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Two different modes for copper(II) ion coordination to quinine-type ligands
Rey,Nicolás A.; Santos,Karina C. dos; Menezes,Maria Â. B. C.; Mangrich,Antonio S.; Pereira-Maia,Elene C.Three new copper(II) complexes with the ligands quinuclidine [Cu(C7H13N)2(OH2)Cl]Cl·2H 2O (1), quinine [Cu(C20H23O2N2)(OH 2)2]ClO4 (2), and hydroquinidine [Cu(C20H27O2N2)(OH 2) Cl2]Cl·½H2O (3) have been isolated and characterized. The binding sites were assigned on the basis of vibrational spectroscopy, electron paramagnetic resonance, and thermal analysis results. The possibility of the in...
Arrest in ciliated cell expansion on the bronchial lining of adult rats caused ...
Maria João R. Oliveira; António S. Pereira; Paula G. Ferreira; Laura Guimarães; Diamantino Freitas; António P.O. Carvalho; Nuno R. GrandeWorkers chronically exposed to high-intensity/low-frequency noise at textile plants show increased frequency of respiratory infections. This phenomenon prompted the herein investigation on the cytology of the bronchial epithelium of Wistar rats submitted to textile noise. Workplace noise from a cotton-mill room of a textile factory was recorded and reproduced in a sound-insulated animal room. The Wistar rats we...
Reduction of Rat Pleural Microvilli Caused by Noise Pollution
Maria João R. Oliveira; António S. Pereira; Paula G. Ferreira; Nuno R. Grande; Artur P. Águas; Laura Guimarães; Diamantino Freitas; A CarvalhoScanning electron microscopy (SEM) was used to investigate whether chronic exposure to noise modifies pleural morphology. Rats were submitted to 8-h/day schedule of noise that is similar to the working hours at cotton-mill rooms. Morphometry of the area occupied by microvilli on the pleural surface showed a decrease in microvilli after 3 months of rat exposure to noise. The reduction of microvilli was 10% after...
Electrochemical and electrocatalytic studies of toluidine blue immobilized on a...
Santos,Antonio S.; Pereira,Arnaldo C.; Kubota,Lauro T.The electrochemical behavior of toluidine blue (TB) adsorbed on a silica surface modified with niobium oxide (SN) was investigated using a modified carbon paste electrode. The presence of SN gave the electrode high stability, avoiding the leaching out of the mediator from the electrode surface. The formal potential (E0') of the adsorbed TB was --113 mV vs. SCE, indicating a shift of almost 100 mV towards more p...
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