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The electrical potential gradient of regenerating tubularia spatial and temporal characteristics

, : The electrical potential gradient of regenerating tubularia spatial and temporal characteristics. Growth 42(3): 347-356

In regenerating Tubularia, a reproducible pattern of surface potentials is correlated with the site of morphogenesis throughout development. The location, magnitude and direction of potential differences of regenerating stems were recorded by a method in which surface potentials were measured under oil. Control experiments established that the measurement procedure did not damage the organism and that the potentials being measured were produced by viable cells. During the early phase of development an electro-negative potential was detectable approximately 5 mm from the distal end of the stem, and each point closer to that end was progressively more negative than the previous point. A continuous electro-negative potential gradient (ENPG) existed across the several mm in which a primordium was forming. The ENPG was reproducibly measurable from hour to hour and persisted or increased significantly during early development until it became discontinuous when tentacles began to develop within the primordium. The ENPG is located in an appropriate region during early development to influence the determination of axial polarity in this organism.

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