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We have developed a grid of chemical evolution models applied to dwarfisolated galaxies, using \cite{gav05} yields. The input data enclose differentstar formation efficiencies, galaxy mass and collapse time values. The resultis a wide collection of solutions that vary from objects with low metallicityand great amount of gas, to those with little gas and high metallicity. Noenvironmental effects like tidal or galactic winds have been treated, so theseobjects are expected to be close to field dwarf galaxies, more than clusterones. We have studied the time evolution of the abundance of oxygen andnitrogen and the amount of gas, related to their star formation history, aswell as the possibility of gas losses by SN winds.

Models of evolution of gas and abundances in dwarf irregular galaxies