Patrícia Pereira‐Silva, Diana I. Meira, Augusto Costa‐Barbosa, Diogo Costa, Marco S. Rodrigues, Joel Borges, A. V. Machado, A. Cavaleiro, Paula Sampaio, F. Vaz,
Optical biosensors based on localized surface plasmon resonance (LSPR) are the future of label-free detection methods. This work reports the development of plasmonic thin films, containing Au nanoparticles dispersed in a TiO2 matrix, as platforms for LSPR biosensors. Post-deposition treatments were employed, namely annealing at 400 °C, to develop an LSPR band, and Ar plasma, to improve the sensitivity of the Au-TiO2 thin film. Streptavidin and biotin conjugated with horseradish peroxidase (HRP) were ...
Tópico(s): Advanced Biosensing Techniques and Applications
2022 - Multidisciplinary Digital Publishing Institute | Nanomaterials
Produção Nacional
Revisado por pares
Fábio A. Duarte, Bruno Meira Soares, Augusto Alves Vieira, Éderson R. Pereira, Juliana Villela Maciel, Sergiane Souza Caldas, Ednei Gilberto Prímel,
This paper reports, for the first time, the development of an analytical method employing modified matrix solid-phase dispersion (MSPD) for the extraction of CH3Hg(+) and Hg(2+) species from fish samples. Separation and determination of mercury species were performed by gas chromatography coupled to mass spectrometry (GC/MS). Important MSPD parameters, such as sample mass, type and mass of solid support, concentration of extraction solution (HCl and NaCl), and stirring time, were investigated by the ...
Tópico(s): Environmental Toxicology and Ecotoxicology
2013 - American Chemical Society | Analytical Chemistry
Produção Nacional
Revisado por pares
Luiz F. Pires, Klaus Reichardt, Miguel Cooper, Fabio Augusto Meira Cássaro, Nívea Maria Piccolomini Dias, Osny Oliveira Santos Bacchi,
Soil pore structure characterization using 2-D image analysis constitutes a simple method to obtain essential information related to soil porosity and pore size distribution (PSD). Such information is important to infer on soil quality, which is related to soil structure and transport processes inside the soil. Most of the time soils are submitted to wetting and drying cycles (W-D), which can cause important changes in soils with damaged structures. This report uses 2-D image analysis to evaluate ...
Tópico(s): Soil Carbon and Nitrogen Dynamics
2009 - Brazilian Academy of Sciences | Anais da Academia Brasileira de Ciências
Tânia Toyomi Tominaga, Fabio Augusto Meira Cássaro, Osny Oliveira Santos Bacchi, Klaus Reichardt, J. C. M. Oliveira, Luís Carlos Timm,
The change in management practices of the sugarcane crop in Brazil, from the traditional trash burning before harvest to the new practice that leaves harvest residues on the field after harvest, can lead to alterations in the water regime and also in soil compaction levels. In this study a neutron-gamma surface gauge was used to monitor spatial and temporal variabilities of soil moisture and density in a experimental sugarcane area submitted to 3 harvest management practices: (i) mulched crop with ...
Tópico(s): Soil Moisture and Remote Sensing
2002 - CSIRO Publishing | Soil Research
Produção Nacional
Revisado por pares
Luís Carlos Timm, J. C. M. Oliveira, Tânia Toyomi Tominaga, Fabio Augusto Meira Cássaro, Klaus Reichardt, Osny Oliveira Santos Bacchi,
The quantification of soil water balance components was conducted in a sugarcane (Saccharum officinarum L.) field differently managed, as well as a qualitative analysis of the methodologies used for their estimation. The study was conducted in randomized block experiment with four replicates and three treatments: bare soil, mulched soil using trash left on the soil surface after harvest, and soil with burnt trash. The soil was classified as a Rhodic Kandiudalf, locally called 'Terra Roxa Estruturada', ...
Tópico(s): Soil and Unsaturated Flow
2002 - UNIVERSIDADE FEDERAL DE CAMPINA GRANDE | Revista Brasileira de Engenharia Agrícola e Ambiental
Produção Nacional
Revisado por pares
María Basanta, Durval Dourado Neto, Klaus Reichardt, Osny Oliveira Santos Bacchi, J. C. M. Oliveira, Paulo César Ocheuze Trivelin, Luís Carlos Timm, Tânia Toyomi Tominaga, Vládia Correchel, Fabio Augusto Meira Cássaro, Luiz F. Pires, Júlia Rodrigues Macedo,
Tópico(s): Soil Management and Crop Yield
2003 - Elsevier BV | Geoderma
Produção Nacional
Revisado por pares
Luís Carlos Timm, Klaus Reichardt, J. C. M. Oliveira, Fabio Augusto Meira Cássaro, Tânia Toyomi Tominaga, Osny Oliveira Santos Bacchi, Durval Dourado Neto,
The effects of soil properties on crop growth and yield have traditionally been analyzed using classical statistics methodologies. These methodologies do, however, not consider sampling position coordinates and assume independence between samples. This study had the objective of using the state-space approach, which considers sampling position, to evaluate and to discuss a spatial process using variables related to the soil–plant system. For this, six data sets were collected in a sugarcane experiment ...
Tópico(s): Rice Cultivation and Yield Improvement
2003 - Elsevier BV | Journal of Hydrology
Produção Nacional
Revisado por pares
Leonardo David Tuffi Santos, Bruno Francisco Sant'Anna‐Santos, Renata Maria Strozi Alves Meira, Rafael Augusto Soares Tibúrcio, F.A. Ferreira, Christiane Augusta Diniz Melo, E.F.S. Silva,
A sintomatologia é um dos principais critérios adotados para avaliar os danos causados por fatores bióticos e abióticos em plantas. Contudo, aspectos microscópicos são necessários na compreensão dos mecanismos de intoxicação e no diagnóstico precoce da injúria. Objetivou-se no presente estudo avaliar os efeitos da deriva simulada de quatro formulações comerciais de glyphosate (Scout®, Roundup NA®, Roundup transorb® e Zapp QI®) sobre a morfoanatomia foliar de seis clones de Eucalyptus grandis (UFV01, ...
Tópico(s): Plant tissue culture and regeneration
2008 - Sociedade Brasileira da Ciência das Plantas Daninhas | Planta Daninha
Produção Nacional
Revisado por pares
Luiz F. Pires, Fabio Augusto Meira Cássaro, Klaus Reichardt, Osny Oliveira Santos Bacchi,
Soil water retention curves (SWRCs) relate soil water pressure head (h) to soil water content (θ) and can also be used to find information regarding soil pore distribution. To analyze SWRCs in relation to pore size distribution (PSD), changes due to wetting and drying (W–D) cycles were studied in three different tropical soils (Geric Ferralsol, GF; Eutric Nitosol, EN; Rhodic Ferralsol, RF), using three different treatments: T0, the control with samples not submitted to W–D cycles; T3, samples submitted ...
Tópico(s): Groundwater flow and contamination studies
2008 - Elsevier BV | Soil and Tillage Research
Produção Nacional
Revisado por pares
Luiz F. Pires, Fabio Augusto Meira Cássaro, Osny Oliveira Santos Bacchi, Klaus Reichardt,
A gamma-ray computed tomography (CT) scanner was used to evaluate changes in the structure of clayey soil samples with surface compaction submitted to wetting and drying (W–D) cycles. The obtained results indicate that W–D cycles promoted an increasing of about 10% in soil porosity with a decreasing of about 6% in soil bulk density of this compacted region. With the use of the CT it was also possible to define the thickness of the compacted region that in our case was of about 8.19 mm. This last information ...
Tópico(s): Geophysical Methods and Applications
2010 - Elsevier BV | Radiation Physics and Chemistry
Produção Nacional
Revisado por pares
Thalita Silva Martins, Sérgio da Costa Saab, D. M. B. P. Milori, André Maurício Brinatti, Jadir Aparecido Rosa, Fabio Augusto Meira Cássaro, Luiz F. Pires,
In this work is presented the use of the C/N ratio and the Laser Induced Fluorescence (LIF) spectroscopy for determining the humification of soil organic matter (SOM) in an Oxisol under three different long-term tillage managements (no-tillage (NT), reduced tillage (RT) and conventional tillage (CT)). Humification of SOM was evaluated in the soil and its fractions (clay < 2 μm, silt 2–20 μm, sand 20–1000 μm). The obtained results show that lower SOM humification was observed in soil under NT, mainly at the ...
Tópico(s): Soil and Water Nutrient Dynamics
2010 - Elsevier BV | Soil and Tillage Research
Produção Nacional
Revisado por pares
Fabio Augusto Meira Cássaro, Angelo Kuhn Borkowski, Luiz F. Pires, Jadir Aparecido Rosa, Sérgio da Costa Saab,
In this paper is presented the use of soil water retention curves (SWRC) to investigate modifications in pore size distribution (PSD) of a Rhodic Ferralsol submitted to two different long term management practices: no-tillage (NT) and conventional tillage (CT). Soils from both treatments were investigated in 3 different depths, 0–10, 10–20, and 20–30 cm and matric potential values that varied from 0 to −780 kPa. The obtained results showed trimodal PSDs for both treatments, indicating well structured ...
Tópico(s): Clay minerals and soil interactions
2010 - Elsevier BV | Soil and Tillage Research
Produção Nacional
Revisado por pares
Luiz F. Pires, Miguel Cooper, Fabio Augusto Meira Cássaro, Klaus Reichardt, Osny Oliveira Santos Bacchi, Nívea Maria Piccolomini Dias,
The physical characteristics of the soil surface are of extreme importance in relation to energy and matter transfer processes between the atmosphere and the soil. Soil internal structure changes can be due to natural or artificial causes and one important natural process is the alternation of wetting and drying (W–D) processes, which induce swelling and shrinking of soil particles, causing modifications in pore size and shape. To study the consequence of these W–D events on possible modifications ...
Tópico(s): Soil erosion and sediment transport
2007 - Elsevier BV | CATENA
Produção Nacional
Revisado por pares
Bruno Meira Soares, Augusto Alves Vieira, Juliana Silva Lemões, Clarissa Santos, Márcia F. Mesko, Ednei Gilberto Prímel, Marcelo G. Montes D’Oca, Fábio A. Duarte,
This work reports, for the first time, the determination of major and trace elements (Al, As, Ba, Ca, Cd, Co, Cr, Cu, Fe, K, La, Mg, Mn, Mo, Na, Ni, P, Pb, S, Se, Sn, Sr, Ti, Tl, U, V, and Zn) in the fractions of the synthesis of fatty acid methyl esters (FAMEs). These include fresh microalgae, residual biomass, lipid fraction, crude FAMEs, insoluble fraction and purified FAMEs from microalgae Chlorella sp. A microwave-assisted digestion procedure in closed vessels was applied for sample digestion ...
Tópico(s): Biodiesel Production and Applications
2012 - Elsevier BV | Bioresource Technology
Produção Nacional
Revisado por pares
Luis Valério Prandel, Sérgio da Costa Saab, André Maurício Brinatti, Neyde Fabíola Balarezo Giarola, Wellington Leite, Fabio Augusto Meira Cássaro,
Diffraction and spectroscopic techniques have been shown to be suitable for obtaining physical and mineralogical properties in polycrystalline soil samples, and also in their precursor compounds. For instance, the X-ray fluorescence (XRF) spectroscopy allows obtaining the elemental composition of an investigated sample, while the X-ray diffraction (XRD) technique permits obtaining qualitative and quantitative composition of the soil minerals through the Rietveld method (RM). In this study Yellow Latosol ( ...
Tópico(s): Iron oxide chemistry and applications
2012 - Elsevier BV | Radiation Physics and Chemistry
Produção Nacional
Revisado por pares
Luís Carlos Timm, Klaus Reichardt, J. C. M. Oliveira, Fabio Augusto Meira Cássaro, Tânia Toyomi Tominaga, Osny Oliveira Santos Bacchi, Durval Dourado Neto, D. R. Nielsen,
The state-space approach is used to evaluate the relation between soil physical and chemical properties in an area cultivated with sugarcane. The experiment was carried out on a Rhodic Kandiudalf in Piracicaba, State of São Paulo, Brazil. Sugarcane was planted on an area of 0.21 ha i.e., in 15 rows 100 m long, spaced 1.4 m. Soil water content, soil organic matter, clay content and aggregate stability were sampled along a transect of 84 points, meter by meter. The state-space approach is used to ...
Tópico(s): Irrigation Practices and Water Management
2004 - Sociedade Brasileira de Ciência do Solo | Revista Brasileira de Ciência do Solo
Produção Nacional
Revisado por pares
J. C. M. Oliveira, Klaus Reichardt, Osny Oliveira Santos Bacchi, Luís Carlos Timm, Durval Dourado Neto, Paulo César Ocheuze Trivelin, Tânia Toyomi Tominaga, Roberta de Castro Navarro, Marisa de Cássia Píccolo, Fabio Augusto Meira Cássaro,
Results of an organic matter management experiment of a sugar cane crop are reported for the first cropping year. Sugar cane was planted in October 1997, and labeled with a 15N fertilizer pulse to study the fate of organic matter in the soil-plant system. A nitrogen balance is presented, partitioning the system in plant components (stalk, tip and straw), soil components (five soil organic matter fractions) and evaluating leaching losses. The 15N label permitted to determine, at the end of the growing ...
Tópico(s): Rice Cultivation and Yield Improvement
2000 - UNIVERSIDADE DE SÃO PAULO | Scientia Agricola
Produção Nacional
Revisado por pares
Luiz F. Pires, André Maurício Brinatti, Sérgio da Costa Saab, Fabio Augusto Meira Cássaro,
Gamma-ray computed tomography (CT) was employed to study the soil quality of clod samples used to investigate porosity (ϕ). Samples with volumes varying from 50 to 100 cm3 were collected from the soil surface. 2D CT images were obtained with millimetric resolution. Porosity distribution analyses were carried out to infer the soil clod structure. Results obtained provided a new insight on the variability of internal clod structure due to the large amount of data analyzed, information that is not provided ...
Tópico(s): Landslides and related hazards
2014 - Elsevier BV | Applied Radiation and Isotopes
Produção Nacional
Revisado por pares
Jaqueline A.R. Borges, Luiz F. Pires, Fabio Augusto Meira Cássaro, Waldir L. Roque, Richard J. Heck, Jadir Aparecido Rosa, Fabiano G. Wolf,
The representative elementary volume (REV) is related to the minimum size of a sample that is necessary for representative measurements of a property. The REV is frequently investigated in samples with characteristic sizes extending from millimeters to few centimeters. Most of the time, the obtained information in this kind of study does not reveal any important detail of the inner structure of a porous medium. Something that can only be attained using some high spatial resolution image analysis ...
Tópico(s): Mineral Processing and Grinding
2018 - Elsevier BV | Soil and Tillage Research
Produção Nacional
Revisado por pares
Jaqueline A.R. Borges, Luiz F. Pires, Fabio Augusto Meira Cássaro, André Carlos Auler, Jadir Aparecido Rosa, Richard J. Heck, Waldir L. Roque,
The sustainability and efficiency of crop production are sometimes dependent on the adopted tillage system. In Brazil, conservation systems such as no-tillage (NT) have been adopted as an alternative to conventional tillage (CT) method. Conservation tillage systems usually tend to minimize soil losses, water runoff, preserve soil moisture and reduce the disruption of the soil structure. Nevertheless, the influence of these managements in the soil porous system, in the micrometric point of view, is ...
Tópico(s): Soil erosion and sediment transport
2018 - Elsevier BV | Soil and Tillage Research
Produção Nacional
Revisado por pares
André Carlos Auler, Fabio Augusto Meira Cássaro, V.O. da Silva, Luiz F. Pires,
This study aimed to analyze how meteorological conditions such as temperature, humidity and rainfall can affect the spread of COVID-19 in five Brazilian (São Paulo, Rio de Janeiro, Brasília, Manaus and Fortaleza) cities. The cities selected were those with the largest number of confirmed cases considering data of April 13. Variables such as number of cumulative cases, new daily cases and contamination rate were employed for this study. Our results showed that higher mean temperatures and average ...
Tópico(s): COVID-19 impact on air quality
2020 - Elsevier BV | The Science of The Total Environment
Produção Nacional
Revisado por pares
Jocenei A. T. de Oliveira, Fabio Augusto Meira Cássaro, Luiz F. Pires,
Porous systems such as soils tend to present great complexity when analyzed at the micrometer-scale. Processes such as tillage and repeated wetting and drying (W-D) cycles tend to continuously alter the structure of the soil. X-ray computed microtomography (μCT) is one of the techniques that can be utilized for quantifying changes in the soil micrometer-scale structure. The objective of this study was to analyze the effect of W-D cycles in the soil porous system of core samples submitted to contrasting ...
Tópico(s): Soil Carbon and Nitrogen Dynamics
2020 - Elsevier BV | Soil and Tillage Research
Produção Nacional
Revisado por pares
Fabio Augusto Meira Cássaro, Luiz F. Pires,
This study aimed to present a simple model to follow the evolution of the COVID-19 (CV-19) pandemic in different countries. The cumulative distribution function (CDF) and its first derivative were employed for this task. The simulations showed that it is almost impossible to predict based on the initial CV-19 cases (1st 2nd or 3rd weeks) how the pandemic will evolve. However, the results presented here revealed that this approach can be used as an alternative for the exponential growth model, traditionally ...
Tópico(s): COVID-19 impact on air quality
2020 - Elsevier BV | The Science of The Total Environment
Produção Nacional
Revisado por pares
Talita R. Ferreira, Nathaly Lopes Archilha, Fabio Augusto Meira Cássaro, Luiz F. Pires,
Studies on how the alteration in the soil pore architecture can influence the permeability of small soil aggregates are still scarce. These aggregates affect the water dynamics mainly at the intra-aggregate pore scale. Thus, investigating the intra-aggregate pore space properties becomes crucial for comprehending the matter and energy transported into the soil. This paper focuses on analyzing the permeability and hydraulic conductivity of small soil aggregates from contrasting tillage systems (no- ...
Tópico(s): Landslides and related hazards
2023 - Elsevier BV | Soil and Tillage Research
Produção Nacional
Revisado por pares
Durval Dourado Neto, Luís Carlos Timm, J. C. M. Oliveira, Klaus Reichardt, Osny Oliveira Santos Bacchi, Tânia Toyomi Tominaga, Fabio Augusto Meira Cássaro,
The state-space approach is used to describe surface soil water content and temperature behaviour, in a field experiment in which sugarcane is submitted to different management practices. The treatments consisted of harvest trash mulching, bare soil, and burned trash, all three in a ratoon crop, after first cane harvest. One transect of 84 points was sampled, meter by meter, covering all treatments and borders. The state-space approach is described in detail and the results show that soil water ...
Tópico(s): Soil Geostatistics and Mapping
1999 - UNIVERSIDADE DE SÃO PAULO | Scientia Agricola
Produção Nacional
Revisado por pares
Fabio Augusto Meira Cássaro, Adolfo Posadas, Daniel Giménez, Carlos Manoel Pedro Vaz,
Core Ideas X‐ray microtomography. An image‐based approach to determine soil pore distributions. Integration between information obtained in different spatial resolutions. Soil pores form interconnected networks that directly or indirectly influence transport processes in soils. There is great interest in estimating pore properties such as size and shape from three‐dimensional (3D) images as a way of understanding linkages between structure and function. This work evaluates the applicability of an ...
Tópico(s): Groundwater flow and contamination studies
2017 - Wiley | Soil Science Society of America Journal
Patrick Glauner, Jorge Augusto Meira, Petko Valtchev, Radu State, Franck Bettinger,
Detection of non-technical losses (NTL) which include electricity theft, faulty meters or billing errors has attracted increasing attention from researchers in electrical engineering and computer science.NTLs cause significant harm to the economy, as in some countries they may range up to 40% of the total electricity distributed.The predominant research direction is employing artificial intelligence to predict whether a customer causes NTL.This paper first provides an overview of how NTLs are defined ...
Tópico(s): Water Systems and Optimization
2017 - Springer Nature | International Journal of Computational Intelligence Systems
Produção Nacional
Revisado por pares
Jocenei A. T. de Oliveira, Fabio Augusto Meira Cássaro, Luiz F. Pires,
Agricultural soils are extremely susceptible to changes due to agricultural practices. Conventional tillage (CT), minimum tillage (MT) and no-tillage (NT) are examples of important management systems largely utilized in Brazil, one of the world's leading producers of coffee, sugar, soybean, corn, and many other agricultural products. Evaluate how these managements disturb the soil structure at the micrometric scale constitutes one of the major challenges for the soil scientists. Due to its potential ...
Tópico(s): Soil Carbon and Nitrogen Dynamics
2021 - Elsevier BV | Soil and Tillage Research
Produção Nacional
Revisado por pares
Renata Alves Meira Massaro, César Augusto Valencise Bonine, Edimar Aparecido Scarpinati, Rinaldo César de Paula,
Com o objetivo de avaliar a eficiência da seleção precoce em Eucalyptus spp. foram usados dados de dois testes clonais avaliados quanto ao crescimento em altura (ALT), diâmetro à altura do peito (DAP) e volume individual de madeira (VOL) aos 25, 50 e 72 meses de idade. O delineamento experimental nos dois testes clonais foi o de blocos casualizados, com trinta tratamentos (clones), seis repetições, sendo um deles com seis e o outro com dez plantas em linha por parcela, no espaçamento de 3,0 m x 3,0 ...
Tópico(s): Soil Management and Crop Yield
2010 - UNIVERSIDADE FEDERAL DE SANTA MARIA | Ciência Florestal
Produção Nacional
Revisado por pares
Reginaldo Ferreira da Silva, Rosemary Gualberto Fonseca Alvarenga Pereira, Flávio Meira Borém, Joel Augusto Muniz,
O café-cereja descascado vem conquistando cada vez mais espaço nas diversas regiões produtoras de café. Considerando os diversos questionamentos sobre a qualidade dos grãos resultantes desse tipo de processamento, os poucos estudos sobre o assunto e as contradições observadas nos resultados obtidos até o momento, com o presente estudo teve-se por objetivo caracterizar a qualidade do café-cereja descascado produzido na região sul do Estado de Minas Gerais, bem como averiguar a influência da altitude ...
Tópico(s): Coffee research and impacts
2004 - UNIVERSIDADE FEDERAL DE LAVRAS | Ciência e Agrotecnologia