Adsorption of phospholipids by chrysotile fibers : comparison of data from chemical analysis and photoelectron spectrometry (PSX method)]

The adsorption of dipalmitoyl phosphatidyl choline (DPPC) by chrysotile fibers was carried out by chemical and photoelectron spectroscopy analysis. The adsorption isotherms have shown that maximum adsorption was about 130 microgram of DPPC per milligram of chrysotile. The results are in good agreement with estimates of a bilayer adsorption.     

Sebaceous gland atrophy in the rat after a portacaval shunt

Summary In the rat, 2 weeks after a portacaval shunt, the epithelium thickness of the skin is decreased, and so are the size and the number of sebaceous glands. These results are compatible with the hyperoestrogenic state associated with a testicular atrophy, observed after portacaval shunt.     

Forecasting non-seasonal time series with missing observations

Most forecasting methods are based on equally spaced data. In the case of missing observations the methods have to be modified. We have considered three smoothing methods: namely, simple exponential smoothing; double exponential smoothing; and Holt's method. We present a new, unified approach to handle missing data within the smoothing methods. This approach is compared with previously suggested modifications. The comparison is done on 12 real, non-seasonal time series, and shows that the smoothing methods, properly modified, usually perform well if the time series have a moderate number of missing observations.