305 research outputs found
Acceptance of dishes based on mechanically separated meat of tambaqui (Colossoma macropomum) in a public school, Brazil.
In Brazil, due to economic and social factors, public policies are needed to grant access to quality nutrition in school. This provision should respect the local food culture; however, in the North, the region with the highest production of inland fisheries, fish consumption among students is still very low. The aim of the present study is to characterize Tambaqui (Colossoma macropomum) MSM, suggest planned school dishes based on this MSM and assesses their acceptability among students at the elementary and high school levels in northern Brazil. The study was carried out over one month and was a quantitative (hedonic scale and leftover/intake index) and qualitative research about preference. The participants were 120 elementary- and high-school students chosen randomly after they were authorized by their parents or legal guardians. Fish-based dishes were inserted in the diet of schoolchildren and their acceptability was evaluated. The children were also inquired about their fish consumption routines. The statistical analyses used were frequency tables and chi-squared independence test associated with Fisher?s exact test. Two dishes were well accepted by the students; however, the results showed that fish acceptance among younger students are higher than among adolescents. So, policies that promote fish intake and a healthy lifestyle must be stimulated since the early grades
Inibição de crescimento de plantas espontâneas por leguminosas herbáceas perenes na Caatinga Mineira - primeiro ano.
Publicado também na: Revista Brasileira de Agroecologia, v. 6. n. 2, dez. 2011
Insegurança alimentar em comunidades quilombolas: um estudo transversal.
Este estudo tem objetivo de analisar os fatores associados à insegurança alimentar e nutricional em comunidades quilombolas do estado do Tocantins, Região Norte do Brasil. Estudo de desenho transversal, realizado em 4 comunidades quilombolas do Norte do Brasil. Foram analisadas características socioeconômicas e demográficas por meio de um formulário semiestruturado e, o nível de insegurança alimentar foi mensurado pela Escala Brasileira de Insegurança Alimentar. Para analisar a aderência dos dados quantitativos à distribuição normal, utilizou-se o teste de Shapiro-Wilk. Para analisar a associação entre as características socioeconômicas e a prevalência de insegurança alimentar utilizou-se o teste de Qui-quadrado. Para estimar os fatores associados a insegurança alimentar, utilizou-se regressão de Poisson com variância robusta. O nível de significância adotado foi de 5%.Verificou-se uma prevalência de 71,2% (n=47) em situação de insegurança alimentar. Dos indivíduos que viviam em situação de insegurança alimentar, 15,79% (n=3) apresentavam alteração dos níveis de hemoglobina. Pode-se observar uma prevalência de insegurança alimentar de 71,2% e que ser mulher chefe de família aumenta as chances deinsegurança alimentar e nutricional entre os quilombolas do estado do Tocantins
Fe3O4-Au Core-Shell Nanoparticles as a Multimodal Platform for In Vivo Imaging and Focused Photothermal Therapy
In this study, we report the synthesis of gold-coated iron oxide nanoparticles capped
with polyvinylpyrrolidone (Fe@Au NPs). The as-synthesized nanoparticles (NPs) exhibited good
stability in aqueous media and excellent features as contrast agents (CA) for both magnetic resonance
imaging (MRI) and X-ray computed tomography (CT). Additionally, due to the presence of the
local surface plasmon resonances of gold, the NPs showed exploitable “light-to-heat” conversion
ability in the near-infrared (NIR) region, a key attribute for effective photothermal therapies (PTT).
In vitro experiments revealed biocompatibility as well as excellent efficiency in killing glioblastoma
cells via PTT. The in vivo nontoxicity of the NPs was demonstrated using zebrafish embryos as
an intermediate step between cells and rodent models. To warrant that an effective therapeutic
dose was achieved inside the tumor, both intratumoral and intravenous routes were screened in
rodent models by MRI and CT. The pharmacokinetics and biodistribution confirmed the multimodal
imaging CA capabilities of the Fe@AuNPs and revealed constraints of the intravenous route for
tumor targeting, dictating intratumoral administration for therapeutic applications. Finally, Fe@Au
NPs were successfully used for an in vivo proof of concept of imaging-guided focused PTT against
glioblastoma multiforme in a mouse model.Spanish Ministry of Economy, Industry and
Competitiveness (CTQ2017-86655-R and BIO2017-84246-C2-1-R)Fondo Social de la DGA (grupos
DGA) and by the Regional Ministry of Health of Andalusia (OH-0026-2018).Associate Laboratory for Green Chemistry—LAQVApplied Molecular Biosciences
Unit –UCIBIOPortuguese national funds from FCT/MCTES (UIDB/04378/2020
and UIDB/50006/2020
Consumo de pescado e nível de atividade física em grupo de adolescentes do ensino médio.
Atividade física tem se destacado por promover a aptidão física e o consumo do pescado por suas propriedades nutricionais, que propiciam diversos benefícios à saúde. Entretanto, a análise dessas variadas combinada não é frequente em crianças e adolescentes. A pesquisa teve como objetivo avaliar como se apresentam o estado nutricional e o nível de atividade física em grupo de maior e menor consumo de pescado em escolares
Longitudinal double spin asymmetries in single hadron quasi-real photoproduction at high
We measured the longitudinal double spin asymmetries for single
hadron muo-production off protons and deuterons at photon virtuality <
1(GeV/) for transverse hadron momenta in the range 0.7
GeV/ to 4 GeV/ . They were determined using COMPASS data taken
with a polarised muon beam of 160 GeV/ or 200 GeV/ impinging on
polarised or targets. The experimental
asymmetries are compared to next-to-leading order pQCD calculations, and are
sensitive to the gluon polarisation inside the nucleon in the range
of the nucleon momentum fraction carried by gluons
Interplay among transversity induced asymmetries in hadron leptoproduction
In the fragmentation of a transversely polarized quark several left-right
asymmetries are possible for the hadrons in the jet. When only one unpolarized
hadron is selected, it exhibits an azimuthal modulation known as Collins
effect. When a pair of oppositely charged hadrons is observed, three
asymmetries can be considered, a di-hadron asymmetry and two single hadron
asymmetries. In lepton deep inelastic scattering on transversely polarized
nucleons all these asymmetries are coupled with the transversity distribution.
From the high statistics COMPASS data on oppositely charged hadron-pair
production we have investigated for the first time the dependence of these
three asymmetries on the difference of the azimuthal angles of the two hadrons.
The similarity of transversity induced single and di-hadron asymmetries is
discussed. A new analysis of the data allows to establish quantitative
relationships among them, providing for the first time strong experimental
indication that the underlying fragmentation mechanisms are all driven by a
common physical process.Comment: 6 figure
Interplay among transversity induced asymmetries in hadron leptoproduction
In the fragmentation of a transversely polarized quark several left-right
asymmetries are possible for the hadrons in the jet. When only one unpolarized
hadron is selected, it exhibits an azimuthal modulation known as Collins
effect. When a pair of oppositely charged hadrons is observed, three
asymmetries can be considered, a di-hadron asymmetry and two single hadron
asymmetries. In lepton deep inelastic scattering on transversely polarized
nucleons all these asymmetries are coupled with the transversity distribution.
From the high statistics COMPASS data on oppositely charged hadron-pair
production we have investigated for the first time the dependence of these
three asymmetries on the difference of the azimuthal angles of the two hadrons.
The similarity of transversity induced single and di-hadron asymmetries is
discussed. A new analysis of the data allows to establish quantitative
relationships among them, providing for the first time strong experimental
indication that the underlying fragmentation mechanisms are all driven by a
common physical process.Comment: 6 figure
Leading-order determination of the gluon polarisation from semi-inclusive deep inelastic scattering data
Using a novel analysis technique, the gluon polarisation in the nucleon is
re-evaluated using the longitudinal double-spin asymmetry measured in the cross
section of semi-inclusive single-hadron muoproduction with photon virtuality
. The data were obtained by the COMPASS experiment at
CERN using a 160 GeV/ polarised muon beam impinging on a polarised LiD
target. By analysing the full range in hadron transverse momentum ,
the different -dependences of the underlying processes are separated
using a neural-network approach. In the absence of pQCD calculations at
next-to-leading order in the selected kinematic domain, the gluon polarisation
is evaluated at leading order in pQCD at a hard scale of . It is determined in three intervals
of the nucleon momentum fraction carried by gluons, , covering the
range ~ and does not exhibit a significant
dependence on . The average over the three intervals, at
, suggests that the gluon polarisation
is positive in the measured range.Comment: 14 pages, 6 figure
Resonance Production and S-wave in at 190 GeV/c
The COMPASS collaboration has collected the currently largest data set on
diffractively produced final states using a negative pion
beam of 190 GeV/c momentum impinging on a stationary proton target. This data
set allows for a systematic partial-wave analysis in 100 bins of three-pion
mass, GeV/c , and in 11 bins of the reduced
four-momentum transfer squared, (GeV/c) . This
two-dimensional analysis offers sensitivity to genuine one-step resonance
production, i.e. the production of a state followed by its decay, as well as to
more complex dynamical effects in nonresonant production. In this paper,
we present detailed studies on selected partial waves with , , , , and . In these waves, we observe
the well-known ground-state mesons as well as a new narrow axial-vector meson
decaying into . In addition, we present the results
of a novel method to extract the amplitude of the subsystem with
in various partial waves from the
data. Evidence is found for correlation of the and
appearing as intermediate isobars in the decay of the known
and .Comment: 96 page
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