Multiple Scattering: Dispersion, Temperature Dependence, and Annular Pistons

We review various applications of the multiple scattering approach to the calculation of Casimir forces between separate bodies, including dispersion, wedge geometries, annular pistons, and temperature dependence. Exact results are obtained in many cases.Comment: 15 pages, 12 figures, contributed to the Festschrift for Emilio Elizald

Biological control of banana black Sigatoka disease with Trichoderma.

A Sigatoka-negra causada por Mycosphaerella fijiensis é a doença mais destrutiva da bananeira em termos mundiais. O patógeno está em uma fase invasiva no Brasil e já se encontra distribuído na maior parte dos Estados do país. O potencial de 29 isolados de Trichoderma spp. para o controle da Sigatoka-negra foi estudado sob condições de campo. Quatro isolados foram capazes de reduzir significativamente a severidade da doença e foram selecionados para um segundo experimento de campo. O isolado 2.047 apresentou os melhores resultados e foi utilizado em testes de sensibilidade a fungicidas e produção massal. Esse isolado foi identificado como Trichoderma atroviride por meio do sequenciamento de fragmentos da regiões ITS do rDNA e tef-1? da RNA polymerase. Trichoderma atroviride foi tão efetivo no controle da Sigatoka-negra quanto o fungicida Azoxystrobin, que é recomendado para o controle da doença. O agente de controle biológico tem potencial para o controle da Sigatoka-negra e pode ser produzido em massa em arroz autoclavado para aplicações no campo

A Columnar Liquid Crystal with Permanent Polar Order

The self-assembly of axial dipolar subphthalocyanine molecules in the presence of electric fields leads to uniaxially oriented columnar liquid crystalline materials that exhibit permanent polarizationFunding from MINECO (MAT2012-38538-CO3-01, 02 and CTQ2012- 31914), MICINN and MEC (F.P.U. fellowship (JG), CTQ-2011- 24187/BQU, CTQ2011-23659 and Consolider-Ingenio Nanociencia Molecular, CDS2007-00010), Comunidad de Madrid (MADRISOLAR-2, S2009/PPQ/1533), European Research Council (StG-279548), Aragon government, E04, Basque Country Government GI/IT-449-10, Generalitat Valenciana (PROMETEO/ 2012/053), and FEDER is acknowledge

Vacuum local and global electromagnetic self-energies for a point-like and an extended field source

We consider the electric and magnetic energy densities (or equivalently field fluctuations) in the space around a point-like field source in its ground state, after having subtracted the spatially uniform zero-point energy terms, and discuss the problem of their singular behavior at the source's position. We show that the assumption of a point-like source leads, for a simple Hamiltonian model of the interaction of the source with the electromagnetic radiation field, to a divergence of the renormalized electric and magnetic energy density at the position of the source. We analyze in detail the mathematical structure of such singularity in terms of a delta function and its derivatives. We also show that an appropriate consideration of these singular terms solves an apparent inconsistency between the total field energy and the space integral of its density. Thus the finite field energy stored in these singular terms gives an important contribution to the self-energy of the source. We then consider the case of an extended source, smeared out over a finite volume and described by an appropriate form factor. We show that in this case all divergences in local quantities such as the electric and the magnetic energy density, as well as any inconsistency between global and space-integrated local self-energies, disappear.Comment: 8 pages. The final publication is available at link.springer.co

Homeopatila 100® no desempenho zootécnico, infecções de brânquias, histologia hepática e parâmetros sanguíneos de tambaqui Colossoma macropomum.

MAN004

Spin Seebeck effect in insulating epitaxial ¿-Fe2O3 thin films

We report the fabrication of high crystal quality epitaxial thin films of maghemite (¿-Fe2O3), a classic ferrimagnetic insulating iron oxide. Spin Seebeck effect (SSE) measurements in ¿-Fe2O3/Pt bilayers as a function of sample preparation conditions and temperature yield a SSE coefficient of 0.5(1) µV/K at room temperature. Dependence on temperature allows us to estimate the magnon diffusion length in maghemite to be in the range of tens of nanometers, in good agreement with that of conducting iron oxide magnetite (Fe3O4), establishing the relevance of spin currents of magnonic origin in magnetic iron oxides

Evaluation of the Casimir Force for a Dielectric-diamagnetic Cylinder with Light Velocity Conservation Condition and the Analogue of Sellmeir's Dispersion Law

We study the Casimir pressure for a dielectric-diamagnetic cylinder subject to light velocity conservation and with a dispersion law analogous to Sellmeir's rule. Similarities to and differences from the spherical case are pointed out.Comment: 19 pages Latex, no figures; discussion expanded. To appear in Physica Script

Vacuum energy in conical space with additional boundary conditions

Total vacuum energy of some quantized fields in conical space with additional boundary conditions is calculated. These conditions are imposed on a cylindrical surface which is coaxial with the symmetry axis of conical space. The explicit form of the matching conditions depends on the field under consideration. In the case of electromagnetic field, the perfectly conducting boundary conditions or isorefractive matching conditions are imposed on the cylindrical surface. For a massless scalar field, the semi-transparent conditions ($\delta$-potential) on the cylindrical shell are investigated. As a result, the total Casimir energy of electromagnetic field and scalar field, per a unit length along the symmetry axis, proves to be finite unlike the case of an infinitely thin cosmic string. In these studies the spectral zeta functions are widely used. It is shown briefly how to apply this technique for obtaining the asymptotics of the relevant thermodynamical functions in the high temperature limit.Comment: 29 pages, 2 figures, the title was changed for a more adequate one, the abstract was rewritten, a few typos and minor grammar mistakes were correcte

Exogenous enzymes on the feeding of pirarucu Arapaima gigas Schinz. 1822 (Osteoglossiformes. Arapaimidae).

EN-US: The objective of this work was to verify the effect of exogenous digestive enzymes protease, lipase and amylase on the feeding of pirarucu. In a completely randomized design, we tested three levels of inclusion for both exogenous enzymes against a control commercial feed lacking any enzymatic enrichment. Inclusion levels were as follows: (Control) = no enzymes; (T1) = 0.1% Amylase; (T2) = 0.2% Amylase; (T3) = 0.4% Amylase; (T4) = Protease 0.1%; (T5) = Protease 0.2%; (T6) = Protease 0.4%; (T7) = Lipase 0.1%; (T8) = Lipase 0.2%; (T9) = Lipase 0.4% . After the end of the experiment it was possible to find a significant difference (p < 0.05) in relation to the Control treatment only in the zootechnical data of the treatments that added protease and lipase to the pirarucu feed (T4, T5, T6, T7, T8, T9). The use of exogenous digestive enzyme protease and lipase are indicating on the pirarucu feeding, as it positively influences its growth. | PT-BR: O objetivo deste trabalho foi verificar o efeito das enzimas digestivas exógenas protease, lipase e amilase na alimentação do pirarucu. Em um delineamento inteiramente casualizado foram testados três níveis de inclusão para ambas as enzimas exógenas frente a uma ração comercial controle ausente de qualquer enriquecimento enzimático. Os níveis de inclusão foram os seguintes: (Controle) = sem adição enzimas; (T1) = Amilase 0,1%; (T2) = Amilase 0,2%; (T3) = Amilase 0,4%; (T4) = Protease 0,1%; (T5) = Protease 0,2%; (T6) = Protease 0,4%; (T7) = Lipase 0,1%; (T8) = Lipase 0,2%; (T9) = Lipase 0,4%. Após o término do experimento foi possível encontrar diferença significativa (p<0,05), em relação ao tratamento Controle, nos dados zootécnicos dos tratamentos que adicionaram protease e lipase a alimentação do pirarucu (T4, T5, T6, T7, T8, T9). As enzimas digestivas exógenas protease e lipase são indicadas na alimentação do pirarucu, influenciando positivamente no seu crescimento