1,104 research outputs found
Yield Of Beet Cultivars Under Fertigation Management And Salinity Control In A Protected Environment
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)In a protected environment, applying excess fertilizer and using water with soluble salts cause soil salinization due to the absence of lixiviation by precipitation. Among commercial vegetables, beets (Beta vulgaris L.) have good tolerance to soil salinity, being a good option for growth under these conditions. An experimental study was carried out in the municipality of Botucatu, São Paulo, Brazil. The treatment consisted of a combination of the following factors: initial soil salinity (1, 3, 6, 9, and 12 dS m-1), fertigation management (traditional vs. control of ion concentration of the soil solution) and two beet cultivars (‘Early Wonder’ and ‘Itapuã’) in a 5 × 2 × 2 factorial design. A randomized block design with four replicates was adopted, totaling 80 experimental plots. The total fresh weight of aerial part and root, total dry weight of aerial part and root, and water use efficiency (WUE) were assessed. Significant differences were found between fertigation management practices and salinity levels proposed. ‘Itapuã’ showed better yield and WUE for electrical conductivity (EC) below 6 dS m-1. Under traditional fertigation, root yield response fits a linear model with a decrease of 11.365 g (‘Early Wonder’) and 11.025 g (‘Itapuã’) for each unit increase in EC. Under controlled fertigation, the best-fit model was quadratic, with maximum estimates of 248.83 g for ‘Early Wonder’ and 258.52 g for ‘Itapuã’. Controlling EC of the soil solution had a positive effect, while salinity levels above 6 dS m-1 must be avoided. © 2016, Instituto de Investigaciones Agropecuarias, INIA. All rights reserved.764463470CAPES, Coordenação de Aperfeiçoamento de Pessoal de Nível SuperiorCNPq, Conselho Nacional de Desenvolvimento Científico e TecnológicoCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq
FATP4 missense and nonsense mutations cause similar features in Ichthyosis Prematurity Syndrome
<p>Abstract</p> <p>Background</p> <p>Ichthyosis Prematurity Syndrome (IPS) is an autosomal recessive disorder characterized by premature birth, non-scaly ichthyosis and atopic manifestations. The disease was recently shown to be caused by mutations in the gene encoding the fatty acid transport protein 4 (FATP4) and a specific reduction in the incorporation of very long chain fatty acids (VLCFA) into cellular lipids.</p> <p>Findings</p> <p>We screened probands from five families segregating IPS for mutations in the <it>FATP4 </it>gene. Four probands were compound heterozygous for four different mutations of which three are novel. Four patients were heterozygous and one patient homozygous for the previously reported non-sense mutation p.C168X (c.504c > a). All patients had clinical characteristics of IPS and a similar clinical course.</p> <p>Conclusions</p> <p>Missense mutations and non-sense mutations in <it>FATP4 </it>are associated with similar clinical features suggesting that missense mutations have a severe impact on FATP4 function. The results broaden the mutational spectrum in <it>FATP4 </it>associated with IPS for molecular diagnosis of and further functional analysis of FATP4.</p
Efeito do manejo da irrigação sob diferentes métodos controle e tensões de água do solo na cultura do feijoeiro.
O trabalho objetivou estudar o efeito do manejo da irrigação sob três métodos de controle de irrigação e três diferentes tensões de água do solo na cultura do feijoeiro (Phaseolus vulgaris L.)
Numerical Investigation of a Mesoscopic Vehicular Traffic Flow Model Based on a Stochastic Acceleration Process
In this paper a spatial homogeneous vehicular traffic flow model based on a
stochastic master equation of Boltzmann type in the acceleration variable is
solved numerically for a special driver interaction model. The solution is done
by a modified direct simulation Monte Carlo method (DSMC) well known in non
equilibrium gas kinetic. The velocity and acceleration distribution functions
in stochastic equilibrium, mean velocity, traffic density, ACN, velocity
scattering and correlations between some of these variables and their car
density dependences are discussed.Comment: 23 pages, 10 figure
The normalized quadrature method of moments coupled with finite pointset method
This work reports the numerical performance of the Normalized Quadrature Method of Moments (NQMOM) involving more than one quadrature node (secondary particle) for dispersed phase flows coupled with the Finite Pointset Method (FPM). At first, the model used for the dispersed phase acting in a continuous environment is discussed briefly, followed by a theoretical discussion of NQMOM and FPM. Further sections report the numerical performance for test problems with increasing difficulty
The normalized quadrature method of moments coupled with finite pointset method
This work reports the numerical performance of the Normalized Quadrature Method of Moments (NQMOM) involving more than one quadrature node (secondary particle) for dispersed phase flows coupled with the Finite Pointset Method (FPM). At first, the model used for the dispersed phase acting in a continuous environment is discussed briefly, followed by a theoretical discussion of NQMOM and FPM. Further sections report the numerical performance for test problems with increasing difficulty
Post-Collision Interaction with Wannier electrons
A theory of the Post-Collision Interaction (PCI) is developed for the case
when an electron atom impact results in creation of two low-energy Wannier
electrons and an ion excited into an autoionizing state. The following
autoionization decay exposes the Wannier pair to the influence of PCI resulting
in variation of the shape of the line in the autoionization spectrum. An
explicit dependence of the autoionization profile on the wave function of the
Wannier pair is found. PCI provides an opportunity to study this wave function
for a wide area of distancesComment: 33 pages, Latex, IOP style, and 3 figures fig1.ps, fig2.ps, fig3.p
Electron attachment to SF6 and lifetimes of SF6- negative ions
We study the process of low-energy electron capture by the SF6 molecule. Our
approach is based on the model of Gauyacq and Herzenberg [J. Phys. B 17, 1155
(1984)] in which the electron motion is coupled to the fully symmetric
vibrational mode through a weakly bound or virtual s state. By tuning the two
free parameters of the model, we achieve an accurate description of the
measured electron attachment cross section and good agreement with vibrational
excitation cross sections of the fully symmetric mode. An extension of the
model provides a limit on the characteristic time of intramolecular vibrational
relaxation in highly-excited SF6-. By evaluating the total vibrational spectrum
density of SF6-, we estimate the widths of the vibrational Feshbach resonances
of the long-lived negative ion. We also analyse the possible distribution of
the widths and its effect on the lifetime measurements, and investigate
nonexponential decay features in metastable SF6-.Comment: 22 pages, 10 figures, submitted to Phys. Rev.
Evolução da salinidade do solo por aplicação de fertilizantes em cultivo de beterraba fertirrigado.
A salinização dos solos pode ter origem natural ou ser induzida pelo homem, sendo a segunda maneira geralmente associada ao manejo inadequado da irrigação ou fertirrigação. O objetivo desse estudo foi verificar a evolução da salinidade provocada pela fertirrigação em um cultivo de beterraba. Um experimento foi realizado na FCA UNESP campus de Botucatu, em vasos de 15L, para a obtenção de curvas de salinização artificial do solo. O solo foi salinizado artificialmente pela fertirrigação excessiva. Os tratamentos foram formados da combinação de dois fatores: salinidade inicial do solo com 5 níveis (S1=1,0; S3=3,0;S6 =6,0; S9=9,0; S12=12,0 dS m-1) e dois manejos de fertirrigação (M1= tradicional e M2 = com controle da concentração iônica da solução do solo). O delineamento adotado foi o de blocos casualizados, com 4 repetições, e os fatores arranjados em esquema fatorial 5 x 2. A obtenção da condutividade elétrica do solo com a correção da umidade do solo proporcionou valores com maiores precisões para a manutenção da salinidade na solução do solo. Os maiores níveis da salinidade do solo ocorreram nas camadas mais profundas do perfil do solo no manejo tradicional da fertirrigação, devido aos altos valores de condutividade elétrica observados neste tratamento
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