A subcommittee of the U.S. House of Representatives has asked to see the results of yet another inquiry by Purdue University into a line of energy research known as bubble fusion. The inquiry, which is under way, is the second formal investigation into the research and the fourth over all conducted by the university.

Along with a letter to Purdue’s president seeking the conclusions of the latest inquiry, the House Subcommittee on Science and Technology released a report on the university’s former inquiries as well. The report says that Purdue was “not thorough” and that it ignored its own protocols as well as the testimony of senior faculty members.

The various investigations have centered on whether Rusi P. Taleyarkhan, a nuclear-engineering professor, influenced students who were attempting to confirm his results that appeared to show it was possible to create a new form of inexpensive fusion energy. In 2002 Mr. Taleyarkhan announced he had created fusion from collapsing bubbles in acetone. In the years since then, however, no experiments beyond Purdue have confirmed Mr. Taleyarkhan’s findings, raising allegations of fraud.

Once the Congressional panel reviews the latest inquiry, it may either conduct its own investigation or ask the Department of Defense to do so. The Pentagon is financing the work to confirm Mr. Taleyarkhan’s results. —Erik Vance