Abstract
Summary
Low concentrations of DNP did not stimulate respiration or affect motility of sea-urchin sperm suspended in sea water; high concentrations of DNP inhibited sperm respiration and motility, the inhibition of motility being reversible. Dinitrophenol stimulated the respiratory rate of sperm in the presence of Versene and caused respiration to be partially dissociated from motility. Versene, as compared with sea water, prolonged the motile life and respiration of sperm treated with high concentrations of DNP. Dinitrophenol and dilution have similar effects on sea-urchin sperm, raising the possibility that both act through similar mechanisms.
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