  In this paper we study the phenomenon of UV/IR mixing in noncommutative field
theories from the point of view of world-sheet open-closed duality in string
theory. New infrared divergences in noncommutative field theories arise as a
result of integrating over high momentum modes in the loops. These are believed
to come from integrating out additional bulk closed string modes. We analyse
this issue in detail for the bosonic theory and further for the supersymmetric
theory on the $C^2/Z_2$ orbifold. We elucidate on the exact role played by the
constant background $B$-field in this correspondence.
