thanks guys for your responses
Spgtopper: I am referring to the same bill; specifically section 313. Its a bill that covers a lot of specific details, but seems to ignore current PhD candidates.
Logiclife: Wikipedia and others define "the physical sciences" to exclude life sciences. That is actaully the meaning of physical sciences, i.e. not biological sciences. It would seem stupid to exclude it, since so much of R&D is taking place in biotech etc.
And I believe if they wd have allowed the transfer of F1 to F4, they wd have mentioned it in teh bill. I think the above 2 facts have to be brought to the attention of lawmakers.