Results 11 to 20 of about 8,205 (244)

Crosslinked Poly(HEMA)–Based Cellulose Nanocrystal Contact Lenses: Polymer Structure and Nanoparticle Lixiviation

International Journal of Polymer Science
Poly(HEMA)-based materials are widely used in medical devices, with well-established applications in soft contact lenses (CLs). Owing to their simplicity and the extensive literature available, poly(HEMA) derivatives—particularly crosslinked HEMA:EGDMA ...
Arthur Spilit, Syed Ali Faran, Alain Dufresne, Laurence Fitzhenry, Marcos Mariano   +4 more
doaj   +2 more sources

From Green to Brown: Characterization of the Fast Alteration of Modern Greenish Enamels in Glass Windows. [PDF]

Chempluschem
Spots and stains appeared on the modern green enamel from different stained‐glass windows as a consequence of environmental alteration. The multianalytical characterization showed a 3‐step alteration mechanism divided into Pb2+ lixiviation from the enamel, formation of hydrocerussite (2PbCO3·Pb(OH)2), and transformation into scrutinyite (α‐PbO2) and ...
Palomar T, Calatayud DG, Oujja M, Maestro-Guijarro L, Aparicio M, Mosa J, Koppermann B, Seliger L.   +7 more
europepmc   +2 more sources

Novel Graphitic Oxynitrides as Photocatalysts for Sustainable H₂ Production and CO₂ Valorization. The Importance of Self-Assembly for Catalytic Activity. [PDF]

ChemSusChem
A novel subclass of graphitic oxynitrides, easily generated from otherwise abundant prebiotic monomers, namely cyanamide and glyoxal, debut in the scenario of sustainable heterogeneous catalysts, as demonstrated through applications to the highly demanding H2 and CO2 agendas.
Lavado N, Pardo-Botello R, María Sánchez-Rodas J, Fernando Martínez R, Montes V, Javier López-Tenllado F, Cintas P, Babiano R.   +7 more
europepmc   +2 more sources

Geochemistry of a spheroidal weathering profile in a tropical mountainous landscape, Rio de Janeiro, Brazil

Anais da Academia Brasileira de Ciências, 2022
Boulders are an important material in debris flow and their source is coupled with spheroidal weathering profiles that produce corestones. The goal of this work was to establish the geochemical transformations that produced corestones and distinguished ...
CARLA S. SILVEIRA, JULIANA G. RODRIGUES, DENISE R. ARARIPE, ALFREDO V.B. BERNEDO, JOSÉ L. MANTOVANO   +4 more
doaj   +1 more source

Controlling Selectivity at the First Hydrogenation Level: Synthesis of 3-Hydroxyisoindolines by Heterogeneously Silver-Catalyzed Monohydrogenation of Phthalimides. [PDF]

Adv Sci (Weinh)
3‐Hydroxylactams are obtained from phthalimides through a heterogeneous catalyzed chemoselective hydrogenation, able to stop the process at the first hydrogenation level. By using a rationally designed [Ag/Al2O3] recyclable solid nanocatalyst, a wide range of cyclic hemiamidals are accesed through a full atom‐economical reaction that preserves (hetero ...
Lluna-Galán C, Adam R, Cabrero-Antonino JR.   +2 more
europepmc   +2 more sources

Semicontinuous Lixiviation Process for Compound Extraction from Cannabis sativa grown in Colombia

Ingeniería e Investigación, 2021
The extraction of compounds present in Cannabis sativa biomass from Colombian crops was studied using a semi-continuous lixiviation process. To this effect, three extraction stages were implemented, in which successive transfers were carried out at fixed
Oscar Yecid Buitrago Suescún, Miguel Augusto Santaella Serrano   +1 more
doaj   +1 more source

Chlorophylls and β-carotene in Spirulina platensis Dietary Supplements: Nano Liquid Chromatography Versus Diffuse Reflectance Spectroscopy for Establishing Composition, Quality Control, and Comparison of Commercial Products. [PDF]

J Sep Sci
ABSTRACT Spirulina is considered a superfood due to its chlorophylls. Two new methods for the determination of chlorophylls and β‐carotene were developed here, one based on in‐tube solid‐phase microextraction (IT‐SPME) coupled online to nanoliquid chromatography (nanoLC) with diode array detection (DAD), and the other on ultraviolet‐visible diffuse ...
Soto C, Herráez-Hernández R, Campíns-Falcó P.   +2 more
europepmc   +2 more sources

Adubação Nitrogenada em Pastagem de Triticale mais Azevém sob Pastejo com Lotação Contínua: Recuperação de Nitrogênio e Eficiência na Produção de Forragem Nitrogen Fertilization on Triticale plus Italian Ryegrass Pasture under Continuous Stocking: Nitrogen Recovery and Forage Production Efficiency

Revista Brasileira de Zootecnia, 2002
O objetivo do experimento foi avaliar a eficiência da adubação nitrogenada na forma de uréia, em pastagem de triticale mais azevém, submetida a pastejo com lotação contínua. Foram usados quatro níveis de nitrogênio em cobertura: 0, 150, 300 e 450 kg N/ha,
André Brugnara Soares, João Restle
doaj   +1 more source

Direct extraction of oil from sunflower seeds by twin-screw extruder according to an aqueous extraction process: Feasibility study and influence of operating conditions [PDF]

, 2007
The objective of this study was to evaluate the feasibility of an aqueous process to extract sunflower seed oil using a co-rotating twin-screw extruder. Aqueous extraction was carried out using whole seeds and the influence of the operating conditions on
Amalia Kartika, Amalia Kartika, Bligh, Choudhury, Domínguez, Domínguez, Dziezak, Fullbrook, Galvin, Gautam, Gautam, Gogoi, Hagenmaier, Isobe, L. Rigal, Lacaze-Dufaure, Lacaze-Dufaure, Lanzani, P.Y. Pontalier, Ph. Evon, Rigal, Rosenthal, Sineiro, Southwell, V. Vandenbossche, Van Soest, Van Soest   +26 more
core   +4 more sources

Hybrid Material Based on an Amorphous-Carbon Matrix and ZnO/Zn for the Solar Photocatalytic Degradation of Basic Blue 41

Molecules, 2019
Innovative composites based on an amorphous-carbon matrix containing a second phase ZnO oxide and/or highly dispersed Zn metallic were synthesized via a modified Pechini route, in which a partial pyrolysis method was reached. Studies of adsorption in the
Silvania Lanfredi, Marcos A. L. Nobre, Po S. Poon, Juan Matos   +3 more
doaj   +1 more source