Aliquot
Mostrando 1-12 de 131 artigos, teses e dissertações.
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1. Dispersive Solid-Phase Extraction Using 3-Mercaptopropyltrimethoxysilane Functionalized Magnetic MWCNT-Based Nanocomposite for Selective and Efficient Preconcentration of Pb2+ with FAAS Determination
A novel nanocomposite based on magnetic multiwalled carbon nanotubes coated with SiO2 and functionalized with 3-mercaptopropyltrimethoxysilane (3-MPTMS) was prepared for the efficient extraction and quantification of lead ions from water samples. The adsorption capacity of this adsorbent could reach 1.995 mg g-1 Pb2+ in an equilibrium time of 30 min. Under o
Journal of the Brazilian Chemical Society. Publicado em: 2022
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2. Exploring Polypyrrole as Extraction Phase for Disposable Pipette Extraction Method for Multiclass Organic Micro-Pollutant Determination in River and Tap Water Using Gas Chromatography-Mass Spectrometry
The use of a polypyrrole (PPy) is described as an efficient extraction phase for disposable pipette extraction (DPX), in a fast and ruggedized analytical method for simultaneous determination of 18 organic micro-pollutants in water using gas chromatography-mass spectrometry (GC-MS). The DPX-blank pipettes were filled with PPy, a material produced through the
J. Braz. Chem. Soc.. Publicado em: 2020-10
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3. Reforma da Previdência: sustentabilidade e justiça atuarial
Resumo O artigo analisa a proposta de reforma da previdência social feita pelo governo Temer. Investigamos a sustentabilidade financeira do sistema proposto e a sua justiça atuarial. Consideramos as regras contidas na proposta original do governo. Procuramos dar respostas a duas questões relacionadas: (i) qual deveria ser a alíquota de contribuição par
Estud. Econ.. Publicado em: 10/10/2019
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4. Assessment of cytological and biochemical parameters stability in cerebrospinal fluid
RESUMO Objetivo: O objetivo deste estudo foi avaliar a estabilidade, em 12 horas, de parâmetros citológicos e bioquímicos do liquor. Métodos: Amostras de líquido cefalorraquidiano (LCR) foram aliquotadas em cinco diferentes tubos e armazenadas em temperatura ambiente. A primeira alíquota foi imediatamente analisada e as demais, analisadas após 2, 4,
J. Bras. Patol. Med. Lab.. Publicado em: 01/08/2019
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5. An alternative storage method for characterization of the intestinal microbiota through next generation sequencing
ABSTRACT Gut microbiota has been the subject of various molecular studies mainly due to its importance and wide-ranging relationships with human hosts. However, the storage of fecal samples prior to DNA extraction is critical when characterizing the composition of intestinal microbiota. Therefore, we aimed to understand the effects of different fecal storage
Rev. Inst. Med. trop. S. Paulo. Publicado em: 29/11/2018
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6. Fast detection of Mycobacterium tuberculosis in culture-positive sputum samples by nitrate reductase activity
ABSTRACT Microscopy and bacterial culture are the main tools in the diagnosis of tuberculosis. Since the slow growth of Mycobacterium tuberculosis impairs rapid diagnosis strategies, especially in countries where the latter are the only available resources, the ongoing development of new and inexpensive tools based on mycobacterial metabolism optimizing grow
Braz. J. Pharm. Sci.. Publicado em: 14/05/2018
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7. Evaluation of recycled MgO-C bricks and dead-burned dolomite fines in setting slag foaming in the electric arc furnace
Abstract Production cost reduction for the Electric Arc Furnace (EAF) technology is strongly dependent on the efficiency of the electrical energy being introduced into the metal bath. Besides EAF technology, the slag foaming process is currently applied to some other equipment for steel production aiming to save energy, productivity improvements, enhance the
REM, Int. Eng. J.. Publicado em: 2018-03
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8. DETERMINAÇÃO RÁPIDA E SIMULTÂNEA DE PROPIFENAZONA, PARACETAMOL E CAFEÍNA UTILIZANDO ANÁLISE POR INJEÇÃO EM BATELADA COM DETECÇÃO AMPEROMÉTRICA
A fast and simple procedure for simultaneous determination of propyphenazone (PRO), paracetamol (PAR) and caffeine (CAF) was performed using batch injection analysis with multiple pulse amperometric detection (BIA-MPA). Three potentials pulses were selected for the analysis: +0.90 V/50 ms: only PAR was oxidized; +1.20 V/50 ms: oxidation of PAR and PRO withou
Quím. Nova. Publicado em: 2017-10
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9. Antioxidant enzyme profile and lipid peroxidation products in semen samples of testicular germ cell tumor patients submitted to orchiectomy
ABSTRACT Purpose To determine enzymatic antioxidant and lipid peroxidation levels in seminal plasma of patients orchiectomized for testicular tumors. Materials and Methods The study included 52 patients: 26 control men and 26 orchiectomized patients for testicular tumor, of which 12 men had seminoma tumor and 14 men non-seminoma tumor. After semen analys
Int. braz j urol.. Publicado em: 2017-08
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10. Influence of storage time on DNA of Chlamydia trachomatis, Ureaplasma urealyticum, and Neisseria gonorrhoeae for accurate detection by quantitative real-time polymerase chain reaction
The shipment and storage conditions of clinical samples pose a major challenge to the detection accuracy of Chlamydia trachomatis (CT), Neisseria gonorrhoeae (NG), and Ureaplasma urealyticum (UU) when using quantitative real-time polymerase chain reaction (qRT-PCR). The aim of the present study was to explore the influence of storage time at 4°C on the DNA
Braz J Med Biol Res. Publicado em: 25/08/2016
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11. 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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12. Cronologia dos campos de dunas da costa central catarinense e a influência do nível relativo do mar e das mudanças climáticas
RESUMOA formação e estabilização de campos de dunas costeiros têm sido explicadas de maneiras contrárias ao longo das últimas décadas: enquanto alguns autores acreditam que a formação das dunas seria favorecida pelo nível do mar descendente, outros autores defendem que o contexto de nível do mar estável seria mais favorável à sua formação. N
Braz. J. Geol.. Publicado em: 2015-08