C.E. Rodrı́guez Torres

Universidad Nacional de La Plata

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F. H. Sánchez

Universidad Nacional de La Plata

A.F. Cabrera

Consejo Nacional de Investigaciones Científicas y Técnicas

L. A. Errico

National University of Northwestern Buenos Aires

A.M. Mudarra Navarro

Consejo Nacional de Investigaciones Científicas y Técnicas

M. B. Fernández van Raap

Instituto de Física La Plata

S. J. Stewart

Consejo Nacional de Investigaciones Científicas y Técnicas

K.L. Salcedo Rodríguez

Consejo Nacional de Investigaciones Científicas y Técnicas

F. Golmar

National University of General San Martín

V. Bilovol

Consejo Nacional de Investigaciones Científicas y Técnicas

F.D. Saccone

University of Buenos Aires

Cooperative Institutions

Consejo Nacional de Investigaciones Científicas y Técnicas

Universidad Nacional de La Plata

Instituto de Física La Plata

Centro Científico Tecnológico - San Juan

University of Buenos Aires

Universidade Federal de Alfenas

Consejo Superior de Investigaciones Científicas

Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas

Centro Científico Tecnológico - Tucumán

Fundación Ciencias Exactas y Naturales

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Differential Scanning Calorimetry and Infrared Spectroscopy Combined with Chemometric Analysis to the Determination of Coffee Adulteration by Corn

Journal of the Brazilian Chemical Society (2016)

Ariadne M. Brondi C.E. Rodrı́guez Torres Jerusa S. Garcia Marcello G. Trevisan

Roasted and ground coffee is targeted by fraudulent addiction of products.In this way the determination of contaminants in coffee has economic and nutritional importance.In this study, the coffee adulteration by corn were detected using DSC (differential scanning calorimetry) and FTIR (Fourier transform infrared spectroscopy) coupled to PCA (principal component analysis), and PLS (partial least squares) models.Three different levels of roasted and ground Coffea arabica L. were used to prepare mixtures with roasted and ground corn.The level of adulteration used was between 0.5 to 40% (m/m).It was observed that both DSC and FTIR coupled with PCA are able to discriminate adulterated from unadulterated samples of coffee by corn at levels below 1%.PLS models were built with DSC and FTIR data reaching good correlation between the values of estimated and reference concentrations, with RMSECV (root mean square error of cross-validation) lower than 3.5% for DSC data and 2.7% for FTIR data.

10.21577/0103-5053.20160296

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CCDC 789276: Experimental Crystal Structure Determination

The Cambridge Structural Database (2017)

J.F.N. Batista Jarrett W. Cruz A.C. Doriguetto C.E. Rodrı́guez Torres Eduardo Tonon de Almeida

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

10.5517/ccdc.csd.ccvh9j4

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Mechanical Grinding of Iron Borides

Materials science forum (1995)

C.E. Rodrı́guez Torres F. H. Sánchez L. Mendoza‐Zélis M. B. Fernández van Raap

10.4028/www.scientific.net/msf.179-181.103

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Ferromagnetism in doped TiO₂thin films prepared by PLD

Journal of Physics Conference Series (2007)

S. Duhalde C.E. Rodrı́guez Torres M.F Vignolo F. Golmar C Chillote

Transition-Metal-doped TiO2 thin films, with nominal composition Ti0.9TM0.1O2-δ (TM = Mn, Fe, Co, Ni, Cu), were grown by pulsed laser deposition (PLD), in order to study the role of dopants in the origin and significance of room temperature ferromagnetism in these systems. The crystallographic structures and their magnetic properties were characterized and the experimental results are compared to ab-initio calculations previously reported. The films are ferromagnetic at room temperature in the cases of Fe, Co, Ni and even Cu impurities, but not in the case of Mn doping. Our results support the hypothesis that oxygen vacancies play a key role in the origin of magnetism in doped TiO2 films, and can explain the diversity of magnetic moments observed experimentally for films grown under different conditions.

Pulsed Laser Deposition

Magnetism

Magnetic semiconductor

10.1088/1742-6596/59/1/103

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Silica-Coated Magnetic Particles for Efficient RNA Extraction for SARS-CoV-2 Detection

Natalia Capriotti Leslie C. Amorós Morales Elisa de Sousa Luciana C. Juncal Matías L. Pidre

Molecular diagnostic methods to detect and quantify viral RNA in clinical samples rely on the purification of the genetic material prior to reverse transcription polymerase chain reaction (qRT-PCR). Due to the large number of samples processed in clinical laboratories, automation has become a necessity in order to increase method processivity and maximize throughput per unit of time. An attractive option for isolating viral RNA is based on the magnetic solid phase separation procedure (MSPS) using magnetic microparticles. This method offers the advantage over other alternative methods of making it possible to automate the process. In this study we report the results of the MSPS method, based on magnetic microparticles obtained by a simple synthesis process, to purify RNA from oro- and nasopharyngeal swab samples of patients suspected of COVID-19 provided by three diagnostic laboratories located in the Buenos Aires Province, Argentina. Magnetite nanoparticles of Fe3O4 (MNPs) were synthesized by the coprecipitation method and then coated with silica (SiO2) produced by hydrolysis of tetraethyl orthosilicate (TEOS). After preliminary tests on samples from the A549 human lung cell line and swabs, an extraction protocol was developed. The quantity and purity of the RNA obtained were determined by gel electrophoresis, spectrophotometry, and qRT-PCR. Tests on samples from naso- and oropharyngeal swabs were performed in order to validate the method for RNA purification in high-throughput SARS-CoV2 diagnosis by qRT-PCR. The method was compared to the spin columns method and the automated method using commercial magnetic particles. The results show that the method developed is efficient for RNA extraction from nasal and oropharyngeal swab samples, and also comparable to other extraction methods in terms of sensitivity for SARS-CoV-2 detection. Of note, this procedure and reagents developed locally are intended to overcome the shortage of imported diagnostic supplies as the sudden spread of COVID-19 required unexpected quantities of nucleic acid isolation and diagnostic kits worldwide.

10.2139/ssrn.4418911

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Citations (1)

Hydrogenation-Disproportionation Reactions in Nd14.01Fe78.91Hf0.08B6.99

Materials science forum (2000)

C.E. Rodrı́guez Torres F.D. Saccone F. H. Sánchez L. Mendoza‐Zélis

10.4028/www.scientific.net/msf.343-346.551

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Maintenance of heavy metal biosorption systems

Teresa Tavares Jacinta Gonçalves C.E. Rodrı́guez Torres

Biosorption

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Oxygen-vacancy-induced local ferromagnetism as a driving mechanism in enhancing the magnetic response of ferrites

Physical Review B (2014)

C.E. Rodrı́guez Torres G. A. Pasquevich P. Mendoza Zélis F. Golmar S. P. Heluani

This work probes the relevance of oxygen vacancies in the formation of local ferromagnetic coupling between Fe ions at octahedral sites in zinc ferrites. This coupling gives rise to a ferrimagnetic ordering with the Curie temperatures above room temperature in an otherwise antiferromagnetic compound. This conclusion is based on experimental results from x-ray magnetic circular dichroism measurements at the $\mathrm{Fe}{\mathrm{L}}_{2,3}$ edges and magnetization measurements performed on zinc ferrites, nanoparticles, and films, with different cation distributions and oxygen vacancy concentrations. Our observations are confirmed by density-functional-theory calculations and indicate that the enhanced ferrimagnetic response observed in some nominally nonmagnetic or antiferromagnetic ferrites can be taken as a further example of the defect-induced magnetism phenomenon.

Ferrimagnetism

Magnetism

10.1103/physrevb.89.104411

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Citations (98)

Biosorption of chromium

Teresa Tavares Jacinta Gonçalves C.E. Rodrı́guez Torres

Biosorption

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Citations (13)

Hydrogenation-disproportionation processes in Nd14.01Hf0.08Fe78.91B6.99 alloys