Falsified scientific papers, published by the journals Science in 2005 and Nature Chemical Biology in 2006, are being retracted by their lead author.

Officials at the Korea Advanced Institute of Science and Technology said that Tae Kook Kim, a biotechnology professor at a leading technical university in South Korea, had acknowledged that he forged data on an anti-aging technology for the papers, according to a report by the Associated Press.

The institute, known as Kaist, has suspended Mr. Kim from teaching and conducting research, said Yeon Soo Seo, a member of the institute’s investigation team. Officials said that the institute was considering whether to take other disciplinary measures.

In the two papers, Mr. Kim claimed to have identified substances that could slow aging in cells, but the investigation found that data in the 2005 paper had been fabricated and the substance noted in the 2006 paper had already been discovered by a researcher at Harvard University.

The admissions are another blow to science in South Korea, which was hit hard by the revelations in 2005 that Woo Suk Hwang, the country’s most famous scientist, had faked evidence in papers claiming breakthroughs in stem-cell research. —Josh Fischman