chemical doping and electronhole conduction asymmetry in graphene devices we investigate polyethylene imine and diazonium salts as stable complementary dopants on graphene transport in graphene devices doped with these molecules exhibits asymmetry in electron and hole conductance the conductance of one carrier is preserved while the conductance of the other carrier decreases simulations based on nonequilibrium greens function formalism suggest that the origin of this asymmetry is imbalanced carrier injection from the graphene electrodes caused by misalignment of the electrode and channel neutrality points capricornella bicornuta a new genus and species of mite from eastern australia acari uropodina we describe a new genus and species of mite from eastern australia capricornella bicornuta the new genus is characterised by the presence of two long appendages on the anterior margin of the epigynal shield of the female