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Agarose gel electrophoresis of sedimentary nucleic acids by extraction using the fluorometric method. Lanes: 1, lambda plasmid digested with HindIII (molecular weight marker); 4 and 5, calf thymus DNA standard (0.4 and 0.8 μg, respectively); 7, sediment sample from 1,540-m depth; 8, sediment sample from 100-m depth containing internal standard of calf thymus DNA, treated with RNase; 9, sediment sample from 100-m depth treated with RNase.
