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We show that existing low energy experiments, searching for the breaking oflocal Lorentz invariance, set bounds upon string theory inspired quantumgravity models that induce corrections to the propagation of fields. In theD-particle recoil model we find M > 1.2 x 10^5 M_P and v < 2 x 10^{-27}c forthe mass and recoil speed of the D-particle, respectively. These bounds are\~10^8 times stronger than the latest astrophysical bounds. These resultsindicate that the stringy scenario for modified dispersion relations is asvulnerable to these types of tests as the loop quantum gravity schemes.Comment: 12 pages, RevTeX. Revised versio

Bounds on stringy quantum gravity from low energy existing data