Abstract
In experiments on the ventral nerve photoreceptor cells in Limulus the transient absorption changes of the intracellularly pressure-injected calcium indicator dye, Arsenazo III which were evoked by 10 ms intense light flashes were recorded at 645 nm together with the corresponding receptor potential. The Arsenazo signal provided a monitor of the intracellular calcium ion concentration during different experimental conditions. This two-phase recovery indicates the operation of two mechanisms regulating the sensitivity of the photoreceptor. Only the first phase seems to be strongly correlated with the decline of the intracellular calcium ion concentration.
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