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Updated: Aug 9, 2026

Two Types of Assays for Detecting Frog Sperm Chemoattraction
Published on: December 27, 2011
Summarizing the motion of self-propelled cells: applications to sperm motility
D B Dunson1, C R Weinberg, S D Perreault
1Biostatistics Branch, NIEHS, Research Triangle Park, North Carolina 27709, USA. dunson1@niehs.nih.gov
Abstract:
Proper characterization of the motion of spermatozoa is an important prerequisite for interpreting differences in sperm motility that might arise from exposure to toxicants. Patterns of sperm movement can be extremely complex. On the basis of an exponential model that relates the discretely approximated curvilinear velocity to the tracking rate, we develop a statistic that indexes the predictability of the path for individual sperm. We summarize the path of each sperm using this and two other statistics: (1) the path displacement velocity and (2) linearity of movement. We apply the method to a set of rat sperm tracks representative of both normal and abnormal motion characteristics.
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