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PubMed1990

Detection of RNA on northern blots by negative staining with aurintricarboxylic acid.

Aurintricarboxylic acid (ATA) is a well-known inhibitor of RNA and DNA modifying enzymes and was suggested as a potent RNase inhibitor for preparation of RNA (Hallick et al., 1977, Nucleic Acids Res. 4, 3055-3064). We show that ATA is a very useful stain for detecting RNA on Northern blots and slot blots although it did not fully protect purified RNA in concentrated solution against RNase A.

Animals↗
PubMed1979

Evaluation of negative staining technique for determination of CN--insensitive superoxide dismutase activity.

The different forms of superoxide dismutase (superoxide-superoxide oxidoreductase, EC 1.15.11) have been studied, in tissues of rat, mouse and chicken, by the ectrophoresis-nitro blue tetrazolium technique proposed by Beauchamp. Similar enzyme patterns were evident in every tissue. A fast migrating CN--sensitive form of dismutase activity was present in isolated liver mitochondria of each species. Chicken and mouse liver mitochondria, as well as whole homogenate of every tissue of these two species, showed two additional slow-migrating bands of CN--insensitive activity. In contrast, such bands were not detectable in mitochondria isolated from rat liver or in any of the rat tissues analyzed by this technique. Prior to their electrophoretic separation, the samples were analyzed for CN--insensitive superoxide dismutase activity by a spectrophotometric assay; by this assay it was possible to demonstrate and quantitate a CN--insensitive superoxide dismutase activity in every preparation. Two units of CN--insensitive activity were applied to the gels for each sample. These results indicate that the electrophoresis-nitro blue tetrazolium technique is unsuitable for the detection of the rat CN--insensitive form of superoxide dismutase in crude preparations such as whole tissue homogenates or isolated mitochondria.

Animals↗