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Characterization of the Mineral Phosphate-Solubilizing Activity of Pantoea aglomerans MMB051 Isolated from an Iron-Rich Soil in Southeastern Venezuela (Bolívar State)
The mineral phosphate-solubilizing activity of a Pantoea agglomerans strain, namely MMB051, isolated from an iron-rich, acidic soil near Ciudad Piar (Bolívar State, Venezuela), was characterized on a chemically defined medium (NBRIP) and proton release by ammonium (NH4+) fixation appeared to be of paramount importance to explain inorganic-P solubilization. Expand
Ferutinin stimulates nitric oxide synthase activity in median eminence of the rat.
Results showed that this compound is able to increase nitric oxide synthase activity and inositol monophosphate accumulation in the median eminence of the rat brain, suggesting that compound (1) is associated to the activation of phosphoinositide breakdown and Nitric oxide production. Expand
Structural features of an arabinogalactan gum exudates from Spondias dulsis (Anacardiaceae).
Application of chemical methods, in combination with 1D and 2D NMR spectroscopy afforded interesting structural features of the gum polysaccharide, including the unequivocal presence of rhamnose in the polymer structure. Expand
Isolation and characterization of (+)-mellein, the first isocoumarin reported in Stevia genus
From the acetone extract obtained of leaves and stems of Stevia lucida Lagasca were isolated the following phenolic derivatives: (+)-mellein (1), hispidulin (2), pectolinaringenin (3) andExpand
Role reversal in the cyclocondensation of cyclopentadiene with heterodienophiles derived from aryl amines and aldehydes: synthesis of novel tetrahydroquinolines
Abstract Immonium ions derived from aryl amines and aldehydes function not as heterodienophiles but rather as heterodienes in the presence of cyclopentadiene giving rise to novel tetrahydroquinolines.
Molecular mechanism for the denaturation of proteins by urea.
The results support a direct interaction between urea and protonated histidine as the initial step for protein inactivation followed by hydrogen bond formation with polar residues, and the breaking of hydrophobic collapse as the final steps for protein denaturation. Expand