51.   But American and European scientists questioned why the study was conducted by the Harvard center, which has been criticized for receiving research money from industries under study.

52.   But Cordesman, who has conducted studies on military forces throughout the Mideast, and others see little hope of the violence coming to an end any time soon.

53.   But Aristech, which conducted some studies of the new material that showed problems in rats, said these were not relevant.

54.   But folic acid is cheap, so drug companies have little incentive to conduct a study.

55.   But John P. Morgan, a professor of pharmacology at City University of New York, who has conducted studies of PPA for the industry, disagreed.

56.   But no meteorological studies have been conducted to see if the structure is the cause.

57.   But now, several researchers are conducting studies that randomly assign women to have radiation or to forgo it.

58.   But she said that the study was being conducted in the same way that the Centers for Disease Control always carried out such studies.

59.   But some members of the task force that conducted the study, which was released Tuesday, disagreed over the significance of the findings.

60.   But the American Academy of Ophthalmologists wants Pfizer to conduct more studies into how Viagra affects vision.