2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/54795We report on recent progress in the use of string techniques for the computation of field theory amplitudes. We show how one-loop renormalization constants in Yang-Mills theory can be computed using the open spinning string, we review the calculation of two-loop scalar amplitudes with the bosonic string, and we briefly indicate how the technique can be applied to the two-loop vacuum bubbles of Yang-Mills theory.9 pages, Latex, contribution to the proceedings of the workshop Gauge Theories, Applied Supersymmetry and Quantum gravity, Imperial College, London, 1996High Energy Physics - TheoryHigh Energy Physics - Phenomenologytext