Teratogenia em bezerro nascido de vaca primípara cruzada.

O objetivo deste estudo é relatar um caso de teratogenia em bezerro ocorrido na Embrapa Gado de Corte. Trata-se de um bezerro macho, nascido em 13 de setembro de 2009, de uma vaca primípara cruzada com touro Senepol, que apresentou como teratogenia bicefalia e cicatriz umbilical atópica na região lombo-torácica

Suppression of carrier spin polarization in diluted ferromagnetic semiconductors

We present a theoretical method for studying diluted magnetic semiconductors, extending the dynamical cluster approximation. The precursor effects of the localization and the direct exchange interaction between magnetic impurities can be considered in the method. We apply the method to the two-dimensional square lattice system with random localized spins. We show that the strong antiferromagnetic superexchange interaction between nearest-neighbor sites suppresses the polarization of the carrier spin

Ab initio study of magnetic and electronic properties of Fe-filled single-walled carbon nanotubes

We investigate the electronic and magnetic properties of a metallic (3,3) single-walled carbon nanotube (SWCNT) filled with a linear Fe nanowire, based on the ab initio spin-polarized density functional theory. We find that in the stable structure the Fe-filled (3, 3), (5, 0) SWCNTs exhibit semiconducting properties, and the Fe nanowires lose their magnetic moment, while the (4, 4), (5, 5), (6, 6), (6,0) SWCNTs having larger radius with linear Fe nanowires are metallic, and show magnetic moments