Influence of microparticle bombardment on Agrobacterium tumefaciens infection of soybean (Glycine max) embryos and cotiledonary nodes - Alves, A C; Quecini, V M; Geraldi, Isaías Olívio; Gander, E S; Almeida, E R P; Vieira, Maria Lúcia Carneiro (Encontro Brasileiro de Biotecnologia Vegetal, 1997)