Disponibilidade de cobre na rotação soja-trigo em sistema de plantio direto.

A matéria orgânica (MO) é um quelante natural com capacidade de diminuir a disponibilidade de cobre (Cu) para as plantas, principalmente, quando cultivadas em sistema de plantio direto (SPD). O objetivo deste trabalho foi avaliar os efeitos de doses de Cu sobre a produção e fertilidade do solo na rotação trigo (Triticum aestivum) e soja (Glycine max) em SPD. O delineamento experimental foi o blocos casualizados em parcelas subdividida com quatro repetições. As parcelas consistiram na aplicação de cinco doses de Cu (0, 1, 2, 4 e 8 kg ha-1) em cobertura e a subparcelas os períodos de cultivo. As doses de Cu influenciaram a produção de grãos de trigo e soja. Em solo com alto teor de MO, os extratores DTPA-TEA e Mehlich 1 apresentaram correlação significativa na determinação do Cu disponível, sendo que o DTPA-TEA teve o melhor ajuste (R2) em função das doses de Cu aplicada

Yield genetic gain at national level of carioca common beans from the Embrapa Breeding Program - 1993 to 2008.

The objective of this work was to estimate the genetic gain of the commercial type carioca dry beans breeding program carried out by Embrapa Rice and Beans Research Center in a period of 16 years, from 1993 to 2008

Atributos biológicos do solo numa cronossequência de pastagens em sistema ILP no Cerrado.

Neste estudo, objetivou-se avaliar as alterações exercidas pela dinâmica de rotação de culturas anuais e pastagem sobre o componente biológico do solo, com ênfase na cronossequência da fase pastagem, dentro do sistema de integração lavoura-pecuária.bitstream/item/35587/1/comt-198.pd

Estabilidade de linhagens de feijoeiro comum de grão preto no ensaio intermediário/2005 da Embrapa Arroz e Feijão.

O objetivo foi avaliar a estabilidade e adaptabilidade de linhagens de grão preto no ensaio intermediário/2005 do programa de melhoramento genético do feijoeiro comum da Embrapa Arroz e Feijão e identificar as mais promissoras para ambientes favoráveis e desfavoráveis

Experimental evidence of intrabeam scattering in a free-electron laser driver

Abstract The effect of multiple small-angle Coulomb scattering, or intrabeam scattering (IBS) is routinely observed in electron storage rings over the typical damping time scale of milliseconds. So far, IBS has not been observed in single pass electron accelerators because charge density orders of magnitude higher than in storage rings would be needed. We show that such density is now available at high brightness electron linacs for free-electron lasers (FELs). We report measurements of the beam energy spread in the FERMI linac in the presence of the microbunching instability, which are consistent with a revisited IBS model for single pass systems. We also show that neglecting the hereby demonstrated effect of IBS in the parameter range typical of seeded VUV and soft x-ray FELs, results in too conservative a facility design, or failure to realise the accessible potential performance. As an example, an optimization of the FERMI parameters driven by an experimentally benchmarked model, opens the door to the extension of stable single spectral line emission to the water window (2.3–4.4 nm), with far-reaching implications for experiments in a variety of disciplines, ranging from physics and chemistry to biology and material sciences, and including nonlinear x-ray optics based on the four-wave-mixing approach.</jats:p

Prostate Cancer Treatment-Related Toxicity: Comparison between 3D-Conformal Radiation Therapy (3D-CRT) and Volumetric Modulated Arc Therapy (VMAT) Techniques

Objective: This paper illustrates the results of a mono-institutional registry trial, aimed to test whether gastrointestinal (GI) and genitourinary (GU) toxicity rates were lower in localized prostate cancer patients treated with image-guided volumetric modulated arc therapy (IG-VMAT) compared to those treated with IG-3D conformal radiation therapy (IG-3DCRT). Materials and Methods: Histologically proven prostate cancer patients with organ-confined disease, treated between October 2008 and September 2014 with moderately hypofractionated radiotherapy, were reviewed. Fiducial markers were placed in the prostate gland by transrectal ultrasound guide. The prescribed total dose was 70 Gy in 28 fractions. The mean and median dose volume constraints for bladder and rectum as well as total volume of treatment were analyzed as potentially prognostic factors influencing toxicity. The Kaplan–Meier method was applied to calculate survival. Results: Overall, 83 consecutive patients were included. Forty-two (50.6%) patients were treated with 3D-CRT and 41 (49.4%) with the VMAT technique. The median follow-up for toxicity was 77.26 months for the whole cohort. The VMAT allowed for a dose reduction to the rectum and bladder for the large majority of the considered parameters; nonetheless, the only parameter correlated with a clinical outcome was a rectal dose limit V66 > 8.5% for late GI toxicity G ≥ 2 (p = 0.045). Rates of G ≥ 2 toxicities were low among the whole cohort of these patients treated with IGRT. The analysis for rectum dose volume histograms (DVHs) showed that a severe (grade ≥ 2) late GI toxicity was related with the rectal dose limit V66 > 8.5% (p = 0.045). Conclusions: This study shows that moderate hypofractionation is feasible and safe in patients with intermediate and high-risk prostate cancer. Daily IGRT may decrease acute and late toxicity to organs at risk and improve clinical benefit and disease control rate, cutting down the risk of PTV geographical missing. The adoption of VMAT allows for promising results in terms of OAR sparing and a reduction in toxicity that, also given the small sample, did not reach statistical significance

Estabilidade de linhagens de feijoeiro comum de grão carioca no ensaio intermediário/2005 da Embrapa Arroz e Feijão.

O objetivo foi avaliar a estabilidade e adaptabilidade de linhagens de grão carioca no ensaio intermediário/2005 do programa de melhoramento genético do feijoeiro comum da Embrapa Arroz e Feijão e identificar as mais promissoras para ambientes favoráveis e desfavoráveis

BRS Cometa: a carioca common bean cultivar with erect growth habit.

BRS Cometa was developed by Embrapa Rice and Beans and registered by the Ministério da Agricultura, Pecuária e Abastecimento (MAPA) for the states of Santa Catarina, São Paulo, Tocantins, Goiás and the Federal District of Brazil in view of its erect growth habit, earliness, good lodging resistance and resistance to Colletotrichum lindemuthianum and to bean common mosaic virus