Produção Nacional
Revisado por pares
João Flávio da Silveira Petruci, Arnaldo Alves Cardoso,
A new palladium chelate compound is described for the determination of sulfide in aqueous samples. The reagent, bis(2-aminobenzoate)palladium(II) (PdA2), was prepared by reaction of tetrachloropalladate (PdCl4−) with 2-aminobenzoic acid. The compound was characterized by infrared spectroscopy and CHN elemental analysis. The measurement was based on the selective reaction of PdA2 with sulfide in an aqueous medium, which quantitatively produced fluorescent 2-aminobenzoate (λex = 245 nm, λem = 410 nm). The ...
Tópico(s): Electrochemical Analysis and Applications
2012 - Elsevier BV | Microchemical Journal
Produção Nacional
Revisado por pares
João Flávio da Silveira Petruci, Arnaldo Alves Cardoso,
Sampling and measurements without extraction steps.
Tópico(s): Molecular Sensors and Ion Detection
2015 - Royal Society of Chemistry | Analytical Methods
Produção Nacional
Revisado por pares
João Flávio da Silveira Petruci, Arnaldo Alves Cardoso, Andreas Wilk, Vjekoslav Kokoric, Boris Mizaikoff,
In this technical note, we describe an integrated device platform for performing in-flow gaseous conversion reactions based on ultraviolet (UV) irradiation. The system combines, using the same footprint, an integrated UV-conversion device (iCONVERT), a preconcentrator unit (iPRECON), and a new generation of mid-infrared (MIR) gas cell simultaneously serving as a photon conduit, i.e., so-called substrate-integrated hollow waveguide (iHWG) optically coupled to a compact Fourier transform-infrared (FT-IR) ...
Tópico(s): Analytical Chemistry and Sensors
2015 - American Chemical Society | Analytical Chemistry
Produção Nacional
Revisado por pares
José Alexandre Melo Demattê, José Lucas Safanelli, Raúl Roberto Poppiel, Rodnei Rizzo, Nélida Elizabet Quiñonez Silvero, Wanderson de Sousa Mendes, Benito Roberto Bonfatti, André Carnieletto Dotto, Diego Fernando Urbina Salazar, Fellipe Alcântara de Oliveira Mello, Ariane Francine da Silveira Paiva, Arnaldo Barros e Souza, Natasha Valadares dos Santos, Cláudia Maria Oller do Nascimento, Danilo César de Mello, Henrique Bellinaso, Luiz G. Medeiros Neto, Merilyn Taynara Accorsi Amorim, Maria Eduarda Bispo de Resende, Julia da Souza Vieira, Louise Gunter de Queiroz, Bruna Cristina Gallo, Veridiana Maria Sayão, Caroline Jardim da Silva Lisboa,
Abstract The Earth’s surface dynamics provide essential information for guiding environmental and agricultural policies. Uncovered and unprotected surfaces experience several undesirable effects, which can affect soil ecosystem functions. We developed a technique to identify global bare surface areas and their dynamics based on multitemporal remote sensing images to aid the spatiotemporal evaluation of anthropic and natural phenomena. The bare Earth’s surface and its changes were recognized by Landsat ...
Tópico(s): Soil erosion and sediment transport
2020 - Nature Portfolio | Scientific Reports
Produção Nacional
Revisado por pares
Elisabete Alves Pereira, João Flávio da Silveira Petruci, Arnaldo Alves Cardoso,
Tópico(s): Microfluidic and Capillary Electrophoresis Applications
2011 - Springer Science+Business Media | Food Analytical Methods
Produção Nacional
Revisado por pares
Juliano Passaretti Filho, João Flávio da Silveira Petruci, Arnaldo Alves Cardoso,
Nitrogen dioxide (NO2) is an important indicator of atmospheric pollution that is mainly derived from combustion processes. The gas is often present at undesirable levels in both open and closed environments worldwide, requiring monitoring under a variety of different conditions. This work describes the development of a sensitive, selective, and inexpensive method for the determination of NO2 in gaseous samples. The method is based on the processing of digital images of the product of the Griess- ...
Tópico(s): Water Quality Monitoring and Analysis
2015 - Elsevier BV | Talanta
Produção Nacional
Revisado por pares
João Flávio da Silveira Petruci, Arnaldo Alves Cardoso,
Hydrogen sulfide is found in many environments including sewage systems, petroleum extraction platforms, kraft paper mills, and exhaled breath, but its determination at ppb levels remains a challenge within the analytical chemistry field. Off-line methods for analysis of gaseous reduced sulfur compounds can suffer from a variety of biases associated with high reactivity, sorptive losses, and atmospheric oxidative reactions. Here, we present a portable, online, and disposable gas sensor platform ...
Tópico(s): Sulfur Compounds in Biology
2016 - American Chemical Society | Analytical Chemistry
Produção Nacional
Revisado por pares
João Flávio da Silveira Petruci, Andreas Wilk, Arnaldo Alves Cardoso, Boris Mizaikoff,
Abstract Following the Kyoto protocol, all signatory countries must provide an annual inventory of greenhouse-gas emission including N 2 O. This fact associated with the wide variety of sources for N 2 O emissions requires appropriate sensor technologies facilitating in-situ monitoring, compact dimensions, ease of operation, and sufficient sensitivity for addressing such emission scenarios. In this contribution, we therefore describe an innovative portable mid-infrared chemical sensor system for ...
Tópico(s): Analytical Chemistry and Sensors
2018 - Nature Portfolio | Scientific Reports
Produção Nacional
Revisado por pares
João Flávio da Silveira Petruci, Andreas Wilk, Arnaldo Alves Cardoso, Boris Mizaikoff,
Volatile sulfur compounds (VSCs) are among the most prevalent emitted pollutants in urban and rural atmospheres. Mainly because of the versatility of sulfur regarding its oxidation state (2- to 6+), VSCs are present in a wide variety of redox-environments, concentration levels, and molar ratios. Among the VSCs, hydrogen sulfide and sulfur dioxide are considered most relevant and have simultaneously been detected within naturally and anthropogenically caused emission events (e.g., volcano emissions, ...
Tópico(s): Gas Sensing Nanomaterials and Sensors
2015 - American Chemical Society | Analytical Chemistry
Produção Nacional
Revisado por pares
Danilo Manzani, João Flávio da Silveira Petruci, Karina Nigoghossian, Arnaldo Alves Cardoso, Sidney J. L. Ribeiro,
Abstract The determination of temperature is essential in many applications in the biomedical, technological, and industrial fields. Optical thermometry appears to be an excellent alternative for conventional electric temperature sensors because it is a non-contact method that offers a fast response, electromagnetic passivity, and high temperature sensitivity. In this paper, we propose an optical thermometer probe comprising an Er 3+ /Yb 3+ co-doped tellurite glass attached to the tip of an optical ...
Tópico(s): Solid State Laser Technologies
2017 - Nature Portfolio | Scientific Reports
Produção Nacional
Revisado por pares
Paula R. Fortes, João Flávio da Silveira Petruci, Andreas Wilk, Arnaldo Alves Cardoso, Ivo M. Raimundo, Boris Mizaikoff,
Design and analytical performance studies are presented for optimizing a new generation of hollow waveguides suitable for quantitative gas sensing—the so-called substrate-integrated hollow waveguide (iHWG). Taking advantage of a particularly compact Fourier transform infrared spectrometer optimized iHWG geometries are investigated toward the development of a multi-constituent breath analysis tool compatible for usage, e.g., in exhaled mouse breath analysis. Three different iHWG geometries were compared, ...
Tópico(s): Gas Sensing Nanomaterials and Sensors
2014 - IOP Publishing | Journal of Optics
Produção Nacional
Revisado por pares
João Flávio da Silveira Petruci, Elisabete Alves Pereira, Arnaldo Alves Cardoso,
The use of chemical preservative compounds is common in the food products industry. Caramel color is the most usual additive used in beverages, desserts, and breads worldwide. During its fabrication process, 2- and 4-methylimidazole (MeI), highly carcinogenic compounds, are generated. In these cases, the development of reliable analytical methods for the monitoring of undesirable compounds is necessary. The primary procedure for the analysis of 2- and 4-MeI is using LC- or GC-MS techniques. These ...
Tópico(s): Microfluidic and Capillary Electrophoresis Applications
2013 - American Chemical Society | Journal of Agricultural and Food Chemistry
Produção Nacional
Revisado por pares
João Flávio da Silveira Petruci, Peter C. Hauser, Arnaldo Alves Cardoso,
Hydrogen cyanide is a highly toxic compound employed for applications such as electroplating, production of organic solvents, fish stunning, and even as a chemical weapon. In this work, we describe a new microfluidic paper-based assay for selective cyanide determination, based on the reaction of the cyanide anion with palladium dimethylglyoximate (DMG) followed by colorimetric reaction of DMG with nickel. Quantification was performed by measuring the absorbance of light passing through the paper, ...
Tópico(s): Molecular Sensors and Ion Detection
2018 - Elsevier BV | Sensors and Actuators B Chemical
Produção Nacional
Eduardo Angeli Malavolta, Mauro Emílio Conforto Gracitelli, Jorge Henrique Assunção, Gustavo de Mello Ribeiro Pinto, Arthur Silveira, Arnaldo Amado Ferreira Neto,
ABSTRACT OBJECTIVE: To describe shoulder disorders in patients evaluated by two shoulder and elbow surgeons. METHODS: This cross-sectional study analyzed patients evaluated by two authors, excluding acute fractures and dislocations and patients with symptoms not involving the shoulder. Age and sex distribution was determined for the different diagnoses. RESULTS: We evaluated 1001 patients. Mean age was 51.43±15.15 years and 51.0% were female. Disorders of the rotator cuff occurred in 64.3% (41.2% ...
Tópico(s): Nerve Injury and Rehabilitation
2017 - Brazilian Society of Orthopedics and Traumatology | Acta Ortopédica Brasileira
Anabela Maria Bello da Silveira Baptista de Figueiredo Marcos, Arnaldo Coelho,
Purpose The purpose of this paper is to understand the role that communication plays in the insurance industry, as well as its relational outcomes. Design/methodology/approach This investigation proposes a theoretical model tested using structural equation modelling. A questionnaire survey was developed to explore the relationships among communication, reputation, trust, commitment, loyalty and word-of-mouth (WOM). For this study, 744 valid questionnaires were collected from a sample of Portuguese ...
Tópico(s): Digital Marketing and Social Media
2018 - Emerald Publishing Limited | Asia Pacific Journal of Marketing and Logistics
Anabela Maria Bello da Silveira Baptista de Figueiredo Marcos, Arnaldo Coelho,
Purpose The objective of this paper is to understand the relationships between service quality, perceived value and satisfaction because several studies endeavored to model these linkages. It is important to test these relationships with loyalty and word-of-mouth (WOM). Thus, it is important to test these relationships in the insurance sector since the relationship between these variables and WOM has not been studied in insurance. Design/methodology/approach This investigation proposes a theoretical ...
Tópico(s): Consumer Retail Behavior Studies
2021 - Emerald Publishing Limited | The TQM Journal
Produção Nacional
Revisado por pares
Karina Mariante Monteiro, Sandra Mara Naressi Scapin, M.V.A.S. Navarro, Nilson Ivo Tonin Zanchin, Mateus Borba Cardoso, Nádya Pesce da Silveira, Paulo Fernando Bruno Gonçalves, Hubert Stassen, Arnaldo Zaha, Henrique Bunselmeyer Ferreira,
Echinococcus granulosus antigen B is an oligomeric protein of 120–160 kDa composed by 8-kDa (AgB8) subunits. Here, we demonstrated that the AgB8 recombinant subunits AgB8/1, AgB8/2 and AgB8/3 are able to self-associate into high order homo-oligomers, showing similar properties to that of parasite-produced AgB, making them valuable tools to study AgB structure. Dynamic light scattering, size exclusion chromatography and cross-linking assays revealed ~ 120- to 160-kDa recombinant oligomers, with a tendency ...
Tópico(s): Trace Elements in Health
2006 - Elsevier BV | Biochimica et Biophysica Acta (BBA) - Proteins and Proteomics
Produção Nacional
Revisado por pares
João Flávio da Silveira Petruci, Michael G. Liebetanz, Arnaldo Alves Cardoso, Peter C. Hauser,
In this communication, we describe a flow-through optical absorption detector for HPLC using for the first time a deep-UV light-emitting diode with an emission band at 235nm as light source. The detector is also comprised of a UV-sensitive photodiode positioned to enable measurement of radiation through a flow-through cuvette with round aperture of 1mm diameter and optical path length of 10mm, and a second one positioned as reference photodiode; a beam splitter and a power supply. The absorbance ...
Tópico(s): Water Quality Monitoring and Analysis
2017 - Elsevier BV | Journal of Chromatography A
Produção Nacional
Revisado por pares
Sérgio Cimerman, Hélio Arthur Bacha, Maria Cecília Teixeira Ladeira, Orival Silva Silveira, Arnaldo Lopes Colombo,
Paracoccidioidomycosis has been rarely reported among HIV patients, despite being an endemic mycosis in Latin America. The present report illustrates a case of PM in a teenager infected with HIV. Clinicians must be aware that this mycosis may occur in young HIV infected patients who live in endemic areas.
Tópico(s): Nail Diseases and Treatments
1997 - Wiley | Mycoses
Produção Nacional
Revisado por pares
Karina Mariante Monteiro, Mateus Borba Cardoso, Cristian Follmer, Nádya Pesce da Silveira, Daiani Machado de Vargas, Elliot Watanabe Kitajima, Arnaldo Zaha, Henrique Bunselmeyer Ferreira,
Antigen B (AgB) is the major protein secreted by the Echinococcus granulosus metacestode and is involved in key host-parasite interactions during infection. The full comprehension of AgB functions depends on the elucidation of several structural aspects that remain unknown, such as its subunit composition and oligomeric states.The subunit composition of E. granulosus AgB oligomers from individual bovine and human cysts was assessed by mass spectrometry associated with electrophoretic analysis. AgB8/ ...
Tópico(s): Amoebic Infections and Treatments
2012 - Public Library of Science | PLoS neglected tropical diseases
Produção Nacional
Revisado por pares
João Flávio da Silveira Petruci, Arnaldo Alves Cardoso, Elisabete Alves Pereira,
FOODSTUFFS BY CAPILLARY ELECTROPHORESIS.In this work, a rapid and simple method using capillary electrophoresis (CE) was developed for the determination of the benzoate, sorbate, methyl and propylparaben in foodstuffs.A running buffer consisting of 20 mmol L -1 (pH = 9.3) tetraborate enabled separation of the analytes in less than 5 min.The detector wavelength was set at 220 nm.The method was successfully applied to the analysis of sodas, sweeteners, sauces and juices.The range of preservatives found ...
Tópico(s): Biochemical Analysis and Sensing Techniques
2011 - Brazilian Chemical Society | Química Nova
Produção Nacional
Eduardo Angeli Malavolta, Mauro Emílio Conforto Gracitelli, Gustavo de Mello Ribeiro Pinto, Arthur Silveira, Jorge Henrique Assunção, Arnaldo Amado Ferreira Neto,
The aim of this study was to evaluate whether Asian ethnicity is a risk factor for the development of adhesive capsulitis. The secondary aim was to describe the distribution of cases of capsulitis by age group.A cross-sectional study comparing the rate of adhesive capsulitis in individuals of Asian ethnicity with that of other ethnicities. We excluded patients with fractures and those with symptoms not involving the shoulder. The odds ratio was adjusted for confounding factors by binary logistic ...
Tópico(s): Trauma Management and Diagnosis
2018 - Brazilian Society of Orthopedics and Traumatology | Revista Brasileira de Ortopedia (English Edition)
Produção Nacional
Revisado por pares
Vânia Cavalcanti Ribeiro da Silva, Fabiana Moura da Motta Silveira, MARIA GABRIELA BARBOSA MONTEIRO, Mônica Moreira Dias da Cruz, Arnaldo de França Caldas Júnior, Gustavo Pina Godoy,
Oral mucositis has become a major dose-limiting toxicity of antineoplastic treatment.The aim of this study was to evaluate the effect of photodynamic therapy (PDT) and low level laser therapy (LLLT) on the treatment of chemotherapy-induced mucositis in pediatric patients.An open, controlled, and blind, randomized clinical trial was conducted with 29 patients, from 10 months to 18 years old, who were divided into two groups. Group A was submitted to photodynamic therapy (0.01% Methylene Blue and red ...
Tópico(s): Oral and Craniofacial Lesions
2017 - Elsevier BV | Photodiagnosis and Photodynamic Therapy
Produção Nacional
Revisado por pares
Márcio Nucci, Arnaldo Lopes Colombo, Fernanda Silveira, Rosana Richtmann, Reinaldo Salomão, Maria Luíza Moretti Branchini, Nelson Spector,
Abstract Objective: To analyze possible risk factors for death among patients with nosocomial candidemia. To identify risk factors for death in patients with candidemia, we analyzed demographic, clinical, and microbiological data. Setting: Six tertiary hospitals in Brazil. Patients: A cohort of 145 patients with candidemia. Design: 26 possible risk factors for death, including age, underlying disease, signs of deep-seated infection, neutropenia, number of positive blood cultures, removal of a central ...
Tópico(s): Central Venous Catheters and Hemodialysis
1998 - Cambridge University Press | Infection Control and Hospital Epidemiology
Márcio Nucci, Arnaldo Lopes Colombo, Fernanda Silveira, Rosana Richtmann, Reinaldo Salomão, Maria Luíza Moretti Branchini, Nelson Spector,
Objective:To analyze possible risk factors for death among patients with nosocomial candidemia. To identify risk factors for death in patients with candidemia, we analyzed demographic, clinical, and microbiological data.Setting:Six tertiary hospitals in Brazil.Patients:A cohort of 145 patients with candidemia.Design:26 possible risk factors for death, including age, underlying disease, signs of deep-seated infection, neutropenia, number of positive blood cultures, removal of a central venous catheter, ...
Tópico(s): Central Venous Catheters and Hemodialysis
1998 - Cambridge University Press | Infection Control and Hospital Epidemiology
Produção Nacional
Revisado por pares
Daniel Fonseca Segura, João Flávio da Silveira Petruci, Arnaldo Alves Cardoso, Regina C. G. Frem, Adelino V.G. Netto, Neil R. Champness,
The sulfide anion is a corrosive, toxic and harmful compound found in a wide range of anoxic environments. Metal-based complexes have been used as luminescent probes for sulfide determination. However, their synthesis usually involves laborious procedures and the use of toxic reagents. In this paper, we describe the synthesis, characterization and application of a new, sensitive and selective silver complex probe for sulfide detection. The process of sulfide determination is based on rapid reaction ...
Tópico(s): Advanced biosensing and bioanalysis techniques
2015 - Elsevier BV | Inorganic Chemistry Communications
Produção Nacional
Oscar Arnaldo Batista Neto, Marcos Botton Silva, Mauro Silveira Garcia, Alexandre J. da Silva,
O trabalho teve como objetivo avaliar o efeito de inseticidas reguladores de crescimento de insetos (RCI) sobre ovos, lagartas e adultos de G. molesta, em laboratório. Os inseticidas avaliados foram lufenurom e novalurom (4,0g de i.a. 100L-1) metoxifenozida e tebufenozida (9,6g de i.a. 100L-1) e uma testemunha (água destilada). Em aplicação antes da oviposição, somente o metoxifenozida causou mortalidade significativa de ovos (26,3%), quando comparado à testemunha. A aplicação dos inseticidas sobre ovos ...
Tópico(s): Weed Control and Herbicide Applications
2011 - Sociedade Brasileira de Fruticultura | Revista Brasileira de Fruticultura
Produção Nacional
Revisado por pares
João Flávio da Silveira Petruci, Diandra Nunes Barreto, Mariana Amaral Dias, Erika Pereira Felix, Arnaldo Alves Cardoso,
Ground-level ozone has been increasing worldwide, mainly due to the high anthropogenic emissions of NOx and VOCs. In addition, ozone generators are sold as water and air purifiers, and are also used to assist in decontaminating spaces with odors or chemical/biological hazards. The amount of ozone released in a small area may exceed public health standards, compromising indoor air quality. Long-term exposure to ozone can potentially cause harmful health effects such as respiratory illness and decreased ...
Tópico(s): Spectroscopy and Laser Applications
2022 - Elsevier BV | TrAC Trends in Analytical Chemistry
Produção Nacional
Revisado por pares
André L. Fuerback, Cicero da Silveira Postiglione, Claudinor B. Nascimento, Denizar Cruz Martins, Arnaldo J. Perin,
This paper presents a single-stage converter to drive high-intensity discharge metal halide lamps. The integration of two discontinuous conduction mode boost converters, in an interleaved way, with a half-bridge voltage inverter and the use of a square-current waveform applied to the lamp, results in an electronic ballast with high power factor and reduced power spectrum spread, avoiding fluctuations inside the discharge tube. To stabilize the lamp current and power, a feedback control loop was ...
Tópico(s): High voltage insulation and dielectric phenomena
2010 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Industrial Electronics
Produção Nacional
Revisado por pares
Danielle da Silva Sousa, Vanderli Garcia Leal, Gustavo Trindade dos Reis, Sidnei G. Silva, Arnaldo Alves Cardoso, João Flávio da Silveira Petruci,
Air quality monitoring networks are challenging to implement due to the bulkiness and high prices of the standard instruments and the low accuracy of most of the described low-cost approaches. This paper presents a low-cost, automated, self-powered analytical platform to determine the hourly levels of O3 and NO2 in urban atmospheres. Atmospheric air was sampled at a constant airflow of 100 mL min−1 directly into vials containing 800 µL of indigotris sulfonate and the Griess–Saltzman reagent solutions ...
Tópico(s): Gas Sensing Nanomaterials and Sensors
2022 - Multidisciplinary Digital Publishing Institute | Chemosensors