Browsing by Subject "Digestive gland"

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    Changes in lipid composition of different tissues of common octopus (Octopus vulgaris) during short-term starvation
    (Wiley, 2013-07-09) Cerezo Valverde, Jesús; Serra Llinares, Rosa M.; García García, Benjamín; Sánchez Morillo-Velarde, María Piedad; Biología Celular e Histología
    In this work, we study the variations in concentration (mg 100 g−1 dry weight) and total content (mg individual−1) of different lipid classes in muscle and the digestive gland of Octopus vulgaris during an 8-day starvation period. In all the samples analysed, polar lipids (PL) predominated in muscle (267.3–337.2 mg 100 g−1) compared with neutral lipids (66.9–104.7 mg 100 g−1). A significant positive tendency was observed in muscle for the content and concentration of monoglycerides as a consequence of starvation (P < 0.05). Furthermore, a higher cholesterol (CHO) content was detected in this tissue after the fourth day of starvation compared with the fed animals (P < 0.05). Neutral lipids predominated in the digestive gland (12 958–14 151 mg 100 g−1) compared with PL (3157–6517 mg 100 g−1), with triglycerides, free fatty acids and monoglycerides being the major lipid classes. The concentration of PL and monoglycerides showed a positive trend with starvation, while the triacylglycerol showed a negative tendency (P < 0.05). The results suggest that triglycerides and CHO are transported simultaneously from the digestive gland to the muscular tissues during starvation and the preferential use of PL and CHO during growth phases. It was estimated that lipids contributed 26% of the energy costs of the animals during starvation, mainly in the form of triglycerides from the digestive gland.
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    Morpho-histochemical study of the biological effects of sodium dodecyl sulphate on the digestive gland of the Portuguese oyster
    (Murcia : F. Hernández, 2000) Rosety, M.A.; Ribelles, A.; Rosety-Rodriguez, M.; Carrasco, C.; Ordóñez Muñoz, F.J.; Rosety, J.M.
    In the present work we have studied the effects on survival as well as histopathological and histochemical alterations on the digestive gland of the Portuguese oyster (Crassostrea angulata, Lmk.) induced by acute action of the anionic tensioactive Sodium Dodecyl Sulphate (SDS) at different concentrations (50, 100,200 and 400 mg/L). Firstly, the LC 50 at 96 h was found to be 136 mgL SDS. Secondly we calculated the exposure time required for 50% mortality of the specimens exposed to different concentrations, and thirdly we examined histopathological alterations (degenerative processes ranging from inflammatory responses to extreme vacuolation) and histochemical changes in the distribution of carbohydrates and proteins that appeared at each employed concentration. The degree of these alterations and the effects on survival were dependent upon the SDS concentration. The above established modifications indicate that exposure to SDS has a detrimental effect on oyster digestive gland, perturbing metabolic and nutritional functions, what may have some influence on oyster survival.