Produtividade de grãos do feijoeiro comum em função da aplicação de N via foliar.

O objetivo do trabalho foi de determinar o efeito de doses e épocas de aplicação de nitrogênio via foliar na produtividade de grãos de duas cultivares de feijoeiro comum.CONAF

Dynamic monitoring of the shelf life of Cobia (Rachycentron canadum): a study on the applicability of a smart photochromic indicator.

To ensure the marketing of fresh fish-based products, it is necessary to develop fast methods that assess its freshness in real time. This study therefore evaluated the applicability of a photochromic time?temperature indicator (TTI) to monitor the time and temperature history during the period of validity of the whole fish of the cobia specimen stored in ice. The TTI response was both visibly interpreted as well as adaptable to measurement using suitable equipment. The results showed that the smart indicator activated during 6 s of ultraviolet light showed a similar rate of deterioration of the analysed product visual response, proving to be a dynamic shelf life indicator that can assure consumers the ultimate quality point of the entire cobia easily, cheaply and accurately

Optical detection of the Pictor A jet and tidal tail : evidence against an IC/CMB jet

Date of Acceptance: 12/06/2015New images of the FR II radio galaxy Pictor A from the Hubble Space Telescope reveal a previously undiscovered tidal tail, as well as a number of jet knots coinciding with a known X-ray and radio jet. The tidal tail is approximately 5″ wide (3 kpc projected), starting 18″ (12 kpc) from the center of Pictor A, and extends more than 90″ (60 kpc). The knots are part of a jet observed to be about 4′ (160 kpc) long, extending to a bright hotspot. These images are the first optical detections of this jet, and by extracting knot flux densities through three filters, we set constraints on emission models. While the radio and optical flux densities are usually explained by synchrotron emission, there are several emission mechanisms that might be used to explain the X-ray flux densities. Our data rule out Doppler-boosted inverse Compton scattering as a source of the high-energy emission. Instead, we find that the observed emission can be well described by synchrotron emission from electrons with a low-energy index (p ∼ 2) that dominates the radio band, while a high-energy index (p ∼ 3) is needed for the X-ray band and the transition occurs in the optical/infrared band. This model is consistent with a continuous electron injection scenario.Peer reviewedFinal Accepted Versio

Effect of scorpion toxin on the enterochromaffin-like cells in normal and Trypanosoma cruzi-infected rats: a morphological study

Intravenous injection of scorpion toxin (Tityus serrulatus) in normal and Trypanosoma cruzi infected rats did not cause ultrastructural morphologic changes on enterochromaffin-like (ECL) cells of the stomach, although it induced a significant increase of the gastric secretion. Our data seem to indicate that gastric ECL cells structure is not affected by stimulation with scorpion toxin or by acute infection with T. cruzi in the rat.A injeção intravenosa de toxina escorpiônica (Tityus serrulatus) em ratos normais e infectados pelo Trypanosoma cruzi não causou alterações morfológicas ultra-estruturáis das células enterocromaflns-like (ECL) do estómago, embora tenha induzido a aumento significativo da secreção do suco gástrico. Nossos resultados parecem indicar que a estrutura das células ECL do estómago de ratos não é afetada pela estimulação com a toxina escorpiônica ou pela infecção aguda pelo T. cruzi

Surface Brightness Profiles of Composite Images of Compact Galaxies at z~4-6 in the HUDF

The Hubble Ultra Deep Field (HUDF) contains a significant number of B, V and i'-band dropout objects, many of which were recently confirmed to be young star-forming galaxies at z~4-6. These galaxies are too faint individually to accurately measure their radial surface brightness profiles. Their average light profiles are potentially of great interest, since they may contain clues to the time since the onset of significant galaxy assembly. We separately co-add V, i' and z'-band HUDF images of sets of z~4,5 and 6 objects, pre-selected to have nearly identical compact sizes and the roundest shapes. From these stacked images, we are able to study the averaged radial structure of these objects at much higher signal-to-noise ratio than possible for an individual faint object. Here we explore the reliability and usefulness of a stacking technique of compact objects at z~4-6 in the HUDF. Our results are: (1) image stacking provides reliable and reproducible average surface brightness profiles; (2) the shape of the average surface brightness profiles show that even the faintest z~4-6 objects are resolved; and (3) if late-type galaxies dominate the population of galaxies at z~4-6, as previous HST studies have shown, then limits to dynamical age estimates for these galaxies from their profile shapes are comparable with the SED ages obtained from the broadband colors. We also present accurate measurements of the sky-background in the HUDF and its associated 1-sigma uncertainties.Comment: 10 pages, 9 figures, 2 tables, emulateapj; Accepted for publication in The Astronomical Journa

Mineração de dados para identificar atributos genéticos associados à características de interesse econômico à pecuária.

Pesquisadores da área de melhoramento genético possuem cada vez mais acesso a dados genéticos e genômicos e demandam por um método ou ferramenta robusta que atendam às suas necessidades na descoberta de conhecimento

Doses e épocas de aplicação foliar de N afetando a produtividade de grãos do feijoeiro comum.

A aplicação foliar do nitrogênio na cultura do feijoeiro comum vem se tornando prática comum dentre os produtores rurais mais tecnificados. Por sua vez, a aplicação nem sempre conduz a um diferencial de produtividade de grãos para a cultura. Assim, o objetivo do trabalho foi determinar o efeito de doses e épocas de aplicação de nitrogênio via foliar na produtividade de grãos de duas cultivares de feijoeiro comum. O experimento de campo foi conduzido na safra agrícola 2013 no município de Santo Antônio de Goiás, GO, em solo sob Cerrado no período de inverno (maio-agosto). O delineamento experimental foi em blocos ao acaso no esquema fatorial 5 x 4 x 2; fator A: dose de N, fator B: estádio de desenvolvimento da cultura quando se aplicou o N, e fator C: cultivar, com quatro repetições. Os tratamentos constaram da combinação de cinco doses de nitrogênio (0; 0,4; 0,8; 0,12 e 0,16 kg de ureia ha-1) aplicados via foliar com quatro estádios de desenvolvimento fenológico da cultura (R5, R6, R7 e R8). As cultivares estudadas foram a BRS Ametista e BRS Notável. A aplicação de doses crescentes de nitrogênio aplicados via foliar e a época dessa aplicação não afetaram os componentes de produção, produtividade de grãos e teores de nutrientes nos grãos das cultivares de feijoeiro comum BRS Ametista e BRS Notável