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Cruz Del Álamo A, Puga A, Pariente MI, Rosales E, Molina R, Pazos M, Martínez F, Sanromán MA. Activity and stability of bifunctional perovskite/carbon-based electrodes for the removal of antipyrine by electro-Fenton process. Chemosphere 2023; 334:138858. [PMID: 37178935 DOI: 10.1016/j.chemosphere.2023.138858] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2023] [Revised: 05/03/2023] [Accepted: 05/04/2023] [Indexed: 05/15/2023]
Abstract
Bifunctional perovskite/carbon-black(CB)/polytetrafluoroethylene(PTFE) electrodes for electro-generation and catalytic decomposition of hydrogen peroxide to oxidizing hydroxyl radicals have been fabricated. These electrodes were tested for electroFenton (EF) removal of antipyrine (ANT) as a model antipyretic and analgesic drug. The influence of the binder loading (20 and 40 wt % PTFE) and type of solvent (1,3-dipropanediol and water) was studied for the preparation of CB/PTFE electrodes. The electrode prepared with 20 wt % PTFE and water exhibited a low impedance and remarkable H2O2 electro-generation (about 1 g/L after 240 min, a production rate of ca. 6.5 mg/h·cm2). The incorporation of perovskite on CB/PTFE electrodes was also studied following two different methods: i) direct deposition on the CB/PTFE electrode surface and ii) addition in the own CB/PTFE/water paste used for the fabrication. Physicochemical and electrochemical characterization techniques were used for the electrode's characterization. The dispersion of perovskite particles in the own electrode matrix (method ii) exhibited a higher EF performance than the immobilisation onto the electrode surface (method i). EF experiments at 40 mA/cm2 and pH 7 (non-acidified conditions) showed ANT and TOC removals of 30% and 17%, respectively. The increase of current intensity up to 120 mA/cm2 achieved the complete removal of ANT and 92% of TOC mineralisation in 240 min. The bifunctional electrode also proved high stability and durability after 15 h of operation.
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Affiliation(s)
- A Cruz Del Álamo
- Department of Chemical and Environmental Technology, ESCET, Rey Juan Carlos University, 28933, Móstoles, Madrid, Spain
| | - A Puga
- CINTECX, Universidad de Vigo, Grupo de Bioingeniería y Procesos Sostenibles, Departamento de Ingeniería Química, Campus Lagoas-Marcosende, Vigo, 36310, Spain
| | - M I Pariente
- Department of Chemical and Environmental Technology, ESCET, Rey Juan Carlos University, 28933, Móstoles, Madrid, Spain
| | - E Rosales
- CINTECX, Universidad de Vigo, Grupo de Bioingeniería y Procesos Sostenibles, Departamento de Ingeniería Química, Campus Lagoas-Marcosende, Vigo, 36310, Spain
| | - R Molina
- Department of Chemical and Environmental Technology, ESCET, Rey Juan Carlos University, 28933, Móstoles, Madrid, Spain
| | - M Pazos
- CINTECX, Universidad de Vigo, Grupo de Bioingeniería y Procesos Sostenibles, Departamento de Ingeniería Química, Campus Lagoas-Marcosende, Vigo, 36310, Spain
| | - F Martínez
- Department of Chemical and Environmental Technology, ESCET, Rey Juan Carlos University, 28933, Móstoles, Madrid, Spain.
| | - M A Sanromán
- CINTECX, Universidad de Vigo, Grupo de Bioingeniería y Procesos Sostenibles, Departamento de Ingeniería Química, Campus Lagoas-Marcosende, Vigo, 36310, Spain.
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Puga A, Meijide J, Pazos M, Rosales E, Sanromán M. Electric field as a useful tool to improve the poor adsorption affinity of pollutants on carbonaceous aerogel pellets. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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Douterelo I, Dutilh BE, Calero C, Rosales E, Martin K, Husband S. Impact of phosphate dosing on the microbial ecology of drinking water distribution systems: Fieldwork studies in chlorinated networks. Water Res 2020; 187:116416. [PMID: 33039899 DOI: 10.1016/j.watres.2020.116416] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2020] [Revised: 09/03/2020] [Accepted: 09/08/2020] [Indexed: 06/11/2023]
Abstract
Phosphate is routinely dosed to ensure regulatory compliance for lead in drinking water distribution systems. Little is known about the impact of the phosphate dose on the microbial ecology in these systems and in particular the endemic biofilms. Disturbance of the biofilms and embedded material in distribution can cause regulatory failures for turbidity and metals. To investigate the impact of phosphate on developing biofilms, pipe wall material from four independent pipe sections was mobilised and collected using two twin-flushing operations a year apart in a chlorinated UK network pre- and post-phosphate dosing. Intensive monitoring was undertaken, including turbidity and water physico-chemistry, traditional microbial culture-based indicators, and microbial community structure via sequencing the 16S rRNA gene for bacteria and the ITS2 gene for fungi. Whole metagenome sequencing was used to study shifts in functional characteristics following the addition of phosphate. As an operational consequence, turbidity responses from the phosphate-enriched water were increased, particularly from cast iron pipes. Differences in the taxonomic composition of both bacteria and fungi were also observed, emphasising a community shift towards microorganisms able to use or metabolise phosphate. Phosphate increased the relative abundance of bacteria such as Pseudomonas, Paenibacillus, Massilia, Acinetobacter and the fungi Cadophora, Rhizophagus and Eupenicillium. Whole metagenome sequencing showed with phosphate a favouring of sequences related to Gram-negative bacterium type cell wall function, virions and thylakoids, but a reduction in the number of sequences associated to vitamin binding, methanogenesis and toxin biosynthesis. With current faecal indicator tests only providing risk detection in bulk water samples, this work improves understanding of how network changes effect microbial ecology and highlights the potential for new approaches to inform future monitoring or control strategies to protect drinking water quality.
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Affiliation(s)
- I Douterelo
- Pennine Water Group, Department of Civil and Structural Engineering, Sir Frederick Mappin Building, University of Sheffield, Sheffield, S1 3JD, United Kingdom.
| | - B E Dutilh
- Theoretical Biology and Bioinformatics, Science for Life, Utrecht University, Hugo R. Kruytgebouw, Padualaan 8, 3584, CH, Utrecht, Netherlands
| | - C Calero
- Pennine Water Group, Department of Civil and Structural Engineering, Sir Frederick Mappin Building, University of Sheffield, Sheffield, S1 3JD, United Kingdom
| | - E Rosales
- Pennine Water Group, Department of Civil and Structural Engineering, Sir Frederick Mappin Building, University of Sheffield, Sheffield, S1 3JD, United Kingdom
| | - K Martin
- Dwr Cymru Welsh Water, Pentwyn Road, Nelson, Treharris, Mid Glamorgan CF46 6LY, United Kingdom
| | - S Husband
- Pennine Water Group, Department of Civil and Structural Engineering, Sir Frederick Mappin Building, University of Sheffield, Sheffield, S1 3JD, United Kingdom
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Acevedo-García V, Rosales E, Puga A, Pazos M, Sanromán M. Synthesis and use of efficient adsorbents under the principles of circular economy: Waste valorisation and electroadvanced oxidation process regeneration. Sep Purif Technol 2020. [DOI: 10.1016/j.seppur.2020.116796] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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Gómez-Soto D, Galván S, Rosales E, Bienert P, Abreu I, Bonilla I, Bolaños L, Reguera M. Insights into the role of phytohormones regulating pAtNIP5;1 activity and boron transport in Arabidopsis thaliana. Plant Sci 2019; 287:110198. [PMID: 31481193 DOI: 10.1016/j.plantsci.2019.110198] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2019] [Revised: 07/17/2019] [Accepted: 07/21/2019] [Indexed: 05/29/2023]
Abstract
Aiming to counteract B deficiency impacts, plants have developed different strategies in order to reach an optimal growth in soils with limited B availability. These include B transport mechanisms that involves a facilitated transport, via channel proteins, and a high-affinity active transport driven by borate transporters. The AtNIP5;1 channel protein is a member of Major Intrinsic Protein family which facilitates B influx into the roots under low B supply. In order to explore the phytohormone-dependent regulation of AtNIP5;1, the effects of abscisic acid (ABA), ethylene, auxins and cytokinins on the activity of AtNIP5;1 promoter were evaluated using the reporter line pNIP5;1-GUS. The results show that ABA treatment increased pAtNIP5;1 activity. Besides, a larger B uptake was found following ABA treatment under B deficiency suggesting a role of ABA inducing B uptake. The ethylene precursor 1-aminocyclopropane-1-carboxylic acid (ACC) caused an induction of AtNIP5;1 expression although did not correlate with higher B concentrations nor with an improvement in root growth. On the contrary, auxins and cytokinins caused slight changes in pAtNIP5;1 induction. Altogether, these results show a regulatory role of phytohormones in AtNIP5;1 promoter what may affect B transport. The herein provided information may contribute to better understand the regulation of B transport in plants towards minimizing B deficiency impacts on agriculture.
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Affiliation(s)
- D Gómez-Soto
- Departamento de Biología, Universidad Autónoma de Madrid, c/Darwin 2, Campus de Cantoblanco, 28049, Madrid, Spain
| | - S Galván
- Departamento de Biología, Universidad Autónoma de Madrid, c/Darwin 2, Campus de Cantoblanco, 28049, Madrid, Spain
| | - E Rosales
- Departamento de Biología, Universidad Autónoma de Madrid, c/Darwin 2, Campus de Cantoblanco, 28049, Madrid, Spain
| | - P Bienert
- IPK-Leibniz Institute of Plant Genetics and Crop Plant Research, Department of Physiology and Cell Biology, 06466, Gatersleben, Germany
| | - I Abreu
- Departamento de Biología, Universidad Autónoma de Madrid, c/Darwin 2, Campus de Cantoblanco, 28049, Madrid, Spain
| | - I Bonilla
- Departamento de Biología, Universidad Autónoma de Madrid, c/Darwin 2, Campus de Cantoblanco, 28049, Madrid, Spain
| | - L Bolaños
- Departamento de Biología, Universidad Autónoma de Madrid, c/Darwin 2, Campus de Cantoblanco, 28049, Madrid, Spain
| | - M Reguera
- Departamento de Biología, Universidad Autónoma de Madrid, c/Darwin 2, Campus de Cantoblanco, 28049, Madrid, Spain.
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Poza-Nogueiras V, Arellano M, Rosales E, Pazos M, Sanromán MA, González-Romero E. Electroanalytical techniques applied to monitoring the electro-Fenton degradation of aromatic imidazolium-based ionic liquids. J APPL ELECTROCHEM 2018. [DOI: 10.1007/s10800-018-1236-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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Poza-Nogueiras V, Arellano M, Rosales E, Pazos M, González-Romero E, Sanromán MA. Heterogeneous electro-Fenton as plausible technology for the degradation of imidazolinium-based ionic liquids. Chemosphere 2018; 199:68-75. [PMID: 29428517 DOI: 10.1016/j.chemosphere.2018.01.174] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2017] [Revised: 01/30/2018] [Accepted: 01/31/2018] [Indexed: 06/08/2023]
Abstract
Conventional water treatments are generally inadequate for degradation of emerging pollutants such as ionic liquids (ILs). The use of heterogeneous electro-Fenton (HEF) has attracted great interest, due to its ability to efficiently oxidize a wide range of organic pollutants operating in cycles or in continuous mode. In this study, the removal of a complex IL from the imidazolinium family (1,3-Bis(2,4,6-trimethylphenyl)imidazolinium chloride), by means of HEF using iron alginate spheres as catalyst has been investigated, resulting in significant TOC decay after 6 h. The optimization of the key process parameters (current, IL concentration and catalyst dosage) has been performed using a Box-Behnken experimental design and achieving 76.98% of TOC abatement in 2 h of treatment. Current proved to be a crucial parameter and high catalyst dosage is required to achieve the maximum removal. In addition, an insight about the availability of iron into the reactor and the evolution of several intermediates has been carried out by employing differential pulse voltammetry on screen-printed carbon electrodes. The evolution of the different voltammetric peaks confirmed the influence of iron release, and the generation of several iron complexes has permitted the comprehension of the degradation pathway, which has been validated by chromatographic techniques.
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Affiliation(s)
- V Poza-Nogueiras
- Centro de Investigación Tecnolóxico Industrial - MTI, University of Vigo, Campus Lagoas-Marcosende, 36310 Vigo, Spain
| | - M Arellano
- Centro de Investigación Tecnolóxico Industrial - MTI, University of Vigo, Campus Lagoas-Marcosende, 36310 Vigo, Spain
| | - E Rosales
- Centro de Investigación Tecnolóxico Industrial - MTI, University of Vigo, Campus Lagoas-Marcosende, 36310 Vigo, Spain
| | - M Pazos
- Centro de Investigación Tecnolóxico Industrial - MTI, University of Vigo, Campus Lagoas-Marcosende, 36310 Vigo, Spain
| | - E González-Romero
- Department of Analytical and Food Chemistry, University of Vigo, Campus Lagoas-Marcosende, 36310 Vigo, Spain.
| | - M A Sanromán
- Centro de Investigación Tecnolóxico Industrial - MTI, University of Vigo, Campus Lagoas-Marcosende, 36310 Vigo, Spain.
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Meijide J, Rosales E, Pazos M, Sanromán MA. p-Nitrophenol degradation by electro-Fenton process: Pathway, kinetic model and optimization using central composite design. Chemosphere 2017; 185:726-736. [PMID: 28732333 DOI: 10.1016/j.chemosphere.2017.07.067] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2017] [Revised: 07/12/2017] [Accepted: 07/13/2017] [Indexed: 06/07/2023]
Abstract
The chemical process scale-up, from lab studies to industrial production, is challenging and requires deep knowledge of the kinetic model and the reactions that take place in the system. This knowledge is also useful in order to be employed for the reactor design and the determination of the optimal operational conditions. In this study, a model substituted phenol such as p-nitrophenol was degraded by electro-Fenton process and the reaction products yielded along the treatment were recorded. The kinetic model was developed using Matlab software and was based on main reactions that occurred until total mineralization which allowed predicting the degradation pathway under this advanced oxidation process. The predicted concentration profiles of p-nitrophenol, their intermediates and by-products in electro-Fenton process were validated with experimental assays and the results were consistent. Finally, based on the developed kinetic model the degradation process was optimized using central composite design taking as key parameters the ferrous ion concentration and current density.
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Affiliation(s)
- J Meijide
- Department of Chemical Engineering University of Vigo, Isaac Newton Building, Campus As Lagoas, Marcosende, 36310, Vigo, Spain
| | - E Rosales
- Department of Chemical Engineering University of Vigo, Isaac Newton Building, Campus As Lagoas, Marcosende, 36310, Vigo, Spain
| | - M Pazos
- Department of Chemical Engineering University of Vigo, Isaac Newton Building, Campus As Lagoas, Marcosende, 36310, Vigo, Spain
| | - M A Sanromán
- Department of Chemical Engineering University of Vigo, Isaac Newton Building, Campus As Lagoas, Marcosende, 36310, Vigo, Spain.
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San Martín M, Parra R, Rosales E, López M. Acción letal de la hiperluteinización ovárica y del exceso de progesterona sobre embriones y fetos. An Fac med 2014. [DOI: 10.15381/anales.v37i4.9562] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
Abstract
El exceso de progesterona y la hiperluteinización ovárica al parecer producen muerte embrionaria, no sólo en gestaciones que se inician concomitantemente al exceso endógeno o exógeno, de progesterona, sino también, en gestaciones que existían desde antes de producirse la sobretasa hormonal.
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Pazos M, Iglesias O, Gómez J, Rosales E, Sanromán M. Remediation of contaminated marine sediment using electrokinetic–Fenton technology. J IND ENG CHEM 2013. [DOI: 10.1016/j.jiec.2012.11.010] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Iglesias O, Rosales E, Pazos M, Sanromán MA. Electro-Fenton decolourisation of dyes in an airlift continuous reactor using iron alginate beads. Environ Sci Pollut Res Int 2013; 20:2252-2261. [PMID: 22851224 DOI: 10.1007/s11356-012-1100-0] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2012] [Accepted: 07/16/2012] [Indexed: 06/01/2023]
Abstract
In this study, electro-Fenton dye degradation was performed in an airlift continuous reactor configuration by harnessing the catalytic activity of Fe alginate gel beads. Electro-Fenton experiments were carried out in an airlift reactor with a working volume of 1.5 L, air flow of 1.5 L/min and 115 g of Fe alginate gel beads. An electric field was applied by two graphite bars connected to a direct current power supply with a constant potential drop. In this study, Lissamine Green B and Reactive Black 5 were selected as model dyes. Fe alginate gel beads can be used as an effective heterogeneous catalyst for the degradation of organic dyes in the electro-Fenton process, as they are more efficient than the conventional electrochemical techniques. At optimal working conditions (3 V and pH 2), the continuous process was performed. For both dyes, the degree of decolourisation increases when the residence time augments. Taking into account hydrodynamic and kinetic behaviour, a model to describe the reactor profile was obtained, and the standard deviation between experimental and theoretical data was lower than 6%. The results indicate the suitability of the electro-Fenton technique to oxidise polluted effluents in the presence of Fe alginate gel beads. Moreover, the operation is possible in a continuous airlift reactor, due to the entrapment of iron in the alginate matrix.
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Affiliation(s)
- O Iglesias
- Department of Chemical Engineering, University of Vigo, Isaac Newton Building, Campus As Lagoas, Marcosende, 36310 Vigo, Spain
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Iglesias O, Fernández de Dios MA, Rosales E, Pazos M, Sanromán MA. Optimisation of decolourisation and degradation of Reactive Black 5 dye under electro-Fenton process using Fe alginate gel beads. Environ Sci Pollut Res Int 2013; 20:2172-2183. [PMID: 22733554 DOI: 10.1007/s11356-012-1035-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2012] [Accepted: 06/07/2012] [Indexed: 06/01/2023]
Abstract
The aim of this work was to improve the ability of the electro-Fenton process using Fe alginate gel beads for the remediation of wastewater contaminated with synthetic dyes and using a model diazo dye such as Reactive Black 5 (RB5). Batch experiments were conducted to study the effects of main parameters, such as voltage, pH and iron concentration. Dye decolourisation, reduction of chemical oxygen demand (COD) and energy consumption were studied. Central composite face-centred experimental design matrix and response surface methodology were applied to design the experiments and to evaluate the interactive effects of the three studied parameters. A total of 20 experimental runs were set, and the kinetic data were analysed using first-order and second-order models. In all cases, the experimental data were fitted to the empirical second-order model with a suitable degree for the maximum decolourisation of RB5, COD reduction and energy consumption by electro-Fenton-Fe alginate gel beads treatment. Working with the obtained empirical model, the optimisation of the process was carried out. The second-order polynomial regression model suggests that the optimum conditions for attaining maximum decolourisation, COD reduction and energy consumption are voltage, 5.69 V; pH 2.24 and iron concentration, 2.68 mM. Moreover, the fixation of iron on alginate beads suggests that the degradation process can be developed under this electro-Fenton process in repeated batches and in a continuous mode.
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Affiliation(s)
- O Iglesias
- Department of Chemical Engineering, University of Vigo, Isaac Newton Building, Campus As Lagoas, Marcosende, 36310 Vigo, Spain
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Rosales E, Sanromán MA, Pazos M. Application of central composite face-centered design and response surface methodology for the optimization of electro-Fenton decolorization of Azure B dye. Environ Sci Pollut Res Int 2012; 19:1738-1746. [PMID: 22161116 DOI: 10.1007/s11356-011-0668-0] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2011] [Accepted: 11/14/2011] [Indexed: 05/31/2023]
Abstract
PURPOSE The aim of this work was to improve the ability of electro-Fenton technique for the remediation of wastewater contaminated with synthetic dyes using a model azo dye such as Azure B. METHODS Batch experiments were conducted to study the effects of main parameters, such as dye concentration, electrode surface area, treatment time, and voltage. In this study, central composite face-centered experimental design matrix and response surface methodology were applied to design the experiments and evaluate the interactive effects of the four studied parameters. A total of 30 experimental runs were set, and the kinetic data were analyzed using first- and second-order models. RESULTS The experimental data fitted to the empirical second-order model of a suitable degree for the maximum decolorization of Azure B by electro-Fenton treatment. ANOVA analysis showed high coefficient of determination value (R(2) = 0.9835) and reasonable second-order regression prediction. Pareto analysis suggests that the variables, time, and voltage produce the largest effect on the decolorization rate. CONCLUSION Optimum conditions suggested by the second-order polynomial regression model for attaining maximum decolorization were dye concentration 4.83 mg/L, electrode surface area 15 cm(2), voltage 14.19 V, and treatment time of 34.58 min.
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Affiliation(s)
- E Rosales
- Department of Chemical Engineering, University of Vigo, Campus As Lagoas, Marcosende, Vigo, Spain
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Rosales E, Iglesias O, Pazos M, Sanromán MA. Decolourisation of dyes under electro-Fenton process using Fe alginate gel beads. J Hazard Mater 2012; 213-214:369-377. [PMID: 22381372 DOI: 10.1016/j.jhazmat.2012.02.005] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2011] [Revised: 01/23/2012] [Accepted: 02/04/2012] [Indexed: 05/31/2023]
Abstract
This study focuses on the application of electro-Fenton technique by use of catalytic activity of Fe alginate gel beads for the remediation of wastewater contaminated with synthetic dyes. The Fe alginate gel beads were evaluated for decolourisation of two typical dyes, Lissamine Green B and Azure B under electro-Fenton process. After characterization of Fe alginate gel beads, the pH effect on the process with Fe alginate beads and a comparative study of the electro-Fenton process with free Fe and Fe alginate bead was done. The results showed that the use of Fe alginate beads increases the efficiency of the process; moreover the developed particles show a physical integrity in a wide range of pH (2-8). Around 98-100% of dye decolourisation was obtained for both dyes by electro-Fenton process in successive batches. Therefore, the process was performed with Fe alginate beads in a bubble continuous reactor. High color removal (87-98%) was attained for both dyes operating at a residence time of 30 min, without operational problems and maintaining particle shapes throughout the oxidation process. Consequently, the stable performance of Fe alginate beads opens promising perspectives for fast and economical treatment of wastewater polluted by dyes or similar organic contaminants.
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Affiliation(s)
- E Rosales
- Department of Chemical Engineering, University of Vigo, Isaac Newton Building, Campus As Lagoas, Marcosende 36310, Vigo, Spain
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Pazos M, Rosales E, Alcántara T, Gómez J, Sanromán MA. Decontamination of soils containing PAHs by electroremediation: a review. J Hazard Mater 2010; 177:1-11. [PMID: 20006434 DOI: 10.1016/j.jhazmat.2009.11.055] [Citation(s) in RCA: 95] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2009] [Revised: 10/28/2009] [Accepted: 11/08/2009] [Indexed: 05/28/2023]
Abstract
During the last years, the anthropogenic sources have contributed to organic compound penetration into the environment. One large group of persistent and toxic contaminants is the hydrophobic organic contaminants. Among them, polycyclic aromatic hydrocarbons (PAHs) have been recognized as a representative group of these pollutants with low solubility. In this paper, it is showed the electroremediation of soil contaminated with PAHs as an alternative, to organic compound removal. This technique, mainly used for heavy metal extraction, applies the electric current to promote the movement of contaminants. Nowadays the application of this technique alone or combined with other techniques as for example Fenton or bioremediation is taking fine results to PAHs removal. Although the PAHs soil decontamination by means of the electric field is in an initial stage, many researchers have demonstrated the treatment effectiveness. This paper describes the foremost principles to carry out the electroremediation of soils contaminated with PAHs, just like the different alternatives to improve the electroremediation of PAHs and also the new methodologies of PAHs removal by using hybrid technologies.
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Affiliation(s)
- M Pazos
- Department of Chemical Engineering, University of Vigo, E-36310 Vigo, Spain.
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Rosales E, Pazos M, Longo MA, Sanroman MA. Influence of operational parameters on electro-Fenton degradation of organic pollutants from soil. J Environ Sci Health A Tox Hazard Subst Environ Eng 2009; 44:1104-1110. [PMID: 19847700 DOI: 10.1080/10934520903005111] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The combination of the Fenton's reagent with electrochemistry (the electro-Fenton process) represents an efficient method for wastewater treatment. This study describes the use of this process to clean soil or clay contaminated by organic compounds. Model soil of kaolinite clay polluted with the dye Lissamine Green B (LGB) was used to evaluate the capability of the electro-Fenton process. The effects of operating parameters such as electrode material and dye concentration were investigated. Operating in an electrochemical cell under optimized conditions while using electrodes of graphite, a constant potential difference of 5 V, pH 3, 0.2 mM FeSO(4). 7H(2)O, and electrolyte 0.1 M Na(2)SO(4), around 80% of the LGB dye on kaolinite clay was decolorized after 3 hours with an electric power consumption around 0.15 W h g(-1). Furthermore, the efficiency of this process for the remediation of a real soil polluted with phenanthrene, a typical polycyclic aromatic hydrocarbon, has been demonstrated.
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Affiliation(s)
- E Rosales
- Department of Chemical Engineering, University of Vigo, Vigo, Spain
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Chacón L, Lainez M, Rosales E, Mercado M, Caminero JA. Evolution in the resistance of Mycobacterium tuberculosis to anti-tuberculosis drugs in Nicaragua. Int J Tuberc Lung Dis 2009; 13:62-67. [PMID: 19105880] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/27/2023] Open
Abstract
SETTING Nicaragua, a country where the DOTS strategy has been successfully implemented since 1984. OBJECTIVE To estimate the prevalence and trends of Mycobacterium tuberculosis resistance to first-line anti-tuberculosis drugs. DESIGN A prospective national survey carried out in 2004 according to the standardised model developed by the World Health Organisation and the International Union Against Tuberculosis and Lung Disease. RESULTS A total of 423 M. tuberculosis strains were studied. Among the 320 strains evaluated for initial resistance, 13.1% displayed resistance to any drug, lower than the 1998 figure of 15.6%. Overall initial resistance to isoniazid (INH), rifampicin (RMP) and multidrug resistance (MDR) was respectively 6.6%, 0.9% and 0.6%. Initial resistance was higher in older age groups. Overall acquired resistance was 35.9% (n = 103); resistance to INH was 29.3% and to RMP 8.9%, while MDR was 7.9%. The acquired MDR rate was clearly higher in Category I failures (44.4%) than in relapses (3.8%) and retrieved defaulters (2.7%). All resistance rates found in this study were lower than those detected in 1998. CONCLUSION This study shows low rates of resistance and MDR and a downward trend in all rates, undoubtedly related to the proper implementation of the National Tuberculosis Programme.
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Affiliation(s)
- L Chacón
- Departamento de Micobacterias, Centro Nacional de Diagnóstico y Referencia (CNDR), Ministerio de Salud (MINSA), Managua, Nicaragua
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Abstract
The functional relationship between the ovary and immune cells is well known. The modulation of ovarian steroidogenesis in adult rats with polycystic ovary (PCO) by secretions of cultured splenocytes treated with 10 (-6) M testosterone or 10 (-6) M testosterone plus 10 (-4) M flutamide, an androgen receptor antagonist, was investigated. Polycystic ovary was induced by estradiol valerate (2 mg/rat). Polycystic ovary splenocyte secretions decreased the release of androstenedione from PCO ovaries in contrast to the effect of non-PCO splenocyte secretions. This decrease was associated with a significant decrease in androgen receptor and IL-12 mRNA expression in PCO splenocytes. When splenocytes were treated with testosterone, their conditioned media further decreased androstenedione release from the ovary and had a greater inhibitory effect on PCO ovary compared with non-PCO ovary. This effect was reversed by flutamide. Polycystic ovary splenocytes showed a decrease in IL-1 beta mRNA expression. Their secretions scarcely affected progesterone release from non-PCO ovaries but significantly stimulated progesterone release from PCO ovary by an androgen-independent mechanism. The differential steroidogenic ability of splenocyte secretions from PCO rats is associated with the IN VITRO testosterone environment. Polycystic ovary splenocytes might exert a protective action against PCO effects through their secretions by inducing a low androstenedione response from the ovary.
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Affiliation(s)
- M Forneris
- Laboratorio de Biología de la Reproducción, Facultad de Química, Bioquímica y Farmacia, Universidad Nacional de San Luis, San Luis, Argentina
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Rosales E, Fernandez-Ramirez A, Barcenas-Morales G, Montaraz-Crespo J. P1768 Pertactin evaluation as immunogen in murine model. Int J Antimicrob Agents 2007. [DOI: 10.1016/s0924-8579(07)71607-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Rosales C, Abello V, Rosales E, Esguerra H, Linares A. 266: Fludarabine – oral busulfan myeloablative conditioning for allogenic peripheral stem cell transplantation. A single center experience in Colombia. Biol Blood Marrow Transplant 2007. [DOI: 10.1016/j.bbmt.2006.12.271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Alomar D, Hodgkinson S, Abarzúa D, Fuchslocher R, Alvarado C, Rosales E. Nutritional evaluation of commercial dry dog foods by near infrared reflectance spectroscopy. J Anim Physiol Anim Nutr (Berl) 2006; 90:223-9. [PMID: 16684143 DOI: 10.1111/j.1439-0396.2005.00585.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Near infrared reflectance spectroscopy (NIRS) was used to predict the nutritional value of dog foods sold in Chile. Fifty-nine dry foods for adult and growing dogs were collected, ground and scanned across the visible/NIR range and subsequently analysed for dry matter (DM), crude protein (CP), crude fibre (CF), total fat, linoleic acid, gross energy (GE), estimated metabolizable energy (ME) and several amino acids and minerals. Calibration equations were developed by modified partial least squares regression, and tested by cross-validation. Standard error of cross validation (SE(CV)) and coefficient of determination of cross validation (SE(CV)) were used to select best equations. Equations with good predicting accuracy were obtained for DM, CF, CP, GE and fat. Corresponding values for and SE(CV) were 0.96 and 1.7 g/kg, 0.91 and 3.1 g/kg, 0.99 and 5.0 g/kg, 0.93 and 0.26 MJ/kg, 0.89 and 12.4 g/kg. Several amino acids were also well predicted, such as arginine, leucine, isoleucine, phenylalanine-tyrosine (combined), threonine and valine, with values for and SE(CV) (g/kg) of 0.89 and 0.9, 0.94 and 1.3, 0.91 and 0.5, 0.95 and 0.9, 0.91 and 0.5, 0.93 and 0.5. Intermediate values, appropriate for ranking purposes, were obtained for ME, histidine, lysine and methionine-cysteine. Tryptophan, minerals or linoleic acid were not acceptably predicted, irrespective of the mathematical treatment applied. It is concluded that NIR can be successfully used to predict important nutritional characteristics of commercial dog foods.
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Affiliation(s)
- D Alomar
- Instituto de Producción Animal, Facultad de Ciencias Agrarias, Universidad Austral de Chile, Valdivia.
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Couto SR, Rosales E, Sanromán MAA. Decolourization of synthetic dyes by Trametes hirsuta in expanded-bed reactors. Chemosphere 2006; 62:1558-63. [PMID: 16099017 DOI: 10.1016/j.chemosphere.2005.06.042] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2004] [Revised: 06/16/2005] [Accepted: 06/22/2005] [Indexed: 05/04/2023]
Abstract
The present paper studies the decolourization of different synthetic dyes (Indigo Carmine, Bromophenol Blue, Methyl Orange and Poly R-478) by the white-rot fungus Trametes hirsuta at bioreactor scale under solid-state conditions, operating with ground orange peelings as a support-substrate. Dye decolourization was performed in both batch and continuous mode. Batch cultivation led to high decolourization percentages in a short time (100% for Indigo Carmine in 3h and 85% for Bromophenol Blue in 7 h). As for continuous cultivation, different hydraulic retention times (HRT) were studied (0.8, 1, 1.5 and 3d). The highest decolourization percentages were obtained operating at a HRT of 3d, especially for the dyes Methyl Orange and Poly R-478 (81.4% and 46.9%, respectively). This is a very interesting result, since there are few studies dealing with the continuous decolourization of dyes at bioreactor scale by fungal laccases.
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Affiliation(s)
- S Rodríguez Couto
- Department of Chemical Engineering, University of Vigo, 36200 Vigo, Spain.
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Morales A, Sordia L, Rosales E, Merino M, Saldivar D, Vidal O. The Use of Misoprostol Before Office Hysteroscopy Without Anesthesia. A Comparative Study. Fertil Steril 2005. [DOI: 10.1016/j.fertnstert.2005.07.1224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Rosales E, Sordia L, Vazquez J, Iglesias J, Morales A, Castañeda M, Vidal O, Saldivar D, Merino M, Garcı́a M. Breast cancer in menopausal women with hormonal replacement therapy. ACTA ACUST UNITED AC 2004. [DOI: 10.1016/j.ics.2004.05.131] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Guthmann JP, Calmet J, Rosales E, Cruz M, Chang J, Dedet JP. Las asociaciones de pacientes y el control de la leishmaniasis en el Perú. Rev Panam Salud Publica 1998. [DOI: 10.1590/s1020-49891998000600006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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Delgadillo J, Poindron P, Krehbiel D, Duarte G, Rosales E. Nursing, suckling and postpartum anoestrus of creole goats kidding in January in subtropical Mexico. Appl Anim Behav Sci 1997. [DOI: 10.1016/s0168-1591(97)00038-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Guthmann JP, Calmet J, Rosales E, Cruz M, Chang J, Dedet JP. Patients' associations and the control of leishmaniasis in Peru. Bull World Health Organ 1997; 75:39-44. [PMID: 9141749 PMCID: PMC2486976] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
American mucocutaneous leishmaniasis is an important health problem in Peru, particularly in the mountainous Cuzco Region, where 25% of all new cases reported in 1989 were located. Cases have increased considerably since the beginning of the 1980s, when large-scale seasonal migration to endemic zones occurred, particularly the forest area of Madre de Dios, following the discovery of new gold deposits there, and the deterioration in the economic situation in Peru. Following the lack of official response from the Peruvian government, hundreds of people suffering from leishmaniasis in the Cuzco area formed self-help associations with the objective of obtaining the drugs needed to treat their disease. The major achievement of this spontaneous movement, which was supported by several public and private institutions, was to encourage sick people, particularly patients with mucosal lesions, to emerge from isolation. As a result, the prevalence and incidence of the disease have now considerably decreased in the region.
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Affiliation(s)
- J P Guthmann
- Laboratoire d'Ecologie médicale et Pathologie parasitaire, Faculté de Médecine de Montpellier, France
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Franke ED, Wignall FS, Cruz ME, Rosales E, Tovar AA, Lucas CM, Llanos-Cuentas A, Berman JD. Efficacy and toxicity of sodium stibogluconate for mucosal leishmaniasis. Ann Intern Med 1990; 113:934-40. [PMID: 2173461 DOI: 10.7326/0003-4819-113-12-934] [Citation(s) in RCA: 87] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
OBJECTIVE To determine the efficacy and toxicity of the World Health Organization's (WHO) recommended treatment for mucosal leishmaniasis: antimony, 20 mg/kg body weight per day for 28 days. DESIGN Open trial with 12-month follow-up. SETTING Inpatient unit of a regional referral hospital in a developing country. PATIENTS Twenty-nine consecutive eligible patients with culture-confirmed infection of the mucosa with Leishmania species who were otherwise healthy. Eight patients (28%) had mild to moderate disease (confined to the nasal mucosa). Twenty-one patients (72%) had severe disease (including the oropharynx as well as the nasal mucosa). INTERVENTION Antimony, 20 mg/kg body weight intravenously every day for 28 days. Patients received antimony in the form of sodium stibogluconate. MEASUREMENTS AND MAIN RESULTS Initial results of therapy were as follows: 63 of 72 lesions (88%) healed or markedly improved; all lesions were culture-negative for parasites; and 18 of 29 patients (62%) showed complete clinical and parasitologic cure of all lesions. By the 12-month follow-up examinations, however, 37 lesions had recurred, 8 new lesions had appeared, and only 8 patients (30%) showed clinical cure of all lesions. Of the 8 patients with mild to moderate disease, 6 were cured compared with only 2 of the 21 patients with severe disease. Side effects of this treatment regimen included T-wave inversion on electrocardiogram (4 patients), abnormal liver function tests (10 patients), and musculoskeletal pain (24 patients). No side effects occurred during week 1 of therapy. CONCLUSIONS The only recommended treatment for mucosal leishmaniasis is ineffective in patients with severe disease. The acceptable toxicity of the regimen suggests that longer courses of therapy with antimony, or that trials with other antileishmanial agents alone or combined with antimony be evaluated as initial therapy for this disease.
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Affiliation(s)
- E D Franke
- Naval Medical Research Institute Detachment-Peru, Lima
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Abstract
Between January 1978 and June 1985, 44 patients underwent cystectomy for clinically diagnosed superficial bladder cancer. Operative mortality was 13.6%. Early and late complications were observed in 34 and 55% patients, respectively. Clinical understaging was seen in 23%, and stage reduction in 18% of the patients. Clinical staging was correct in 59% of the patients. The mean follow-up was 40 months (range, 24-84 months). Five patients presented local recurrence (13%) of the tumor and 10 patients showed distant metastases (26%). Urethral and upper urinary tract recurrences were observed in 7 and 4 patients, respectively. Fourteen patients (39%) died of cancer after a mean follow-up of 24 months. The actuarial 5-year survival was achieved by 77% of the patients with PTo-PTa-PTis and by 67% of the patients with PT1 (p, not significant).
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Vergara R, Salas I, Rodríguez I, Rosales E, Serman F, Soto J, Torres R, Vatter C, Vega R. [Epidemiology of cerebrovascular disorders in the Eastern Metropolitan Health Service, Santiago, Chile]. Rev Med Chil 1986; 114:665-73. [PMID: 3602707] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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Toriello L, Salinas P, Contreras MC, Rosales E, Schenone H. [Chagas' disease in Chile. Urban sectors. XI. Prevalence of Chagas' infection in blood donors of the Eastern sector of the Metropolitan area of Santiago, Chile. 1985]. Bol Chil Parasitol 1985; 40:76-8. [PMID: 3939411] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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Atalah E, Rosales E, Barja I, Rutman M, Troncoso M, Lagos I. [Maternal nutrition and fetal growth: Chilean perspectives (author's transl)]. Rev Med Chil 1980; 108:351-7. [PMID: 6776602] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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Menard E, Astudillo N, Rosales E, Olguin J, Torres G, Lorca M. [Thrichinosis epidemics in Santiago, Chile (author's transl)]. Rev Med Chil 1977; 105:478-80. [PMID: 918427] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Arteaga A, Soto S, Rosales E, Ortiz CL, Ortiz MF. [Critical study of serum lipid levels as indicators of coronary risk]. Rev Med Chil 1973; 101:524-7. [PMID: 4769458] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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Arteaga A, Donoso H, Rosales E, Urteaga C, Apud E. [Relation between nutritional status and physical capacity. Study among Chilean workers]. Rev Med Chil 1971; 99:904-8. [PMID: 5139093] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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Araya H, Araya J, Valiente S, Arteaga A, Rosales E, Castro N, Boj T, Tagle MA. [Nutritional survey among 102 Chilean students]. Rev Med Chil 1970; 98:59-64. [PMID: 5455810] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Arteaga A, Valiente S, Rosales E, Urteaga C. [Vitamin A avitaminosis: a colective nutritional problem in Chile]. Bol Oficina Sanit Panam 1969; 66:200-10. [PMID: 4237245] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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Valderas R, Rosales E. [Sources of calcium in the Chilean diet and its significance in the doses of Sr 90 supplied by the organism]. Bol Oficina Sanit Panam 1967; 63:281-8. [PMID: 4241941] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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