Publicações - ciências exatas e da terra
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Juliana Morais Missina;
Giovanna G Nunes;
Bruno Gavinho;
Kahoana Postal;
Francielli Santana;
Glaucio Valdameri;
SOUZA, Emanuel. M;
D. L. Hughes;
Marcel Ivan Ramirez;
Jaisa Fernandes Soares
Palavra-chave:
decavanadate;
Nicotinamide;
isonicotinamide;
E. coli;
Giardia
Áreas do conhecimento:
Ciências Exatas e da Terra; Ciência da Computação; Metodologia e Técnicas da Computação; Engenharia de Software;
Ciências Exatas e da Terra; Química; Química Inorgânica; Química Bio-Inorgânica
resumo ...
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Juliana Morais Missina;
NUNES, GIOVANA G.;
Bruno Gavinho;
Kahoana Postal;
Francielli Sousa Santana;
Glaucio Valdameri;
Emanuel Maltempi de Souza;
D. L. Hughes;
Marcel Ramirez;
Jaisa Fernandes Soares
Palavra-chave:
decavanadate;
organic cations;
Escherichia coli;
Giardia intestinalis;
Vero cells
Áreas do conhecimento:
Ciências Exatas e da Terra; Quimica Medicinal;
Ciências Exatas e da Terra; Química; Química Inorgânica; Química de Coordenação
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Decavanadate salts with nicotinamide (3-pyridinecarboxamide, 3-pca) and isonicotinamide (4-pyridinecarboxamide, 4-pca) in both neutral and protonated forms, (3-Hpca)4[H2V10O28]·2H2O·2(3-pca) (compl...
Complexes [{Na6(H2O)20V10O28·4H2O}n] (sodium decavanadate), (3-Hpca)4[H2V10O28]·2H2O·2(3-pca) and the novel (4-Hpca)4[H2V10O28]·2(4-pca) (pca = pyridinecarboxamide; 3-pca = nicotinamide; 4-pca = is...
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CIRO, DAVID;
CALDAS, I;
VIANA, R. L.;
EVANS, TODD E.
Palavra-chave:
Mapas de Poincare
Áreas do conhecimento:
Ciências Exatas e da Terra; Física; Física Geral; Dinamica Nao-Linear e Caos
resumo ...
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Joaquim Bonfim Santos Mendes;
Alex Aparecido Ferreira;
Jose Holanda;
Antonio Azevedo;
Sergio M Rezende
Palavra-chave:
spintrônica;
Two-dimensional material;
electrical transport;
transporte de spin
resumo ...
We report efficient spin to charge current conversion in the 2D transition metal dichalcogenide semiconductor MoS2 at room temperature. The spin current is generated by microwave-driven ferromagnet...
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MATOS, TASSYA T. S.;
Antonio Savio Mangrich;
CARDOSO, ESTELA M. C.;
SCHULTZ, JULIANA;
FORNARI, MAYARA R.;
Alberto Wisniewski;
CARREGOSA, INGRID S. C.
Palavra-chave:
EPR parameters
Áreas do conhecimento:
Ciências Exatas e da Terra; Ciência da Computação; Metodologia e Técnicas da Computação; Engenharia de Software
resumo ...
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WEISS, LUCIARA I.;
PINHO, ADRIANE S. F.;
S. E. MICHELIN;
Milton Massumi Fujimoto
THE EUROPEAN PHYSICAL JOURNAL. D, ATOMIC, MOLECULAR, OPTICAL AND PLASMA PHYSICS (ONLINE),
v. 72,
n. 2,
p. 35
2018
DOI
Palavra-chave:
Excitacao Eletronica Molecular;
Metodo de Ondas Distorcidas;
colisão pósitron-molécula
Áreas do conhecimento:
Ciências Exatas e da Terra; Física; Física Atômica e Molecular; Processos de Colisão e Interações de Átomos e Moléculas
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In this work we have applied for the first time the distorted-wave approximation (DWA) combined with Schwinger Variational Iterative Method (SVIM) to describe electronic excitation of H2 molecules by positron collisions. The integral (ICS) and differential (DCS) excitation cross sections for X1Σg+ → B1Σu+ transition of H2 molecule, in the range from near threshold up to 45 eV of positron energies, were reported in static (ST) and static-correlation-polarization (STPOL) levels. Our two-state ICS in DWA-ST level have quantitative agreement with experimental measurement at energies from threshold up to 18 eV and the inclusion of polarization effects increases the cross sections. Comparison with 2-state close-coupling approximation (CCA), 2-state Schwinger Multichannel (SMC), 5-state SMC and 1013-state from Convergent Close-Coupling (CCC) methods are done and is encouraging. The relative steeper drop above 22 eV in experimental ICS was not observed by any theoretical calculations indicating that new measurements would be interesting for this transition in this energy range.
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Sandra Maria Tieppo;
Sandro Marcos Guzzo
Jornal Eletrônico de Ensino e Pesquisa de Matemática - JEEPEMA,
v. 2,
n. 1,
p. 45-79,
2018
Home page
Palavra-chave:
Cálculo Fracionário;
derivada fracionária;
EDOs de Ordem Fracionária
Áreas do conhecimento:
Ciências Exatas e da Terra; Análise; Equações Diferenciais Parciais
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MOREIRA, THAIS FERNANDA;
MIGUEL, OBDULIO GOMES;
BAVIERA, AMANDA MARTINS;
SOARES, CHRISTIANE PIENNA;
BRUNETTI, IGUATEMY LOURENÇO;
SORBO, JULIANA MARIA;
SOUZA, FELIPE DE OLIVEIRA;
FERNANDES, BARBARA COLATTO;
OCAMPOS, FERNANDA MARIA MARINS;
DE OLIVEIRA, DANIELLA MARIA SOARES;
ARCARO, CARLOS ALBERTO;
ASSIS, RENATA PIRES;
Barison, Andersson
Áreas do conhecimento:
Ciências Exatas e da Terra; Química; Ressonancia Magnetica Nuclear;
Engenharias; Engenharia Química; Tecnologia Química; Produtos Naturais;
Ciências Exatas e da Terra; Química; Química Orgânica; Estrutura, Conformação e Estereoquímica
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There have been few studies on the pharmacological properties of <i>Rhamnus sphaerosperma</i> var. <i>pubescens</i>, a native Brazilian species popularly known as “fruto-de-pombo.” The aim of this study was to investigate the scavenging capacity of emodin, physcion, and the ethanolic crude extract of <i>Rhamnus sphaerosperma</i> var. <i>pubescens</i> against reactive oxygen and nitrogen species, as well as their role and plausible mechanisms in prompting cell death and changes in AKT phosphorylation after cervical (SiHa and C33A) and oral (HSC-3) squamous cell carcinoma treatments. Emodin was shown to be the best scavenger of NO<sup>•</sup> and O<sub>2</sub><sup>•−</sup>, while all samples were equally effective in HOCl/OCl<sup>−</sup> capture. Emodin, physcion, and the ethanolic extract all exhibited cytotoxic effects on SiHa, C33A, HSC-3, and HaCaT (immortalized human keratinocytes, nontumorigenic cell line), involving mixed cell death (apoptosis and necrosis) independent of the caspase activation pathway. Emodin, physcion, and the ethanolic extract increased intracellular oxidative stress and DNA damage. Emodin decreased the activation of AKT in all tumor cells, physcion in HSC-3 and HaCaT cells, and the ethanolic extract in C33A and HaCaT cells, respectively. The induction of cancer cell death by emodin, physcion, and the ethanolic crude extract of <i>Rhamnus sphaerosperma</i> var. <i>pubescens</i> was related to an increase in intracellular oxidative stress and DNA damage and a decrease in AKT activation. These molecules are therefore emerging as interesting candidates for further study as novel options to treat cervical and oral carcinomas.
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C. DE SOUSA, M.;
Marcus, F A;
L. CALDAS, I.;
VIANA, R. L.
Palavra-chave:
Caos
Áreas do conhecimento:
Ciências Exatas e da Terra; Áreas Clássicas de Fenomenologia e suas Aplicações; Mecânica, Elasticidade e Reologia
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Sandro Froehner;
Luiz Fernando Dombroski;
SCHLEDER, ALUANA ARIANE;
Ernani Francisco da Rosa Filho
Palavra-chave:
biodiesel;
Biodisponibilidade;
Controle Ambiental;
Hidrocarbonetos de petróleo
Áreas do conhecimento:
Engenharias; Engenharia Sanitária; Saneamento Ambiental; Qualidade do Ar, das Águas e do Solo;
Ciências Exatas e da Terra; Química; Química Ambiental
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The capacities of fatty esters and commercial biodiesel (i.e., mixture of fatty esters with fossil diesel) for solubilizing polycyclic aromatic hydrocarbons (PAHs) were investigated and were attributed to the property of fatty esters forming aggregates and internally accommodating such compounds. Different systems formed by solely fatty esters and commercial biodiesel were investigated to study the effect of the structure of fatty esters on the solubility of PAHs. In the presence of ethyl oleate, the solubility of naphthalene increased by 23 ± 1.3%, that of phenanthrene by 1.4 ± 0.7%, and those of anthracene and pyrene by 1.1 ± 0.6%. The maximum solubility values of PAHs indicated that fatty esters exerted a positive effect on solubility in the same way as a surfactant (ionic and neutral). In the presence of a mixture of fatty esters, the maximum concentration of naphthalene solubilized was 105.5 ± 2.5 mg/L, a 3.7-fold increase compared to its solubility in water. The same behavior was observed for other compounds like pyrene and phenanthrene. However, they were dissolved in different proportions due to the different physico-chemical properties and chemical structure of each compound. Considering the presence of PAHs in fossil diesel, the potential of fatty esters was assessed when mixed with fossil diesel, commercial available as biodiesel, which showed increase in the solubility of PAHs in the aqueous phase. In the absence of fatty esters, when only fossil diesel was present, the maximum concentrations of naphthalene and phenanthrene were 136.3 ± 3.9 and 1.28 ± 0.07 μg/L, respectively, while the maximum values in the presence of a blend of fossil diesel and biodiesel were 437.6 ± 16.7 and 26.8 ± 4.5 μg/L for naphthalene and phenanthrene, respectively. Therefore, it was reasonable to affirm that fatty esters interfered in the solubilities of PAHs, which might be associated with the formation of aggregates.
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