Efeito da data de semeadura para duas cultivares contrastantes de feijão.

Nesse estudo, utilizou-se duas cultivares, a Radiante que apresenta ciclo curto e a Pérola, de ciclo médio, com o objetivo de avaliar a produtividade e seus componentes em quatro diferentes datas de plantio (15/06/2011; 29/06/2011; 13/07/2011 e 28/07/2011)

Spatial variability in the productivity of maize intercropped with Tachi (Sclerolobium paniculatum) in the Amapá savanna - Brazilian Amazon.

Crop-livestock-forest systems can enable Brazilian agriculture, increasing the profit of the farmer and rancher, in addition to providing nutrients for plants, improve soil fertility, stimulates crop rotation, decrease the incidence of pests and diseases and increases jobs. In the northern region, stands out the need of search for rational exploitation of wood, being the recent research with intercroppedagriculture-forest recently evaluated an alternative system of grain production

Litter deposition in integrated agricultural systems in the Brazilian Cerrado.

In agro-ecosystems, litter is a major component, comprising material that is deposited in the soil by fauna and flora. Integrated crop-livestock systems (ICL) and crop-livestock-forest systems (ICLF) are expected to enhance the use of plant biological cycle. Therefore, this study aimed to characterize litter deposition in integrated systems at the Brazilian Savannah, the Cerrado in Mato Grosso do Sul State, Brazil

Macrophage migration inhibitory factor downregulation: a novel mechanism of resistance to anti-angiogenic therapy.

Anti-angiogenic therapies for cancer such as VEGF neutralizing antibody bevacizumab have limited durability. While mechanisms of resistance remain undefined, it is likely that acquired resistance to anti-angiogenic therapy will involve alterations of the tumor microenvironment. We confirmed increased tumor-associated macrophages in bevacizumab-resistant glioblastoma patient specimens and two novel glioblastoma xenograft models of bevacizumab resistance. Microarray analysis suggested downregulated macrophage migration inhibitory factor (MIF) to be the most pertinent mediator of increased macrophages. Bevacizumab-resistant patient glioblastomas and both novel xenograft models of resistance had less MIF than bevacizumab-naive tumors, and harbored more M2/protumoral macrophages that specifically localized to the tumor edge. Xenografts expressing MIF-shRNA grew more rapidly with greater angiogenesis and had macrophages localizing to the tumor edge which were more prevalent and proliferative, and displayed M2 polarization, whereas bevacizumab-resistant xenografts transduced to upregulate MIF exhibited the opposite changes. Bone marrow-derived macrophage were polarized to an M2 phenotype in the presence of condition-media derived from bevacizumab-resistant xenograft-derived cells, while recombinant MIF drove M1 polarization. Media from macrophages exposed to bevacizumab-resistant tumor cell conditioned media increased glioma cell proliferation compared with media from macrophages exposed to bevacizumab-responsive tumor cell media, suggesting that macrophage polarization in bevacizumab-resistant xenografts is the source of their aggressive biology and results from a secreted factor. Two mechanisms of bevacizumab-induced MIF reduction were identified: (1) bevacizumab bound MIF and blocked MIF-induced M1 polarization of macrophages; and (2) VEGF increased glioma MIF production in a VEGFR2-dependent manner, suggesting that bevacizumab-induced VEGF depletion would downregulate MIF. Site-directed biopsies revealed enriched MIF and VEGF at the enhancing edge in bevacizumab-naive patients. This MIF enrichment was lost in bevacizumab-resistant glioblastomas, driving a tumor edge M1-to-M2 transition. Thus, bevacizumab resistance is driven by reduced MIF at the tumor edge causing proliferative expansion of M2 macrophages, which in turn promotes tumor growth

Produção de biomassa e características fisiológicas do feijoeiro cv. Pérola na safra de inverno.

O objetivo deste trabalho foi avaliar os índices fisiológicos de plantas de feijão cv. Pérola semeadas em diferentes datas, na safra de inverno

Order and nFl Behavior in UCu4Pd

We have studied the role of disorder in the non-Fermi liquid system UCu4Pd using annealing as a control parameter. Measurement of the lattice parameter indicates that this procedure increases the crystallographic order by rearranging the Pd atoms from the 16e to the 4c sites. We find that the low temperature properties depend strongly on annealing. Whereas the non-Fermi liquid behavior in the specific heat can be observed over a larger temperature range after annealing, the clear non-Fermi liquid behavior of the resistivity of the unannealed sample below 10 K disappears. We come to the conclusion that this argues against the Kondo disorder model as an explanation for the non-Fermi liquid properties of both as-prepared and annealed UCu4Pd

Meyer: híbrido de citros com propriedades de limoeiro e morfologia de laranjeira.

bitstream/item/53715/1/MEYER-HIBRIDO-DE-CITROS.pdfCNPQ; FEPAGRO

Flame: pomelo de polpa bem vermelha e sem sementes.

bitstream/item/53714/1/FLAME-POMELO-DE-POLPA.pdfCNPQ, FEPAGRO

Electronic structure of triangular, hexagonal and round graphene flakes near the Fermi level

The electronic shell structure of triangular, hexagonal and round graphene quantum dots (flakes) near the Fermi level has been studied using a tight-binding method. The results show that close to the Fermi level the shell structure of a triangular flake is that of free massless particles, and that triangles with an armchair edge show an additional sequence of levels ("ghost states"). These levels result from the graphene band structure and the plane wave solution of the wave equation, and they are absent for triangles with an zigzag edge. All zigzag triangles exhibit a prominent edge state at the Fermi level, and few low-energy conduction electron states occur both in triangular and hexagonal flakes due to symmetry reasons. Armchair triangles can be used as building blocks for other types of flakes that support the ghost states. Edge roughness has only a small effect on the level structure of the triangular flakes, but the effect is considerably enhanced in the other types of flakes. In round flakes, the states near the Fermi level depend strongly on the flake radius, and they are always localized on the zigzag parts of the edge

Diversity of epigeous soil macrofauna in spring and summer in two cultivated pasture systems and in the Brazilian Cerrado.

The different management practices used in agricultural systems can directly and indirectly interfere in soil fauna diversity, being an important indicator of biological quality of the environment. A trial was established to evaluate epigeous soil macrofauna diversity in different environments and seasons