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Showing 1 to 2 of 2 for “"Time lapse cinematography"”.
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The Biology of a Colonial Hydroid
… increase in hydranth number with a doubling time of about three days. Five ions — Na<sup>+</sup>, K<sup>+</sup>, Ca<sup>++</sup>, Mg<sup>++</sup>, Cl<sup>-</sup> — have been found to be required for growth in the defined aqueous environment, and other variables influencing growth rate have …