Ricardo Guerra

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The skin histology of Clarias gariepinus, a scaleless teleost from south central Africa, is described. The African catfish epidermis is composed of epithelial cells representing 62.3% of volumetric density (Vv), club cells (Vv = 25.7%), mucous cells (Vv = 10.5%) and melanocytes (Vv = 1.4%). Its thickness amounts to approximately 240 microm. The dermis is(More)
Absorption of lipids by the enterocytes of Notothenia coriiceps, an omnivorous Antarctic and subAntarctic fish, was studied by light and electron microscopy. The lipids are absorbed by the anterior and middle intestine segments. They appear as fat droplets that measure from 0.5 to 7 μm of diameter and which accumulate in the apical cytoplasm within the(More)
Feeding rats with 4 g/kg body weight of sardine oil during 7 or 14 days increases the content of eicosapentaenoic acid and docosahexanoic acid in the erythrocyte and hepatic microsomal membranes by 2 to 6%. These membranes show increased susceptibility to the induction of oxidative stress, expressed as lipid peroxidation, when they are exposed to(More)
The growth factor progranulin (granulin-epithelin precursor, PC-derived growth factor or acrogranin) regulates proliferation and migration and is implicated in cancer, development, wound repair and neurodegenerative diseases. Under most conditions fibroblasts do not express progranulin in vivo, however its expression is activated following wounding. We(More)
Nutritional substances associated to some hormones enhance liver regeneration when injected intraperitoneally, being denominated hepatotrophic factors (HF). Here we verified if a solution of HF (glucose, vitamins, salts, amino acids, glucagon, insulin, and triiodothyronine) can revert liver cirrhosis and how some extracellular matrices are affected.(More)