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A molecular orbital study on the conformational properties of dopamine [1,2-ben...
Fausto, Rui; Ribeiro, Maria João S.; Lima, João J. Pedroso deThe results of a series of ab initio (3-21G) and semiempirical (PM3) molecular orbital (MO) calculations on neutral, zwitterionic and cationic forms of dopamine [1,2-benzenediol-4(2-aminoethyl)] are reported. In particular, optimised geometries, relative stabilities, dipole moments and electron charge distributions for the relevant conformational states of the studied molecules are presented and the conformatio...
Evaluation of pulmonary systemic blood flow using ECG gated acquisition
Lima, João J. Pedroso de; Botelho, Maria Filomena R.; Rafael, José A. S.; Bernardo, João; Gonçalves, Lino M.; Pacheco, Maria de FátimaWe propose a functional parametric analysis method using ECG-gated 99mTc-labeled red blood cell (RBC) imaging for detection and characterization of periodic variations in local blood activity in the lungs during cardiac cycle. We validated in animal experiments that such count variations correlate with cyclical pulmonary blood flow and may be used for evaluation of systemic-to-pulmonary shunts. Clinical studies...
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