Abstract
Abstract The joint action of mercury and lead on the discharge of antennule-inner ramus nerve of crayfish (Cambarus clarkii) has been studied by means of a multichannel record of electrophysiological signals. the results show: 1. When the concentration of mercury (Hg2+) in water is only half of the restricted concentration (0.1 ug1-1) but there is also 12.5 ug1--1 lead (Pb2+) present, the joint inhibition of the two heavy metallic ions on the discharge is much stronger than that of the restricted concentration of mercury present. the slope of a linear regressive equation which indicates the frequency of discharges (Fn/F1) and action time is < −0.08129 ± 0.00357 ms. Further, in a certain concentration range, the higher the concentration of lead (Pb2+), the inhibition is stronger. 2. When the concentration of lead (Pb2+) in water is only 1/2 of the restricted level (100 ug 1-1Pb2+), but when there is 0.025 ug1-1 Hg2+ present, the joint inhibition of the two heavy metal ions on the discharge is much stronger...
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