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Simões Filho, Brazil

Grande M.,Instituto Federal da Bahia | Grande M.,Federal University of Campina Grande | Galvao C.,Federal University of Campina Grande | Miranda L.,Federal University of Campina Grande | Rufino I.,Federal University of Campina Grande
IAHS-AISH Proceedings and Reports | Year: 2014

Environmental equity is a concept derived from the (un)equal exposure to environmental degradation by different social groups, usually minorities and low-income people exposed to major environmental risks, also known as environmental justice. It is assumed that no group of people, independent of race, ethnicity or socioeconomic class, should support, either in concentrated or unevenly distributed form, the negative environmental impacts resulting from industrial, agricultural, commercial and infrastructure activities or government programs and policies. In this paper the concept of environmental equity is explored as a criterion for water management through the analysis of a typical coupled human-natural system: the Epitácio Pessoa Reservoir, located in the semi-arid region of Brazil. Inefficient water resource management has caused unequal access to water by the population, particularly during drought periods. However, census data indicate that population have practically the same access to water, which actually is not able to reflect the actual picture. This study argues that environmental equity can be an additional criterion to improve water management. Copyright © 2014 IAHS Press.

Ribeiro E.M.D.O.,Federal University of Bahia | Lima L.S.,Instituto Federal da Bahia | David J.M.,Federal University of Bahia | Vale A.E.D.,Federal University of Bahia | And 2 more authors.
Phytochemistry Letters | Year: 2013

A new tropane alkaloid, named the 7β-acetoxy-3β,6β- dibenzoyloxytropane (1), was isolated from a methanol extract of Erythroxylum rimosum O.E. Schulz leaves. Other known compounds were detected, including quercetin, kaempferol-3-O-α-l-arabinofuranoside, (+)-catechin, epicatechin, quercetin-3-O-α-arabinofuranoside, quercetin-3-O-α- arabinopyranoside, quercetin-3-O-β-arabinopyranoside, quercetin-3-β- glucopyranoside, kaempferol, quercetin-3-O-β-galactopyranoside, β-sitosterol, α-amyrin, β-amyrin, and the ester derivatives of these two amyrins. Compound 1 exhibited weak inhibition of acetylcholinesterase. Structural identification was performed using IR, ESIHRMS and one- and two-dimensional NMR data analyses and confirmed by comparison with literature data. © 2013 Phytochemical Society of Europe.

Sales J.H.,State University of Santa Cruz | Suzuki A.T.,Sao Paulo State University | Santos G.S.,Federal University of Espirito Santo | Lima C.A.,Instituto Federal da Bahia
Few-Body Systems | Year: 2015

We calculate the correction to the propagator of two bosons up to the g4 order in the “cross-ladder” approximation in the light front. The hierarchy of the coupled equations describe the propagator of two bosons in various cases, including the “cross-ladder” approximation. Our results show that the contribution of the pair is small and is limited to a range of bound state. © 2015, Springer-Verlag Wien.

Silveira S.T.,Institute Investigacion En Ciencias Of La Alimentacion Cial | Silveira S.T.,Instituto Federal da Bahia | Martinez-Maqueda D.,Institute Investigacion En Ciencias Of La Alimentacion Cial | Recio I.,Institute Investigacion En Ciencias Of La Alimentacion Cial | Hernandez-Ledesma B.,Institute Investigacion En Ciencias Of La Alimentacion Cial
Food Chemistry | Year: 2013

Dipeptidyl peptidase-IV (DPP-IV) is a serine protease involved in the degradation and inactivation of incretin hormones that act by stimulating glucose-dependent insulin secretion after meal ingestion. DPP-IV inhibitors have emerged as new and promising oral agents for the treatment of type 2 diabetes. The purpose of this study was to investigate the potential of β-lactoglobulin as natural source of DPP-IV inhibitory peptides. A whey protein concentrate rich in β-lactoglobulin was hydrolysed with trypsin and fractionated using a chromatographic separation at semipreparative scale. Two of the six collected fractions showed notable DPP-IV inhibitory activity. These fractions were analysed by HPLC coupled to tandem mass spectrometry (HPLC-MS/MS) to identify peptides responsible for the observed activity. The most potent fragment (IPAVF) corresponded to β-lactoglobulin f(78-82) which IC 50 value was 44.7 u.M. The results suggest that peptides derived from β-lactoglobulin would be beneficial ingredients of foods against type 2 diabetes. © 2013 Elsevier Ltd. All rights reserved.

Miranda W.,Instituto Federal da Bahia | Miranda W.,Federal University of Bahia | Carneiro S.,Federal University of Bahia | Pigozzo C.,Federal University of Bahia
Journal of Cosmology and Astroparticle Physics | Year: 2014

We investigate the observational effects of a quintessence model in an anisotropic spacetime. The anisotropic metric is a non-rotating particular case of a generalized Gödel's metric and is classified as Bianchi III. This metric is an exact solution of the Einstein-Klein-Gordon field equations with an anisotropic scalar field ψ, which is responsible for the anisotropy of the spacetime geometry. We test the model against observations of type Ia supernovae, analyzing the SDSS dataset calibrated with the MLCS2k2 fitter, and the results are compared to standard quintessence models with Ratra-Peebles potentials. We obtain a good agreement with observations, with best values for the matter and curvature density parameters ΩM = 0.29 and Ωk= 0.01 respectively. We conclude that present SNe Ia observations cannot, alone, distinguish a possible anisotropic axis in the cosmos. © 2014 IOP Publishing Ltd and Sissa Medialab srl .

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