PubMed · 37019
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K M Rost, R W Jaeger, F J deCastro. 1979. Eye contamination: a poison center protocol for management.. https://doi.org/10.3109/15563657908992448
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Structural modification of DNA were induced by X-irradiation of crude hepatic nuclei at various dose ranges to standardize DNA damage evaluated by the alkaline elution technique. This quantitative assay can be used as reference for DNA damage induced by the in vivo administration of mutagens and/or carcinogens involved in the environment.
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Gel filtration on Sephadex G-100 at pH 9.0 in 1 mM Tris buffer produces denaturation and inactivation of pancreatic DNAase A. Limiting concentrations of Ca2+ in the suspension and elution buffer, reactivates some of the enzyme molecules in an amount proportional to the calcium added. Stable active and inactive forms were separated on Sephadex columns. A model for the conformational role of Ca2+ on DNAase A demonstrates that at least one Ca2+ is involved (Kapp = 8.3 . 10(-5) M) in the correct folding of the polypeptide chain. Na+ was unable to reactivate the enzyme.