Forage Quality Evaluation of Chopped Elephantgrass Hay through Intake and Digestibility Trial

The research was carried out to evaluate forage quality of chopped elephantgrass (Pennisetum purpureum Schum.) hay and to define a proper stage for cutting and haymaking of this grass. Chemical composition, voluntary intake, and apparent digestibility of the hays were studied at five different growth stages (30, 48, 63, 76, and 91 days). Twenty-five common wethers were utilized in a completely randomized experimental design. Dry matter (DM) voluntary intake was not different (P\u3e 0.05) from 30 to 63 days of regrowth and from 63 to 91 days and comprised 3.9; 3.5; 3.2; 2.1; and 2.4% of animal liveweight, respectively from 30 to 91 days. Digestibility coefficients of DM; OM; CP; EE; NDF; and ADF decreased linearly (P\u3c 0.001) as plant aged. At the experimental conditions haymaking of chopped elephantgrass showed good potential as a forage storage practice, particularly for low-input familial agricultural systems. According to DM yield, chemical composition, voluntary intake and apparent digestibility, the best grass cutting stage for haymaking occurred between 30 and 63 days

Perfil do consumidor e do consumo de produtos orgânicos no Rio Grande do Norte.

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Experimental proposal for measuring the Gouy phase of matter waves

The Schr\"odinger equation for an atomic beam predicts that it must have a phase anomaly near the beam waist analogous to the Gouy phase of an electromagnetic beam. We propose here a feasible experiment which allows for the direct determination of this anomalous phase using Ramsey interferometry with Rydberg atoms. Possible experimental limitations are discussed and shown to be completely under control within the present day technology. We also discuss how this finding can open the possibility to use the spatial mode wavefunctions of atoms as q-dits, since the Gouy phase is an essential ingredient for making rotations in the quantum states.Comment: 9 pages and 3 figure

Influência do fósforo e de diferentes regimes de corte sobre a digestibilidade in vitro do capim-de-raiz (Chloris orthonoton, Doell).

O presente trabalho objetivou avaliar a digestibilidade do capim-de-raiz submetido a diferentes doses de fósforo, frequências e intensidades de corte

Mapeamento de parâmetros biofísicos e da evapotranspiração no Pantanal usando técnicas de sensoriamento remoto.

Nos últimos anos, técnicas de sensoriamento remoto têm sido aplicadas extensivamente no monitoramento e mapeamento de diversos fenômenos meteorológicos e ambientais. Informações de sensores remotos têm alimentado diversos modelos e algoritmos para obtenção de parâmetros da superfície da terra. O SEBAL é um algoritmo que tem como vantagem a obtenção de parâmetros de superfície da terra com poucos dados observacionais de forma efetiva e econômica. Este trabalho objetivou mapear parâmetros biofísicos e a evapotranspiração real diária no Pantanal por meio do algoritmo SEBAL e imagem Modis/Terra. Os resultados preliminares aqui obtidos sugerem que, numa escala regional, o algoritmo SEBAL pode ser considerado como método de potencial aplicação na região do Pantanal em estudos diversos de processos biofísicos do sistema solo-planta-atmosfera com quantidade limitada de informações de superfície

Criação de variedades de citros mediante o desenvolvimento de linhagens homozigotas a partir da obtenção de haploides.

O melhoramento convencional em citros é tido como uma técnica lenta e cara, podendo levar de 25 a 30 anos para um lançamento de uma nova variedade. Visando agilizá-lo, existem diversas técnicas biotecnológicas, dentre elas a androgênese, que consiste na obtenção de haploides mediante a cultura in vitro de anteras

Ferromagnetic Levan Composite: An Affinity Matrix to Purify Lectin

A simple and inexpensive procedure used magnetite and levan to synthesize a composite recovered by a magnetic field. Lectins from Canavalia ensiformis (Con A) and Cratylia mollis (Cramoll 1 and Cramoll 1, 4) did bind specifically to composite. The magnetic property of derivative favored washing out contaminating proteins and recovery of pure lectins with glucose elution. Cramoll 1 was purified by this affinity binding procedure in two steps instead of a previous three-step protocol with ammonium sulfate fractionation, affinity chromatography on Sephadex G-75, and ion exchange chromatography through a CM-cellulose column

Changes recorded in cardiac graphoelements bees (Apis mellifera) during contact with fipronil.

A mortality of bees (Apis mellifera) caused by fipronil intoxication, due to its indiscriminate use in crops, has long been attracting the scientific community’s attention, either due to its acute or residual effects. In this study, we assessed the cardiac activity as a biomarker of fipronil intoxication through electrophysiological recordings of bees. Eighteen foragers, from the apiary of EMBRAPA—Eastern Amazon (Belém-Pará), bees were previously anesthetized at low temperature (− 10 °C) for 5 min and properly restrained and fixed on a stereotaxic base, where electrodes were implanted. All these procedures were carried out within a Faraday cage. Eighteen bees were used in the study. Worker bees engaged in foraging activities were selected. The bees were divided into a control group and a group treated with fipronil at 0.025 mg/bee (n = 9). The recordings lasted for 4 min and were evaluated at 1-s intervals represented by the following letters: A = (2–3 s), B = (59–60 s), C = (119–120 s), D = (179–180 s), and E = (239–240 s). The results showed that fipronil reduced the frequency and intensity of cardiac activity, exhibiting rapidly evolving effects, and promoting a disruption of homeostasis in bee hemodynamics. Through the obtained data, it was observed variation in spike amplitude, with a loss of cardiac strength and magnitude of the electrical impulse in the bee’s heart during exposure to fipronil