  We discuss UV/IR mixing effects in non-supersymmetric non-commutative U(N)
gauge theories. We show that the singular (non-planar) terms in the 2- and
3-point functions, namely the poles and the logarithms, can be obtained from a
manifestly gauge invariant effective action. The action, which involves open
Wilson line operators, can be derived from closed strings exchange between two
stacks of D-branes. Our concrete example is type 0B string theory and the field
theory that lives on a collection of N electric D3-branes. We show that one of
the closed string modes that couple to the field theory operator which is
responsible for the infrared poles, is the type 0 tachyon.
