The invention concerns a method and a device for inspecting pipelines, in particular for detecting defects in pipelines by means of ultrasound. In the nucleic acids of the present invention, a nucleotide having a substituted or unsubstituted 2-formyl-1H-pyrrol-1-yl group as a base forms a base pair with a nucleotide having a 6-substituted 9H-purin-9-yl group as a base. Discrete sets of resources may include locally accessible resources, enterprise accessible resources, capacity on demand resources, and grid resources.