Qué nivel de conceptualización legitima el docente en clases de química de primer año de polimodal. una mirada desde el discurso

El trabajo analiza la influencia del diálogo áulico, en la conceptualización del contenido Reacción Química, mediante investigación etnográfica con estudio interpretativo y de casos, en clases de primer año de nivel polimodal (16 a17 años) de dos docentes de esuelas Argentinas. Se analiza el contenido curricular expresado en niveles de conceptualización, lo cual se explicita en los mensajes que planifica y legitima el docente en las clases

Calibration and Measurement of Potassium-40 with a Whole-Body Counter

Total potassium content in the human body may be obtained by measuring naturally occurring radioactive potassium-40, in a whole-body counter. The basic problem in calibrating the whole-body counter is discussed, as well as a phantom that is used to solve this problem. The normal potassium levels for men and for women were determined. Two additional parameters - lean body mass and total body water - derived from the potassium content, were also calculated

Digitale Dataverwerking Gedurende Radio-isotoopflikkergrafie

The features of an on-line image data processing system for nuclear medicine are described. The uses of the system for the processing and evaluation of images, lung function determinations and cardiac studies are mentioned

Fracturas proximales de fémur. Osteosíntesis con tornillo-placa deslizante versus clavo gamma

Presentamos un estudio retrospectivo de noventa fracturas del fémur proximal tratados con clavo GAMMA o tornillo-placa dinámico de cadera (DHS). No encontramos diferencias en la duración de la intervención, pérdida hemática, ni estancia hospitalaria. Sin embargo, la serie con clavo GAMMA inició el apoyo más temprano, aunque en la revisión al final del seguimiento no había diferencias significativas en cuanto a la función de la cadera. El fracaso de la síntesis ocurrió en cuatro casos con el DHS, pero las complicaciones intraoperatorias fueron más frecuentes con el clavo GAMMA, principalmente elevada incidencia de fracturas de la diáfisis femoral, asociado en parte al diseño del implante. Recomendamos el empleo del clavo GAMMA sólo para las fracturas inestables del fémur proximal.We report a prospective study of ninety fractures of proximal femur treated by either the GAMMA nail or the dynamic hip screw (DHS). We found no difference in operating time, blood loss or stay in the hospital. However, the GAMMA nail group had a earlier full weight-bearing, but there was no significant difference in hip function at final review. There was failure of proximal fixation in four cases with the DHS. More intra-operative complications were recorded in the GAMMA nail group, mainly a high incidence of femoral shaft fracture which we relate in part to the design of the implant. We only recommend the use of the GAMMA nail for unstable intertrochanteric fractures of the proximal femur

Kwantitatiewe Radio-isotoop Kardiografie met die Sintillasie-kamera

Methods for obtainiR9 various cardiac parameters, using radio-isotopes and the scintillation camera, have improved tremendously during recent· years. These investigations offer a simplified screening test for visual interpretation. By the use of numerical techniques, quantitative information can be obtained, making investigations more sensitive. Left-to-right shunts, cardiac output, left ventricular ejection fraction and other parameters can be quantitated

Acquisition and Processing of Cerebral Blood Flow Data with a M;ultichannel Analyser and Microcomputer

The method of the determination of cerebral blood flow in dogs with radio-isotopes to evaluate ethrane as a new anaesthetic agent is described, as well as the use of a multichannel analyser and the programmes developed for the analysis of data in a conversational mode. Preliminary results of the use of the computer programme are presented