Substitution Processes
Mostrando 1-12 de 181 artigos, teses e dissertações.
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1. APROVEITAMENTO DE PRECURSORES LIGNOCELULÓSICOS PARA PRODUÇÃO DE ACETATO DE CELULOSE
The feasibility of obtaining cellulose acetate from lignocellulosic precursors is of great interest from the environmental, economic and technological points of view. Herein, sugarcane bagasse and vegetable sponge (Luffa cylindrica ) were used as precursors to produce cellulose using the organosolv extraction procedure. From the extracted celluloses, the pro
Quím. Nova. Publicado em: 2020-03
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2. DESAFIO NA ESCOLHA DOS SOLVENTES EM SÍNTESE - O WORKUP COMO EXEMPLO
A procedure for the assessment and optimization of the greenness of solvents in synthesis was developed. It involves two optimization components, aiming at the optimization of both the intrinsic greenness of the solvents and their efficiency to improve the overall green performance of the synthesis, evaluated with mass, energy and time greenness metrics. The
Quím. Nova. Publicado em: 21/10/2019
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3. Physicochemical and technological characteristics of arrowroot flour modified by ultrasound and low-temperature heat treatment
RESUMO: A araruta é uma planta que apresenta conteúdo abundante de amido, e por não apresentar as proteínas do glúten em sua composição desperta o interesse da sua utilização na produção de alimentos para pessoas intolerantes a essas proteínas. A substituição do glúten envolve a utilização de agentes espessantes, como amidos ou farinhas pr�
Cienc. Rural. Publicado em: 03/10/2019
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4. [PROVISIONAL] Role of error-prone DNA polymerases in spontaneous mutagenesis in Caulobacter crescentus
Abstract Spontaneous mutations are important players in evolution. Nevertheless, there is a paucity of information about the mutagenic processes operating in most bacterial species. In this work, we implemented two forward mutational markers for studies in Caulobacter crescentus. We confirmed previous results in which A:T→ G:C transitions are the most prev
Genet. Mol. Biol.. Publicado em: 02/09/2019
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5. Valorização de resíduos de ágata em argamassas e concretos: avaliação do ciclo de vida
RESUMO O uso de resíduos oriundos do processo de beneficiamento de ágata (pó de ágata) em argamassas e concretos de cimento Portland é viável tecnicamente por suas propriedades mecânicas e de durabilidade. Porém, não existem pesquisas que avaliem o perfil ambiental dos materiais produzidos. O presente estudo visa avaliar os impactos ambientais poten
Matéria (Rio J.). Publicado em: 10/06/2019
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6. DFT Study of the Interaction between the Ni2+ and Zn2+ Metal Cations and the 1,2-Dithiolene Ligands: Electronic, Geometric and Energetic Analysis
Density functional theory (DFT) (B3LYP/6-311++G(d,p)) calculations of the interacting strength 1,2-dithiolene anionic ligands with the [M(OH2)4]2+ and [M(OH2)2]2+ complexes (M = Ni and Zn) were performed. Three series of ligands were studied: compounds with an aromatic ring, with an ethylene moiety and with a heterocyclic ring. The ligands have substituents
J. Braz. Chem. Soc.. Publicado em: 23/05/2019
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7. Analysis of phonological processes in the acquisition of complex onset in children with typical phonological development
RESUMO Objetivo: descrever e analisar os processos fonológicos produzidos na aquisição do onset complexo por crianças com desenvolvimento fonológico típico entre 3;0 e 5;11 de idade, estudantes de uma creche-escola municipal pública de Maceió-AL. Métodos: foram incluídas 31 crianças sem comprometimentos auditivos, motores e(ou cognitivos. Os dad
Rev. CEFAC. Publicado em: 08/04/2019
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8. Surface and incorporated liming effects on clay dispersion, water availability, and aeration capacity of a Dystrudept soil
ABSTRACT Liming represents a management procedure that can affect the soil structure and its thermodynamic processes. In this context, the aims of this study were to assess (i) the effects of the surface and incorporated liming on the clay dispersion, soil water availability, and aeration capacity; (ii) the influence of soil chemical alterations in its physi
Bragantia. Publicado em: 05/06/2017
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9. Characterization of biomasses from the north and northeast regions of Brazil for processes in biorefineries
Abstract In search for renewable energy sources, the Brazilian residual biomasses stand out due to their favorable physical and chemical properties, low cost, and their being less pollutant. Therefore, they are likely to be used in biorefineries in the production of chemical inputs to substitute fossil fuels. This substitution is possible due to the high con
Food Sci. Technol. Publicado em: 15/09/2015
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10. Crystallographic Aspects Regarding the Insertion of Ag+ Ions into a Hydroxyapatite Structure
The objective of this study was to evaluate how silver can be inserted into hydroxyapatite (HA) via two distinct processes: co-doping with CO32- via precipitation in an aqueous medium and immersion of preformed HA crystals into Ag+ solutions. It was concluded that although Ag+ and Ca2+ have different radii, the accommodation of Ag+ ions in the Ca2+ sites of
Mat. Res.. Publicado em: 2015-08
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11. Occurrence of Defects in Laser Beam Welded Al-Cu-Li Sheets with T-Joint Configuration
Abstract: In the aerospace industry, laser beam welding has been considered as one of the most promising routes among the new manufacturing processes. Substitution of riveting by laser beam welding of aircraft structures has contributed to weight and cost savings. Concurrently, new aluminum alloys have been developed with the addition of lithium with better
J. Aerosp. Technol. Manag.. Publicado em: 2012-12
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12. Molecular evolution of the ent-kaurenoic acid oxidase gene in Oryzeae
We surveyed the substitution patterns in the ent-kaurenoic acid oxidase (KAO) gene in 11 species of Oryzeae with an outgroup in the Ehrhartoidaea. The synonymous and non-synonymous substitution rates showed a high positive correlation with each other, but were negatively correlated with codon usage bias and GC content at third codon positions. The substituti
Genetics and Molecular Biology. Publicado em: 16/02/2012