RESUMEN
Two infrared spectroscopic methods, optothermal near infrared (NIR) spectroscopy and Fourier transform mid-infrared-attenuated total reflection (FTIR-ATR) spectroscopy, were applied to 24 cheese samples in order to obtain protein, fat and moisture contents. Reference values of the protein, fat and moisture contents in weight percent were obtained using standard wet chemistry analysis. Prediction correlation coefficients between 0.93 and 0.96 and standard errors of prediction between 2% and 5% were obtained using optothermal spectroscopy while the corresponding values for FTIR-ATR were 0.81-0.92 and 4-9%. Inhomogeneities in the cheeses, primarily due to the fat droplets, are probably the main reason for the differences in the error sizes. The superior results for optothermal spectroscopy are the more attractive because the instrument is easier to use than the FTIR-ATR instrument, it provides results more quickly with simpler statistical analysis and it is more compact and robust.
RESUMEN
A prototype instrument based on optothermal spectroscopy has been developed for determining the haemoglobin content of blood. The optothermal detector is described and consists essentially of a thin sapphire disc glued to a piezoelectric ring. The optothermal instrument is also described. The results of clinical tests using 616 blood samples show excellent agreement with the standard cyanmethemoglobin method and a reproducibility of better than +/- 2%.
Asunto(s)
Hemoglobinometría/métodos , Análisis Espectral/métodos , Hemoglobinometría/instrumentación , Humanos , Técnicas de Dilución del Indicador , Análisis Espectral/instrumentaciónAsunto(s)
Oído Interno/fisiología , Modelos Biológicos , Membrana Basilar/fisiología , Permeabilidad de la Membrana Celular , Conductividad Eléctrica , Células Ciliadas Auditivas/fisiología , Audición , Humanos , Canales Iónicos , Mecanorreceptores/fisiología , Potenciales de la Membrana , Neuronas/fisiologíaRESUMEN
This follow-up study on hemiarthroplasty of the hip evaluates the effectiveness of the treatment in various hip conditions. A total of 169 hemiarthroplasties of the hip were performed at the Medical College of Georgia from 1966 to 1972. Fifty-two patients were available for follow-up study in 1975. Hips were evaluated by Harris' hip evaluation method. The patients were divided into various diagnostic groups. The hips with idiopathic avascular necrosis followed by the hips with fresh fractures showed the best overall results. The results were not as good when the acetabulum was damaged, but acetabuloplasty was beneficial in these patients. In view of the complications of the total hip reconstruction and greater functional demand, a more conservative approach in younger patients is discussed. The hips with rheumatoid and degenerative joint disease did poorly with hemiarthroplasty.
