In Business This Week
-- The FDA approved a new sweetener, and PepsiCo will use it in diet soda.
-- Advanced Fibre Communications lost some $1.6 billion in value after its CEO quit and it issued a profits warning.
-- Sun Microsystems is acquiring Java software highflier NetDynamics.
-- Midwest merger mania: Star Banc is buying Firstar for $7.2 billion.EDITED BY KELLEY HOLLAND