Late time cosmological approach in mimetic f(R,T)f(R,T) gravity

In this paper, we investigate the late-time cosmic acceleration in mimetic $f(R,T)$ gravity with Lagrange multiplier and potential in a Universe containing, besides radiation and dark energy, a self-interacting (collisional) matter. We obtain through the modified Friedmann equations, the main equation that can describe the cosmological evolution and with several models from $Q(z)$ and the well known particular model $f(R, T)$, we perform an analysis of the late-time evolution. We examine the behavior of the Hubble parameter, the dark energy equation of state and the total effective equation of state and we compare in each case the resulting picture with the non-collisional matter (assumed as dust) and also with the collisional matter in mimetic $f(R, T)$ gravity. The results obtained are in good agreement with the observational data and show that in presence of the collisional matter the dark energy oscillations in mimetic f(R, T) gravity can be damped.Comment: 18 pages, 2 figure

Late time cosmological approach in mimetic f(R,T)f(R,T) gravity

In this paper, we investigate the late-time cosmic acceleration in mimetic $f(R,T)$ gravity with Lagrange multiplier and potential in a Universe containing, besides radiation and dark energy, a self-interacting (collisional) matter. We obtain through the modified Friedmann equations, the main equation that can describe the cosmological evolution and with several models from $Q(z)$ and the well known particular model $f(R, T)$, we perform an analysis of the late-time evolution. We examine the behavior of the Hubble parameter, the dark energy equation of state and the total effective equation of state and we compare in each case the resulting picture with the non-collisional matter (assumed as dust) and also with the collisional matter in mimetic $f(R, T)$ gravity. The results obtained are in good agreement with the observational data and show that in presence of the collisional matter the dark energy oscillations in mimetic f(R, T) gravity can be damped.Comment: 18 pages, 2 figure

Observation of anisotropic diamagnetism above the superconducting transition in iron-pnictide Ba_(1-x)K_xFe2As2 single crystals due to thermodynamic fluctuations

High resolution magnetization measurements performed in a high quality Ba_(1-x)K_xFe2As2 single crystal allowed to determine the diamagnetism induced above the superconducting transition by thermally activated Cooper pairs. These data, obtained with magnetic fields applied along and transverse to the crystal ab layers, demonstrate experimentally that the superconducting transition of iron pnictides may be explained at a phenomenological level in terms of the Gaussian Ginzburg-Landau approach for three-dimensional anisotropic superconductors.Comment: Final version with minor corrections. 6 pages, 4 figure

Free amino acid and organic acid profile of Serpa PDO cheeses from distinct dairy industries

info:eu-repo/semantics/publishedVersio

Avaliação sazonal da atividade da fenilalanina amonia-liase e dos teores de fenois e taninos totais em Byrsonima verbascifolia Rich. ex. A. Juss.: uma especie medicinal do cerrado.

An experiment was conducted, ever month, from november, 2001 to september, 2002 in order to investigate the influence of seasonal variation of physical environment on gas exchange, on leaf water state, on the phenylalanine ammonia-lyase activity and on the total phenolic and tannin contents of murici,. The used area was a praire with a physionomy of Cerrado stricto sensu, located in Ijaci, south of the State of Minas Gerais. For the evaluation, plants Were selected with an average height of 2.70 +/- 0.21 m and an average basal diameter of 0.15 +/- 0.04 m. Leaf potential at 7 and 12 am and gas exchange at 10 and 12 am was evaluated ever month. The results showed that the leaf water potential was not significant seasonal variations indicating that the plants were in similar water conditions in both dry and rainy seasons. Higher photosynthetic and transpiration rates-were observed during rainy season. The net photosynthesis showed higher in the morning, although no significant variations of transpiration on the evaluating hours were observed. The stomatal conductance reached similar Values in both seasons, suggesting a participation of non-stomatal factors on the seasonal variation observed for the-gas exchange. It. was also observed significant seasonal variations on enzyme activity and total tannins contents. The increase of the phenylalanine ammonia-lyase activity and decrease Of the total tannins contents were characteristic of the dry season. The levels of total phenolics. had not varied significantly during the dry and rainy seasons, while the total tannin contents followed the photosynthetic response of plants, the enzyme activity was much more influenced by environmental conditions

Quantum cosmological perfect fluid models

Perfect fluid Friedmann-Robertson-Walker quantum cosmological models for an arbitrary barotropic equation of state $p = \alpha\rho$ are constructed using Schutz's variational formalism. In this approach the notion of time can be recovered. By superposition of stationary states, finite-norm wave-packet solutions to the Wheeler-DeWitt equation are found. The behaviour of the scale factor is studied by applying the many-worlds and the ontological interpretations of quantum mechanics. Singularity-free models are obtained for $\alpha \alpha > - 1$.Comment: Latex file, 12 pages. New paragraphs in the Introduction and Conclusion, and other minor corrections in the text and in some formulas. Accepted for publication in General Relativity and Gravitatio

Obtenção de marcador molecular potencialmente envolvido com a resistência do cafeeiro à ferrugem.

O Projeto Brasileiro do Genoma Café (PBGC) gerou um banco de dados contendo mais de 200.000 ESTs (Expressed Sequence Tags). Em trabalho preliminar, o banco foi minerado por meio de análise in silico e identificaram-se várias seqüências potencialmente associadas à resistência do cafeeiro a patógenos. Visando verificar o envolvimento destas seqüências com a resistência do cafeeiro à ferrugem foram desenhados oligonucleotídeos iniciadores (primers) que amplificaram as seqüências mineradas. Noventa pares de oligonucleotídeos iniciadores específicos foram desenhados utilizando o programa computacional Primer3. A estabilidade dos oligonucleotídeos foi verificada por meio do programa PrimerSelect®. Diferentes concentrações dos componentes da reação de PCR foram analisadas. Para a amplificação no termociclador, foram avaliadas diferentes combinações de tempo e temperatura, incluindo touchdown PCR. Utilizando as condições de reação e amplificação otimizadas, 40 iniciadores foram testados em 12 genótipos resistentes e 12 susceptíveis a H. vastatrix. Destes, 29 resultaram em bandas únicas e bem definidas, sendo um polimórfico. Os demais 50 estão sendo testados por PCR. Este trabalho permitiu obter, até o momento, um marcador molecular polimórfico entre os dois grupos de indivíduos resistentes e susceptíveis. Para confirmar a possível ligação e seu potencial, o marcador está sendo testado em diferentes populações do Programa de Melhoramento da UFV/EPAMIG

Obtenção de ESTs potencialmente relacionadas à resistência do cafeeiro à ferrugem por meio de análise in silico.

A partir das informações geradas no Projeto Brasileiro do Genoma Café (PBGC) foram identificadas, por meio de análise in silico, seqüências potencialmente envolvidas na resistência a Hemileia vastatrix Berk. et Br. presentes nos cafeeiros. Foram usadas diferentes estratégias para minerar as seqüências de interesse. Inicialmente, palavras-chave que correspondem a termos relacionados aos mecanismos de resistência de plantas a patógenos foram obtidas da literatura e utilizadas como ?iscas? para mineração dos dados. Com o auxílio de ferramentas disponíveis na plataforma de bioinformática do PBGC, criaram-se projetos englobando as ESTs (Expressed Sequence Tags) relacionadas a cada uma destas palavras. Outra estratégia utilizada foi a busca por similaridades entre algumas seqüências envolvidas com a resistência do cafeeiro a doenças já publicadas com as seqüências do PBGC, por meio do algoritmo BLAST. Utilizou-se, também, o ?Electronic Northern?, uma ferramenta desenvolvida pelo Laboratório de Genômica e Expressão (LGE). A mineração, usando as três estratégias, identificou 8.968 seqüências do PBGC. O envolvimento ou ligação destas seqüências com genes de resistência à ferrugem do cafeeiro será confirmado, em trabalhos futuros, utilizando marcadores moleculares e técnicas de genômica funcional