  We adress the problem of interactions between the longitudinal velocity
increment and the energy dissipation rate in fully developed turbulence. The
coupling between these two quantities is experimentally investigated by the
theory of stochastic Markovian processes. The so-called Markov analysis allows
for a precise characterization of the joint statistical properties of velocity
increment and energy dissipation. In particular, it is possible to determine
the differential equation that governs the evolution along scales of the joint
probability density of these two quantities. The properties of this equation
provide interesting new insights into the coupling between energy dissipation
and velocity incrementas leading to small scale intermittency.
