Universidade Federal de Minas Gerais

About: Universidade Federal de Minas Gerais is a education organization based out in Belo Horizonte, Minas Gerais, Brazil. It is known for research contribution in the topics: Population & Immune system. The organization has 41631 authors who have published 75688 publications receiving 1249905 citations.

Brucella spp noncanonical LPS: structure, biosynthesis, and interaction with host immune system.

Abstract: Brucella spp. are facultative intracellular pathogens that have the ability to survive and multiply in professional and non-professional phagocytes, and cause abortion in domestic animals and undulant fever in humans. Several species are recognized within the genus Brucella and this classification is mainly based on the difference in pathogenicity and in host preference. Brucella strains may occur as either smooth or rough, expressing smooth LPS (S-LPS) or rough LPS (R-LPS) as major surface antigen. This bacterium possesses an unconventional non-endotoxic lipopolysaccharide that confers resistance to anti-microbial attacks and modulates the host immune response. The strains that are pathogenic for humans (B. abortus, B. suis, B. melitensis) carry a smooth LPS involved in the virulence of these bacteria. The LPS O-chain protects the bacteria from cellular cationic peptides, oxygen metabolites and complement-mediated lysis and it is a key molecule for Brucella survival and replication in the host. Here, we review i) Brucella LPS structure; ii) Brucella genome, iii) genes involved in LPS biosynthesis; iv) the interaction between LPS and innate immunity.

EDUCAÇÃO REMOTA EMERGENCIAL: elementos para políticas públicas na educação brasileira em tempos de Covid-19

Abstract: O Covid-19 espalhou-se rapidamente pelo mundo em 2020 e gerou a inedita situacao de 90% da populacao estudantil estar isolada em todo o mundo. Neste trabalho, procuramos evidenciar a excepcionalidade da situacao que levou inumeros paises a desenvolver acoes de educacao remota emergencial e as implicacoes nos diferentes niveis educacionais. Analisamos o contexto brasileiro, no qual evidencia-se uma incipiencia na apropriacao de tecnologias digitais na educacao publica. Identificamos as principais informacoes sobre acesso a internet no pais, no sentido de discutir possiveis politicas educacionais com vistas ao fomento d a manutencao do convivio escolar, ainda que em patamares digitais, de maneira a fortalecer a escola como eixo central da sociedade brasileira.

Group theory analysis of electrons and phonons in N-layer graphene systems

Abstract: In this work we study the symmetry properties of electrons and phonons in graphene systems as a function of the number of layers. We derive the selection rules for the electron-radiation interactions and for the electron-phonon interactions at all points in the Brillouin zone. By considering these selection rules, we address the double-resonance Raman-scattering process. The monolayer and bilayer graphenes in the presence of an applied electric field are also discussed.