  Noncommutative pfaffians associated with an orthogonal algebra are some
special elements of the universal enveloping algebra. In the paper it is
suggested to use some pfaffians as raising operators. The images of these
pfaffians in the Mickelson-Zhelobenko algebra are calculated. It allows to find
a place of pfaffians among other raising operators. As a byproduct the action
of the pfaffians on the Gelfand-Tsetlin-Molev bases is found. The action of
pfaffians in the tensor realization of representation is considered in the
appendix.
