Spiking
Mostrando 1-12 de 190 artigos, teses e dissertações.
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1. Simple Spectrophotometric Determination of Iron in Diesel Oil after Sample Preparation Employing Extraction Induced by Emulsion Breaking
This work reports the development of a simple and fast method for the spectrophotometric determination of Fe in diesel oil using the classic reaction with 1,10-phenanthroline after its extraction induced by emulsion breaking (EIEB). The extraction parameters of EIEB were optimized (concentration of HNO3 and Triton X-100® in the emulsifying solution) as well
Journal of the Brazilian Chemical Society. Publicado em: 2022
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2. Determination of Ethyl Carbamate in Commercial Sweetened Sugar Cane Spirit by ESI-MS/MS Using Modified QuEChERS and 18-Crown-6/Trifluoroacetic Acid Spiking Additives
A fast, sensitive, and selective direct injection electrospray tandem mass spectrometry (DI ESI MS/MS) method that is able to quantify ethyl carbamate in commercial sweetened sugar cane spirit is described. The preparation method uses a modified QuEChERS (quick, easy, cheap, effective, rugged, and safe) with potassium carbonate added to sweetened sugar cane
Journal of the Brazilian Chemical Society. Publicado em: 2022
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3. Correlação e coeficiente de trilha de características fenológicas, componentes de rendimento e de qualidade em trigo
RESUMO Este estudo foi conduzido para caracterizar características fenológicas, componentes do produção e características de qualidade que afetam o rendimento de grãos do trigo. Três genótipos de trigo foram avaliados em três épocas de plantio (20/11, 05/12 e 20/12) e em quatro densidades de semeadura (PS) de 300, 350, 400 e 450 sementes por m2 por
Rev. bras. eng. agríc. ambient.. Publicado em: 2021-09
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4. Oral mucosa lesions as atypical manifestation of adult-onset Still´s disease
Abstract: Adult-onset Still's disease is a systemic inflammatory disorder of unknown etiology, characterized by skin rash, spiking fever, arthralgias or arthritis, and leukocytosis. The typical skin rash is evanescent, salmon-pink, nonpruritic and maculopapular, predominantly on the extremities. It is considered one of the major Yamaguchi's criteria in adult
An. Bras. Dermatol.. Publicado em: 2018-03
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5. Pesticide Residues Method Validation by UPLC-MS/MS for Accreditation Purposes
The development and validation of an analytical method for the determination of 51 pesticides in tomato using UPLC-MS/MS (ultra performance liquid chromatography coupled to tandem mass spectrometry) was performed in order to fulfill the requirements of the NBR ISO/IEC 17025:2005. The goal of the validation was to evaluate all required parameters, such as lin
J. Braz. Chem. Soc.. Publicado em: 2016-06
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6. Copper induction and differential expression of laccase in Aspergillus flavus
Aspergillus flavus was isolated from soil and exhibited laccase activity under both constitutive and copper induced conditions. Spiking the medium with 1 mM copper sulfate resulted in an increase in the activity which reached 51.84 U/mL, a distinctive protein band was detected at 60 kDa. The extracellular enzyme was purified 81 fold using gel filtration chro
Braz. J. Microbiol.. Publicado em: 2015-03
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7. Polymerase chain reaction and nested-PCR approaches for detecting Cryptosporidium in water catchments of water treatment plants in Curitiba, State of Paraná, Brazil
Introduction Cryptosporidium is an important protozoan cause of waterborne disease worldwide of concern to public health authorities. To prevent outbreaks of cryptosporidiosis, the monitoring of this parasite in drinking water is necessary. In the present work, the polymerase chain reaction (PCR) and nested-PCR techniques were used to detect Cryptosporidium
Rev. Soc. Bras. Med. Trop.. Publicado em: 2013-06
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8. The efficiency of concentration methods used to detect enteric viruses in anaerobically digested sludge
The presence of enteric viruses in biosolids can be underestimated due to the inefficient methods (mainly molecular methods) used to recover the viruses from these matrices. Therefore, the goal of this study was to evaluate the different methods used to recover adenoviruses (AdV), rotavirus species A (RVA), norovirus genogroup II (NoV GII) and the hepatitis
Mem. Inst. Oswaldo Cruz. Publicado em: 2013-02
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9. Desenvolvimento de imunossensores piezelétrico e eletroquímico para detecção de amostras de interesse agronômico e de saúde / Desenvolvimento de imunossensores piezelétrico e eletroquímico para detecção de amostras de interesse agronômico e de saúde / Development of piezoelectric and electrochemical immunosensors to detect samples of agronomic interest and public health / Development of piezoelectric and electrochemical immunosensors to detect samples of agronomic interest and public health
This work shows development of immunosensors for agronomic interest and public heath. The first was a piezoeletric immunosensor to detect a cysteine peptidase, a potencial biomarker for Xanthomonas citri subsp. citri that cause a citrus Canker. Another was electrochemical immunosensor based on gold nanoparticles as a label and magnetic beads as capture phase
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/07/2012
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10. MÉTODOS INDIVIDUAL E MULTIRRESIDUAL PARA DETERMINAÇÃO DE PESTICIDAS EM GRÃOS E DERIVADOS POR GC-PFPD, GC-ITD-MS E LC-MS/MS / SINGLE AND MULTI-RESIDUE METHODS FOR PESTICIDE ANALYSIS IN GRAINS AND DERIVATES BY GC-PFPD, GC-ITD-MS AND LC-MS/MS
Due to the complexity of grains like soybean, corn and rice, and the very low pesticide concentration expected for these samples, it is really necessary to develop efficient and reliable analytical methods to identify and quantify their residues. The possibility to perform the determination of a large number of pesticides in just a single chromatographic ana
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/08/2011
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11. Utilização de redes neurais de Spikes para tarefas de navegação de agentes robóticos autônomos
Detectar e prevenir possíveis colisões é um dos aspectos mais importantes na robótica móvel. Esta tarefa, embora aparente facilidade quando executada por seres vivos, mantêm sua dificuldade quando modelada e executada por agentes robóticos autônomos. Além disso, roboticistas e pesquisadores têm sempre encontrado na natureza uma fonte inesgotável d
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/03/2011
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12. Estudos limnológicos e ecotoxicológicos da bacia do Alto Jacaré-Guaçu com ênfase no desenvolvimento de sedimentos artificiais para avaliação da toxicidade do cromo / Limnological and ecotoxicological studies in the Alto Jacaré-Guaçu basin emphasizing the development of artificials sediments to evaluate the chromium toxicity
O presente estudo teve como objetivo avaliar a qualidade dos rios da bacia hidrográfica do Alto Jacaré-Guaçu por meio de análises físicas, químicas, biológicas e ecotoxicológicas. Para tanto foram realizadas quatro amostragens (abril/07; julho/07; outubro/07 e janeiro/08) nos quais foram amostrados água e sedimento em quatorze pontos distribuídos n
Publicado em: 2010