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Mostrando ítems 11281-11290 de 33332
Preparação e caracterização de scaffolds a base de polímeros naturais para aplicações biomédicas
(Universidade Federal de Santa MariaBrasilEngenharia QuímicaUFSMPrograma de Pós-Graduação em Engenharia QuímicaCentro de Tecnologia, 2018-04-03)
The present study aims at preparing three-dimensional porous structures, chitosan based scaffolds, that allow the regeneration of the bone tissue simultaneously with the degradation of this material. The scaffolds were ...
Fracionamento da fração sólida obtida na pirólise de resíduos plásticos utilizando destilação molecular de filme descendente
(Universidade Federal de Santa MariaBrasilEngenharia QuímicaUFSMPrograma de Pós-Graduação em Engenharia QuímicaCentro de Tecnologia, 2017-08-29)
The large generation of plastic waste entails the need for recycling methods for the reduction and recovery of these materials. Molecular distillation technology is a viable process to separation high value-added products. ...
Multivariate optimisation of the experimental conditions for determination of three methylxanthines by reversed-phase high-performance liquid chromatography
(2005)
Caffeine (1,3,7-trimethylxanthine), theobromine (3,7-dimethylxanthine) and theophylline (1,3-dimethylxanthine) are the most important naturally occurring methylxanthines. Caffeine is a constituent of coffee and other ...
Simultaneous Determination of Caffeine, Theobromine, and Theophylline by High-Performance Liquid Chromatography
(2002)
This work relates the development of an analytical methodology to simultaneously determine three methylxanthines (caffeine, theobromine, and theophylline) in beverages and urine samples based on reversed-phase high-performance ...
Multi-residue analysis of pesticide residues in mangoes using solid-phase microextraction coupled to liquid chromatography and UV–Vis detection
(2011)
A sensitive and efficient solid-phase microextraction method, based on liquid chromatography and UV–Vis detection, was developed and validated as an alternative method for sample screening prior to LC-MS analysis. It enables ...
Determination of copper in powdered chocolate samples by slurry-sampling flame atomic-absorption spectrometry
(Springer Verlag, 2005)
Chocolate is a complex sample with a high
content of organic compounds and its analysis generally
involves digestion procedures that might include the risk
of losses and/or contamination. The determination of
copper in ...
Development, validation and application of a SDME/GC-FID methodology for the multiresidue determination of organophosphate and pyrethroid pesticides in water
(Elsevier, 2009-10-15)
A single-drop microextraction (SDME) procedure was developed for the analysis of organophosphorus and pyrethroid pesticides in water by gas chromatography (GC) with flame ionization detection (GC-FID). The significant ...
Reducing global disease burden of measles and rubella: Report of the WHO Steering Committee on research related to measles and rubella vaccines and vaccination, 2005
(Vaccine, 2007)
The WHO Steering Committee reviewed and evaluated the progress towards global control of measles and rubella and provided guidelines
for future research activities concerning both diseases during its meeting in New Delhi, ...
Identifying factors impacting the overall accuracy in image classification problems: a statistical approach
(Universidade Tecnológica Federal do Paraná (UTFPR), 2022)
Otimização da condutividade iônica de vitrocerâmicas condutoras por íon sódio: controle microestrutural e busca de novas composições
(Universidade Federal de São CarlosUFSCarPrograma de Pós-Graduação em Ciência e Engenharia de Materiais - PPGCEMCâmpus São Carlos, 2020-04-03)
Sodium-based materials are promising candidates for manufacturing stationary storage devices such as batteries due to their low cost and the Na high redox potential. However, the corrosion, flammability, and the degradation ...