Using "Explode" We can also "Explode" the Subject Heading. If we don’t Explode this Gram-Negative Aerobic Bacteria item, all we get are two citations. By Exploding, we see these and all terms with citations related to Gram-Negative Aerobic Bacteria. This way, the researcher doesn’t need to manually search for related items, the system does this work instead. Because it’s impossible for a title to be cataloged according to all possible related terms, the system lets the researcher optionally exploit the implicit relationships among terms.