Thermal tools to evaluation of decayed and weathered wood polymer composites prepared by in situ polymerization.

This study aims to apply thermal tools in the evaluation of decayed and weathered wood polymer composites prepared by in situ polymerization of methyl methacrylate (MMA) using glycidyl methacrylate (GMA) and methacrylic acid (MAA) as cross-linkers. The pine wood samples were impregnated in a vacuum/pressure system and polymerized in an oven at 90°C for 10h, using benzoyl peroxide at 1.5 wt% as catalyst. The untreated wood and composites were exposed to in vitro decay tests with Trametes versicolor and Gloeophyllum trabeum fungi, and to artificial weathering. The weight loss after tests was measured, and the characterization was performed by thermogravimetric (TGA) and differential scanning calorimetry (DSC) analysis. The mass loss caused by exposure to fungi was evidently higher in untreated wood in relation to the composites, ~2.5 to 10 times - the composites with GMA and MAA showed the highest resistance to both fungi. The composites without cross-linkers showed the higher mass loss in the artificial weathering tests (>11%), due to the leaching of part of poly(MMA) formed inside wood. By TGA and DSC analysis, we observed shifting in the temperature of thermal events related to polysaccharides and lignin after exposed to decays tests ? more significant changes were for Trametes versicolor tests. The thermograms related to weathered samples showed different results for each composite. The untreated wood and the composite without cross-linker presented loss in lignin, meanwhile the composites with cross-linkers presented degradation in the copolymer formed onto surface of wood. Keywords: TGA, DSC, pinewood, methacrylate, additivesCBRATEC

Avaliação econômico-financeira de sistemas de produção orgânica de 'Niágara Rosada'.

Dado que o desenvolvimento de sistemas de produção orgânica, em relação aos convencionais, implica em mudanças importantes na estrutura e na tecnologia empregadas, buscou-se mensurar e analisar, em condições determinísticas e de riscos, os níveis de eficiência econômica e de viabilidade financeira da produção orgânica de 'Niágara Rosada', sem e com o uso de cobertura plástica, desenvolvida pela Embrapa Uva e Vinho.bitstream/item/124077/1/Circular-Tecnica-101.pd

Thermal analysis of byproducts from fast-pyrolysis of Eucalyptus flour.

Fast pyrolysis is the thermal decomposition of biomass in the absence of oxygen. This study aims to evaluate thermal analysis of byproducts from fast-pyrolysis of Eucalyptus wood fines. The pyrolysis was conducted in a pilot-scale at 500°C and 100 mm H2O. Charcoal from this process showed high ash content (over than 20%) and incomplete carbonization. Aqueous extract and bio-oil showed similar thermal decomposition events. However, mass percentage decomposed at each temperature was different between these samples.Edição dos Anais do 7º Simpósio de Análise Térmica, 2015, Bauru

Ética na Embrapa.

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O complexo agroindustrial da soja brasileira.

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Thermal tool in the evaluation of the "pinhão'' (seed of Araucaria angustifolia) starch aimed agroindustrial process.

''Pinhão'' is an important source of food for inhabitants in the subtropical region of South America. Gelatinization temperatures for ''pinhão'' are smaller than for corn and cassava starches, bringing advantages in industrial processes. The ''pinhão'' starches of the 4 different provenances were subjected to dilutions of 1:4, 1:5 e 1:6, in water. The starches were evaluated using DSC to determine gelatinization characteristics of them. The results showed that the source and dilutions have influence in the gelation process of the starch.Edição dos Anais do 7º Simpósio de Análise Térmica, 2015, Bauru

Feasibility and effectiveness assessment of sars-cov-2 antigenic tests in mass screening of a pediatric population and correlation with the kinetics of viral loads

The gold standard for diagnosis of SARS-CoV-2 infection has been nucleic acid amplification tests (NAAT). However, rapid antigen detection kits (Ag-RDTs), may offer advantages over NAAT in mass screening, generating results in minutes, both as laboratory-based test or point-of-care (POC) use for clinicians, at a lower cost. We assessed two different POC Ag-RDTs in mass screening versus NAAT for SARS-CoV-2 in a cohort of pediatric patients admitted to the Pediatric Emergency Unit of IRCCS—Polyclinic of Sant’Orsola, Bologna (from November 2020 to April 2021). All patients were screened with nasopharyngeal swabs for the detection of SARS-CoV-2-RNA and for antigen tests. Results were obtained from 1146 patients. The COVID-19 Ag FIA kit showed a baseline sensitivity of 53.8% (CI 35.4–71.4%), baseline specificity 99.7% (CI 98.4–100%) and overall accuracy of 80% (95% CI 0.68–0.91); the AFIAS COVID-19 Ag kit, baseline sensitivity of 86.4% (CI 75.0–93.9%), baseline specificity 98.3% (CI 97.1–99.1%) and overall accuracy of 95.3% (95% CI 0.92– 0.99). In both tests, some samples showed very low viral load and negative Ag-RDT. This disagreement may reflect the positive inability of Ag-RDTs of detecting antigen in late phase of infection. Among all cases with positive molecular test and negative antigen test, none showed viral loads > 106 copies/mL. Finally, we found one false Ag-RDTs negative result (low cycle thresholds; 9 × 105 copies/mL). Our results suggest that both Ag-RDTs showed good performances in detection of high viral load samples, making it a feasible and effective tool for mass screening in actively infected children

Zoneamento para a fruticultura em Mato Grosso do Sul.

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Clima.

Considerando as características climáticas do estado e o cultivo sob irrigação por inundação, a época de semeadura do arroz, em Mato Grosso do Sul, é determinada pela temperatura. A radiação solar define principalmente o período de melhor aproveitamento da intensidade da insolação e os demais elementos meteorológicos complementam as condições ambientais, eventualmente causando algum nível de prejuízo, quando da ocorrência de anomalias extremas.bitstream/item/214626/1/CNPAF-2009-p20.pd