Excessive N and water use in agriculture causes environmental degradation and can potentially jeopardize the sustainability of the system. A field study was conducted from 2000 to 2002 to study the effects of four N treatments (0, 100, 200, and 300 kg N ha(-1) per crop) on a wheat (Triticum aestivum L.) and maize (Zea mays L.) double cropping system under 70 +/- 15% field capacity in the North ...

[1] We describe a method that retrieves surface photosynthetically active radiation (PAR) and its direct and diffuse components from the Surface and Atmospheric Radiation Budget (SARB) product of Clouds and the Earth’s Radiant Energy System (CERES). The shortwave spectrum in the SARB Edition 2 is calculated in 15 bands, 4 of which are used to develop the PAR, in conjunction with the look-up tab...

The radiation budget at the top of the atmosphere (TOA) is a quantity of fundamental importance to the Atmospheric Radiation Measurement (ARM) Program. Thus, it is necessary to measure the radiation budget components, broadband shortwave (SW) albedo and outgoing longwave radiation, as accurately as possible. Measurement of TOA broadband albedos over the ARM surface sites has only been possible ...

The nucleotide sequences of the 10 genomic segments of an Italian isolate of maize rough dwarf virus (MRDV) were determined. This first complete genomic sequence of MRDV will help understand the phylogenetic relationships among group 2 fijiviruses and especially the closely related rice black-streaked dwarf virus, which is also found to naturally infect maize.

"Single" T = 1 isometric particles of Maize streak virus (MSV) have been isolated from infected maize leaves. Biochemical and genetic characterizations show that these particles contain subgenomic (sg) MSV DNA encapsidated by the MSV coat protein. The largest sg DNA is 1.56 kb, slightly larger than half genome size, although sg DNAs as small as 0.2 kb were also cloned. The sg DNAs are not infec...

Historiador e professor de História. Atualmente é Professor do Departamento História CERES, da Universidade Federal Rio Grande Norte, lecionando no Campus Caicó. Atua como Permanente Programa Pós-Graduação em CERES-UFRN/Mestrado dos Sertões Colaborador PósGraduação CCHLAUFRN/Mestrado Espaços. É participante Rede Grupos Pesquisa Escravidão Mestiçagens. Seus interesses pesquisa estão ligados à Se...

The Dwarf Planet Ceres revealed the presence of ammonia and other unique properties compared to asteroids in main belt which suggests that it was not formed situ. We model early dynamical evolution outer Solar System study possible mechanisms implant a Ceres-sized planetesimal asteroid from trans-Saturnian region. calculate fraction population planetesimals are captured is range 2.8e-5 1.2e-3 d...

Low-albedo asteroids preserve a record of the primordial solar system planetesimals and conditions in which nebula was active. However, origin evolution these are not well-constrained. Here we measured visible near-infrared (0.5 - 4.0 microns) spectra low-albedo mid-outer main belt. We show that numerous large (d > 100 km) dark (geometric albedo < 0.09) exterior to dwarf planet Ceres' orbit sha...

Maize streak virus (MSV), which causes maize streak disease (MSD), is one of the most serious biotic threats to African food security. Here, we use whole MSV genomes sampled over 30 years to estimate the dates of key evolutionary events in the 500 year association of MSV and maize. The substitution rates implied by our analyses agree closely with those estimated previously in controlled MSV evo...

The CERES/NA45 experiment measures low mass electron pair production in Pb-Au collisions at 158AGeV at the CERN SPS. In this paper, we present the electron pair enhancement in the mass range 0:2 < mee < 0:7 GeV/c 2 , it increases more than linear with charged multiplicity and is most pronounced at low pair pT < 0:5 GeV/c. Transverse mass and rapidity distributions for charged hadrons h + ? h ? ...