BEC-BCS crossover in a cold and magnetized two color NJL model

The BEC-BCS crossover for a NJL model with diquark interactions is studied in the presence of an external magnetic field. Particular attention is paid to different regularization schemes used in the literature. A thorough comparison of results is performed for the case of a cold and magnetized two-color NJL model. According to our results, the critical chemical potential for the BEC transition exhibits a clear inverse magnetic catalysis effect for magnetic fields in the range $1 \lesssim eB/m_\pi^2 \lesssim 20$. As for the BEC-BCS crossover, the corresponding critical chemical potential is very weakly sensitive to magnetic fields up to $eB \sim 9\ m_\pi^2$, showing a much smaller inverse magnetic catalysis as compared to the BEC transition, and displays a strong magnetic catalysis from this point on.Comment: 15 pages, 8 figures; v2 PRD versio

Nitrous oxide distribution and its origin in the central and eastern South Pacific Subtropical Gyre

The mechanisms of microbial nitrous oxide (N<sub>2</sub>O) production in the ocean have been the subject of many discussions in recent years. New isotopomeric tools can further refine our knowledge of N<sub>2</sub>O sources in natural environments. This study compares hydrographic, N<sub>2</sub>O concentration, and N<sub>2</sub>O isotopic and isotopomeric data from three stations along a coast-perpendicular transect in the South Pacific Ocean, extending from the center (Sts. GYR and EGY) of the subtropical oligotrophic gyre (~26° S; 114° W) to the upwelling zone (St. UPX) off the central Chilean coast (~34° S). Although AOU/N<sub>2</sub>O and NO<sub>3</sub><sup>−</sup> trends support the idea that most of the N<sub>2</sub>O (mainly from intermediate water (200–600 m)) comes from nitrification, N<sub>2</sub>O isotopomeric composition (intramolecular distribution of <sup>15</sup>N isotopes) expressed as SP (site preference of <sup>15</sup>N) shows low values (10 to 12permil) that could be attributed to the production through of microbial nitrifier denitrification (reduction of nitrite to N<sub>2</sub>O mediated by ammonium oxidizers). The coincidence of this SP signal with high – stability layer, where sinking organic particles can accumulate, suggests that N<sub>2</sub>O could be produced by nitrifier denitrification inside particles. It is postulated that deceleration of particles in the pycnocline can modify the advection - diffusion balance inside particles, allowing the accumulation of nitrite and O<sub>2</sub> depletion suitable for nitrifier denitrication. As lateral advection seems to be relatively insignificant in the gyre, in situ nitrifier denitrification could account for 40–50% of the N<sub>2</sub>O produced in this layer. In contrast, coastal upwelling system is characterized by O<sub>2</sub> deficient condition and some N deficit in a eutrophic system. Here, N<sub>2</sub>O accumulates up to 480% saturation, and isotopic and isotopomer signals show highly complex N<sub>2</sub>O production processes, which presumably reflect both the effect of nitrification and denitrification at low O<sub>2</sub> levels on N<sub>2</sub>O production, but net N<sub>2</sub>O consumption by denitrification was not observed

Exciton trapping in magnetic wire structures

The lateral magnetic confinement of quasi two-dimensional excitons into wire like structures is studied. Spin effects are take into account and two different magnetic field profiles are considered, which experimentally can be created by the deposition of a ferromagnetic stripe on a semiconductor quantum well with magnetization parallel or perpendicular to the grown direction of the well. We find that it is possible to confine excitons into one-dimensional (1D) traps. We show that the dependence of the confinement energy on the exciton wave vector, which is related to its free direction of motion along the wire direction, is very small. Through the application of a background magnetic field it is possible to move the position of the trapping region towards the edge of the ferromagnetic stripe or even underneath the stripe. The exact position of this 1D exciton channel depends on the strength of the background magnetic field and on the magnetic polarisation direction of the ferromagnetic film.Comment: 10 pages, 7 figures, to be published in J. Phys: Condens. Matte

Fungos associados às sementes de tento e maranhoto.

A utilização de sementes sadias é fundamental para o sucesso de um empreendimento florestal. O objetivo deste trabalho foi identificar e quantificar os fungos associados às sementes de tento (Ormosia sp.) e maranhoto (Phyllanthus nobilis (L. f.) Müll. Arg). Os experimentos foram realizados no Laboratório de Fitopatologia da Embrapa Amazônia Oriental, em Belém, Pará. As sementes testadas foram cedidas pelo Laboratório de Sementes Florestais da Embrapa Amazônia Oriental. Foram analisadas 50 sementes de tento e 50 de maranhoto, originárias de Belterra e Bonito, estado do Pará. As amostras foram divididas em sub-amostras de 25 sementes, com e sem assepsia, para realização dos testes de sanidade em meio de cultura de Batata-Dextrose-Agar (BDA). As sementes contaminadas foram analisadas e lâminas das culturas fúngicas foram avaliadas sob microscópio óptico. Aspergillus sp. foi o único fungo detectado nas duas espécies. A infestação nas sementes de maranhoto e tento, com assepsia, foi de 8% e 36%, enquanto que, nas sem assepsia, foi de 80% e 44%, respectivamente. A assepsia utilizada nos ensaios (hipoclorito de sódio a 1%, por cinco minutos) mostrou maior eficiência nas sementes de maranhoto do que de nas de tento, visto que nestas últimas o índice de infestação por Aspergillus foi considerado alto quando comparado com o tratamento sem assepsia