9,030 research outputs found
Desempenho e variação genética de progênies de Pinus taeda procedentes de áreas de produção de sementes da África do Sul.
Progresso genético para produtividade e peso de 100 grãos em 14 anos do Programa de Melhoramento de Arroz Irrigado de Minas Gerais.
O objetivo deste estudo foi estimar o progresso genético e ambiental da produtividade e peso de 100 grãos do programa de melhoramento de arroz irrigado do estado de Minas Gerais no período de 1998 a 2012
A new approach for the sequential injection spectrophotometric determination of the total antioxidant activity
A sequential injection system based on the ABTS (2,2'-azino-bis-(3-ethylbenzothiazoline-6-sulphonic-acid) methodology was developed.
The proposed method, incorporating a mixing chamber in the side port of the selection valve, was evaluated to measure the total antioxidant activity of several beverages and foods. The ABTS•+ is generated by oxidation of ABTS with potassium persulfate and is reduced in presence of hydrogen-donating antioxidants converting into a colourless product. The applicability of the developed method was tested by measurement of the antioxidant activity of pure
compounds as well as by analysing complex food and beverage samples. The antioxidant activity was presented as l(+) ascorbic acid equivalence. The values obtained by this methodology were not significantly different from the results obtained by the original spectrophotometric ABTS assay. For most of the studied antioxidants, antioxidant activity varied with pH and dilution. The proposed SIA system is suitable for screening direct or diluted total antioxidant activity of pure compounds or food samplesinfo:eu-repo/semantics/acceptedVersio
Hemangiopericytoma
A propósito de um caso clínico de hemangiopericitoma com localização no membro inferior esquerdo, os autores fazem uma breve revisão desta entidade patológica. Destacam-se as suas principais características clínicas e salienta-se o contributo da arteriografia, no diagnóstico, e tratamento coadjuvante da cirurgia
When did cosmic acceleration start? How fast was the transition?
Cosmic acceleration is investigated through a kink-like expression for the
deceleration parameter (q). The new parametrization depends on the initial
(q_i) and final (q_f) values of q, on the redshift of the transition from
deceleration to acceleration (z_{t}) and the width of such transition (\tau).
We show that although supernovae (SN) observations (Gold182 and SNLS data
samples) indicate, at high confidence, that a transition occurred in the past
(z_{t}>0) they do not, by themselves, impose strong constraints on the maximum
value of z_{t}. However, when we combine SN with the measurements of the ratio
between the comoving distance to the last scattering surface and the
SDSS+2dfGRS BAO distance scale (S_{k}/D_{v}) we obtain, at 95.4% confidence
level, z_{t}=0.84+{0.17}-{0.13} and \tau =0.51-{0.17}+{0.23} for
(S_{k}/D_{v}+Gold182), and z_{t}=0.88-{0.10}+{0.12} and \tau
=0.35-{0.10}+{0.12} for (S_{k}/D_{v} + SNLS), assuming q_i=0.5 and q_f=-1. We
also analyze the general case, q_f\in(-\infty,0) finding the constraints that
the combined tests (S_{k}/D_{v} + SNLS) impose on the present value of the
deceleration parameter (q_0).Comment: 7 pages, 3 figures. Replaced to match the published versio
Estimativas de parâmetros genéticos visando a seleção para resistência à queima-das-folhas em populações de cenoura do grupo Brasília.
bitstream/CNPH-2009/34418/1/bpd_36.pd
Formigas cortadeiras em sistemas de integração lavoura-pecuária-floresta - iLPF: fundamentos para o controle.
bitstream/item/95731/1/CT-331-Porfirio.pd
Evolução dos níveis de tolerância a queima das folhas em cultivares de cenoura.
Este trabalho teve como objetivo avaliar a evolução ds cultivares de cenoura da Embrapa Hortaliças quanto à tolerância à queima das folhas.bitstream/item/57212/1/BPD-75.pd
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