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Protecting eyes.

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Anesthesia↗

Plasma concentrations of cortisol in cows with hypocalcaemia in relation to their responses to treatment with calcium.

The mean plasma concentration of cortisol at the time of the first treatment for hypocalcaemia at calving was significantly higher in 17 cows which did not recover, than in 53 cows which recovered. Healthy periparturient cows had significantly lower cortisol levels than cows with hypocalcaemia. There was a negative correlation between plasma cortisol and plasma calcium at the time of the first treatment. After adjustment for differences in plasma calcium there was no significant difference between cortisol concentrations in healthy cows and paretic cows which recovered. Plasma cortisol was positively correlated with both packed cell volume (PCV) and serum creatine kinase (CK). At first treatment cows which did not recover had higher levels of PCV and serum CK than cows which recovered, and the difference between the mean plasma cortisol concentrations of these two groups was related to differences in plasma calcium, PCV and serum CK. Plasma cortisol concentrations remained high in cases of protracted paresis.

Animals↗

Stability of DNA/anti-DNA complexes. II. Salt lability and avidity.

The kinetics of dissociation of antibody-radiolabeled dsDNA (homogeneous PM2 DNA or sonicated dsDNA of m.w. 6 x 10(5)) complexes at 37 degrees C have been examined via three independent radioimmunoassays: the Farr, Millipore Filter, and PEG assays. Two different procedures were used to study the kinetics. Either excess unlabeled DNA or high salt concentrations were employed to induce complex dissociation. Our results suggest that typical SLE sera contain at least two distinct populations of anti-dsDNA antibodies. One population is of rather high avidity and dissociates slowly in the presence of excess DNA or high salt. The other population is of considerably lower avidity and is dissociated more rapidly under these conditions. The results of a double label dissociation kinetics study provide independent evidence supporting this hypothesis.

Animals↗