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The infinite tension limit of string amplitudes is examined with some care,identifying the part responsible of diamagnetic behaviour as well as a peculiarparamagnetic {\em tachyon magnifying} responsible of asymptotic freedom. Theway string theory represents abelian gauge theories is connected with thenon-planar reggeon/pomeron amplitude and a nontrivial beta function is found inthe low energy limit of a single D-brane.Comment: LaTeX, 20 pages, 4 figures, two references adde

Ultraviolet and infrared freedom from string amplitudes