/**
  * Detach the specified object from the <code>PersistenceManager</code>.
  *
  * @param pc the instance to detach
  * @return the detached instance
  * @see #detachCopyAll(Object[])
  * @since JDO 2.0
  */
 public synchronized Object detachCopy(Object pc) {
   checkStatus();
   return pm.detachCopy(pc);
 }