15 research outputs found
Desempenho produtivo de vacas de quatro grupos genéticos submetidas a diferentes manejos alimentares desmamadas aos 42 ou 63 dias pós-parto
Activation of δ-Aminolevulinic Acid Dehydratase Following Donation of Zinc from Kidney Metallothionein
Effects of 17 alpha-methyltestosterone on uterine morphology and heat shock protein expression are mediated through estrogen and androgen receptors.
Effects of beta-estradiol and bisphenol A on heat shock protein levels and localization in the mouse uterus are antagonized by the antiestrogen ICI 182,780
Chemical and Physical Properties of Processed Newspaper Compared to Wheat Straw and Wood Shavings as Animal Bedding
Isolation and Identification of Arsenic-Transforming Bacteria from Arsenic Contaminated Sites in Bulgaria
Influence of temperature on the digestibility of the tropical legume Macroptilium atropurpureum
Lead‐induced developmental perturbations in hippocampal Sp1 DNA‐binding are prevented by zinc supplementation: in vivo evidence for Pb and Zn competition
Cadmium-Binding Proteins in Rat Testes: Characterization and Apparent Source of the Low-Molecular-Weight Protein
Alterações histológicas em brânquias de tilápia nilotica Oreochromis niloticus causadas pelo cádmio Histological alterations in gills of Nile tilapia Oreochromis niloticus caused by cadmium
Os efeitos histopatológicos do cádmio nas brânquias de tilápia Oreochromis niloticus foram estudados por microscopia óptica, usando 25mgl-1 de CdCl2 durante quatro dias, com o objetivo de identificar seus efeitos agudos na estrutura das brânquias. A morfologia geral das brânquias de O. niloticus é idêntica à de outros teleósteos, apresentando quatro pares de arcos branquiais com filamentos bem desenvolvidos. Situadas lateralmente, encontram-se as lamelas provenientes do eixo central dos filamentos. No epitélio filamentar foi possível identificar células de cloro, pavimentosas e mucosas. Os peixes expostos ao cádmio mostraram sinais de lesões epiteliais; edema intersticial, vasodilatação das lamelas, destacamento do epitélio lamelar e proliferação do epitélio filamentar. As alterações observadas também incluíram fusão nas lamelas como resultado de hiperplasia e hipertrofia epitelial, ruptura do sistema de células pilar, aneurismas e necroses.<br>The histopathogical effects of cadmium on the gills of tilapia Oreochromis niloticus were studied by light microscopy, using 25mgl-1 of CdCl2 during four days to identified the effects of short-term exposure on gills structure. The general morphology of O. niloticus gills is similar to the other teleostean fishes, showing four pairs of gills arches with well developed filaments. Bilaterally situated, secondary lamellae branches are found from the central axis of the filaments. The filamentar epithelium showed the chloride cells, the pavement cells and mucous cells. Fish exposed to cadmium showed signs of epithelial lesion, namely the interstitial edema, swollen of the lamellae, lifting and cellular proliferation of the filamentar epithelium. The changes of the gills also included lamellar fusion as a result of epithelial hyperplasia and hypertrophy, the breakdown of pillar cell system, and aneurisms with some ruptures and necrosis, especially in the filamentar epithelium