Dynamical matrix for arbitrary quadratic fermionic bath Hamiltonians and non-Markovian dynamics of one and two qubits in an Ising model environment

We obtain the analytical expression for the Kraus decomposition of the quantum map of an environment modeled by an arbitrary quadratic fermionic Hamiltonian acting on one or two qubits, and derive simple functions to check the non-positivity of the intermediate map. These functions correspond to two different sufficient criteria for non-Markovianity. In the particular case of an environment represented by the Ising Hamiltonian, we discuss the two sources of non-Markovianity in the model, one due to the finite size of the lattice, and another due to the kind of interactions.Comment: 11 pages, 10 figure

The effect of erythrosine-B on the structuration of poloxamer 407 and cellulose derivative blends: in silico modelling supporting experimental studies

© 2021 Elsevier B.V. All rights reserved. This is the accepted manuscript version of an article which has been published in final form at https://doi.org/10.1016/j.msec.2021.112440Erythrosine is a dye approved for medical use that has shown promising photodynamic activity, allowing for the inactivation of microorganisms and activity against malignant cells. Despite the great photodynamic potential, erythrosine exhibits hydrophilicity, negatively impacting its action in biological membranes. Therefore, the incorporation of erythrosine in micellar polymeric systems, such as poloxamers, may overcome this limitation. Moreover, using bioadhesive and thermoresponsive polymers to combine in situ gelation and bioadhesion may enhance retention of this topically applied drug. In this work, mucoadhesive and thermoresponsive micellar systems were prepared containing erythrosine in two states: the native form (ERI) and the disodium salt (ERIs). The systems were evaluated based on the effect of ERI/ERIs on the micellar structure of the binary polymer mixtures. Optimised combinations of poloxamer 407 (polox407) and mucoadhesive sodium carboxymethylcellulose (NaCMC) or hydroxypropyl methylcellulose (HPMC) were used as micellar systems for ERI or ERIs delivery. The systems were studied with respect to theoretical interactions, qualitative composition, morphology, and micellar properties. In silico modelling indicated a higher interaction of the drug with poly(ethylene oxide) (PEO) than poly(propylene oxide) (PPO) fragments of polox407. Systems containing NaCMC displayed a repulsive effect in the presence of erythrosine, due to the polymer's charge density. Both systems could convert the photosensitizer in its monomeric form, ensuring photodynamic activity. In these mixtures, crystallinity, critical micellar temperature and enthalpy of polox407 micellisation were reduced, and micellar size, evaluated by transmission electron microscopy (TEM), showed low impact of ERI/ERIs in HPMC preparations. Aiming toward photodynamic applications, the findings showed how ERI or ERIs can affect the micellar formation of gels composed of 17.5% (w/w) polox407 and 3% (w/w) HPMC or 1% (w/w) NaCMC, important for understating their behaviour and future utilisation as erythrosine delivery systems.Peer reviewe

Influencia da cultivar de morangueiro sobre as populações do ácaro-rajado e do predador Neoseiulus californicus.

Este trabalho teve por objetivo determinar a influência de diferentes cultivares de morangueiro sobre as populações do ácaro-rajado e do ácaro predador Neoseiulus californicus, em cultivo orgânico de morangueiro.Editores técnicos: Harley Nonato de Oliveira, Crébio José Avila e Fabrício Fagundes Pereira; SICONBIOL. Resumo

Atividade antifúngica de escopoletina sobre Rhizoctonia solani.

Na região Norte, a queima foliar (Rhizoctonia solani) destaca-se entre as doenças da cultura do maracujazeiro principalmente no período chuvoso, cujos danos são ocasionados pela intensa desfolha em plantas mais afetadas. A utilização de substâncias extraídas de plantas têm mostrado resultados promissores no controle de fitopatógenos. A escopoletina é uma cumarina encontrada em grande número de espécies vegetais. Assim, o objetivo deste trabalho foi avaliar o efeito de diferentes concentrações de escopoletina sobre o crescimento de Rhizoctonia solani. A substância foi incorporada ao meio de cultura Batata Dextrose Ágar (BDA) nas concentrações de 0, 10, 20, 30,40 e 50 ppm. Após a solidificação do meio, depositou-se um disco de 8 mm de diâmetro de micélio do fungo no centro de cada placa. A determinação do crescimento micelial foi realizada diariamente com auxílio de um paquímetro. O delineamento experimental foi inteiramente casualizado com 6 tratamentos e 5 repetições. Todos os tratamentos reduziram significativamente o crescimento micelial de Rhizoctonia solani, sendo que as concentrações de 30, 40 e 50 ppm apresentaram controle acima de 80,34% em relação a testemunha