EEG gamma band alterations and REM-like traits underpin the acute effect of the atypical psychedelic ibogaine in the Rat ]]> Ibogaine is a psychedelic alkaloid that has attracted large
scientific interest because of its antiaddictive properties in observational studies in humans as well as in animal models. Its subjective effect has been described as intense, vivid dream-like experiences occurring while awake; hence, ibogaine is often referred to as an oneirogenic psychedelic. While this unique dream-like profile has been hypothesized to aid the antiaddictive effects, the electrophysiological signatures of this
psychedelic state remain unknown. We previously showed in rats that ibogaine promotes a waking state with abnormal motor behavior along with a decrease in NREM and REM sleep. Here, we performed an indepth analysis of the intracranial electroencephalogram during “ibogaine wakefulness”. We found that ibogaine induces gamma oscillations that, despite having larger power than control levels, are less coherent and less complex. Further analysis revealed that this profile of gamma activity compares to that of natural REM sleep. Thus, our results provide novel biological evidence for the association between the psychedelic state and REM sleep, contributing to the understanding of the brain mechanisms associated with the oneirogenic psychedelic effect of ibogaine.

]]> González Arbildi, Joaquín]]> Cavelli, Matias]]> Castro Zaballa, Santiago]]> Mondino, Alejandra]]> Tort, Alejandro B. L.]]> Rubido, Nicolás]]> Carrera, Ignacio]]> Torterolo Minetti, Pablo Daniel]]> American Chemical Society]]> Información sobre Derechos de Autor

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La legislación uruguaya protege el derechode autor sobre toda creación literaria, científica o artística, tanto en lo que tiene que ver con sus derechos morales, como en lo referente a los derechos patrimoniales con sujeción a lo establecido por el derecho común y las siguientes leyes (LEY 9.739 DE 17 DE DICIEMBRE DE 1937 SOBRE PROPIEDAD LITERARIA Y ARTISTICA CON LAS MODIFICACIONES INTRODUCIDAS POR LA LEY DE DERECHO DE AUTOR Y DERECHOS CONEXOS No. 17.616 DE 10 DE ENERO DE 2003, LEY 17.805 DE 26 DE AGOSTO DE 2004, LEY 18.046 DE 24 DE OCTUBRE DE 2006 LEY 18.046 DE 24 DE OCTUBRE DE 2006)

]]> 10.1021/acsptsci.0c00164 ]]> Detection of SOF2 and SO2F2 through aluminium nitride nanosheets: a DFT study]]> Detection of sulfuryl fluoride (SO2F2) and thionyl fluoride (SOF2) can be used to find out the degradation of sulfur hexafluoride (SF6), indicating gas insulation switchgear equipment failures. In the present work, we study through first-principle DFT calculations the SOF2 and SO2F2 adsorption on aluminium nitride nanosheets (AlNNS), with the aim of to evaluate the performance of this nanomaterial as gas sensor. First, we performed an energetic, geometric and bonding analysis, obtaining considerable adsorption energy values for SO2F2 and SOF2 (−1.63 and −1.93 eV, respectively), which suggests these gases are chemisorbed on the AlN surface.
Furthermore, certain SeF bonds were broken during adsorption, while new AleF and SeN overlaps were developed. Simultaneously, an important weakening was observed for AleN bonds close to the adsorption site. The adsorption selectivity of AlNNS toward SO2F2 and SOF2 was also studied, noting that other molecules normally present in air show a lower reactivity.
Band structure and electronic density of states were realized in order to evaluate the sensing capacity of AlNNS surface. The obtained plots show a notorious narrowing of the band gap after gas adsorption, particularly in the case of SOF2, so an important change in the conductivity of AlNNS could be expected during gas exposition. Charge density analysis reveals an important charge transfer from AlNNS to both adsorbed gases, which suggest that this nanomaterial could behave as an n-type semiconductor. These results seem to indicate that
AlNNS could act with good sensibility and selectivity for SOF2 and SO2F2 detection, showing high potential as gas sensing material.

]]> González Fá, Alejandro J.]]> Faccio, Ricardo]]> López Corral, I.]]> Información sobre Derechos de Autor

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ADVERTENCIA: La consulta de este documento queda condicionada a la aceptación de las siguientes condiciones de uso: Este documento es únicamente para usos privados enmarcados en actividades de investigación y docencia. No se autoriza su reproducción con fines de lucro. Esta reserva de derechos afecta tanto los datos del documento como a sus contenidos. En la utilización o cita de partes debe indicarse el nombre de la persona autora.]]> 10.1016/j.apsusc.2020.147899 ]]> C–doped TiO2(B): a density functional theory characterization]]> Calculations based on the Density Functional Theory (DFT) were applied to study structural, electronic and optical properties of pure and C–doped TiO2(B) taking into account five different types of substitutional impurities. Our calculations indicate that the substitution of a C atom at an O site (C@O) is not only thermodynamically more favorable, but also independent of the growing conditions. The presence of impurity states in the
band gap, along with a great reduction of the gap energy (Eg) were obtained after C@O doping, which leads to an
enhancement of the absorbance in the visible and IR spectrum caused partially by trapped holes and electrons that the introduction of the impurity induces. Additionally, our results showed that the substitution of a C atom at a Ti site (C@Ti) originated a significant change not only in the structural arrangement of the neighborhood of the impurity, but also on its electronic and optical behavior compared to the pure TiO2(B) model.

]]> Heffner, Herman
]]> Faccio, Ricardo]]> López Corral, Ignacio]]> Información sobre Derechos de Autor

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ADVERTENCIA: La consulta de este documento queda condicionada a la aceptación de las siguientes condiciones de uso: Este documento es únicamente para usos privados enmarcados en actividades de investigación y docencia. No se autoriza su reproducción con fines de lucro. Esta reserva de derechos afecta tanto los datos del documento como a sus contenidos. En la utilización o cita de partes debe indicarse el nombre de la persona autora.]]> 10.1016/j.apsusc.2021.149479 ]]> Adsorption of organic molecules on graphene and fluorographene: an unresolved discrepancy between experiment and theory]]> Herein, we studied the adsorption of 15 organic and three polar molecules onto pristine and fluorinated graphene. Two levels of fluorination were selected, CF fluorographene for which all carbon atoms are fluorinated and C4F fluorinated graphene, which maximizes the number of Clar sextets. Five different density functionals were employed: M06-L, M06-2X, PBE-D2 and PBE-D3BJ. In contrast with recent experimental investigations, we found that the adsorption energies for organic molecules onto perfect graphene are significantly lower than those determined for fluorographene. This situation is exacerbated when enthalpic and free energy corrections are included. However, a different scenario was found for polar molecules such as H2O, H2O2 and HF. Partial fluorination following a C4F pattern leads to significantly lower adsorption energies for these three molecules, and the superhydrophilicity
of C4F is maintained after thermodynamic corrections are included. In fact, even the removal of a single fluorine atom results in a dramatic change in the adsorption energy of water on fluorographene. We discuss the performance of the
density functionals assayed and the importance of using finite and infinite models. This work demonstrates that it is possible to adjust the adsorption energy of a given polar molecule onto graphene by controlling the fluorination level and in doing so,
that partially fluorinated graphene models may open new avenues for the separation of molecules with different polarity.

]]> Iribarne, Federico]]> Denis, Pablo A.]]> Información sobre Derechos de Autor

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ADVERTENCIA: La consulta de este documento queda condicionada a la aceptación de las siguientes condiciones de uso: Este documento es únicamente para usos privados enmarcados en actividades de investigación y docencia. No se autoriza su reproducción con fines de lucro. Esta reserva de derechos afecta tanto los datos del documento como a sus contenidos. En la utilización o cita de partes debe indicarse el nombre de la persona autora.]]> 10.1002/qua.26605 ]]> Thermodynamic functions and vibrational properties of Li intercalation in TiO2(B)]]> In this work, Li doped TiO2(B) was modelled throughout the implementation of density functional theory with Hubbard methodology (DFT + U) in order to understand its vibrational and thermodynamics properties. Firstly, we performed structural, electronic structure and charge density difference studies in order to find accurately modelled systems. The electronic structure analysis shows that the lithiated systems have a metallic character and a n-type behavior, also the asymmetric DOS reveals that a small induced magnetic moment is present. The charge density difference analysis confirmed that the charge transfer is from the Li to the oxide. The vibrational properties studies present the undiscovered irreducible representation of the Li-TiO2(B) systems and its phononic densities. Moreover, the Raman spectroscopy studies of the bulk show great correspondence with experimental
literature and the novel spectra obtained of the doped systems show a dispersion and displacement of the peaks.
Additionally, the thermodynamic properties studies show evidence that both doped systems show promising features. Therefore, the results obtained here are innovative and can be used as reference connected with future experimental studies of this material, which has potential to be employed as a Li-ion battery anode.

]]> Fernández Werner, Luciana]]> Bechthold, P.]]> Jiménez, M. J.]]> Jasen, P. V.]]> Faccio, Ricardo]]> Gonzalez, E. A.]]> Información sobre Derechos de Autor

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]]> Klein, Florencia]]> Barrera, Exequiel E]]> Pantano, Sergio]]> American Chemical Society]]> Información sobre Derechos de Autor

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]]> 10.1016/j.poly.2021.115406 ]]> Application of high hydrostatic pressure for the reduction of STEC on raw ground beef patties and its impact on physicochemical properties: pH and color]]> This study on raw ground beef patties evaluated: resistance of STEC strains inoculated at 6 log CFU/g (O157:H7, O26, O45, O103, O111, O121, and O145) subjected to 350, 450 and 600 MPa, for 5 min at 10 ◦C; effectiveness of pressure for initial loads (2, 3 and 4 log CFU/g) of O157:H7; and general impact of high hydrostatic pressure (HHP) on raw patties. For 600 MPa treatments and 6 log CFU/g load of STEC, ~5 log CFU/g reductions were obtained with all strains. For 450 MPa, differences in baroresistance among strains became evident. When inoculating O157:H7 at different loads, counts after 600 MPa fell below quantification limits, though virulence genes were detected for the two highest loads. Additionally, HHP reduced native aerobic microbiota to <1 log CFU/g and slightly affected a* and b* color values. Montecarlo simulation was used to estimate potential initial counts of STEC that allow compliance with existing regulatory limits after applying HHP, showing that absence of STEC studied can be achieved in 65 g of patties provided initial loads are ~2 log CFU/g. Finally, HHP
treatments at 600 MPa and mild temperatures can be considered a valid non-thermal processing technology to
achieve 5 log CFU/g reductions.

]]> Martínez Barnié, Inés]]> Mussio, Paula]]> Jorcin, Santiago]]> Rajchman, Mikaela]]> López Pedemonte, Tomás]]> Información sobre Derechos de Autor

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]]> 10.1016/j.lwt.2021.112126 ]]> Development of tropical mixed juice with low added-sugar content: sensory and nutritional aspects]]> The aim of the present study was to develop a mixed tropical fruit juice of cashew apple, acerola and melon with low added-sugar content considering sensory and nutritional aspects. Five formulations were developed varying the concentration of the different fruits. A total of 172 consumers rated their overall liking using a 9-point hedonic scale and described their sensory characteristics using a Check-all-that-apply question. In addition, the functional properties of the juices were evaluated by analyzing vitamin C, total phenolic compounds and antioxidant capacity. Results showed that the addition of sugar and fruit composition affected the sensory characteristics and consumer liking of the formulations. Samples without added sugar and with higher melon concentration showed lower liking scores (p<0.05). In addition, the highest concentration of acerola had a positive effect on nutritional characteristics. The formulation with 50% of fruit pulp (60% of cashew apple,
30% of acerola and 10% of melon), 47% of water, and 3% of added sugar achieved the best results. The effect of aroma on sweetness perception was investigated by adding identical to natural aromas of melon, apple and pineapple to the selected formulation. However, aroma did not significantly modify sweetness perception, evaluated using a rate-all-that-apply question.

]]> Araujo Martins, Inayara Beatriz]]> Carvalho Costa Barbosa, Isadora de]]> Rosenthal, Amauri]]> Ares, Gastón]]> Deliza, Rosires]]> Información sobre Derechos de Autor

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]]> 10.1177/10820132211020844 ]]> Purification of protein from Arthrospira platensis using aqueous two-phase system associate with membrane separation process and evaluation of functional properties ]]> Arthrospira platensis has stood out, especially due to its high protein content and its potential for food application. However,
the exploration of protein concentration techniques of this microalgae still presents a great challenge. Thus, the objective
of this study was to evaluate the purification of A. platensis proteins by applying two different aqueous two-phase systems
(ATS) composed of potassium phosphate and ethanol, and sodium citrate and ethanol, in addition to the association with
membrane separation process (MSP), and the characterization of the fractions obtained. ATS under the optimised conditions
(19% potassium phosphate and 30% ethanol, and 19.5% sodium citrate and 29% ethanol) resulted in 1.27 and 1.31 purity, and 77.45% and 78% recovery, respectively. The sodium citrate and ethanol ATS showed significantly greater purity; thus, the upper phase was submitted to MSP. The association of ATS and MSP increased the recovery (~ 87%) and the purity (1.5). The top phase of ATS showed higher protein content (61%) than the bottom (5.9%), confirming the protein preference to the top. When the MSP was evaluated, the protein was increased about 8.0%, and antioxidant activity was kept (42 and 40% to top phase and ATS/MSP concentrate, respectively). Emulsions formed by ATS top phase showed a lower droplet size (33.69 μm D4.3 and 6.02 μm D3.2), and a significantly lower degree of overall destabilization (0.04 × 10–
6 s−1 kh and 3.54 × 10–3 s−1 ks) than those stabilized with bottom phase and MSP/ATS concentrate. ATS associated with membrane process showed efficiency in the concentration A. platensis protein, being able to be an alternative to be used in industrial systems.

]]> Lupatini Menegotto, Anne Luize]]> Fernandes, Ilizandra Aparecida]]> Bucior, Danieli]]> Pinto Balestieri, Bianca]]> Colla, Luciane Maria]]> Abirached, Cecilia]]> Franeschi, Elton]]> Steffens, Juliana]]> Valduga, Eunice]]> Información sobre Derechos de Autor

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]]> 10.1007/s10811-021-02505-0 ]]> Ultrastructural characterization of the tegument in protoscoleces of Echinococcus ortleppi ]]> Cystic echinococcosis is a globally distributed zoonosis caused by cestodes of the Echinococcus granulosus sensu lato (s.l.) complex, with Echinococcus ortleppi mainly involved in cattle infection. Protoscoleces show high developmental plasticity, being able to differentiate into either adult worms or metacestodes within definitive or intermediate hosts, respectively. Their outermost cellular layer is called the tegument, which is important in determining the infection outcome through its immunomodulating activities. Herein, we
report an in-depth characterization of the tegument of E. ortleppi protoscoleces performed through a combination of scanning and transmission electron microscopy techniques. Using electron tomography, a three-dimensional reconstruction of the tegumental cellular territories was obtained, revealing a novel structure termed the ‘tegumental vesicular body’ (TVB). Vesicle-like structures, possibly involved in endocytic/exocytic routes, were found within the TVB as well as in the parasite glycocalyx, distal cytoplasm and close inner structures. Furthermore, parasite antigens (GST-1 and AgB) were unevenly localised within tegumental structures, with both being detected in vesicles found within the TBV. Finally, the presence of host (bovine) IgG was also assessed, suggesting a possible endocytic route in protoscoleces. Our data forms the basis for a better understanding of E. ortleppi and E. granulosus s.l. structural biology.

]]> Miles, Sebastián]]> Magnone, Javier]]> García Luna, Joaquín]]> Ancarola, María Eugenia]]> Cucher, Marcela]]> Dematteis, Sylvia]]> Frischknecht, Friedrich]]> Cyrklaff, Marek]]> Mourglia Ettlin, Gustavo]]> Información sobre Derechos de Autor

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]]> 10.1016/j.ijpara.2021.05.004 ]]> Relationship between Baccharis dracunculifolia DC. and B. microdonta DC. (Asteraceae) by Their Different Seasonal Volatile Expression]]> Baccharis dracunculifolia DC. and Baccharis microdonta DC. (Asteraceae) are woody species morphologically similar growing in Uruguay, where not taxonomists people often confuse them in field conditions. As the essential oil of B. dracunculifolia (‘vassoura’ oil) is highly prized by the flavor and fragrance industry, the correct differentiation of the two species is a key factor in exploiting them profitably and reasonably. To differentiate both Baccharis species, in this work their volatile expression profiles were studied as an alternative tool to
determine authenticity and quality. Volatile organic compounds (VOCs) were monthly extracted during an entire year from aerial parts of wild populations by simultaneous distillation extraction (SDE), and studied by gas chromatography/mass spectrometry (GC/MS; identification) and conventional gas chromatography (GC-FID; component abundances determination). Enantioselective gas chromatography/mass spectrometry (Es-GC/MS) was applied in the search of parameters able to ensure genuineness of each species extract. Qualitative VOCs profiles were found to be similar for both species, being β-pinene, limonene, spathulenol, caryophyllene oxide, and viridiflorol the main components. However, the abundance of those VOCs were two to ten times higher in B.
dracunculifolia than in B. microdonta during the year of study. These Baccharis spp. showed species-specific patterns of VOCs expression according to the seasonality, and interestingly, oxygenated compounds (transpinocarveol and myrtenal) increased their abundances at full-flowering stages. The enantiomeric distribution of selected monoterpenes (α- and β-pinenes, limonene, linalool, terpinen-4-ol, and α-terpineol) presented differential values for both Baccharis spp., meaning that Es-GC might be a useful tool for differentiating chemically both species in Uruguay for genuineness determination purposes.

]]> Minteguiaga, Manuel]]> González, Andrés]]> Catalán, César A. N.]]> Dellacassa, Eduardo]]> Información sobre Derechos de Autor

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]]> 10.1002/cbdv.202100064 ]]> High performance Ni-catalysts supported on rare-earth zirconates (La and Y) for hydrogen production through ethanol steam reforming. Characterization and assay]]> Musso, Mauricio]]> Cardozo, Alejandra]]> Romero, Mariano]]> Faccio, Ricardo]]> Segobia, Dario]]> Apesteguía, Carlos]]> Bussi, Juan]]>

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]]> 10.1016/j.cattod.2021.07.001 ]]> Sulfur precursor and citric acid effect on SnS2 nanoparticles and their influence on the photodegradation activity of selected organic compounds]]> nanoparticles exhibited faster kinetics for methyl orange (MO) degradation, Kapp = 0.0102 min−1, and 0.029 min−1, respectively. We proved that SnS2 is capable of breaking the azo bond of methyl orange by direct reduction. Furthermore, our analyses indicate that SnS2 nanoparticles do not degrade atrazine and imazapic, but the photocatalytic route of metribuzin competed with photolysis, resulting in a particular transformation product that was not obtained with light irradiation only. We demonstrated that SnS2 nanoparticles have high bond selectivity for azo breaking. Furthermore, they represent an advance for the development of designed materials (such as heterostructures), where the properties of SnS2 can be tuned.]]> Oreggioni, Daniela A.]]> Pérez Parada, Andrés]]> Aguiar, Ivana]]> Colazzo, Marcos]]> Pareja, Lucía]]> De León, María Andrea]]> Bentos Pereira, Heinkel]]> Pérez Barthaburu, María Eugenia]]>

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]]> patterns moderate such effect. Eight samples of liquid hand soap were obtained following a full factorial design with three 2-level variables: fragrance (herbal vs. fruity), color (green vs. orange), and transparency (transparent vs. pearly).
Samples were evaluated by 104 female participants, who rated their liking and used a
check-all-that-apply question to describe the samples in terms of sensory characteristics,
expected functional aspects of the product, and conceptual associations. Results showed that appearance and transparency did not influence consumer liking. However, fragrance had a significant effect on consumer liking, expectations and conceptual associations of liquid hand soap. The effect of fragrance on expectations and
conceptual associations depended on consumer liking of the fragrance. In addition, pearly appearance did not influence liking but had a significant effect on consumer expectations regarding functional aspects of the liquid hand soap.]]> Parente, Emma]]> Ares, Gastón]]>

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]]> Impact of oxygen adsorption on the electronic properties and contact type of a defective epitaxial graphene-SiC interface]]> SiC(0001) are herein studied by means of periodic DFT calculations coupled with the nudged elastic band method. We considered a single vacancy (SV) and a divacancy (DV) defective BL on SiC, with or without the uppermost epitaxial monolayer graphene (EG). The adsorption energy of O2 on SV and DV surfaces, producing SV-O and DV-O oxidized systems, is between 2 and 3 times as strong as that on a defect-free BL surface and lacks an energy barrier. In addition, we demonstrate that the n-doping measured in the EG layer of SiC-BL-EG systems, which stems from the charge transfer in the SiC-BL interface, can be fully compensated by oxidizing the DV defective BL. The DV-O-EG interface forms a p-type Schottky contact with a small Schottky barrier height.
Instead, a p-type Ohmic contact was measured at the SV-O-EG interface.]]> Pereyra Huelmo, Claudia]]> Denis, Pablo A.]]>

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]]> 10.1016/j.comptc.2021.113361 ]]> On the electronic properties of defective graphene buffer layer on 6HeSiC(0001)]]> on silicon carbide (SiC) can be modified by defect-induced itinerant states. Band structures and effective
masses of single vacancy (SV), divacancy (DV) and Stone-Wales (SW) defective BL were calculated.
Structural reconstruction at the vicinity of defects as well as spin polarization of silicon dangling bonds in the top bilayer SiC and nearby carbons from the BL, give rise to energetically degenerate magnetic states displaying electronic properties completely apart. This is particularly true for the SW and SV defective models where as many as three different magnetic states, turned out to be degenerate, either displaying a semiconductor nature or becoming half-metallic or even metallic. This is in contrast with previously reported results for the perfect BL (PBL) which suggested that most stable degenerate magnetic configurations share a semiconductor nature. On the other hand, for the DV system, the introduction of two
vacancies in the BL causes loss of magnetism whereas a band gap of 0.54 eV is opened. Hole effective masses decay upon removal of one and two carbon atoms in the SV and DV systems where an increase in
mobility is conceivable, provided current direction is carefully selected.]]> Pereyra Huelmo, Claudia]]> Iribarne, Federico]]> Denis, Pablo A.]]>

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]]> 10.1016/j.cocom.2021.e00538 ]]> Elastic stress induced metastable local ordering in Cu-Zr-Al metallic glasses: a numerical simulation study]]> (Common Neighbor Analysis, atomic centro-symmetry parameter, radial distribution functions and the reciprocal
space pattern). The simulations confirm the local order/disorder mechanism based on the existence of
ordered regions, which depends on the nature of the applied stress. Particularly, this work focused on performing simulations in time and stress regimes close to anelastic experimental conditions, which makes it different to other related computational reports that focus on regimes close to plastic deformation. The atomistic simulations provide strong evidence of the local ordering occurrence, in good concordance with early ultrasound assisted experiments on Cu-Zr-Al amorphous alloys, thus providing strong evidence of the local ordering occurrence in an elastic regime when uniaxial stress is applied. The reversibility of the system, when stress is removed, was also shown. The application of uniaxial stress favors the presence of different kind of local order structures, when
compared with the situation of hydrostatic pressure.]]> Pignanelli, Fernando]]> Faccio, Ricardo]]> Sarasúa, Gustavo]]> Silva Jr. Paulo Sergio]]> Moreno, Ariel]]> Información sobre Derechos de Autor

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ADVERTENCIA: La consulta de este documento queda condicionada a la aceptación de las siguientes condiciones de uso: Este documento es únicamente para usos privados enmarcados en actividades de investigación y docencia. No se autoriza su reproducción con fines de lucro. Esta reserva de derechos afecta tanto los datos del documento como a sus contenidos. En la utilización o cita de partes debe indicarse el nombre de la persona autora.]]> 10.1016/j.mtcomm.2021.102693 ]]> Short- and long-range structure correlations with ionic transport near the glass transition for lithium-ion polyacrylonitrile-based electrolytes using DMSO plasticizer ]]> Here, we report a joint experimental and theoretical study using molecular dynamics calculations focusing on short- and long-range structure correlations with ionic transport near the glass transition for lithium-ion polyacrylonitrile-
based electrolytes using DMSO as plasticizer. The presence of subtle modifications of the polymeric structural features near the glass transition (Tg) is rarely reported in the literature and could be relevant to study free volume in polymer-based electrolytes. Our in-situ small angle X-ray scattering (SAXS) analysis at different temperatures evidence an increment of free volume and partial loss of long-range coherence between polyacrylonitrile neighbor chains just above Tg in strong correlation with an Arrhenius behavior crossover observed
for the ionic transport in these polyacrylonitrile-based electrolytes. Advancing the understanding of lithium-ion
conductivity Arrhenius behavior for polymeric electrolytes with Tg slightly above room temperature could be of great relevance due to the overlap with the operating temperature range of lithium-ion batteries.

]]> Pignanelli, Fernando]]> Romero, Mariano]]> Faccio, Ricardo]]> Mombrú, Álvaro W.]]> Información sobre Derechos de Autor

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]]> 10.1016/j.jnoncrysol.2021.120744 ]]> Bi2S3 and MoS2 Soft Coatings: a comparative study of their frictional behavior under different humidity levels, normal loads, and sliding speeds]]> Bi2S3 is a promising solid lubricant for demanding applications, such as oil extraction, heavy mining, and aerospace components. However, its tribological behavior has not been studied in depth. Burnished Bi2S3 soft coatings were evaluated utilizing reciprocating sliding tests under different levels of relative humidity level, normal load, and sliding speed and the results were benchmarked against MoS2 coatings. In addition, ab initio calculations using density functional theory modeling were employed for studying the interaction between the sulfides and the steel substrates and the effect of water intercalation at an atomic level. It was found that Bi2S3 coatings present excellent environmental adaptability and substrate protection over a wide range of testing conditions, thanks to their characteristic crystal structure.

]]> Pilotti, B.]]> Prieto, G.]]> Juan, A.]]> Faccio, Ricardo]]> Broitman, E.]]> Dennehy, M.]]> Tuckart, W.R.]]> Información sobre Derechos de Autor

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ADVERTENCIA: La consulta de este documento queda condicionada a la aceptación de las siguientes condiciones de uso: Este documento es únicamente para usos privados enmarcados en actividades de investigación y docencia. No se autoriza su reproducción con fines de lucro. Esta reserva de derechos afecta tanto los datos del documento como a sus contenidos. En la utilización o cita de partes debe indicarse el nombre de la persona autora.]]> 10.1007/s11249-021-01486-y ]]> Stabilisation of sheep wool fibres under air atmosphere: study of physicochemical changes]]> Natural fibres constitute interesting, low cost and environmentally friendly precursors of carbon fibres. However,
they are prone to fuse and degrade upon thermal treatment, affecting the properties of the products unless a stabilization step was included. Aiming to reach a better understanding of the stabilization mechanism of wool as a potential precursor for the preparation of carbon fibres, in this study we have analysed the chemical, structural and morphological transformations during its oxidative stabilization in air. Below 400 ◦C, both the structure and morphology of the fibres were preserved. The chemical composition changed with the stabilization temperature; main changes include the loss of secondary protein structure, cleavage of sulphur bridges, dehydration, oxidative crosslinking and rearrangements of N-groups through the formation of carbodiimides. Oxidation of the wool at 300 ◦C rendered materials with a fibrous morphology and high carbon yield (ca. 36 wt%), yielding carbon fibres upon carbonization at high temperatures.

]]> Pina, Ana Claudia]]> Tancredi, Nestor]]> Amaya, Alejandro]]> Ania, Conchi O.]]> Información sobre Derechos de Autor

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La legislación uruguaya protege el derecho de autor sobre toda creación literaria, científica o artística, tanto en lo que tiene que ver con sus derechos morales, como en lo referente a los derechos patrimoniales con sujeción a lo establecido por el derecho común y las siguientes leyes (LEY 9.739 DE 17 DE DICIEMBRE DE 1937 SOBRE PROPIEDAD LITERARIA Y ARTISTICA CON LAS MODIFICACIONES INTRODUCIDAS POR LA LEY DE DERECHO DE AUTOR Y DERECHOS CONEXOS No. 17.616 DE 10 DE ENERO DE 2003, LEY 17.805 DE 26 DE AGOSTO DE 2004, LEY 18.046 DE 24 DE OCTUBRE DE 2006)

ADVERTENCIA - La consulta de este documento queda condicionada a la aceptación de las siguientes condiciones de uso: Este documento es únicamente para usos privados enmarcados en actividades de investigación y docencia. No se autoriza su reproducción con fines de lucro. Esta reserva de derechos afecta tanto los datos del documento como a sus contenidos. En la utilización o cita de partes debe indicarse el nombre de la persona autora.

]]> 10.1016/j.mseb.2021.115115 ]]> Induction of antigen-specific tolerance by nanobody–antigen adducts that target class-II major histocompatibility complexes]]> The association of autoimmune diseases with particular allellic products of the class-II major histocompatibility complex
(MHCII) region implicates the presentation of the offending self-antigens to T cells. Because antigen-presenting cells are
tolerogenic when they encounter an antigen under non-inflammatory conditions, the manipulation of antigen presentation may induce antigen-specific tolerance. Here, we show that, in mouse models of experimental autoimmune encephalomyelitis, type 1 diabetes and rheumatoid arthritis, the systemic administration of a single dose of nanobodies that recognize MHCII molecules and conjugated to the relevant self-antigen under non-inflammatory conditions confers long-lasting protection against these diseases. Moreover, co-administration of a nanobody–antigen adduct and the glucocorticoid dexamethasone, conjugated to the nanobody via a cleavable linker, halted the progression of established experimental autoimmune encephalomyelitis in symptomatic mice and alleviated their symptoms. This approach may represent a means of treating autoimmune conditions.

]]> Pishesha, Novalia]]> Harmand, Thibault]]> Smeding, Liyan Y.]]> Ma, Weiyi]]> Ludwing, Leif S.]]> Janssen, Robine]]> Islam, Ashraful]]> Xie, Yushu J.]]> Fang, Tao]]> McCaul, Nicholas]]> Pinney III, Wiliam]]> Sugito, Harun R.]]> Rossoti, Martin A.]]> González Sapienza, Gualberto]]> Ploegh, Hidde L.]]> Información sobre Derechos de Autor

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]]> 10.1038/s41551-021-00738-5 ]]> Co-combustion kinetics of Uruguayan oil shales with Eucalyptus grandis wastes obtained by a deconvolution method]]> ICTAC recently published a series of recommendations for analyzing thermogravimetric experiments, one of which was the deconvolution of the DrTGA; however, it has received little use for processing fuel blends. In the present work, Lorentz distribution was used to deconvolve multi-stage processes in the co-combustion of oil shales and Eucalyptus grandis sawdust from Uruguay. The activation energies values were obtained using an isoconversional-iterative procedure and the maximum value were obtained for the oil shales (401 kJ mol- 1), which is correlated with its low combustibility. The activation energies values were used to calculate the preexponential Arrhenius factors and global orders. The thermogravimetric curves were rebuilt at different heating rates (5, 10, 20, 30, 40 and 50 K min- 1). Results indicated a good agreement between the theoretically calculated values and the experimental data, obtaining a maximum average error smaller than 3%.

]]> Portugau, Patrice]]> Torres, Martín]]> Yermán, Luis]]> Cuña, Andrés]]> Castiglioni, Jorge]]> Información sobre Derechos de Autor

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]]> 10.1016/j.tca.2021.178999 ]]> Opportunities for the valorization of industrial glycerol via biotransformations ]]> Industrial biotechnology faces the challenge of providing significant
economic advantages using sustainable processes either to establish new processes, to displace established processes or valorize industrial waste. Crude glycerol obtained as a by-product of biodiesel production has very low market value but can be valorized via microbial bioconversions. This work revises efforts made by the scientific community to optimize the crude glycerol microbial biotransformation into dihydroxyacetone, one of the most valuable compounds obtained from this feedstock. Attention to the many aspects of process optimization to increase productivity has been addressed that are also transversal to other glycerol biotransformations to obtain improved yields.

]]> Ripoll, Magdalena]]> Bentancor, Lorena]]> Información sobre Derechos de Autor

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]]> 10.1016/j.cogsc.2020.100430]]> One-pot biotransformation of glycerol into serinol catalysed by biocatalytic composites made of whole cells and immobilised enzymes†]]> Biocatalytic cascades afford the development of economically sustainable and green processes. Herein we examined the unprecedented coupling of co-immobilised Gluconobacter oxydans and an isolated transaminase to synthesise serinol from glycerol.
Through this approach, we manufactured up to 36 mM serinol, the
highest titer ever reported for a non-fermentative biosynthesis.
More importantly, similar productivities are obtained starting from
the industrial by-product crude glycerol, demonstrating the possibilities of this hybrid heterogenenous biocatalyst for valorising
bio-based raw materials.

]]> Ripoll, Magdalena]]> Velasco Lozano, Susana]]> Jackson, Erienne]]> Diamanti, Eleftheria]]> Betancor, Lorena]]> López Gallego, Fernando]]> Royal Society of Chemistry]]> Información sobre Derechos de Autor

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]]> 10.1039/d0gc03918g]]>