Efeito do tamanho do alvo e condições operacionais sobre a uniformidade de deposição de pulverizações em pré-emergência

Pós-graduação em Agronomia (Proteção de Plantas) - FCA

Métodos para estimar perdas em pulverizações de herbicidas em pré-emergência

Pós-graduação em Agronomia (Proteção de Plantas) - FCA

Efeito de pontas de pulverização e de arranjos populacionais de plantas de Eichhornia crassipes (Mart.) Solms., Salvinia auriculata Aubl. e Pistia stratiotes L. na deposição de calda de pulverização

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Efeito da eletrização de gotas sobre a variabilidade dos depósitos de pulverização e eficácia do glyphosate no controle de plantas daninhas da cultura da soja

Pós-graduação em Agronomia (Agricultura) - FCA

Estudo hidroquímico e dos isótopos de urânio nas águas subterrâneas em cidades do Estado do Amazonas (AM)

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Uranium-lead dating method at the Pará-Iso isotope geology laboratory, UFPA, Belém – Brazil

ABSTRACT: Analytical procedures for U-Pb isotope dilution analyses at the Pará-Iso isotope geology laboratory of the Federal University of Pará (UFPA) are described in detail. The procedures are applied to zircon, titanite, rutile, apatite, columbite-tantalite and whole rock. Reagent preparation and chemical processing are done in clean-room conditions. Samples are dissolved using Teflon™ microcapsules in steel jacket Teflon™ Parr Instrument™ bomb or Teflon™ screw cap containers. U and Pb are separated using anion exchange AG 1x8 resin columns. Typical blanks for mineral sample amounts of 0.01 to 1.0 mg are less than 1 pg U and 20-30 pg Pb. Isotope analysis of the U and Pb from the same filament are carried out using a Finnigan MAT 262 mass-spectrometer in static and dynamic modes. The current analytical level is demonstrated on analyses of international standard zircon 91500 with three different ²³⁵U-²⁰⁵Pb and ²³⁵U-²⁰⁸Pb isotope tracers and whole rock standards. Results of analyses of two zircon samples are also presented.

Determinação da velocidade e sentido do fluxo de águas subterrâneas utilizando radioisótopos pela técnica do poço único

Metodologia radioisotópica, através da técnica do poço único, foi empregada com o objetivo de determinar a velocidade e o sentido de deslocamento do fluxo de águas subterrâneas, utilizando traçadores radioativos, em poços piezométricos situados no campus da Universidade Federal do Pará (UFPA), em Belém-PA, às margens do Rio Guamá. Foi utilizado o iodo-131 como radiotraçador e a aquisição dos dados foi feita através de sistema espectrométrico, utilizando detectores de radiação. A aplicação dessa técnica na determinação conjunta da velocidade e sentido do fluxo, embora não seja usual, permitiu concluir que se trata de uma alternativa promissora que pode ser aplicada rotineiramente, proporcionando clareza e segurança nos resultados.

Instrumento e método para adquirir sinais e imagens do trato gastrintestinal

This invention relates to an apparatus and method for improving detection by equipment used to detect magnetic susceptibility. The advantages provided are related to different factors, such as reduced instrumentation cost, performance in terms of stability and sensitivity, etc. The devices may be used, for example, to detect magnetic tracers and markers in the gastrointestinal tract of animals and humans. They can be used in research and/or for diagnostic purposes using information related to a variety of parameters of the gastrointestinal tract, such as, pharyngeal and oesophageal transit time, gastric emptying and motility, colonic motility, inter alia.

Utilização de magnetorresistores no desenvolvimento de novas técnicas para aplicações em gastroenterologia

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Origin and function of short-latency inputs to the neural substrates underlying the acoustic startle reflex

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Biosusceptometria de corrente alternada para avaliação do trânsito gastrintestinal de alimentos líquidos em ratos

The gastrointestinal tract is the main route of nutrients absorption and drugs delivery. Is important to know the parameters related to the tract, like gastric emptying and gastrointestinal transit, in order to better understand the behavior of different kind of meals or drugs passing through the GIT. Many techniques are used to study these parameters, such as manometry, scintigraphy, phenol red, activated charcoal and carbon-13 reading. However, these methods use radiation, are invasive and require animal sacrifice. As an alternative proposal, the Alternate Current Biosusceptometry (ACB), a magnetic technique, has proved to be effective for these studies with small animals, in a noninvasive way, low cost, radiation free and avoiding the animal death. Associating the ACB to magnetic micro or nanoparticles used as tracers, it is possible to observe the meal behavior inside of the GIT. Focusing meanly on liquid meals digestion, this paper had the objective to evaluate the efficiency of the ACB technique in gastric emptying and gastrointestinal transit evaluation of liquid meals in rats. To perform the experiments, magnetic nanoparticles (ferrite, MgFe2O4) were used on a 1,5 ml solution introduced by gavage on similar weight and age rats. The sensor made by 2 pairs of coils, capable of generating and detecting magnetic fields, creates a field on the interest place and when this field is in contact with the marked meal, it changes, resulting on a variation of the measured voltage. The voltage variation is analyzed and is obtained a particle concentration on the interest region. The results showed that is possible to apply the ACB technique on the GIT evaluation of liquid particles digestion, gastric emptying and meal cecum arrival time curves were obtained and from that, is possible to observe a pattern of gastrointestinal transit. Both mean process time values were acquired, proving the technique capability of ...

The noradrenergic projection from the locus coeruleus to the cochlear root neurons in rats

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Enhancing the versatility of alternate current biosusceptometry (ACB) through the synthesis of a dextrose-modified tracer and a magnetic muco-adhesive cellulose gel

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Redistribution of B-10 absorbed by leaves and roots of cashew seedlings

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Chemical weathering rate, denudation rate, and atmospheric and soil CO2 consumption of Parana flood basalts in Sao Paulo State, Brazil

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)