  In this work we are interested to studying the Kondo effect present in a
system with a $T$-shape ligation between a single-wall carbon nanotube (SWNT)
and a magnetic impurity. The system has been studied under hydrostatic pressure
and it was observed the opening of the gap in the density of states of the
zigzag metallic tube. The pressure can be modeled by the Pierls instability and
in this work we consider the out-of-plane distortion. A tight-binding
approximation is used to calculate the SWNT Green's functions with hydrostatic
pressure applied. We studied the disappearance of the Kondo peak as the gap
opens. Moreover, we observed the strong influence of the pressure in the
conductance curve that can be explained by the variation of Kondo peak height.
The Kondo effect was reproduced with the atomic approach with
$U\rightarrow\infty$ developed previously. Results of the electronic density of
states and curves of the conductance are presented.
