R F Stump

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Xenopus neural crest cells migrated toward the cathode in an applied electrical field of 10 mV/mm or greater. This behavior was observed in relatively isolated cells, as well as in groups of neural crest cells; however, the velocity of directed migration usually declined when a cell made close contact with other cells. Melanocytes with a full complement of(More)
We have explored the pattern of electrical currents generated by single cells of the water mold Blastocladiella emersonii at several stages of its life cycle. Extracellular currents were measured with a vibrating probe constructed after the design of Jaffe and Nuccitelli [Jaffe, L. F. & Nuccitelli, R. (1974) J. Cell Biol. 63, 614-628]. In growing cells(More)
An extracellular vibrating electrode has been used to investigate epithelial current production by Xenopus neurulae. Xenopus neurulae, in 5% DeBoer (DB) solution, stages 14-22, generated an endogenous current which left the blastopores of the embryos, and entered all other locations. The inward current declined near the mid line of the neural groove in(More)
We describe here experiments which reveal a new physiological specialization in the endplate (synaptic) region of skeletal muscle fibres. Using a vibrating microelectrode which can detect small currents flowing in extracellular fluid, we have found that the membrane in the endplate region behaves as though a steady positive current is generated in this(More)
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