The formation of the solar system

The solar system started to form about 4.56 Gyr ago and despite the long intervening time span, there still exist several clues about its formation. The three major sources for this information are meteorites, the present solar system structure and the planet-forming systems around young stars. In this introduction we give an overview of the current understanding of the solar system formation from all these different research fields. This includes the question of the lifetime of the solar protoplanetary disc, the different stages of planet formation, their duration, and their relative importance. We consider whether meteorite evidence and observations of protoplanetary discs point in the same direction. This will tell us whether our solar system had a typical formation history or an exceptional one. There are also many indications that the solar system formed as part of a star cluster. Here we examine the types of cluster the Sun could have formed in, especially whether its stellar density was at any stage high enough to influence the properties of today's solar system. The likelihood of identifying siblings of the Sun is discussed. Finally, the possible dynamical evolution of the solar system since its formation and its future are considered.Comment: 36 pages, 7 figures, invited review in Physica Script

Análise da expressão diferencial de fatores de elongação e transerição de tomateiros resistentes e suscetíveis infectados com Tomato chlorotic mottle virus.

O objetivo desse trabalho foi analisar a expressão de genes da família dos fatores de elongação e de transcrição do hospedeiro durante a infecção viral por tomato chlorotic mottle virus (ToCMoV) em isolinhas de tomateiros resistentes (LAM157) e suscetíveis (Santa Clara).Resumo 253-1

Monitoramento do ácido chiquímico em plantas de citrus sob diferentes sistemas de manejo de plantas daninhas.

Glifosato; Planta daninha

Extratos de Morinda citrifolia e Piper nigrum no controle da mancha bacteriana do maracujazeiro.

Suplemento, ref. 886. Edição dos Resumos do 45º Congresso Brasileiro de Fitopatologia, Manaus, 2012. CBFito 2012

Arquitetura da informação dos sites da Agropedia brasilis.

Agropedia brasilis é mais um dos esforços empreendidos na empresa para compatibilizar suas necessidades com as possibilidades oferecidas pelas tecnologias de informação e comunicação. O que se buscou neste trabalho foram os elementos necessários para uma estrutura inicial que atendesse aos interesses mais imediatos dos usuários

Anisotropy of Thermal Conductivity and Possible Signature of the Fulde-Ferrell-Larkin-Ovchinnikov state in CeCoIn_5

We have measured the thermal conductivity of the heavy-fermion superconductor CeCoIn_5 in the vicinity of the upper critical field, with the magnetic field perpendicular to the c axis. Thermal conductivity displays a discontinuous jump at the superconducting phase boundary below critical temperature T_0 ~ 1 K, indicating a change from a second to first order transition and confirming the recent results of specific heat measurements on CeCoIn_5. In addition, the thermal conductivity data as a function of field display a kink at a field H_k below the superconducting critical field, which closely coincides with the recently discovered anomaly in specific heat, tentatively identified with the appearance of the spatially inhomogeneous Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) superconducting state. Our results indicate that the thermal conductivity is enhanced within the FFLO state, and call for further theoretical investigations of the order parameter's real space structure (and, in particular, the structure of vortices) and of the thermal transport within the inhomogeneous FFLO state.Comment: 19 pages, 6 figures, submitted to Prhys. Rev.