Arsenic environmental and health issues in Uruguay: A
Transcripción
Arsenic environmental and health issues in Uruguay: A
ONE CENTURY OF THE DISCOVERY OF ARSENICOSIS IN LATIN AMERICA (1914–2014) AS2014_Book.indb i 3/15/2014 12:20:57 PM Arsenic in the Environment – Proceedings Series Editors Jochen Bundschuh Faculty of Engineering and Surveying and National Centre for Engineering in Agriculture (NCEA), The University of Southern Queensland, Toowoomba, Australia Prosun Bhattacharya KTH-International Groundwater Arsenic Research Group, Department of Sustainable Development, Environmental Science and Engineering, KTH Royal Institute of Technology, Stockholm, Sweden ISSN: 2154-6568 AS2014_Book.indb ii 3/15/2014 12:20:58 PM PROCEEDINGS OF THE 5TH INTERNATIONAL CONGRESS ENVIRONMENT, BUENOS AIRES, ARGENTINA, 11–16 MAY 2014 ON ARSENIC IN THE One Century of the Discovery of Arsenicosis in Latin America (1914–2014) As 2014 Editors Marta I. Litter Gerencia Química, Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica (CNEA), Buenos Aires, Argentina Hugo B. Nicolli Instituto de Geoquímica (INGEOQUI) and Consejo Nacional de Investigaciones Cientifícas y Técnicas (CONICET), San Miguel, Buenos Aires, Argentina Martin Meichtry & Natalia Quici Gerencia Química, Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica (CNEA), Buenos Aires, Argentina Jochen Bundschuh Faculty of Health, Engineering and Sciences & National Centre for Agriculture, The University of Southern Queensland, Toowoomba, Australia Prosun Bhattacharya KTH-International Groundwater Arsenic Research Group, Department of Sustainable Development, Environmental Science and Engineering, KTH Royal Institute of Technology, Stockholm, Sweden Ravi Naidu Cooperative Research Centre for Contamination Assessment and Remediation of the Environment (CRC-CARE), University of South Australia, Mawson Lakes, SA, Australia FM.indd iii 3/17/2014 3:28:15 PM Analysis of arsenic species in rice by HPLC-HG-AFS S.S. Farías, J.A. Londonio, Y. Morisio, P. Smichowski, R.E. Servant, R. Befani, C. Quintero, C. Temporetti, E. Díaz, A.B. Livore & E.M. Soro Processing of raw rice grains (Oryza sativa L.) influences the concentration of arsenic species in Brazilian cultivars B.L. Batista, E.S. Paula, J.M.O. Souza, G.R.M. Barcelos, A.C.C. Paulelli, G. Rodrigues, V.S. Santos, P.C. Neves, C.V. Barião & F. Barbosa Jr. Investigation of arsenic content in polished white rice (Oryza sativa L.) in Ghaemshahr city (Vahdat Center, North of Iran): Its weekly intake H.B. Malidareh, A.H. Mahvi, M. Yunesian, M. Alimohammadi, Sh. Nazmara, S.S. Hosseini, P.B. Malidareh, Z.B. Malidareh & S. Namavar Accumulation and arsenic speciation in maize crop (Zea mays) in San Luis Potosí, México L. Hinojosa-Reyes, J.M. Rosas-Castor, J.L. Guzmán-Mar, A. Hernández-Ramírez, E. Ruiz-Ruiz & J.M. Alfaro-Barbosa 452 455 458 461 Arsenic determination in whole grain industrialized and the persistence after cooking E.M. Soro, A.B. Livore, C. Liberman, F. Cattaneo, J. Colazo, S.S. Farías, J.A. Londonio & P. Smichowski 464 Soybean crop exposed to arsenic: A possible risk for the food chain? A.L. Armendariz, M.A. Talano & E. Agostini 466 Arsenic in soils, pulses and crops in a Portuguese industrial contaminated site M. Inácio, V. Pereira, E.F. da Silva & O. Neves 469 Arsenic levels in grape juice from Mendoza, Argentina E.M. Martinis & R.G. Wuilloud 472 Release of arsenic from kieselguhr used as filtration aid in the food industry M. Coelhan 474 Determination of arsenic in infusion tea cultivated in north of Iran A.R. Mesdaghinia, A.H. Mahvi, S.S. Hosseini & S. Shekoohiyan 476 Section 3: Arsenic and health 3.1 Epidemiological studies Arsenic exposure, health effects and biomarker, and treatment of arsenicosis—experience in West Bengal, India D.N. Guha Mazumder, A. Ghose, D. Deb, A. Biswas, R.N. Guha Mazumder & C. Saha 481 Arsenic environmental and health issues in Uruguay: A multidisciplinary approach N. Mañay, M. Pistón & C. Goso 485 Arsenic in the environment and its impact on human health: How safe are we? A.K. Giri 488 Pharmacodynamic study on the capacity of selenium to promote arsenic excretion in arsenicosis patients in Bangladesh M. Alauddin, E. Stekolchik, J.E. Spallholz, S. Ahmed, B. Chakraborty, G.N. George, J. Gailer, H. Ahsan & P.F. La Porte 491 Nutrients and genetic polymorphisms modify arsenic metabolism efficiency C. Hernández-Alcaraz, R.U. Hernández-Ramírez, A. García-Martínez, A.I. Burguete-García, L. López-Carrillo, M.E. Cebrián & A.J. Gandolfi 495 AS3MT genotype in South American populations and their influence on arsenic metabolism K. Engström, K. Broberg, M. Vahter, F. Harari, A.M. Ronco, J. Gardon & G. Concha 498 High level of exposure to arsenic and its influence on arsenic urinary methylated metabolites: A study from Argentina V. Olmos, J.A. Navoni & E.C.V. Lepori xiv 501 AS2014_Book.indb xiv 3/15/2014 12:21:01 PM Peacey, J.: Queen’s University, Canada Pellizzari, E.E.: Laboratorio de Microbiología, Universidad Nacional del Chaco Austral, P.R. Sáenz Peña, Chaco, Argentina Peng, L.: College of Resource and Environment, Hunan Agricultural University, Changsha, PR China Pereira, V.: GEOBIOTEC, GeoBiosciences, Geotechnologies and Geoengineering Research Center, University of Aveiro, Portugal Pereyra, S.: Instituto de Altos Estudios Sociales, Universidad Nacional de San Martín, Campus Miguelete, San Martín, Provincia de Buenos Aires, Argentina Pérez Carrera, A.: Instituto de Investigaciones en Producción Animal (INPA), CONICET, Facultad de Ciencias Veterinarias, Universidad de Buenos Aires, Buenos Aires, Argentina Pérez Coll, C.S.: Instituto de Investigación e Ingeniería Ambiental, UNSAM, San Martín, Argentina Pérez, A.L.: INQUIMAE/DQIAQF, Facultad de Ciencias Exactas, UBA, Buenos Aires, Argentina Perez, C.A.: Laboratório Nacional de Luz Síncrotron (LNLS), Campinas, Brazil Pérez, R.D.: School of Mathematics, Astronomy and Physics, (CONICET-CCT CORDOBA), National University of Cordoba, Cordoba, Argentina Pérez, Roberto D.: National University of Córdoba, Córdoba, Argentina Persson, I.: Department of Chemistry, Swedish University of Agricultural Sciences, Uppsala, Sweden Petrusevski, B.: UNESCO-IHE Institute for Water Education, Delft, The Netherlands Picado, M.: La Voz de Bagaces Association, Costa Rica, USA Picco, P.: National Technological University-Faculty of Trenque Lauquen (UTN-FRTL), Buenos Aires, Argentina Piccoli, P.: Instituto de Biología Agrícola de Mendoza (IBAM), CONICET, Mendoza, Argentina Pidustwa, V.: Quality Control Management, “Ente Regulador de Servicios Sanitarios”, Province of Santa Fe, Argentina Pineda-Chacón, G.: Centro de Investigación en Materiales Avanzados (CIMAV), Chihuahua, México Pinheiro, B.: Centre of Mineral Technology, Rio de Janeiro, Brazil Pistón, M.: Facultad de Química, Química Analítica, DEC, Universidad de la República (UDELAR), Montevideo, Uruguay Pizarro, G.E.: Department of Hydraulic and Environmental Engineering, Pontificia Universidad Católica de Chile, Santiago, Chile Plá, R.: Nuclear Chemistry Department, National Atomic Energy Commission of Argentina, Buenos Aires, Argentina Planer-Friedrich, B.: Environmental Geochemistry Group, University of Bayreuth, Germany Pope, J.: CRL Energy Ltd., Christchurch, New Zealand Pradeep, T.: DST Unit of Nanoscience and Thematic Unit of Excellence, Department of Chemistry, Indian Institute of Technology Madras, Chennai, India Pratas, J.: Faculty of Sciences and Technology, Department of Earth Sciences, University of Coimbra, Coimbra, Portugal Pratts, P.B.: Ministerio de Obras y Servicios Públicos, Ministerio de Salud & Secretaría de Recursos Hídricos, La Pampa, Argentina Promige, M.A.L.: Faculty of Animal Husbandry, Bangladesh Agricultural University, Mymensingh, Bangladesh Puente-Valenzuela, C.O.: Universidad Juárez del Estado de Durango, Gomez Palacio, Durango, México Qin, P.: College of Resource and Environment, Hunan Agricultural University, Changsha, PR China Queirolo, E.I.: Center for Research, Catholic University of Uruguay, Uruguay Queralt, Ignasi: Jaume Almera Institute, (ICTJA-CSIC), Barcelona, Spain Quevedo, H.: Centro de Ingeniería Sanitaria, Facultad de Ciencias Exactas, Ingeniería y Agrimensura, Universidad Nacional de Rosario, Argentina Quici, N.: Gerencia Química, Comisión Nacional de Energía Atómica, San Martín, Provincia de Buenos Aires, Argentina Quino, I.: Instituto de Investigaciones Químicas (IIQ), Universidad Mayor de San Andrés, La Paz, Bolivia Quiñones, O.: Aquatech Internacional SA de CV, México Quintanilla, J.: Instituto de Investigaciones Químicas (IIQ), Universidad Mayor de San Andrés, La Paz, Bolivia Quintero, C.: Facultad de Ciencias Agropecuarias, Universidad Nacional de Entre Ríos, Paraná, ER, Argentina Quinteros, E.: Instituto Nacional de Salud, Ministerio de Salud, San Salvador, El Salvador Quinteros, L.: Nuevo Hospital San Roque, Córdoba, Argentina lx AS2014_Book.indb lx 3/15/2014 12:21:11 PM One Century of the Discovery of Arsenicosis in Latin America (1914–2014) – Litter, Nicolli, Meichtry, Quici, Bundschuh, Bhattacharya & Naidu (Eds) © 2014 Taylor & Francis Group, London, ISBN 978-1-138-00141-1 Arsenic environmental and health issues in Uruguay: A multidisciplinary approach N. Mañay Cátedra de Toxicología, DEC, Facultad de Química, Universidad de la República (UDELAR), Montevideo, Uruguay M. Pistón Química Analítica, DEC, Facultad de Química, Universidad de la República (UDELAR), Montevideo, Uruguay C. Goso Departamento de Evolución de Cuencas, Facultad de Ciencias, Universidad de la República (UDELAR), Montevideo, Uruguay ABSTRACT: Geogenic As in groundwater has been recently studied in different aquifers of Uruguay. However, no background epidemiology studies are available regarding environmental population exposure. As a consequence, it was necessary to conduct scientific research in order to study arsenic as an environmental health issue in the country. This research needs have resulted in joint studies of experts from both the geosciences and biosciences. The groups have coordinated studies to assess the risks of exposure to environmental arsenic in Uruguay with common research objectives and, now, this is a matter of common interest through a multidisciplinary approach. The aim of this work is to present a review of these studies conducted in Uruguay. 1 INTRODUCTION Medical Geology is a developing discipline in Uruguay since 2005, and Arsenic (As) exposure is one of its major subjects of interest (Mañay, 2010). Geogenic As in groundwater has been recently studied in different aquifers of the country. However, no background epidemiology studies are available in regards to As environmental health impact Water consumption is led by the state drinking water supplier (OSE) with a population coverage of over 90%. The As maximum acceptable limit value for this official water provider is 20 μg/L (UNIT, 2008). On the other hand, arsenic exposure at the workplace is now been taken into account to systematically assess workers’ health risks, as new occupational legal regulations have been recently established by the Ministry of Public Health (MSP, 2009). Several laws and decrees regulate the quality of water sources and drinking water as well (Poder Legislativo, 2009). The international recommendations and Uruguayan regulations for urine are: As-Urine <35 μg/L for occupational exposed workers (ACGIH-BEI®, 2011) and 10–20 μg/L for general population (ATSDR, 2007), expressed as inorganic As plus its methylated urine species. Therefore, there is a special need for conducting research studies on arsenic as an environmental health issue in the country and to develop available analytical tools to assess As levels and its speciation in water and in urine of workers for law-abiding. All these environmental and health issues are now becoming a matter of concern in Uruguay and need to be undertaken through a multidisciplinary approach. Research teams and experts from both geosciences and biosciences have joined to face those arsenic exposure risks with common research objectives. The present work describes the main studies that have been developed in Uruguay. Several of the ongoing research studies that have been developed focusing on As geological, analytical and toxicological aspects are reviewed. 2 METHODS 2.1 As analytical and speciation methodologies Simple methodologies for routine determinations of total As and its species in water and metabolites in urine were optimized and validated by Atomic Absorption Spectrometry with Hydride Generation (HG-AAS) as available analytical tools in Uruguay. This study developed and optimized an analytical determine total As and iAs species in method to water and determined iAs as well as its methylated metabolites (MMA and DMA) in urine, to be used 485 AS2014_Book.indb 485 3/15/2014 12:26:36 PM for routine applications. The methodology was used instead of ICP-MS technique, which is not available in the country for this purposes. For the screening of toxicologically relevant species iAs—MMA—DMA, separation by means of HPLC-DAD techniques was also optimized (Mañay et al., 2011, Álvarez et al., 2012). 2.2 Presence of geogenic As in groundwater The Uruguayan groundwater uses are mainly agriculture farm, drinking, domestic and thermal— touristic. The main aquifers in the country are Guarani, Mercedes, Raigón and Chuy. The reviewed studies were performed in sedimentary aquifers sampled from 2007 on. The hydrochemical characterization (major and trace elements) was carried out by both ICP-OES and inductively coupled plasma-mass spectrometry (ICP-MS) in the Laboratory of Earth Sciences Institute “Jaume Almera” (CSIC, Barcelona, Spain) and Laboratory Act Labs (Canada). 3 RESULTS AND DISCUSSION 3.1 As analytical and speciation methodologies To evaluate the efficiency of the analytical method for determining iAs + MMA + DMA, standard additions were made of these species (in urine), and the recoveries obtained where close to 70%, which was considered adequate for a screening methodology. For urine, the detection limit obtained was 0.3 μg/L, with a precision <5% expressed as RSD. The quantification limit was 1.0 μg/L (Álvarez et al., 2012). 3.2 Presence of geogenic As in groundwater This study investigates demographic predictors of urinary arsenic in Montevideo school children. Samples of 192 children were analyzed in the Karolinska Institute in Sweden for total urinary As, iAs, and its metabolites (MMA, DMA) using high-pressure liquid chromatography with hydride generation and inductively coupled mass spectrometry, HPLC-ICP-MS (Kordas, 2012). The average and maximum concentration of total As in the Raigón Aquifer System were 14.1 μg/L and 24.19 μg/L, respectively. Out of 37 samples, only six showed concentrations below 10 μg/L of As, according to the WHO recommended limit values for drinking water (WHO, 2004). In the Raigón Aquifer System, distal (deltaic plain and delta front) sediments showed As concentrations higher than those on more proximal (fluvial) sediments in Canelones Department (Manganelli et al., 2007). All sampled rocks contained some As, typically between 1 and 5 mg/kg. There were several As bearing minerals, including arsenopyrite (AsFeS), realgar (AsS) and orpiment (As2S3). Soils, which were formed by the weathering and breakdown of rock to clays, usually contained between 0.1 and 40 mg/kg and on average 5–6 mg/kg. In this study, a few Cenozoic sediments analyzed in both Raigón and an adjacent formation (called Libertad) show normal As concentrations (between 1–6 mg/kg) (Mañay et al., 2013). The rocks in the south of the country (specifically in a location called Santa Lucia Basin) were mainly composed of granitic and gneissic suites which do not contain arsenic (Spoturno et al., 2004). This allows us not to consider a geogenic origin in this case (Mañay et al., 2013). A few sediments were analyzed in both Raigón and Libertad formations, and this allow us to postulate a tentative anthropogenic origin based in several anomalous As concentrations values out of the expected average (>7 mg/kg). Probably, the most significant anthropogenic source of arsenic in this region is from cumulative applications of arsenical pesticides and herbicides used for decades by farmers (Mañay et al., 2013). 2.5 3.3 2.3 As unexposed population background levels In Uruguay, there is no background of systematic arsenic studies on the unexposed population, although the biological control is done in workers according to the current legislation. For this reason, a pilot study to analyze arsenic in samples of urine of non-exposed population was carried out, to estimate the basal levels and its possible correlation with associate variables. 36 urine samples of voluntary adults were collected according to a designed protocol. The urine was analyzed with a routine developed methodology for toxicologically relevant As species, by means of HG-AAS. The results were statistically assessed and compared with the data previously obtained by a survey (Iaquinta et al., 2012). 2.4 Predictors of As levels in children Exposed population Urine samples from workers presumably exposed to As, in different worksites, were periodically analyzed for toxicologically relevant species in order to assess health risks according to national regulations. The total results of this routine biomonitoring were statistically assessed (Iaquinta et al., 2012). As unexposed population background levels The results of this study can be considered as the first preliminary background of As levels in urine for the not exposed adult population in Uruguay. This study showed average reference levels of 4.96 μg/L, (range 2.67–11.21 μg/L) and allowed to study the influence of several factors that could 486 AS2014_Book.indb 486 3/15/2014 12:26:36 PM affect the concentration of As-Urine. The obtained levels were within the reference limits according to ATSDR, 2007, and a significant influence of the age was observed on the concentration of As in urine as the concentration was lower as the age increased (Iaquinta et al., 2012). 3.4 Predictors of As levels in children Preliminary results showed low-level exposure to As from water and low concentrations of inorganic species in urine on a 6–8 years old children population from Montevideo. Several demographic predictors of urinary arsenic, including measures of socioeconomic status, sex, and family consumption of bottled water were identified (Kordas, 2012). 3.5 Exposed population Out of the 100 urine samples analyzed for biomonitoring of As toxicologically relevant species (iAs + MMA + DMA) none showed higher levels than those established by regulations (As-Urine <35 μg/L). The average results of this routine biomonitoring were 3.1 μg/L (range 0.3–18.8 μg/L) (Iaquinta et al., 2012). 4 CONCLUSIONS As health and environmental issues are being recently studied in Uruguay. The reviewed studies and those that are being conducted show the current status of the problem of arsenic in Uruguay which still have not been addressed as a priority health and environmental issue in the country. Therefore, it is important to continue developing systematic studies to assess population’s chronic exposure to inorganic As through drinking water, food and workplaces, focusing on children health impacts at As low levels. Besides, further studies are necessary to optimize analytical methodologies based on As speciation with coupled techniques available in Uruguay. We conclude that this multidisciplinary approach in developing As research has been very successful in creating scopes of discussion among researchers and professionals from various disciplines and institutions, to study such a relevant environmental and health topic in Uruguay. ACKNOWLEDGEMENTS To DINACYT/PDT—MEC (Uruguay), to Comisión Sectorial de Investigación Científica UDELAR (Uruguay), to Consejo Superior de Investigaciones Científicas (CSIC, Spain) and to National Institute of Environmental Health Science (NIEHS, USA). REFERENCES Álvarez, C., Pistón, M., Clavijo, G., Iaquinta, F., Bühl, V. &, Mañay, N. 2012. Avances en la optimización de un método rápido de screening de especies toxicológicamente relevantes de As y As total en orina mediante HG-AAS. 3er Encontro Brasileiro sobre Especiacao Química—EspeQBrasil, Bento Goncalves, Brasil. ACGIH, 2011 American Conference of Governmental Industrial Hygienists TLVs© and BEIs©. ATSDR2007. As Toxicological Profile in: http://www. atsdr.cdc.gov (accessed: October 2013). Iaquinta, F., Pistón, M., Álvarez, C., Gómez, M.E. & Mañay, N. Evaluación de niveles de referencia de arsénico en orina de población adulta no expuesta ocupacionalmente. Estudio preliminar. 2012. Aldeq—Anuario Latinoamericano de Educación Química, XVII: 230–234. Kordas, K. 2012 Project title: Is low-level arsenic exposure related to neurobehavioral deficits in children? Sponsor: NIEHS, R21 ES019949 (2012–2014). MSP 2009, Ministerio de Salud Pública. Ordenanza N° 145. Ref. N° 001-3-5137-2008, http://www.msp. gub.uy/sites/default/files/001-3-5137-2008._Vigilancia_sanitaria_de_trabajadores_expuestos_factores_ riesgo_laborales.doc (accessed 8-01-2014). Manganelli, A., Goso, C., Guerequiz, R., Fernández- Turiel, J.L., García-Valles, M., Gimeno, D. & Pérez, C. 2007. Groundwater arsenic distribution in South-western Uruguay. Environmental Geology, 53: 827–834. Mañay, N. 2010. Developing Medical Geology in Uruguay: A Review. Int. J. Environ. Res. Public Health 7(5): 1963–1969. Mañay, N., Pistón, M., Álvarez, C., Clavijo, G. & Gómez, E. 2011. Development of Arsenic Analytical Methodologies In Water And Urine By Hg-AAS For Routine Determinations In Uruguay. 4th International Conference On Medical Geology GEOMED. Bari—Italia. Mañay, N., Goso, C., Pistón, M., Fernández-Turiel, J.L., García-Vallés, M., Rejas, M. & Guerequiz, R. 2013. Groundwater Arsenic Content in Raigón Aquifer System (San José, Uruguay). Revista de la Sociedad Uruguaya de Geología, 18: 20–38. Poder Legislativo, 2009, Ley Nº 18.610 Política Nacional De Aguas. http://www.ose.com.uy/descargas/documentos/leyes/ley_18_610.pdf Spoturno, J., Oyhantcabal, P., Aubet, N. & Casaux, S. 2004. Mapa geológico y de recursos minerales del Departamento de San José. DINAMIGE-FCIENDINACYT. CD Rom. UNIT 2010 Instituto Uruguayo de Normas Técnicas (UNIT-BID/Fomin) Referencia 833:2008. Agua Potable: Requisitos. http://www.ose.com.uy/descargas/ Clientes/Reglamentos/unit_833_2008_.pdf (accessed 8-01-2014). WHO 2004. Guidelines for drinking-water quality. Recommendations. World Health Organization, Geneva, 3rd edition. Volume 1, 515. 487 AS2014_Book.indb 487 3/15/2014 12:26:37 PM Pellizzari, E.E. 762 Peng, L. 769 Pereira, V. 469 Pereyra, S. 900 Pérez, A.L. 670 Pérez, C.A. 172, 616 Perez, M.E.C. 708 Pérez, R.D. 172, 386 Persson, I. 278 Petrusevski, B. 157, 690 Picado, M. 909 Picco, P. 129 Piccoli, P. 339 Pidustwa, V. 906 Pineda-Chacón, G. 270 Pinheiro, B. 399 Pinter, M.I.F. 339 Pistón, M. 485 Pizarro, G.E. 56, 90, 110, 293 Plá, R. 204 Planer-Friedrich, B. 327, 559 Pontes, B.M.S. 65 Pope, J. 68 Portocarrero, E.D. 187 Pradeep, T. 13 Pratas, J. 298 Pratts, P.B. 628 Promige, M.A.L. 431 Puente-Valenzuela, C.O. 613 Qin, P. 769 Queirolo, E.I. 553, 565 Queralt, I. 637 Quevedo, H. 705 Quici, N. 802, 808 Quino, I. 239 Quiñones, O. 775 Quintanilla, J. 239 Quintero, C. 446, 449, 452 Quinteros, E. 251 Quinteros, L. 605 Quiquinto, A. 419 Raber, G. 389 Rafiqul, I. 590 Rahman, M.A. 104 Rakibuz-Zaman, M. 610 Rakotoarisoa, O. 237 Ramanathan, AL. 108 Ramila, C.dP. 90 Ramírez, A. 405 Ramos, C. 805 Ramos, O.E.R. 239 Ramos, R.G. 775 Saha, C. 481 Sales, A.M. 183 Salomón, M.V. 339 Sampayo-Reyes, A. 582 Sanchez-Palacios, J.T. 380 Sánchez-Peña, L.C. 535 Sánchez-Ramírez, B. 526 Sandoval, N.G. 514 Sandrini, R. 416 Sanguinetti, G.S. 705 Sankar, M.S. 95 Santos, M.C.B. 113, 162 Santos, V.S. 455 Saralegui, A. 738, 740 Schenone, N.F. 434 Schierano, M.C. 159 Schmidt, E. 85 Schmidt, S. 755, 780 Schulz, C. 644 Sekhar, B.M.V.S. 245 Selim, H.M. 255 SenGupta, A. 797 Sequeira, M. 85 Serce, H. 576 Sereno, L.L. 628 Servant, R.E. 446, 449, 452 Shahina 29 Shakya, S.K. 876 Shamsudduha, M. 891 Sharifi, R. 345 Shekoohiyan, S. 476 Shen, H. 646 Shengheng, H. 797 Siddique, M.N.E.A. 104 Siegfried, K. 207, 867 Sierra-Campos, E. 613 Sigrist, M. 412 Silbergeld, E.K. 622 Sileo, E.E. 699, 714 Silva, G.C. 167, 421, 607 Silva, J. 678 Silva, R.O. 258 Silva, R.S.V. 113, 162 Silva, S.A. 272 Silva, S.C. 260, 873 Silva, V. 759 Simonnot, M.O. 295 Singh, I.B. 29 Singh, J.K. 551 Singh, M. 29 Singh, S. 29 Slavkovich, V. 610, 630 Šlejkovec, Z. 291 Slokar, Y.M. 690 Raqib, R. 8 Rastelli, S.E. 318 Raychowdhury, N. 22 Reddy, K.J. 814 Regan, J.M. 90 Reina, F.D. 681, 684 Reis, A.P. 360, 585 Ren, Y. 769 Requejo, F. 805, 820 Resnick, C. 622 Resnizky, S.M. 204 Reyes, A.B. 772 Reyes, D.C.P. 363 Reyes, N.P. 187 Rial, E. 140 Ribó, A. 251 Ríos, P. 648 Risser, T. 223 Rivera-Hernández, J.R. 702 Rizzo, A. 60, 63 Robles, A.D. 145 Rodriguez, A.I. 711 Rodriguez, A.V. 711 Rodríguez, D. 543, 568 Rodríguez, D.J. 808 Rodrigues, G. 455 Rodriguez, I. 571 Rodriguez, R. 142, 571 Rodriguez-Lado, L. 46 Rojas, J. 195 Rojas, P. 853 Roldán, C.S. 637 Román, E.S. 802 Román, M.D. 640 Romero, C. 514 Romero, L. 693 Romero, L.G. 853 Romero, M.B. 145 Ronco, A.M. 498 Rosales, B.M. 318 Rosas-Castor, J.M. 461 Rosen, B.P. 309 Rosso, E. 416 Rothenberg, S.J. 622 Rousselle, P. 223 Roy, S. 610 Rozo-Correa, C.E. 197 Ruano, G. 820 Rubio-Andrade, M. 622 Rubio-Campos, B.E. 226 Ruiz-Ruiz, E. 461 Sabadini-Santos, E. 396 Safa, Z.K. 839 920 AS2014_Book.indb 920 3/15/2014 12:31:31 PM