In this paper, we are going to put in a single consistent framework
apparently unrelated pieces of information, i.e. zero-point length,
extra-dimensions, string T-duality. More in details we are going to introduce a
modified Kaluza-Klein theory interpolating between (high-energy) string theory
and (low-energy) quantum field theory. In our model zero-point length is a four
dimensional ``virtual memory'' of compact extra-dimensions length scale. Such a
scale turns out to be determined by T-duality inherited from the underlying
fundamental string theory. From a low energy perspective short distance
infinities are cut off by a minimal length which is proportional to the square
root of the string slope, i.e. \sqrt{\alpha^\prime}. Thus, we provide a
``bridge'' between the ultra-relativistic string domain and the low energy
arena of point-particle quantum field theory.Comment: 28 pages, Latex, no figures; two references adde
