. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. HOURS FROM OVIPOSITION 14 12 10 08 06 04 00. HOURS FROM OVIPOSITION Figure 3. Distribution coefficients for (A) strontium and (B) mag- nesium for indicated treatments (mean ± , n = 3-6). reared in the presence of strontium (0 and 8 ppm Sr, Figs. 4A, B). Staining intensified in both treatments as devel- opment progressed, encompassing the velum, mantle, and the statoliths (8 ppm Sr) or the empty statocyst cavi- ties (0 ppm Sr). Exposure to beryllium ( ppm), a potent in- hibitor of alkaline phosphatase (Aldridge,
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. HOURS FROM OVIPOSITION 14 12 10 08 06 04 00. HOURS FROM OVIPOSITION Figure 3. Distribution coefficients for (A) strontium and (B) mag- nesium for indicated treatments (mean ± , n = 3-6). reared in the presence of strontium (0 and 8 ppm Sr, Figs. 4A, B). Staining intensified in both treatments as devel- opment progressed, encompassing the velum, mantle, and the statoliths (8 ppm Sr) or the empty statocyst cavi- ties (0 ppm Sr). Exposure to beryllium ( ppm), a potent in- hibitor of alkaline phosphatase (Aldridge, 1950; O'Day, 1972), resulted in abnormalities of the embryonic shell and statoliths similar to those observed for strontium- deprived organisms (Fig. 4C). Nevertheless, this metal ion ( ppm) did not attenuate alkaline phosphatase activity as measured biochemically (Fig. 4D), nor was the measured activity diminished in organisms from 0 ppm Sr. synthesis The presence of strontium had no effect on mucopoly- saccharide synthesis as indicated by histochemical analy- sis, despite the failure of the organic shell to tan in those animals from the basal medium. Whole specimens from both the 0 and 8 ppm Sr treatments stained darkly with ruthenium red during embryogenesis; the indicator ap- peared evenly dispersed throughout the soft tissue, the organic matrix, and the egg strand. Differential staining with alcian blue and aldehyde fuchin demonstrated the presence of highly sulphated mucopolysaccharides and an absence of the acidic forms; again no differences were detected in embryos from the 0 and 8 ppm Sr treatments. No morphological abnormalities of the organic shell of embryos from the 0 ppm Sr treatment were observed upon examination of thick sections using light micros- copy. Discussion The marine protozoa Acanlharia spp., the only other organisms known to require strontium, use the element for the formation of their SrSO4 tests (Anderson, 1981). Paradoxical
Size: 1902px × 1313px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
