public void delete(String i){
		 
	    Query query = new Query("UE_turno");
	    query.addFilter("id_UE_turno", FilterOperator.EQUAL, i);
	    PreparedQuery pq = datastore.prepare(query);
	    Entity UE_turno = pq.asSingleEntity();
	    datastore.delete(UE_turno.getKey());
	}