RESUMEN
The interaction of Co hexagonal magnetic nanoparticles (MNPs) with distearoyl phosphatidyl glycerol (DSPG) and distearoyl phosphatidic acid (DSPA) films adsorbed at a water/1,2-dichloroethane interface is studied employing cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), capacity curves and interfacial pressure-area isotherms. DSPA and DSPG adsorb at the interface forming homogenous films and producing a blocking effect on the transfer process of tetraethyl ammonium (TEA(+)), used as a probe cation. In the presence of Co NPs this effect is reversed and the reversible transfer process for TEA(+) is reestablished, to a greater or lesser extent depending on the structuration of the film. Co-DSPA hybrid films have a homogeneous structure while Co-DSPG films present different domains. Moreover, the presence of Co on DSPA film modifies the partition coefficient of the organic electrolyte into the hydrocarbon layer.
Asunto(s)
Nanopartículas de Magnetita/química , Fosfolípidos/química , Adsorción , Dicloruros de Etileno/química , Ácidos Fosfatidicos/química , Fosfatidilgliceroles/química , Propiedades de Superficie , Agua/químicaRESUMEN
The critical neurosurgical patient requires specialized nursing care. His satisfactory recovery depend an our nurses's work, since their permanence beside the patient and an appropriate treatment make them indispensable. A descriptive and retrospective study of 68 neurosurgical patients admitted at the Intermediate Therapy Unit of the "Gustavo Alderguia" Clinical ans Surgical Teaching Hospital was conducted to determine within the Nursing Care Process (NCP) the main specific nursing procedures and those variables of interest, such as sex, age, type of operation, NCP, mechanical ventilation, medication, evolution, and the nursing procedures carried out. A computerized system was used to analyze the data and the chi-square test of statistical significance. Of the 68 patients studied, 33 were males (p < 0.001). Patients aged 26-30 were the most affected. 13 patients were operated on, and NCP was performed in 20% of the cases. The most important nursing care activities were the vital signs checking, the measurement of diuresis, and the active surveillance of neurological focalization and phlebitis (p < 0.001).