  The pseudomode approach is discussed with an emphasis to
Gorini-Kossakowski-Sudarshan-Lindblad form of this approach. The connection of
the pseudomode approach with solutions of both the Friedrichs model and
Jaynes-Cummings model with dissipation at zero temperature is shown. The
obtained results are applied to non-Markovian phenomena description in the
Fenna-Matthews-Olson complexes, estimations based on experimental data are
done. A deformation approach to generalization of the pseudomode approach to
the finite-temperature case is discussed.
