Levantamento da podridão do estipe da pupunha no litoral do Paraná.

Organizado por Patricia Póvoa de Mattos, Celso Garcia Auer, Rejane Stumpf Sberze, Katia Regina Pichelli e Paulo César Botosso

Human dermal exposure to galaxolide from personal care products

Musks are synthetic fragrances applied on personal care and household products as fixatives, by retarding the release of other fragrances with higher volatility. Galaxolide is the most used polycyclic musk since the 90th decade, and it has been detected in several environmental and biological matrices, particularly in human tissues and fluids. For exposure assessment purposes, large-monitoring data need to be obtained and rapid but reliable analytical techniques are requested. The main objective of this study is to develop and validate a new and fast analytical methodology to quantify galaxolide in personal care products and to apply this method to real matrices like skin care products (creams and lotions), shower products (soap bar), hair care products (shampoo and hair conditioner) and oral care products (toothpaste), to evaluate the human dermal exposure risk. A dispersive solid-phase extraction is proposed, using QuEChERS methodology, followed by HPLC with fluorescence detection. Some extraction parameters were studied, like the ratio of sample/solvent amounts, the homogenization time, the salt addition effect and the used sorbents. The validation parameters of the developed method were the following: a linearity range of 0.005-1.002 mg kg⁻¹ sample, a limit of detection of 0.001 mg kg⁻¹ sample, repeatability between 0.7% and 11.3% (variation coefficient of six standard injections), an intermediate precision of 2.5% (variation coefficient of six independent analysis of the same sample), mean recoveries ranging from 65% (soap bar) to 95% (body cream) and 3% of global uncertainty in most of the working range. The time of analysis, including the extraction steps, is 60 min, allowing a throughput of 4 samples h⁻¹ . Galaxolide was detected in all of the seven analysed products in concentrations ranging from 0.04 ± 0.01 mg kg⁻¹ sample (toothpaste) to 280.78 ± 8.19 mg kg⁻¹ sample (perfumed body cream), which may correspond to a significant estimated daily human dermal exposure of 904 μg day⁻¹.info:eu-repo/semantics/publishedVersio

Análise da patogenicidade de Fusarium spp e Phytophtora palmivora à pupunheira.

Resumo

Aplicação de nitrogênio em cobertura no arroz irrigado monitorada com o uso do sensor portátil.

Objetivou-se com este estudo determinar o desempenho da cultivar BRS Tropical de arroz irrigado influenciado pela segunda aplicação em cobertura de doses de duas fontes de N baseada no uso do clorofilômetro

Desempenho do arroz irrigado influenciado pela adubação nitrogenada baseada no uso do clorofilômetro.

O objetivo deste estudo foi determinar a influência da segunda aplicação em cobertura de doses de duas fontes de N baseada no uso do clorofilômetro no desempenho da cultivar BRS Tropical de arroz irrigado.Pôster - graduação

A Dimensional Reduction Algorithm and Software for Acyclically Dependent Constraints

For discrete equations of motion with acyclic equality constraints and within the context of the null-space method, an original Algorithm is introduced. By first permuting and then topologically ordering the degrees-of-freedom in the constraint gradient matrix, the saddle point problem can be solved with a sparse triangular system for the constraint equations. In this work, we show that saddle problems resulting from constrained (nonlinear) mechanical problems can always be set in this form, with constraint pivots being selected a priori. Given n discrete motion equations and m equality constraints, the original square sparse (n+m)2 ( n + m ) 2 system is replaced by a sparse system (n−m)2 ( n − m ) 2 and a sparse triangular solve with m2 coefficients and n – m right-hand sides. This triangular solve, which involves three sparse matrices (in existing literature only two of the three matrices are sparse), is here discussed in detail. Seven sparse operations are addressed (five standard and two nonstandard) in addition to some specific ad-hoc operations. Algorithms, source code and examples are presented in this work

Grupos de compatibilidade de isolados de Phytophthora nicotianae de acácia-negra.

Resumo

Manual de catalogação: descrição de recursos eletrônicos na Agência de Informação Embrapa: versão 1.2.

bitstream/CNPTIA/11030/1/doc53.pdfAcesso em 01 dez. 2005