We apply the full one-loop corrections to the masses, gauge couplings, and
Yukawa couplings in the minimal supersymmetric standard model. We focus on
predictions for the strong coupling and the bottom-quark pole mass in the
context of SU(5) supersymmetric grand unification. We discuss our results in
both the small and large tanβ regimes. We demonstrate that the finite
(non-logarithmic) corrections to the weak mixing angle are essential in
determining αs and mb when some superpartner masses are light.
Minimal SU(5) predicts acceptable αs and mb only at small
tanβ with SUSY masses of O(TeV). The missing doublet model
accommodates gauge and Yukawa coupling unification for small or large
tanβ, and for any SUSY mass scale. In the large tanβ case, the
bottom mass is acceptable only if the Higgsino mass parameter μ is
positive.Comment: 10 pages, epsf, 7 figures included. Talk given at the PASCOS
Symposium/Johns Hopkins Workshop, Baltimore, MD, March 22-25, 199