Spatially nonuniform changes in intracellular calcium ion concentrations.
The spatial variation of changes in intracellular calcium ions were studied with a one-dimensional scanning microphotometer. Changes in intracellular calcium were measured with a metallochromic dye, arsenazo III. Both the magnitude and the kinetics of changes in calcium were dramatically different in different regions of a cell. In Limulus ventral photoreceptors the maximum change was probably restricted to the rhabdomeric lobe.
D000818:Animals; D001150:Arsenazo III / Q000378:metabolism; D002118:Calcium / Q000378:metabolism*; D003600:Cytosol / Q000378:metabolism; D004058:Diffusion; D006737:Horseshoe Crabs / Q000378:metabolism*; D007700:Kinetics; D008027:Light; D010786:Photoreceptor Cells / Q000378:metabolism*; D013053:Spectrophotometry
D001150:Arsenazo III; D002118:Calcium