Testing the applicability of artificial intelligence techniques to the subject of erythemal ultraviolet solar radiation part one: the applicability of a fuzzy rule based approach

This work presents the applicability of applying a fuzzy logic approach to the calculation of noontime erythemal UV irradiance for the plain areas of Egypt. When different combinations of data sets were examined from the test performance point of view, it was found that 91% of the whole series was estimated within a deviation of less than +/-10 mW/m(2), and 9% of these deviations lay within the range of +/-15 mW/m(2) to +/-25 mW/m(2).

Studies on the enzymatic degradation of oxytocin and vasopressin by human pregnancy sera

The enzymatic cleavage of synthetic oxytocin and 8-lysine vasopressin by sera of women in advanced pregnancy was investigated by using paper chromatography. Following incubation of either hormone with pregnancy serum and subsequent oxidation, two molecular fractions were formed, of which one could be identified as L-cysteic acid. By contrast, oxidation of the intact cyclopeptide hormones did not lead to liberation of free L-cysteic acid. It was concluded that oxytocin and 8-lysine vasopressin were cleaved by an identical mechanism involving splitting of the peptide bond joining the tyrosine residue (position 2) to the amino-terminal halfcystine residue (position 1). Pregnancy serum »oxytocinase« and »vasopressinase« thus appeared to be one and the same enzyme.