Publicaciones ordenadas por fecha de forma descendente
Lytic Polysaccharide Monooxygenase from Talaromyces amestolkiae with an Enigmatic Linker-like Region: The Role of This Enzyme on Cellulose Saccharification
Autores: Méndez-Líter JA, Ayuso-Fernández I, Csarman F, de Eugenio LI, Míguez N, J. Plou F, Prieto A, Ludwig R and Martínez MJ.
Int. J. Mol. Sci. 2021, 22(24), 13611;
Fecha: DIC 19. 2021.
The first lytic polysaccharide monooxygenase (LPMO) detected in the genome of the widespread ascomycete Talaromyces amestolkiae (TamAA9A) has been successfully expressed in Pichia pastoris and characterized. Molecular modeling of TamAA9A showed a structure similar to those from other AA9 LPMOs. Although fungal LPMOs belonging to the genera Penicillium or Talaromyces have not been analyzed in terms of regioselectivity, phylogenetic analyses suggested C1/C4 oxidation which was confirmed by HPAEC. To ascertain the function [read more]
The bone-degrading enzyme machinery: From multi-component understanding to the treatment of residues from the meat industry
Autores: Fernandez-Lopez, L; Sanchez-Carrillo, S; Garcia-Moyano, A; Borchert, E; Almendral, D; Alonso, S; Cea-Rama, I; Miguez, N; Larsen, O; Werner, J; Makarova, KS; Plou, FJ; Dahlgren, TG; Sanz-Aparicio, J; Hentschel, U; Bjerga, GEK; Ferrer, M
Comp. Struct. Biotechnol. J… vol: 19. page: 2001-0370.
Fecha: . 2021.
Many microorganisms feed on the tissue and recalcitrant bone materials from dead animals, however little is known about the collaborative effort and characteristics of their enzymes. In this study, microbial metagenomes from symbionts of the marine bone-dwelling worm Osedax mucofloris, and from microbial biofilms growing on experimentally deployed bone surfaces were screened for specialized bonedegrading enzymes. [read more]
Efficient nickel and copper-based catalysts supported on modified graphite materials for the hydrogen production from formic acid decomposition
Autores: Faroldi, BM; Conesa, JM; Guerrero-Ruiz, A; Rodriguez-Ramos, I
Appl. Catal. A-Gen.. vol: 629. page: 0926-860X.
Fecha: JAN 5. 2022.
Ni, Cu and Ni-Cu catalysts supported on high surface area graphite were synthesized by incipient wet impregnation. Also, the effect of doping the graphite support with alkali oxides (Li, Na and K) was studied. The catalysts were tested in the formic acid decomposition reaction to produce hydrogen. The bimetallic Ni-Cu catalyst doped with K showed the best catalytic performance with 100% conversion of formic acid at 130 degrees C and a 95% of selectivity to hydrogen. The turnover frequency (TOF) of the [read more]
Editorial overview: Synthetic enzymes: a key tool in sustainable chemistry
Autores: Palomo, JM
Curr. Opin. Green Sustain. Chem.. vol: 32. page: 2452-2236.
Fecha: DEC. 2021.
Facet-dependent stability of near-surface oxygen vacancies and excess charge localization at CeO2 surfaces
Autores: Perez-Bailac, P; Lustemberg, PG; Ganduglia-Pirovano, MV
J. Phys.-Condes. Matter. vol: 33. page: 0953-8984.
Fecha: DEC 15. 2021.
To study the dependence of the relative stability of surface (V ( A )) and subsurface (V-B ) oxygen vacancies with the crystal facet of CeO2, the reduced (100), (110) and (111) surfaces, with two different concentrations of vacancies, were investigated by means of density functional theory (DFT + U) calculations. The results show that the trend in the near-surface vacancy formation energies for comparable vacancy spacings, i.e. (110) < (100) < (111), does not follow the one in the surface stability of the [read more]
Critical review on the use of photocatalysis and photoelectrocatalysis to create antimicrobial surfaces
Autores: Valenzuela, L; Faraldos, M; Bahamonde, A; Rosal, R
Curr. Opin. Chem. Eng.. vol: 34. page: 2211-3398.
Fecha: DEC. 2021.
Infectious diseases are still a major cause of death worldwide. One way of fighting against infectious agents is to develop intrinsically antimicrobial materials to reduce the risk of pathogen spreading through contact with surfaces. Photoactive coatings offer the possibility to produce longlasting antimicrobial surfaces that destroy microorganisms or biofilm matrices due to the production of highly reactive substances when exposed to ultraviolet light or solar radiation. This review reports a selection of recent works using materials deposited on different substrates to act [read more]
Thermo-photo production of hydrogen using ternary Pt-CeO2-TiO2 catalysts: A spectroscopic and mechanistic study
Autores: Caudillo-Flores, U; Barba-Nieto, I; Munoz-Batista, MJ; Meira, DM; Fernandez-Garcia, M; Kubacka, A
Chem. Eng. J.. vol: 425. page: 1385-8947.
Fecha: DEC 1. 2021.
The gas phase thermo-photo production of hydrogen from methanol:water mixtures was tested using platinum ceria-titania ternary solids. This contribution focusses on the analysis of the role of ceria and the usefulness of combining heat and light sources in order to boost catalytic activity. To this end, we provide a quantitative assessment of thermo-photo activity as well as a detailed characterization of the catalytic solids with emphasis in the use of in-situ X-ray absorption and infrared spectroscopies. The adequate [read more]
Influence of the synthesis parameters on the proton exchange membrane fuel cells performance of Fe-N-C aerogel catalysts
Autores: Wang, YL; Larsen, MJ; Rojas, S; Sougrati, MT; Jaouen, F; Ferrer, P; Gianolio, D; Berthon-Fabry, S
J. Power Sources. vol: 514. page: 0378-7753.
Fecha: DEC 1. 2021.
Fe-N-C aerogel catalysts were prepared by sol-gel polycondensation of resorcinol, melamine and formaldehyde precursors in the presence of FeCl3 salt, followed by supercritical drying and thermal treatments. The effect of the mass ratio of precursors on the microstructure, iron speciation and oxygen reduction reaction (ORR) performance of the Fe-N-C aerogels was investigated by N-2 sorption, scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, Mossbauer spectroscopy, X-ray absorption spectroscopy, CO chemisorption and rotating disk electrode [read more]
beta-Galactosidase from Kluyveromyces lactis: Characterization, production, immobilization and applications- A review
Autores: de Albuquerque, TLD; de Sousa, M; Silva, NCGE; Girao Neto, CAC; Gonsalves, LRB; Fernandez-Lafuente, R; Rocha, MVP
Int. J. Biol. Macromol.. vol: 191. page: 0141-8130.
Fecha: nov-30. 2021.
A review on the enzyme beta-galactosidase from Kluyveromyces lactis is presented, from the perspective of its structure and mechanisms of action, the main catalyzed reactions, the key factors influencing its activity, and selectivity, as well as the main techniques used for improving the biocatalyst functionality. Particular attention was given to the discussion of hydrolysis, transglycosylation, and galactosylation reactions, which are commonly mediated by this enzyme. In addition, the products generated from these processes [read more]
Carbon nanodot-based electrogenerated chemiluminescence biosensor for miRNA-21 detection
Autores: Gutierrez-Galvez, L; Garcia-Mendiola, T; Gutierrez-Sanchez, C; Guerrero-Esteban, T; Garcia-Diego, C; Buendia, I; Garcia-Bermejo, ML; Pariente, F; Lorenzo, E
Microchim. Acta. vol: 188. page: 0026-3672.
Fecha: NOV. 2021.
A simple carbon nanodot-based electrogenerated chemiluminescence biosensor is described for sensitive and selective detection of microRNA-21 (miRNA-21), a biomarker of several pathologies including cardiovascular diseases (CVDs). The photoluminescent carbon nanodots (CNDs) were obtained using a new synthesis method, simply by treating tiger nut milk in a microwave reactor. The synthesis is environmentally friendly, simple, and efficient. The optical properties and morphological characteristics of the CNDs were exhaustively investigated, confirming that they have oxygen and [read more]
Graphene oxide activates B cells with upregulation of granzyme B expression: evidence at the single-cell level for its immune-modulatory properties and anticancer activity
Autores: Orecchioni, M; Fusco, L; Mall, R; Bordoni, V; Fuoco, C; Rinchai, D; Guo, S; Sainz, R; Zoccheddu, M; Gurcan, C; Yilmazer, A; Zavan, B; Menard-Moyon, C; Bianco, A; Hendrickx, W; Bedognetti, D; Delogu, LG
Artículo; Early Access.
Nanoscale. vol: . page: 2040-3364.
Fecha: . .
We recently found by single-cell mass cytometry that ex vivo human B cells internalize graphene oxide (GO). The functional impact of such uptake on B cells remains unexplored. Here, we disclosed the effects of GO and amino-functionalized GO (GONH(2)) interacting with human B cells in vitro and ex vivo at the protein and gene expression levels. Moreover, [read more]
Catalysts of ceria supported on copper-chromium oxide: Ceria promotion of the CO-PROX activity
Autores: Elmhamdi, A; Pascual, L; Retuerto, M; Martinez-Arias, A
Int. J. Hydrog. Energy. vol: 46. page: 0360-3199.
Fecha: nov-11. 2021.
A copper-chromium mixed oxide with Cu:Cr 1:2 ratio has been prepared by a micro emulsion method and employed as support of CeO2 in different amounts from 5 to 80 wt%. The catalysts have been characterized by XRD, HRTEM/XEDS, H2-TPR and XPS. The characterization results have been examined in correlation with their catalytic properties for the CO-PROX process complemented by operando-DRIFTS. The catalysts are formed by composites of CuCr2O4 and CuO on which aggregates of CeO2 nanoparticles are dispersed. Incorporation of CeO2 onto [read more]
Functional Characterisation of Bile Metagenome: Study of Metagenomic Dark Matter
Autores: Sabater, C; Molinero, N; Ferrer, M; Bernardo, CMG; Delgado, S; Margolles, A
Microorganisms. vol: 9. page: .
Fecha: NOV. 2021.
Gallbladder metagenome involves a wide range of unidentified sequences comprising the so-called metagenomic dark matter. Therefore, this study aimed to characterise three gallbladder metagenomes and a fosmid library with an emphasis on metagenomic dark matter fraction. For this purpose, a novel data analysis strategy based on the combination of remote homology and molecular modelling has been proposed. According to the results obtained, several protein functional domains were annotated in the metagenomic dark matter fraction including acetyltransferases, outer membrane transporter proteins, membrane [read more]
Autores: Palomo, JM; Galan, MC; Garcia-Fernandez, JM
Nanomaterials. vol: 11. page: .
Fecha: OCT. 2021.
Pt/B-g-C3N4 catalysts for hydrogen photo-production: Activity interpretation through a spectroscopic and intrinsic kinetic analysis
Autores: Caudillo-Flores, U; Barba-Nieto, I; Gomez-Cerezo, MN; Rodriguez-Castellon, E; Fernandez-Garcia, M; Kubacka, A
J. Environ. Chem. Eng.. vol: 9. page: .
Fecha: OCT. 2021.
Carbon nitride based materials doped with boron were used as support to deposit platinum. The systems were tested in the photo-production of hydrogen using methanol as a sacrificial molecule. Tests under UV and sunlight-type illumination conditions showed an important promoting effect of boron, irrespective of the illumination nature. The measurement of the quantum efficiency was used to assess quantitatively the performance of the catalysts. The outstanding properties of the solids, particularly using sunlight as an energy source of [read more]