Nitrogen applied in okra under non-tightness grown and residual fertilization.

The aim of this study was to evaluate, in the Amazonian rainy season, the effect of nitrogen applied in okra under non-tightness grown and residual fertilization

Eficiência relativa de fontes de silício no controle de brusone nas folhas em arroz.

A adubação silicatada constitui uma das alternativas para diminuir o uso de fungicidas no controle da brusone em arroz. Foi realizado um experimento, durante 1999/2000 e repetido durante 2000/2001, com o objetivo de estudar a eficiência relativa de fontes de silício (Si) na redução da severidade da brusone nas folhas da cultivar Metica-1, em área de várzea

Índices agronômicos na cebolinha com doses de sulfato de amônio.

Este trabalho objetivou estudar índices agronômicos na cebolinha, com doses de sulfato de amônio (SA) em cobertura, em um Argissolo Amarelo, textura média.Edição dos Resumos do 52º Congresso Brasileiro de Olericultura, Salvador, jul. 2012

Crescimento e produção em quiabeiro com doses de nitrogênio.

O crescimento e a produção do quiabeiro são afetados pela deficiência de N. Objetivou-se avaliar, no período chuvoso amazônico, em Argissolo Amarelo distrófico textura média, o efeito de doses de uréia em cobertura sobre atributos do crescimento e de produção da cv. híbrida Dardo, incluindo-se a cv. não-híbrida Santa Cruz-47 e o esterco de galinha como fatores adicionais. O ensaio foi conduzido na Embrapa Amazônia Ocidental, Iranduba-AM, de outubro/2010 a fevereiro/2011

Crystal structure of liganded and unliganded forms of bovine plasma retinol-binding protein.

The three-dimensional structures of bovine plasma retinol-binding protein (bRBP) complexed with retinol (space group P2(1)2(1)2(1), a = 46.08, b = 49.12, c = 76.10 A) and of the unliganded protein prepared in vitro by extracting retinol with ethyl ether (space group P2(1)2(1)2(1), a = 46.55, b = 48.97, c = 76.87 A) have been solved at 1.9 and 1.7 A resolution, respectively. The final crystallographic R factors are 0.190 for holobRBP and 0.196 for the unliganded bRBP. The model for the bovine holoprotein is quite similar to that of the human protein, with which it exhibits 92% sequence similarity. The root mean square deviation between the alpha-carbons in the two proteins is 0.31 A. The retinol binding site is almost completely preserved. The loops that surround the opening of the beta-barrel are also particularly conserved, in contrast with the presence of several substitutions in parts of the RBP molecule opposite the opening of the calyx that binds retinol. Despite the fact that unliganded bovine RBP was prepared and crystallized using procedures completely different from those used to obtain the unliganded human RBP, the conformational differences between unliganded and liganded forms of bRBP are almost identical to those found previously between the same forms of human RBP. They mainly involve a few residues in the region extending from amino acid residues 32 to 37. Therefore, similar differences are very likely to exist between holoRBP and the physiologically occurring apoprotein. A not yet identified electron density, different in shape and orientation from retinol, also occupies the central cavity of the beta-barrel in the unliganded bRBP, as found for unliganded human RBP. The functional consequences of the conformational change induced by the removal of retinol on the interaction between RBP and transthyretin, coupled with the conservation of the entrance loops of the beta-barrel in mammalian RBPs, are consistent with their participation in molecular interactions

Altura e suprimento de nitrogênio afetando a Plutella xylostella na couve-de-folhas sob cobertura plástica.

O objetivo desse trabalho foi estudar a influência da altura e do forneciento de N sobre o ataque dessa traça em plantas de couve (cv. hi-crop) cultivadas em vasos, dentro de cultivo dessa brassicácea sob cobertura plástica.Edição dos Resumos do 52º Congresso Brasileiro de Olericultura, Salvador, jul. 2012

CMOS-3D smart imager architectures for feature detection

This paper reports a multi-layered smart image sensor architecture for feature extraction based on detection of interest points. The architecture is conceived for 3-D integrated circuit technologies consisting of two layers (tiers) plus memory. The top tier includes sensing and processing circuitry aimed to perform Gaussian filtering and generate Gaussian pyramids in fully concurrent way. The circuitry in this tier operates in mixed-signal domain. It embeds in-pixel correlated double sampling, a switched-capacitor network for Gaussian pyramid generation, analog memories and a comparator for in-pixel analog-to-digital conversion. This tier can be further split into two for improved resolution; one containing the sensors and another containing a capacitor per sensor plus the mixed-signal processing circuitry. Regarding the bottom tier, it embeds digital circuitry entitled for the calculation of Harris, Hessian, and difference-of-Gaussian detectors. The overall system can hence be configured by the user to detect interest points by using the algorithm out of these three better suited to practical applications. The paper describes the different kind of algorithms featured and the circuitry employed at top and bottom tiers. The Gaussian pyramid is implemented with a switched-capacitor network in less than 50 μs, outperforming more conventional solutions.Xunta de Galicia 10PXIB206037PRMinisterio de Ciencia e Innovación TEC2009-12686, IPT-2011-1625-430000Office of Naval Research N00014111031

A vision-based monitoring system for very early automatic detection of forest fires

Trabajo presentado a la "I International Conference on Modelling, Monitoring and Management of Forest Fires" celebrada en Toledo del 17 al 19 de Septiembre de 2008.International Conference on Modelling, Monitoring and Management of Forest Fires I This paper describes a system capable of detecting smoke at the very beginning of a forest fire with a precise spatial resolution. The system is based on a wireless vision sensor network. Each sensor monitors a small area of vegetation by running on-site a tailored vision algorithm to detect the presence of smoke. This algorithm examines chromaticity changes and spatio-temporal patterns in the scene that are characteristic of the smoke dynamics at early stages of propagation. Processing takes place at the sensor nodes and, if that is the case, an alarm signal is transmitted through the network along with a reference to the location of the triggered zone - without requiring complex GIS systems. This method improves the spatial resolution on the surveilled area and reduces the rate of false alarms. An energy efficient implementation of the sensor/processor devices is crucial as it determines the autonomy of the network nodes. At this point, we have developed an ad hoc vision algorithm, adapted to the nature of the problem, to be integrated into a single-chip sensor/processor. As a first step to validate the feasibility of the system, we applied the algorithm to smoke sequences recorded with commercial cameras at real-world scenarios that simulate the working conditions of the network nodes. The results obtained point to a very high reliability and robustness in the detection process.This work is funded by Junta de Andalucía (CICE) through project 2006-TIC-2352.Peer Reviewe