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Íleo Meconial Complicado. Caso Clínico de Diagnóstico Antenatal
Loureiro, M.; Costa, Estêvão; Mariz, C.; Montenegro, N.; Silva, Costa e; Souto, A.; Centeno, M. J.Descreve-se um caso clínico de íleo meconial com diagnóstico antenatal por ultrassonografia às 32 semanas de gestação. Após cesariana electiva às 37 semanas, o recém-nascido foi submetido a intervenção cirúrgica no primeiro dia de vida por quadro de oclusão intestinal secundário a íleo meconial complicado. Os testes laboratoriais confirmaram a presença de fibrose quística.Faz-se uma breve revisão da etiopatogen...
Binding energy and photoionization cross-section in GaAs quantum well-wires and...
Correa,J. D.; Porras-Montenegro,N.; Duque,C. A.Using a variational procedure for a hydrogenic donor-impurity we have investigated the influence of an axial magnetic field and hydrostatic pressure in the binding energy and the impurity-related photoionization cross-section in 1D and 0D GaAs low dimensional systems. Our results are given as a function of the radius, the impurity position, the polarization of the photon, the applied magnetic field, the normali...
Hydrostatic pressure and electric-field effects on the shallow donor impurity s...
González,J. W.; Porras-Montenegro,N.; Duque,C. A.Using a variational procedure within the effective-mass approximation, we have made a theoretical study of the effects of hydrostatic pressure and applied electric fields on the binding energy of a shallow-donor impurity in square-transversal section GaAs-Ga0.7Al0.3As quantum-well wires. The electric field is applied in a plane of the transversal section of the wire and many angular directions are considered. T...
The role of the boundary conditions on the critical properties of superconducti...
Calero,J. M.; Porras-Montenegro,N.; Granada,J. C.In the framework of the Ginzburg-Landau (GL) theory in the limit of a GL parameter much larger than unity, we study theoretically the critical behavior of a mesoscopic superconducting ring with negligible width in the presence of a magnetic field applied perpendicularly to the ring plane. It is assumed that the inner ring edge is in contact with a material whose properties are accounted in the de Gennes boundar...
Electron g-factor and cyclotron effective mass in semiconductor quantum wells u...
Dios-Leyva,M. de; Porras-Montenegro,N.; Brandi,H. S.; Oliveira,L. E.The Ogg-McCombe effective Hamiltonian for the electron in the conduction band together with the non-parabolic and effective-mass approximations were used in a theoretical study of the cyclotron effective mass and electron effective Landé g ; ; -factor in semiconductor GaAs-Ga1-xAl xAs quantum wells under an applied magnetic field parallel to the growth direction of the quantum well. Calculations are performe...
Pattern of intrauterine growth and Doppler flowmetry.
Cardoso, F; Departamentos de Ginecologia e Obstetrícia, Hospital de Sào João, Porto.; Paiva, V; Calejo, L; Montenegro, N; Leite, L P; Centeno, M JThe aim of this study was to evaluate the accuracy of ultrasound biometric and hemodynamic fetal parameters for the prenatal diagnosis of intrauterine retardation in a sample of 438 pregnant women who had their first visit before the 16th week of gestation at the outpatient clinic of the Department of Obstetrics and Gynecology, S. Joào Hospital. The results are presented for 427 mother-infant pairs correspondin...
Transvaginal endosonography and Doppler study in embryo-fetal hemodynamic asses...
Montenegro, N; Departamento de Obstetrícia e Ginecologia, Hospital de S. João, Faculdade de Medicina do Porto.; Areias, J C; Leite, L PTransvaginal endosonography is now currently used in obstetrics and gynecology practice and seems a promising tool for essential studies on first trimester pregnancy. High-resolution and duplex/color Doppler in vaginal probes have brought to light new chances for early investigations on embryonic-fetal haemodynamics. We report our experience in this field, together with a review of the literature, giving an ove...
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