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SYNOPSISThe effect of hydrogen chloride on the thermal degradation of poly(viny1 chloride) was studied in dibutyl-sebacate solution. It was found that hydrogen chloride exerts no catalytic effect at these conditions.The assumption of hydrogen chloride readdition to the double bonds formed is forwarded as a factor lowering the average length of polyenes. The possible mechanism of stabilizing action of metal soaps is discussed on this basis.

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A linear correlation have been found between the amplitude of the free radical signal of the electron spin resonance (ESR) spectrum of paraffin embedded liver blocks and the number of bile casts in the histological sections made from these blocks. It has been suggested that the major part of the ESR free radical signal arises from bile pigment, but the contribution of "age pigment" cannot be excluded. On the basis of model experiments the majority of these radical centers was assigned to protein bound bilirubin. In the course of histological processing more than 80% of various free radical centers arising in air dried liver tissue is extracted.

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