  Oxygen and zinc in the Galactic bulge are key elements for the understanding
of the bulge chemical evolution. Oxygen-to-iron abundance ratios provide a most
robust indicator of the star formation rate and chemical evolution of the
bulge. Zinc is enhanced in metal-poor stars, behaving as an $\alpha$-element,
and its production may require nucleosynthesis in hypernovae. Most of the
neutral gas at high redshift is in damped Lyman-alpha systems (DLAs), where Zn
is also observed to behave as an alpha-element. The aim of this work is the
derivation of the alpha-element oxygen, together with nitrogen, and the
iron-peak element zinc abundances in 417 bulge giants, from moderate resolution
(R~22,000) FLAMES-GIRAFFE spectra. For stars in common with a set of UVES
spectra with higher resolution (R~45,000), the data are intercompared. The
results are compared with literature data and chemodynamical models.
