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- W2074700923 abstract "Measurements were carried out on the effects of four inorganic phosphates on the rate of CaCO3 crystallization in vitro and on shell growth of the marine bivalve Rangia cuneata and the freshwater gastropod Helisoma duryi. The rate of in vitro crystallization was determined in inorganic artificial extrapallial fluids by measuring proton release as CaCO3 forms from Ca2+ and HCO3−. Concentrations of phosphates having a significant inhibitory effect on the rate of in vitro CaCO3 crystallization were as follows: sodium orthophosphate, 1.25 × 10−6 M (0.15 ppm); sodium hexametaphosphate, 3.6 × 10−8 M (0.015 ppm); tetrasodium pyrophosphate, 5.6 × 10−7 M (0.15 ppm); pentasodium tripolyphosphate, 4.1 × 10−7 M (0.15 ppm); and ATP 1.0 × 10−6 M. Sodium hexametaphosphate, tetrasodium pyrophosphate, and pentasodium tripolyphosphate were found to inhibit markedly the incorporation of 45Ca into the growing edge of Rangia during 24 h exposure. However, the concentrations required to produce a significant decrease in 45Ca deposition were four to six orders of magnitude greater than the concentration required to produce an effect on in vitro crystallization. Sodium orthophosphate was without effect on 45Ca deposition in Rangia at concentrations as high as 1500 ppm. Shell growth and mortality of Helisoma exposed to these four phosphates were followed during a 1-mth period. Pentasodium tripolyphosphate and tetrasodium pyrophosphate were the most inhibitory, causing a decreased growth rate and an increase in mortality at concentrations as low as 15 ppm. Fertilized eggs developed and hatched in all four phosphate compounds at 15 ppm and 150 ppm but did not develop in 1500 ppm of any compound." @default.
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- W2074700923 date "1985-10-01" @default.
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- W2074700923 title "Effects of phosphates on shell growth and calcium carbonate crystal formation" @default.
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- W2074700923 doi "https://doi.org/10.1016/0166-445x(85)90032-3" @default.
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