1. 1. Decreased staining intensity with the Alcian Blue-Alcian Yellow technique for neurosecretory material led to a reduction in the visible numbers of Yellow Cells and Yellow-green Cells in brains from snails exposed to deionized water for more than 2 days. compared with snails from standard tapwater. 2. 2. A significant drop in blood Na+and Cl-concentrations preceded the histological change in Yellow Cell and Yellow-green Cell appearance. 3. 3. A significant drop in blood volume only occurred after 4 days exposure to deionized water, rather delayed with respect to the above histological and physiological changes. © 1978.
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