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Study of the RPA pair-correlation function in GaAs-AlGaAs parabolic quantum wel...
Cunha,J. B. B. da; Cunha,J. F. R. da; Machado,P. C. M.; Osório,F. A. P.; Borges,A. N.The ground state intrasubband pair-correlation function for a quasi-one-dimensional electron gas confined in a GaAs-Al xGa1-xAs parabolic quantum well wire within the Random-Phase Approximation (RPA) is calculated. We have considered two wires with subband energies separation homega = 2:0 meV and homega = 2:5 meV. The dependence of the pair-correlation function on the electronic density was studied and the regi...
Zeeman effect in Cd1-xMn xTe parabolic and half-parabolic quantum wells
Cunha,J. F. R.; Osório,F. A. P.; Borges,A. N.; Souza,M. A. R.We have investigated the electronic structure of Cd1_xMn xTe parabolic quantum wells and half-parabolic quantum wells heterostructures in the envelope function approximation using the k · p method. We have considered an external magnetic field applied in two different configurations: in the plane of the layer and in the growth direction. The confined states have been calculated taking into account the effective...
The mechanism of gentisic acid-induced relaxation of the guinea pig isolated tr...
Cunha,J.F.; Campestrini,F.D.; Calixto,J.B.; Scremin,A.; Paulino,N.We examined some of the mechanisms by which the aspirin metabolite and the naturally occurring metabolite gentisic acid induced relaxation of the guinea pig trachea in vitro. In preparations with or without epithelium and contracted by histamine, gentisic acid caused concentration-dependent and reproducible relaxation, with mean EC50 values of 18 µM and Emax of 100% (N = 10) or 20 µM and Emax of 92% (N = 10), r...
Gastric adenocarcinoma and carcinoid.
Cunha, P; Serviço de Gastrenterologia, Hospital Santo António dos Capuchos, Lisboa.; Cunha, J F; Burnay, M O; Galhordas, A; Fernandes, R; Calinas, FThe authors present a case report of synchronous gastric carcinoid and adenocarcinoma. The diagnosis of gastric carcinoid and its association with gastric carcinoma is discussed. ; The authors present a case report of synchronous gastric carcinoid and adenocarcinoma. The diagnosis of gastric carcinoid and its association with gastric carcinoma is discussed.
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