5,889 research outputs found
and distribution amplitudes from Bethe-Salpeter wave functions
We report on the first calculation of the longitudinal and transverse light
front distribution amplitudes of the and mesons and their first
four moments. As a byproduct, we also obtain these distribution amplitudes for
the , , and mesons and confirm a prediction of
lattice QCD for the vector kaon: while the longitudinal distribution amplitude
is almost symmetric, the transverse one is oblique implying that the strange
quark carries more momentum.Comment: 7 pages, 4 figures, 3 table
A mela da soja no Estado do Pará nas safras de 2003 a 2005.
bitstream/item/18796/1/com.tec.152.pdfNa publicação: Ruth Linda Benchimo
Núcleo de Apoio à Pesquisa e Transferência de Tecnologia da Belém-Brasília.
bitstream/item/146740/1/Agrofocop22.pd
Peroxisomal APX knockdown triggers antioxidant mechanisms favourable for coping with high photorespiratory H2O2 induced by CAT deficiency in rice
The physiological role of peroxisomal ascorbate
peroxidases (pAPX) is unknown; therefore, we utilized pAPX4 knockdown rice and
catalase (CAT) inhibition to assess its role in CAT compensation under high
photorespiration. pAPX4 knockdown induced co-suppression in the expression of pAPX3.
The rice mutants exhibited metabolic changes such as lower CAT and glycolate
oxidase (GO) activities and reduced glyoxylate content; however, APX activity
was not altered. CAT inhibition triggered different changes in the expression
of CAT, APX and glutathione peroxidase (GPX) isoforms between non-transformed
(NT) and silenced plants. These responses were associated with alterations in
APX, GPX and GO activities, suggesting redox homeostasis differences. The
glutathione oxidation-reduction states were modulated differently in mutants,
and the ascorbate redox state was greatly affected in both genotypes. The pAPX
suffered less oxidative stress and photosystem II (PSII) damage and displayed
higher photosynthesis than the NT plants. The improved acclimation exhibited by
the pAPX plants was indicated by lower H2O2 accumulation, which was associated with
lower GO activity and glyoxylate content. The suppression of both pAPXs and/or
its downstream metabolic and molecular effects may trigger favourable
antioxidant and compensatory mechanisms to cope with CAT deficiency. This physiological
acclimation may involve signalling by peroxisomal H2O2, which minimized the
photorespiration.</p
Recomendação de cultivares de soja para a microrregião de Paragominas, Pará.
bitstream/item/28206/1/ComTec82.pd
The influence of synthetic hyetograph parameters on simulation results of runoff from urban catchment
The paper presents the results of analysis of the influence of the maximum intensity (peak) location in the synthetic hyetograph and rainfall duration on the maximum outflow from urban catchment. For the calculation Chicago hyetographs with a duration from 15 minutes to 180 minutes and peak location between 20% and 50% of the total rainfall duration were design. Runoff simulation was performed using the SWMM5 program for three models of urban catchment with area from 0.9 km2 to 6.7 km2. It was found that the increase in the rainfall peak location causes the increase in the maximum outflow up to 17%. For a given catchment the greatest maximum outflow is generated by the rainfall, which time to peak corresponds to the flow time through the catchment. Presented results may be useful for choosing the rainfall parameters for storm sewer systems modeling
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