Ocorrência de Borrelia spp. em cultura de células embrionárias do carrapato Boophilus microplus (Acari: Ixodidae) no Estado do Mato Grosso do Sul, Brasil.

O presente trabalho teve como objetivo reportar a ocorrência de Borrelia spp. em culturas de células embrionárias de Boophilus microplus infectados naturalmente. Sete dias após o início de uma nova cultura primária de células embrionárias do carrapato B. microplus, incubadas a 31°C, notou-se que as células começaram a degenerar. Ao exame em microscópio de contraste de fase detectou-se a presença de microrganismos alongado e com grande mobilidade. Lâminas de microscópio confeccionadas com amostras do sobrenadante da cultura, hemolinfa e massa de ovos, coradas pelo May Grünwald- Giemsa, permitiram a visualização de espiroquetas. O exame morfológico do microrganismo e sua visualização em B. microplus sugere ser Borrelia spp

Spin-to-charge conversion and interface-induced spin Hall magnetoresistance in yttrium iron garnet/metallic bilayers

We report the investigation of spin-to-charge current interconversion process in hybrid structures of yttrium iron garnet (YIG)/metallic bilayers by means of two different experimental techniques: spin pumping effect (SPE) and spin Hall magnetoresistance (SMR). We demonstrate the evidence of a correlation between spin-to-charge conversion and SMR in bilayers of YIG/Pd, YIG/Pt, and YIG/IrMn. The correlation was verified directly in the spin Hall angles and the amplitudes of the voltage signals measured by the SPE and SMR techniques. The detection of SMR was carried out using the modulated magnetoresistance technique and lock-in amplifier detection. For these measurements, we present a simple model for the interpretation of the results. The results allow us to conclude that indeed the interface in the YIG/metallic bilayers has a dominant role in the spin-to-charge current conversion and SMR

Dirac-Surface-State-Dominated Spin to Charge Current Conversion in the Topological Insulator (Bi0.22Sb0.78)2Te3(Bi_{0.22}Sb_{0.78})_2Te_3 Films at Room Temperature

We report the spin to charge current conversation in an intrinsic topological insulator (TI) $(Bi_{0.22}Sb_{0.78})_2Te_3$ film at room temperature. The spin currents are generated in a thin layer of permalloy (Py) by two different processes, spin pumping (SPE) and spin Seebeck effects (SSE). In the first we use microwave-driven ferromagnetic resonance of the Py film to generate a SPE spin current that is injected into the TI $(Bi_{0.22}Sb_{0.78})_2Te_3$ layer in direct contact with Py. In the second we use the SSE in the longitudinal configuration in Py without contamination by the Nernst effect made possible with a thin NiO layer between the Py and $(Bi_{0.22}Sb_{0.78})_2Te_3$ layers. The spin-to-charge current conversion is attributed to the inverse Edelstein effect (IEE) made possible by the spin-momentum locking in the electron Fermi contours due to the Rashba field. The measurements by the two techniques yield very similar values for the IEE parameter, which are larger than the reported values in the previous studies on topological insulators.Comment: 18 pages and 7 figure

Theory for phonon pumping by magnonic spin currents

In recent years several experimental observations and theoretical predictions of unique phenomena involving the interplay between spin currents and the coupled magnetization-elastic dynamics have invigorated the field of spintronics. One important experiment reported several years ago showed that elastic waves can produce spin pumping, that is, generation of spin currents in a metallic film in contact with a ferromagnetic material. Very recently the Onsager reciprocal of this effect has been observed in samples made of a film of the insulating ferrimagnet yttrium iron garnet in contact with a platinum strip with nanoscopic silver particles that is known to exhibit a giant spin Hall effect. By passing an electric current through the metallic strip, the spin current generated by the spin Hall effect produces a large magnonic spin current that excites phonons with microwave frequency, observed by Brillouin light scattering. Here we show that these experiments are explained by a theory based on a process in which one magnon in the spin current creates one phonon and another magnon, with conservation of energy and momentum. The theoretical value of the critical charge current in the metallic strip necessary to drive phonons and the values of the phonon frequencies are in good agreement with the values measured experimentally

Screening for emerging metabolites by ESI-QTOF in arabica coffee under different roasting levels.

P.FC.6

Thermodynamic effects drive countergradient responses in the thermal performance of Littorina saxatilis across latitude.

Thermal performance curves (TPCs) provide a powerful framework to assess the evolution of thermal sensitivity in populations exposed to divergent selection regimes across latitude. However, there is a lack of consensus regarding the extent to which physiological adjustments that compensate for latitudinal temperature variation (metabolic cold adaptation; MCA) may alter the shape of TPCs, including potential repercussion on upper thermal limits. To address this, we compared TPCs for cardiac activity in latitudinally-separated populations of the intertidal periwinkle Littorina saxatilis. We applied a non-linear TPC modelling approach to explore how different metrics governing the shape of TPCs varied systematically in response to local adaptation and thermal acclimation. Both critical upper limits, and the temperatures at which cardiac performance was maximised, were higher in the northernmost (cold-adapted) population and displayed a countergradient latitudinal trend which was most pronounced following acclimation to low temperatures. We interpret this response as a knock-on consequence of increased standard metabolic rate in high latitude populations, indicating that physiological compensation associated with MCA may indirectly influence variation in upper thermal limits across latitude. Our study highlights the danger of assuming that variation in any one aspect of the TPC is adaptive without appropriate mechanistic and ecological context

Avaliação de atributos físicos do solo e desenvolvimento da cultivar tangor murcot em latossolo amarelo coeso sob efeito da subsolagem.

Objetivou-se avaliar os atributos físicos do solo sob efeito da subsolagem em Latossolo Amarelo Coeso de tabuleiro costeiro e conseqüências no desenvolvimento do cultivar tangor Murcott. O experimento foi instalado na Fazenda Lagoa do Coco, Litoral Norte do Estado da Bahia. O delineamento experimental foi em blocos ao acaso, com cinco tratamentos e seis repetições: T1- aração + gradagem; T2 - subsolagem com uma haste nas linhas de plantio; T3 - subsolagem cruzada, com uma haste, nas linhas de plantio; T4 - subsolagem com três hastes nas linhas de plantio e T5 - subsolagem cruzada, com três hastes, nas linhas de plantio. As seguintes variáveis foram avaliadas: resistência mecânica do solo à penetração, densidade do solo, crescimento radicular e da parte aérea, produtividade do pomar, abscisão (queda) e peso médio dos frutos. Para todas as variáveis avaliadas, o melhor tratamento de preparo do solo é o T4: a diferença de número e peso total de frutos entre os tratamentos T4 e T1 é de 63% e 83%, respectivamente; a queda de frutos no tratamento T1 é aproximadamente o triplo da observada nos tratamentos T4 e T5, mostrando que a subsolagem possibilita, além de maior produtividade, maior tempo de retenção dos frutos na planta