Abstract
Among various kinds of tissue, the rate of respiration was the highest in the gills and very low in such tissues as the adductor muscle and outer epithelium adhering to the inner surface of shell (Table 1). The amount of oxygen consumption of the gills, measured at 25°C., was higher in winter than in summer (Table 2). The respiration of excised gill piece was blocked by cyanide, azide, αα'-dipyridil, salicylaldoxime and iodoacetate, and stimulated by methylene blue and 2, 4-dinitrophenol (Table 3, Fig. 1 & 2). The inhibition by salicylaldoxime seems to suggest that a copper enzyme might play an important role in the respiratory system of the gills as well as an iron enzyme, cytochrome oxidase, which has been previously proven by the writer.
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