Origem das paisagens.

Domínios geomorfológicos do Ceará. Planície costeira do Ceará. Tabuleiros costeiros. Chapada do Apodi. Chapada do Araripe. Chapada Ibiapaba. Depressão sertaneja. Depressões sedimentares em meio à superfície sertaneja. Maciços residuais cristalinos

Efeito de banhos terapêuticos com formalina sobre indicadores de estresse em tambaqui.

O objetivo deste trabalho foi avaliar o efeito de concentrações terapêuticas de formalina na homeostase de tambaqui (Colossoma macropomum Cuvier 1818) por meio de índices fisiológicos

Densidade de estocagem de juvenis de tambaqui durante a recria em tanques-rede.

O objetivo deste trabalho foi determinar a densidade de estocagem mais adequada para a fase de recria de juvenis de tambaqui (Colossoma macropomum) em tanque-rede

Similaridade florística em duas áreas de Cerrado, localizadas no município de Parnarama, Maranhão - Brasil.

Pelo fato do Cerrado ser um dos biomas de grande importância e também um dos mais impactados pela atividade humana no Brasil, esse trabalho teve como objetivo realizar uma similaridade florística em duas áreas de Cerrado localizadas no município de Parnarama, Maranhão ? Brasil. Nas duas áreas foram locadas 41 parcelas, sendo distribuídas 24 na área I e 17 na área II, onde todos os indivíduos com CAP ? 31,4 cm (DAP ? 10 cm) foram mensurados bem como suas respectivas alturas e identificados botanicamente. Para análise da similaridade florística foi utilizado a distância euclidiana pelo método de Ward. Como resultado, as duas áreas apresentaram trechos distintos entre si, a área I apresentou maior diversidade e número de espécies, podendo ser classificada como uma área de cerradão. Já a segunda área vem se regenerando e desenvolvendo e, caso não haja nenhuma intervenção antrópica, a mesma poderá vir a se tornar um remanescente florestal secundário

Convergence to equilibrium under a random Hamiltonian

We analyze equilibration times of subsystems of a larger system under a random total Hamiltonian, in which the basis of the Hamiltonian is drawn from the Haar measure. We obtain that the time of equilibration is of the order of the inverse of the arithmetic average of the Bohr frequencies. To compute the average over a random basis, we compute the inverse of a matrix of overlaps of operators which permute four systems. We first obtain results on such a matrix for a representation of an arbitrary finite group and then apply it to the particular representation of the permutation group under consideration.Comment: 11 pages, 1 figure, v1-v3: some minor errors and typos corrected and new references added; v4: results for the degenerated spectrum added; v5: reorganized and rewritten version; to appear in PR

Diversidade morfológica e cultural de Trichoderma spp. em solos cultivados majoritariamente com o feijoeiro comum.

O objetivo desse trabalho foi estabelecer uma coleção de isolados de Trichoderma spp. para controle de patógenos habitantes do solo que afetam a produção do feijoeiro comum, e identificar em nível de espécie morfológica os isolados obtidos.CONAFE

Faithful Squashed Entanglement

Squashed entanglement is a measure for the entanglement of bipartite quantum states. In this paper we present a lower bound for squashed entanglement in terms of a distance to the set of separable states. This implies that squashed entanglement is faithful, that is, strictly positive if and only if the state is entangled. We derive the bound on squashed entanglement from a bound on quantum conditional mutual information, which is used to define squashed entanglement and corresponds to the amount by which strong subadditivity of von Neumann entropy fails to be saturated. Our result therefore sheds light on the structure of states that almost satisfy strong subadditivity with equality. The proof is based on two recent results from quantum information theory: the operational interpretation of the quantum mutual information as the optimal rate for state redistribution and the interpretation of the regularised relative entropy of entanglement as an error exponent in hypothesis testing. The distance to the set of separable states is measured by the one-way LOCC norm, an operationally-motivated norm giving the optimal probability of distinguishing two bipartite quantum states, each shared by two parties, using any protocol formed by local quantum operations and one-directional classical communication between the parties. A similar result for the Frobenius or Euclidean norm follows immediately. The result has two applications in complexity theory. The first is a quasipolynomial-time algorithm solving the weak membership problem for the set of separable states in one-way LOCC or Euclidean norm. The second concerns quantum Merlin-Arthur games. Here we show that multiple provers are not more powerful than a single prover when the verifier is restricted to one-way LOCC operations thereby providing a new characterisation of the complexity class QMA.Comment: 24 pages, 1 figure, 1 table. Due to an error in the published version, claims have been weakened from the LOCC norm to the one-way LOCC nor

Respostas fisiológicas de tambaqui a banhos terapêuticos com mebendazol.

O objetivo deste trabalho foi avaliar as respostas fisiológicas de juvenis de tambaqui a banhos terapêuticos com mebendazol

Distinctive effects of allochthonous and autochthonous organic matter on CDOM spectra in a tropical lake

Despite the increasing understanding about differences in carbon cycling between temperate and tropical freshwater systems, our knowledge on the importance of organic matter (OM) pools on light absorption properties in tropical lakes is very scarce. We performed a factorial mesocosm experiment in a tropical lake (Minas Gerais, Brazil) to evaluate the effects of increased concentrations of al-lochthonous and autochthonous OM, and differences in light availability on the light absorption characteristics of chromophoric dissolved organic matter (CDOM). Autochthonous OM deriving from phytoplankton (similar to Chl a) was stimulated by addition of nutrients, while OM from degradation of terrestrial leaves increased allochthonous OM, and neutral shading was used to manipulate light availability. Effects of the additions and shading on DOC, Chl a, nutrients, total suspended solid concentrations (TSM) and spectral CDOM absorption were monitored every 3 days. CDOM quality was characterized by spectral indices (S250-450, S275-295, S350-450, S-R and SUVA(254)). Effects of carbon sources and shading on the spectral CDOM absorption was investigated through principal component (PCA) and redundancy (RDA) analyses. The two different OM sources affected CDOM quality very differently and shading had minor effects on OM levels, but significant effects on OM quality, especially in combination with nutrient additions. Spectral indices (S250-450 and S-R) were mostly affected by allochthonous OM addition. The PCA showed that enrichment by allochthonous carbon had a strong effect on the CDOM spectra in the range between 300 and 400 nm, while the increase in autochthonous carbon increased absorption at wavelengths below 350 nm. Our study shows that small inputs of allochthonous OM can have large effects on the spectral light absorption compared to large production of autochthonous OM, with important implications for carbon cycling in tropical lakes.Peer reviewe