PT-symmetry from Lindblad dynamics in a linearized optomechanical system

We analyze a lossy linearized optomechanical system in the red-detuned regime under the rotating wave approximation. This so-called optomechanical state transfer protocol provides effective lossy frequency converter (quantum beam-splitter-like) dynamics where the strength of the coupling between the electromagnetic and mechanical modes is controlled by the optical steady-state amplitude. By restricting to a subspace with no losses, we argue that the transition from mode-hybridization in the strong coupling regime to the damped-dynamics in the weak coupling regime, is a signature of the passive parity-time (PT) symmetry breaking transition in the underlying non-Hermitian quantum dimer. We compare the dynamics generated by the quantum open system (Langevin or Lindblad) approach to that of the PT-symmetric Hamiltonian, to characterize the cases where the two are identical. Additionally, we numerically explore the evolution of separable and correlated number states at zero temperature as well as thermal initial state evolution at room temperature. Our results provide a pathway for realizing non-Hermitian Hamiltonians in optomechanical systems at a quantum level

Controle biológico de percevejos fitófagos da soja na região de Dourados, MS.

Este trabalho teve como objetivo avaliar o parasitismo natural que ocorre em adultos e em ovos do percevejo-marrom da soja Euschistus heros (Fabricius), bem como multiplicar o parasitóide Telenomus podisi (Ashmead) e liberá-lo em lavouras de soja, visando ao controle biológico do percevejo nesta cultura. Durante a safra 2004/2005 e 2005/2006 e nas entressafras de 2004, 2005 e 2006 foram coletados adultos do percevejo, enquanto nas safras de 2003/2004 e 2004/2005 foram coletadas massas de ovos do inseto durante o período reprodutivo da sojabitstream/item/38732/1/BP200740.pdfDocumento on-line

Gene expression analysis in cold stress conditions reveals BBX20 and CLO as potential biomarkers for cold tolerance in almond

Late spring frosts can become one of the limiting factors for the expansion of cultivation area towards a harsher climate for the almond [Prunus amygdalus Batsch syn P. dulcis (Mill.) D.A. Webb] crop as spring frost can damage up to 90% of the harvest. In order to identify key genes favoring cold tolerance in almonds, branches from three late-blooming genotypes: ‘Guara’, ‘Soleta’ and ‘Belona’ were exposed at -4¿C during 24 h in a constant climate chamber. Phenotype analysis showed that ‘Guara’ and ‘Soleta’ had a greater acclimation capacity to cold than ‘Belona’. The qRT-PCR BioMark System technology was used to monitor the relative expression of 30 candidate genes with a potential relation to cold response, which are either involved in the ICE-CBF-COR pathway or the independent CBF pathway, and also genes not yet characterized or with unknown function in almond genome. Differences in the gene expression profiles were found among the three studied genotypes and the three time-points of cold exposure (0, 2 and 24 h). BBX20 and CLO genes behaved as differentiator genes between tolerant and susceptible genotypes in cold stress response in almond pistils. In addition, the differences of expression among the tolerant genotypes suggested the intervention of different mechanisms responding to cold stress in almonds. © 2021 by the authors. Licensee MDPI, Basel, Switzerland

Avaliação da coleção de germoplasma de melancia da Embrapa Hortaliças para tolerância a virose.

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