Results 21 to 30 of about 432,216 (161)

Una opción para la investigación en empresas. Maestría en Química Inorgánica de la república de Cuba

Educación Química, 2018
En el trabajo se presenta una breve caracterización del programa nacional de la maestría en Química Inorgánica de la República de Cuba. Mediante ejemplos se demuestra la posibilidad de formar personal calificado en Inorgánica Preparativa y Química ...
Luis Alberto Bello Pauli, Luis Javier Fiffe Maguercia, Raquel María Acosta Chávez   +2 more
doaj   +1 more source

Influence of Oxidation State on the Catalytic Activity of Iron Catalysts for CO₂ Fixation to Cyclic Carbonates. [PDF]

ChemSusChem
Air stable bimetallic iron one‐component systems capable of CO2 cycloaddition to epoxides under 1 bar of pressure of CO2. In this work, one‐component iron catalysts for the atom‐economical reaction of CO2 with epoxides have been used as efficient catalysts for the carbon dioxide cycloaddition into cyclic carbonates in excellent yields.
Caballero MP, Navarro M, Buchaca MMS, Naranjo J, Moreno-Fernandez A, Rodríguez-Diéguez A, Salcedo-Abraira P, Castro-Osma JA, Tejeda J, Cruz-Martínez F, Lara-Sánchez A.   +10 more
europepmc   +2 more sources

Studies of some effects on the preparation of spherical silica particles from reverse microemulsion

Eclética Química, 2018
Silica spherical particles were prepared in reverse microemulsion from sodium silicate solution precursor. Particle shape and size changes were investigated in function of reactants addition order, sodium silicate solution concentration and water to ...
Juliana Flor, Marian Rosaly Davolos, Miguel Jafelicci Júnior   +2 more
doaj   +1 more source

MAGNETIC NANOPARTICLES: THE COBALT

Eclética Química, 2018
The development of nanoparticles has been intensively pursued because of their technological importance. The magnetic nanoparticulate materials exhibit a series of interesting properties between which are mentioned the electrical, optical, magnetic and ...
Vagner Sargentelli, Antonio P. Ferreira
doaj   +1 more source

Pyridinium Cations Act as Charge Reservoirs in Expanded Halide Perovskite Analogs at High Pressure

Angewandte Chemie, EarlyView.
Redox‐innocent pyridinium derivatives can act as charge reservoirs in expanded tin‐iodide perovskite analogs. Material compression reduces the energy gap between the pyridinium π* acceptor orbital and the valence‐band maximum, facilitating electron transfer from the framework to the molecules and thereby significantly increasing electronic conductivity
Christina R. Deschene, Feng Ke, Kostas Fykouras, Alexander C. Su, Yu Lin, Linn Leppert, Hemamala I. Karunadasa, Roc Matheu   +7 more
wiley   +2 more sources

HPLC Quantification of Cytotoxic Compounds from Aspergillus niger

Journal of Chemistry, 2017
A high-performance liquid chromatography method was developed and validated for the quantification of the cytotoxic compounds produced by a marine strain of Aspergillus niger.
Paula Karina S. Uchoa, Leandro Bezerra de Lima, Antonia T. A. Pimenta, Maria da Conceição F. de Oliveira, Jair Mafezoli, Mary Anne S. Lima   +5 more
doaj   +1 more source

Acceptor‐Doped Cerium Oxides Enabling Metallic Nanocatalyst Exsolution for Hydrogen Production From Ammonia

Angewandte Chemie, EarlyView.
Outstanding catalytic results for NH3 decomposition for H2 production were obtained with metallic Ru, Rh, and RuRh nanoparticle‐exsolved CeO2‐based catalysts. Significant lower amounts of available superficial metallic fractions were needed in comparison to conventional Ru‐impregnated materials.
Andrés López‐García, Elena Barrio‐Querol, Álvaro Represa, Jesús Ara, Ana B. Hungría, David Catalán‐Martínez, Alfonso J. Carrillo, Sonia Escolástico, José Manuel Serra   +8 more
wiley   +2 more sources

Unraveling A4GALT Mechanism and Its Modulation With Adamantyl‐Galactosylceramide Analogues: Advancing Fabry Disease Therapeutic Strategies

Angewandte Chemie, EarlyView.
A 310‐helix‐mediated conformational switch promotes a front‐face SNi‐like catalysis by human A4GALT. Mechanism‐guided design identifies AdaGalCer as a selective modulator of globotriaosylceramide (Gb3) biosynthesis, opening a clear route toward new Fabry disease therapeutics.
Nicky de Koster, Òscar Vidal‐Gironès, Rowan de Graaf, Ken Kok, Lindsey T. Lelieveld, Jackelien Hoogervorst, Maria J. Ferraz, José Pablo Rivas‐Fernández, Rob F. Lammers, Herman S. Overkleeft, Johannes M. F. G. Aerts, Rolf G. Boot, Carme Rovira, Marta Artola   +13 more
wiley   +2 more sources

Estudio longitudinal sobre la construcción de conceptos Enlace, solubilidad y conductividad

Educación Química, 2018
La finalidad central de este estudio se orienta hacia la búsqueda de las concepciones previas de los estudiantes de licenciatura en Química de la Facultad de Química de la UNAM, acerca de conceptos cuya adquisición resulta indispensable para comprender ...
Ana E. Domínguez, Fernando Flores C., Leticia Gallegos Cázares, Marta Rodríguez   +3 more
doaj   +1 more source

Larvicidal Activity against Aedes Aegypti L. (Diptera: Culicidae) of Essential Oils of from Brazil

Natural Product Communications, 2006
The larvicidal activity of the essential oils from leaves of five species of Lippia (L. alba, L. aff. gracilis, L. gracilis, L. microphylla and L. nodiflora) was studied on third instar larvae of Aedes aegypti.
Gilvandete M. P. Santiago, Telma L. G. Lemos, Otília D. L. Pessoa, Ângela M. C. Arriaga, Francisco J. A. Matos, Mary Anne S. Lima, Hélcio S. Santos, Maria da Conceição L. Lima, Francisco G. Barbosa, João H. S. Luciano, Edilberto R. Silveira, Gustavo H. A. de Menezes   +11 more
doaj   +1 more source