The state Board of Examiners for Nursing disciplined six nurses this week, including several cases of nurses who abused drugs or alcohol. On Wednesday, the board revoked the license of Michelle Murphy, a registered nurse from Longmeadow, Massachusetts, for violating an earlier probation by not submitting drug test results to the state Department of Public Health, records show. In April, the board had placed her on probation for two years based on findings that she took the painkillers fentanyl and Dilaudid for her own use and abused controlled substances to excess, records show. The board also revoked the license of licensed practical nurse Adam Burr of New Britain, who was intoxicated while working for PSA Healthcare of Plainville doing care in a patient’s home, state records show. The board found that Burr’s abuse of alcohol and an emotional disorder or mental illness he has suffered from since 2013 were affecting his ability to practice nursing.