Interaction of UO2 2+ with sodium dodecyl sulfate micelles: association of phenols to micelles through fluorescence quenching data.

Time-resolved laser-induced fluorescence (TRLIF) has been used to study the interaction of uranyl ion with sodium dodecyl sulfate (SDS) micelles in H(3)PO(4) 1 M. The titration curve consists of two curved regions with different slopes, one of them more pronounced at low concentration of SDS and the other, with a less pronounced positive slope at larger [SDS] until a plateau is reached. The fluorescence quenching of uranyl ion by para-substituted phenol compounds was studied by TRLIF and steady-state emission intensity measurements.

Serum angiotensin converting enzyme in diabetic retinopathy.

Serum levels of angiotensin converting enzyme (SACE) were measured in 118 diabetic patients divided into the following four groups: 44 insulin-treated diabetic patients with severe retinopathy, 38 non insulin-treated diabetic patients with severe retinopathy, 18 diabetic patients, including both insulin-treated and non insulin-treated subjects with background retinopathy, 18 diabetic patients, insulin-treated and non insulin-treated without signs of retinopathy. Nineteen retinopathic patients non diabetic were also studied in order to verify whether SACE levels are altered when retinopathy is present independently from diabetes. The control group was composed of 44 normal subjects.