phagocytes, and the phagocytosis of live trephocytes— This, of course, should not imply that the phago- cytes do not ingest matter destined for elimination, like dead cells, bacteria, or in- troduced foreign substances. DISCUSSION Previous studies on trephocytes (Liebman, 1946, 1947) have revealed that formed matter liberated by them is taken up by a variety of cells : oocytes, phagocytes and epithelial cells. This led to the conclusion that, in addition to chemical sub- stances, the animal cell depends also on biological elements for nutrition. The present, as well as some earlier observations, impel us to extend this no- tion further, by putting forward the idea that cannibalism apparently represents a normal process of cellular nutrition. Uptake and digestion of whole trephocytes by the growing ovarian eggs are ap- parently common among invertebrates. In some cases (Tubularia) the trephocytes - In the few instances where this term has been applied to cells, it is used both in a strict sense to denote ingestion of living elements by their own kind, as well as in cases where the phagocytosed cells are merely-of the same orgasism. We propose to apply this term in the latter sense to all cases where a cell ingests and digests any other living cell of the same 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 work.
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
