Research on semiquantification of lethal toxin at the bottom of reactors for clostridium sordellii culture]]> Pérez Etcheverry, Diana]]> Nieto Cadenazzi, Alberto]]> Miraballes Martínez, Iris]]> 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)

]]> New perspective on thermally stimulated luminescence and crystallization of barium borate oxyfluoride glasses]]> The demand for modern materials, especially glasses, used in different applications, such as radiation sensors and spectral converters, requires a detailed study of their properties. The incorporation of fluoride compounds in borate glasses and their crystallization at the nanometric scale allows the properties of these materials to be further enhanced. Although many works showed improvements in some of these properties, some critical aspects, such as the crystallization mechanism and
the role of the fluorine phase, need more investigation. We worked with xNaF (100 - x)BaO.2B2O3 glasses with x = 0, 5, 10, 15, 20, 25, 30, and 35% (in mol) to increase the knowledge in this field. The structural modifications and the thermally stimulated luminescence of the glasses were studied,
and their crystallization was analyzed by thermal analysis and X-ray diffraction. A continuous trap distribution was found, which was responsible for its very good luminescent signal, especially in glasses with 20% NaF. By selecting a suitable amount of NaF, it is possible to obtain nanocrystals of
BaF2. These promising results we reached show the applicability of these materials.

]]> Rodríguez Chialanza, Mauiricio]]> Azcune, Germán]]> Bentos Pereira, Heinkel]]> Faccio, Ricardo]]> Información sobre Derechos de Autor (Por favor lea este aviso antes de abrir los documentos u objetos)

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 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.

]]> 10.3390/cryst11070745 ]]> The non-direct band gap in borate glasses: a brief discussion on analysis methodologies and its interpretation]]> There is great interest in the study of the optical properties of materials such as glasses, due to their possible technological applications and from a fundamental point of view. For this reason, an attempt has been made to advance the understanding of the existence of optical band gap in this type of material. In recent times, several ways of analyzing the dependence of the absorption coefficient with energy have been proposed. Using lead, strontium, and barium borate glasses as a model, this dependence has been analyzed. For this, we considered the glass structure and the corresponding crystal structure, and the value of the optical band gap energy has been discussed considering the theory of Mott and Davis and comparing with values of crystals and glasses of similar composition. Here, we used a correction method, that takes into account intrinsic defects, to obtain the values of optical band gap energies in the framework of a non-direct transition. We also include DFT simulations of the corresponding crystalline compounds and the band gap was evaluated. The absorption coefficient obtained from simulations shows the same trend that the experimental one.

]]> Rodríguez Chialanza, Mauiricio]]> Faccio, Ricardo]]> Bentos Pereira, Heinkel]]> Marotti, Ricardo]]> 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 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.]]> Nanotecnología: ejemplos y aplicaciones en la utilización de energía solar ]]> En este capítulo presentaremos de manera general aplicaciones
que la nanotecnología puede ofrecer, tanto desde el punto de vista de procesos como también de los diversos productos basados en esta nueva tecnología que actualmente se comercializan. Posteriormente discutiremos con mayor profundidad las oportunidades que ofrece el uso de la energía
solar, en particular las ventajas del uso de la nanotecnología. De esta forma mostraremos cómo esta nueva revolución tecnológica permite ir más allá de lo que se había pensado: generar nuevos productos, presentar variantes en
productos ya existentes, generar nuevos procesos, hacer viables procesos que antes no lo eran, y todo esto cuidando el ambiente.
La nanotecnología (NT) consiste en la creación de materiales
funcionales, dispositivos y sistemas a través de la manipulación de la materia a escala nanométrica. Un nanomaterial para ser catalogado como tal debe poseer en al menos una de sus dimensiones una longitud inferior a los 100 nanómetros (nm). Pero la nanotecnología también incluye la explotación de
las propiedades y los fenómenos ocurrentes a esa escala (Los Alamos National Laboratory, s/f), ya que son notoriamente diferentes a los esperados para los materiales en su forma convencional.

]]> Faccio, Ricardo]]> Las nanotecnologías en Uruguay / Adriana Chiancone y Guillermo Foladori, coords. -- Montevideo : Espacio interdisciplinario, 2013. -- p. 55-63]]> UR. Espacio Interdisciplinario]]> 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 LEY 18.046 DE 24 DE OCTUBRE DE 2006)

]]> ISBN 978-9974-0-0961-5]]> 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 ]]> Impact of the crystal size of beta zeolite on the structural quality of zeolite templated carbons]]> The impact of the crystal size of the template zeolite on the textural properties of resulting Zeolite Templated Carbons was studied using nano- (20 nm) and micron-sized (5 μm) zeolite beta crystals. ZTCs were obtained for both nano- and micron-sized zeolite beta crystals, yet for the micron-sized sample the presence of supermicropores and small mesopores was detected, indicating a higher degree of structural defects during the templating process and hence in the final ZTC. The insights gained from nitrogen physisorption were confirmed by TEM, TGA and XPS. Despite, long range structural order, evidenced by X-ray powder diffraction (XRD) for both, nano- and micron-sized ZTCs was inferred. These results suggests that XRD patterns allow to evidence the well-ordered part of the sample but might not be the method of choice for characterizing the structural quality of ZTCs. Simulated XRD powder patterns allowed to propose a graphene-based nanoribbon structure grown in the zeolite pores as a satisfactory model for ZTCs in beta zeolite.

]]> Aumond, Thibaud]]> Esteves, Martín]]> Pouilloux, Yannick]]> Faccio, Ricardo]]> Sachse, Alexander]]> 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 LEY 18.046 DE 24 DE OCTUBRE DE 2006)

]]> Scalese, Gonzalo]]> Kostenkova, Kateryna]]> Crans, Debbie C.]]> Gambino, Dinorah]]> 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 LEY 18.046 DE 24 DE OCTUBRE DE 2006)

]]> Colobbio, Maximiliano]]> Pandolfi, Enrique]]> Schapiro, Valeria]]> Información sobre Derechos de Autor

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]]> 10.3390/molecules26051423 ]]> Diversity and effect of increasing temperature on the activity of methanotrophs in sediments of fildes Peninsula Freshwater Lakes, King George Island, Antarctica]]> temperature on the CH4 oxidation potential in sediments of freshwater lakes in polar regions of the southern hemisphere.]]> Roldán, Diego M.]]> Carrizo, Daniel]]> Sánchez García, Laura]]> Menes, Rodolfo Javier]]> 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 LEY 18.046 DE 24 DE OCTUBRE DE 2006)

]]> A new procedure for thioester deprotection using thioglycolic acid in both homogeneous and heterogeneous phase]]> Classic acetyl thioester protection/deprotection methodologies are widely used in organic synthesis, but deprotection step usually requires harsh conditions not suitable for labile substrates. In this work, a new method for thioester deprotection using a thiotransesterification approach is described. Firstly, thioglycolic acid (TGA) was identified as a good deprotecting reagent in solution. In order to develop a thiol polymer-supported reagent, TGA was anchored to a PEG-based resin through an amide bond (TG-NCOSH).
Both homogeneous and heterogeneous approaches were conveniently carried out at room temperature, in aqueous buffer at pH 8. The mild conditions were suitable for alkyl and phenyl thioesters. Moreover labile thioesters containing thiazolidine and oxazolidine scaffolds, bearing amine, ester and
acetal functionalities were also deprotected. The polymer-supported TGA gave better deprotection yields compared to TGA in solution, yields ranging from 61 to 90%. The feasibility of the recovery and reuse of TG-NCO-SH reagent was explored, showing it can be reused at least five times without lossing the
activity.

]]> Villamil, Valentina]]> Saiz, Cecilia]]> Mahler, Graciela]]> Información sobre Derechos de Autor

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]]> Study of emulsifying properties of soluble proteins obtained from defatted rice bran concentrate ]]> Rice (Oryza sativa) is one of the most frequently produced cereals in the world. Rice bran (RB) is obtained as a by-product in the rice milling process. A part of the RB is used for oil extraction, obtaining defatted rice bran as a second by-product.
The aim of this work was to analyze the emulsifying properties of soluble proteins fraction present in defatted rice bran concentrate (DRBC) in acidic and neutral conditions. Fine emulsions (prepared by high-speed and ultrasound
homogenization) stabilized with soluble proteins obtained from DRBC showed a mean particle size lower than coarse emulsions (prepared by only high-speed homogenization) and a significantly lower degree of overall destabilization. Coarse emulsions showed sigmoidal destabilization profiles at pH 4.5 and 7.0, related to the existence of two populations with different particle sizes. In fine emulsions, both pH provided lower particle sizes and greater stability. After 24 h
of quiescent storage, the coarse emulsions showed an increase of particle size that was not observed in fine emulsions. Both types of emulsions showed a Newtonian-type behavior. Fine emulsions showed higher viscosity values and higher lightness than coarse emulsions, consistent with the reduction of particle
size and increase in the number of particles. The soluble proteins obtained from a waste of the rice industry can be used to obtain stable fine oil-in-water emulsions in acidic and neutral conditions. This result is of interest since it could be used as
a food ingredient, increasing the added value of this important by-product.

]]> Bonifacino, Carla]]> Palazolo, Gonzalo]]> Panizzolo, Luis A.]]> Abirached, Cecilia]]> 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 LEY 18.046 DE 24 DE OCTUBRE DE 2006)

]]> Dauber, Cecilia]]> Carreras, Tatiana]]> Fernández Fernández, Adriana]]> Irigaray, Bruno]]> Alborés, Silvana]]> Gámbaro, Adriana]]> Ibáñez, Elena]]> Vieitez, 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.]]> 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 ]]> 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 ]]> Eupatorium buniifolium Hook. ex Hook. & Arn.]]> Eupatorium buniifolium Hook. ex Hook. & Arn. (Asteraceae) is an aromatic and medicinal plant. Its area is spreading from the Southern parts of Bolivia, Brazil, Paraguay and Uruguay to the northern and central parts of Argentina. It is known as “chilca negra”, “romerillo”, “chilca”, “chirca”, “romero colorado”. The
infusion of leaves and stems is used as a digestive for stomachache, against diarrhea and for liver inflammation. Some studies have confirmed the digestive, hepatoprotective,
anti-inflammatory and antioxidant potential of this plant. The main chemical components responsible for its known biological activities have been identified as flavonoids. From E. buiniifolium leaves also an essential oil has been obtained
that is useful due to its potential insecticidal, antifungal and varroacide activities, both by direct contact and their vapors against the tested organisms. The essential oil has been demonstrated to be bioactive against the Chagas’ disease vector Triatoma infestans.

]]> Lorenzo Otero, Daniel Alberto.]]> Paz, Daniel]]> Davies, Philip]]> Villamil, José]]> Minteguiaga, Manuel]]> Dellacassa Beltrame, Eduardo Santiago]]> 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 LEY 18.046 DE 24 DE OCTUBRE DE 2006)

]]> https://doi.org/10.1007/978-3-030-62818-5_15]]> Ilex paraguariensis St. Hil.]]> Ilex paraguariensis St. Hil., from the family of holy plants, Aquifoliaceae, is a native South American tree that can reach 18 m in height and is used to produce “yerba mate”. It is found primarily in the southern regions of South America, namely, Brazil (Mato Grosso do Sul, Minas Gerais, Parana, Rio Grande do Sul, Rio de Janeiro, Santa Catarina, Sao Paulo), Argentina (Corrientes, Misiones), Paraguay (Alto Paraná, Amambay, Caaguazú, Canendiyú, Central, Guaira, Itapuá, Misiones,
San Pedro), and Uruguay. “Yerba mate” tea, an infusion made from the leaves of this tree, is a widely consumed nonalcoholic beverage in South America which is gaining rapid introduction into the world market, either as tea itself or as ingredient
in formulated foods or dietary supplements. The indigenous people have used it for centuries as a social and medicinal beverage. The container in which it is generally served is a gourd made from the dry and hollowed fruit of Lagenaria vulgaris Ser. (Cucurbitaceae), whose dimensions vary according the region and uses. It is called “mate” in the region. “Mate” has a very important social role. The act of offering and sharing it has connotations like those of the tea ceremony for some Oriental cultures.

]]> Bracesco , Nelson]]> Minteguiaga, Manuel]]> Vázquez, Álvaro]]> Cesio, Verónica]]> Heinzen, Horacio]]> Ferreira, Fernando]]> Dellacassa Beltrame, Eduardo Santiago]]> 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 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.]]> 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 ]]> NiLaM (M = Ce and/or Zr) mixed oxide catalysts for synthesis gas production by biogas reforming processes]]> NiLaM (M = Ce and/or Zr) catalysts were prepared by the polymerized complex method and evaluated in the dry, oxidative dry, and tri-reforming of a synthetic biogas (CH4/CO2 = 1.5) at 800° C and atmospheric pressure. The catalysts that possessed the highest number of total basic sites and stronger Ni-support
interaction showed better activity and coke resistance. A lower level of carbon deposits, with higher reactivity, was found for these catalysts in tri-reforming experiments. However, catalyst deactivation was observed for NiLaCe, attributed to nickel re-oxidation.

]]> Veiga, Santiago]]> Faccio, Ricardo]]> Romero, Mariano]]> Bussi, Juan]]> Información sobre Derechos de Autor

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]]> Ventura, Oscar N.]]> Kieninger, Martina]]> Katz, Aline]]> Vega Teijido, Mauricio]]> Segovia, Marc]]> Irving, Kenneth]]> Información sobre Derechos de Autor

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]]> New preparation protocols for coumarin-thiosemicarbazone hybrids: solid state characterization, and in silico /NMR studies of the Z/E isomerization equilibria in solution]]> Rostán, Santiago]]> Alvarez, Natalia]]> Veiga, Nicolás]]> Otero, Lucía]]> Mahler, G.]]> 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 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.]]> New silver(I) phosphino complexes : evaluation of their potential as prospective agents against Mycobacterium tuberculosis]]> Despite being a preventable and curable disease, Tuberculosis (TB) is the world's top infectious killer. Development of new drugs is urgently needed. In this work, the synthesis and characterization of new silver(I) complexes, that include N′ -[(E)-(pyridine-2-ylmethylene)pyrazine-2-carbohydrazide, HPCPH, as main ligand and substituted aryl-phosphines as auxiliary ligands, is reported. HPCPH was synthesized from pyrazinoic acid, the active metabolite of the first-line antimycobacterial drug pyrazinamide. Complexes [Ag(HPCPH)(PPh3)2]OTf (1), [Ag(HPCPH)((P(p-tolyl)3)2]OTf (2) and [Ag(HPCPH)(P(p-anisyl)3)2]OTf (3) were characterized in solid state and in solution by elemental analysis and FTIR and NMR spectroscopies (OTf––triflate). Crystal structures of (1,2) were determined by XRD. The Ag atom is coordinated to azomethine and pyridine nitrogen atoms of HPCPH ligand and to the phosphorous atom of each aryl-phosphine co-ligand. Although HPCPH did not show activity, the Ag(I) compounds demonstrated activity against Mycobacterium tuberculosis (MTB), H37Rv strain, and multidrug resistant clinical isolates (MDR-TB). Globally, results showed that the compounds are not only effective against the sensitive strain, but are more potent against MDR-TB than antimycobacterial drugs used in therapy.
The compounds showed low to moderate selectivity index values (SI) towards the bacteria, using MRC-5 cells (ATCC CCL-171) as mammalian cell model. Interaction with DNA was explored to get insight into the potential mechanism of action against the pathogen. No significant interaction was detected, allowing to discard this biomolecule as a potential molecular target. Compound 1 was identified as a hit compound (MIC90 2.23 μM; SI 4.4) to develop further chemical modifications in the search for new drugs.

]]> Maldonado, Yndira Dolores]]> Scalese, Gonzalo]]> Manieri, Karyn Fernanda]]> Pavan, Fernando R.]]> Aguirre Méndez, Larry D.]]> Gambino, Dinorah]]> 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 LEY 18.046 DE 24 DE OCTUBRE DE 2006)

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]]> 10.1016/j.poly.2021.115406 ]]> Fe(III)-Complex-Imprinted polymers for the green oxidative degradation of the methyl orange dye pollutant]]> One of the biggest problems worldwide is the pollution of natural water bodies by dyes coming from effluents used in the textile industry. In the quest for novel effluent treatment alternatives, the aim of this work was to immobilize Fe(III) complexes in molecularly imprinted polymers (MIPs) to produce efficient Fenton-like heterogeneous catalysts for the green oxidative degradation of the methyl orange (MO) dye pollutant. Different metal complexes bearing commercial and low-cost
ligands were assayed and their catalytic activity levels towards the discoloration of MO by H2O2 were assessed. The best candidates were Fe(III)-BMPA (BMPA = di-(2-picolyl)amine) and Fe(III)-NTP (NTP = 3,30,3”-nitrilotripropionic acid), displaying above 70% MO degradation in 3 h. Fe(III)-BMPA
caused the oxidative degradation through two first-order stages, related to the formation of BMPAFe- OOH and the generation of reactive oxygen species. Only the first of these stages was detected for Fe(III)-NTP. Both complexes were then employed to imprint catalytic cavities into MIPs. The polymers showed catalytic profiles that were highly dependent on the crosslinking agent employed, with N,N-methylenebisacrylamide (MBAA) being the crosslinker that rendered polymers with optimal oxidative performance (>95% conversion). The obtained ion-imprinted polymers constitute cheap and robust solid matrices, with the potential to be coupled to dye-containing effluent treatment systems with synchronous H2O2 injection.

]]> Haller, Paulina]]> Machado, Ignacio]]> Torres, Julia]]> Vila, Agustina]]> Veiga, Nicolás]]> Información sobre Derechos de Autor

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