Results on the disconnected contributions for hadron structure

7 pages, 15 figures. Proceedings of the Lattice 2014 conference. v2 fixes captions of figures 1 and 2We present results on the disconnected contributions to three point functions entering in studies of hadron structure. We use $N_F = 2+1+1$ twisted mass fermions and give a detailed description on the results of the nucleon {\sigma}-terms, isoscalar axial charge and first moments of bare parton distributions for a range of pions masses. In addition we give the {\sigma}-terms and the computations are performed using QUDA code implemented on GPUs