Ui a. ' nor "95 per cent life" values of the erythocytes between the depleted and control subjects. At ' '95 per cent Cr5'-life, ' ' relative elution rate effects are minimized and at ' 'total-life, ' ' the elution rate has no theoretic effect.

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Oligomers/polymers formed during the thermal-oxidative ageing of esterbased aviation turbine oils have been investigated, using pentaerythritol tetraheptanoate as a model ester. The principal polymer structures in the primary ageing state were revealed by means of chromatographic and spectroscopic methods. The most probable structures are dicarboxylic acid polyesters with variable amounts of a; o-dicarboxylic acids having chain lengths of C, up to C, The C,-branches also contained ester-bonded hydroxy as well as 0x0 substituents. Pentaerythritol triheptanoate discarboxylic acid mono esters were active precursors in polymer formation.

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