28 research outputs found
Atomic structure at 2.5 Ã… resolution of uridine phosphorylase from E. coli as refined in the monoclinic crystal lattice
AbstractUridine phosphorylase from E. coli (Upase) has been crystallized using vapor diffusion technique in a new monoclinic crystal form. The structure was determined by the molecular replacement method at 2.5 Ã… resolution. The coordinates of the trigonal crystal form were used as a starting model and the refinement by the program XPLOR led to the R-factor of 18.6%. The amino acid fold of the protein was found to be the same as that in the trigonal crystals. The positions of flexible regions were refined. The conclusion about the involvement in the active site is in good agreement with the results of the biochemical experiments
Tau Polarization Asymmetry in
Rare decays provide an opportunity to probe for new physics beyond the
Standard Model. In this paper, we propose to measure the tau polarization in
the inclusive decay and discuss how it can be used, in
conjunction with other observables, to completely determine the parameters of
the flavor-changing low-energy effective Hamiltonian. Both the Standard Model
and several new physics scenarios are examined. This process has a large enough
branching fraction, , such that sufficient
statistics will be provided by the B-Factories currently under construction.Comment: 11 pages, LaTex file with psfig. Figures included via uufiles.
Lengthened version. Includes new calculation of Monte Carlo fit to Wilson
coefficient