Semi Synthesis
Mostrando 1-12 de 115 artigos, teses e dissertações.
-
1. Thermal decomposition and reaction sintering for synthesis of mullite-zirconia composite using kaolin, γ-alumina and zirconia
Abstract The refractory materials used in the wall of the furnaces for glass melting can be prepared from mullite-zirconia composite material. The composite of mullite/zirconia was synthesized from Iraqi kaolin, γ-alumina, and zirconia using thermal decomposition with reaction sintering at 1600 °C. Several batches were prepared with various ratios of kaoli
Cerâmica. Publicado em: 2021-03
-
2. Reordering of Depolymerized Silicates as Adsorbents for Large Nitrogen Compounds
The adsorption capacities of two synthesized zeolites (crystalline ZSM-5 and semi-crystalline faujasite Y) for a mixture of indole, quinoline and carbazole were studied. The different samples obtained show different crystalline degree, mesoporosity and Si/Al ratios. The synthesis procedure is based on the simultaneous depolymerization of a mixture of high su
J. Braz. Chem. Soc.. Publicado em: 2021-01
-
3. Bergenin of Peltophorum dubium (Fabaceae) Roots and Its Bioactive Semi-Synthetic Derivatives
This work describes the isolation of pure bergenin from Peltophorum dubium roots with good yields and its further derivatization through Williamson synthesis. The alkyl derivatives of the bergenin were identified by nuclear magnetic resonance and mass spectrometry data analysis. Among them, three derivatives were reported for the first time herein, 8,10-dihe
J. Braz. Chem. Soc.. Publicado em: 2020-12
-
4. Identifying New Isatin Derivatives with GSK-3β Inhibition Capacity through Molecular Docking and Bioassays
The semi-synthesis of 11 isatin derivatives was achieved through bimolecular nucleophilic substitution and click chemistry. Seven new compounds were obtained. All chemical structures were determined by infrared spectroscopy (IR), nuclear magnetic resonance spectrometry (NMR) and high-resolution mass spectrometry (HRMS) data. These derivatives were evaluated
J. Braz. Chem. Soc.. Publicado em: 2020-03
-
5. Aprendizagem Baseada em Problemas: Contribuição para Médicos Pediatras
RESUMO Introdução A Aprendizagem Baseada em Problemas (ABP) tem se destacado na educação médica por ser uma proposta fundamentada no construtivismo, com a finalidade de desenvolver a autonomia e o raciocínio crítico do estudante para tomada de decisões. Objetivo Por conta das dificuldades encontradas pelos graduandos e das escassas informações
Rev. bras. educ. med.. Publicado em: 13/01/2020
-
6. ATTENTION ON CONTRACEPTION BY FAMILY HEALTH TEAMS: CONVERGENCE OF EDUCATIONAL AND INVESTIGATIONAL PRACTICES
RESUMO Objetivo: construir ações de saúde em conjunto com equipes de Saúde da Família para aperfeiçoar a atenção em anticoncepção. Método: pesquisa qualitativa, na modalidade convergente-assistencial, com suporte teórico-metodológico do Apoio Paideia. Coleta de dados por meio de entrevistas semiestruturadas e grupos de convergência. Participa
Texto contexto - enferm.. Publicado em: 09/12/2019
-
7. GESTIÓN DEL CRECIMIENTO URBANO EN EL FRENTE COSTERO METROPOLITANO Y NUEVAS TERRITORIALIDADES
Resumo No presente trabalho, aborda-se a problemática do processo de gestão da expansão urbana na costa metropolitana de Buenos Aires, a partir da análise do projeto Nueva Costa del Plata (NCdP), empreendimento imobiliário que afeta terras ambientalmente frágeis no litoral sul. Para tanto, assume-se que o principal fator constituindo desta dinâmica es
Mercator (Fortaleza). Publicado em: 09/12/2019
-
8. Síntese de pigmentos de níquel utilizando areia descartada de fundição como fonte de sílica
Resumo Sintetizaram-se pigmentos do sistema Zn2-xNixSiO4 variando a proporção molar de zinco e níquel, partindo da estrutura willemita (Zn2SiO4) à olivina (Ni2SiO4), usando areia descartada de fundição (ADF) e sílica comercial como fontes de SiO2. A ADF foi caracterizada por análise química e DRX. A síntese dos pigmentos seguiu rota cerâmica, com
Cerâmica. Publicado em: 14/11/2019
-
9. Germination and biochemical changes in West Indian gherkin seeds under water stress at different temperatures
RESUMO As informações sobre os efeitos das condições climáticas na sobrevivência de espécies cultivadas em regiões semiáridas são imprescindíveis e, ainda, escassas, principalmente em se tratando de espécies rústicas como o maxixe (Cucumis anguria L.). Com isso, objetivou-se avaliar a germinação, crescimento e alterações bioquímicas em seme
Rev. Ciênc. Agron.. Publicado em: 04/07/2019
-
10. Lupeol and its esters: NMR, powder XRD data and in vitro evaluation of cancer cell growth
ABSTRACT The triterpene lupeol (1) and some of its esters are secondary metabolites produced by species of Celastraceae family, which have being associated with cytotoxic activity. We report herein the isolation of 1, the semi-synthesis of eight lupeol esters and the evaluation of their in vitro activity against nine strains of cancer cells. The reaction of
Braz. J. Pharm. Sci.. Publicado em: 01/02/2018
-
11. Synthesis of New trans-Dehydrocrotonin Nitrogenated Derivatives and their Cytotoxic and DNA-Topoisomerase I Inhibitory Activities
A new series of 19-nor-clerodane diterpene derivatives was synthesized from the natural trans-dehydrocrotonin obtained from stem barks of Croton cajucara (Euphorbiaceae), a native medicinal plant of the Brazilian Amazon. The new derivatives were obtained by changes in the ketone moiety of trans-dehydrocrotonin leading to nitrogenated derivatives which are: t
J. Braz. Chem. Soc.. Publicado em: 2018-01
-
12. Synthesis by Click Reactions and Antiplasmodial Activity of Lupeol 1,2,3-Triazole Derivatives
Lupeol, a triterpene frequently found in Asteraceae plant species, showed moderate to low activity in different strains of Plasmodium falciparum, the most virulent malaria etiological agents. In this work, lupeol was isolated from Parahancornia fasciculata, a plant that is used to treat malaria in the Amazonia region. In the search of more activity lupeol de
J. Braz. Chem. Soc.. Publicado em: 2017-10