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- W2018204939 abstract "Abstract The capacity of the mammalian liver microsomal P-450-dependent systems to metabolize a wide variety of endogenous and exogenous compounds is thought to reflect the presence of multiple forms of P-450 haemoproteins with broad and overlapping substrate specificity. In plants, the functions and specificity of cytochrome P-450 systems are less well known. This study was designed to prepare and characterize subcellular fractions from fresh sheaths (basal parts of leaves) of a mediterranean seagrass Posidonia oceanica (Linnaeus) Delile, the aim being the preparation of a microsomal fraction suitable for studying xenobiotic metabolism. The purity of the different fractions obtained by centrifugation, as well as the recovery of different organelles, was determined using enzyme markers (cytochrome c oxidase, alkaline phosphatase, glucose-6-phosphatase) and morphological examination by transmission electron microscopy. Some assays of enzymes involved in xenobiotic metabolism (cytochrome c reductase, laurate hydroxylase, ethoxyresorufin O-deethylase and glutathione-S-transferase) were also performed on different fractions of the preparation. The subcellular distribution for drug metabolism and marker enzymes showed a loss of endoplasmic reticulum in the pellet obtained after the first centrifugation, but the microsomal fraction was relatively free of mitochondria and fragments of the plasma membrane. Some assays are still being performed to avoid the small loss of endoplasmic reticulum experienced with the first pellet. However, the microsomes prepared in this study from sheaths of Posidonia oceanica appear suitable for further investigation of xenobiotic metabolism." @default.
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- W2018204939 date "1995-01-01" @default.
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- W2018204939 title "Preparation and characterization of subcellular fractions suitable for studies of xenobiotic metabolism from leaf sheaths of a marine seagrass: Posidonia oceanica (Linnaeus) Delile" @default.
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- W2018204939 doi "https://doi.org/10.1016/0141-1136(94)00037-p" @default.
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