. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 30 60 90 120 150 l/S Figure 5. Enzyme proportionality and double reciprocal plots of APS reductase (left) and ATP sulfurylase (right). Both enzymes exhibit proportional activities, which increase linearly with the amount of added homogenate. Double reciprocal plots give ^^ax and apparent Kn, values of units/g and iiM for APS reductase and units/g and ^lM for ATP sulfurylase. brown pigment granules. Leaching of sulfur from the tissue, as indicated by reduction in size of the sulfur peak, occurred if the samp
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 30 60 90 120 150 l/S Figure 5. Enzyme proportionality and double reciprocal plots of APS reductase (left) and ATP sulfurylase (right). Both enzymes exhibit proportional activities, which increase linearly with the amount of added homogenate. Double reciprocal plots give ^^ax and apparent Kn, values of units/g and iiM for APS reductase and units/g and ^lM for ATP sulfurylase. brown pigment granules. Leaching of sulfur from the tissue, as indicated by reduction in size of the sulfur peak, occurred if the samples were processed with an acetone dehydration series and critical point drying. The aluminum peak seen in the elemental spectral scan is an artifact due to the aluminum stub on which specimens were mounted. Discussion The above results support the existence of bacterial endosymbionts in the gills of Lucina jloridana. Confinement of these bacteria to vacuoles within the eucaryotic cells (Fig. 1) is the same morphological arrangement recently reported by Cavanaugh (1983) for gram-negative, symbiotic bacteria in the marine bivalves Calyptogena magnifica, Solemya velum, and Lucinoma annulata and by Felbeck (1983) for Solemya reidi. With the exception of rhodanese (which can also serve as a detoxifying enzyme in certain eucaryotes; Sorbo, 1953), the enzymes that we have demonstrated in the gill tissue of L. floridana are normally characteristic of chemoautotrophic sulfur bacteria. RuBPCase and ATP sulfurylase activities have been measured in the tro- phosome tissue of the vestimentiferan tube worm Riftia pachyptila by Felbeck (1981),. 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; Li
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