On duality of the noncommutative extension of the Maxwell-Chern-Simons model

We study issues of duality in 3D field theory models over a canonical noncommutative spacetime and obtain the noncommutative extension of the Self-Dual model induced by the Seiberg-Witten map. We apply the dual projection technique to uncover some properties of the noncommutative Maxwell-Chern-Simons theory up to first-order in the noncommutative parameter. A duality between this theory and a model similar to the ordinary self-dual model is estabilished. The correspondence of the basic fields is obtained and the equivalence of algebras and equations of motion are directly verified. We also comment on previous results in this subject.Comment: Revtex, 9 pages, accepted for publication PL

Infeção fetal não primária por citomegalovírus

Cytomegalovirus (CMV) is the most common congenital viral infection, causing hearing, visual and psychomotor impairment. Preexisting maternal CMV immunity substantially reduces, but not eliminates, the risk of fetal infection and affectation. This article is about a case of nonprimary maternal CMV infection during pregnancy, with vertical transmission, resulting in severe fetal affectation. Preconceptional analysis indicated maternal CMV past infection. Pregnancy progressed uneventfully until the 20th week ultrasound (US), which revealed cerebral abnormalities: thin and hyperechogenic cerebral cortex with prominent lateral ventricles, bilateral periventricular hyperechogenicities, cerebellar vermis hypoplasia and absent corpus callosum. The MRI suggested these findings were compatible with congenital infection rather than primary brain malformation.The fetal karyotype was normal. The title of CMV's IgG antibodies almost tripled. Since the first semester, analysis of the polymerase chain reaction (PCR) for CMV DNA in the amniotic fluid was negative. The pregnancy was terminated at 23 weeks. Neuropathological findings at autopsy showed severe brain lesions associated with CMV infection.O citomegalovírus (CMV) é a infeção viral congénita que mais comumente causa deficiência auditiva, visual e psicomotora. A preexistência de imunidade materna reduz substancialmente, mas não elimina, o risco de infeção e afetação fetal. Trata-se de um caso de infeção materna não primária por CMV durante a gravidez, com transmissão vertical, resultando em afetação fetal severa. As análises preconcepção indicavam infecção passada por CMV. A gravidez decorreu sem intercorrências até a ecografia efetuada na 20ª semana, que revelou alterações cerebrais: córtex cerebral fino e hiperecogénico com ventrículos laterais proeminentes, hiperecogenecidades periventriculares bilaterais, hipoplasia do vérmis cerebeloso e ausência de corpo caloso. A ressonância magnética sugeriu que estes achados eram mais favoráveis a uma infeção congénita do que com uma malformação cerebral primária. O cariótipo fetal era normal. O título de anticorpos IgG para CMV havia triplicado desde a dosagem do primeiro trimestre. O PCR para o DNA do CMV no líquido amniótico foi negativo. A gravidez foi interrompida na 23ª semana. Os achados neuropatológicos na autópsia mostraram lesões cerebrais severas associadas a infeção por CMV.info:eu-repo/semantics/publishedVersio

Is Small Perfect? Size Limit to Defect Formation in Pyramidal Pt Nanocontacts

We report high resolution transmission electron microscopy and ab initio calculation results for the defect formation in Pt nanocontacts (NCs). Our results show that there is a size limit to the existence of twins (extended structural defects). Defects are always present but blocked away from the tip axes. The twins may act as scattering plane, influencing contact electron transmission for Pt NC at room temperature and Ag/Au NC at low temperature.Comment: 4 pages, 3 figure