Intensity low, medium, high. Sperm of many species do not swim on straight trajectories but instead move in circles or helical paths 168 — Chemotactic signaling pathway in sea urchin sperm. Which of the test chemicals caused the strongest response? We have compared solutions to the dynamic equations Eqs.
Although maleic acid is also a strong attractant, it is a synthetic compound and is not known to be common naturally.
An alternate control could be a toothpick that was dipped in the Sperm Release Buffer only, and not into a test solution. This hyperpolarization triggers the opening of voltage-gated calcium channels and the membrane depolarizes again. We characterize a simple and general mechanism for chemotaxis in two dimensions that is motivated by recent experiments 9 — 11 If you wish to repeat any of the tests, simply re-use the toothpicks. This behavior is therefore robust and does not depend on fine-tuning of parameters. Use the pen to make from 1 to 5 small dots along the side of the toothpicks near the unsharpened ends, so that each toothpick has a unique marking i.