But some academics say many of these journals’ methods are little different from spam e-mails offering business deals that are too good to be true.

Paulino Martínez, a doctor in Celaya, Mexico, said he was gullible enough to send two articles in response to an e-mail invitation he received last year from The Journal of Clinical Case Reports. They were accepted. Then came a bill saying he owed $2,900. He was shocked, having had no idea there was a fee for publishing. He asked to withdraw the papers, but they were published anyway.

“I am a doctor in a hospital in the province of Mexico, and I don’t have the amount they requested,” Dr. Martínez said. The journal offered to reduce his bill to $2,600. Finally, after a year and many e-mails and a phone call, the journal forgave the money it claimed he owed.

Some professors listed on the Web sites of journals on Beall’s list, and the associated conferences, say they made a big mistake getting involved with the journals and cannot seem to escape them.

Thomas Price, an associate professor of reproductive endocrinology and fertility at the Duke University School of Medicine, agreed to be on the editorial board of The Journal of Gynecology & Obstetrics because he saw the name of a well-respected academic expert on its Web site and wanted to support open-access journals. He was surprised, though, when the journal repeatedly asked him to recruit authors and submit his own papers. Mainstream journals do not do this because researchers ordinarily want to publish their papers in the best journal that will accept them. Dr. Price, appalled by the request, refused and asked repeatedly over three years to be removed from the journal’s editorial board. But his name was still there.

“They just don’t pay any attention,” Dr. Price said.

About two years ago, James White, a plant pathologist at Rutgers, accepted an invitation to serve on the editorial board of a new journal, Plant Pathology & Microbiology, not realizing the nature of the journal. Meanwhile, his name, photograph and résumé were on the journal’s Web site. Then he learned that he was listed as an organizer and speaker on a Web site advertising Entomology-2013.

“I am not even an entomologist,” he said.

He thinks the publisher of the plant journal, which also sponsored the entomology conference, — just pasted his name, photograph and résumé onto the conference Web site. At this point, he said, outraged that the conference and journal were “using a person’s credentials to rip off other unaware scientists,” Dr. White asked that his name be removed from the journal and the conference.