Publications by authors named "Silvia Farias"

Materials were prepared for schoolteachers and healthcare workers to support permanent initiatives in food and nutrition education in schools, integrated into the curriculum. The article presents the matrix of food and nutrition topics that served as the basis for producing these materials (Matrix) and the convergence between the approach adopted in the activities in the Activity Manuals comprising the series of materials and food dimensions, the principles of the Framework for Food and Nutrition Education for Public Policies (Framework for Food and Nutrition Education), and the Brazilian National Curriculum Guidelines for basic education. The Matrix allowed designing educational activities that foster an expanded approach to food and nutrition which is simultaneously crosscutting and integrated into the curriculum.

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Article Synopsis
  • Chagas disease, caused by a protozoan parasite, affects 6-7 million people, primarily in Latin America, and this study examines how different types of fat in diets impact infection in mice.
  • Mice were fed either a monounsaturated (olive oil) or saturated (lard) diet before being infected with a strain of the parasite; results showed that the lard diet led to increased parasitic load and inflammation in heart and fat tissues.
  • The study found that the lard diet was linked to altered liver antioxidant levels and increased inflammatory response in cardiac tissue, suggesting that the type of dietary lipids can influence parasite growth and immune response.
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The protozoan is responsible for triggering a damage immune response in the host cardiovascular system. This parasite has a high affinity for host lipoproteins and uses the low-density lipoprotein (LDL) receptor for its invasion. Assuming that the presence of LDL cholesterol in tissues could facilitate proliferation, dietary composition may affect the parasite-host relationship.

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Chronic exposure to inorganic arsenic (As) is associated with numerous adverse effects. Argentina is one of the countries affected by arsenicism; however, there are few studies that evaluate inorganic As exposure and its effects on child population. The aim of this study is to evaluate exposure to As through water and food in child populations living in the provinces of Santiago del Estero and Chaco (n = 101), and to determine the impact of this exposure analysing biomarkers of exposure (urine and hair As contents) and effect [8-oxo-7,8-dihydro-2'-deoxyguanosine (8-OHdG)].

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Nursing professionals working in Emergency Care suffer from the physical symptoms of stress in their everyday activity. The objective of this study was to characterize these symptoms using the Occupational Stress Indicator, a semi-structured instrument. To do this, the authors created open questions that were applied in interviews that were recorded and analyzed.

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A novel method has been developed to determine As-containing animal feed additives including roxarsone (ROX), p-arsanilic acid (p-ASA) and nitarsone (NIT), as well as other organic As species (dimethylarsonic acid (DMAA) and monomethylarsonic acid (MMAA)) by ion-pairing high-performance liquid chromatography coupled to hydride generation atomic fluorescence spectrometry (IP-HPLC-HG-AFS). A simple isocratic reversed-phase (RP) HPLC method with a mobile phase containing citric acid and sodium hexanesulfonate (pH 2.0) was developed using a C(18) column.

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The Antarctic region offers unparalleled possibilities of investigating the natural distribution of metals and metalloids, such as arsenic. Total and inorganic As were analysed in nine species of Antarctic macroalgae collected during the 2002 summer season in the Potter Cove area at Jubany-Dallmann Station (South Shetland Islands, Argentinian Base). Total As was determined by inductively coupled plasma-optical emission spectrometry after microwave-assisted acid digestion.

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Baseline concentration levels of As, B, Ca, Cd, Cr, Cu, Co, Fe, Mg, Mn, Mo, Ni, P, Pb, Se, V, and Zn were determined for Porphyra columbina and Ulva sp. collected from three locations along San Jorge Gulf, in Patagonia Argentina. Elements were quantified by inductively coupled plasma-optical emission spectrometry, with the exception of lead and cadmium in some samples which were determined by electrothermal atomic absorption spectrometry.

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Total arsenic in nine species Antarctic macro algae has been measured, by electrothermal atomic absorption spectrometry using a Pd/Mg(NO3)2 matrix modifier, to determine their capacity to accumulate the element. Macro algae were collected in February during the 2000 austral summer season at Jubany Station (Argentinean scientific station) around Potter Cove, King George Island. An optimized two-step microwave (MW) program was used to digest the samples.

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Volatile species of Zn were generated by merging acidified aqueous samples and sodium tetrahydroborate(III) solution in a continuous flow system. The gaseous analyte was subsequently introduced via a stream of Ar carrier into the inlet tube of the plasma torch. Inductively coupled plasma optical emission spectrometry (ICP-OES) was used for detection.

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Natural contamination with arsenic and other toxic trace elements was studied on a 50,000 km(2) area of the Pampean Plain in Argentina. The locations where natural sources of arsenic are considered to be of concern continue to grow, and include those associated with soils developed on loess or loessic sediments zones and transported volcanic materials sites. Contents of total arsenic, vanadium, chromium, iron and barium higher than those recommended as maximum allowable levels in drinking waters have been measured.

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