  Certain membrane proteins, peptides, nanoparticles and nanotubes have rigid
structure and fixed shape. They are often viewed as spheres and cylinders with
certain surface properties. Single Chain Mean Field theory is used to model the
equilibrium insertion of nanoscale spheres and rods into the phospholipid
bilayer. The equilibrium structures and the resulting free energies of the
nano-objects in the bilayer allow to distinguish different orientations in the
bilayer and estimate the energy barrier of insertion.
