Registered nurses at University of California medical centers today blasted university administration for attacking the right of nurses to strike to correct on-going staffing problems at UC by obtaining a court restraining order barring a walkout planned for Thursday, and said they will continue to take whatever steps necessary to resolve the serious staffing problems at the hospitals. The nurses, who are represented by the California Nurses Association, will hold rallies at UC medical centers Thursday to press their on-going case for safe staffing.