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- W2008985771 abstract "The change in the flagellar waves of spermatozoa from a tunicate and sea urchins was examined using high-speed video microscopy to clarify the regulation of localized sliding between doublet microtubules in the axoneme. When the tunicate Ciona spermatozoa attached to a coverslip surface by their heads in seawater or they moved in seawater with increased viscosity, the planar waves of the sperm flagella were converted into left-handed helical waves. On the other hand, conversion of the planar waves into helical waves in the sea urchin Hemicentrotus spermatozoa was not seen in seawater with an increased viscosity as well as in ordinary seawater. However, the sea urchin Clypeaster spermatozoa showed the conversion, albeit infrequently, when they thrust their heads into seawater with an increased viscosity. The chirality of the helical waves of the Clypeaster spermatozoa was right-handed. When Ciona spermatozoa swam freely near a glass surface, they moved in relatively large circular paths (yawing motion). There was no difference in the proportion of spermatozoa yawing in either a clockwise or counterclockwise direction when viewed from above, which was also different from that of the sea urchin spermatozoa. These observations suggest that the planar waves generally observed on the sperm flagella are mechanically regulated, although their stability must depend on the Ca2+ concentration in the cell. Furthermore, the chirality of the helical waves may be determined by the intracellular Ca2+ concentration and changed by transmitting the localized active sliding between the doublet microtubules around the axoneme in an alternative direction." @default.
- W2008985771 created "2016-06-24" @default.
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- W2008985771 date "2012-01-01" @default.
- W2008985771 modified "2023-09-27" @default.
- W2008985771 title "Mechanical Constraint Converts Planar Waves into Helices on Tunicate and Sea Urchin Sperm Flagella" @default.
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- W2008985771 doi "https://doi.org/10.1247/csf.11019" @default.
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