Abstract
Histochemical studies on the oxidative enzymes, NAD- and NADP-dependent isocitrate (IDH) and malate (MDH) dehydrogenases, succinic dehydrogenase (SDH), and cytochrome oxidase of the cheliped muscle of Scylla serrata (Forskål) indicated that their concentrations are relatively lower than those of vertebrate muscle. The site of action of various oxidative enzymes is found to be common in the component fibres varying in diameter. The sarcolemma generally exhibited stronger positive reactions for the enzymes than the sarcoplasm. The bilateral removal of eyestalks had a stimulatory effect on the activity of oxidative enzymes. Initially increased activity of SDH, IDH and MDH (NAD-linked) and cytochrome oxidase 2–4 h after eyestalk removal was found to be maintained after 24 h; a noticeable increase in the NADP-linked MDH was also apparent by this time. The eyestalk extract when injected into de-stalked animals, caused a decrease in the levels of SDH, NAD-linked IDH and MDH, and cytochrome oxidase. Biochemical estimations of SDH clearly indicate that bilateral eyestalk extirpation results in remarkably enhanced enzyme activity; conversely, the administration of eyestalk extract brings about a sharp decline in the enzyme concentration. Thus, it seems that the eyestalks may contain a factor regulating oxidative metabolism.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Journal of Experimental Marine Biology and Ecology
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
