when crabs were transferred from 100% SW to 50% SW, branchial Na, K-ATPase ESA showed no significant increase until 3 d after transfer; ESA increased further between 10 and 14 d (Fig. 4). Thus, it is clear that long-term changes in salt uptake from the medium are associated
with increased activity of branchial Na, K-ATPase ESA measured in vitro under optimal conditions. This increased activity probably occurs by synthesis and incorporation of new enzyme into the basolateral membrane of the gill “ionocytes.” Branchial ionocyte proliferation (1,5) and increased Na, K-ATPase activity within the growing branchial ionocyte “patches” (20) have been reported in
when crabs were transferred from 100% SW to 50% SW, branchial Na, K-ATPase ESA showed no significant increase until 3 d after transfer; ESA increased further between 10 and 14 d (Fig. 4). Thus, it is clear that long-term changes in salt uptake from the medium are associatedwith increased activity of branchial Na, K-ATPase ESA measured in vitro under optimal conditions. This increased activity probably occurs by synthesis and incorporation of new enzyme into the basolateral membrane of the gill “ionocytes.” Branchial ionocyte proliferation (1,5) and increased Na, K-ATPase activity within the growing branchial ionocyte “patches” (20) have been reported in
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