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Sample records for tuxtlas veracruz fechamiento

  1. Diversidad y distribución de Araceae de la Reserva de la Biosfera Los Tuxtlas, Veracruz, México Diversity and distribution of Araceae of the Reserva de la Biosfera Los Tuxtlas, Veracruz, Mexico

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    Amparo Acebey

    2008-12-01

    Full Text Available Este estudio documenta la diversidad, distribución altitudinal y geografía de Araceae en la región de Los Tuxtlas, Veracruz. Se escogió un transecto altitudinal en bosque tropical perennifolio y bosque mesófilo de montaña bien conservado desde los 100 m de altitud hasta la cima del volcán San Martín Tuxtla a los 1 700 m. En cada cota altitudinal de 100 m de elevación se realizaron muestreos en 3-4 parcelas de 400 m². El listado de aráceas presentado para la región de la Reserva de la Biosfera Los Tuxtlas se basa en datos propios, complementado con información de listas publicadas, bases de datos y revisión de herbarios. Se registraron 34 especies representadas en 9 géneros, de las cuales 5 son endémicas de México. Las aráceas (hemi- epífitas representan aproximadamente el 11% de la flora epifítica de la Estación de Biología Tropical Los Tuxtlas. A lo largo del gradiente altitudinal se observó un descenso constante del número de especies respecto al incremento de la altitud. El hallazgo de 3 nuevos registros de aráceas para la región de Los Tuxtlas y el estado de Veracruz demuestran que la realización de más inventarios florísticos sería importante.This study documents the diversity, altitudinal and geographical distribution of Araceae in the region of Los Tuxtlas, Veracruz. An altitudinal transect was selected in mature tropical rain and cloud forest from 100 m elevation to the summit of the San Martín Tuxtla volcano at 1 700 m. In each range of 100 m elevation we carried out inventories of Araceae in 3-4 plots of 400 m². The list of aroids presented for the region of the Reserva de la Biosfera Los Tuxtlas is based on our own data, supplemented with information from published sources, data bases and revision of herbarium specimens. We recorded a total of 34 species in 9 genera, of which 5 are endemic to Mexico. The (hemi- epiphytic aroids represent about 11% of the epiphytic flora at the Biological Research

  2. The 1793 Eruption of San Martin Volcano (Los Tuxtlas, Veracruz, Mexico)

    Science.gov (United States)

    Espindola, J. M.; Zamora-Camacho, A.; Godinez, M. L.; Rodriguez-Elizarraras, S.

    2007-12-01

    San Martin Tuxtla Volcano is located in the State of Veracruz, Eastern Mexico (18.572N, 95.169W, 1650 masl). Its last eruption, which occurred 1793, was described by D. Jose Moziño, a naturalist sent by the Viceroy-of the then New Spain-to report on the eruption. The activity lasted for several months with distinct events of explosive character, which produced thick ash fall deposits in its vicinity. The explosions were heard, among other places, in the coasts of Tampico some 500km NW from the volcano. The ash fall reached distances up to 200 Km from the crater and covered an area of about 112,000 Km2. Following the description of Moziño and the results of field studies we make a reconstruction of the eruption. We identified the air fall deposit from this eruption and present an isopach map. We present radiocarbon ages of the paleosoils under the ash bed as an indirect evidence of its age. This data together with present day wind velocities, and a diffusion-advection model of the dispersion of ashes allow to estimate in at least 10km the altitude reached by some of the eruptive plumes. An estimation of the minimum volume of ash erupted, based on the reconstructed isopachs, is of about 1.3 x 108 m3. Microphotographs of the ashes suggest that the activity was of phreatomagmatic and strombolian nature. Finally, we address some aspects of the volcanic risk in the area derived from our study.

  3. Distribución y abundancia de Craugastor vulcani: una especie de rana en riesgo de Los Tuxtlas, Veracruz, México Distribution and abundance of Craugastor vulcani: an endangered frog species from Los Tuxtlas, Veracruz, Mexico

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    Eduardo Pineda

    2010-04-01

    Full Text Available En México, más de la mitad de las especies de anfibios están amenazadas y de la mayoría no se genera información que permita conocer el estatus en el que se encuentran sus poblaciones. En este trabajo se evaluó la distribución y abundancia de Craugastor vulcani, una rana endémica de la sierra de Los Tuxtlas Veracruz que se encuentra en riesgo de extinción, en función de la transformación de la selva. Para este trabajo, se consultaron bases de datos de registros históricos y se muestrearon 12 sitios que representan ambientes comunes de la región. Se registró un total de 524 individuos, de los cuales el 77% se encontraron en fragmentos de selva, el 20% en remanentes riparios y sólo el 3% en potreros. La mayor abundancia (62% se registró durante la época seca del año. La distribución conocida de C. vulcani está sesgada hacia el norte de la sierra, existe poca información sobre su presencia en la porción sur. La permanencia de la especie en la zona parece depender de los pocos fragmentos de bosque existentes. El aumento en el número, área y conectividad de tales remanentes son algunas de las medidas necesarias para conservar ésta y otras especies amenazadas en la región.More than a half of all amphibian species occurring in Mexico are threatened, and for most of them there is no current information to assess the status of their populations. Craugastor vulcani is an endemic frog from the Los Tuxtlas mountains, Veracruz, and it is classified as an endangered species. We examine the distribution and abundance of C. vulcani as a function of rainforest transformation in Los Tuxtlas. We consulted historical records in databases and sampled 12 sites representing common habitats of the region. We recorded a total of 524 individuals of which 77% were found in rainforest fragments, 20% were collected in riparian remnants and just 3% in cattle pastures. Most individuals (62% were recorded during the dry season. The known distribution

  4. Las Islas de los Changos (the Monkey Islands): the economic impact of ecotourism in the region of Los Tuxtlas, Veracruz, Mexico.

    Science.gov (United States)

    Serio-Silva, Juan Carlos

    2006-05-01

    This study evaluates the popularity and economic impact of Las Islas de los Changos (the Monkey Islands) as an ecotourism site on Lake Catemaco in the Los Tuxtlas region of Veracruz, Mexico. Two small island colonies of exotic primates, stumptail macaques (Macaca arctoides), have proved to be highly beneficial for the local economy as the main attraction for tourists in this region. From July 1991 to June 1992, data were collected on the number of tourists who took boat trips to visit the primates, and the amount of money spent on tours to the islands. The data suggest that at least 28,470 passengers visit these primate troops annually and spend approximately 88,970 U.S. dollars (USD). Follow-up questionnaires during July 1997 to June 2000 to hotelkeepers and tourist boat operators identified the Monkey Islands as the primary destination for tourists to this region. A comparison of the net income obtained by local ecotourism operators with wages earned through other types of employment in the Los Tuxtlas region, such as working in natural reserves, agriculture, or renting grazing land for cattle, show the relative importance of Las Islas de Los Changos in sustaining the local economy. 2005 Wiley-Liss, Inc.

  5. Medio socioambiental y ecoturismo en la Reserva de la Biosfera de Los Tuxtlas (Veracruz, México: una posible nueva alternativa al desarrollo

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    Jesús Moreno Arriba

    2017-01-01

    Full Text Available Desde un enfoque de trabajo transdisciplinar que conjuga métodos y técnicas característicos de la investigación geográfica y antropológica (geoantropología, en este artículo se ha constatado, documentado y analizado un proyecto no gubernamental de prácticas socioespaciales alternativas para la gestión de recursos ecoturísticos en la región de Los Tuxtlas y la Sierra de Santa Marta (Veracruz, México. Frente al modelo de desarrollo productivista y paternalista de las políticas públicas mexicanas y veracruzanas -que ha originado un grave deterioro del medio socioambiental-, estas experiencias, emanadas del ambientalismo social mexicano, se presentan como ejemplos de buenas prácticas para construir un nuevo modelo de desarrollo capaz de contribuir al mejoramiento de la precaria situación actual -ecológica, demográfica y socioeconómica- de las comunidades indígenas campesinas.

  6. Valoración del servicio ambiental hidrológico en el sector doméstico de San Andrés Tuxtla, Veracruz, México

    OpenAIRE

    Ana Lid del Ángel Pérez; Andrés Rebolledo Martínez; José Alfredo Villagómez Cortés; Rigoberto Zetina Lezama

    2009-01-01

    Entre las iniciativas de conservación en México, existe un programa de pago por servicios ambientales en áreas de gran importancia por sus valores ecológicos. Un caso es el de San Andrés Tuxtla, Veracruz, donde el pago no representa una opción económica sostenible a los dueños de predios, por lo que deberá incorporarse también el reconocimiento social. El objetivo del trabajo fue obtener el valor del bosque y paisajes alternativos en la población que recibe sus beneficios en forma de agua. Se...

  7. Flows correlation of the Tuxtlas, Veracruz volcanic field. Dating by TL of ceramics found in leakages of the San Martin volcano; Correlacion de flujos del campovolcanico de los Tuxtlas, Veracruz. Fechamiento por TL de ceramicas encontradas en derrames del volcan San Martin

    Energy Technology Data Exchange (ETDEWEB)

    Ramirez, A.; Schaaf, P.; Espindola, J.M. [Instituto de Geofisica, UNAM, 04510 Mexico D.F. (Mexico); Zamora, A. [Posgrado en Ciencias de la Tierra, UNAM (Mexico)

    2006-07-01

    In this work the age estimation carried out to archaeological ceramics found inside the spills and one ash deposit both of the San Martin volcano. The technique used for its processing was that of fine grain (4-11 {mu}m). The paleodosis it was calculated using the additive method for the determination of the equivalent dose (Q) and the regenerative method for the determination of the factor by supralineality (l). The samples of ceramic were processed like total sample. In the case of the geologic sample (ash sample) one carries out the separation of minerals in particular glasses at 95% of purity. For the determination of the annual dose rate its were carried out in the place of sampling measurements with a gamma spectrometry equipment, with it the determinations of Uranium, thorium and potassium were obtained, besides the cosmic contribution. Once having both elements (paleodosis and annual dose rate) it was calculated the age of the samples and consequently of the flows, which were stratigraphically correlated. (Author)

  8. Conflictos Por La Apropiación De Los Recursos Locales Y Cambio Institucional Endógeno. Las Luchas Por El “Parcelamiento Convencional” En Los Ejidos De Los Tuxtlas, Veracruz, México

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    Eric Léonard

    2015-12-01

    Full Text Available Resumen: Este artículo examina los procesos de cambio institucional endógeno que ocurrieron en los ejidos de Los Tuxtlas, una región indígena del sur del estado de Veracruz, en México, en las décadas de 1950 a 1980. Estos cambios en las reglas de acceso y uso de las tierras ocurrieron a raíz de conflictos internos a las comunidades campesinas que tenían por motivo común los acaparamientos de recursos naturales (tierras de cultivo, pastizales y maderas realizados por grupos de actores locales, con la anuencia del aparato politico-sindical oficial. Estos conflictos se expresaron en reivindicaciones de “parcelamiento” –es decir de redistribución de la tierra en una base igualitaria– que formularon varios comités agrarios locales, a las que se opusieron los intermediarios político-comerciales locales aliados a la población sin derecho formal a las tierras de reparto agrario. Fue hasta fines de los años setenta, en un contexto de fuerte intervención estatal en los ámbitos productivo y comercial, cuando un cambio generacional dentro de la dirección del comité y a nivel de los ejidos, abrió la puerta a la realización de los parcelamientos en varias comunidades. El estudio de caso presenta la cuestión de los acaparamientos de recursos dentro de las comunidades campesinas, no como un fenómeno novedoso y relacionado con las dinámicas contemporáneas de mercantilización y globalización, sino como procedente, también, de lógicas y dinámicas de diferenciación internas a dichas comunidades. Palabras claves: reforma agraria; ejido; cambio institucional; conflictos; normas locales; pluralismo legal *** Summary: This paper deals with the issue of endogenous institutionnal change, examining social and legal processes which occured in the mexican ejidos of the Tuxtla region, in the South of Veracruz state, betweeen the decades of 1950 and 1980. These changes regarding the rules of access to and use of land occured as the output

  9. Veracruz, México

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    E. López-Sánchez

    2007-01-01

    Full Text Available El presente trabajo establece las bases para la instrumentación de plantaciones forestales comerciales (PFC por medio de sistemas agroforestales (SAF como alternativa para un sistema de producción sustentable. Propone los estándares para el diseño, establecimiento y manejo de los principales sistemas agroforestales con referencia a la región de Los Tuxtlas, Veracruz, que incluyen dentro de sus componentes arbóreos cedro rojo (Cedrela odorata L., cedro nogal (Juglans pyriformis Liebm. y primavera (Roseodendron donnell-smithii (Rose Miranda en combinación con maíz, cacahuate y café, los principales cultivos agrícolas de la región. El desarrollo actual de las plantaciones forestales comerciales y la experiencia desarrollada determina las combinaciones agroforestales como una opción técnica viable. La evaluación financiera de los SAF muestra ganancias tres y cinco veces mayores del cedro rojo sobre la primavera ($1’600,000.00 vs $500,000.00 y sobre el cedro nogal ($1’600,000.00 vs $300,000.00 respectivamente; los indicadores financieros TIR, VAN y R B/C respaldan estos dividendos. La rentabilidad de los cultivos agrícolas en un periodo similar al de las plantaciones agroforestales arrojan cifras negativas; el establecimiento conjunto de las especies agrícolas y forestales produce una sinergia positiva financiera.

  10. Water radiological sanitary control of Veracruz State

    International Nuclear Information System (INIS)

    Carreon G, E.; Vazquez C, J. A.; Aguilar P, M. del C.; Parissi C, A.

    2014-10-01

    This work is carried out in Veracruz State covering over 11 jurisdictions of the State (Panuco, Tuxpan, Poza Rica, Martinez de la Torre, Xalapa, Cordoba, Orizaba, Veracruz, Cosamaloapan, San Andres Tuxtla and Coatzacoalcos). The sampling was realized in a period from 2009 to 2013 analyzing home drinking water, supply sources and wells, the sampling was done by the sanitary checkers of different jurisdictions with approved methods and the methodology was validated at the State Laboratory of Public Health. 1637 samples were analyzed by counting equipment Tennelec Canberra series 5 and a gas supply system P-10 with calibration curves for alpha and gross beta. The results of measurements ranging from 0.07 to 0.25 Bq/L in the activity concentration gross alpha annual average, an gross beta were from 0.12 to 0.17 Bq/L in the activity concentration gross beta annual average, and with a concentration range of alpha activity up to 0.62 and a minimum 0.02, and the concentration of beta activity of a maximum value 1.54 and a minimum 0.02, taking also as resulted in five years of analysis only 1.16% of the analyzed samples (19 samples) showed a value of alpha activity concentration above the minimum detectable concentration and 62.43% (1022 samples) of the analyzed samples showed a value of beta activity concentration above the minimum detectable concentration, is also clear that the results of the sanitary jurisdictions of Panuco and Tuxpan not have corresponding activity values for the years 2009, 2011-2013 except 2010. We can conclude that the regular measurements of alpha and gross beta activity in water are invaluable for timely detection of radioactive contamination. (Author)

  11. Reforma agraria y violencia campesina en Catemaco, Veracruz (México), 1921-1958

    OpenAIRE

    Rogelio Jiménez Marce

    2015-01-01

    El objetivo de este artículo es mostrar las gestiones que los campesinos de Catemaco,Veracruz, una de las poblaciones que conformaban el Cantón de los Tuxtlas, hicieronante las autoridades agrarias para tratar de obtener tierras. El proceso resultó sumamenteconflictivo como consecuencia de diversos hechos: el conflicto que se generó entredos grupos de campesinos, desde el mismo inicio del proceso, por obtener la direccióndel comité agrario; las alianzas que los dos grupos establecieron con ac...

  12. Migración y ecoturismo en la Reserva de la Biosfera de Los Tuxtlas (México

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    Ángeles Piñar Álvarez

    2011-04-01

    Full Text Available In 1988, in response to the deteriorating state of its natural resources, the Los Tuxtlas Biosphere Reserve (LTBR is established in the Mexican state of Veracruz. Included within park boundaries are municipalities characterized by a high poverty rate and whose residents, due to restrictions placed on their traditional farming activities, have had to immigrate to the United States. At the same time, the biosphere reserve’s natural wealth has inspired environmentally friendly ecotourism initiatives. The purpose of our research was to analyze the relationship between migration and ecotourism in three communities located within park boundaries. We found that private and community-operated ecotourism businesses can provide inhabitants with adequate employment which in turn strengthens their ties to the community and reduces the need for them to emigrate away for financial reasons.

  13. August 1973 Veracruz, Mexico Images

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — South of Veracruz, southeastern Mexico. Damage: Severe. The earthquake caused heavy damage in the states of Morelos, Puebla, and Veracruz. Thousands were left...

  14. Water radiological sanitary control of Veracruz State; Control sanitario radiologico de agua del Estado de Veracruz

    Energy Technology Data Exchange (ETDEWEB)

    Carreon G, E.; Vazquez C, J. A.; Aguilar P, M. del C.; Parissi C, A., E-mail: eulaliacarreon@gmail.com [Laboratorio Estatal de Salud Publica, Eucalipto Mza. 12, Lote 7, Corredor Industrial Bruno Pagliai, 91697 Veracruz (Mexico)

    2014-10-15

    This work is carried out in Veracruz State covering over 11 jurisdictions of the State (Panuco, Tuxpan, Poza Rica, Martinez de la Torre, Xalapa, Cordoba, Orizaba, Veracruz, Cosamaloapan, San Andres Tuxtla and Coatzacoalcos). The sampling was realized in a period from 2009 to 2013 analyzing home drinking water, supply sources and wells, the sampling was done by the sanitary checkers of different jurisdictions with approved methods and the methodology was validated at the State Laboratory of Public Health. 1637 samples were analyzed by counting equipment Tennelec Canberra series 5 and a gas supply system P-10 with calibration curves for alpha and gross beta. The results of measurements ranging from 0.07 to 0.25 Bq/L in the activity concentration gross alpha annual average, an gross beta were from 0.12 to 0.17 Bq/L in the activity concentration gross beta annual average, and with a concentration range of alpha activity up to 0.62 and a minimum 0.02, and the concentration of beta activity of a maximum value 1.54 and a minimum 0.02, taking also as resulted in five years of analysis only 1.16% of the analyzed samples (19 samples) showed a value of alpha activity concentration above the minimum detectable concentration and 62.43% (1022 samples) of the analyzed samples showed a value of beta activity concentration above the minimum detectable concentration, is also clear that the results of the sanitary jurisdictions of Panuco and Tuxpan not have corresponding activity values for the years 2009, 2011-2013 except 2010. We can conclude that the regular measurements of alpha and gross beta activity in water are invaluable for timely detection of radioactive contamination. (Author)

  15. Opportunities at Geoscience in Veracruz

    Science.gov (United States)

    Welsh-Rodríguez, C.

    2006-12-01

    The State of Veracruz is located in the central part of the Gulf of Mexico. It has enormous natural, economic and cultural wealth, is the third most populous state in Mexico, with nearly 33 % of the nation's water resources. It has an enormous quantity of natural resources, including oil, and is strategically located in Mexico. On one hand, mountains to the east are a natural border on the other lies the Gulf of Mexico. Between these two barriers are located tropical forests, mountain forests, jungles, wetlands, reefs, etc., and the land is one of the richest in biodiversity within the Americas. Veracruz, because of its geographical characteristics, presents an opportunity for research and collaboration in the geosciences. The region has experienced frequent episodes of torrential rainfalls, which have caused floods resulting in large amounts of property damage to agriculture, housing, infrastructure and, in extreme situations, loss of human life. In 2004 Veracruz University initiated a bachelor degree in Geography, which will prepare professionals to use their knowledge of geosciences to understand and promote integrated assessment of the prevailing problems in the State. Along with the geography program, the Earth Science Center offers other research programs in seismology, vulcanology, climatology, sustainable development and global change. Because of these characteristics, Veracruz is an optimal environment for active research in the geosciences, as well as for sharing the results of this research with educators, students, and all learners. We look forward to facilitating these efforts in the coming years.

  16. Peasant coffee in the Los Tuxtlas Biosphere Reserve, Mexico: A critical evaluation of sustainable intensification and market integration potential

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    Anne Cristina de la Vega-Leinert

    2016-12-01

    Full Text Available Abstract Production of low-input, shaded coffee in the Los Tuxtlas UNESCO Biosphere Reserve (LTBR, Veracruz, Mexico, an economically marginalized but ecologically rich region, was strongly affected by the collapse in international prices and the reconfiguration of the Mexican coffee sector in the 1990s. This place-based study used qualitative methods to investigate local strategies to reactivate coffee cultivation and improve market integration. Ninety-five producers, processors and cooperative representatives were interviewed to: 1 characterize the different actors in the local coffee commodity chain; 2 explore how producers, organized or not, shape and are constrained by the local coffee sector, and 3 evaluate whether producers land use strategies may be compatible with conservation in the LTBR. We combine the Land Sparing and Sharing framework with the UNESCO Biosphere Reserve zonation system to conceptualize how coffee plantations can be spatially integrated in protected areas and facilitate synergies between local livelihoods and conservation. Our empirical study illustrates the complexity and dynamism of the LTBR coffee sector. It highlights the resourcefulness of producers in adapting their cultivation systems, but also the narrow maneuvering room farmers have to exploit textbook synergies between conservation and fair trade and / or certified organic markets. In principle, coffee cultivation can be expanded and intensified without affecting remaining primary forest (Land Sparing and contribute to maintain a diverse landscape matrix in productive agroforestry systems (Land Sharing. However, few producers have the means required to successfully achieve profitable and long-term market integration. Future research on sustainable land use management in, and around, protected areas needs to explicitly address local, sectoral and market dynamics as drivers of land use at the local level. Although these dynamics may create windows of opportunity

  17. Desplazamientos de la iguana verde, Iguana iguana (Squamata: Iguanidae) durante la estación seca en La Palma, Veracruz, México

    OpenAIRE

    Morales-Mávil, Jorge E; Vogt, Richard C; Gadsden-Esparza, Héctor

    2007-01-01

    Usamos radiotransmisores para determinar los desplazamientos de la iguana verde (Iguana iguana) en el periodo de anidación (febrero-julio) en La Palma, Los Tuxtlas, Veracruz, México (18°33’ N, 95°03’ W). Las iguanas fueron radiolocalizadas entre 23 y 30 ocasiones, principalmente en árboles (56 % entre 3-9 m); sólo 4 % fueron localizadas en el suelo. El tamaño del ámbito hogareño de machos y de hembras fue similar (9 158.06±3 025.3 m² vs. 6 591.24±4 001.1 m², respectivamente; t= 0.51, p>0.05)....

  18. Reforma agraria y violencia campesina en Catemaco, Veracruz (México, 1921-1958

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    Rogelio Jiménez Marce

    2015-01-01

    Full Text Available El objetivo de este artículo es mostrar las gestiones que los campesinos de Catemaco,Veracruz, una de las poblaciones que conformaban el Cantón de los Tuxtlas, hicieronante las autoridades agrarias para tratar de obtener tierras. El proceso resultó sumamenteconflictivo como consecuencia de diversos hechos: el conflicto que se generó entredos grupos de campesinos, desde el mismo inicio del proceso, por obtener la direccióndel comité agrario; las alianzas que los dos grupos establecieron con actores políticoscomo el Ayuntamiento, la guerrilla agraria y las autoridades estatales y nacionales,alianzas que contribuyeron a modificar el balance de poder; y los actos en los queestuvo involucrado un ingeniero de la Comisión Nacional Agraria, destacado en lapoblación, mismos que provocarían un enfrentamiento armado entre los ejidatarios deCatemaco y de Maxacapan. La conflictiva situación entre las dos poblaciones tendríauna resolución inesperada: la disgregación de una porción del territorio catemaquense.

  19. FARMING AND CATASTROPHE AT LA JOYA: A CONSIDERATION OF AGRICULTURAL INTENSIFICATION AND RISK IN THE FORMATIVE SIERRA DE LOS TUXTLAS (Agricultura y catástrofe en La Joya: un examen de la intensificación agrícola y riesgo en el período Formativo de la Sierra de los Tuxtlas

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    Amber M. VanDerwarker

    2009-03-01

    Full Text Available This paper examines the process of agricultural intensification as it occurred during the Formative period (1400 BC-AD 300 along the southern Gulf Coast of Mexico. Over the course of two millennia, rural villagers living in the Olmec hinterland of the Sierra de los Tuxtlas invested more time and labor into farming activities as they became increasingly sedentary and dealt with episodic volcanic eruptions and ash fall. This period of time witnessed the development of a regional political hierarchy in the Tuxtlas, which also had consequences for village-level subsistence. In examining agricultural intensification in the context of volcanic catastrophe and political development, I analyze archaeological plant and animal data from the site of La Joya, a farming village located in southern Veracruz, Mexico spanning the Formative period. The subsistence data indicate that maize intensification was a long, incremental process that began in the Middle Formative period, hundreds of years before political development and the establishment of a regional center. At the close of the Late Formative period, after the region's political consolidation, a severe volcanic eruption blanketed the region with ash, leading to significant, if temporary, environmental circumscription. La Joya villagers responded to this catastrophe by intensifying maize production on infields and expanding their hunting and fishing territories to exploit a wider range of animal prey. ESPAÑOL: Este estudio examina el proceso de sedentarización, intensificación agrícola y desarrollo de una jerarquía política regional durante el período Formativo (1400 a. C.-300 d. C. a lo largo de la costa meridional del Golfo de México, en la zona olmeca de la Sierra de los Tuxtlas. Los resultados obtenidos analizando los datos de animales y plantas provenientes del sitio de La Joya, un pueblo agrícola ubicado en el sur de Veracruz (México que abarca todo el Formativo, indican que la

  20. [Displacements of the green iguana (Iguana iguana) (Squamata: Iguanidae) during the dry season in La Palma, Veracruz, Mexico].

    Science.gov (United States)

    Morales-Mávil, Jorge E; Vogt, Richard C; Gadsden-Esparza, Héctor

    2007-06-01

    The green iguana (Iguana iguana) is said to be primarily sedentary, although the females travel long distances to nest. Displacement patterns must be known to help predict the effects of environmental disturbance on iguanas' survival. We studied nesting season (February-July) movements in La Palma, Los Tuxtlas, Veracruz, Mexico (18 degrees 33' N, 95 degrees 03' W). Individual movements and activity were monitored by radio tracking. The transmitters were implanted surgically in eight adult iguanas (four males and four females). Snout vent length (SVL) was used to determine the relationship between size of the body and size of home range. To estimate the size of home range, three or more points were used. Minimum convex polygons estimates of home range were calculated with McPAAL. The iguanas were radio-located between 23 and 30 occasions, mainly in trees (56% between 3-9 m); only 4% were localized under a height of 3 m (forest floor). The occupation area mean was larger for males (9,158.06+/-3,025.3 m2 vs. 6,591.24+/-4,001.1 m2) although the differences were not significant (t= 0.51, p>0.05). SVL was correlated with home range (r= 0.76; gl= 7; piguanas use the riparian vegetation for foraging. The females display two strategies for nesting: 1) moving to the sandy area near the sea or, 2) laying eggs near the river, in loam. Iguanas responded to habitat fragmentation and reduction by modifying their nesting strategy.

  1. 75 FR 51243 - Trade Mission to the Port of Veracruz

    Science.gov (United States)

    2010-08-19

    ..., just next to the current port location. This project was listed as a strategic priority in the National...: --Pre-travel webinar briefing, covering Mexican business practices and security. --Welcome kit with.... --Transportation between Mexico City and Veracruz, by bus. --Lunch with Veracruz industry leaders. --Networking...

  2. Veracruz State Preliminary Greenhouse Gases Emissions Inventory

    Science.gov (United States)

    Welsh Rodriguez, C.; Rodriquez Viqueira, L.; Guzman Rojas, S.

    2007-05-01

    on the press the year 2000, both published by the National Institute of Ecology of the SEMARNAT. There is not an emissions inventory of Veracruz, the few measurements campaigns that have been done in urban centers, it has not been possible to have access data, neither it has been designed a public politic that suggests the necessity of counting on information on the matter. In spite of it, because of the geographic conditions of Veracruz, the potential impact will transform Veracruz in a short period of time, that’s why the Veracruz University must leadership studies around it, where the social distribution of the obtained results will make possible the creation of politics, strategies directed to a sustainable development, economically viable, socially fair and environmentally respectful.

  3. Consequences of habitat fragmentation on genetic structure of Chamaedorea alternans (Arecaceae) palm populations in the tropical rain forests of Los Tuxtlas, Veracruz, Mexico

    OpenAIRE

    Peñaloza-Ramírez, Juan Manuel; Aguilar-Amezquita, Bernardo; Núñez-Farfán, Juan; Pérez-Nasser, Nidia; Albarrán-Lara, Ana Luisa; Oyama, Ken

    2016-01-01

    Abstract: Chamaedorea alternans is a palm species that has suffered from selective extraction, and habitat loss. We collected 11 populations from fragmented and conserved forest. We assess genetic variation of C. alternans, genetic exchange, differentiation, bottlenecks, effective population size and signals of natural selection. Genetic diversity was higher in conserved than in fragmented forest but not significant. Fragmentation did not play a significant role in genetic diversity, possibly...

  4. Flows correlation of the Tuxtlas, Veracruz volcanic field. Dating by TL of ceramics found in leakages of the San Martin volcano

    International Nuclear Information System (INIS)

    Ramirez, A.; Schaaf, P.; Espindola, J.M.; Zamora, A.

    2006-01-01

    In this work the age estimation carried out to archaeological ceramics found inside the spills and one ash deposit both of the San Martin volcano. The technique used for its processing was that of fine grain (4-11 μm). The paleodosis it was calculated using the additive method for the determination of the equivalent dose (Q) and the regenerative method for the determination of the factor by supralineality (l). The samples of ceramic were processed like total sample. In the case of the geologic sample (ash sample) one carries out the separation of minerals in particular glasses at 95% of purity. For the determination of the annual dose rate its were carried out in the place of sampling measurements with a gamma spectrometry equipment, with it the determinations of Uranium, thorium and potassium were obtained, besides the cosmic contribution. Once having both elements (paleodosis and annual dose rate) it was calculated the age of the samples and consequently of the flows, which were stratigraphically correlated. (Author)

  5. Nesting of Morelet’s crocodile, Crocodylus moreletii (Dumeril and Bibron), in Los Tuxtlas, Mexico

    OpenAIRE

    A. Villegas; G. D. Mendoza; J. L. Arcos-García; V. H. Reynoso

    2017-01-01

    Abstract We evaluated the nesting by Crocodylus moreletii in Lago de Catemaco, Veracruz, southeastern, Mexico. During the nesting and hatching seasons, we searched for nests along the northern margins of the lake and small associated streams. We investigated egg mortality by weekly monitoring each of the nests found, recording sign of predation (tracks and holes dug into the nest) and the effect of water level fluctuations. We not found differences to nest between inland or flooded zones. How...

  6. Effectiveness of native arbuscular mycorrhiza on the growth of four tree forest species from the Santa Marta Mountain, Veracruz (Mexico)

    Energy Technology Data Exchange (ETDEWEB)

    Retama-Ortiz, Y.; Ávila-Bello, C.H.; Alarcón, A.; Ferrera-Cerrato, R.

    2017-11-01

    Aim of the study: The aim of this work was to isolate consortia of arbuscular mycorrhizal fungi (AMF) associated to Liquidambar styraciflua in soils of the Santa Marta Mountain in Veracruz, and to select highly effective mycorrhizal consortia on promoting the growth of four tree forest species with economic and ecological importance. Area of study: Santa Marta Mountain, inside the buffer area of the Los Tuxtlas Biological Reserve in Veracruz (México). Materials and methods: Ten composite samples of rhizosphere soil were collected from L. styraciflua trees of 13-15 cm DBH (diameter at breast height). Roots were fixed in FAA solution to determine the mycorrhizal colonization percentage, the abundance of morphospecies, and its effectiveness in promoting the growth of L. styraciflua, Terminalia amazonia, Cordia alliodora, and Cojoba arborea. Soil physical and chemical characteristics were also analysed, and soil type recognition was performed with the Reference Base for Soil FAO-ISRIC World-SICS. Mycorrhizal colonization was determined by the method of clearing and staining roots with trypan blue; total percentage of colonization was estimated by the Linderman-Biermann method. Spores were extracted for counting and identifying morphospecies from each soil sample, those with more effectiveness were selected and inoculated in the four tree species, based upon a completely random design there were evaluated height, number of leaves, total dry weight and foliar area. Main results: Average mycorrhizal colonization percentage was 45% from natural conditions, samples one and four showed 80% of AMF-colonization. Average number of spores was 617 in 100 g-1 of dry soil. Forty-seven AMF-morphospecies were identified. After eight months significant differences were observed in root colonization, height, number of leaves, total dry weight, leaf area and foliar analysis of N5+, P5+ and K+ on plants inoculated with rhizosphere samples of L. styraciflua. Terminalia amazonia and

  7. Effectiveness of native arbuscular mycorrhiza on the growth of four tree forest species from the Santa Marta Mountain, Veracruz (Mexico)

    International Nuclear Information System (INIS)

    Retama-Ortiz, Y.; Ávila-Bello, C.H.; Alarcón, A.; Ferrera-Cerrato, R.

    2017-01-01

    Aim of the study: The aim of this work was to isolate consortia of arbuscular mycorrhizal fungi (AMF) associated to Liquidambar styraciflua in soils of the Santa Marta Mountain in Veracruz, and to select highly effective mycorrhizal consortia on promoting the growth of four tree forest species with economic and ecological importance. Area of study: Santa Marta Mountain, inside the buffer area of the Los Tuxtlas Biological Reserve in Veracruz (México). Materials and methods: Ten composite samples of rhizosphere soil were collected from L. styraciflua trees of 13-15 cm DBH (diameter at breast height). Roots were fixed in FAA solution to determine the mycorrhizal colonization percentage, the abundance of morphospecies, and its effectiveness in promoting the growth of L. styraciflua, Terminalia amazonia, Cordia alliodora, and Cojoba arborea. Soil physical and chemical characteristics were also analysed, and soil type recognition was performed with the Reference Base for Soil FAO-ISRIC World-SICS. Mycorrhizal colonization was determined by the method of clearing and staining roots with trypan blue; total percentage of colonization was estimated by the Linderman-Biermann method. Spores were extracted for counting and identifying morphospecies from each soil sample, those with more effectiveness were selected and inoculated in the four tree species, based upon a completely random design there were evaluated height, number of leaves, total dry weight and foliar area. Main results: Average mycorrhizal colonization percentage was 45% from natural conditions, samples one and four showed 80% of AMF-colonization. Average number of spores was 617 in 100 g-1 of dry soil. Forty-seven AMF-morphospecies were identified. After eight months significant differences were observed in root colonization, height, number of leaves, total dry weight, leaf area and foliar analysis of N5+, P5+ and K+ on plants inoculated with rhizosphere samples of L. styraciflua. Terminalia amazonia and

  8. Flooding experience at Veracruz: not only a natural disaster

    Science.gov (United States)

    Welsh-Rodriguez, C. M.; Nava Bringas, M.; Ochoa Martinez, C.; Local; regional impacts of global change

    2013-05-01

    The Veracruz state lies on the middle of the Gulf of Mexico in Mexican Republic; has a surface of 72815 Km2 represent almost the 4% of Mexico. Due to the complex topography, the rainfall, runoff and the extreme weather the 33% of Mexican water goes trough Veracruz, and every year the presence of tropical depressions, tropical storms and hurricanes impacts on the habitants of Veracruz (7.5 millions). For Veracruz the Sierra Madre is the natural border on the West and on the East the Gulf of Mexico. It is located from 17°10' to 23°38' (N) and between 93° to 99° (W). We will try to get the find out the primary information source for the floods on 2005 and 20010 and correlate with the laws on environment and civil protection for Veracruz. In 1999 a tropical depression more than 200 000 persons and more than 20 died, in 2005 Stan hurricane affected more than a million persons but no one died. In 2010 the effects of hurricane Karl were similar but a few days after the tropical depression Mathew affected 150 000 persons more and 15 people died. The patterns of people habitat in Veracruz since middle of XX century follows the oil industry develop at south east Mexico, so the risk increased as the population density increased, that's a critical reason to concluded that is not only cause - effect issue on Veracruz. So if the extreme events increase as consequence of the climate variability and climate change the vulnerability on this region will not be address in prevention policies, and the future scenario on adaptation will be a deep complex problem to solve from all perspectives.Reported impactst; Extreme events. Data from Veracruz Government.

  9. Desplazamientos de la iguana verde, Iguana iguana (Squamata: Iguanidae durante la estación seca en La Palma, Veracruz, México

    Directory of Open Access Journals (Sweden)

    Jorge E Morales-Mávil

    2007-06-01

    Full Text Available Usamos radiotransmisores para determinar los desplazamientos de la iguana verde (Iguana iguana en el periodo de anidación (febrero-julio en La Palma, Los Tuxtlas, Veracruz, México (18°33’ N, 95°03’ W. Las iguanas fueron radiolocalizadas entre 23 y 30 ocasiones, principalmente en árboles (56 % entre 3-9 m; sólo 4 % fueron localizadas en el suelo. El tamaño del ámbito hogareño de machos y de hembras fue similar (9 158.06±3 025.3 m² vs. 6 591.24±4 001.1 m², respectivamente; t= 0.51, p>0.05. Se encontró una correlación significativa entre la LHC y el ámbito hogareño (r= 0.76, gl= 7, pDisplacements of the green iguana (Iguana iguana (Squamata: Iguanidae during the dry season in La Palma, Veracruz, Mexico. The green iguana (Iguana iguana is said to be primarily sedentary, although the females travel long distances to nest. Displacement patterns must be known to help predict the effects of environmental disturbance on iguanas’ survival. We studied nesting season (February-July movements in La Palma, Los Tuxtlas, Veracruz, Mexico (18°33’ N, 95°03’ W. Individual movements and activity were monitored by radio tracking. The transmitters were implanted surgically in eight adult iguanas (four males and four females. Snout vent length (SVL was used to determine the relationship between size of the body and size of home range. To estimate the size of home range, three or more points were used. Minimum convex polygons estimates of home range were calculated with McPAAL. The iguanas were radio-located between 23 and 30 occasions, mainly in trees (56 % between 3-9 m; only 4 % were localized under a height of 3 m (forest floor. The occupation area mean was larger for males (9 158.06±3 025.3m² vs. 6 591.24±4 001.1 m² although the differences were not significant (t= 0.51, p>0.05. SVL was correlated with home range (r= 0.76; gl= 7; p<0.05. Breeding males defended their home range vigorously against other adult males. We observed one

  10. Sistema penal acusatorio en Veracruz/Adversarial criminal system in Veracruz

    Directory of Open Access Journals (Sweden)

    Jorge Alberto Pérez Tolentino (México

    2014-01-01

    Full Text Available El estudio y comprensión del nuevo Código de Procedimientos Penales de Veracruz resulta ineludible, en virtud de las nítidas diferencias existentes entre las figuras jurídicas que contiene el actual ordenamiento, en comparación con el anterior. Es preciso sistematizar, describir y analizar la estructura del sistema penal acusatorio, a efecto de estar en condiciones de evaluar y, en su caso, proponer las mejoras al sistema en cuestión. El contenido esquemático y sustancial del código, la visión y recepción que del mismo tienen los operadores jurídicos y la sociedad en general, son aspectos que cubre el presente documento. The study and understanding of the new Code of Criminal Procedure of Veracruz is unavoidable, by reason of the sharp differences between the legal concepts that contains the actual order, compared with the previous. Needs to be systematized, describe and analyze the structure of the adversarial criminal system, in order to be able to evaluate and, if necessary, propose improvements to the system in question. The schematic and substantial content of the code, viewing and welcome that the same have the legal practitioners and society in general, are aspects covered by herein.

  11. Floods of 2005 in the State of Veracruz Book Presentation

    Science.gov (United States)

    Tejeda, A.; Ochoa, C.

    2007-05-01

    During October of 2005, when hurricane Stan caused destruction to the center and south of the state of Veracruz, a book was elaborated. The book's called Floods of 2005 in the state of Veracruz and contains twenty chapters. The first three chapters conform a panoramic of the book and two historical and archaeological contributions. One second part takes care of the natural phenomena of floods: meteorological, hydrological aspects, and biodiversity. Economic and social aspects are the largest contents of the volume, which concludes with reflections towards the future: the possible consequences of global climatic change, the chemical component that's not considered in the evaluation and prevention of risks by hidrometeorogical phenomena, and the duty of political prevention of disasters. The frame reference for the book is through a discussion of all kind of contributions. Which means that this book presentation is for the geophysicists community of Mexico. Keywords: Floods, state of Veracruz, risks and disasters.

  12. Nesting of Morelet's crocodile, Crocodylus moreletii (Dumeril and Bibron), in Los Tuxtlas, Mexico.

    Science.gov (United States)

    Villegas, A; Mendoza, G D; Arcos-García, J L; Reynoso, V H

    2017-11-01

    We evaluated the nesting by Crocodylus moreletii in Lago de Catemaco, Veracruz, southeastern, Mexico. During the nesting and hatching seasons, we searched for nests along the northern margins of the lake and small associated streams. We investigated egg mortality by weekly monitoring each of the nests found, recording sign of predation (tracks and holes dug into the nest) and the effect of water level fluctuations. We not found differences to nest between inland or flooded zones. However, we found that egg size varied among nests. In nests built inland, predation was the major cause of egg mortality whereas flooding resulted in more deaths of eggs in the flooding zone. Flooding killed 25% of eggs monitored in this study. We suggest that to increase nest success in the Morelet's crocodile it is necessary to promote conservation of nesting areas around the lake, recently occupied by urban or tourist developments.

  13. Nesting of Morelet’s crocodile, Crocodylus moreletii (Dumeril and Bibron, in Los Tuxtlas, Mexico

    Directory of Open Access Journals (Sweden)

    A. Villegas

    2017-03-01

    Full Text Available Abstract We evaluated the nesting by Crocodylus moreletii in Lago de Catemaco, Veracruz, southeastern, Mexico. During the nesting and hatching seasons, we searched for nests along the northern margins of the lake and small associated streams. We investigated egg mortality by weekly monitoring each of the nests found, recording sign of predation (tracks and holes dug into the nest and the effect of water level fluctuations. We not found differences to nest between inland or flooded zones. However, we found that egg size varied among nests. In nests built inland, predation was the major cause of egg mortality whereas flooding resulted in more deaths of eggs in the flooding zone. Flooding killed 25% of eggs monitored in this study. We suggest that to increase nest success in the Morelet’s crocodile it is necessary to promote conservation of nesting areas around the lake, recently occupied by urban or tourist developments.

  14. DIAGNOSIS OF AQUACULTURE IN THE MUNICIPALITY OF ALVARADO VERACRUZ, MEXICO

    Directory of Open Access Journals (Sweden)

    Lenin Rangel-López

    2014-07-01

    Full Text Available This research aims to analyze the current situation of aquaculture farms in the Municipality of Alvarado, Veracruz, Mexico. During this study, 29 interviews were conducted aimed to the units of aquaculture producers; 24 variables were analyzed within the aspects of the socio-economic, technical, marketing and legal framework. The most relevant results within the legal framework: 21% of units has “National Registration of Fisheries and Aquaculture” (RNPyA and 7% has “Federal Taxpayer Register” (RFC; in the socio-economic aspects: 187 jobs are generated; on technical aspects: the average area for cultivation is 410.11 ha, 79% of production is Tilapia (Oreochromis spp.. The aquaculture activity on Alvarado, Veracruz, it is in a learning process, therefore strategies are needed in order to the development of the activity and increasing production; improving cultivation methodologies and training producers on managing their aquaculture units.

  15. [Anthropoentomophagic biodiversity of the Zongolica region, Veracruz, Mexico].

    Science.gov (United States)

    Ramos-Elorduy, Julieta; Landero-Torres, Ivonne; Murguía-González, Joaquín; Pino, José M M

    2008-03-01

    Anthropoentomophagic biodiversity of the Zongolica region, Veracruz, Mexico. During two and a half years (2003-2005) we recorded the insect species used as food at Zongolica, Veracruz State, Mexico. Interviews were made among people (200) of this municipality to know which insects they consumed. The total of registered species was 57 (Orthoptera, Hemiptera, Homoptera, Megaloptera, Coleoptera, Lepidoptera and Hymenoptera). The Orthoptera was the most frequently ingested. Twenty-four of these species were new records for edible insects of Mexico. They are eaten in immature stages or as adults, generally only roasted. Consumption is seasonal. Some species are commercialized in the "tianguis" (little town markets) and/or in the larger Zongolica market. There is a "protoculture" of three species, one cockroach (Periplaneta australasiae Fabricius) and two moths (Latebraria amphipyroides Guenée and Arsenura armida armida Cramer). In Zongolica, anthropoentomophagy is an ancestral habit.

  16. Climatic Action Plan Project for the state of Veracruz (Mexico)

    Science.gov (United States)

    Tejeda, A.; Ochoa, C.

    2007-05-01

    With financing of the British Government and support of the National Institute of Ecology, from April of 2006 to March of 2008 an action plan which intends variability effects and climatic change for the state of Veracruz will be made. This plan will be taken to the state government and will be spread out to manufacturers, industrialists and population. Throughout the Gulf of Mexico, the state of Veracruz is a 745 km coast in length with a width that goes from 156 km in the center to 47 km in the north. The state has large mountains, forests, plains, rivers, cascades, lagoons and coasts. Veracruz is the 10th largest state in Mexico with a 72,420 km2 surface, it is located between 17°00' and 22°28' north latitude and between 93°95' and 98°38' west longitude. Because of the orographic effect, the Sierra Madre Oriental causes the existence of many types of climate, from dry to tropical forest, going through snow on the top of the Pico de Orizaba (5747m of altitude). The wind affects the coasts by not allowing to fish during a hundred days a year (particularly in winter), and on summer tropical waves and occasionally hurricanes affect rivers causing overflow and urban floods in fields. These phenomena do not have a regular affectation; they are subject to climate variability effects. Veracruz is the third state with most population in the country (7.1 million people in 2005), only surpassed by the state of Mexico and Mexico City. Although it occupies 3.7% of the national territory, Veracruz has 6.9% of human population in the country, and is the 6th state of PIB national contribution (240 thousands of millions pesos approximately). Of the possible effects of the climatic change the following can be expected: , , : Most of the coasts of the Gulf of Mexico, low and sandy, less of a meter on the sea level, represent the most vulnerable territory of Veracruz. Towns will be affected, the saline water will infiltrate until the phreatic mantles and the coast electrical

  17. Estimating evapotranspiration in the central mountain region of Veracruz, Mexico

    OpenAIRE

    Ballinas, Mónica; Esperón-Rodríguez, Manuel; Barradas, Víctor L

    2015-01-01

    The global, regional and local hydrological cycle is strongly linked to vegetation distribution. The hydrological cycle is composed by precipitation, infiltration, runoff, transpiration and evaporation. Evaporation is influenced by high temperatures, high winds and low relative humidity. This work is focused on the study of evapotranspiration (ET) as the main variable of water loss in the water balance in the central mountain region of Veracruz, Mexico. ET was estimated using the Penman-Monte...

  18. Characterization of the billow applied to Tuxpan, Veracruz; Caracterizacion del oleaje aplicada a Tuxpan, Veracruz

    Energy Technology Data Exchange (ETDEWEB)

    Rosales Sierra, Victor

    1999-07-01

    In this work, the criteria for the wave temporal and spectral statistical analysis were reviewed. These analysis are applied to the site Tuxpan, Veracruz, in the Mexican Gulf coast. In the temporal statistic analysis, the high (Rayleigh, Tayfun and Carter) and period (Bretchneider, Cavanie and Longuet-Higgins) theoretic probability distributions are compared with field data from Tuxpan. In the other hand, in the frequency domain analysis, the theoretic spectrums (Bretchneider-Mitsuyasu, Jonswap-Hasselmann, Pierson-Moscowitz, Neumann, ITTC, ISSC, TMA and Ochi-Hubble) are compared with the one obtained from Tuxpan measurements, then changes are made to some spectrums in order to better couple to field data. Finally, some recommendations are made to improve the wave data acquisition and analysis methods. From the study results, it's important to mention that the Tayfun high probability distribution and the Cavanie period probability distribution better fit Tuxpan field data. In the spectral analysis, the Bretchneider spectrum, modified by Mitsuyasu, better coupled to the spectrum obtained from Tuxpan field data. In the temporal statistical analysis, correct the mean level using the parabolic approximation, in order to eliminate the tidal and long period wave effects, it is recommended. For the registered individual wave calculus the zero up cross method was used. [Spanish] En este trabajo se revisan los criterios para el analisis estadisticos temporal y espectral del oleaje, mismos que son aplicados para la caracterizacion del oleaje en Tuxpan, Veracruz. En cuanto al analisis estadistico temporal, se comparan las distribuciones teoricas de probabilidad de altura de Rayleigh, Tayfun y Carter; y las de periodo de Bretchneider, Cavanie y Longuet-Higgins contra las resultantes de las mediciones en campo. Por otro lado y concerniente al analisis en el dominio de la frecuencia, se comparan los espectros teoricos de Bretchneider- Mitsuyasu, Jonswap-Hasselmann, Pierson

  19. Persea schiedeana (Lauraceae), nuevo hospedero de Heilipus lauri Boheman (Coleoptera: Curculionidae) en Veracruz, México

    OpenAIRE

    Castañeda-Vildózola, Alvaro; Del Ángel-Coronel, Oscar A; Cruz-Castillo, Juan G; Váldez-Carrasco, Jorge

    2009-01-01

    Se reporta por primera vez la presencia del Molytinae Heilipus lauri Boheman atacando frutos de Persea schiedeana, comúnmente conocidos como "chinene" in Hustusco y Zongolica, Veracruz, México. The presence of the Molytinae Heilipus lauri Boheman is reported for the first time attacking fruits of Persea schiedeana, commonly called "chinene" in Huatusco and Zongolica, state of Veracruz, Mexico.

  20. Tree canopy composition in the tropical mountain rainforest of los Tuxtlas, Mexico

    Directory of Open Access Journals (Sweden)

    Mario Vázquez-Torres

    2008-09-01

    Full Text Available We studied the arboreal composition of the tropical mountain rainforest’s upper canopy in the San Martín Pajapán volcano, Tatahuicapan, Veracruz, México (18°26’ N; 94°17’ W. Two forest stands were studied, one in an exposed position and one protected. The Shannon index of diversity and the Jaccard index of affinity were calculated to calculate affinities between plots and between stands of different environmental exposures. The average Shannon value was 3.391 +0.121 for the exposed zone and 3.511 +0.53 for the protected zone. There is a greater species number and tree density in the exposed stand. This difference might be caused be different orientation to dominant winds. The diversity index value is high is similar between the stands, despite the important difference in species composition. Rev. Biol. Trop. 56 (3: 1571-1579. Epub 2008 September 30.El objetivo de este trabajo fue conocer la composición arbórea del bosque tropical lluvioso en el volcán de San Martín Pajapán. Se comparan dos áreas en diferente exposición: expuesta a los vientos dominates y protegida de los vientos. El valor medio del índice de diversidad de Shannon es de 3.391 +0.121 para la zona expuesta y 3.511 +0.53 para la protegida. El número de especies y la densidad de árboles por hectárea es mayor en la zona expuesta y la composición de especies es muy diferente entre las parcelas.

  1. Zoning and Geotechnical Characterization of soils from the port of Veracruz; Zonificacion y Caracterizacion geotecnica de los Suelos del Puerto de Veracruz

    Energy Technology Data Exchange (ETDEWEB)

    Lenz, O.; Ochoa Sanchez, O. A.

    2012-07-01

    Describes the geological province that hosts the city of Veracruz and the morphological traits that resulted from the activity that preceded the Quaternary on the other hand, presents the geotechnical characteristics of the soil, which constitute the different deposits that make up the ground to throughout the length and breadth of the urban sprawl from Veracruz and urban areas, and then after, make a zoning proposal from the point of view geotechnical. (Author) 25 refs.

  2. Mujeres y mercado de trabajo del turismo alternativo en Veracruz

    Directory of Open Access Journals (Sweden)

    Isis Arlene Díaz-Carrión

    2013-01-01

    Full Text Available Resultado de su compromiso con una sustentabilidad social, el turismo alternativo es considerado una actividad para potenciar cambios en la tradicional división del trabajo. En esta investigación cualitativa se revisa la participación de las mujeres en el turismo alternativo del estado de Veracruz y se visibilizan segregaciones ocupacionales y simultaneidad en la realización de trabajo productivo- reproductivo y de cuidados. El enfoque de género se muestra como una herramienta potencial para observar el trabajo productivo de las mujeres y promover el acceso al espacio público y sus recursos.

  3. [Persea schiedeana (Lauraceae), a new host of Heilipus lauri Boheman (Coleoptera: Curculionidae) in Veracruz, Mexico].

    Science.gov (United States)

    Castañeda-Vildózola, Alvaro; Del Angel-Coronel, Oscar A; Cruz-Castillo, Juan G; Váldez-Carrasco, Jorge

    2009-01-01

    The presence of the Molytinae Heilipus lauri Boheman is reported for the first time attacking fruits of Persea schiedeana, commonly called 'chinene' in Huatusco and Zongolica, state of Veracruz, Mexico.

  4. Circulation in the SAV, Shelf of Veracruz, Mexico

    Science.gov (United States)

    Zavala-Hidalgo, J.; Martinez-Lopez, B.; Fernandez-Eguiarte, A.; de Buen, R.; Rojas, J.

    2007-05-01

    Data from current meter, hydrographic measurements, and numerical modeling are analyzed to determine the circulation patterns in the Sistema Arrecifal Veracruzano (SAV), Veracruz, Mexico, region. Results show that the main forcing in the region is the along-coast wind stress component. Tides contribute with one order of magnitude less energy, during the fall-winter period. Two main regimes are identified: one between the coast and the 20 m isobath, with waters of large turbidity and small influence from rivers, and the other between the 20 m isobath and the external shelf, with clearer waters. Stratified water column with low temperature upwelled waters near the bottom are observed when southeasterly winds are present. Downwelling and southeastward currents are associated with northerly winds linked with northers.

  5. Family, remittances and social media focused on migration in Veracruz

    Directory of Open Access Journals (Sweden)

    Ana Lid del Ángel Pérez

    2009-01-01

    Full Text Available Field research was conducted during 2005 and 2006 in central Veracruz, Mexico. We worked with 38 families of undocumented migrants and five men who have returned to the localities. The objective was to analyze the factors detonating of migration in four locations, as well as the role played by diverse social networks in the phenomenon, and family dynamics as a result of the absence of male or economic provider. The results showed as triggers of migration seeking better opportunities for jobs and quality of life, based on a modification of the work ethic and expectations that can not get in Mexico, and where various types of networks facilitate the departure of migrants, stay in the United States, and job search. There was continuity and strengthening the structure and dynamics of extended domestic groups, and the prevalence of patrilineal hierarchical roles, where women, maintain the traditional domestic role, without economic independence, under the tutelage economic and moral advancement of the kindred male absent. With regard to the use of remittances, the will of man is executed through their relatives, while retaining the traditional roles of a type of marriage at a distance, not based on the co–residence.

  6. Organochlorine pesticide level differences among female inhabitants from Veracruz, Puebla and Tabasco, Mexico.

    Science.gov (United States)

    Waliszewski, Stefan M; Caba, M; Saldarriaga-Noreña, H; Martínez, A J; Meza, E; Valencia Quintana, R; Zepeda, R

    2014-08-01

    Organochlorine pesticides have been used in Mexico in malaria control programs and against ectoparasites. The objective of this study was to compare the levels of organochlorine pesticides: HCB, α-β-γ-HCH, pp'-DDE, op'-DDT and pp'-DDT in adipose tissue of female inhabitants from three Mexican states: Veracruz, Puebla and Tabasco. Data analyses indicated higher β-HCH levels in Puebla inhabitants. When comparing the mean values of the pp'-DDE concentrations among the three states, no statistically significant differences were noted. A trend of increasing concentrations of op'-DDT from Veracruz to Puebla and Tabasco was observed. Significantly higher pp'-DDT concentrations in Veracruz as compared to Puebla and Tabasco were determined. Using factorial analysis of three age categories (>30, 31-50, pesticide concentrations increases with age of participants, indicating time of exposure as a principal factor of organochlorine pesticides accumulation in adipose tissue.

  7. Las redes sociales en la migración emergente de Veracruz a los Estados Unidos.

    OpenAIRE

    Mario Pérez Monterosas

    2003-01-01

    Este artículo examina el proceso migratorio internacional en una región de Veracruz, donde desde mediados de la década de los noventa se ha desarrollado una migración de hombres y mujeres indocumentados que se dirigen a destinos tanto tradicionales como nuevos en los Estados Unidos. Se utilizan entrevistas abiertas y en profundidad en tres municipios del centro de Veracruz para analizar el papel que juegan las redes sociales en la migración de trabajadores rurales. Estos nue...

  8. Historical Roots of the Spatial, Temporal, and Diversity Scales of Agricultural Decision-Making in Sierra de Santa Marta, Los Tuxtlas

    Science.gov (United States)

    Negrete-Yankelevich, Simoneta; Porter-Bolland, Luciana; Blanco-Rosas, José Luis; Barois, Isabelle

    2013-07-01

    Land degradation is a serious problem in tropical mountainous areas. Market prices, technological development, and population growth are often invoked as the prime causes. Using historical agrarian documents, literature sources, and historical population data, we (1) provide quantitative and qualitative evidence that the land degradation present at Sierra de Santa Marta (Los Tuxtlas, Mexico) has involved a historical reduction in the temporal, spatial, and diversity scales, in which individual farmers make management decisions, and has resulted in decreased maize productivity; and (2) analyze how these three scalar changes can be linked to policy, population growth, and agrarian history. We conclude that the historical reduction in the scales of land use decision-making and practices constitutes a present threat to indigenous agricultural heritage. The long-term viability of agriculture requires that initiatives consider incentives for co-responsibility with an initial focus on self-sufficiency.

  9. ABC 27-2 General bat activity measured with an ultrasound detector in a fragmented tropical landscape in Los Tuxtlas, Mexico

    Directory of Open Access Journals (Sweden)

    Estrada, A.

    2004-12-01

    Full Text Available Bat tolerance to neotropical forest fragmentation may be related to ability by bats to use available habitats in the modified environmental matrix. This paper presents data on general bat activity (for three hours starting at dusk measured with an ultrasound detector in a fragmented landscape in the region of Los Tuxtlas, Mexico. Bat activity was measured in continuous forests, forests fragments, forest-pasture edges, forest corridors, linear strips of vegetation, citrus groves, pastures and the vegetation present in local villages. The highest bat activity rates were recorded in the villages, in the forest fragments and in linear strips of vegetation. The lowest activity rates were detected in pasture habitats. Data suggest that native and man-made arboreal vegetation may be important for sustaining bat activity in fragmented landscapes.

  10. Leer y escribir en la “orillada”. Niños y niñas en asentamientos irregulares de Tuxtla Gutiérrez

    Directory of Open Access Journals (Sweden)

    Francesca Paola Casmiro Gallo

    2014-01-01

    Full Text Available En este artículo analizo la experiencia de animación a la lectoescritu- ra realizada con niños y niñas que viven en asentamientos irregulares de Tuxtla Gutiérrez. Precisamente, colaboré con la comunidad escolar Luis Macondo, 2 escuela primaria, pública y vespertina, ubicada en la colonia Las Granjas Km4. Gracias a su apoyo, pude empezar una investigación acerca de los imaginarios de lectura y motivación al hábito lector de tres grupos de actores sociales —ma- dres de familia, docentes y alumnos—, quehacer investigativo cuya función fue encaminarme hacia la estructuración de un círculo de lectoescritura.

  11. High prevalence of Toxoplasma gondii antibodies in dogs in Veracruz, Mexico

    Science.gov (United States)

    Little is known concerning the prevalence of Toxoplasma gondii infection in dogs in Mexico. Here, we investigated antibodies to T. gondii and associated risk factors in 101 dogs from an animal shelter in Veracruz State, Mexico. Canine sera were assayed for T. gondii IgG antibodies by using the modif...

  12. TRADITIONAL USE OF THREE EDIBLE INSECTS IN COFFEE AGROECOSYSTEMS IN THE STATE OF VERACRUZ

    Directory of Open Access Journals (Sweden)

    Esteban Escamilla Prado

    2012-11-01

    Full Text Available Coffee (Coffea arabica L. is one of the most economically, socioculturally and environmentally important crops in Veracruz. Shade-grown coffee plantations provide environmental services and play a key role in biodiversity conservation. In coffee farms in Veracruz insects are an abundant natural resource, and part of the use of this resource is the consumption of some edible insects in certain coffee regions. The objective of this study was to know the traditional use of three species of edible insects in the coffee agroecosystem of Veracruz. During the period 2007-2012, an ethnoentomological study was conducted in coffee regions from central Veracruz. The insect species identified were the ants chicatanas (Atta mexicana Smith and Atta cephalotes Latreille in the municipality of Huatusco, the larva gusano del jonote (Arsenura armida armida Cramer in the municipalities of Zongolica, Tequila and Tezonapa, and the larva gusanillo (Phassus triangularis H.E. in the municipalities of Córdoba, Ixhuatlán del Café, Tepatlaxco, Chocamán and Zongolica. The results showed the traditional knowledge held by coffee growers related to these edible species which are a valuable natural resource in their coffee plantations. Knowledge on agroecological relationships, collection, consumption and marketing was rescued. In conclusion, the insect species studied are used for local consumption and have great economic potential due to their high sell price during the harvest season.

  13. Fluid flow evolution in petroleum reservoirs with a complex diagenetic history: An example from Veracruz, Mexico

    NARCIS (Netherlands)

    Ferket, H.; Swennen, R.; Ortuno-Arzate, S.; Roure, F.

    2006-01-01

    This paper discusses the fluid flow evolution in the Veracruz petroleum province of eastern Mexico based on results of an integrated diagenetic, sedimentological and structural analysis. The area progressively changed from passive foreland towards an active fold-and-thrust belt into a passive belt

  14. Culture and environment in the Sierra de Misantla, Veracruz, Mexico: the case of Oecopetalum mexicanum

    Science.gov (United States)

    Maite Lascurain; Citlalli Lopez-Binnquist; Marla R. Emery

    2016-01-01

    We analyze the cultural and environmental dimensions of foraging the wild edible fruit cachichín (Oecopetalum mexicanum) in the Sierra de Misantla in central Veracruz, Mexico, including gathering practices, social organization, subsistence, commerce, and consumption. Gathering cachichín brings...

  15. Alimentación, salud y pobreza en áreas marginadas urbanas: caso Veracruz-Boca del Río, Veracruz, México

    OpenAIRE

    Del Ángel-Pérez, Ana Lid; Villagómez-Cortés, José Alfredo

    2014-01-01

    Se caracterizó la alimentación en 120 hogares en áreas marginadas en Veracruz-Boca del Río, México, mediante el Indice de Diversidad Dietética y su asociación con variables socioeconómicas. Los hogares se clasificaron en cuatro niveles socioeconómicos, 99% se ubicó en situación de pobreza. De 52% a 71% del ingreso familiar se gasta en alimentos. En la dieta prevalecen alimentos con alto contenido calórico, proteína animal de baja calidad y bajo consumo de frutas y verduras. La diversidad diet...

  16. Air pollution transport to the El Tajin archaeological zone in Veracruz, Mexico

    International Nuclear Information System (INIS)

    Kahl, J.; Bravo, H.; Sosa, R.; Sanchez, P.; Alarcon, A.; Soto, R.

    2009-01-01

    Features of atmospheric transport to El Tajin, an important archaeological site in Veracruz, Mexico, are investigated. The study is motivated by the need for an increased understanding of the meteorological processes contributing to acidic precipitation at Meso american heritage sites. Using a variety of meteorological resources and analysis techniques we find that both large-scale and local meteorological forcing favor transport from easterly and northerly sources. (Author)

  17. [Epidemiologic behavior of malignant digestive tract tumors over a five year period in Veracruz, Mexico].

    Science.gov (United States)

    Roesch-Dietlen, F; Jiménez-García, V A; Remes-Troche, J M; Rubio-Arce, J F; López-Salinas, A; Ruiz-Juárez, I; Grube-Pagola, P; Silva-Cañetas, C F

    2012-01-01

    Tumors of the digestive system are considered to be a public health problem because of their elevated mortality rate. In Mexico, gastric cancer and colon cancer rank fourth and fifth, respectively, following tracheal, bronchial, and lung cancer, and there has been an increase in their frequency in the last few years. However, there are no specific studies that have evaluated their epidemiologic behavior in Veracruz. To determine the frequency of digestive system cancer in five health institutions in the city of Veracruz and to describe its epidemiologic behavior over a five-year period. Annual statistics from the following hospitals were reviewed: the Instituto Mexicano del Seguro Social, the Secretaría de Salud, the Instituto de Seguridad y Servicios Sociales de los Trabajadores del Estado, Petróleos Mexicanos, and the Secretaría de la Defensa Nacional within the time frame of January 2005 to December 2009. Diagnoses based on histopathology were recorded, along with patient age and sex. A total of 1803 cases of digestive tract cancers were detected: 52% were men and 48% were women. A yearly increase in the number of cases was observed with colon cancer being in first place, followed by stomach cancer and rectal cancer. The increase in digestive system cancer cases over the last five years in Veracruz underlines the need to evaluate the implementation of screening programs for the at-risk population and to study the different etiologic factors involved in its manifestation.

  18. Household risk factors associated to infestation of Triatoma dimidiata, the Chagas disease vector in Central Region of Veracruz, Mexico

    Directory of Open Access Journals (Sweden)

    César A Sandoval-Ruiz

    2014-03-01

    Full Text Available Objective. To evaluate risk factors facilitating the colonization of dwellings by Triatoma dimidiata in the central region of the state of Veracruz. Materials and methods. We applied socioeconomic questionnaires and entomologic surveys in three localities (Chavarrillo, Soyacuautla and Arroyo Agrio in central Veracruz involving 115 households. Results. We found that the main risk factors were the predominance of unplastered walls and particularly those made of light weight aggregate concrete blocks and wood. At Chavarrillo, houses usually have unplastered walls, whereas in Soyocuautla walls are commonly manufactured with wood. In Arroyo Agrio, the phenomenon was seasonal, and bugs were commonly found in the dry season, particularly in relatively new houses, less than 20 years old. Conclusions. These results help to improve the surveillance capacity for this vector and the control strategies to reduce the transmission of Chagas disease in the state of Veracruz and other sites where this species is present.

  19. Alimentación, salud y pobreza en áreas marginadas urbanas: caso Veracruz-Boca del Río, Veracruz, México

    OpenAIRE

    Ana Lid Del Ángel-Pérez; José Alfredo Villagómez-Cortés

    2014-01-01

    Se caracterizó la alimentación en 120 hoga - res en áreas marginadas en Veracruz-Boca del Río, México, mediante el Indice de Di - versidad Dietética y su asociación con varia - bles socioeconómicas. Los hogares se clasifi - caron en cuatro niveles socioeconómicos, 99% se ubicó en situación de pobreza. De 52% a 71% del ingreso familiar se gasta en alimentos. En la dieta prevalecen alimentos con alto contenido calórico, proteína animal de baja calidad y bajo consumo de frutas y verduras. La div...

  20. EVIDENCIA DEL IMPACTO HUMANO Y CAMBIO CLIMÁTICO NATURAL EN LA REGIÓN DE LOS TUXTLAS, VER.: UN ENFOQUE MULTIDISCIPLINARIO

    Directory of Open Access Journals (Sweden)

    Ma. del Socorro Lozano-García

    2007-01-01

    Full Text Available El estudio del cambio ambiental utilizando el registro de los indicadores en escalas temporales pasadas, aporta información sobre los diferentes factores que influyen en los ecosistemas. En este trabajo se presentan evidencias de actividad humana y cambio climático en la región tropical de la sierra de Los Tuxtlas, con base en el registro de indicadores de cambio ambiental para los últimos 2000 años. En la secuencia lacustre del Lago Verde, localizado en la porción norte del Golfo de México, se llevó a cabo el análisis de susceptibilidad magnética, carbón orgánico total, contenido de polen, diatomeas y partículas de carbón con el propósito de documentar el impacto humano y su efecto en el ambiente, así como, identificar las condiciones climáticas en la que se desarrollaron. Se identificaron dos etapas de actividad en la cuenca, la primera durante el Clásico en condiciones climáticas secas con una deforestación intensa, actividad agrícola, fuegos, eventos de erosión y niveles lacustres bajos. La segunda etapa a partir de 1960 se caracteriza por deforestación, actividad agrícola y en el lago hay niveles altos y condiciones eutróficas pero se desarrolla bajo escenarios climáticos diferentes.

  1. Sistemas de siembra para soya de invierno en Veracruz, México

    Directory of Open Access Journals (Sweden)

    Oscar H. Tosquy Valle

    2006-01-01

    Full Text Available La finalidad de este trabajo fue determinar en el norte del estado de Veracruz, México, si la tecnología generada sobre sistemas de siembra de soya en temporal, puede adaptarse a las condiciones de riego. El experimento se estableció en Medellín de Bravo, Veracruz, México, mediante el diseño de bloques al azar con cuatro repeticiones en factorial 2 x 3 x 2 y arreglo de surcos en franjas. Se evaluaron dos distancias entre surcos: 60 y 75 cm, tres densidades: 150.000, 250.000 y 350.000 plantas/ha y dos genotipos: la línea DM 301 y la variedad Huasteca 200. Aunque con el surcado a 60 cm se obtuvo una mayor altura y número de entrenudos por planta, el rendimiento fue similar con ambos distanciamientos. Con 150.000 plantas/ha se produjeron más vainas por planta, pero con densidades mayores, las plantas fueron más altas, con más entrenudos y tuvieron un rendimiento promedio superior en 571,7 kg/ha. Huasteca 200 tuvo un rendimiento de 3.268 kg/ha, superior en 21,8% al obtenido por DM 301. Se concluye que existe potencial para producir soya de riego en invierno en el centro de Veracruz. La mayor producción se obtuvo con la variedad Huasteca 200 a 250.000 plantas/ha, en surcos espaciados a 60 ó 75 cm

  2. Methodology to develop maps of susceptibility to mass removal processes, case analysis south slope of Tuxtla Gutiérrez, Chiapas

    Directory of Open Access Journals (Sweden)

    J. A. Paz Tenorio

    2017-03-01

    Full Text Available The city of Tuxtla Gutiérrez, Chiapas, has historically presented processes landslides in the southern part of the valley, specifically in deposits of slope whose genesis is determined from La Mesa karst of Copoya, geological forms subjected to intense fracturing processes dissolution and erosion, giving as a result the breaking into large blocks. These are distributed in the margins of La Mesa being altered and destroyed by mechanical and chemical weathering, which generated smaller particles that rest on siltstones, shale and sandstones. This condition determines that the slopes are unstable by nature. A 1000 x 1000 m grid was constructed, corresponding to the canvass of the Mercator Transverse Universal Coordinate System (UTM of the topographic map scale 1:50 000 (INEGI, 1984; INEGI, 2004; Lugo-Hubp, 1988. In each cell a centroid was generated to apply the interpolation process and draw isolines. For numerical variables such as drainage density and unevenness, defined ranges (number of equal intervals were used by ArcMap software (version 9.3. For the non-quantitative variables such as geology, edaphology and soil use and vegetation, the same AHP method was used, obtaining numerical values for the cartographic representation. In all three cases, the normalized values and a Consistency Index (CI and Consistency Ratio (CR (the latter according to the dimension of the matrix were obtained, below 10%, so that the weights are correct. In order to obtain information on the changes in the use of the ground, images of Google Earth of 2006, 2008 and 2010 were revised. Subsequently, a very high resolution orthophoto was added (pixel of 0.2 m, obtained for cadastral purposes by Town Hall of Tuxtla Gutierrez between the end of 2012 and the beginning of 2013. Finally, five layers of information are defined, one for each variable, and the final result overlaps with the events recorded in the last nine years (2006 to date, which shows that the areas

  3. Orishas, demonios y santos. Un acercamiento al sincretismo de la santer??a, caso Catemaco, Veracruz

    OpenAIRE

    Sald??var Arellano, Juan Manuel

    2009-01-01

    La presente ponencia es resultado de un estudio socio-antropol??gico sobre la religi??n conocida como santer??a, realizado en Catemaco, Veracruz. Dicha religi??n ha sido producto de un sincretismo religioso entre cultos africanos y cat??licos en tiempos de la Colonia en Cuba. Fusi??n no s??lo de deidades, sino tambi??n de productos transnacionales mismos que se han re-utilizado para reforzar pr??cticas como la brujer??a, la curander??a, el espiritismo, entre otras que se practican en la local...

  4. A new glossiphoniid leech from Catemaco Lake, Veracruz, México.

    Science.gov (United States)

    Oceguera-Figueroa, Alejandro

    2008-04-01

    Haementeria acuecueyetzin n. sp. from Catemaco Lake, Veracruz, Mexico, is described based on the examination of 6 specimens. This new hematophagous leech species resembles other members of the genus in the number and position of the eyespots, number of compact salivary glands, and in the presence of 2 pairs of spheroidal mycetomes, but it is distinguished from the other species by having 6 rows of longitudinal smooth white papillae in the dorsal surface and numerous tubercles in dorsal and ventral surfaces. This new species represents the third species of Haementeria in the Northern Hemisphere of the Americas.

  5. Disputas matrimoniales y cambio social en Coyutla, Veracruz (México)

    OpenAIRE

    Chenaut, Victoria

    2003-01-01

    Presentación La multiculturalidad de la Ciudad de México y los Derechos Indígenas Oehmichen, Cristina Conceptos indígenas de la formación territorial y Etno-Político frente al Estado Republicano-Nacional Fischer, Eva Disputas matrimoniales y cambio social en Coyutla, Veracruz (México) Chenaut, Victoria El debate indio sobre la ciudadanía multicultural en México: La revuelta por la dignidad Valladares de la Cruz, Laura Análisis de las actitudes de políticos criollos ...

  6. Techos verdes y el confort térmico en Angostillo, Veracruz, México.

    OpenAIRE

    Beltrán Melgarejo, Abraham

    2013-01-01

    Se diseñó un prototipo de techo verde con enredaderas tropicales y se evaluó el confort térmico brindado por éste en viviendas de una zona rural tropical. Con base en entrevistas a viveristas de la región centro de Veracruz y un recorrido de campo, se preseleccionaron cinco especies Mandevilla sanderi, Solandra maxima, Passiflora edulis, Thunbergia alata y Cissus verticillata. Se evaluó la adaptabilidad de éstas al ambiente sobre techos modelo en condiciones de campo, midiendo sus tasas de cr...

  7. Cartografía urbana mexicana 1880-1910: Guadalajara, México, Puebla y Veracruz

    OpenAIRE

    Irma Beatriz García Rojas

    2010-01-01

    Este ensayo se propone analizar, desde una perspectiva interdisciplinaria, pero con acento histórico cultural, cuatro ejemplos cartográficos de otras tantas ciudades mexicanas de finales del siglo XIX y principios del XX, cuando esa escala geopolítica, geoeconómica y geocultural adquiere gran relevancia en el proyecto de "orden y progreso" enarbolado por el gobierno porfiriano. Las ciudades de México, Guadalajara, Veracruz y Puebla, entre otras, fueron construidas y reconstruidas en ese perio...

  8. Especies útiles de la selva baja caducifolia en las dunas costeras del centro de Veracruz

    OpenAIRE

    Moreno-Casasola, Patricia; Paradowska, Krystina

    2009-01-01

    La selva baja caducifolia es un ecosistema bajo fuerte presión por las actividades humanas. Se distribuye tanto sobre dunas costeras como tierra adentro. El trabajo tiene como objetivo identificar las especies de árboles y palmas nativos útiles que crecen en las selvas bajas caducifolias y acahuales sobre las dunas costeras. En el trabajo se aplicaron cuestionarios y se realizaron entrevistas entre pobladores de San Isidro y Colonia La Mancha, en la costa de Veracruz. Se preguntó acerca del u...

  9. Use of sleeping perches by the lizard Anolis uniformis (Squamata: Polychrotidae in the fragmented tropical rainforest at Los Tuxtlas, Mexico Uso de perchas para dormir por la lagartija Anolis uniformis (Squamata: Polychrotidae en el bosque tropical fragmentado de Los Tuxtlas, México

    Directory of Open Access Journals (Sweden)

    Elisa Cabrera-Guzmán

    2010-12-01

    Full Text Available The use of nocturnal perches by the lizard Anolis uniformis is described. Bimonthly surveys were made throughout a year in small fragments and continuous tropical rainforest areas at Los Tuxtlas, Mexico. Twenty three juvenile individuals and 7 adults were recorded sleeping during the sampling time (18:00 - 23:00 h.. All individuals were found on leaves of plants of 14 species. Perch height ranged from 41.0 to 140.5 cm (mean: 90.1 cm juveniles; 80.6 cm adults and the most frequent sleeping position observed was with the body oriented along the longitudinal axis of the leaf and the head facing the stem of the plant. This apparently vulnerable position can permit the perception of external stimuli such as proximity of predators; although, eco-physiological factors may also influence selection of sleeping perch sites.Se describe el uso de perchas nocturnas por parte de la lagartija Anolis uniformis. Durante un año se ralizaron muestreos bimensuales en fragmentos pequeños y áreas continuas de bosque tropical perennifolio en Los Tuxtlas, México. Se registraron 23 individuos juveniles y 7 adultos durmiendo durante las horas de muestreo (18:00 a 23:00 hrs. Todos los individuos fueron encontrados en hojas de plantas pertenecientes a 14 especies. La altura de las perchas varió entre 41.0 y 140.5 cm (promedio: 90.1 cm juveniles; 80.6 cm adultos y la posición más frecuente de las lagartijas al dormir fue con el cuerpo extendido a lo largo del eje longitudinal de la hoja y la cabeza dirigida hacia el tallo de la planta. Esta posición, aparentemente vulnerable, puede permitir la percepción de estímulos externos como la aproximación de depredadores; sin embargo, factores eco-fisiológicos pueden también influir en la selección de sitios para dormir.

  10. PREVALENCE OF BOVINE CRYPTOSPORIDIOSIS IN THREE ECOLOGICAL REGIONS FROM THE CENTRAL REGION OF VERACRUZ, MEXICO

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    Oscar O. Castelan-Hernández

    2011-11-01

    Full Text Available Prevalence of Cryptosporidium spp. in cattle from three ecological regions in the central area of the state of Veracruz, Mexico, was determined. A transversal study was conducted in 72 calves 3 to 12 months old from six production units from the municipalities of Zentla, Tlacotalpan and Manlio F. Altamirano. Fecal samples were collected from the calves and analyzed using the Kinyoun stain technique. Overall prevalence of cryptosporidiosis was 73.6 %, and by municipality it was 66.7 % in Zentla, 75 % in Tlacotalpan, and 79.2 % in Manlio F. Altamirano. Prevalence by age was 72.4 % in calves 3 months old and 74.4 % in calves 6 to 12 months old. Prevalence was higher in females (78.7 % than in males (45.5 %. Prevalence by breed was 78.8 % in Brown Swiss/Zebu, 83.3 % in Brown Swiss, 50 % in Holstein/Zebu, and 50 % in Brown Swiss/Holstein, with no difference among crosses (P > 0.05. There was no association among infection by Cryptosporidium spp. and sex, breed, age and ecological region. In conclusion, Cryptosporidium spp. is present in the dual purpose cattle production systems in the three municipalities studied located in the central region of Veracruz, Mexico.

  11. BOVINE NEOSPOROSIS IN CATTLE FARMS FROM THE NORTHERN REGION OF THE STATE OF VERACRUZ, MEXICO

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    Tomás Montiel-Peña

    2011-11-01

    Full Text Available The aim of the study was to determine the presence of antibodies against Neospora caninum and its DNA in blood samples from bovine females from the northern region of the state of Veracruz, Mexico. A cross-sectional epidemiological study was carried out in 13 municipalities, with a sample size of 821 animals. Blood and serum samples were analyzed through ELISA and PCR, respectively. Overall prevalence was 20.8 %; the highest specific prevalences were obtained in breeding cows (27.4 %, crossbred cows (20.9 %, second-calving cows (23.2 %, three year-old cows (20.6 % and cows with abortion history (20 %. The risk factors associated with seropositivity were dairy cattle (OR = 1.9; IC95 %: 1.1-3.4 and dog presence in the farms (OR = 5.3; IC95 %: 1.3-22.3. The presence of N. caninum DNA was demonstrated in 4 out of 12 blood samples tested, which evidenced the existence of active infection. In conclusion, there were risk factors associated with bovine neosporosis, which proved the existence of active infection by N. caninum in cows from the state of Veracruz, Mexico.

  12. INTERNATIONAL MIGRATION AND CHANGE IN LAND USE IN BELLA ESPERANZA, VERACRUZ

    Directory of Open Access Journals (Sweden)

    Martha Elena Nava-Tablada

    2012-11-01

    Full Text Available An increase in international migration from the State of Veracruz, Mexico, in the decade of the 1990s, mostly occurred as a result of the agricultural crisis in the rural sector. The state coffee producing sector proved to be no exception to the impact of the recurring crises, caused by the fall in the price of coffee grain in the international market. Many coffee growers migrated to the USA to stave off their own economic collapse. This investigation aimed to analyze the relationship between the process of international migration and change in land use in the communal landholding of Bella Esperanza, Veracruz. For this purpose, historic documentation, interviews with 21 coffee producing families -some of which included migrants-, interviews with key informants and geographical information systems were all used. The main change in land use entailed the substitution of shaded coffee plantations for sugarcane monoculture, implying deforestation. Urban expansion was shown to be incipient, in spite of the significant amount of money transfers directed towards housing construction and the proximity of this “ejido” or communal landholding to the cities of Xalapa and Coatepec. These changes are mainly associated with the crisis involving this commodity, but they have been exacerbated by emigration of family members, who were once in charge of coffee production.

  13. Organochlorine pesticide levels in umbilical cord blood of newborn in Veracruz, Mexico.

    Science.gov (United States)

    Herrero-Mercado, Margarita; Waliszewski, S M; Caba, M; Martínez-Valenzuela, C; Hernández-Chalate, F

    2010-10-01

    Organochlorine pesticides accumulate in lipid rich compartments of organisms. During pregnancy, the compounds pass through the placental barrier appear in cord blood. The aim of this study was to monitor the levels of organochlorine pesticides in 70 umbilical cord blood samples taken during deliveries in Veracruz in 2009. For organochlorine pesticides, only the presence β-HCH (4%, 3.9 μg/L median concentration on wet weight), pp'DDE (100%, 0.7 μg/L) and pp'DDT (4%, 1.4 μg/L) were detected. The total pool of samples divided according to sex of new born babies, showed no statistical differences among median concentrations. The number of deliveries considered as a determinant contamination factor affirmed there were no statistical differences among median concentrations; however pp'DDE levels increased from the one to two childbirth groups. Age of pregnant women as a discriminate factor manifests in a significant increase in contamination levels among first, second and third tertile. In general, umbilical cord blood samples in Veracruz contained organochlorine pesticides, especially pp'DDE, confirming the presence of these compounds in the environment and their transfer from the mother to the developing fetus.

  14. SEROEPIDEMIOLOGY OF GOAT PARATUBERCULOSIS IN FIVE MUNICIPALITIES OF CENTRAL VERACRUZ, MEXICO

    Directory of Open Access Journals (Sweden)

    David Itzcoatl Martínez Herrera

    2012-11-01

    Full Text Available Seroprevalence of goat paratuberculosis and risk factors were determined in flocks from five municipalities in the center of the state of Veracruz, Mexico, by a cross-sectional study using a stratified multistage approach. Sample size was calculated with the program Win Episcope Version 2.0 using the mode "estimate percentages" for 50 % seroprevalence, 5 % error and 95 % confidence, resulting in 182 animals and six animals per flock. According to the tables by Cannon and Roe, a sample size of 26 flocks was obtained, of which six flocks were sampled in the municipality of Tlacolulan and five flocks in each of the remaining four municipalities (Chiconquiaco, Yecuatla, Coacoatzintla and Coatepec. Identification of antibodies against Mycobacterium avium ssp. paratuberculosis was made by indirect ELISA. Seroprevalence was determined with the program VassarStat® for calculating ratios, and the risk factors by odds ratio. Overall seroprevalence was 0.6 % (95 % CI: 0.03 - 3.5. Reactors were only observed in Coatepec. Seroprevalence by municipality was 20 % (95 % CI: 1.0 - 70.12 and by flock 3.85 % (95 % CI: 0.2 - 21.59. There were no risk or protective factors detected. In conclusion, goat paratuberculosis is scarcely distributed in flocks from central Veracruz.

  15. [Prevalence of irritable bowel syndrome in Veracruz City, Mexico: a community-based survey].

    Science.gov (United States)

    Valerio-Ureña, J; Vásquez-Fernández, F; Jiménez-Pineda, A; Cortázar-Benítez, L F; Azamar-Jácome, A A; Duarte-Velázquez, M E; Torres-Medina, V

    2010-01-01

    Irritable bowel syndrome (IBS) is recognized as the most frequent functional digestive disorder around the world. In Latin America and Mexico there are few studies in order to demonstrate its real prevalence in general population. To determine the prevalence of IBS in general population from Veracruz City Mexico, using the Rome II criteria. Using basic information given by bureau for planning urban services from Veracruz country, a 10% random population sample was obtained. Subjects between 16-80 years old were interviewed using a questionnaire based on Rome II criteria and a visual analogous scale in order to estimate the negative effect of IBS symptoms on daily activities. We interviewed 459 subjects with a median age of 31.2 +/- 13.6 years old detecting 78 subjects (16.9%) with IBS symptoms: 25 males and 53 females (gender prevalence of 11.3% and 22.1%, respectively). 28.2% of them had IBS with diarrhea, 50% had IBS with constipation and 21.8% alternating bowel movements, diarrhea and constipation. Negative effect of IBS symptoms on daily activities was significant. The prevalence of IBS in open population was 16.9% according to Rome II criteria, being higher in those older than 35 years old. Constipation was the predominant pattern. Further studies should evaluate associated factors of these findings.

  16. [Factors associated to pulmonary tuberculosis in patients with diabetes mellitus from Veracruz, México].

    Science.gov (United States)

    Pérez-Navarro, Lucía Montserrat; Fuentes-Domínguez, Francisco; Morales-Romero, Jaime; Zenteno-Cuevas, Roberto

    2011-01-01

    In Mexico, 20% of cases of tuberculosis (TB) are associated with diabetes mellitus (DM). However, the behavior of the factors related to this comorbidity is unknown, so the aim of this study was to estimate the risk factors and outcome for TB-DM in a population from the state of Veracruz, Mexico. We developed a double-design study: cases and controls for the estimation of risk factors, and a retrospective cohort for the outcome factors. The populations surveyed were 67 patients with the comorbidity TB-DB and 109 with TB. The risk factors for tuberculosis in the diabetic population studied were: age ≥ 35 with an OR of 2.5 (95% CI: 1.4-4.3) and IMC ≥ 25 with an OR of 8.5 (95% CI: 3.1-23.3). According to the outcome variables, the patients with TB-DM showed an increased risk of 2.8 (95% CI: 2.2-3.4) for the development of drug resistance against tuberculosis. In conclusion, age and overweight are important risk factors, and drug resistance is an important outcome factor for the binomial TB-DM in the population from Veracruz. This information will have important effects on the development of surveillance programs against TB, with emphasis on the characteristics of the diabetic population.

  17. Revolución y liberalismo en la provincia de Veracruz, 1812-1821

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    Ortiz Escamilla, Juan

    2002-08-01

    Full Text Available This article studies the insurrection movement in the province of Veracruz, with especial emphasis on the diversity of actors in a region which was both ethnically heterogeneous and very uneven from a geographical point of view. The different phases of the war, and their relation with the creation of constitutional municipalities provided for in the Cadiz Constitution, as well as the breaking down of the political hierarchy of the different territories, are described.

    Se estudia aquí el desarrollo de la insurgencia en la provincia de Veracruz, poniendo especialmente el acento en la diversidad de los actores de una región geográficamente muy variada y étnicamente heterogénea. Se describen las diferentes fases de la guerra y su relación con la creación de ayuntamientos constitucionales previstos por la Constitución de Cádiz, así como la desintegración de la jerarquía política de los territorios que ésta provoca.

  18. Floristic diversity and cultural importance in agroforestry systems on small-scale farmer's livelihoods in central Veracruz, México

    NARCIS (Netherlands)

    Pietersen, Sjoerd; López-Acosta, Juan Carlos; Gomez-Díaz, Jorge Antonio; Lascurain-Rangel, Maite

    2018-01-01

    México is a cultural and biological megadiverse country with an increased anthropogenic pressure on its tropical landscapes. The study area was the ejido "Los ídolos", Misantla, Central Veracruz, Mexico. The main objective of this research was to identify how the woody plant diversity of

  19. A Seasonal Study Reveals the Occurrence of Exotic Rotifers, the River Antigua, Veracruz, Close to the Gulf of Mexico

    NARCIS (Netherlands)

    Nandini, S.; Sarma, S. S. S.; Gulati, R. D.

    Zooplankton studies in Mexican rivers are few despite the fact that Mexico has >200 rivers. We present data on the seasonal diversity of rotifers during 2013–2014 from the river La Antigua, near Veracruz. We collected samples from 15 stations along a horizontal gradient of ~5 km, from the upper

  20. Alimentación, salud y pobreza en áreas marginadas urbanas: caso Veracruz-Boca del Río, Veracruz, México

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    Ana Lid Del Ángel-Pérez

    2014-01-01

    Full Text Available Se caracterizó la alimentación en 120 hoga - res en áreas marginadas en Veracruz-Boca del Río, México, mediante el Indice de Di - versidad Dietética y su asociación con varia - bles socioeconómicas. Los hogares se clasifi - caron en cuatro niveles socioeconómicos, 99% se ubicó en situación de pobreza. De 52% a 71% del ingreso familiar se gasta en alimentos. En la dieta prevalecen alimentos con alto contenido calórico, proteína animal de baja calidad y bajo consumo de frutas y verduras. La diversidad dietética en todos los niveles socioeconómicos no superó el 50% de los alimentos básicos requeridos para una buena nutrición. El 56% de los hogares tiene a alguien que padece algún tipo de enferme - dad crónica no transmisible, así como algún miembro de la parentela extensa (80% con recomendaciones médicas de cambiar su ali - mentación y hacer ejercicio físico.

  1. La Prevención de riesgos ambientales en el estado de Veracruz, México

    OpenAIRE

    Morosini, Francisco

    2006-01-01

    A Veracruz no es tenen instruments normatius respecte al risc ambiental, normatius pel que fa al risc ambiental, que si bé en l'actual Llei General de l'Equilibri Ecològic i la Protecció a l'Ambient, resulten matèria federal quan es tracti d'activitats alt risc, no està de més tenir procediments que puguin ajudar en la prevenció d'aquest tipus de problemes ambientals, a més de què considerem que el propi estat podria, en la Llei respectiva i el seu reglament, establir normes a certes activita...

  2. [Overweight and obesity in indigenous nahuas from Ixtaczoquitlán, Veracruz, Mexico].

    Science.gov (United States)

    Herrera-Huerta, Emma V; García-Montalvo, Eliud A; Méndez-Bolaina, Enrique; López-López, José G; Valenzuela, Olga L

    2012-01-01

    The study was aimed at determining the prevalence of overweight and obesity in indigenous nahuas from Ixtaczoquitlán, Veracruz, Mexico. For this purpose, a cross-cut study was conducted between 2010 and 2011, in which the body mass index (BMI) was calculated. To define overweight and obesity, the categories of the World Health Organization (WHO) and the Mexican Official Standard (NOM, Spanish acronym) were used. 227 nahuas (77,5% women) were included. According to WHO’s guidelines, the rate for overweight among nahuas was 41%, and 36.5% for obesity; according to NOM, it was 11.4 and 69.2% respectively. In conclusion, the prevalence of overweight and obesity among indigenous nahuas is high. Studies should be conducted to determine the prevalence and risk factors in order to develop prevention strategies based on this information to improve the health quality of these populations.

  3. El huracán Karl: concepciones sobre su origen en una comunidad de Veracruz

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    Arturo Marinero Heredia

    2015-01-01

    Full Text Available Se analizan las concepciones e ideas de pobladores adultos sobre las afectaciones sufridas por el huracán Karl en 2010, en el municipio de La Antigua, Veracruz. Los datos se obtuvieron de entrevistas a informantes claves y grupos focales, además de la revisión de notas periodísticas. Se observa que las concepciones e ideas sobre el origen del desastre las adjudican a las fuerzas naturales, espirituales o religiosas sin reconocer la responsabilidad de las autoridades encargadas de elaborar políticas públicas en la materia y en la falta de previsión social y personal frente a sus devastadores efectos. Esta concepción dificulta la prevención, mantiene a la comunidad en situación de vulnerabilidad e impide o imposibilita la integración, la cohesión social y la acción colectiva.

  4. Coral assemblages are structured along a turbidity gradient on the Southwestern Gulf of Mexico, Veracruz

    Science.gov (United States)

    Jordán-Garza, A. G.; González-Gándara, C.; Salas-Pérez, J. J.; Morales-Barragan, A. M.

    2017-04-01

    Corals on the reef corridor of the southwestern Gulf of Mexico have evolved on a terrigenous shallow continental shelf under the influence of several natural river systems. As a result, water turbidity on these reefs can be high, with visibility as low as turbidity and chlorophyll-a, the coral species composition and environmental variables were analyzed for the three main reef systems of the reef corridor of the southwestern Gulf of Mexico. Completeness of the data set was assessed using species accumulation curves and non-parametric estimators of species richness. Differences in coral assemblages' composition between the reef systems were investigated using univariate (ANOVA) and multivariate (nMDS, ANOSIM, SIMPER) analyses and the relationship between the assemblages and environmental data was assessed using a forward selection process in canonical correspondence analysis (CCA) to eliminate non-significant environmental variables. The northern and central Veracruz reef systems share a similar number of coral species (p=0.78 mult. comp.) and both showed higher species richness than the southern system (pturbidity and productivity were significant on the final CCA configuration, which showed a gradient of increasing turbidity from north to south. Reef geomorphology and the effect of turbidity help explain differences in coral assemblages' composition. More studies are necessary to establish if turbidity could function as a refuge for future environmental stress. Each Veracruz reef system is at the same time unique and shares a pool of coral species. To protect these ecosystems it is necessary to effectively manage water quality and consider coral diversity on the reef corridor of the southwestern Gulf of Mexico.

  5. Monitoring of organochlorine pesticide residue levels in adipose tissue of Veracruz, Mexico inhabitants.

    Science.gov (United States)

    Waliszewski, Stefan M; Caba, M; Herrero-Mercado, M; Saldariaga-Noreña, H; Meza, E; Zepeda, R; Martínez-Valenzuela, C; Infanzon, R; Hernández-Chalate, F

    2011-11-01

    The objective of the present study was to monitor the levels of organochlorine pesticides HCB, α-β-γ-HCH, pp'DDE, op'DDT and pp'DDT in 150 adipose tissue samples of Veracruz, Mexico inhabitants. In analyzed samples, the following pesticides were detected: p,p'-DDE in 100% of the samples at mean 1.643 mg/kg; p,p'-DDT in 99.3.% of the samples at mean 0.227 mg/kg; β-HCH in 97.3% of the samples at mean 0.063 mg/kg; and op'DDT in 93.3% of the samples at mean 0.022 mg/kg. Comparing mean, median and geometric mean concentrations of organochlorine pesticides shows a decrease in values from mean to median and to geometric mean which points out a prevalence of lower concentrations among the total samples and the existence of occasional cases of extreme exposure expressed in range values. The pooled samples divided according to sex, showed only significant differences of pp'DDE median concentrations between sexes. The other organochlorine pesticides indicated no statistical differences between sexes, including the pp'DDE/pp'DDT ratio. The samples grouped according to age, showed that the third tertile was more contaminated for both sexes, indicating age as a positively associated factor with organochlorine pesticide levels in adipose tissue of Veracruz inhabitants. Comparing organochlorine pesticide levels between 2008 and 2010 years, a decreased tendency for β-HCH, pp'DDE, Σ-DDT and pp'DDE/pp'DDT ratio levels was observed.

  6. Organochlorine pesticide residue levels in blood serum of inhabitants from Veracruz, Mexico.

    Science.gov (United States)

    Waliszewski, Stefan M; Caba, M; Herrero-Mercado, M; Saldariaga-Noreña, H; Meza, E; Zepeda, R; Martínez-Valenzuela, C; Gómez Arroyo, S; Villalobos Pietrini, R

    2012-09-01

    The objective of the present study was to monitor the levels of organochlorine pesticides HCB; α-, β-, γ-HCH; pp'DDE; op'DDT; and pp'DDT in blood serum of Veracruz, Mexico inhabitants. Organochlorine pesticides were analyzed in 150 blood serum samples that constituted that which remained after clinical analyses, using gas chromatography-electron-capture detection (GC-ECD). The results were expressed as milligrams per kilogram on fat basis and micrograms per liter on wet weight. Only the following pesticides were detected: p,p'-DDE was the major organochlorine component, detected in 100% of samples at mean 15.8 mg/kg and 8.4 μg/L; p,p'-DDT was presented in 41.3.% of monitored samples at mean 3.1 mg/kg and 1.4 μg/L; β-HCH was found in 48.6% of the samples at mean 4.9 mg/kg and 2.7 μg/L; op'DDT was determined to be in only 3.3% of monitored samples at mean 2.7 mg/kg and 1.4 μg/L. The pooled samples divided according to sex showed significant differences of β-HCH and pp'DDE concentrations in females. The samples grouped according to age presented the third tertile as more contaminated in both sexes, indicating age as a positively associated factor with serum organochlorine pesticide levels in Veracruz inhabitants.

  7. Effects of heavy metals on the oyster (Crassostrea virginica at Mandinga Lagoon, Veracruz, Mexico

    Directory of Open Access Journals (Sweden)

    X Guzmán-García

    2009-12-01

    Full Text Available The Mandinga Lagoon in the Mexican State of Veracruz is an important ecological zone that produces 32% of the oyster output in the state of Veracruz, the main oyster producer in Mexico. Samples of water, sediment, and oysters were collected in 2003 and 2004 to study heavy metal pollution. Metal concentrations were determined in water, soil, and oyster tissues from fresh and detoxified Crassostrea virginica, and histology samples were analyzed. Metal (Cr, Cd, and Pb concentrations in water were within the Mexican legal limits. The recorded values in sediments corresponded to those not producing biological effects (ERL. In the tissues, the highest concentrations corresponded to Pb, above 5.84 μgg-1 dry weight (d.w.; Cd was of 2.23 μgg-1 d.w., and Cr above 6 μgg-1 d.w. The metal levels detected in oysters exceeded the maximum permissible limits (MPL for Cd and Pb, and oysters were unable to eliminate the concentrations of the bioaccumulated metals during the detoxification stage. The histopathological analysis revealed lesions in the digestive gland, edema, atrophy of epithelia in the digestive tubules, the presence of brown vesicles, hemocytic reaction, and necrosis. During detoxification, a higher number of epithelia were observed in the tubules, as well as an increase in brown vesicles and hemocytic reaction. Forty seven percent of oysters presented histopathological lesions related to metal concentrations. It is important to monitor metal concentrations, to detect the source of pollution, andto evaluate the effects on organisms to establish culture areas and adequate criteria for the exploitation of such an important fishery resource. Rev. Biol. Trop. 57 (4: 955-962. Epub 2009 December 01.

  8. Seasonal morphological variability in an in situ Cyanobacteria monoculture: example from a persistent Cylindrospermopsis bloom in Lake Catemaco, Veracruz, Mexico

    OpenAIRE

    Owen Lind; Laura Dávalos-Lind; Carlos López; Martin López; Juli Dyble Bressie

    2016-01-01

    The phrase cyanobacteria bloom implies a transient condition in which one to few species dominates communities. In this paper we describe a condition in which the bloom is of multi-year duration consisting of different morphologies of a single cyanobacteria species. Lake Catemaco, Veracruz, México maintained a year-round massive (108 trichomes L-1) population of potentially toxin-producing cyanobacteria, Cylindrospermopsis spp. The trichomes are present as straight and coiled morphotypes.  Th...

  9. El manatí (Trichechus manatus manatus Linnaeus,1758) (Sirenia) una especie sombrilla, para el Sistema Lagunar de Alvarado, Veracruz

    OpenAIRE

    Daniel Rentería, Iliana del Carmen; Serrano Solís, Arturo; Sánchez Rojas, Gerardo

    2010-01-01

    The most emblematic mammal in the Alvarado Lagoon System (ALS) is the West Indian manatee (Trichechus manatus manatus). In July 1975 was considered as endangered species by the Convention on International Trade in Endangered Species of Fauna and Flora (CITES), since 1982 as a vulnerable species by the International Union for Conservation of Nature (IUCN) and is considered an endangered species under Mexican laws. The manatee is a poorly studied animal in the state of Veracruz because in natur...

  10. Altitude effects on technology and productivity of small bovine farms (milk meat) in Veracruz (Gulf of Mexico).

    Science.gov (United States)

    Ruíz-Guevara, C; De León-González, F; Soriano-Robles, R; Pérez-Carrera, A L; García-Hernández, L A

    2018-03-01

    The dual-purpose bovine system represents 98.4% of the bovine livestock of Veracruz, the main cattle-producing state of Mexico. This system supplies calves to meat companies, a sector in which Veracruz has been the national leader in the last decade. The objective of the present study was to analyze the effect of the altitudinal zonation of farms on livestock technology and productivity in a microbasin of the Gulf of Mexico where small farms predominate. Structured interviews were applied to producers located in three altitudinal zones (at average altitudes of 50, 140, and 450 m, respectively, for lower, middle, and upper zones). Sample size was 135 farms having similar land surface (within a range of 15-22 ha). The results indicated multiple differences among farms located in the three zones. Farms in the middle and lower zones presented higher productive indicators than those in the upper zone. Differences in herd structure and management resulted in important differences in productivity, income, and profits in milk and calf production. We concluded from this study that altitudinal zonation in Veracruz had a clear effect on the differentiation of small farms, which are representative of dual-purpose cattle. The upper zone performs cattle activity under conditions with greater disadvantages in the analyzed region.

  11. Evaluación de líneas de frijol negro, en Veracruz y Chiapas, México

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    Ernesto Lopez

    2001-01-01

    Full Text Available Evaluación de líneas de frijol negro, en Veracruz y Chiapas, México. El presente estudio se llevó a cabo durante los ciclos agrícolas de 1999-2000 y 2000-2001; se evaluó la adaptación y rendimiento de 15 líneas avanzadas de frijol negro, así como un testigo local. Dichos genotipos forman parte al Ensayo Centroamericano de Adaptación y Rendimiento (ECAR. La evaluación se realizó en 11 localidades, cinco en el estado de Chiapas y seis en Veracruz, los experimentos se establecieron bajo condiciones de riego, temporal y humedad residual. Las líneas ICTA-Ju 97-1, ICTA-Ju II- 307, DOR-678 y Cut-45, resultaron sobresalientes por su rendimiento, amplia adaptación y estabilidad. En el ciclo agrícola de otoño-invierno 1999-2000, se evaluó la respuesta de las líneas a las siguientes enfermedades: mosaico dorado (BGMV, mancha angular (Phaseoisariopsis griseola, roya (Uromyces appendiculatus y la antracnosis (Colletotrichum lindemuthianum. Las líneas que resultaron tolerantes fueron ICTA Ju 97-1 y Cut-45. Ambas serán validadas en campos de agricultores para su posible liberación como nuevas variedades para algunas regiones productoras de Veracruz y Chiapas, México

  12. THE EFFECTS OF INTERNATIONAL EMIGRATION ON THE ACAZÓNICA AND HATO DE LA HIGUERA AGROECOSYSTEMS IN VERACRUZ, MEXICO

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    Martha Elena Nava-Tablada

    2010-07-01

    Full Text Available Mexico has a tradition of migration to the United States. Nevertheless, Veracruz had not experienced a significant exodus of its population up until the nineteen nineties, when emigration from Veracruz began to increase rapidly, especially in the rural sector, thus affecting the region’s agroecosystems. Correspondingly, the main objective of this investigation was to analyze how international emigration has affected the agroecosystems of two rural communities in the state of Veracruz. Special attention was paid to factors such as family income, decision making, labor organization, agricultural diversity, technological management and the purpose of production. Information was gathered by direct observation and from interviews with key informants. A survey was conducted in 60 homes and six case studies were employed. Although there are differences between communities, regarding the type of migration (legal or illegal, generally, the following patterns were identified: 1 Agricultural activity is primarily subsidized by remittances sent by emigrants; 2 The departure of the head of the family leads to a change concerning who makes  the decisions;  woman normally occupy subordinate roles; 3 Migration results in an increase in the number of hired farm workers and a greater work load for those who remain in the community; 4 The departure of the work force tends to diminish agricultural diversity; 5 Remittances have a positive impact on technological management by the family production unit; 6 Illegal emigration favors subsistence farming, whereas legal emigration favors commercial production.

  13. Morphology and morphometric relationships of the sagitta of Diapterus auratus (Perciformes: Gerreidae from Veracruz, Mexico

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    Verónica Rivera Félix

    2013-03-01

    Full Text Available Sagittae otoliths are the most studied because of their morphological variability and size; the sagittae may also have valuable taxonomic use and for D. auratus has not yet been described. In the present study we present a morphological description of the sagitta otolith and an analysis of its correlation with various morphometric parameters. The biological material was captured with a beach seine in the coasts of Alvarado and Port of Veracruz, from November 2009 to June 2010. Sagittae were extracted, cleaned, photographed (SEM and optical, and measured. The analysis included the correlations between sagitta’s length and width, versus the fish standard length, height and weight, for a total of 449 fishes. The comparison between left and right sagitta showed no significant difference in both otolith length and width (t-tests, pLos otolitos sagitta son los más estudiados debido a su variabilidad morfológica y a su tamaño, sin embargo, los otolitos de D. auratus no han sido estudiados hasta el momento. En el presente estudio, se muestra una descripción completa de la morfología y un análisis morfométrico de diversas medidas. El análisis incluye las relaciones entre el ancho y largo de la sagitta contra la longitud cefálica, longitud estándar, altura y peso de 449 peces. El material biológico fue capturado con un chinchorro playero en las costas de Alvarado y el Puerto de Veracruz de noviembre 2009 a junio 2010. Las sagittae fueron extraídas, limpiadas, fotografiadas (SEM y ópticas y medidas. La comparación entre el otolito derecho e izquierdo no mostró diferencias significativas entre el ancho y largo (prueba de t, p<0.05 para cada sexo. El otolito derecho fue utilizado para las relaciones de las distintas medidas del otolito del pez y del otolito de hembras y machos; la prueba de Fisher (d.f. 161 and 143, p<0.001 no mostró diferencias significativas de las pendientes e intersecciones entre ellos. La relación longitud del otolito

  14. Genetic structure of populations of Drosophila melanogaster natives from Laguna Verde, Veracruz; Estructura genetica de poblaciones de Drosophila melanogaster originarias de Laguna Verde, Veracruz

    Energy Technology Data Exchange (ETDEWEB)

    Salceda, V M [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico)

    2005-07-01

    The genetic variability hidden present in natural populations of Drosophila melanogaster, it has been broadly analyzed, and it is a tool that allows to detect differences among the different populations of this species, so much of natural nature as experimental. In this occasion we use it to see if differences exist in two neighboring populations inside the Laguna Verde nuclear power plant, Veracruz, and this way to suggest, of having differences in the mount of the relative frequencies of lethal genes, semi lethals and normal, be due to the radioactive emanations product of the reactors operation of the plant. Its were took samples of flies in both towns during three successive seasons and they were transported to the laboratory of the ININ where they were carried out the tests to determine the frequency of the different types of genes. This was made by means of the denominated technique C y L / Pm that allows by means of a cross series with a stump marker to obtain, in the third generation, in isolated form the different types of genes and this way to calculate their relative frequencies. The study understands the analysis of 299 chromosomes extracted from the populations, of those that 95 correspond at the control population and 204 to the experimental one. As a result of the analysis we find that 30.52 percent of the genes of the population witness contains detrimental genes (sum of the lethal plus the semi lethal genes) as long as in the experimental population this value corresponds to 23.03 percent. In accordance with this information was not significant difference among the studied populations. A similar analysis, but now comparing the seasons, (summer against winter), it showed significant difference to 5% with regard to the lethal genes frequency only in the population witness. These results indicate the absence of damage, however it is necessary to consider that this can be due to that indeed there is not him or that the investigation protocol is not

  15. Cultivo de Poecilia reticulata (Pisces:Poecilidae en cuerpos de agua tropicales,Veracruz,México

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    Patricia Devezé Murillo

    2004-12-01

    Full Text Available Los peces ornamentales cultivados se han popularizado como mascotas,generando una demanda local que no se ha podido cubrir con la producción de México y por lo tanto deben importarse.Poecilia reticulata "guppy ",es un pez muy popular en el ámbito acuarístico,hoy en día se ha logrado desarrollar una gran cantidad de variedades según su coloración,tipo y forma de cola.Son peces vivíparos que toleran un ámbito extremo de temperatura,siendo la más adecuada entre 25ºC y 28ºC.El tiempo que tardan las hembras en expulsar a las crías una vez que quedan preñadas,oscila entre los 25 y 30 días dependiendo de la temperatura.En esta investigación,el ciclo reproductivo completo se desarrolló en jaulas flotantes,en una laguna tropical situada en la Llanura Costera del Golfo Sur, Veracruz, México.Se diseñó la infraestructura necesaria para producir guppys (P.reticulata incluyendo el manejo de reproductores,crianza,engorda,alimentación y comercialización,evaluando su factibilidad técnica y financiera.Se realizó un estudio de mercado,a través de una encuesta aplicada a los propietarios de los 22 acuarios existentes en la Ciudad de Veracruz,México.Se analizaron las frecuencias de oferta y demanda de cada especie con respecto a la temporada del año,lugar de origen y resistencia al manejo.Las características hidrobiológicas presentaron valores medios de temperatura (31.4ºC,oxígeno disuelto (4.5 mgl-1y pH (6.8.Con los datos obtenidos en campo se realizó un modelo para producción de P.reticulata ,obteniendo una relación beneficio/costo=1.16,correspondiente al ingreso mínimo potencial con una ganancia bruta de US$257.67, proporcionando empleo a dos personas El aprovechamiento de cuerpos de agua en regiones tropicales a través de la producción de peces de ornato representa una alternativa para disminuir la presión sobre las poblaciones silvestres y las tierras de cultivo,proporcionar fuentes de empleo e incrementar los ingresos para

  16. Demandas sociales y propiedad imperfecta en Veracruz: el impulso a la enfiteusis (1760-1811

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    Luis J. García Ruiz

    2015-09-01

    Full Text Available A partir del último tercio del siglo xviii, el Ayuntamiento, el ejército novohispano y el Consulado de Comerciantes de Veracruz se insertaron en un debate acerca de las políticas que había que implementar para remediar la escasez de población y el atraso de la agricultura. Plantearon la necesidad de que las tierras de manos muertas vinculadas a los mayorazgos fueran cedidas en enfiteusis, y no descansaron hasta lograr que el mayorazgo de la Higuera enajenara una de sus propiedades en beneficio del Ayuntamiento para posteriormente dividirla en enfiteusis entre los labradores. Se observará que este derecho imperfecto de propiedad era compatible con los proyectos de individualismo agrario y generación de ganancias a través de la agricultura, la industria y el comercio. Por esta razón, los actores políticos locales buscaron la creación de un marco institucional encaminado a fomentar la cesión de tierra a través de censos enfitéuticos

  17. A diversity and conservation inventory of the Herpetofauna of the Cuautlapan Valley, Veracruz, Mexico.

    Science.gov (United States)

    DE LA Luz, Nelson M Ceron; Lemos-Espinal, Julio A; Smith, Geoffrey R

    2016-12-05

    We compiled an inventory of the amphibians and reptiles of the Cuautlapan Valley, Veracruz, Mexico based on field surveys and museum and literature records. We found a total of 78 species: 28 amphibians (6 Salamanders and 22 anurans); and 50 reptiles (three turtles, 18 lizards, and 29 snakes). These taxa represent 26 families (eight amphibian families, 18 reptile families) and 60 genera (19 amphibian genera, 41 reptile genera). Two of these species are not native to the area (Rhinoclemmys pulcherrima and Hemidactylus frenatus). According to the IUCN red list, five species are Critically Endangered, two are Endangered, four are Near Threatened, and four are Vulnerable. In the SEMARNAT (Secretaría del Medio Ambiente y Recursos Naturales) listing, one species is Endangered, eight species are Threatened, and 25 are Subject to Special Protection. Even though the Cuautlapan Valley is represented by a relatively small area it hosts a rich diversity of amphibian and reptile species, many of which are at risk and protected under Mexican law. This valley lies between the growing cities of Orizaba and Cordoba which have contributed to habitat degradation threatening the existence of the wildlife that occurs there.

  18. PSYCHOLOGICAL AND SOCIO-ECONOMIC FACTORS IN DESIGN OF AGRICULTURAL PROGRAMMING IN RADIO TEOCELO, VERACRUZ

    Directory of Open Access Journals (Sweden)

    Antolin Silvestre Martiñón-Martínez

    2014-01-01

    Full Text Available The mass media, are an important complement in the agricultural extension, however, radio is the most economical mass media, so their potential is huge especially in rural areas. The present study was carried out at a community radio station (Radio Teocelo, with coffee producers, in three municipalities in the area Center of Veracruz, it should be noted that the radio has an audience formed mainly by agricultural producers, also this medium has been used for agricultural extension by the UNCADER (training unit for Rural Development, through an agricultural program called "The Moon in Uncader", with mainly technical information, however, it is necessary to propose relevant socio-economic issues that may be part of an optional agricultural programming, and/or complement the technical programming that is transmitted by the agricultural program. The study found a positive attitude to the proposed socio-economic issues, since most was obtained 80% of positive responses, highlighting the transmission of information on: marketing, government programs, visits to successful producers and transmission of successful cases of successful producers, also adopted a positive attitude for the program is disseminated by mass media mainly Teocelo Radio and are willing to personally spread mainly with friends.

  19. POTENTIAL TO PRODUCE Jatropha curcas L. AS FEEDSTOCK FOR BIODIESEL IN THE STATE OF VERACRUZ

    Directory of Open Access Journals (Sweden)

    Héctor Daniel Inurreta-Aguirre

    2013-11-01

    Full Text Available There is great interest to use from Jatropha curcas L. (J. curcas Las feedstock for biodiesel. In order to increase energy and economic efficiency, it is necessary to identify areas with optimal agroecological conditions for its cultivation and to determine its productivity in marginal areas to avoid competition with food production. The aim of this study was to determine the variation of the productive potential of J. curcas in response to different soil and climatic conditions of the state of Veracruz. The model used to simulate the seed yield of J. curcas was the Soil and Water Assessment Tool (SWAT. The units of calculation were the Hydrologic Response Units (HRU; the weather was extracted from 95 weather stations; Crop physiological parameters were taken from the literature. The simulated seed yield of J. curcas ranged from 0.16 to 5.74 t ha-1 and was mapped by grouping in 5 intervals. Superficies was quantified for each interval and related to the current land use. There were Identified 872 thousand hectares with seed yield higher than 3.63 t ha-1 in grasslands. The seed yield showed the most sensitivity to soil depth, followed by the mean annual temperature and annual total rainfall.

  20. Statistical analysis of wind power in the region of Veracruz (Mexico)

    Energy Technology Data Exchange (ETDEWEB)

    Cancino-Solorzano, Yoreley [Departamento de Ing Electrica-Electronica, Instituto Tecnologico de Veracruz, Calzada Miguel A. de Quevedo 2779, 91860 Veracruz (Mexico); Xiberta-Bernat, Jorge [Departamento de Energia, Escuela Tecnica Superior de Ingenieros de Minas, Universidad de Oviedo, C/Independencia, 13, 2a Planta, 33004 Oviedo (Spain)

    2009-06-15

    The capacity of the Mexican electricity sector faces the challenge of satisfying the demand of the 80 GW forecast by 2016. This value supposes a steady yearly average increase of some 4.9%. The electricity sector increases for the next eight years will be mainly made up of combined cycle power plants which could be a threat to the energy supply of the country due to the fact that the country is not self-sufficient in natural gas. As an alternative wind energy resource could be a more suitable option compared with combined cycle power plants. This option is backed by market trends indicating that wind technology costs will continue to decrease in the near future as has happened in recent years. Evaluation of the eolic potential in different areas of the country must be carried out in order to achieve the best use possible of this option. This paper gives a statistical analysis of the wind characteristics in the region of Veracruz. The daily, monthly and annual wind speed values have been studied together with their prevailing direction. The data analyzed correspond to five meteorological stations and two anemometric stations located in the aforementioned area. (author)

  1. Hexachlorocyclohexanes, Cyclodiene, Methoxychlor, and Heptachlor in Sediment of the Alvarado Lagoon System in Veracruz, Mexico

    Directory of Open Access Journals (Sweden)

    María del Refugio Castañeda-Chávez

    2018-01-01

    Full Text Available Organochlorine pesticides are used in agricultural areas and health campaigns, which reach the coastal environment through rivers, drains, runoffs, and atmospheric transport. In aquatic environments, they are adsorbed by particles of organic matter, depositing themselves in sediments in the bottom of these bodies, in which benthic organisms of commercial interest for human consumption inhabit. The objective of this research was to evaluate the concentration of organochlorine pesticides in sediment from the Alvarado lagoon system in Veracruz, Mexico. In 20 out of 41 sampling sites analyzed, 11 banned organochlorine pesticides were identified, such as hexachlorocyclohexane (HCH, lindane, aldrin, dieldrin, and endrin. The highest concentrations were as follows: aldrin: 46.05 ng g−1; β-HCH: 42.11 ng g−1; α-HCH: 38.44 ng g−1; gamma γ-HCH (lindane: 34.20 ng g−1; δ-HCH: 31.61 ng g−1; methoxychlor: 29.40 ng g−1; heptachlor epoxide: 25.70 ng g−1; heptachlor: 24.11 ng g−1; dieldrin: 22.13 ng g−1; endrin: 21.23 ng g−1; endrin aldehyde: 12.40 ng g−1. Concentrations reported are prohibited in international standards. There is a strong need to further evaluate, with scientific studies, the level of concentration reported by impact of compounds widely used in agricultural livestock activities.

  2. Organochlorine pesticide levels in adipose tissue of pregnant women in Veracruz, Mexico.

    Science.gov (United States)

    Herrero-Mercado, Margarita; Waliszewski, S M; Valencia-Quintana, R; Caba, M; Hernández-Chalate, F; García-Aguilar, E; Villalba, R

    2010-06-01

    DDT and Lindane (gamma-HCH) which were used until 1999 in Mexico, have provided great benefits in the combat of vectors that spread infection-borne diseases and in agriculture for crop protection. The persistence in the environment and their accumulative properties results in bioconcentration in lipid rich tissues of the human body that reflect the extent of environmental pollution. Human adipose tissue samples were taken during 2009 from abdominal cavities of 69 pregnant women by cesarean surgery and from 34 samples of control donors by autopsy in Veracruz State. The samples were analyzed by gas chromatography with ECD. The results of mean levels (mg/kg on fat basis) were higher in controls compared to pregnant women beta-HCH 0.064 vs 0.027; pp'DDE 1.187 vs. 0.745; op'DDT 0.016 vs. 0.011; pp'DDT 0.117 vs. 0.099 and Sigma-DDT 1.337 vs. 0.854. The pregnant women group was divided according to age: up to 20, 20-30, and more than 30 years, and presented an increase for the more persistent pesticides with age in terms of mean concentrations and a more pronounced higher correlation in medians levels. Pairing Body Mass Index to organochlorine pesticide mean levels revealed no correlation between these factors in pregnant women.

  3. Persistent organochlorine pesticides in two hylidae species from the La Antigua watershed, Veracruz, Mexico.

    Science.gov (United States)

    Valdespino, Carolina; Huerta-Peña, Aldo Israel; Pérez-Pacheco, Antonio; Rendón von Osten, Jaime

    2015-01-01

    Amphibians are good models for monitoring contaminants in ecosystems because they transfer xenobiotic substances throughout trophic networks. We quantified bioaccumulated POCs by capturing and sacrificing ninety-one frogs (Charadrahyla taeniopus and Ecnomiohyla miotympanum) from four riverine forests immersed in agriculture and pasture lands in the La Antigua, Veracruz, Mexico watershed. The concentrations of ∑DDTs, ∑HCHs, ∑Endosulphans, ∑Heptachlors, ∑Drines, and ∑Chlordanes were measured by gas chromatography and compared between species, sites and seasons. In E. miotympanum the concentration of ∑HCHs was highest at 4,746.46 μg/g, while in C. taeniopus that of the ∑DDTs was highest at 2,637.10 μg/g. Concentrations of ∑Endosulphans, ∑HCHs, ∑Chlordanes and ∑Drines differed between the two species, and were always higher in E. miotympanum. In E. miotympanum the concentration of ∑Drines differed between sites, while for C. taeniopus ∑Heptachlors differed between seasons and ∑Drines among sites. These findings indicate that the two frog species even bioconcentrate POCs that are banned and may disrupt their reproduction. The effect however may vary according to the site and the frog species.

  4. Apparent bioaccumulation of cylindrospermopsin and paralytic shellfish toxins by finfish in Lake Catemaco (Veracruz, Mexico).

    Science.gov (United States)

    Berry, J P; Jaja-Chimedza, A; Dávalos-Lind, L; Lind, O

    2012-01-01

    Compared to the well-characterized health threats associated with contamination of fish and shellfish by algal toxins in marine fisheries, the toxicological relevance of the bioaccumulation of toxins from cyanobacteria (blue-green algae), as the primary toxigenic algae in freshwater systems, remains relatively unknown. Lake Catemaco (Veracruz, Mexico) is a small, tropical lake system specifically characterized by a year-round dominance of the known toxigenic cyanobacterial genus, Cylindrospermopsis, and by low, but detectable, levels of both a cyanobacterial hepatotoxin, cylindrospermopsin (CYN), and paralytic shellfish toxins (PSTs). In the present study, we evaluated, using enzyme-linked immunoassay (ELISA), levels of both toxins in several species of finfish caught and consumed locally in the region to investigate the bioaccumulation of, and possible health threats associated with, these toxins as potential foodborne contaminants. ELISA detected levels of both CYN and PSTs in fish tissues from the lake. Levels were generally low (≤ 1 ng g(-1) tissue); however, calculated bioaccumulation factors (BAFs) indicate that toxin levels exceed the rather low levels in the water column and, consequently, indicated bioaccumulation (BAF >1). A reasonable correlation was observed between measured bioaccumulation of CYN and PSTs, possibly indicating a mutual source of both toxins, and most likely cells of Cylindrospermopsis, the dominant cyanobacteria in the lake, and a known producer of both metabolites. The potential roles of trophic transport in the system, as well as possible implications for human health with regards to bioaccumulation, are discussed.

  5. Prevalence of Trichomonas vaginalis and Human papillomavirus in female sex workers in Central Veracruz, Mexico.

    Science.gov (United States)

    Muñoz-Ramírez, Azucena; López-Monteon, Aracely; Ramos-Ligonio, Angel; Méndez-Bolaina, Enrique; Guapillo-Vargas, Mario R B

    2018-03-13

    Female sex workers (FSWs) have been considered a key population for sexually transmitted infections (STIs); therefore, they are periodically screened as a requirement to obtain a work card. However, there is insufficient epidemiological data on STIs among FSWs in Mexico. The detection of Trichomonas vaginalis is limited to microscopic studies and the molecular screening of Human papillomavirus (HPV) is only done to women 35 years of age and older. The objective of this study was to determine the prevalence of T. vaginalis and HPV infections in FSWs in the city of Orizaba, Veracruz, Mexico. Samples from 105 FSWs were obtained by cervical swab and analyzed. The identification of T. vaginalis and HPV was performed by molecular methods. HPV DNA was identified in 5.71% of the samples with the presence of HPV16, HPV18, and HPV58. A percentage of 25.7% samples were positive for T. vaginalis for optical microscopy and 23.8% for PCR. The results of the study indicate the need to incorporate more sensitive methods for the timely diagnosis of STIs as well as comprehensive health promotion programs directed to the most vulnerable groups among FSWs. Copyright © 2017 Asociación Argentina de Microbiología. Publicado por Elsevier España, S.L.U. All rights reserved.

  6. APORTES PARA EL ESTUDIO DEL TERRITORIO: LOS NAHUAS DE ZONGOLICA VERACRUZ

    Directory of Open Access Journals (Sweden)

    MARTHA INÉS FLORES PACHECO

    2014-10-01

    Full Text Available El estudio sobre el tema del territorio indígena es muy amplio y puede analizarse desde diferentes perspectivas teórico metodológicas, no obstante, este artículo lo aborda principalmente desde el enfoque de la antropología y el trabajo etnográfico. La región de estudio es la zona nahua de Zongolica donde se está realizando el proyecto de investigación intitulado: Políticas sociales y Pueblos Indígenas; turismo y patrimonio histórico, cultural y natural de la Región de las Montañas, Veracruz. En el presente artículo se exponen los avances de la revisión teórica sobre la territorialidad indígena y su vinculación con la cosmovisión indígena, los derechos indígenas y el patrimonio histórico cultural y natural, territorialidad que está siendo violentada por otros grupos sociales y acciones de desarrollo promovidas por el Estado Mexicano.

  7. Archaeometric study of the ceramics Tigrillo type from San Lorenzo Tenochtitlan, Veracruz, Mexico

    International Nuclear Information System (INIS)

    Guevara M, M.E.; Cruz O, J.C.; Cipres, A.

    2004-01-01

    The archaeological locality of San Lorenzo is situated in Veracruz, Mexico and is considered one of the most important olmec culture settlements. On of the most typical ceramic materials founded in this site is Tigrillo type. The typological classification of olmec pottery from San Lorenzo was determinate trough physic characteristics, however, this study suggest the existence of variability inside this typology. Seven Tigrillo samples were analysed by qualitative petrography, mineragraphy and X-ray Powder Diffraction. The relation between the clay and the fillers was determined. The data shows that the most important components of the pottery are montmorillonite, and the added materials are mica, feldspars, hematite, goethite-limonite and quartz; also, glass splinter and ceramic fragments were identified, these two components are not present in all samples. On the other hand, a correlation with a previous study about the regional soil was carried out, to understand the supply sources for the original clay. The preliminary results suggest that the clay was obtained from soils of the locality and the fillers were imported from near areas and then processed and used. (Author) 5 refs., 1 tab., 4 figs

  8. CARBON SEQUESTRATION IN PASTURES WITH TREES, TREELESS PASTURES AND DECIDUOUS FOREST FROM HUATUSCO, VERACRUZ

    Directory of Open Access Journals (Sweden)

    José Antonio Torres-Rivera

    2011-11-01

    Full Text Available It was compared the amount of carbon (C sequestered in a pasture with trees (P+Ar and in conventional treeless pastures (P and deciduous forest (BC, typical of the region of Huatusco, Veracruz, Mexico. Total C sequestered by the systems evaluated was 49.9, 63.0 and 469.8 ton ha-1 for P, P+Ar and BC, respectively. The system with the highest amount of C sequestered was BC, with almost equal proportions in the aerial (268.4 ton ha-1 and belowground parts (201.4 ton ha-1. The amount of C sequestered in the livestock systems represented about one tenth of that sequestered in BC, being higher the proportion obtained in P+Ar (13.4 % compared to P (10.6 %. In both livestock systems, a significantly greater amount of C was sequestered in the soil organic matter than in the aerial biomass, with 59.7 and 3.29 ton ha-1 in P+Ar, and with 48.2 and 1.78 ton ha-1 in P, respectively. It is expected that as trees of the P+Ar system gain volume, C sequestration will increase, especially in the aerial biomass.

  9. [Epidemiology of caprine brucellosis in the Central Zone of the State of Veracruz].

    Science.gov (United States)

    Román-Ramírez, Daniela Lucía; Martínez-Herrera, David Itzcoatl; Villagómez-Cortés, José Alfredo; Peniche-Cardeña, Álvaro Enrique de Jesús; Morales-Álvarez, José Francisco; Flores-Castro, Ricardo

    2017-01-01

    Brucellosis is a disease of high morbidity that affects several animal species, is transmitted to humans and, therefore, is a zoonosis. It is caused by bacteria of the genus Brucella. In this study we aim to determine seroprevalence, risk factors, and spatial distribution of caprine brucellosis in 14 municipalities in the central region of the state of Veracruz. This cross-stratified multistage study was conducted between 2009 and 2012. It included 572 animals of 81 production units selected by consensus according to the value tables of ​​Cannon and Roe. The diagnosis was by Card Testing and Radial Immunodiffusion. The seroprevalence was determined with the VassarStats® risk factor program and odds. The overall seroprevalence was 0.52% (95% CI: 0.13-1.65) and production units 2.47% (95% CI: 0.43-9.46). They were identified as risk factor for infection, production units in feedlot system and Card Testing seroconversion to vaccine against brucellosis; and as a protective factor, vaccination. Seroprevalence and distribution of goat brucellosis is low, the intensive system is a risk, and according with the Health Ministry in order that human cases are scarce.

  10. Statistical analysis of wind power in the region of Veracruz (Mexico)

    International Nuclear Information System (INIS)

    Cancino-Solorzano, Yoreley; Xiberta-Bernat, Jorge

    2009-01-01

    The capacity of the Mexican electricity sector faces the challenge of satisfying the demand of the 80 GW forecast by 2016. This value supposes a steady yearly average increase of some 4.9%. The electricity sector increases for the next eight years will be mainly made up of combined cycle power plants which could be a threat to the energy supply of the country due to the fact that the country is not self-sufficient in natural gas. As an alternative wind energy resource could be a more suitable option compared with combined cycle power plants. This option is backed by market trends indicating that wind technology costs will continue to decrease in the near future as has happened in recent years. Evaluation of the eolic potential in different areas of the country must be carried out in order to achieve the best use possible of this option. This paper gives a statistical analysis of the wind characteristics in the region of Veracruz. The daily, monthly and annual wind speed values have been studied together with their prevailing direction. The data analyzed correspond to five meteorological stations and two anemometric stations located in the aforementioned area. (author)

  11. Prevalencia de anticuerpos contra dengue y leptospira en la población de Jáltipan, Veracruz Prevalence of dengue and leptospira antibodies in the state of Veracruz, Mexico

    Directory of Open Access Journals (Sweden)

    Joel Navarrete-Espinosa

    2006-06-01

    Full Text Available OBJETIVO: Conocer la prevalencia de anticuerpos contra dengue y leptospira en Jáltipan, Veracruz, México MATERIAL Y MÉTODOS: Estudio transversal en 500 habitantes de Jáltipan, Veracruz, mediante un muestreo por hogares, aplicación de cuestionario y toma de muestras sanguíneas. Se buscaron anticuerpos IgG y se evaluaron factores asociados a sus seroprevalencias mediante regresión logística RESULTADOS: La seroprevalencia global para denguevirus fue 79.6% (IC95% 76-81; los principales factores vinculados con la infección fueron la edad (pOBJECTIVE: To discover the prevalence of antibodies against denguevirus and leptospira. MATERIAL AND METHODS: A cross-sectional study was carried out in 500 inhabitants of Veracruz, Mexico through household sampling, administration of a questionnaire and collection of blood samples. The presence of IgG antibodies was determined and factors associated with seroprevalence were evaluated using a logistic regression model. RESULTS: Total denguevirus seroprevalence was 79.6% (IC95% 76-81. The main factors associated with infection were age and residence in neighborhoods with higher vectorial indices (RMP=2.94, IC95% 1.46-6.1. Overall seroprevalence against leptospira was 4% (IC95% 2-6. Prevalence was higher in the 25 to 44 years age group (35%, IC95% 15-59. Seroprevalence in individuals who referred to living with dogs, pigs, cows and rats was 25% (IC95% 0.63-80. Eighty-five percent of individuals who were leptospira positive were also dengue positive. CONCLUSIONS: The prevalence of denguevirus antibodies suggests the risk of serious dengue hemorrhagic outbreaks. Although leptospirosis prevalence was low, the coexistence of both agents was confirmed.

  12. A new leech species of Semiscolex (Arhynchobdellida: Semiscolecidae) from Lake Catemaco, Veracruz, Mexico Especie nueva de sanguijuela del género Semiscolex (Arhynchobdellida: Semiscolecidae) del lago de Catemaco, Veracruz, México

    OpenAIRE

    Alejandro Oceguera-Figueroa

    2006-01-01

    Semiscolex lamothei sp. nov. from Catemaco lake, Veracruz, México, is described based on the examination of 18 specimens. The new species differs from other species of the genus by the presence of 1/2 + 5 + 1/2 annuli between gonopores. The new species has morphological features previously not described for any other member of the genus, such as well-developed ejaculatory bulbs and postcaeca in the posterior part of the crop. This is the first record of the genus and the family in the norther...

  13. Rendimiento de semilla y sus componentes en frijol bajo condiciones de acidez y sequía terminal en el sur de Veracruz.

    OpenAIRE

    Morales Rivera, Aurelio

    2014-01-01

    Se estudió la variabilidad en rendimiento de semilla y sus componentes, y producción de biomasa aérea en un grupo de variedades de frijol de color negro, nativas del sur de Veracruz y un grupo del tipo “Flor de Mayo”, introducidas del Altiplano, y la región central de México, en condiciones de acidez edáfica y sequía terminal en el Municipio de Juan Rodríguez Clara, Veracruz, en el ciclo otoño-invierno 2012-13. Se incluyeron ocho variedades comerciales liberadas por el INIFAP, un criollo de M...

  14. Cambios en la estructura y el funcionamiento de los agroecosistemas por migración familiar en Jamapa, Veracruz, México

    OpenAIRE

    Rosales Martínez, Verónica; Martínez Dávila, Juan Pablo; Galicia Galicia, Francisco

    2015-01-01

    El objetivo de esta investigación fue identificar el efecto de los patrones migratorios en los agroecosistemas de Jamapa, Veracruz, México. Actualmente, alrededor de 10% de la población mexicana radica fuera el país, principalmente en Estados Unidos de América, convirtiéndose en el fenómeno migratorio más importante a nivel mundial. Se aplicó una encuesta a 46 familias con miembros migrantes y a 54 sin ellos, durante marzo y abril de 2009 en el Municipio de Jamapa, Veracruz, México. Los migra...

  15. Epidemiología de la enfermedad de Chagas en el estado de Veracruz Epidemiology of Chagas disease in the state of Veracruz

    Directory of Open Access Journals (Sweden)

    Elsa L Segura

    2005-06-01

    Full Text Available OBJETIVO: Identificar la seroprevalencia de enfermedad de Chagas, los factores de riesgo de la vivienda e índices entomológicos, para proponer medidas de control en 11 jurisdicciones sanitarias del estado de Veracruz. MATERIAL Y MÉTODOS: Entre 1997 y 2001 se hizo un estudio transversal cuya muestra quedó integrada por 281 localidades, 2 526 viviendas y 9 782 individuos. Se aplicó un cuestionario sobre factores de riesgo, se tomó sangre en papel filtro y se buscaron triatominos en el intra y peridomicilio. Se obtuvo la prevalencia de exposición a factores de riesgo y de seropositividad para la enfermedad. Se hizo análisis bivariado mediante la razón de momios, ji de Mantel y Haenszel e intervalo de confianza a 95% como prueba de significancia estadística. El análisis multivariado se hizo mediante la regresión logística no condicional y se incluyeron las variables que durante el análisis bivariado mostraron un valor de p hasta de 0.20. El impacto potencial se estimó con base en la fracción etiológica en expuestos. RESULTADOS: La prevalencia de enfermedad de Chagas fluctuó entre 0 y 2.8%. Las jurisdicciones con mayor riesgo fueron Tuxpan, Pánuco y Córdoba, y sin riesgo, Orizaba. Los principales factores de riesgo de la vivienda fueron el techo y muro de palma/zacate y piso de tierra, así como la presencia del vector y la ventilación. CONCLUSIONES: Es necesario realizar vigilancia epidemiológica basada en educación para la salud, mejoramiento de la vivienda y uso de insecticidas.OBJECTIVE: To assess the seroprevalence, household risk factors, and entomological indicators, in order to frame control measures in 11 Sanitary Jurisdictions of the state. MATERIAL AND METHODS: This study included 281 towns, 2 526 households, and 9782 individuals. Data were collected using a questionnaire. Blood was obtained in filter paper and a search for triatomines was conducted inside of and around dwellings. Prevalence rates were used to

  16. Prevalencia de anticuerpos contra Trypanosoma cruzi en donadores de sangre del IMSS, Orizaba, Veracruz, México

    OpenAIRE

    Ramos-Ligonio Angel; Ramírez-Sánchez Michaía Elián; González-Hernández Juan Carlos; Rosales-Encina José Luis; López-Monteon Aracely

    2006-01-01

    OBJETIVO: Determinar la prevalencia de anticuerpos contra Trypanosoma cruzi en donadores del Hospital General Regional del Instituto Mexicano del Seguro Social (IMSS) en la ciudad de Orizaba, Veracruz. MATERIAL Y MÉTODOS: Se examinaron muestras de donadores del banco de sangre del Hospital General Regional (HGRO) del IMSS para la búsqueda de antiT. cruzi por ELISA, Western blot e IFI, utilizando una proteína recombinante (MBP::Hsp70) y un extracto crudo de epimastigotes. Las muestras fueron o...

  17. Investigación y análisis de la competitividad en el puerto de Veracruz (Estados Unidos Mexicanos)

    OpenAIRE

    Flórez Vanegas, Alejandra; Moreno Fonseca, William

    2016-01-01

    Esta investigación describe la situación portuaria del estado de Veracruz, ubicado en México, con el fin de analizar sus capacidades, infraestructura y funcionamiento, permitiendo una visualización de los modelos usados por el puerto, registrar sus prácticas, entre otros. Partiendo del funcionamiento, algunas estrategias y destrezas que se realizan en el puerto Azteca se tomarán como ejemplo, asimismo se realizará un análisis para el puerto de Buenaventura ubicado en Colombia. Lo anterior...

  18. Sistemas agro y silvopastoriles en El Limón, municipio de Paso de Ovejas, Veracruz, México

    OpenAIRE

    Bautista Tolentino, Marcelo

    2012-01-01

    La caracterización de los sistemas agroforestales es una buena herramienta que en su momento proporciona elementos de análisis para la toma de decisiones en sistemas de uso del suelo. El objetivo de la investigación fue caracterizar los sistemas agroforestales de acuerdo a sus componentes (agrícola, forestal y pecuario) y al principal uso de las especies arbóreas en la comunidad El Limón, municipio de Paso de Ovejas, Veracruz. Además evaluar la producción de biomasa vegetal y composición quím...

  19. Reflections on the Rural Land under Flexible Accumulation:the Case of the Coffee Producing Region of Coatepec, Veracruz, Mexico

    Directory of Open Access Journals (Sweden)

    Fabián González Luna

    2008-01-01

    Full Text Available This paper presents a debate about the territorial changes occurred in the coffee producing region of Coatepec, Veracruz, induced by the restructuring of the international agrifood market and by the change of agricultural policies in Mexico since the eighties, within the context of the new regime of flexible accumulation. Our work argues that the concept of territory is important to explain new realities in rural areas, particularly in a region of long coffee growing tradition, shaped by the regime of flexible accumulation. For this purpose, we use the results and experiences yielded by fieldwork in the region.

  20. Use and management of tree fodder resources on farms in central Veracruz, Mexico

    Directory of Open Access Journals (Sweden)

    L. Ascencio-Rojas

    2013-01-01

    Full Text Available Se realizó este estudio para determinar el uso y potencial de árboles y arbustos en 60 explotaciones ganaderas de los municipios de Tlapacoyan, Misantla y Martínez de la Torre, Veracruz, México. Los productores fueron encuestados con el objetivo de identificar, localizar y describir el uso de especies leñosas promisorias de interés forrajero, en tres sistemas de producción animal. Las encuestas registraron información acerca de: tamaño de la explotación, miembros (edad, escolaridad, años de experiencia de la familia, sistema de producción animal, manejo de pasturas, principales productos de la explotación; y la identificación, manejo y uso de árboles y arbustos en el sitio. Los datos se analizaron por estadísticos descriptivos como promedios y frecuencias relativas. Se caracterizaron tres sistemas de producción animal. Doble propósito (57%, cría y finalización (30%, y finalización en pasturas (13%; donde se identificaron 145 especies de árboles, siendo Bursera simaruba, Gliricidia sepium y Cedrela odorata las más comunes. Las dos primeras, de 12 especies fueron las más consumidas por el ganado, principalmente en ramoneo (38.80% o corte y acarreo (3.50%. El uso principal de estas especies fue: leña, carbón, madera y cercos vivos. El estudio mostró que existe una alta diversidad de especies leñosas de uso forrajero, con múltiples funciones en las explotaciones, destacando algunas especies como forrajeras, con un valor añadido en los sistemas de producción animal durante las épocas críticas del año.

  1. Detection of pathogenic Leptospira species associated with phyllostomid bats (Mammalia: Chiroptera) from Veracruz, Mexico.

    Science.gov (United States)

    Ballados-González, G G; Sánchez-Montes, S; Romero-Salas, D; Colunga Salas, P; Gutiérrez-Molina, R; León-Paniagua, L; Becker, I; Méndez-Ojeda, M L; Barrientos-Salcedo, C; Serna-Lagunes, R; Cruz-Romero, A

    2018-06-01

    The genus Leptospira encompass 22 species of spirochaetes, with ten pathogenic species that have been recorded in more than 160 mammals worldwide. In the last two decades, the numbers of records of these agents associated with bats have increased exponentially, particularly in America. Although order Chiroptera represents the second most diverse order of mammals in Mexico, and leptospirosis represents a human and veterinary problem in the country, few studies have been conducted to identify potential wildlife reservoirs. The aim of this study was to detect the presence and diversity of Leptospira sp. in communities of bats in an endemic state of leptospirosis in Mexico. During January to September 2016, 81 bats of ten species from three localities of Veracruz, Mexico, were collected with mist nets. Kidney samples were obtained from all specimens. For the detection of Leptospira sp., we amplified several genes using specific primers. Amplicons of the expected size were submitted to sequencing, and sequences recovered were compared with those of reference deposited in GenBank using the BLAST tool. To identify their phylogenetic position, we realized a reconstruction using maximum-likelihood (ML) method. Twenty-five samples from three bat species (Artibeus lituratus, Choeroniscus godmani and Desmodus rotundus) showed the presence of Leptospira DNA. Sequences recovered were close to Leptospira noguchii, Leptospira weilii and Leptospira interrogans. Our results include the first record of Leptospira in bats from Mexico and exhibit a high diversity of these pathogens circulating in the state. Due to the finding of a large number of positive wild animals, it is necessary to implement a surveillance system in populations of the positive bats as well as in related species, in order to understand their role as carriers of this bacterial genus. © 2018 Blackwell Verlag GmbH.

  2. PRODUCTIVIDAD Y RENTABILIDAD DEL CULTIVO DE FRIJOL CON FERTIRRIEGO EN VERACRUZ, MÉXICO

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    Francisco Javier Ugalde-Acosta

    2011-01-01

    Full Text Available El objetivo de este trabajo fue determinar el efecto del fertirriego en el cultivo de frijol en las zonas centro y sur del estado de Veracruz, México. Durante los ciclos invierno-primavera 2000 y 2001 se evaluaron tres tratamientos: 1 Riego rodado (por gravedad y fertilización sólida manual (testigo regional, con la dosis 40N-40P-0K (RR-40, 2 Riego por goteo y fertilización sólida manual, con la dosis 4N-40P-0K (RG-40; en ambos tratamientos se aplicó el fertilizante a los quince días de nacido el cultivo, y 3 riego por goteo y fertilización soluble, con la dosis 60N-60P-60K, aplicada en forma fraccionada durante el ciclo del cultivo (RG-60. De 2002 a 2005 se validó el mejor tratamiento y se realizó análisis económico para determinar su rentabilidad en comparación con el testigo regional. En la etapa de evaluación, con el tratamiento RG- 60 se redujo en 85% el gasto de agua y se obtuvo el mayor rendimiento promedio (2256 kg/ha, que superó en 145% al obtenido con RG-40 y en 186% al RR-40 (testigo regional. En la etapa de validación con riego por goteo y fertilización soluble fraccionada 60N-60-P-60K se obtuvo 110% más rendimiento que el testigo regional y mejor relación beneficio/ costo (1:1,80.

  3. Helminth Fauna Associated with Three Neotropical Bat Species (Chiroptera: Mormoopidae) in Veracruz, México.

    Science.gov (United States)

    Clarke-Crespo, Emilio; de León, Gerardo Pérez-Ponce; Montiel-Ortega, Salvador; Rubio-Godoy, Miguel

    2017-08-01

    Bats are recognized as potential hosts of pathogens exploiting the food chain to reach them as definitive hosts. However, very little is known about their endoparasites, especially for Neotropical bats. In this study, we assessed the helminth fauna associated with 3 insectivorous bat species roosting in the same single hot cave in central Veracruz, México: Mormoops megalophylla, Pteronotus davyi, and Pteronotus personatus. During a period of 1 yr (April 2007-2008), 135 mormoopid bats in total were collected and examined for helminths. Six parasite species representing 3 types of intestinal helminths were found: 1 cestode Vampirolepis elongatus; 2 trematodes Maxbraunium tubiporum and Ochoterenatrema labda; and 3 nematodes Linustrongylus pteronoti, Molineidae gen. sp., and Capillaria sp. Overall, trematodes were the most abundant parasite group (72.4%), followed by nematodes (20.7%) and cestodes (6.9%). Species-accumulation curves suggest that the worms collected (n = 1,331) from these 6 parasite species comprise the helminth fauna associated with the 3 bat populations studied. The only species shared by the 3 bat species was Capillaria sp. Most (5/6) of the helminth species recorded use Lepidoptera and Diptera as intermediate hosts; therefore, diet is likely the main source of infection. Although insectivorous bats are considered dietary generalist species, the differences found in helminth diversity in these sympatric populations of closely related bat species, suggest that diet partitioning occurs in mormoopid bat communities. Helminths tend to exploit the food chain to reach their final hosts; therefore, studying these parasites can provide useful information to further understand the biology of bats.

  4. Molecular characterization using ISSR primers of Magnolia mexicana DC. from two regions in Zongolica, Veracruz, Mexico

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    Jessica M. Medrano-Hernández

    2017-01-01

    Full Text Available Introducción: Magnolia mexicana DC . es una especie amenazada según la NOM-059-SEMARNAT-2010, situación atribuida a la fragmentación y destrucción del hábitat. No existen estudios sobre la diversidad genética de M. mexicana, a pesar de que es endémica de nuestro país. Objetivo: Evaluar la variabilidad genética en dos poblaciones de M. mexicana mediante marcadores moleculares tipo ISSR. Materiales y métodos: Las colectas provienen de Amatitla y Zapotla en Zongolica, Veracruz. El ADN se extrajo de las hojas jóvenes. Se probaron 55 iniciadores ISSR, se seleccionaron los 10 que produjeron mayor número de bandas con polimorfismo y se amplificaron por PCR. Resultados y discusión: Los iniciadores ISSR mostraron 86 % de polimorfismo. El análisis de agrupamiento, con el método de varianza mínima de Ward, fue capaz de separar las colectas por su procedencia geográfica. El análisis de varianza molecular demostró que la mayor variabilidad (90.88 % se encuentra dentro de cada población. El índice de diversidad de Shannon-Weaver fue de 0.47 y 0.41 para Amatitla y Zapotla, respectivamente. Conclusión: Las poblaciones de M. mexicana no han sufrido cambios en su estructura genética; no hay evidencia, a nivel genético, de alteraciones ocasionadas por la reducción de poblaciones o fragmentación del hábitat.

  5. A new leech species of Semiscolex (Arhynchobdellida: Semiscolecidae from Lake Catemaco, Veracruz, Mexico Especie nueva de sanguijuela del género Semiscolex (Arhynchobdellida: Semiscolecidae del lago de Catemaco, Veracruz, México

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    Alejandro Oceguera-Figueroa

    2006-12-01

    Full Text Available Semiscolex lamothei sp. nov. from Catemaco lake, Veracruz, México, is described based on the examination of 18 specimens. The new species differs from other species of the genus by the presence of 1/2 + 5 + 1/2 annuli between gonopores. The new species has morphological features previously not described for any other member of the genus, such as well-developed ejaculatory bulbs and postcaeca in the posterior part of the crop. This is the first record of the genus and the family in the northern hemisphere of the Americas.Se describe Semiscolex lamothei sp. nov. del lago de Catemaco, Veracruz, México con base en 18 ejemplares. Se diferencia del resto de las especies del género por presentar 1/2 + 5 + 1/2 anillos entre los gonoporos. Esta nueva especie del género Semiscolex presenta características morfológicas no descritas en otros miembros del grupo, como bulbos eyaculadores bien desarrollados y postciegos en la región terminal del buche. Es el primer registro del género y de la familia en el hemisferio norte del continente americano.

  6. Criterios geológico-hidrológicos para recomendaciones del uso de suelo en zonas conurbadas sujetas a afectaciones por lluvias intensas. Caso de estudio: sur de la ciudad de Tuxtla Gutiérrez, Chiapas

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    Gloria Espíritu Tlatempa

    2013-03-01

    Full Text Available Actualmente en la zona conurbana sur de la ciudad de Tuxtla Gutiérrez se manifiestan movimientos geológicos en donde la urbanización promueve su propia vulnerabilidad principalmente ante lluvias intensas provocadas por fenómenos hidrometeorológicos como tormentas tropicales y huracanes, e incluso de lluvias ordinarias, impactando además a otras partes bajas de la ciudad. Este trabajo determina zonas potencialmente activas e inactivas y su vulnerabilidad física en cuatro cuencas a escala 1:20 000, lo que permite integrar criterios que identifican localmente a los procesos evolutivos de movimientos de masas en laderas, determinando escenarios temporales de actividad peligrosa. Para la obtención de elementos categóricos, los resultados muestran los peligros diferenciados en geológicos y los que tendrán su máximo desarrollo en lluvias extraordinarias; de los cuales se deriva a la determinación de sitios para la conservación, rehabilitación y con menor restricción de uso urbano.

  7. Determinantes de la transmisión de dengue en Veracruz: un abordaje ecológico para su control Dengue fever transmission in Veracruz, Mexico: an ecological approach to disease control

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    Javier Escobar-Mesa

    2003-01-01

    Full Text Available OBJETIVO: Identificar los factores ambientales, sociales y demográficos que contribuyen a explicar las diferencias en la transmisión de dengue en Veracruz, México, durante el periodo 1995-1998 y definir las áreas de riesgo para promover un mejor control del problema. MATERIAL Y MÉTODOS: Bajo un diseño ecológico se analizó una base de datos con el número de casos de dengue que se presentaron en 1 249 localidades en las 11 Jurisdicciones Sanitarias del estado de Veracruz durante el periodo 1995-1998. Cada una de las localidades fue identificada de acuerdo con su altitud, latitud y longitud, y con el número total de la población por sexo, el número de viviendas y la dotación de servicios públicos. Se tomó también el índice de marginación por localidad del Consejo Nacional de Población. RESULTADOS: El dengue en Veracruz se registró en 17% de las localidades y en sólo 6% de ellas se concentraron 70% de los casos de dengue en el estado. Las localidades repetidoras de dengue fueron grandes centros urbanos, con baja marginación y extensa dotación de servicios públicos. El dengue sí se transmite en las áreas rurales del estado aunque la transmisión es ocasional. El promedio de casos de dengue reportados en las localidades dependió del tamaño de la misma y del número de años que reportaron dengue durante el periodo. Se reporta un umbral poblacional para la transmisión. CONCLUSIONES: Se identificaron las localidades repetidoras de dengue que concentran 70% de los casos, y las determinantes sociales y ambientales de la transmisión. Este enfoque de riesgo puede mejorar el control y tener un impacto significativo en la prevención de la transmisión en las zonas de mayor riesgo.OBJECTIVE:To assess the ecological, social, and demographic factors associated with the transmission of dengue virus infection in Veracruz, Mexico, and to identify risk areas to target control measures. MATERIAL AND METHODS: This ecological study

  8. Population structure and fecundity in Uca virens Salmon & Atsaides, 1968 (Decapoda: Ocypodidae in southern Tamiahua Lagoon, Veracruz, Mexico

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    Víctor del Castillo

    2015-03-01

    Full Text Available Fiddler crabs are common decapods of intertidal zones; thirteen species have been reported along the coast of the Gulf of Mexico, inhabiting different zones. For the southern region of the Tamiahua Lagoon, Veracruz, Mexico, five species have been identified: Uca panacea, U. rapax, U. spinicarpa, U. virens and U. vocator particularly in the southern region of the Tamiahua Lagoon, Veracruz, Mexico. Here we analysed the fecundity of U. virens in 25 ovigerous females out of 387 individuals collected between December 2008 and December 2009 during eight field trips and from five collection sites. Morphological measurements like carapace length (CL and carapace width (CW, and total wet weight (TWW for all individuals collected were taken, and total egg number was counted for ovigerous females . The total population was divided in nine size class intervals. Total egg number varied between 3,617 and 41,099. Egg number increased with CW (ranging from 9.0 to 18.6 mm CW and TWW. Values of fecundity observed for U. virens in Tamiahua Lagoon vs other Uca species were similar to results reported in literature.

  9. INTERNATIONAL MIGRATION AND TECHNOLOGICAL MANAGEMENT IN COFFEE PRODUCTION IN TWO COMMUNITIES IN THE CENTRAL AREA OF VERACRUZ STATE

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    Martha Elena Nava-Tablada

    2011-07-01

    Full Text Available Veracruz comes third in terms of national coffee production; however this sector is facing a crisis because of the fall in prices in the international market which has resulted amongst other things in increased emigration to the United States. The aim of this study was to analyze the relationship between migration and the level of technology employed in coffee production in two communities in the central area of Veracruz State: Capulapa and Zapoapan. Information was obtained through observation and by interviewing the members of 46 family production units (FPU. In Zapoapan, the FPUs which presented the highest level of technological management in their coffee plantations were those with greatest access to capital, as they are more extensive, produce other crops than coffee, have more family members in the United States and receive greater remittances; investing 14% more in agriculture. In the case of the FPUs in Capulapa, no relationship was observed between the number of international emigrants, the amount of remittances received and the level of technological management. This may be because 83% of the FPUs cultivate solely coffee and are beholden to the ups and downs of the international market, thus their socio-economic situation is more precarious and 86% of remittances are directed towards family sustenance; with only 7% directed towards agricultural investment.

  10. La expedición a Veracruz y la defensa de San Juan de Ulúa (1819-1825

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    Manuel Escalona Jiménez

    2000-01-01

    Full Text Available En 1819 una expedición militar al mando del teniente general Manuel Cagigal partió de Cádiz hacia La Habana. En 1821 el cuerpo expedicionario, compuesto de unos 200 hombres, ocupó Veracruz, pero pronto se vio obligado a replegarse a la isla de San Juan de Ulúa, donde consiguió resistir hasta 1825, a pesar de estar sometido al severo bloqueo de las fuerzas independentistas mexicanas y combatir en las condiciones más precarias, de tal modo que este episodio militar se ganó la admiración general.In 1819, a military expedition, under the command of Lieutenant General Manuel Cagigal, sailed from Cádiz bound to La Habana. In 1821, the army corps, around 200 soldiers, got hold of Veracruz, but was soon obliged to retire to the island of San Juan de Ulúa, where they managed to resist untill 1825, in spite of the blockade by the Mexican independentist Mexican force and the arduous circumstances of the fight to the extent of getting a general admiration.

  11. Cadmium, copper and lead in macroalgae from the Veracruz Reef System, Gulf of Mexico: Spatial distribution and rainy season variability

    International Nuclear Information System (INIS)

    Horta-Puga, Guillermo; Cházaro-Olvera, Sergio; Winfield, Ignacio; Avila-Romero, Marisol; Moreno-Ramírez, Margarita

    2013-01-01

    Highlights: ► Cd, Cu, and Pb were determined in macroalgae from Veracruz Reefs, Gulf of Mexico. ► Mean concentrations were lower or similar to those from other coastal areas. ► Cd and Pb levels are controlled by fluvial discharge. ► Sediment scavenging also controls environmental trace metal levels. ► Pb environmental concentrations have been decreasing in the lasts two decades. -- Abstract: This study focused on the spatial distribution of trace metals in the Veracruz Reef System in the Southern Gulf of Mexico, and its variability in the early (July) and late (September) rainy season of 2008, by analyzing the concentration of Cd, Cu and Pb in benthic macroalgae. Mean concentrations are lower (Pb 295 ± 347 ng g −1 , Cd 17.9 ± 15.0 ng g −1 ), or similar (Cu 3.4 ± 4.5 μg g −1 ) to those reported from other coastal areas. Cd and Pb concentrations are influenced by the discharge of the Jamapa River, evidencing a fluvial control on coastal trace metal levels. Also, Cd and Cu concentrations were lower in the late rainy season, when there is a high load of suspended sediments derived from fluvial discharge, which probably adsorb dissolved metals decreasing their bioavailability. Pb concentrations have been decreasing in the last two decades in the SGM, after the banning of leaded-gasoline in the late 20th century

  12. The use of ecological niche modeling to infer potential risk areas of snakebite in the Mexican state of Veracruz.

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    Carlos Yañez-Arenas

    Full Text Available Many authors have claimed that snakebite risk is associated with human population density, human activities, and snake behavior. Here we analyzed whether environmental suitability of vipers can be used as an indicator of snakebite risk. We tested several hypotheses to explain snakebite incidence, through the construction of models incorporating both environmental suitability and socioeconomic variables in Veracruz, Mexico.Ecological niche modeling (ENM was used to estimate potential geographic and ecological distributions of nine viper species' in Veracruz. We calculated the distance to the species' niche centroid (DNC; this distance may be associated with a prediction of abundance. We found significant inverse relationships between snakebites and DNCs of common vipers (Crotalus simus and Bothrops asper, explaining respectively 15% and almost 35% of variation in snakebite incidence. Additionally, DNCs for these two vipers, in combination with marginalization of human populations, accounted for 76% of variation in incidence.Our results suggest that niche modeling and niche-centroid distance approaches can be used to mapping distributions of environmental suitability for venomous snakes; combining this ecological information with socioeconomic factors may help with inferring potential risk areas for snakebites, since hospital data are often biased (especially when incidences are low.

  13. The use of ecological niche modeling to infer potential risk areas of snakebite in the Mexican state of Veracruz.

    Science.gov (United States)

    Yañez-Arenas, Carlos; Peterson, A Townsend; Mokondoko, Pierre; Rojas-Soto, Octavio; Martínez-Meyer, Enrique

    2014-01-01

    Many authors have claimed that snakebite risk is associated with human population density, human activities, and snake behavior. Here we analyzed whether environmental suitability of vipers can be used as an indicator of snakebite risk. We tested several hypotheses to explain snakebite incidence, through the construction of models incorporating both environmental suitability and socioeconomic variables in Veracruz, Mexico. Ecological niche modeling (ENM) was used to estimate potential geographic and ecological distributions of nine viper species' in Veracruz. We calculated the distance to the species' niche centroid (DNC); this distance may be associated with a prediction of abundance. We found significant inverse relationships between snakebites and DNCs of common vipers (Crotalus simus and Bothrops asper), explaining respectively 15% and almost 35% of variation in snakebite incidence. Additionally, DNCs for these two vipers, in combination with marginalization of human populations, accounted for 76% of variation in incidence. Our results suggest that niche modeling and niche-centroid distance approaches can be used to mapping distributions of environmental suitability for venomous snakes; combining this ecological information with socioeconomic factors may help with inferring potential risk areas for snakebites, since hospital data are often biased (especially when incidences are low).

  14. Seroepidemiology of infection with Neospora caninum, Leptospira, and bovine herpesvirus type 1 in water buffaloes (Bubalus bubalis) in Veracruz State, Mexico

    Science.gov (United States)

    We aimed to determine the seroprevalence of infection with N. caninum, Leptospira, and bovine herpesvirus type 1 and risk factors associated with these infections in water buffaloes in Veracruz State, Mexico. Through a cross-sectional study, 144 water buffaloes (Bubalus bubalis) raised in 5 ranches ...

  15. A "Great Roads" Approach to Teaching Modern World History and Latin American Regional Survey Courses: A Veracruz to Mexico City Case Study.

    Science.gov (United States)

    Brown, James Seay, Jr.; Sullivan-Gonzalez, Douglass

    2002-01-01

    Outlines an innovative way of teaching "World History Since 1500" at Samford University (Birmingham, Alabama) called the "great roads" approach, centered upon important roads in a country's history. Presents the "Veracruz to Mexico City corridor" case study used to teach a Latin American modern history course. (CMK)

  16. The Discourse of Interculturality and Its Transnational Migration: Towards a Comparative Analysis of Its Appropriation by Academic and Political Actors in the State of Veracruz

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    Cortes, Laura Selene Mateos

    2009-01-01

    This paper analyses the ways in which social and educational networks are being configured around the actors participating in the increasingly transnational field of intercultural education both at the Universidad Veracruzana Intercultural and the Veracruz State Ministry of Education. It starts by defining the notion of discursive migration as…

  17. Genetic structure of populations of Drosophila melanogaster natives from Laguna Verde, Veracruz

    International Nuclear Information System (INIS)

    Salceda, V.M.

    2005-01-01

    The genetic variability hidden present in natural populations of Drosophila melanogaster, it has been broadly analyzed, and it is a tool that allows to detect differences among the different populations of this species, so much of natural nature as experimental. In this occasion we use it to see if differences exist in two neighboring populations inside the Laguna Verde nuclear power plant, Veracruz, and this way to suggest, of having differences in the mount of the relative frequencies of lethal genes, semi lethals and normal, be due to the radioactive emanations product of the reactors operation of the plant. Its were took samples of flies in both towns during three successive seasons and they were transported to the laboratory of the ININ where they were carried out the tests to determine the frequency of the different types of genes. This was made by means of the denominated technique C y L / Pm that allows by means of a cross series with a stump marker to obtain, in the third generation, in isolated form the different types of genes and this way to calculate their relative frequencies. The study understands the analysis of 299 chromosomes extracted from the populations, of those that 95 correspond at the control population and 204 to the experimental one. As a result of the analysis we find that 30.52 percent of the genes of the population witness contains detrimental genes (sum of the lethal plus the semi lethal genes) as long as in the experimental population this value corresponds to 23.03 percent. In accordance with this information was not significant difference among the studied populations. A similar analysis, but now comparing the seasons, (summer against winter), it showed significant difference to 5% with regard to the lethal genes frequency only in the population witness. These results indicate the absence of damage, however it is necessary to consider that this can be due to that indeed there is not him or that the investigation protocol is not

  18. [Frequency of NAFLD in a group of patients with metabolic syndrome in Veracruz, Mexico].

    Science.gov (United States)

    Roesch-Dietlen, Federico; Dorantes-Cuéllar, Alicia; Carrillo-Toledo, Maria Graciela; Martínez-Sibaja, Cristina; Rojas-Carrera, Sonia; Bonilla-Rojas, Q C Sashenka; Uchino-Higueras, Virginia; Lagunas, Teresa; Carrasco-Arróniz, Miguel Angel; Soler-Leal, Bertha; León-Valdivieso, Johnatan; Cid-Juárez, Silvia; Martínez, José Angel

    2006-01-01

    Nonalcoholic fatty liver disease is a very common disease that is being described principally in obese, diabetic and hiperlipidemic patients without significant alcohol consumption (less than 28 ethanol Units per week). Nowadays it is considered as the hepatic manifestation of the metabolic syndrome. The frequency of Non Alcoholic Sreatohepatic (NASH) is 30 to 35% in general population, but it reaches to 70% in patients whose Body Mass Index (BMI) is above 30 kg/m2 as it occurs with diabetic patients. In Mexico there are only isolated reports about it's frequency, nearly 7.1% in general population and 18.5% in diabetic patients. To know the frequency of the Nonalcoholic fatty liver disease in patients who receive medical attention at the city of Veracruz. We studied 337 patients, who were divided into 4 groups: Normal Weight, Overweight, Obese and Diabetes type 2 patients. The individuals who reported previous hepatitis and alcohol consumption were excluded. All patients made a test in order to determinate: age, gender, presence of hepatic stigmata and complaints. Laboratory tests were done to all patients including: Blood glucose, seric lipids, transaminases, proteins and alkaline phosphatase. In those cases with impairment in transaminases results, it was done upper abdominal ultrasound (USG) and hepatic biopsy, in patients who accepted. We identified 53 cases (15.72%) with characteristics of Nonalcoholic fatty liver disease. The frequency in patient with normal weight and overweight was 7.14% to 7.76%, while in obese subjects it was 14.15% and 28% in diabetic patients; 73.58% of all patients were female and the other 28.41% were males. The average age of the group was 48.11 years, it was similar the specific age of the normal weight and obese patients, in overweight patients was 61.5 years and the average age in diabetics was 56.42 years. There were significant differences in the results of blood glucose level, glycosilated hemoglobin, cholesterol, seric lipid

  19. Genotyping and spatial analysis of pulmonary tuberculosis and diabetes cases in the state of Veracruz, Mexico.

    Science.gov (United States)

    Blanco-Guillot, Francles; Castañeda-Cediel, M Lucía; Cruz-Hervert, Pablo; Ferreyra-Reyes, Leticia; Delgado-Sánchez, Guadalupe; Ferreira-Guerrero, Elizabeth; Montero-Campos, Rogelio; Bobadilla-Del-Valle, Miriam; Martínez-Gamboa, Rosa Areli; Torres-González, Pedro; Téllez-Vazquez, Norma; Canizales-Quintero, Sergio; Yanes-Lane, Mercedes; Mongua-Rodríguez, Norma; Ponce-de-León, Alfredo; Sifuentes-Osornio, José; García-García, Lourdes

    2018-01-01

    Genotyping and georeferencing in tuberculosis (TB) have been used to characterize the distribution of the disease and occurrence of transmission within specific groups and communities. The objective of this study was to test the hypothesis that diabetes mellitus (DM) and pulmonary TB may occur in spatial and molecular aggregations. Retrospective cohort study of patients with pulmonary TB. The study area included 12 municipalities in the Sanitary Jurisdiction of Orizaba, Veracruz, México. Patients with acid-fast bacilli in sputum smears and/or Mycobacterium tuberculosis in sputum cultures were recruited from 1995 to 2010. Clinical (standardized questionnaire, physical examination, chest X-ray, blood glucose test and HIV test), microbiological, epidemiological, and molecular evaluations were carried out. Patients were considered "genotype-clustered" if two or more isolates from different patients were identified within 12 months of each other and had six or more IS6110 bands in an identical pattern, or 20 years were diagnosed with pulmonary TB; 33% had DM. The proportion of isolates that were genotyped was 80.7% (n = 1105), of which 31% (n = 342) were grouped in 91 genotype clusters with 2 to 23 patients each; 65.9% of total clusters were small (2 members) involving 35.08% of patients. Twenty three (22.7) percent of cases were classified as recent transmission. Moran`s I indicated that distribution of patients in IS6110-RFLP/spoligotype clusters was not random (Moran`s I = 0.035468, Z value = 7.0, p = 0.00). Local spatial analysis showed statistically significant spatial aggregation of patients in IS6110-RFLP/spoligotype clusters identifying "hotspots" and "coldspots". GI* statistic showed that the hotspot for spatial clustering was located in Camerino Z. Mendoza municipality; 14.6% (50/342) of patients in genotype clusters were located in a hotspot; of these, 60% (30/50) lived with DM. Using logistic regression the statistically significant variables associated

  20. Determinantes de la transmisión de dengue en Veracruz: un abordaje ecológico para su control

    Directory of Open Access Journals (Sweden)

    Escobar-Mesa Javier

    2003-01-01

    Full Text Available OBJETIVO: Identificar los factores ambientales, sociales y demográficos que contribuyen a explicar las diferencias en la transmisión de dengue en Veracruz, México, durante el periodo 1995-1998 y definir las áreas de riesgo para promover un mejor control del problema. MATERIAL Y MÉTODOS: Bajo un diseño ecológico se analizó una base de datos con el número de casos de dengue que se presentaron en 1 249 localidades en las 11 Jurisdicciones Sanitarias del estado de Veracruz durante el periodo 1995-1998. Cada una de las localidades fue identificada de acuerdo con su altitud, latitud y longitud, y con el número total de la población por sexo, el número de viviendas y la dotación de servicios públicos. Se tomó también el índice de marginación por localidad del Consejo Nacional de Población. RESULTADOS: El dengue en Veracruz se registró en 17% de las localidades y en sólo 6% de ellas se concentraron 70% de los casos de dengue en el estado. Las localidades repetidoras de dengue fueron grandes centros urbanos, con baja marginación y extensa dotación de servicios públicos. El dengue sí se transmite en las áreas rurales del estado aunque la transmisión es ocasional. El promedio de casos de dengue reportados en las localidades dependió del tamaño de la misma y del número de años que reportaron dengue durante el periodo. Se reporta un umbral poblacional para la transmisión. CONCLUSIONES: Se identificaron las localidades repetidoras de dengue que concentran 70% de los casos, y las determinantes sociales y ambientales de la transmisión. Este enfoque de riesgo puede mejorar el control y tener un impacto significativo en la prevención de la transmisión en las zonas de mayor riesgo.

  1. Biodiversidad antropoentomofágica de la región de Zongolica, Veracruz, México

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    Julieta Ramos-Elorduy

    2008-03-01

    Full Text Available Durante dos años y medio (2003-2005 se rastrearon a los insectos que se ingieren en el área de Zongolica, Veracruz: para ello se entrevistó a la gente de ese municipio (200, para conocer cuáles especies ingerían. El total de especies registradas, ascendió a 57 distribuidas en los órdenes Orthoptera, Hemiptera, Homoptera, Megaloptera, Coleoptera, Lepidoptera e Hymenoptera, correspondiendo el mayor consumo al primer orden. De las especies registradas, 24 son nuevos registros de insectos comestibles para México. Estos se consumen tanto en estado inmaduro como en estado adulto y generalmente se ingieren asados. Hay una secuenciación estacional en el consumo de las diferentes especies y algunas de ellas (las cucarachas, la cuetla, la cuecla, los chapulines, los toritos, etc. se comercializan en los tianguis (puestos de venta callejeros informales que se realizan un día a la semana en diversos lugares del país o en el día de mercado en Zongolica. Existe el "protococultivo" de tres especies: una cucaracha (Periplaneta australasiae Fabricius y dos mariposas (Latebraria amphipyroides Guenée y Arsenura armida armida Cramer. La antropoentomofagía es un hábito ancestral en Zongolica.Anthropoentomophagic biodiversity of the Zongolica region, Veracruz, Mexico. During two and a half years (2003-2005 we recorded the insect species used as food at Zongolica, Veracruz State, Mexico. Interviews were made among people (200 of this municipality to know which insects they consumed. The total of registered species was 57 (Orthoptera, Hemiptera, Homoptera, Megaloptera, Coleoptera, Lepidoptera and Hymenoptera. The Orthoptera was the most frequently ingested. Twenty-four of these species were new records for edible insects of Mexico. They are eaten in immature stages or as adults, generally only roasted. Consumption is seasonal. Some species are commercialized in the "tianguis" (little town markets and/or in the larger Zongolica market. There is a

  2. La primera migración laboral en las poblaciones rurales del sur de Veracruz, México

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    Alberto DEL-REY-POVEDA

    2010-01-01

    Full Text Available El objetivo de este trabajo es analizar los determinantes que han afectado a la primera migración laboral de las poblaciones rurales situadas en el sur del estado de Veracruz. Utilizando la Encuesta sobre Movilidad y Reproducción Social en la Región del Sotavento (Moreso realizada en 1999 se ha aplicado un modelo de supervivencia en tiempo discreto a tres generaciones de hombres: nacidos antes de 1950, nacidos entre 1950 y 1969 y nacidos a partir de 1970. Los resultados señalan diferentes riesgos y determinantes para cada una de las generaciones como consecuencia del cambiante contexto laboral en la región y en particular, de la disponibilidad de tierra agrícola.

  3. Critical approaches to the institutional interventions and citizens practices in the historical center of Xalapa, Veracruz, Mexico

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    Polimnia Zacarías Capistrán

    2018-05-01

    Full Text Available This article explores the notion of historical center and its implications on the main models of institutional intervention, against the emergence of citizenship practices and ways of living builders of city heritage. Taking the city of Xalapa, Veracruz, Mexico as a reference, the study emphasizes the epistemic forms that arise from relating the idea of heritage, with those of public space, habitability and sustainability, to inscribe there the question about architecture and its project process. If it is in the urban area where the risks and contradictions of the global economy are most reflected, and it is the city where new ethics and community spaces take place, the questions that motivate this investigation are how shall the project practice be conceived today? What are its theoretical and epistemological implications and what are its strategies for the preservation of local and global patrimonial environments?

  4. Catchment rainwater and cloud water in the dry season in the city of Xalapa, Veracruz, México

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    Paulo César Parada Molina

    2017-07-01

    Full Text Available This paper evaluates the amount of rainwater and fog captured and its relation with average consumption at the dwelling level in the city of Xalapa, Veracruz, Mexico, during the period from November 2012 to February 2013. Rainwater is quantified by means of rocker gauges installed on the roofs of houses and fog through an omnidirectional collector commonly known as a rope collector. It is observed that the amount of rainwater collected monthly can represent 20 to 35% of the average monthly consumption, demonstrating that the rainwater harvesting is an alternative supply to meet domestic needs in the dry season. As for the amount of fog captured its values are low although it should highlight the large amount that the vegetation naturally captures.

  5. Poder civil y derechos naturales de los indios americanos según Fray Alonso de la Veracruz

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    Manuel Méndez Alonzo

    2013-01-01

    Full Text Available El presente trabajo investiga las tesis sobre el poder civil de Alonso de la Veracruz que buscan incorporar en la comunidad política española a los habitantes autóctonos del Nuevo Mundo, tesis que suelen relacionarse con F. de Vitoria y el tomismo español, y que últimamente son consideradas parte del republicanismo novohispano elaborado desde la periferia americana. Se busca demostrar que su propósito era aplicar una teoría de derechos naturales, sin que ello implique participación política de los indios americanos. Se analiza la postura del fraile frente a la diversidad cultural y la guerra contra los indios.

  6. PBDEs, PCBs, and DDE in eggs and their impacts on aplomado falcons (Falco femoralis) from Chihuahua and Veracruz, Mexico.

    Science.gov (United States)

    Mora, M A; Baxter, C; Sericano, J L; Montoya, A B; Gallardo, J C; Rodríguez-Salazar, J R

    2011-12-01

    Eggs from aplomado falcons (Falco femoralis septentrionalis) nesting in Chihuahua and Veracruz, Mexico, were analyzed for organochlorine pesticides, PCBs, and PBDEs. p,p'-DDE was the only organochlorine found in all eggs at concentrations ranging from 0.13 to 7.85 μg/g wet weight. PCBs ranged from 0.04 to 2.80 μg/g wet weight and PBDEs from 62 to 798 ng/g lipid weight. DDE concentrations in eggs were not significantly different among regions; however, PCBs were significantly greater (P = 0.015) in Tinaja Verde, Chihuahua than in the other three regions. Also, PBDEs were significantly higher (P Mexico. Copyright © 2011 Elsevier Ltd. All rights reserved.

  7. El nacimiento del paisaje petrolero en la región de Poza Rica [Veracruz], México

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    María Luisa Martell Contreras

    2012-12-01

    Full Text Available La localización de yacimientos y la extracción de petróleo en el Norte de Veracruz (México, han sido desde hace 60 años, actividades importantes para el desarrollo de la economía del país. El gran auge que la industria del petróleo ha tenido en esta región, ha modificado de forma drástica el paisaje; además de que ha impactado de forma directa, en los ámbitos sociales y económicos. El presente artículo pretende dar un breve panorama, de la manera en que la actividad petrolera ha influido en la transformación del paisaje.

  8. Perception of emotional relationship with parents as the main factor that influence on teen pregnancy in Veracruz, Mexico

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    Karina Ivonne Trinidad-Noguera

    2015-04-01

    Full Text Available A qualitative study was conducted in the VIFAC house at Veracruz, Mexico; pregnant teenagers who attended this institution where interviewed. Based on the data obtained from the investigation, we observed risk factors that exponentially increased that teenage girls between 12 and 19 years of age get pregnant, viewed from the perspective of own teenager. This study was conducted on a sample of 16 participants divided in two groups, one of pregnant teenagers and one with parent and / or guardian of these, so get a broader situation of each scenario and to evaluate how each of the factors were influencing their environment so that pregnancy is arrived at such young age, for which we apply two types of semi-structured interview depending on the group to which they belonged.

  9. Microfinanzas y reducción de la vulnerabilidad: propuestas de microseguro para Veracruz, México

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    Nidia Hidalgo

    2005-01-01

    Full Text Available Desde el campo de las microfinanzas, surge una herramienta denominada "microseguro" y definida como: seguros dirigidos a las personas de bajos ingresos. Esta herramienta tiene como fin contribuir a la reducción de la vulnerabilidad de dicho sector. El presente trabajo propone dos esquemas de microseguro a partir de la revisión de experiencias a nivel internacional y nacional, y de un análisis cualitativo del mercado. A través de grupos focales con mujeres de bajos ingresos, organizadas en torno a proyectos de microfinanzas, y entrevistas con aseguradoras comerciales se analizó la oferta y demanda potencial del microseguro en Veracruz. Se concluye que el microseguro abrirá un nuevo horizonte para el campo de los seguros y de la protección social.

  10. Mountain cloud forest and grown-shade coffee plantations: A comparison of tree biodiversity in central Veracruz, Mexico

    Directory of Open Access Journals (Sweden)

    Alfredo González-Zamora

    2016-04-01

    Full Text Available Aim of the study: The objective of this work is to compare tree diversity and richness among one grown-shade coffee plantation (CAE and two sites of montane cloud forests, one preserved (MCF1 and other perturbed (MCF2. We also develop an analysis of the importance of coffee plantations as a refuge of tree species, holding a potential role for conservation.Area of study: Our study area is the coffee region of Coatepec-Xico, in the state of Veracruz, Mexico.Material and methods: We compiled a list of all tree species in each site to determine tree diversity and floristic similarity (dissimilarity. We used different similarity indices and a cluster analysis to show relations among sites.Main results: 2721 individuals from 154 species were registered in the montane cloud forests as a whole. In the grown-shade coffee plantation we registered 2947 individuals from 64 species. The most similar sites were the perturbed montane cloud forest and the grown-shade coffee plantation and the least similar were the preserved montane cloud forest and the grown-shade coffee plantation. The high biodiversity found in all sites and the differences in tree composition between the two montane cloud forests supports evidence of the ecosystems richness in the region.Research highlight: Diversity differences among sites determine that the grown-shade coffee plantation is not substitute for montane cloud forest. CAE’s are developed under similar environmental conditions than the MCF; therefore, coexistence and recombination (replacement of species make them particularly complementary. CAE’s in Veracruz have a potential role as refuge for biodiversity.

  11. PAISAJES Y ECONOMIA FRAGIL: ECOSISTEMAS Y AGROECOSISTEMAS EN LA CUENCA COATEPEC-LA ANTIGUA, VERACRUZ MÉXICO

    Directory of Open Access Journals (Sweden)

    Ana Lid Del Angel-Pérez

    2011-03-01

    Full Text Available El objetivo del trabajo fue obtener índices de fragilidad del paisaje  (IFP como una forma de proporcionar datos confiables para el uso sostenible del suelo en la Cuenca Coatepec- La Antigua, Veracruz, México. Se incorporó un transecto altitudinal de colecta de datos de paisaje, desde los 3200 m en la cara oriental  del cofre de Perote, hasta el nivel de mar, cerca de la ciudad de Veracruz. Se utilizaron datos del inventario nacional forestal y cartas de uso del suelo para, con sistemas de información geográficos para generar imágenes que muestran la fragilidad de los paisajes por uso del suelo. Los datos geográficos fueron contrastados con las características socioeconómicas de la región y el valor social de los paisajes para la población que los habita. Los resultados muestran que los IFP altos (5, se localizan en el 2.8 % del paisaje, el 22.5 % se clasificaron como medio-alto (4, e inciden en zonas de bosque, selva mediana y selva alta, en la zona de montaña.  Las áreas más frágiles se localizan en las partes altas de la Cuenca, lo cual coincide con los mayores índices de marginalidad, mayor densidad de población y factores de fragilidad socioeconómica como flujo migratorio internacional y menor ingreso.

  12. PBDEs, PCBs, and DDE in eggs and their impacts on aplomado falcons (Falco femoralis) from Chihuahua and Veracruz, Mexico

    International Nuclear Information System (INIS)

    Mora, M.A.; Baxter, C.; Sericano, J.L.; Montoya, A.B.; Gallardo, J.C.; Rodriguez-Salazar, J.R.

    2011-01-01

    Eggs from aplomado falcons (Falco femoralis septentrionalis) nesting in Chihuahua and Veracruz, Mexico, were analyzed for organochlorine pesticides, PCBs, and PBDEs. p,p'-DDE was the only organochlorine found in all eggs at concentrations ranging from 0.13 to 7.85 μg/g wet weight. PCBs ranged from 0.04 to 2.80 μg/g wet weight and PBDEs from 62 to 798 ng/g lipid weight. DDE concentrations in eggs were not significantly different among regions; however, PCBs were significantly greater (P = 0.015) in Tinaja Verde, Chihuahua than in the other three regions. Also, PBDEs were significantly higher (P < 0.0001) in eggs from Veracruz than in those from Chihuahua. DDE concentrations in eggs were much lower than those associated with eggshell thinning. PBDEs and PCBs were lower than those reported in raptors from industrialized countries. Overall, contaminant concentrations observed suggest no likely impact on hatching success. The PBDE concentrations are among the first to be reported in raptor species in Mexico. - Highlights: → We analyzed environmental contaminants in eggs of aplomado falcons from Mexico. → Of all the organochlorine pesticides, only p,p'-DDE was detected in all the eggs. → Eggshell thickness was 20% thicker than the reported in eggshells from the 1970s. → Total PCBs and PBDEs were lower than those reported in industrialized countries. → Aplomado falcons in Mexico are currently not affected by DDE, PCBs, or PBDEs. - PBDEs, PCBs, and p,p'-DDE were not elevated in eggs and not likely to impact aplomado falcons in eastern and northern Mexico.

  13. Mountain cloud forest and grown-shade coffee plantations: A comparison of tree biodiversity in central Veracruz, Mexico

    Energy Technology Data Exchange (ETDEWEB)

    González-Zamora, A.; Esperón-Rodríguez, M.; Barradas, V.L.

    2016-07-01

    Aim of study: The objective of this work is to compare tree diversity and richness among one grown-shade coffee plantation (CAE) and two sites of montane cloud forests, one preserved (MCF1) and other perturbed (MCF2). We also develop an analysis of the importance of coffee plantations as a refuge of tree species, holding a potential role for conservation. Area of study: Our study area is the coffee region of Coatepec-Xico, in the state of Veracruz, Mexico. Material and methods: We compiled a list of all tree species in each site to determine tree diversity and floristic similarity (dissimilarity). We used different similarity indices and a cluster analysis to show relations among sites. Main results: 2721 individuals from 154 species were registered in the montane cloud forests as a whole. In the grown-shade coffee plantation we registered 2947 individuals from 64 species. The most similar sites were the perturbed montane cloud forest and the grown-shade coffee plantation and the least similar were the preserved montane cloud forest and the grown-shade coffee plantation. The high biodiversity found in all sites and the differences in tree composition between the two montane cloud forests supports evidence of the ecosystems richness in the region. Research highlight: Diversity differences among sites determine that the grown-shade coffee plantation is not substitute for montane cloud forest. CAE’s are developed under similar environmental conditions than the MCF; therefore, coexistence and recombination (replacement) of species make them particularly complementary. CAE’s in Veracruz have a potential role as refuge for biodiversity. (Author)

  14. PBDEs, PCBs, and DDE in eggs and their impacts on aplomado falcons (Falco femoralis) from Chihuahua and Veracruz, Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Mora, M.A., E-mail: mmora@tamu.edu [Department of Wildlife and Fisheries Sciences, Texas A and M University, College Station, TX 77843-2258 (United States); Baxter, C. [Department of Wildlife and Fisheries Sciences, Texas A and M University, College Station, TX 77843-2258 (United States); Sericano, J.L. [Geochemical and Environmental Research Group, Texas A and M University, College Station, TX 77845 (United States); Montoya, A.B. [The Peregrine Fund, Inc, Boise, ID 83709 (United States); Gallardo, J.C. [Instituto de Neuroetologia, Universidad Veracruzana, Xalapa, Veracruz 91190 (Mexico); Rodriguez-Salazar, J.R. [The Peregrine Fund, Inc, Boise, ID 83709 (United States)

    2011-12-15

    Eggs from aplomado falcons (Falco femoralis septentrionalis) nesting in Chihuahua and Veracruz, Mexico, were analyzed for organochlorine pesticides, PCBs, and PBDEs. p,p'-DDE was the only organochlorine found in all eggs at concentrations ranging from 0.13 to 7.85 {mu}g/g wet weight. PCBs ranged from 0.04 to 2.80 {mu}g/g wet weight and PBDEs from 62 to 798 ng/g lipid weight. DDE concentrations in eggs were not significantly different among regions; however, PCBs were significantly greater (P = 0.015) in Tinaja Verde, Chihuahua than in the other three regions. Also, PBDEs were significantly higher (P < 0.0001) in eggs from Veracruz than in those from Chihuahua. DDE concentrations in eggs were much lower than those associated with eggshell thinning. PBDEs and PCBs were lower than those reported in raptors from industrialized countries. Overall, contaminant concentrations observed suggest no likely impact on hatching success. The PBDE concentrations are among the first to be reported in raptor species in Mexico. - Highlights: > We analyzed environmental contaminants in eggs of aplomado falcons from Mexico. > Of all the organochlorine pesticides, only p,p'-DDE was detected in all the eggs. > Eggshell thickness was 20% thicker than the reported in eggshells from the 1970s. > Total PCBs and PBDEs were lower than those reported in industrialized countries. > Aplomado falcons in Mexico are currently not affected by DDE, PCBs, or PBDEs. - PBDEs, PCBs, and p,p'-DDE were not elevated in eggs and not likely to impact aplomado falcons in eastern and northern Mexico.

  15. Reconversión de la cadena agroindustrial de la caña de azúcar en Veracruz México

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    Noé Aguilar Rivera

    2014-01-01

    Full Text Available La agroindustria azucarera de Veracruz participa con 40 % de la producción nacional de sacarosa e integra actividades agrícolas de crecimiento, cosecha y transporte de caña de azúcar con la producción industrial en ingenios azucareros, destilerias y trapiches piloncilleros. Sin embargo, enfrenta retos con la caída de la productividad y aspectos socioeconómicos que ponen en riesgo la seguridad alimentaria y la reconversión de la agroindustria. El objetivo del presente trabajo es evaluar la capacidad y estrategias de reconversión de la agroindustria azucarera de Veracruz mediante el análisis de la productividad de la cadena agroindustrial en el contexto nacional con el uso de diversas herramientas de análisis como Matriz de ponderación de productividad en campo, ingenios azucareros y municipios productores, zonificación agroecológica y diamante de competitividad. Los resultados establecen que el 40 % de los ingenios azucareros poseen indicadores por encima de la media nacional. Las zonas de abasto cañero presentan en su conjunto 12 % menor productividad en relación a su potencial agroecológico, a pesar que en Veracruz el 57.5 % de su zona productora tiene aptitud edafoclimática al cultivo de media a alta y 30 municipios (33.7 % poseen recursos y capacidades para reconvertirse. Se concluye que las acciones y estrategias para incrementar la productividad para bioenergía y alimentos en Veracruz debe abordarse desde una perspectiva interdisciplinaria como una interfaz entre la optimización del rendimiento, la ecología, limitantes técnicos y socioeconómicos y la nutrición humana como una cuestión de eficiencia de los recursos disponibles.

  16. Características hidrográficas de la vertiente del Golfo de México en el estado de Veracruz

    Directory of Open Access Journals (Sweden)

    Arturo Jiménez Román

    1979-01-01

    Full Text Available In the first part of his study an attempt is made to see which are the more significative causes that, from tire physical point of view, determine the features of the rivers that cross the State of Veracruz. In the second part are trying the more important profit of the hydrological resource into the region. Finally, the third part contains some aspects of water pollution in these currents.

  17. Proposal of Organizational Innovation for The Creation of Sme’s Products Exotic in A Community Indigenous Totonaca in Papantla, Veracruz, Mexico

    OpenAIRE

    Dra. Bertha Alicia Arce Castro; Dr. Jorge Ramírez Juárez; Dra. Rosa María Sánchez Hernández

    2013-01-01

    In this work we’re given the results obtained after a year of improvement and application of a new model called Model of organizational change for the creation of small and medium-sized companies in non-traditional products, into a Totonaca a community in Veracruz, Mexico. Thisproposal has been designed to answer the under treatment of technical literature about rural family business, satisfying the lack of General models, which doesn’t respond to identified needs in farming communities with ...

  18. Sobrepeso y obesidad en indígenas nahuas de Ixtaczoquitlán, Veracruz, México Overweight and obesity in indigenous nahuas from Ixtaczoquitlán, Veracruz, Mexico

    Directory of Open Access Journals (Sweden)

    Emma V Herrera-Huerta

    2012-09-01

    Full Text Available El estudio tuvo como objetivo determinar la frecuencia de sobrepeso y obesidad en indígenas nahuas de Ixtaczoquitlán, Veracruz, México. Para ello, se realizó un estudio transversal entre los años 2010-2011; donde se calculó el índice de masa corporal (IMC. Para la definición de sobrepeso y obesidad se emplearon las categorías de la Organización Mundial de la Salud (OMS y los de la Norma Oficial Mexicana (NOM. Se incluyó 227 nahuas (77,5% mujeres. Según los lineamientos de la OMS, la proporción de nahuas con sobrepeso fue de 41%, y de obesidad 36,5%; y según la NOM fue de 11,4 y 69,2% respectivamente. En conclusión, la frecuencia de sobrepeso y obesidad en indígenas nahuas es alta. Deben realizarse estudios enfocados a determinar la prevalencia y factores de riesgo y, con ello, desarrollar estrategias de prevención que mejoren la calidad de salud de estas poblacionesThe study was aimed at determining the prevalence of overweight and obesity in indigenous nahuas from Ixtaczoquitlán, Veracruz, Mexico. For this purpose, a cross-cut study was conducted between 2010 and 2011, in which the body mass index (BMI was calculated. To define overweight and obesity, the categories of the World Health Organization (WHO and the Mexican Official Standard (NOM, Spanish acronym were used. 227 nahuas (77,5% women were included. According to WHO’s guidelines, the rate for overweight among nahuas was 41%, and 36.5% for obesity; according to NOM, it was 11.4 and 69.2% respectively. In conclusion, the prevalence of overweight and obesity among indigenous nahuas is high. Studies should be conducted to determine the prevalence and risk factors in order to develop prevention strategies based on this information to improve the health quality of these populations

  19. Prevalencia de anticuerpos contra Trypanosoma cruzi en donadores de sangre del IMSS, Orizaba, Veracruz, México Prevalence of antibodies against Trypanossoma cruzi in blood bank donors from the IMSS General Hospital in Onizaba, Veracruz, Mexico

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    Angel Ramos-Ligonio

    2006-02-01

    Full Text Available OBJETIVO: Determinar la prevalencia de anticuerpos contra Trypanosoma cruzi en donadores del Hospital General Regional del Instituto Mexicano del Seguro Social (IMSS en la ciudad de Orizaba, Veracruz. MATERIAL Y MÉTODOS: Se examinaron muestras de donadores del banco de sangre del Hospital General Regional (HGRO del IMSS para la búsqueda de antiT. cruzi por ELISA, Western blot e IFI, utilizando una proteína recombinante (MBP::Hsp70 y un extracto crudo de epimastigotes. Las muestras fueron obtenidas entre los meses de octubre de 2001 a enero de 2002. RESULTADOS: Los 420 donadores de sangre analizados fueron seronegativos para HBV, HCV, BrA, VDRL y HIV. Después del tamizaje de los 420 donadores, se identificaron dos individuos seropositivos por las pruebas de ELISA, Western blot e IFI, con una seroprevalencia de 0.48%. CONCLUSIONES: En este estudio se muestran evidencias de seropositividad para T. cruzi en donadores de sangre del HGRO, lo que sugiere la existencia de riesgo de contaminación por transfusión sanguínea. Por tal motivo, es necesario aplicar programas para el tamizaje serológico a través de técnicas inmunológicas con alta sensibilidad y especificidad.OBJECTIVE: To estimate the prevalence of antibodies against Trypanosoma cruzi in blood donors from Hospital General Regional (HGRO of the Mexican Institute of Social Security (IMSS per its abbreviation in Spanish. MATERIAL AND METHODS: Between October 2001 and January 2002, blood samples were collected from voluntary donors at the blood bank of the Hospital General Regional of IMSS in Orizaba; Veracruz, Mexico. The samples were assayed for anti-T. cruzi by ELISA, Western blot and IFI, using a recombinant protein (MBP::Hsp70, and crude extract from epimastigotes. RESULTS: A total of 420 blood donors were studied; two of them were seropositive for ELISA, Western blot and IFI, with a seroprevalence of 0.48%. CONCLUSIONS: Some blood donors at the HGRO hospital were seropositive for T

  20. Abundancia de dos poblaciones de toninas (Tursiops truncatus en el norte de Veracruz, México Abundance of two populations of bottlenose dolphins (Tursiops truncatus in northern Veracruz, Mexico

    Directory of Open Access Journals (Sweden)

    Michelle P. Valdes-Arellanes

    2011-03-01

    Full Text Available En México no se conoce el tamaño de las poblaciones de la tonina (Tursiops truncatus debido a su gran movilidad y al ocasional intercambio de individuos entre poblaciones. El objetivo de este estudio fue determinar la abundancia de toninas en la zona norte de Veracruz. De marzo de 2005 a diciembre de 2007 se realizaron 50 navegaciones con un esfuerzo total de 236.7 horas. Los resultados obtenidos de la foto-identificación de toninas, se emplearon en el modelo Jolly-Seber y se estimó con este modelo un total de N=302 ±113 organismos para toda el área de estudio. Para Tamiahua, se estimó una población de N=177 ± 10 delfines y para Tuxpan N=161 ± 68 delfines. Estos resultados sugieren que existe un mínimo intercambio de delfines entre zonas y por tanto, las poblaciones no están aisladas; sin embargo, los organismos tienen preferencia por ciertas áreas. La foto-recaptura de algunos individuos en la zona de Tamiahua confirma que la fidelidad al sitio se ha mantenido por 13 años. Es probable que esto se deba a que cada una de las zonas presenta estuarios con alta productividad que son ideales para refugio y crianza de las toninas.In Mexico, the population size of the bottlenose dolphin (Tursiops truncatus is unknown, due to the fact that they are highly mobile, and occasionally there are exchanges of individuals between populations. The objective of this study was to determine the abundance of dolphins in the north of Veracruz. From March 2005 to December 2007 were 50 surveys with a total effort of 236.7 hours. The results of the photo-identification of dolphins were used in the Jolly-Seber model, and with this model we estimated a total of N = 302 ± 113 dolphins throughout the study area. For Tamiahua a population estimate of N = 177 ± 10 dolphins, and for Tuxpan N = 161 ± 68 dolphins. These results suggest that there is minimal exchange of dolphins between areas; therefore it is assumed that populations are not isolated but dolphins

  1. LA ENSEÑANZA DE LA CIENCIA EN EL SISTEMA TECNOLÓGICO DE VERACRUZ: UNA PERSPECTIVA DE GÉNERO / SCIENCE EDUCATION IN THE TECHNOLOGICAL SYSTEM OF VERACRUZ: A GENDER PERSPECTIVE

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    Manuel Villarruel-Fuentes

    2017-06-01

    Full Text Available RESUMEN: Desde sus inicios la actividad científica se ha concebido como una ocupación propia del género masculino. A pesar de los esfuerzos por incorporar a las mujeres en las comunidades de investigación científica, aún queda mucho por hacer. Con base en lo anterior, se realizó un estudio cuyo objetivo fue identificar y comparar, bajo una perspectiva de género, los tipos de enseñanza y aprendizaje que se desarrollan dentro de los Institutos Tecnológicos del estado de Veracruz, México. Para ello se aplicó un instrumento ad hoc con ítems cerrados y de opción múltiple, con el que se evaluaron los modelos didácticos que emplean los maestros dentro de estos planteles. El estudio, exploratorio-descriptivo y expost-facto, se realizó en 9 instituciones y 396 estudiantes (55.8% hombres y 44.2% mujeres que participaban en un proyecto de investigación. Los resultados mostraron que los maestros, sin importar el género, privilegian el aprendizaje experimental por descubrimiento, atendiendo las premisas del aprendizaje significativo y el constructivismo, siendo necesario reforzar los escenarios de aprendizaje y las estrategias didácticas que emplean, orientándolos hacia modelos alternativos, principalmente en el enfoque Ciencia-Tecnología-Sociedad. ABSTRACT: Since the beginning, science activity has been conceived as a male-gender occupation. Despite the efforts to bring women into scientific research communities, there is still much to be done. In view of the foregoing, a study was conducted with the aim to identify, with a gender-based approach, the types of teaching and learning styles at the technological institutes in the state of Veracruz, Mexico. For that purpose, an instrument with closed-ended and multiple-choice items was applied to assess the teaching models used by teachers of those institutes. This exploratory, descriptive and ex post facto study covered 9 institutes and 396 students (55.8% men and 44.2% women who were

  2. Investigación sobre epidemiología convencional y molecular de tuberculosis en Orizaba, Veracruz, 1995-2008 Research on conventional and molecular epidemiology of tuberculosis in Orizaba, Veracruz, 1995-2008

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    Ma Eugenia Jiménez-Corona

    2009-01-01

    Full Text Available Se describen los resultados de investigación del Consorcio Mexicano contra la Tuberculosis, en la Jurisdicción Sanitaria de Orizaba, Veracruz, entre 1995 y 2008. Las aportaciones principales de los trabajos se refieren a los siguientes rubros: 1. Epidemiología convencional y molecular (medición de la carga de la enfermedad, tendencias, factores de riesgo y grupos vulnerables; descripción de las consecuencias de la farmacorresistencia e identificación de factores que favorecen la transmisión en la comunidad y en los hospitales. 2. Desarrollo de técnicas rápidas para conservación de muestras respiratorias que permitan el aislamiento y diagnóstico de farmacorresistencia de M. tuberculosis en campo. 3. Evaluación de la prueba tuberculínica, respuesta inmunológica al Bacilo de Calmette-Guerin (BCG, biomarcadores de la respuesta inmunitaria y medidas de control. 4. Comentarios en torno a aspectos éticos de la investigación en tuberculosis. Además se describe el impacto en políticas públicas, la transferencia de tecnología, la formación de recursos humanos y las perspectivas a futuro.This study describes the achievements of the Mexican Consortium against Tuberculosis, in the Sanitary District of Orizaba, Veracruz, Mexico between 1995 and 2008. In brief, the main results can be classified as follows: 1 Conventional and molecular epidemiology (measurement of burden of disease, trends, risk factors and vulnerable groups, consequences of drug resistance, identification of factors that favor nosocomial and community transmission; 2 Development of diagnostic techniques to detect drug resistance, description of circulating clones and adaptation of simple techniques to be used in the field; 3 Evaluation of usefulness of tuberculin skin test, immunologic responses to BCG, impact of directly observed therapy for tuberculosis (DOTS, and study of immunological biomarkers and 4 Comments on ethical aspects of tuberculosis research. Additionally

  3. Barriers and facilitating factors for disease self-management: a qualitative analysis of perceptions of patients receiving care for type 2 diabetes and/or hypertension in San José, Costa Rica and Tuxtla Gutiérrez, Mexico.

    Science.gov (United States)

    Fort, Meredith P; Alvarado-Molina, Nadia; Peña, Liz; Mendoza Montano, Carlos; Murrillo, Sandra; Martínez, Homero

    2013-09-04

    The burden of cardiovascular disease is growing in the Mesoamerican region. Patients' disease self-management is an important contributor to control of cardiovascular disease. Few studies have explored factors that facilitate and inhibit disease self-management in patients with type 2 diabetes and hypertension in urban settings in the region. This article presents patients' perceptions of barriers and facilitating factors to disease self-management, and offers considerations for health care professionals in how to support them. In 2011, 12 focus groups were conducted with a total of 70 adults with type 2 diabetes and/or hypertension who attended urban public health centers in San José, Costa Rica and Tuxtla Gutiérrez, Chiapas, Mexico. Focus group discussions were transcribed and coded using a content analysis approach to identify themes. Themes were organized using the trans-theoretical model, and other themes that transcend the individual level were also considered. Patients were at different stages in their readiness-to-change, and barriers and facilitating factors are presented for each stage. Barriers to disease self-management included: not accepting the disease, lack of information about symptoms, vertical communication between providers and patients, difficulty negotiating work and health care commitments, perception of healthy food as expensive or not filling, difficulty adhering to treatment and weight loss plans, additional health complications, and health care becoming monotonous. Factors facilitating disease self-management included: a family member's positive experience, sense of urgency, accessible health care services and guidance from providers, inclusive communication, and family and community support.Financial difficulty, gender roles, differences by disease type, faith, and implications for families and their support were identified as cross-cutting themes that may add an additional layer of complexity to disease management at any stage. These

  4. Potencial de cambio en las capacidades humanas de los docentes de educación básica en la región socioeducativa de Tuxtla Gutiérrez, Chiapas, México

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    Irán Guadalupe RODRÍGUEZ RAMÍREZ

    2016-09-01

    Full Text Available La investigación que se presenta fue desarrollada dentro del campo de los estudios regionales y con visión transdisciplinar. Tuvo como objetivo deconstruir conjuntamente con los participantes, las capacidades humanas regionales de nosotros los docentes de educación básica, en nuestros procesos de reflexión entre teoría y práctica, en los que se consideraron las condicionantes estructurales, en niveles macro y micro regionales, con el alcance de haber identificado el potencial de cambio en nuestra praxis de docente como acción ante nuestros alumnos, quienes configuran el tejido social de Tuxtla Gutiérrez. Desde una perspectiva sociocrítica, se tomó como punto de fuga o núcleo la teoría crítica con fundamento filosófico en la escuela de Fráncfort y con una postura epistemológica basada en el construccionismo por la estrecha relación sujeto-objeto en el estudio; por ende se empleó la metodología investigaciónacción a través de diversas técnicas e instrumentos. Los resultados fueron concentrados en categorías que facilitaron su discusión: primeramente con el potencial de cambio, que adquirió significado mediante el desarrollo de las capacidades de reflexión y conciencia del docente; luego se presentaron las capacidades humanas, de nosotros los docentes, en las que destacaron como base de otras, las capacidades de amor, autoestima y compromiso. Posteriormente, se describió la reflexión docente sobre la concepción del beneficio personal hacia el beneficio colectivo. Finalmente, se discutió sobre la proyección de la acción docente dentro de la relación alumno y región. Se concluyó que las capacidades humanas y el potencial de cambio, deconstruidos conjuntamente con los docentes participantes, fueron la respuesta del proceso investigativo en un determinado tiempo y espacio, como posibilidades de acción docente hacia la tan deseada transformación socioeducativa regional.

  5. EATING HABITS, DIETARY DIVERSITY AND APTITUDE FOR PRACTICING HORTICULTURE OF PERI-URBAN FAMILIES FROM CARDEL, VERACRUZ, MEXICO

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    Marco Antonio Toral Juárez

    2012-11-01

    Full Text Available The urban and peri-urban families represent 75% of the Mexican population. The poverty and form of feed seem to be associated with obesity, degenerative diseases and malnutrition. Therefore, the aim of this study was to evaluate the eating habits and dietary diversity of Cardel city, Veracruz, Mexico peri-urban families and know the aptitude of families to practice horticulture at home. Dietary diversity was determined using the scoring method of staple foods. Eating habits and aptitude to practice horticulture were obtained by a survey type Likert scale. The 35% of the families presented good eating habits, 19% regular and 46% of households showed poor dietary habits. Dietary diversity was 29.4 ± 8.7 in primary foods. The Likert general index was 2.9 and represented an average availability to practice peri-urban horticulture. Food diversity of families peri-urban is a function of family economic capacity, in contrast, food habits and socioeconomic status are not associated and finally there were identified multiple factors that positively influence the willingness of the mother of family to practice horticulture.

  6. PREVALENCE OF Cryptosporidium spp. AND ASSOCIATED RISK FACTORS IN FEMALE CALVES IN THE CENTRAL REGION OF VERACRUZ, MEXICO

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    Dora Romero Salas

    2012-11-01

    Full Text Available The objective of the study was to determine the prevalence of Cryptosporidium spp. and its associated risk factors in female calves in central Veracruz, Mexico. A cross-sectional study with a convenience sampling was conducted. One fecal sample was obtained from each of 120 female calves. The lateral flow immunochromatographic (LFIC and the Ziehl-Neelsen (ZN tests were performed. A questionnaire was applied in each farm to obtain individual and herd information. Overall prevalence was 3.33% (CI95% 1-8 through LFIC and 12.50% (CI95% 8-20 through ZN. Prevalence by municipality was 0 to 9.1% (CI95% 0.03-0.24 through LFIC and 0 to 30.43% (CI95% 16-51 through ZN. Prevalence by age was 0% at 31-45 days and 9.10% at 1-15 days through LFIC, and 0% at 31-45 days and 18.8% at 1-15 days through ZN. The calves with diarrhea had the highest prevalence, which was 14.3% (CI95% 3-51 through LFIC and 57.1% (CI95% 25-84 through ZN. The protective factors were calves housed in individual stalls, compared with those in common stalls but separated one from the other (OR=0.27; 0.09-0.85, P

  7. Ranching Elites, Social Networks and Everyday Disobedience in Southern Veracruz at the End of the 18th Century

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    Álvaro Alcántara López

    2007-01-01

    Full Text Available This text centers on the interaction between kinship networks and the subaltern attitudes of everyday disobedience expressed in a pluriethnic fabric of dissidence. Based on the disputes between the Indians of Acayucan and a large rancher and landholder, Don Joseph Quintero, this text reveals the history of a family of great importance in southern Veracruz: the Franyutti family. Making his fortune through marriage alliances, Juan Francisco Franyutti maintained control over such administrative and judicial posts as mayor, tithe collector, tax collector, militia captain and notary. In his time, he established an ironclad system of control over the region’s agricultural and livestock production, monopolizing land and control over trade and credit. Resistance to the power of the Franyutti family included strategies employed by Indians, pardos and mulattoes that ranged from tax fraud to smuggling, from legal defenses to gossiping and rioting, as well as through ritualized forms of dissidence, such as fandangos and saraos. These conflicting networks not only expressed different modes of sociability, but also strategies of social cohesion and friction.

  8. Las microalgas de Tillandsia multicaulis Steud. (Bromeliaceae de la Reserva Ecológica “La Martinica”, Veracruz

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    Brisceida Hernández-Rodríguez

    2014-01-01

    Full Text Available Las bromelias tienen la capacidad de retener agua en las axilas de las hojas lo que es conocido como tanques o fitotelmata; mantienen cadenas tróficas complejas con todo tipo de organismos, desde bacterias hasta vertebrados pequeños. En este trabajo, presentamos la primera aproximación a las microalgas que viven en las cisternas de una especie de bromelia en la Reserva Ecológica “La Martinica” en Banderilla, Veracruz. Las recolecciones se estudiaron en material preservado y en cultivos. Se obtuvieron cerca de 60 algas pertenecientes a las Cyanoprokariota, Euglenophyta, Cryptophyta, Chlorophyta y Bacillariophyta, sin embargo, solo se lograron identificar 16 especies. Se concluye que los tanques de Tillandsia multicaulis brindan las condiciones adecuadas para el desarrollo de microalgas y que la ubicación y la morfología de la bromelia influyen en la distribución de este grupo biológico. La escasez de individuos en las muestras analizadas no permitió una identificación precisa de todas las especies. En los cultivos aparecieron especies no observadas en el material preservado, lo que indica una flora mucho más rica de la que puede observarse directamente.

  9. Uso local y potencial de las especies arbóreas en camarón de Tejeda, Veracruz

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    E. Couttolenc-Brenis

    2005-01-01

    Full Text Available Los sistemas agroforestales son una alternativa para mejorar los sistemas agrícolas y pecuarios. Se requiere identificar las especies arbóreas con potencial para ser incorporadas en los sistemas de producción agropecuarios. En Camarón de Tejeda, Veracruz, la crisis de la agricultura basada en el cultivo de la caña y la poca rentabilidad de la actividad ganadera, obliga a buscar opciones de producción diversificadas y de bajo impacto ambiental. En este trabajo se elaboró un catálogo de especies arbóreas nativas presentes en las áreas productivas y en la vegetación natural con el fin de identificar los usos que la gente de la región les asigna. Se realizaron recorridos en la zona con el fin de inventariar las especies, colectarlas para su identificación y obtener información sobre los usos locales. Se realizó una consulta bibliográfica para documentar los usos potenciales de las especies inventariadas. Se generó un listado de 38 especies, de las cuales a 21 de ellas se reporta al menos un uso local. Los resultados reflejan el alto potencial de especies arbóreas útiles en el área para ser incorporadas a los sistemas de producción agroforestal.

  10. TYPOLOGY OF FAMILY PRODUCTION UNITS OF TRADICIONAL AGROFORESTY SYSTEM OF COFFEE-BANANA-CITRUS IN THE COUNTRY TLAPACOYAN, VERACRUZ

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    R. Cruz A.

    2015-12-01

    Full Text Available Coffee production is one of the most important activities in the town of Tlapacoyan, Veracruz unfortunately, prices and technologies focused on the monoculture production system have reduced the activity. The study of family production units (FPU, with the construction of a typology and an agronomic characterization of producers, carried out in the traditional agroforestry system of coffee-banana-citrus contributes to further analysis in public policies. This study was conducted in six communities through field work, coffee producers records and open interviews with authorities. A census of 33 individuals was built and questionnaires were applied as a part of the survey, which used multivariate analysis to establish categories of UPF. Each category was described in agronomic terms based on incomes and costs. Three categories were determined according to surface size, labor work and technological level, including diversification of costs of incomes. As a conclusion, this study has contributed to rethink about new supporting strategies for coffee producers, and government policies and supporting programs which will mean a better family income that will take into account differences such as the size varying from 5 to 27 ha. Labor work available varies among categories and technification defines the type and number of vehicles, because it refers to an activity that generates beneficial incomes to producers. We conclude that this heads of the UPF have traditional management of the 3 components, integrating productive practical and the system is dependent on labor.

  11. Macroflora and macrofauna associated with sumerged roots of Rhizophora mangle (Rhizophoraceae, in the Tampamachoco lagoon, Veracruz, Mexico

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    Edith Lucas M

    2018-03-01

    Full Text Available In the Tampamachoco lagoon, Veracruz, the diversity, abundance and similarity of the floristic and faunistic composition associated to R. mangle roots were determined; four sampling sites were distributed in the northern, central and southern portions of the lagoon, and 10 mangrove roots were searched for each site for collection, identification and quantification of the organisms. With the quantitative information, species richness, Simpson dominance, fairness and true diversity were estimated, and similarities/dissimilarities were determined between the sampling areas by sorting and ordering analysis. Ten species of algae, 26 invertebrate species and one vertebrate species were identified, totaling 37 species. A total of 10260 macrofaunal organisms were quantified, with an average abundance of 85.5 ± 71.2 ind/root being estimated. The most abundant species were Amphibalanus sp., Ischadium recurvum and Crassostrea rhizophorae. The remarkable abundance in the northern zone was significantly different from the central and southern zones. In general, the macrofaunistic community was equitable, and presented true diversity values from 2.8 to 3.7 effective species. The composition and abundance of macrofauna were similar in the three sampling zones. The submerged roots of R. mangle play a key role in the Tampamachoco lagoon by providing habitats for various aquatic organisms.

  12. Near-coastal ocean variability off southern Tamaulipas - northern Veracruz, western Gulf of Mexico, during spring-summer 2013

    Science.gov (United States)

    Rivas, David

    2016-04-01

    Six months of observations from a near-coastal mooring deployed off southern Tamaulipas-northern Veracruz coast (western Gulf of Mexico) during spring-summer 2013 provides velocity, temperature, salinity, sea level, and dissolved oxygen series in a region which ocean dynamics is still poorly understood. As shown in a preceding analysis of this region's winter circulation for winter 2012-2013, coastal trapped motions associated with the regional invasion of synoptic cold fronts modulate the local variability; this pattern remains in the spring 2013, when even more intense events of alongshore flow (>50 cm/s) are observed. This intensified flow is associated with a significant decrease in the dissolved oxygen, most probably related to an influence of hypoxic waters coming from the northern Gulf. In late spring-mid summer, the wind pattern corresponds to persistent southeasterly winds that favor the occurrence of a local upwelling, which maintains a local thermal reduction (>3 degrees Celsius) and is associated with a persistent northward flow (>30 cm/s). The late summer was characterized by a significant tropical-cyclone activity, when a depression, a storm, and a hurricane affected the western Gulf. These tropical systems caused an intense precipitation and hence an important intensification of the local riverine discharge, and the winds enhanced the mixing of such riverine waters, via mostly kinetic stirring and Ekman pumping.

  13. Analysis and Tendencies of Metals and POPs in a Sediment Core from the Alvarado Lagoon System (ALS), Veracruz, Mexico.

    Science.gov (United States)

    Botello, A V; Villanueva, F S; Rivera, R F; Velandia, A L; de la Lanza, G E

    2018-03-06

    This study focused on dating of a sediment core from the Alvarado Lagoon System, Veracruz, Mexico, calculating the sedimentation rate by using 210 Pb to determine the tendency towards pollution by polycyclic aromatic hydrocarbons, organochlorides, the metals Cd, Cr, Cu, Hg, Ni, Pb, and V, and organic matter content. The activity of total Pb and supported Pb in the samples was 83.1 and 29.5 Bq kg -1 , respectively, whereas the average estimated sedimentation rate was 0.48 ± 0.09 cm per year -1 . The organic matter values exhibited linear behavior throughout the historical profile, with values under 2.5%. Metal concentrations followed the order V > Cr > Ni > Cu > Pb > Hg > Cd. Variations found in Cr, Ni, Pb, and V concentrations are basically due to three meteorological phenomena that hit the region: hurricanes Gladys, Hilda, and Janet in September of 1955. V, Ni, and Hg input comes from anthropogenic and lithogenic sources. The presence of individual polycyclic aromatic hydrocarbons showed no ascending accumulation pattern over time, nor did it show any significant statistical correlation to OM. As for the organochlorine pesticides, 63.61% of the total sum of these compounds were from the ciclodienics family. Concentration of p,p'-DDT was observed only in the earliest profile, from 1929.

  14. Prevalencia de anticuerpos contra Trypanosoma cruzi en donadores de sangre del IMSS, Orizaba, Veracruz, México

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    Ramos-Ligonio Angel

    2006-01-01

    Full Text Available OBJETIVO: Determinar la prevalencia de anticuerpos contra Trypanosoma cruzi en donadores del Hospital General Regional del Instituto Mexicano del Seguro Social (IMSS en la ciudad de Orizaba, Veracruz. MATERIAL Y MÉTODOS: Se examinaron muestras de donadores del banco de sangre del Hospital General Regional (HGRO del IMSS para la búsqueda de antiT. cruzi por ELISA, Western blot e IFI, utilizando una proteína recombinante (MBP::Hsp70 y un extracto crudo de epimastigotes. Las muestras fueron obtenidas entre los meses de octubre de 2001 a enero de 2002. RESULTADOS: Los 420 donadores de sangre analizados fueron seronegativos para HBV, HCV, BrA, VDRL y HIV. Después del tamizaje de los 420 donadores, se identificaron dos individuos seropositivos por las pruebas de ELISA, Western blot e IFI, con una seroprevalencia de 0.48%. CONCLUSIONES: En este estudio se muestran evidencias de seropositividad para T. cruzi en donadores de sangre del HGRO, lo que sugiere la existencia de riesgo de contaminación por transfusión sanguínea. Por tal motivo, es necesario aplicar programas para el tamizaje serológico a través de técnicas inmunológicas con alta sensibilidad y especificidad.

  15. Assessment of land use and land cover change in Tecolutla River Basin, Veracruz, Mexico; during the period 1994-2010

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    Ana Karen Osuna-Osuna

    2015-04-01

    Full Text Available Studies related to changes in vegetation and land use cover have gained importance in environmental research, as they allow for the assessment of time-space trends in deforestation and environmental degradation processes, especially as caused by human activity. In this context, the main goal of this study was to evaluate the impact of human activity in the basin of the Tecolutla River, in Veracruz, Mexico during a 16-year period. Landsat satellite images were used for the years 1994 and 2010, distinguishing nine land use coverage classes: rainforest, forest, agricultural land, water, disturbed vegetation, urban settlements, grasslands, citrus crops and shrubs. Thematic maps were validated, yielding overall accuracies greater than 92% and Kappa coefficients of 0.89 and 0.91 for the 1994 and 2010 classifications, respectively. Analysis of the transition matrix revealed a trend of increasing areas related to human activity (agriculture and urban use showing percentage changes of 28% and 67% within 16 years, respectively. Consequently, a decrease (-1.1% per year in areas with natural cover, specifically forest and jungle, was observed. Similar findings were reported in works done at national and state levels, where the transition of natural cover by the increasing of anthropogenic activities has been proven. The results of this study are useful for future environmental development planning, land management planning and planning strategies for the conservation of the natural resources in the basin.

  16. Cambio tecnológico en los agroecosistemas por migración familiar: el caso del municipio de Jamapa, Veracruz / Technological change in agroecosystems due to family migrations: The case of the Jamapa municipality, Veracruz

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    Verónica Rosales-Martínez

    2014-01-01

    Full Text Available La migración es una estrategia de supervivencia aplicada en contextos de pobreza, para aliviar la problemática de salarios bajos y necesidades familiares atendidas ineficientemente. El objetivo fue realizar una comparación del manejo tecnológico de las actividades agropecuarias que realizaron las familias antes y después de migrar en el municipio de Jamapa, Veracruz, desde el año 1979 hasta 2008. Se realizó una encuesta a 45 familias con migrantes, utilizando un cuestionario con 115 preguntas cerradas, durante el año 2009. Se observaron cambios estadísticamente significativos (McNemar, Chi2 = 18.91 y p < 0.001 con connotación negativa en el total de la tecnología usada para las actividades de maíz, frijol y ganadería bovina. La definición de cambio negativo se fundamentó en que los elementos tecnológicos que utilizaban los productores antes de migrar y que después de migrar no utilizaron, fueron 265; el grupo de elementos tecnológicos con cambio positivo que antes no usaban y después sí utilizaron fue de 173 elementos. Puede concluirse que el flujo migratorio ha influido negativamente en los cultivos de maíz (Chi2= 122.49, p < 0.001 y frijol (Chi2 = 98.09, p < 0.001, pero positivamente en la actividad de ganadería (Chi2 = 116.48, p < 0.001. De esa manera, la economía de las familias con migrantes en los agroecosistemas de Jamapa mejoró, pero se redujo la diversidad de actividades agropecuarias. Palabras clave: Migrantes, tecnología, maíz, frijol, ganadería. ABSTRACT Migration is a survival strategy that is applied in situations of poverty, to lighten the problem of low salaries and inefficiently managed family needs. The purpose of this study was to compare the technological management of farming activities, applied by families before and after migrating, from 1979 to 2008 in the municipality of Jamapa, Veracruz. A survey was applied to 45 families with migrants, with a questionnaire of 115 closed questions, during the

  17. Contexto y Caracterización de la Cadena de Suministro del Limón Persa (Citrus latifolia Tanaka) en Veracruz-México

    OpenAIRE

    Gregorio Fernández-Lambert; Alberto Antonio Aguilar-Lasserre; Gustavo Martínez-Castellanos; María Leocelia Guadalupe Ruvalcaba-Sánchez; Juan Gabriel Correa-Medina; José Luis Martínez-Flores

    2015-01-01

    Esta investigación se realiza en el Distrito Citrícola de Martínez de la Torre, Ver., con alcance a los municipios de Álamo Temapache, y Cuitláhuac en Veracruz, y reporta el contexto e integración de la cadena de suministro del limón persa. El estudio de sus eslabones permitió identificar las problemáticas de abastecimiento, operación y distribución en dicha cadena. A partir de entrevistas abiertas no estructuradas a especialistas, técnicos, productores y empresarios, así como la consult...

  18. Factores que influyen en la práctica de la horticultura periurbana: caso de una ciudad en el estado de Veracruz, México

    OpenAIRE

    Marco Antonio Toral Juárez; Catalino Jorge López Collado; Felipe Gallardo López

    2016-01-01

    El objetivo del trabajo fue identificar factores culturales, socioeconómicos y ambientales que influyen en la disposición de las madres de familia a practicar la horticultura en el hogar y conocer la rentabilidad de la producción de hortalizas en contenedores. Con un muestreo no probabilístico se seleccionaron 114 madres de familia en el área peri-urbana de Cardel, Veracruz, México. Posteriormente, fueron entrevistadas mediante una encuesta tipo escala Likert para obtener la disposición a pra...

  19. La variabilidad de la lluvia al sur del paralelo 20º norte en el estado de Veracruz

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    Ramón Sierra Morales

    1969-06-01

    Full Text Available La finalidad primordial del estudio fué elegir las fórmulas mas adecuadas para determinar de una manera efectiva la variabilidad de la lluvia en nuestro país, a fin de preparar la programación primero, de la variabilidad de la lluvia en el estado de Veracruz y posteriormente en toda la República. Esta variación que se define como la diferencia con la media calculada en un período considerable de años de observación, es significativa debido a que tiene una relación directa, con las explotaciones agrícolas, con la vegetación y suelos, así como con la distribución de ios núcleos de población y la localización de zonas industriales y de almacenamiento de agua para diversos usos. En este trabajo se tomaron como base 19 estaciones meteorológicas distribuidas en la parte meridional del Estado de Veracruz, evitando que quedaran muy aglomeradas, ya que por tratarse de un trabajo experimental no era necesario emplearlas todas. Una vez reunidos los datos de precipitación anual de un período mayor de 12 años se procedió a calcular la variación interanual de la lluvia cuantificando y calculando la desviación que acusan los valores individuales respecto al promedio aritmético. Con el propósito de tener una idea de cómo la variabilidad afecta el desarrollo de la agricultura, se hizo un análisis de este tipo de actividad tomando como base datos estadísticos de producción de los siguientes cultivos: maíz, frijol, caña de azúcar y café, por tratarse de productos con un rendimiento y consumo muy elevados. Se concluyó que, en general, el rendimiento de los cultivos ofrece una tendencia a disminuir a medida que el coeficiente de variación aumenta; sin embargo hay algunas estaciones en que esto no sucede, lo cual pone de manifiesto que las características agrícolas de un lugar no sólo dependen de la variabilidad, sino de otros factores como son la topografía del terreno, el tipo de clima, las prácticas agrícolas empleadas

  20. Posición comercial regional de los maíces mejorados generados por el INIFAP en Veracruz

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    Ana Lid del Angel-Pérez

    2016-01-01

    Full Text Available Introducción. El maíz es un cereal básico en la alimentación mexicana y el más cultivado por los agricultores. Sin embargo, la demanda de maíz para consumo y de semilla mejorada (SM, ha ocasionado fuertes importaciones, pues en 2012, se importaron 9´515,000 t. Gran parte de la demanda de SM es cubierta por empresas transnacionales, y en menor medida por pequeñas empresas privadas y organismos gubernamentales como el Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias (INIFAP. El objetivo del trabajo fue conocer el mercado regional de SM en el estado de Veracruz, la posición comercial del INIFAP y las variables relevantes que motiva la decisión de compra. Método. En 2015 se aplicó un cuestionario a 100 productores de maíz para grano, en ocho municipios del estado de Veracruz, mediante el muestreo Respondent-Driven Sampling (RDS. El instrumento consideró preguntas abiertas y cerradas de opción múltiple, para obtener información socioeconómica y perceptual sobre el conocimiento y uso de semillas mejoradas (SM de origen INIFAP o las que acostumbran sembrar. Resultados y discusión. El 75% del mercado regional de SM, las cubre el INIFAP. El mercado lo constituyen productores en pequeña escala (3.4 ha en promedio. La motivación de siembra depende de la Recomendación de amigos o familiares (p<0.0001. El uso de SM de origen INIFAP, está asociado a las variables socioeconómicas: Cercanía del lugar de compra (0.9451** y Conoce las semillas INIFAP (0.9199**, así como con el hecho de que los productores Siembran SM (0.4320** y Prefiere sembrar SM (0.3844** cuyos coeficientes de correlación son bajos pero fortalecidos por la significancia. Las variables de opinión que favorecen el uso de SM fueron: Tiene ventajas sobre los maíces criollos (0.6162** y Planta con buena arquitectura (0.3938**. Las características perceptuales importantes para el productor al consumir el grano fueron Sabor, Nixtamalizaci

  1. Time trend tendency (1988-2014 years) of organochlorine pesticide levels in the adipose tissue of Veracruz inhabitants.

    Science.gov (United States)

    Calderón-Garcidueñas, Ana Laura; Waliszewski, Stefan M; Ruiz-Ramos, Rubén; Del Carmen Martinez-Valenzuela, María

    2018-03-10

    The population that lives in areas where organochlorine pesticides were spread in the past is still exposed to them through contaminated food, particulate matter, and vapors. Due to their lipophilic properties and resistance to metabolic reactions, they accumulate in tissues and fluids rich in lipids. The aim of the study was to monitor the concentrations of organochlorine pesticides in forensic adipose tissue samples of adult inhabitants of Veracruz City, Mexico, and compare their time trend levels from 1988 to 2014. During the study, hexachlorobenzene (HCB); lindane; β-hexachorocyclohexane; p,p'-dichlorodiphenyldichloroethylene (pp'DDE); p,p'-dichlorodiphenyldichloroethane (p,p'-DDT); and o,p'-dichlorodiphenyldichloroethane (o,p'-DDT) were determined. Our survey was divided into two periods: first, from the years 1988 to 1999, during which DDT was allowed to fight malaria and dengue vectors and the second from the years 2001 to 2014, after the DDT ban. A total of 1435 samples were analyzed. There were substantial differences in the forecasted time trend values of p,p'-DDE and p,p'-DDT in human adipose tissue samples in the two different periods. During the first period, p,p'-DDE decrease time trend was 1.198 mg/kg on lipid base per year; for the second one, decrease was 0.128 mg/kg on lipid base per year. p,p'-DDT decreased 0.507 mg/kg on lipid base during the first period and 0.039 mg/kg on lipid base for the second. The different concentrations may be explained by the cessation of fresh exposure after the first period and a more equilibrated decontamination tendency during the second period. This model was useful to show the decrease in the concentration of pesticides in human adipose tissue samples.

  2. CARACTERIZACIÓN AGROFORESTAL EN SISTEMAS DE CAFÉ TRADICIONAL Y RÚSTICO, EN SAN MIGUEL, VERACRUZ, MÉXICO

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    Luis Villavicencio-Enríquez

    2013-01-01

    Full Text Available Se realizaron caracterizaciones agroforestales en cafetales de tipo tradicional y rústico en la comunidad de San Miguel, Amatlán de los Reyes, Veracruz, México, con el objetivo de analizarlos y compararlos entre sí. Los resultados indican que ambos sistemas obtienen beneficios económicos similares aunque la composición de especies del dosel y los productos obtenidos son distintos. El principal producto económico son los árboles maderables (Cedrela odorata, Robinsonella mirandae y Mastichodendron capirii, seguido del café (Coffea arabica y C. canephora y las palmas Chamaedorae tepejilote y Chamaedorae elegans. La relación beneficio/costo obtenida para la venta de los productos forestales y agrícolas indica una mayor ganancia económica para el sistema rústico de café ($ 20,784.00·año-1·ha-1 respecto al sistema tradicional de café ($ 19,236.00·año-1·ha-1. Aunque las ganancias en ambos sistemas son relativamente buenas, el efecto que este tipo de explotación tiene sobre los recursos forestales puede ser poco sustentable a través del tiempo, ya que en el sistema rústico no existen labores de reforestación. El sistema tradicional de café se encuentra en una mejor condición de sustentabilidad y producción a largo plazo, ya que los elementos utilizados para la comercialización de árboles maderables y para combustible son reforestados por la importancia comercial que éstos tienen.

  3. Pública utilidad o causa pública: la utilidad de los conventos de la provincia de Veracruz, 1786-1834

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    Carbajal López, David

    2008-12-01

    Full Text Available Between 1786 and 1834 the convents of Veracruz were justified with the argument of the “public utility”, that one of the neighborhood of a town, for which they used to provide the sacraments and they contributed to the maintenance of the order and the local honor. After the independence new arguments appear: the welfare and the education. At the end of eigteenth century they were also considered beneficial to the State, because they preached the obedience to the king. But then and above all after the independence, they began to be considered useless or even dangerous for the “public cause”. However, the attempt of secularization of 1834 shows us that the culture of the traditional “public utility” maintained its currency.

    Entre 1786 y 1834 los conventos veracruzanos se justificaban a partir de la “pública utilidad”, la del vecindario de una población, al cual aportaban los sacramentos, colaboraban en el mantenimiento del orden y del honor local. Tras la independencia, aparecen como nuevos argumentos la beneficencia y la educación. A finales del siglo XVIII eran considerados además benéficos al Estado, pues predicaban la obediencia al rey; mas ya entonces y sobre todo tras la independencia, comenzaron a ser considerados inútiles o incluso peligrosos para la “causa pública”. Empero, el intento de exclaustración de 1834 muestra que la cultura de la “pública utilidad” tradicional mantenía su vigencia.

  4. Complex landslides in the Trans-Mexican Volcanic Belt - a case study in the State of Veracruz

    Science.gov (United States)

    Wilde, M.; Terhorst, B.; Schwindt, D.; Rodriguez Elizarrarás, S. R.; Morales Barrera, W. V.; Bücker, M.; Flores Orozco, A.; García García, E.; Pita de la Paz, C.

    2017-12-01

    The State of Veracruz (Mexico) is a region which is highly affected by landslides, therefore detailed studies on triggering factors and process dynamics of landslides are required. Profound insights are essential for further hazard assessments and compilation of susceptibility maps. Exemplary landslide sites were investigated in order to determine characteristic features of specific regions. In the Chiconquiaco Mountain Range numerous damaging landslide events occurred in the year of 2013 and our case study corresponds to a deep-seated landslide originating from this slide-intensive year. The main scientific aspects are placed on the reconstruction of the landslides geometry and its process dynamics. Therefore, surface and subsurface analysis form the base of a multimethodological approach. In order to perform surface analysis, aerial photographs were collected by an unmanned aerial vehicle (UAV) aiming at the generation of a 3D model with the Structure from Motion (SfM) work routine. Ground control points (GCP) were used to ensure the geometric accuracy of the model. The obtained DEM of the 2013 slide mass as well as an elevation model representing the topographic situation before the event (year 2011) were used to detect surface changes. The data enabled determination of the most affected areas as well as areas characterized by secondary movements. Furthermore, the volume of the slide mass could be calculated. Geophysical methods, as electrical resistivity tomography (ERT) as well as seismic refraction tomography (SRT), were applied for subsurface analysis. Differences in subsurface composition, respectively density, allowed for separation of the slide mass and the underlying unit. Most relevant for our studies is the detection of an earlier landslide leading to the assumption that the 2013 landslide event corresponds to a reactivation process. This multimethodological approach enables a far-reaching visualization of complex landslides and strongly supports the

  5. Diversity and communities of foliar endophytic fungi from different agroecosystems of Coffea arabica L. in two regions of Veracruz, Mexico.

    Science.gov (United States)

    Saucedo-García, Aurora; Anaya, Ana Luisa; Espinosa-García, Francisco J; González, María C

    2014-01-01

    Over the past 20 years, the biodiversity associated with shaded coffee plantations and the role of diverse agroforestry types in biodiversity conservation and environmental services have been topics of debate. Endophytic fungi, which are microorganisms that inhabit plant tissues in an asymptomatic manner, form a part of the biodiversity associated with coffee plants. Studies on the endophytic fungi communities of cultivable host plants have shown variability among farming regions; however, the variability in fungal endophytic communities of coffee plants among different coffee agroforestry systems is still poorly understood. As such, we analyzed the diversity and communities of foliar endophytic fungi inhabiting Coffea arabica plants growing in the rustic plantations and simple polycultures of two regions in the center of Veracruz, Mexico. The endophytic fungi isolates were identified by their morphological traits, and the majority of identified species correspond to species of fungi previously reported as endophytes of coffee leaves. We analyzed and compared the colonization rates, diversity, and communities of endophytes found in the different agroforestry systems and in the different regions. Although the endophytic diversity was not fully recovered, we found differences in the abundance and diversity of endophytes among the coffee regions and differences in richness between the two different agroforestry systems of each region. No consistent pattern of community similarity was found between the coffee agroforestry systems, but we found that rustic plantations shared the highest number of morphospecies. The results suggest that endophyte abundance, richness, diversity, and communities may be influenced predominantly by coffee region, and to a lesser extent, by the agroforestry system. Our results contribute to the knowledge of the relationships between agroforestry systems and biodiversity conservation and provide information regarding some endophytic fungi and

  6. Seasonal morphological variability in an in situ Cyanobacteria monoculture: example from a persistent Cylindrospermopsis bloom in Lake Catemaco, Veracruz, Mexico

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    Owen Lind

    2016-03-01

    Full Text Available The phrase cyanobacteria bloom implies a transient condition in which one to few species dominates communities. In this paper we describe a condition in which the bloom is of multi-year duration consisting of different morphologies of a single cyanobacteria species. Lake Catemaco, Veracruz, México maintained a year-round massive (108 trichomes L-1 population of potentially toxin-producing cyanobacteria, Cylindrospermopsis spp. The trichomes are present as straight and coiled morphotypes.  The relative trichome morphology abundance varied with rainy (June – October and dry seasons (November – May, but total trichome abundance did not vary.  Coiled trichomes and heterocytes (occurring only on coiled trichomes were significantly more abundant, both absolutely and relatively, during the dry season. Both coiled trichome and heterocyte mean volumes were significantly smaller during the rainy season than during the dry season.  Biovolumes were largest in January when water temperature was 5º C cooler suggesting buoyancy as a morphology-determining factor. However, with a more than three-fold lower TIN concentration during the dry season, we hypothesized that the coiled morphotype became abundant primarily because it formed heterocytes, which the straight morphotype did not. Spatial trichome and heterocyte abundance differences were small among the 15 lake sites (average CV for all dates = 20%. However, there was a pattern of increased heterocyte and coiled trichome abundance from lake inflow, as a nitrogen source, to outflow during the rainy season. The total volume of heterocytes per litre of lake water increased progressively four-fold from a minimum early in the rainy season to a maximum at the end of the dry season. Morphological diversity, as seen in Lake Catemaco, can partially compensate for the lack of species diversity in determination of community structure.

  7. Fragmentation effect in the leaf morphometry and environment of Quercus germana Schldl. & Cham. (Fagaceae in Xalapa, Veracruz

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    Anantli Martínez-Munguía

    2015-01-01

    Full Text Available Quercus germana es una especie endémica del bosque mesófilo de montaña de México. La presión de selección que la fragmentación y los cambios ambientales ejercen, sugieren diferenciación fenotípica. Por lo anterior, la relación de la diferenciación foliar de Q. germana con la fragmentación y las condiciones ambientales se evaluó en seis sitios del bosque mesófilo de Xalapa, Veracruz. Para ello, se colectaron 10 hojas de las ramas nones de 30 individuos por sitio; se midieron 10 características morfométricas foliares y siete ambientales. Los análisis de varianza se realizaron con el modelo linear generalizado; se utilizó un análisis discriminante, se construyeron árboles de ligamiento UPGMA y se proyectaron las poblaciones tridimensionalmente. Las distancias de Mahalanobis se compararon con una prueba de Mantel para estimar la relación morfométrica y ambiental. Las variables morfológicas que mejor separan los sitios son mucrones, nervaduras y tamaño del peciolo. Ambientalmente, las variables más discriminantes son luz, temperatura y pérdida de humedad. La prueba de Mantel no mostró relación entre las diferencias morfométricas y ambientales (r = 0.090, P = 0.306. Las subpoblaciones de Q. germana son morfológicamente diferentes a pesar de la distancia corta que las separa, lo cual indica que posiblemente son afectadas por la fragmentación aún sin influencia ambiental.

  8. Validación de genotipos de frijol negro en la zona central del Estado de Veracruz, México

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    Francisco Javier Ugalde Acosta

    2005-01-01

    Full Text Available Validación de genotipos de frijol negro en la zona central del estado de Veracruz, México. El objetivo del presentetrabajo, fue validar genotipos de frijol con el paquete tecnológico del INIFAP, en parcelas de productores. Durante los ciclosde humedad residual de 1998 a 2001 se establecieron nueveparcelas de validación. Los genotipos utilizados fueron: las lí-neas II-307 y DOR-500 y las variedades Negro Huasteco 81,Negro Cotaxtla 91 y Negro INIFAPy como testigo del productor la variedad Jamapa. En las parcelas se realizaron las laboresde manejo agronómico recomendadas por el INIFAPpara esazona de producción. Cada parcela ocupó una superficie total de3000 m2. Se realizaron análisis de varianza individuales por localidad, considerando como repetición los rendimientos obtenidos por cada genotipo (500 m2 por ciclo de evaluación; también se efectuaron análisis combinado con prueba deseparación de medias (DMS 5% y un análisis económico mediante la Tasa de Retorno Marginal. Los resultados indicaronque las variedades y líneas mejoradas fueron superiores en másdel 100% en rendimiento al testigo. El análisis económicomostró que el mayor beneficio económico se obtuvo al sembrarlas variedades Negro INIFAPy Negro Cotaxtla 91, con utilidades superiores a los US $ 286/ha y una relación beneficio/costo de 1,52 y 1,51, respectivamente.

  9. A multi-tracer approach to delineate groundwater dynamics in the Rio Actopan Basin, Veracruz State, Mexico

    Science.gov (United States)

    Pérez Quezadas, Juan; Heilweil, Victor M.; Cortés Silva, Alejandra; Araguas, Luis; Salas Ortega, María del Rocío

    2016-12-01

    Geochemistry and environmental tracers were used to understand groundwater resources, recharge processes, and potential sources of contamination in the Rio Actopan Basin, Veracruz State, Mexico. Total dissolved solids are lower in wells and springs located in the basin uplands compared with those closer to the coast, likely associated with rock/water interaction. Geochemical results also indicate some saltwater intrusion near the coast and increased nitrate near urban centers. Stable isotopes show that precipitation is the source of recharge to the groundwater system. Interestingly, some high-elevation springs are more isotopically enriched than average annual precipitation at higher elevations, indicating preferential recharge during the drier but cooler winter months when evapotranspiration is reduced. In contrast, groundwater below 1,200 m elevation is more isotopically depleted than average precipitation, indicating recharge occurring at much higher elevation than the sampling site. Relatively cool recharge temperatures, derived from noble gas measurements at four sites (11-20 °C), also suggest higher elevation recharge. Environmental tracers indicate that groundwater residence time in the basin ranges from 12,000 years to modern. While this large range shows varying groundwater flowpaths and travel times, ages using different tracer methods (14C, 3H/3He, CFCs) were generally consistent. Comparing multiple tracers such as CFC-12 with CFC-113 indicates piston-flow to some discharge points, yet binary mixing of young and older groundwater at other points. In summary, groundwater within the Rio Actopan Basin watershed is relatively young (Holocene) and the majority of recharge occurs in the basin uplands and moves towards the coast.

  10. RELACIONES GENÉTICAS DEL AGUACATE (Persea americana Mill. EN SIETE MUNICIPIOS DEL CENTRO DE VERACRUZ, CARACTERIZADAS CON MICROSATÉLITES

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    María Elena Galindo-Tovar

    2011-11-01

    Full Text Available México es el primer productor y consumidor de aguacate a nivel mundial. Las condiciones ecotopográficas de la zona Centro del estado de Veracruz y la distribución natural del género Persea, convierten el área en un gran acervo genético del aguacate. Debido a que esta especie presenta un alto grado de hibridación, la evaluación de las relaciones genéticas permite distinguir diferentes taxa e identificar material promisorio para programas de mejoramiento. El objetivo fue analizar las relaciones genéticas de Persea americana en la zona Centro del estado de Veracruz, mediante microsatélites. Se analizaron muestras foliares de 44 árboles ubicados en siete localidades; se realizó extracción de ADN y su amplificación utilizando iniciadores para microsatélites. Los datos se analizaron con el programa PopGene 3.2. Todas las localidades resultaron polimórficas, y aunque mostraron baja diferenciación genética, en el dendrograma se observaron dos grupos definidos por características de altitud, clima y suelo.

  11. Proposal of Organizational Innovation for The Creation of Sme’s Products Exotic in A Community Indigenous Totonaca in Papantla, Veracruz, Mexico

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    Dra. Bertha Alicia Arce Castro

    2013-07-01

    Full Text Available In this work we’re given the results obtained after a year of improvement and application of a new model called Model of organizational change for the creation of small and medium-sized companies in non-traditional products, into a Totonaca a community in Veracruz, Mexico. Thisproposal has been designed to answer the under treatment of technical literature about rural family business, satisfying the lack of General models, which doesn’t respond to identified needs in farming communities with similar characteristics, generating companies to promote change in the Mexican food industry, able to meet the requirements of the current socio-economic context. The project has a strong element of innovation, which should gradually relates knowledge of farmers and that combined with them, generate knowledge management, which will become in organizational knowledge of the new company. In the selected region is intended to replicate the good results obtained in the implementation of the model in the region of Coatepec Veracruz, where 13 peasant families dedicated to beekeeping formed an innovative company that is involved in local, national and international markets.

  12. [Concentration of Hg, Pb, Cd, Cr and As in liver Carcharhinus limbatus (Carcharhiniformes: Carcharhinidae) captured in Veracruz, Mexico].

    Science.gov (United States)

    Mendoza-Díaz, Fernando; Serrano, Arturo; Cuervo-López, Liliana; López-Jiménez, Alejandra; Galindo, José A; Basañez-Muñoz, Agustin

    2013-06-01

    Pollution by heavy metals in marine ecosystems in the Gulf of Mexico is one of the hardest conservation issues to solve. Sharks as top predators are bioindicators of the marine ecosystem health, since they tend to bioaccumulate and biomagnify contaminants; they also represent a food source for local consumption. Thus, the objective of this study was to study the possible presence of heavy metals and a metalloid in livers of Carcharhinus limbatus. For this, a total of 19 shark livers were taken from animals captured nearby Tamihua, Veracruz, Mexico from December 2007 to April 2008. 12 out of the 19 captured sharks were males, one was an adult female, three were juvenile males, and three juvenile females. Four heavy metals (Hg, Pb, Cd, and Cr) and one metaloid (As) were analyzed in shark livers using an atomic absorption spectrophotometry with flame and hydride generator. Our results showed that the maximum concentrations found were: Hg = 0.69 mg/kg, Cd = 0.43 mg/kg, As = 27.37 mg/kg, Cr = 0.70 mg/kg. The minimum concentrations found were: As = 14.91 mg/kg, Cr = 0.35 mg/kg. The Pb could not be determined because the samples did not have the spectrophotometer minimum detectable amount (0.1 mg/kg). None of the 19 samples analyzed showed above the permissible limits established by Mexican and American laws. There was a correlation between shark size and Cr and As concentration (Pearson test). The concentration of Cr and As was observed to be higher in bigger animals. There was not a significant difference in heavy metals concentration between juveniles and adults; however, there was a difference between males and females. A higher Cr concentration was found in females when compared to males. None of the samples exceed the maximum limit established by the laws of Mexico and the United States of America. Much longer studies are needed with C. limbatus and other species caught in the region, in order to determine the degree of contaminants exposure in aquatic ecosystems

  13. Some implications of time series analysis for describing climatologic conditions and for forecasting. An illustrative case: Veracruz, Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Gay, C.; Estrada, F.; Conde, C. [Centro de Ciencias de la Atmosfera, Universidad Nacional Autonoma de Mexico, Mexico, D.F. (Mexico)]. E:mail: feporrua@atmosfera.unam.mx

    2007-04-15

    The common practice of using 30-year sub-samples of climatological data for describing past, present and future conditions has been widely applied, in many cases without considering the properties of the time series analyzed. This paper shows that this practice can lead to an inefficient use of the information contained in the data and to an inaccurate characterization of present, and especially future, climatological conditions because parameters are time and sub-sample size dependent. Furthermore, this approach can lead to the detection of spurious changes in distribution parameters. The time series analysis of observed monthly temperature in Veracruz, Mexico, is used to illustrate the fact that these techniques permit to make a better description of the mean and variability of the series, which in turn allows (depending on the class of process) to restrain uncertainty of forecasts, and therefore provides a better estimation of present and future risk of observing values outside a given coping range. Results presented in this paper show that, although a significant trend is found in the temperatures, giving possible evidence of observed climate change in the region, there is no evidence to support changes in the variability of the series and therefore there is neither observed evidence to support that monthly temperature variability will increase (or decrease) in the future. That is, if climate change is already occurring, it has manifested itself as a change-in-the-mean of these processes and has not affected other moments of their distributions (homogeneous non-stationary processes). The Magicc-Scengen, a software useful for constructing climate change scenarios, uses 20-year sub-samples to estimate future climate variability. For comparison purposes, possible future probability density functions are constructed following two different approaches: one, using solely the Magicc-Scengen output, and another one using a combination of this information and the time

  14. Propuesta de un plan de desarrollo integral del guanábano (Annona muricata L. en el estado de Veracruz México

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    Librado Vidal Hernández

    2014-01-01

    Full Text Available El estado de Veracruz tiene una superficie de 71' 227 km². Cuenta con una zona potencialmente apta para el cultivo del guanábano de 18' 440 ha, (0.21%, una zona medianamente propicia de 3' 645 324 ha (51.30% y una zona no apropiada de 3' 458 862 ha, (48.44%. Existen 20 municipios productores de guanábano en el estado de Veracruz. Actualmente la demanda por este producto ha permitido su incremento en superficie estimándose en 800 ha, en estos últimos años. Con un rendimiento aproximado de 5.0 ton/ha, por debajo de la media nacional que es de 6.5 ton/ha, esto refleja la poco tecnología empleada en el manejo del cultivo. Lamentablemente el desarrollo de este frutal en Veracruz se ha realizado de una manera desordenada. Todo ello, sin ninguna planeación y sin un estudio sobre un ordenamiento agroecológico a fin de detectar áreas potencialmente aptas para este cultivo. A pesar de toda esta complejidad se ha llegado a considerar como un frutal digno de atención por las posibilidades agroindustriales que representa. En general son tres los principales puntos prioritarios a tomar en cuenta para esta estrategia de desarrollo: Primero las características genéticas del material de propagación. Segundo las condiciones de sanidad de las plantas, principal factor que podría ser limitativo para el desarrollo del guanábano. Tercero la tecnología de producción. Existe desconocimiento en la lámina e intervalo riego, época; dosis y fuente de fertilización; época y tipo de poda. Existe una gran fortaleza en su aprovechamiento integral de este frutal: comercial, industrial, medicinal, farmacéutico, fitotóxico, alimenticio, entre otras propiedades.

  15. Descripción del cráneo de Bramocharax caballeroi Contreras & Rivera 1985 (Pisces, Characidae), pez endémico del Lago de Catemaco, Veracruz, México Description of the skull of Bramocharax caballeroi Contreras & Rivera 1985 (Pisces, Characidae), endemic fish to Catemaco Lake, Veracruz, Mexico

    OpenAIRE

    Martha Elena Valdez-Moreno; Salvador Contreras-Balderas

    2009-01-01

    El género Bramocharax se distribuye del centro-norte de Centro América a México. Hasta este momento se conoce a Bramocharax bransfordi de Nicaragua y Costa Rica, a B. dorioni y B. baileyi de Guatemala y a B. caballeroi del lago de Catemaco, Veracruz, México. El trabajo tuvo por objetivo estudiar detalladamente el cráneo de Bramocharax caballeroi a partir del análisis de 37 topotipos de diferentes tallas y compararlo con otras especies relacionadas. B. caballeroi presenta 58 huesos en su cráne...

  16. Analytical methods for wind persistence: Their application in assessing the best site for a wind farm in the State of Veracruz, Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Cancino-Solorzano, Yoreley; Gutierrez-Trashorras, Antonio J.; Xiberta-Bernat, Jorge [Departamento de Energia, Escuela Tecnica Superior de Ingenieros de Minas, Universidad de Oviedo., c/ Independencia, 13, 2a Planta, 33004 Oviedo (Spain)

    2010-12-15

    The properties of wind persistence are an essential parameter in carrying out a complete analysis of possible sites for a wind farm. This parameter can be defined as a measure of the mean duration of wind speed within a given interval of values for a concrete site. In this study the persistence properties are evaluated from the methods based on the autocorrelation function, conditional probability and the curves of speed duration, used satisfactorily by other authors. The statistical analysis of the series of useful persistence is also carried out to validate the results obtained. These methods have been applied to hourly data of wind speed corresponding to five Weather Stations (WS) in the State of Veracruz, Mexico in the period 1995-2006. The results obtained indicate that the coastal areas have the best properties of wind speed persistence and are, therefore, the most indicated for the generation of electricity from this renewable energy source. (author)

  17. Proteocephalus brooksi n. sp. (Cestoda:Proteocephalidae) in the neotropical freshwater fish Rhamdia guatemalensis (Siluriformes: Pimelodidae) from Lake Catemaco, Veracruz, Mexico.

    Science.gov (United States)

    García-Prieto, L; Rodríguez, L M; Pérez-Ponce de León, G

    1996-12-01

    Proteocephalus brooksi n. sp. is described from the neotropical pimelodid fish Rhamdia guatemalensis from Lake Catemaco, Veracruz, México. The new species is characterized by the "paramuscular" position of vitellaria, the cortical origin of uterine stem with development of medullar lateral branches, the alternated position of vagina (anteriorly and posteriorly to cirrus sac), and the absence of apical organ and vaginal sphincter. Proteocephalus brooksi most closely resembles Nomimoscolex matogrossensis from which it differs in a series of characters. The probable paraphyletic nature of both Proteocephalus and Nomimoscolex and the convergent evolution of the "paramuscular" location of vitellaria among proteocephalideans are suggested, and the need for a phylogenetic analysis of the group is emphasized. The new species is assigned to Proteocephalus pending such an analysis.

  18. Caracterización y clasificación de suelos con fines productivos en Córdoba, Veracruz, México

    Directory of Open Access Journals (Sweden)

    Francisco Bautista Zúñiga

    1998-01-01

    Full Text Available The epipedons of soils for sugarcane cultivation from Córdoba, Veracruz, Mexico, were analyzed, ordered and classified using multivariate statistical procedures. Soils were also classified according to FAO nomenclature. Two groups of soils and their diagnostic properties were found. Wtih lineal regressions we selected the diagnostic soif properties that are easy to analyze, as: pH, clay percent, real density, and water rain (in mm. The drawing to soil maps at large scale with these soil properties would be an easy, less expensive and useful way to identify the areas susceptible for the application of waste on soil, also for amendments for sugarcane crops, for example, phosphate fixation, Ai toxicity, water retention, redox conditions, among others ones. The mayor soil groups are: acrisol, lixisol, fluvisol and cambisol. Acrisol and lixisol are reported for the first time for this geographical region.

  19. Efectividad biológica delazoxystrobin para el control de pyricularia oryzae cav. y cercospora oryzae miyake. en arroz de temporal en Veracruz, México

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    Enrique Becerra

    2001-01-01

    Full Text Available El estado de Veracruz, México, siembra anualmente 22000 ha de arroz de temporal con un rendimiento medio de 3,5 t/ha, debido principalmente a problemas de sequía lo cual favorece la presencia de hongos como Pyricularia oryzae Cav. (quema del arroz y Cercospora oryzae Miyake. (Mancha angosta. Con el objeto de conocer el comportamiento de nuevos fungicidas se evaluó la eficacia del Azoxystrobin en el control de estos hongos. El experimento se estableció en el municipio de Tres Valles, Veracruz, durante el temporal de 1999, con semilla de Milagro Filipino Depurado. El diseño estadístico utilizado fue bloques al azar con cuatro repeticiones. Los tratamientos evaluados fueron: Azoxystrobin a 0,2, 0,4 y 0,6 l/ha vs Tecto60 a 0,5 kg/ha y un testigo sin aplicación. Estos fueron aplicados al presentarse los primeros síntomas de las enfermedades. Se evaluó la incidencia, número de lesiones en 20 plantas, índice de intensidad, el rendimiento de grano y fitotoxicidad. Se encontró que el Azoxystrobin obtuvo mejores resultados que el Tecto 60 y éste a su vez que el testigo no tratado. El mejor control para P. oryzae y C. oryzae y el mayor rendimiento de grano (4432 kg/ha se logró cuando se aplicó Azoxystrobin en dosis de 0,6 l/ha, aunque con 0,2 y 0,4 l/ha de este fungicida tuvo un buen control de estas enfermedades. Ninguno de los fungicidas causó toxicidad al arroz

  20. ¿Cómo gestionar un destino turístico emergente y vivir para contarlo? Construcción de una estrategia competitiva a partir de la complejidad territorial de una ciudad capital: el caso de Tuxtla Gutiérrez

    Directory of Open Access Journals (Sweden)

    Jorge Humberto Trujillo

    2008-11-01

    Full Text Available Ante un incremento de la competencia debido a la aparición de más destinos emergentes en México, una ciudad capital en proceso de metropolización como Tuxtla Gutiérrez, se prepara para iniciar un proceso de desarrollo turístico complejo a partir de la consideración de aspectos territoriales (físicos, sociales y económicos entendidos como producto social, a manera de características esenciales que le diferencian y le puede posicionar como competitivo en función de la capacidad de sus agentes sociales para favorecer y facilitar experiencias turísticas satisfactorias. En este sentido, el presente informe es el resultado preliminar de un ejercicio dialéctico que ha combinado estudios de posgrado en alta gestión de destinos turísticos y la experiencia de dirigir la oficina de turismo durante 18 meses.

  1. Nematofauna asociada a la rizosfera de papas (Solanum tuberosum cultivadas en la zona productora del Cofre de Perote, Veracruz, México Nematode fauna associated with the rhizosphere of potato crop (Solanum tuberosum grown in the region of Cofre de Perote, Veracruz, Mexico

    Directory of Open Access Journals (Sweden)

    Damaris Desgarennes

    2009-12-01

    Full Text Available Se determinaron y clasificaron en grupos tróficos las especies de nematodos asociados a la rizosfera de Solanum tuberosum en suelos altamente infectados por el nematodo dorado de la papa (Globodera rostochiensis en un ciclo de cultivo, en la zona productora del Cofre de Perote, Veracruz, México. Se identificaron 7 géneros (Aphelenchoides, Aphelenchus, Crassolabium, Mesodorylaimus, Plectus y Steinernema y 8 especies (Aporcelaimellus obtusicaudatus, Ecumenicus monohystera, Acrobeles mariannae, Acrobeles singulus, Acrobeloides nanus, Cruznema tripartitum, Eucephalobus oxyuroides, y Globodera rostochiensis en asociación con la rizosfera de papas cultivadas. Crassolabium sp. y E. monohystera se registran por primera vez para México.Nematode species associated with the rhizosphere of Solanum tuberosum were identified and classified into trophic groups from soils highly infected by the golden potato cyst nematode (Globodera rostochiensis in a single crop cycle in the producing zone on the Cofre de Perote, Veracruz, Mexico. Seven genera (Aphelenchoides, Aphelenchus, Crassolabium, Mesodorylaimus, Plectus and Steinernema and 8 species (Aporcelaimellus obtusicaudatus, Ecumenicus monohystera, Acrobeles mariannae, Acrobeles singulus, Acrobeloides nanus, Cruznema tripartitum, Eucephalobus oxyuroides, and Globodera rostochiensis were found in association with the rhizosphere of cultivated potatoes. Crassolabium sp. and E. monohystera are recorded for the first time in México.

  2. Concentración de Hg, Pb, Cd, Cr y As en hígado de Carcharhinus limbatus (Carcharhiniformes: Carcharhinidae capturado en Veracruz, México

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    Fernando Mendoza-Díaz

    2013-06-01

    Full Text Available La contaminación de los ecosistemas marinos y costeros por metales pesados en el Golfo de México es uno de los problemas que afectan a los recursos naturales del medio acuático. Los tiburones por situarse en niveles tróficos superiores de la red alimenticia acumulan y magnifican cantidades considerables de contaminantes. Por esta razón, el objetivo de este trabajo fue determinar la concentración de cuatro metales pesados (Hg, Cd, Pb y Cr y un metaloide (As en el tiburón punta negra (Carcharhinus limbatus por medio de espectrofotometría de absorción atómica con flama y generador de hidruros. Se muestrearon 19 hígados de tiburones capturados cerca de Tamiahua, Veracruz entre noviembre 2007 y marzo 2008, de los cuales 12 fueron machos adultos, una hembra adulta, tres machos jóvenes y tres hembras jóvenes. Las concentraciones máximas registradas para cada metal fueron: Hg=0.69mg/ kg, Cd=0.43mg/kg, As=27.37mg/kg, Cr=0.35mg/kg. El Pb no fue detectado, no al menos la cantidad mínima de detección requerida por el espectrofotómetro de absorción atómica (0.1mg/kg. Ninguna de las muestras analizadas rebasó los límites máximos permisibles por las leyes mexicanas y americanas.Concentration of Hg, Pb, Cd, Cr and As in liver Carcharhinus limbatus (Carcharhiniformes: Carcharhinidae captured in Veracruz, Mexico. Pollution by heavy metals in marine ecosystems in the Gulf of Mexico is one of the hardest conservation issues to solve. Sharks as top predators are bioindicators of the marine ecosystem health, since they tend to bioaccumulate and biomagnify contaminants; they also represent a food source for local consumption. Thus, the objective of this study was to study the possible presence of heavy metals and a metalloid in livers of Carcharhinus limbatus. For this, a total of 19 shark livers were taken from animals captured nearby Tamihua, Veracruz, Mexico from December 2007 to April 2008. 12 out of the 19 captured sharks were males, one was

  3. Prevalencia de Leptospirosis y su relación con la tasa de gestación en bovinos de la zona centro de Veracruz

    Directory of Open Access Journals (Sweden)

    Juan Prisciliano Zárate Martínez

    2015-01-01

    Full Text Available Introducción: La reproducción bovina es afectada por varias enfermedades infecciosas, entre las que se encuentran leptospirosis, brucelosis, campilobacteriosis, diarrea viral bovina y rinotraqueitis infecciosas bovina. Estas enfermedades infecciosas causan pérdidas económicas a la industria ganadera. El objetivo fue determinar la seroprevalencia de cinco especies de Leptospira: hardjo, inifap, paloalto, tarassovi y wolffi en siete unidades de producción (UP del estado de Veracruz, así como las razones de momios entre las seroprevalencias de las UP. Un objetivo adicional fue determinar si la presencia de Leptospira influye la tasa de gestación (TG. Método: Las UP fueron de los municipios de San Rafael, Medellín y Cotaxtla. Se tomaron muestras de sangre de vacas Bos taurus x Bos indicus. Los análisis serológicos para determinar la presencia de Leptospiras se realizaron con la prueba de microaglutinación en placa. Se consideraron como positivos los animales con títulos mayores que 1:100. Los análisis de seroprevalencia se realizaron con el procedimiento GENMOD de SAS, considerando un diseño completamente al azar, donde el factor de riesgo fue la UP, y asumiendo la función liga logit para una distribución binomial. El análisis de TG se realizó con el mismo procedimiento, asumiendo la misma función liga, pero el modelo incluyó los efectos de estatus zoosanitario (presencia/ausencia de Leptospiras y UP. Resultados: La variable UP fue significativa (P0.05 para la de L. inifap y L. wolffi. Las seroprevalencias promedio fueron: 89.3, 67.1, 40.0, 15.9 y 10.0% para L. inifap, L. hardjo, L. paloalto, L. tarassovi y L. wolffi, respectivamente. El estatus zoosanitario y UP no afectaron (P>0.05 la TG. La TG promedio de las siete UP fue 50.5% Discusión o Conclusión: Los resultados obtenidos en el presente trabajo muestran que las cinco especies de Leptospira estudiadas se encuentran presentes en todas las unidades de producci

  4. COMPARACIÓN DE LOS COMPONENTES DEL RENDIMIENTO EN VARIEDADES DE FRIJOL EN CONDICIONES DE ACIDEZ Y HUMEDAD RESIDUAL DEL SUELO EN EL SUR DE VERACRUZ

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    Aurelio Morales Rivera

    2015-10-01

    Full Text Available El frijol negro (Phaseolus vulgaris L. se cultiva en suelos ácidos (pH<5 con humedad residual en el sur del estado de Veracruz, México. El cultivo se realiza en unas 6600 ha al final de la temporada de lluvias a mediados de septiembre o principios de octubre. La humedad residual, aunado a la acidez del suelo frecuentemente afectan el periodo de formación de la semilla, reduciendo el rendimiento. El presente trabajo tuvo como objetivo caracterizar variedades de frijol de tipo III en cuanto a su rendimiento de semilla y sus componentes, cultivadas bajo restricciones de humedad residual y acidez del suelo, y altas temperaturas en el ciclo otoño-invierno 2012-2013, en el Municipio de Juan Rodríguez Clara, Veracruz. Se emplearon seis variedades de testa de color negro, seis del tipo ‘Flor de Mayo’ y una del tipo ‘Flor de Junio’. El diseño experimental fue de bloques completos al azar con cuatro repeticiones. La unidad experimental se constituyó de cinco surcos de 5 m de longitud y 0.8 m de separación. Se fertilizó con una dosis de 40-40-00. Las variedades “Negro Veracruz”, “San Andrés”, “Negro Cotaxtla” y “Flor de Junio Marcela”, exhibieron mayor rendimiento de semilla, vainas por m2 y peso de 200 semillas, altura de planta y menor biomasa aérea final que las demás. El mayor rango de variabilidad genética entre las variedades se observó para la biomasa aérea final y altura de planta. La respuesta en rendimiento y sus componentes sugiere que algunas variedades de testa negra han desarrollado mecanismos de tolerancia a la acidez, restricción de humedad residual del suelo y altas temperaturas durante la floración y formación de la semilla, que les permiten producir altos rendimientos a pesar de estar sometidas a estrés ambiental. La variedad de Valles Altos (“Flor de Junio Marcela”, también mostró que podría tener buena adaptación a estas condiciones.

  5. Archaeological and Geological dating by means of thermoluminescence; Fechamiento geologico y arqueologico por termoluminiscencia

    Energy Technology Data Exchange (ETDEWEB)

    Gonzalez M, P R

    1999-07-01

    In this thesis an specific method for dating local archaeological and geological samples based on the phenomenon of thermoluminescence (TL) using the fine grain and quartz inclusion techniques is developed. Taking into account that this work is interesting for professionals working in the fields of Physics, Chemistry, Archaeology, Anthropology and related sciences, some basic concepts are described to have a better comprehension. Chapter 1 describes the concept of radioactivity, remarking the importance of the different decay types as well as the main radioactive series and the energy liberated in the process. The causes of radioactive desequilibrium are also considered in the case for radon. Another important aspect taken into account in this chapter is the radioisotope production and its relationship with the neutron activation analysis used for the determination of the Uranium and Thorium concentrations in the samples. The TL phenomenon is described in Chapter 2, emphasizing the importance of the process of thermally stimulated luminescence best known as TL and its application for dating minerals of different origin. Chapter 3 shows some important antecedents remarking some aspects of the techniques commonly used for dating purposes. Chapter 4 shows the different methods used for the sample preparation. The techniques used for the {sup 40} K, {sup 238} U and {sup 232} Th determination as well as for the cosmic radiation measurement using locally made TLD are also described. The methods used for the determination of the paleodosis as a function of the TL intensity of each sample are described: special emphasis is taken on the moisture effects as well as in the error limits in the age estimation. Results and conclusions of this study are presented in Chapter 5. These results gave an age of 980 {+-} 90 years for the Edzna ceramic and 1520 {+-} 90 years for the Calixtlahuaca ceramics. The age of the Teotihuacan ceramics was not estimated due to the lack of a stable region of the traps. In the case of paleodunes from the Sonora desert the age estimated was 3810 {+-} 110 years. The results ofthis study are shown as they were obtained from the reader. In conclusion, it can be said, looking at the results of this study, that the TL dating method is a promising method compared with the other techniques traditionally used for dating. This method could be used in the future to date samples from other archaeological sites in which its inhabitants did not leave any ''written''testimony of their presence. On the other hand, the dating of the paleodunes offers the possibility to study the geological phenomena provoked by the climatic changes in the past. The results showed here are the first obtained in Mexico in this field. (Author)

  6. Archaeological and Geological dating by means of thermoluminescence; Fechamiento geologico y arqueologico por termoluminiscencia

    Energy Technology Data Exchange (ETDEWEB)

    Gonzalez M, P.R

    1999-07-01

    In this thesis an specific method for dating local archaeological and geological samples based on the phenomenon of thermoluminescence (TL) using the fine grain and quartz inclusion techniques is developed. Taking into account that this work is interesting for professionals working in the fields of Physics, Chemistry, Archaeology, Anthropology and related sciences, some basic concepts are described to have a better comprehension. Chapter 1 describes the concept of radioactivity, remarking the importance of the different decay types as well as the main radioactive series and the energy liberated in the process. The causes of radioactive desequilibrium are also considered in the case for radon. Another important aspect taken into account in this chapter is the radioisotope production and its relationship with the neutron activation analysis used for the determination of the Uranium and Thorium concentrations in the samples. The TL phenomenon is described in Chapter 2, emphasizing the importance of the process of thermally stimulated luminescence best known as TL and its application for dating minerals of different origin. Chapter 3 shows some important antecedents remarking some aspects of the techniques commonly used for dating purposes. Chapter 4 shows the different methods used for the sample preparation. The techniques used for the {sup 40} K, {sup 238} U and {sup 232} Th determination as well as for the cosmic radiation measurement using locally made TLD are also described. The methods used for the determination of the paleodosis as a function of the TL intensity of each sample are described: special emphasis is taken on the moisture effects as well as in the error limits in the age estimation. Results and conclusions of this study are presented in Chapter 5. These results gave an age of 980 {+-} 90 years for the Edzna ceramic and 1520 {+-} 90 years for the Calixtlahuaca ceramics. The age of the Teotihuacan ceramics was not estimated due to the lack of a stable region of the traps. In the case of paleodunes from the Sonora desert the age estimated was 3810 {+-} 110 years. The results ofthis study are shown as they were obtained from the reader. In conclusion, it can be said, looking at the results of this study, that the TL dating method is a promising method compared with the other techniques traditionally used for dating. This method could be used in the future to date samples from other archaeological sites in which its inhabitants did not leave any ''written''testimony of their presence. On the other hand, the dating of the paleodunes offers the possibility to study the geological phenomena provoked by the climatic changes in the past. The results showed here are the first obtained in Mexico in this field. (Author)

  7. Seroprevalencia de anticuerpos contra Trypanosoma cruzi y su asociación con factores de riesgo en menores de 18 años de Veracruz, México Seroprevalence of Trypanosoma cruzi antibodies and associated risk factors among the population under 18 years of age in Veracruz, Mexico

    Directory of Open Access Journals (Sweden)

    Paz María Salazar

    2007-08-01

    Full Text Available OBJETIVOS: Determinar la prevalencia de anticuerpos contra Trypanosoma cruzi en menores de 18 años del estado de Veracruz, México, e identificar los factores de riesgo asociados con las características de la vivienda y la presencia y distribución del agente transmisor. MÉTODOS: Estudio epidemiológico transversal en la población menor de 18 años que vivía en 10 de las 11 jurisdicciones sanitarias del estado de Veracruz, México, entre 2000 y 2001. La presencia de anticuerpos contra T. cruzi se determinó mediante una prueba de hemaglutinación indirecta (HAI y un ensayo inmunoenzimático indirecto tipo ELISA en muestras de suero tomadas en papel de filtro y se confirmaron mediante las pruebas de HAI, ELISA e inmunofluorescencia indirecta (IFI en muestras de suero. Se aplicó un cuestionario para evaluar las condiciones de la vivienda y se calcularon los índices entomológicos de triatominos intra y peridomiciliarios. Los resultados se evaluaron mediante análisis bifactorial y multifactorial por regresión logística no condicional. RESULTADOS: De las 150 personas inicialmente reactivas, 14 resultaron positivas (5 mediante la prueba de HAI, ELISA e IFI; 6 por HAI y ELISA y 3 por ELISA e IFI, para una prevalencia general de 0,91% (IC95%: 0,85% a 0,94%. Los casos positivos residían en cinco jurisdicciones sanitarias y la mayor prevalencia se encontró en Tuxpan: 5,2% (IC95%: 1,2% a 9,0%. Los factores de riesgo fueron el haber visto chinches dentro de la vivienda y los techos con fisuras. La única especie del agente transmisor capturada fue Triatoma dimidiata. Los índices entomológicos de infestación, colonización e infección natural fueron: 10,9%, 50,0% y 9,0%, respectivamente. CONCLUSIONES: Se confirmó la transmisión vectorial activa de la infección en el estado de Veracruz, México, con una seroprevalencia general de anticuerpos contra T. cruzi en menores de 18 años de 0,91%. Se debe seguir atentamente la seroprevalencia en

  8. EVALUACIÓN DE CAL, SULFATO E HIDROXICLORURO DE ALUMINIO EN LA COAGULACION-FLOCULACION DEL LIXIVIADO DEL RELLENO SANITARIO DE POZA RICA, VERACRUZ

    Directory of Open Access Journals (Sweden)

    Israel Hernández

    2013-01-01

    Full Text Available En el presente artículo se reporta el proceso de clarificación del lixiviado de un basurero de la Ciudad de Poza Rica de Hidalgo, Veracruz, con este fin se utilizó como coagulantes óxido de calcio, sulfato e hidroxicloruro de aluminio. El CaO no presentó capacidad floculante para el lixiviado tratado bajo ninguna de las condiciones ensayadas. El Al2(SO43 mostró buena actividad floculante al tratar el lixiviado obteniéndose 0.97 NTU en el índice de turbidez con 2250 ppm del sulfato de aluminio, por la elevada cantidad de floculante el proceso caro; por otra parte, la floculación de los sólidos suspendidos en el lixiviado se logró una mayor extensión empleando 1.5 ppm de Al2(OH5Cl2*5H2O obteniendo un índice de turbidez de 0.83 NTU, con pH de 7.63.

  9. ESTRUCTURA POBLACIONAL DE Abies religiosa (Kunth Schltdl. et Cham., EN EL EJIDO EL CONEJO DEL PARQUE NACIONAL COFRE DE PEROTE, VERACRUZ, MÉXICO

    Directory of Open Access Journals (Sweden)

    María del Rosario Pineda-López

    2013-01-01

    Full Text Available Se estudió la estructura de los rodales de oyamel (Abies religiosa presentes en el ejido El Conejo, localizado en el Parque Nacional Cofre de Perote, Veracruz. Se evaluó la densidad, diámetro, altura y cobertura del arbolado adulto en 17 parcelas de 625 m2. La regeneración se midió en las 17 parcelas utilizando subcuadrantes de 312.50 m2. El arbolado mostró una estructura de crecimiento de “J” invertida; sin embargo, los individuos se encuentran suprimidos y, aun cuando la regeneración es adecuada, el arbolado requiere de la apertura de claros para su desarrollo. Se encontró una superficie arbolada altamente fragmentada y amenazada de manera permanente por el crecimiento de la frontera agrícola y la extracción de leña para uso doméstico. Los resultados muestran evidencia de que la categoría de parque nacional no contribuye a la conservación del bosque.

  10. "Anciennes folies neptuniennes!" Über das wiedergefundene "Journal du Mexique à Veracruz" aus den mexikanischen Reisetagebüchern A. v. Humboldts

    Directory of Open Access Journals (Sweden)

    Ulrike Leitner

    2002-10-01

    Full Text Available Article in German, Abstracts in English and German.When Humboldt in 1853 reread his 1804 notebook of his travel from Mexico City to Veracruz, he criticized his “old Neptunistic follies” in a marginal note. Scholars have doubted that he was still a Neptunist in 1804, but this text and Humboldt’s later remark prove it.Curiously, these few pages were omitted from his South American notebooks when they were rebound in 9 volumes at the end of his life. Together with the Berlin State Library autograph collection, these missing pages were relocated during World War II, and for decades they were considered lost. Actually, they are well preserved in the Krakau University Library, where I found them recently. They form a valuable addition to Margot Faak’s edition of Humboldt’s Latin American diaries.This paper discusses the manuscript, showing the development of Humboldt’s opinions in some disciplines he was concerned with. Some of these developments represent paradigmatic changes in natural history, especially in geology.

  11. Influence of water temperature and salinity on seasonal occurrences of Vibrio cholerae and enteric bacteria in oyster-producing areas of Veracruz, México.

    Science.gov (United States)

    Castañeda Chávez, Maria del Refugio; Pardio Sedas, Violeta; Orrantia Borunda, Erasmo; Lango Reynoso, Fabiola

    2005-12-01

    The influence of temperature and salinity on the occurrence of Vibrio cholerae, Escherichia coli and Salmonella spp. associated with water and oyster samples was investigated in two lagoons on the Atlantic Coast of Veracruz, Mexico over a 1-year period. The results indicated that seasonal salinity variability and warm temperatures, as well as nutrient influx, may influence the occurrence of V. cholera. non-O1 and O1. The conditions found in the Alvarado (31.12 degrees C, 6.27 per thousand, pH=8.74) and La Mancha lagoons (31.38 degrees C, 24.18 per thousand, pH=9.15) during the rainy season 2002 favored the occurrence of V. cholera O1 Inaba enterotoxin positive traced in oysters. Vibrio alginolyticus was detected in Alvarado lagoon water samples during the winter season. E. coli and Salmonella spp. were isolated from water samples from the La Mancha (90-96.7% and 86.7-96.7%) and Alvarado (88.6-97.1% and 88.6-100%) lagoons. Occurrence of bacteria may be due to effluents from urban, agricultural and industrial areas.

  12. Relación entre la heterogeneidad del paisaje y la riqueza de especies de flora en cuencas costeras del estado de Veracruz, México

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    Ángel Priego Santander

    2012-02-01

    Full Text Available La heterogeneidad del paisaje varía en el espacio dependiendo de la proporción entre polígonos y unidades tipológicas. La alta variabilidad del espacio geográfico le confiere una elevada connotación ecológica, lo cual sugiere una estrecha relación con la distribución de la biodiversidad. El objetivo de este estudio es conocer si se puede predecir la riqueza de especies a través de indicadores de variabilidad espacial. Para esclarecer esto, se exploró la relación entre heterogeneidad del paisaje y la riqueza de flora, en tres cuencas costeras del estado de Veracruz. La riqueza, dominancia, abundancia y diversidad de los paisajes resultaron variables explicativas de la riqueza de especies. Los modelos obtenidos explican más de 75% de la relación. Estos resultados indican que la riqueza de especies de flora puede ser pronosticada por valores de heterogeneidad del paisaje. Se sugiere explorar la probable existencia de zonas de elevada biodiversidad en áreas de difícil acceso o poco conocidas, con el uso de sensores remotos.

  13. Calidad del agua de la niebla captada artificialmente en la microcuenca del río Pixquiac, Veracruz, México: resultados preliminares

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    Rodolfo Jofre-Meléndez

    2015-01-01

    Full Text Available Con el fin de determinar si el agua recolectada artificialmente de la niebla en la zona central montañosa del Estado de Veracruz es apta para el consumo humano, se realizó un muestreo preliminar de enero a marzo del año 2010, periodo de mayor frecuencia de nieblas, para analizar sus aspectos físicos, químicos y biológicos y evaluar su calidad. Se encontró que el agua contiene metales pesados como el mercurio, organismos coliformes y cantidades altas de nitrógeno amoniacal, pero esto se puede solucionar aplicando un tratamiento de saneamiento para uso humano con un costo de 0.00341 USD L -1 que no incluye mano de obra ni infraestructura. Se discuten las causas que pueden originar su contaminación y se concluye que el agua recolectada de la niebla no es adecuada para el consumo humano, pero sí para la agricultura.

  14. Interactions between payments for hydrologic services, landowner decisions, and ecohydrological consequences: synergies and disconnection in the cloud forest zone of central Veracruz, Mexico

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    Heidi Asbjornsen

    2017-06-01

    hydrologic services and people's decisions, behavior, and knowledge regarding forest conservation and water. Using central Veracruz as our case study, we identify areas of both synchrony and disconnection between PHS goals and outcomes. Mature and regenerating cloud forests (targeted by PHS were found to produce enhanced hydrologic services relative to areas converted to pasture, including reduced peak flows during large rain events and maintenance of dry-season base flows. However, unexpectedly, these hydrologic benefits from cloud forests were not necessarily greater than those from other vegetation types. Consequently, the location of forests in strategic watershed positions (e.g., where deforestation risk or hydrologic recharge are high may be more critical than forest type in promoting hydrologic functions within watersheds and should be considered when targeting PHS payments. While our results suggest that participation in PHS improved the level of knowledge among watershed inhabitants about forest-water relationships, a mismatch existed between payment amounts and landowner opportunity costs, which may contribute to the modest success in targeting priority areas within watersheds. Combined, these findings underscore the complexity of factors that influence motivations for PHS participation and land use decisions and behavior, and the importance of integrating understanding of both ecohydrological and socioeconomic dynamics into PHS design and implementation. We conclude by identifying opportunities for improving the design of PHS programs and recommending priority areas for future research and monitoring, both in Mexico and globally.

  15. El padrón del impuesto personal y la migración en Córdoba, Veracruz: 1906-1907

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    Soledad García Morales

    1998-01-01

    Full Text Available El impuesto personal fue una de las contribuciones que desde la República Restaurada cobró importancia en Veracruz como medida para incrementar el ramo de finanzas. Sin embargo, fue durante el porfiriato cuando logró rendir sus mejores frutos, a través de la participación de los jefes políticos, quienes junto con los alcaldes municipales se encargaron de la elaboración de los padrones y del cobro de dicho impuesto. Son precisamente esos padrones los que se convierten en una fuente de consulta para quienes se interesan en acercarse al estudio de las migraciones internas, ya que entre sus rubros contienen información sobre la procedencia, ocupación , salario y destino de los jornaleros. En el caso de Córdoba nos limitamos a estudiar los años 1906 y 1907, considerados de crisis económica donde, sin embargo, persistió una afluencia de inmigrantes con destino a las haciendas cafetaleras de la zona.

  16. Factores que influyen en la práctica de la horticultura periurbana: caso de una ciudad en el estado de Veracruz, México

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    Marco Antonio Toral Juárez

    2016-01-01

    Full Text Available El objetivo del trabajo fue identificar factores culturales, socioeconómicos y ambientales que influyen en la disposición de las madres de familia a practicar la horticultura en el hogar y conocer la rentabilidad de la producción de hortalizas en contenedores. Con un muestreo no probabilístico se seleccionaron 114 madres de familia en el área peri-urbana de Cardel, Veracruz, México. Posteriormente, fueron entrevistadas mediante una encuesta tipo escala Likert para obtener la disposición a practicar la horticultura periurbana (DAPH y las familias se clasificaron en cuatro niveles socioeconómicos. La rentabilidad de la producción hortícola fue estimada por el método Relación Beneficio/Costo. El resultado de la DAPH es favorable y cuatro de seis contenedores son rentables. Múltiples factores influyen en la DAPH y el factor ambiental determina los tipos de hortalizas a cultivar.

  17. Screening program for cervical cancer: public policies and experiences of actors who implement the program in the state of Veracruz, Mexico

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    Zuanilda Mendoza

    2017-10-01

    Full Text Available El propósito fue analizar cómo se desarrolla el Programa de Detección del Cáncer Cervicouterino en una clínica de displasias y algunos centros de salud en el estado de Veracruz, a través de las representaciones y prácticas de los actores sociales que implementan el programa. Para ello, se realizaron entrevistas en profundidad y observación de la práctica de estos prestadores de servicios durante varios periodos a lo largo de 3 años entre 2009 y 2011. A partir de la información obtenida pretendemos dar cuenta de las dificultades, aciertos y resultados que dicho programa tiene como parte de una política pública, sobre la base de que las políticas en salud tienen como prioridad que toda la población se vea beneficiada por los servicios de atención preventiva y curativa, y si bien la evidencia nos muestra que las poblaciones marginadas no se ven beneficiadas por dichos programas, pareciera que esta información no permea los saberes populares y médicos.

  18. Estrategias competitivas para los productores cafetaleros de la región de Córdoba, Veracruz, frente al mercado mundial

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    Joaquín Perea Quezada

    2008-01-01

    Full Text Available Este trabajo tiene como objetivo identifi car las estrategias competitivas para los productores cafetaleros de la región de Córdoba, Veracruz. Esto les permitirá competir en un mercado mundial globalizado, el cual se caracteriza por la sobreproducción de café en países como Brasil, Vietnam y Colombia, la fuerte competencia en el mercado de materias primas, el control del grano por un número limitado de países torrefactores y el descenso sostenido de los precios del café oro en el mercado mundial. Estas condiciones complicaron la atención de los cultivos para algunos productores y el abandono total de sus plantaciones para otros, como resultado del descenso de los precios internacionales. El descuido de la producción nacional y la pérdida de espacios han sido aprovechados por los países que vieron la crisis como una oportunidad para extender sus mercados sobre sus competidores más débiles.

  19. El panorama epidémico en el Golfo de México. Los puertos de La Habana, Veracruz y New Orleans en la segunda mitad del siglo XIX

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    José Ronzón León

    1998-01-01

    Full Text Available El artículo tiene como tema el estudio de la epidemia de fiebre amarilla, en 1905, en los puertos de Veracruz, La Habana y New Orleans. El objetivo de este artículo es analizar la epidemia de fiebre amarilla que se convirtió en una pandemia que afectó dichos puertos. La finalidad es comprender la presencia de esta enfermedad en estos puertos y los efectos que tuvo en las relaciones políticas y comerciales de la región, mismos que condujeron a la búsqueda de políticas sanitarias y de saneamiento urbano.

  20. Disputas Y Adaptaciones En Torno Al Uso De Los Recursos En La Reserva De La Biosfera “Los Tuxtlas”, Veracruz (México

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    Emilia Velázquez Hernández

    2015-12-01

    Full Text Available Resumen: Entre 1982 y el año 2000 el Estado mexicano estableció un importante dispositivo institucional que incluyó la elaboración de leyes y la creación de dependencias gubernamentales con la finalidad de proteger el medio ambiente y fomentar el desarrollo local y regional. El Estado adquirió así un papel relevante en el establecimiento de una nueva gobernanza con relación al uso de los recursos naturales, pero ¿cuál ha sido el papel que las poblaciones locales han jugado en la construcción de la actual gobernanza ambiental?, ¿y cuáles han sido los mecanismos utilizados para impugnar o aprovechar la normatividad ambiental estatal? Este artículo busca responder a estas preguntas a partir de tres estudios de caso realizados en un área natural protegida al sur de México, con la intención de develar cómo en la práctica se adoptan, reformulan, o evaden las políticas de conservación.  Palabras clave: recursos naturales, áreas naturales protegidas, normatividad estatal, respuestas locales.  *** Abstract: Between 1982 and 2000 the mexican state created an important legal and administrative structure for the environmental protection as well as the local and regional development. In this way, the state acquired a relevant rol in the creation of a new governance related to the use and management of natural resources, but ¿which has been the rol that local people has played in the construction of this governance ?, and ¿what mecahisms the people has used for contest or take advantage of the institutions and laws related wiht the environmental matter. This article examines these questions in relation to three case studies carried out in The Biosphere Reserve « Los Tuxtlas », in the souht of Mexico. Key Words: natural resources, protected natural areas, state environmental regulations, local answers. *** Resumo: Entre 1982 e o ano de 2000 o Estado mexicano estabeleceu um importante dispositivo institucional que incluiu a

  1. Specific genetic markers for detecting subtypes of dengue virus serotype-2 in isolates from the states of Oaxaca and Veracruz, Mexico

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    Camacho-Nuez Minerva

    2008-07-01

    Full Text Available Abstract Background Dengue (DEN is an infectious disease caused by the DEN virus (DENV, which belongs to the Flavivirus genus in the family Flaviviridae. It has a (+ sense RNA genome and is mainly transmitted to humans by the vector mosquito Aedes aegypti. Dengue fever (DF and dengue hemorrhagic fever (DHF are caused by one of four closely related virus serotypes (DENV-1, DENV-2, DENV-3 and DENV-4. Epidemiological and evolutionary studies have indicated that host and viral factors are involved in determining disease outcome and have proved the importance of viral genotype in causing severe epidemics. Host immune status and mosquito vectorial capacity are also important influences on the severity of infection. Therefore, an understanding of the relationship between virus variants with altered amino acids and high pathogenicity will provide more information on the molecular epidemiology of DEN. Accordingly, knowledge of the DENV serotypes and genotypes circulating in the latest DEN outbreaks around the world, including Mexico, will contribute to understanding DEN infections. Results 1. We obtained 88 isolates of DENV, 27 from Oaxaca and 61 from Veracruz. 2. Of these 88 isolates, 16 were serotype 1; 62 serotype 2; 7 serotype 3; and 2 serotype 4. One isolate had 2 serotypes (DENV-2 and -1. 3. Partial nucleotide sequences of the genes encoding C- prM (14 sequences, the NS3 helicase domain (7 sequences, the NS5 S-adenosyl methionine transferase domain (7 sequences and the RNA-dependent RNA polymerase (RdRp domain (18 sequences were obtained. Phylogenetic analysis showed that DENV-2 isolates belonged to the Asian/American genotype. In addition, the Asian/American genotype was divided into two clusters, one containing the isolates from 2001 and the other the isolates from 2005–2006 with high bootstrap support of 94%. Conclusion DENV-2 was the predominant serotype in the DF and DHF outbreak from 2005 to 2006 in Oaxaca State as well as in the 2006

  2. Composición química de la fauna de acompañamiento del camarón de Veracruz (Golfo de México

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    María Isabel Castro-González

    1998-06-01

    Full Text Available La composición química aproximada y la energía de las especies acompañantes del camarón utilizadas para consumo humano y animal se estudió en Alvarado, Vereacruz (Golfo de México. Cinco muestreos se realizaron entre septiembre de 1994 y marzo de 1995 en barcos camaroneros. Las muestras se congelaron a bordo para los análisis de laboratorio de la porción comestible. Los resultados indicaron 16 familias, 22 especies de peces y 1 molusco (calamar. Después de la humedad, la fracción química más abundante fue la proteína cruda con valores entre 14.3 y 19.6%. Los hidratos de carbono fueron desde 2.1 a 7.4%. El extracto etéreo (lípidos fue menos abundante pero variable numéricamente (0.5 a 3.8%, las cenizas se cuantificaron entre 0.10 y 0.24%. La energía presentó la menor variación numérica (4.5 a 5.2 kcal/g. 12 especies son empleadas como alimento animal y solo Pristipomoides aquilonaris se reportó como de uso exclusivo para este propósito; la composición química fue similar a la de las especies de consumo humano. Anchoa hepsetus, Synodus foetens, Cynoscion arenarius, Upeneus parvus y Trichiurus lepturus, se recomiendan para alimentación humana, especialmento por su bajo costo en la costa del Golfo de México.Chemical composition and energy content of the shrimp by-catch used for human and livestock consumption were studied in Alvarado, Veracruz (Gulf of Mexico. Five on-board samplings were done between September 1994 and March 1995 on shrimp ships off Veracruz. The samples were frozen on board for laboratory analysis of the edible portion, they included 16 families and 22 species of fishes and 1 mollusc (squid. After moisture, the crude protein was the most abundant chemical fraction (14.3 and 19.6%; carbohydrates were numerically variable in all groups (2.1 to 7.4%; ether extract (lipids was less abundant but variable (0.5 to 3.8%, ashes were 0.10 to 0.24%. Crude energy was less variable numerically (4.5 to 5.2 kcal/g; 12

  3. ADOPCIÓN DE INNOVACIONES EN LIMON ‘PERSA’ (Citrus latifolia Tan. EN TLAPACOYAN, VERACRUZ. USO DE BITÁCORA

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    Gustavo Almaguer-Vargas

    2014-01-01

    Full Text Available Con el fin de mejorar la eficiencia de la adopción de innovaciones tecnológicas en el cultivo de limón ‘Persa’ en San Pedro Tlapacoyan, Veracruz e incrementar el rendimiento de este frutal y la relación beneficio/costo (B/C de esta actividad eco- nómica, se empleó la “metodología de innovación de la bitácora”, la cual se trabajó con 26 productores de esta comunidad durante tres ciclos de producción: 2005/2006, 2006/2007 y 2007/2008. Esta metodología consistió en realizar un diag- nóstico, recomendaciones (asesoría, seguimiento, evaluación y control de innovaciones realizadas por el productor, por parte de un prestador de servicios profesionales. Las variables evaluadas fueron porcentaje de adopción de innovaciones, atributos de productores, ingresos, costos de producción, rendimiento y relación B/C. En el primer ciclo de producción se obtuvo un rendimiento de 5.24 t∙ha-1 y relación beneficio/costo de 1.55, atribuible al reducido porcentaje de adopción de innovaciones, que fue de 15. Después de aplicar la metodología propuesta, los ingresos del segundo ciclo se incremen- taron 64 % con respecto a los del ciclo inicial, y 41 % entre 2006/07 y 2007/08. La relación B/C aumentó 68 % (de 1.56 a 2.28, lo cual se asoció al incremento de 29.6 del porcentaje de adopción de innovaciones.

  4. PRODUCTIVIDAD DEL LIMÓN ‘PERSA’ INJERTADO EN CUATRO PORTAINJERTOS EN UNA HUERTA COMERCIAL DE VERACRUZ, MÉXICO

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    Sergio Alberto Curti-Díaz

    2012-01-01

    Full Text Available Veracruz, México, contaba con 36,166.36 ha plantadas con limón ‘Persa’ (Citrus latifolia Tan. en 2010, que produjeron 437,460.80 toneladas de fruta con un valor de 1,196.9 millones de pesos. Dado que los portainjertos influyen en el desarrollo vegetativo, producción y calidad de los frutos cítricos, en función de la especie de portainjerto, tipo de suelo y clima donde se cultiven, se comparó el comportamiento agronómico del limón ‘Persa’ de 11 años de edad, injertado en citrange Carrizo, citrumelo Swingle y en los limones Volkameriana y Rugoso, plantado a 4 x 6 m, en un suelo arcilloso, delgado y fuertemente ácido (pH 4.5. Se registraron las dimensiones del árbol, producción, eficiencia productiva y calidad de fruta de ocho cosechas, durante junio de 2008 a julio de 2009. Se obtuvieron los siguientes resultados relevantes: a Carrizo, Swingle y Volkameriana indujeron menor altura y volumen de copa que Rugoso, pero la conformación de copa del limón ‘Persa’ fue más ancha que alta, con todos ellos, b El rendimiento de fruta por árbol fue mayor con Rugoso, pero su eficiencia productiva igualó a la obtenida con Carrizo y Swingle, c Carrizo, Rugoso y Swingle indujeron mayor volumen de fruta con calidad de exportación (Estados Unidos, sin presentar diferencias entre ellos en cuanto a los calibres comerciales de la fruta producida, y d El comportamiento agronómico de Carrizo y Swingle, en cuanto a vigor, porte, eficiencia productiva, calidad de fruta y tolerancia a las termitas, ofrece mayores ventajas para cultivar limón ‘Persa’ en suelos de sabana.

  5. Concentración de Hg, Pb, Cd, Cr y As en hígado de Carcharhinus limbatus (Carcharhiniformes: Carcharhinidae capturado en Veracruz, México

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    Fernando Mendoza-Díaz

    2013-06-01

    Full Text Available La contaminación de los ecosistemas marinos y costeros por metales pesados en el Golfo de México es uno de los problemas que afectan a los recursos naturales del medio acuático. Los tiburones por situarse en niveles tróficos superiores de la red alimenticia acumulan y magnifican cantidades considerables de contaminantes. Por esta razón, el objetivo de este trabajo fue determinar la concentración de cuatro metales pesados (Hg, Cd, Pb y Cr y un metaloide (As en el tiburón punta negra (Carcharhinus limbatus por medio de espectrofotometría de absorción atómica con flama y generador de hidruros. Se muestrearon 19 hígados de tiburones capturados cerca de Tamiahua, Veracruz entre noviembre 2007 y marzo 2008, de los cuales 12 fueron machos adultos, una hembra adulta, tres machos jóvenes y tres hembras jóvenes. Las concentraciones máximas registradas para cada metal fueron: Hg=0.69mg/ kg, Cd=0.43mg/kg, As=27.37mg/kg, Cr=0.35mg/kg. El Pb no fue detectado, no al menos la cantidad mínima de detección requerida por el espectrofotómetro de absorción atómica (0.1mg/kg. Ninguna de las muestras analizadas rebasó los límites máximos permisibles por las leyes mexicanas y americanas.

  6. Value of Riparian Vegetation Remnants for Leaf-Litter Ants (Hymenoptera: Formicidae) in a Human-Dominated Landscape in Central Veracruz, Mexico.

    Science.gov (United States)

    García-Martínez, Miguel Á; Escobar-Sarria, Federico; López-Barrera, Fabiola; Castaño-Meneses, Gabriela; Valenzuela-González, Jorge E

    2015-12-01

    Riparian remnants are linear strips of vegetation immediately adjacent to rivers that may act as refuges for biodiversity, depending on their habitat quality. In this study, we evaluated the role of riparian remnants in contributing to the diversity of leaf-litter ants by determining the relationship between ant diversity and several riparian habitat characteristics within a human-dominated landscape in Veracruz, Mexico. Sampling was carried out in 2012 during both dry and rainy seasons at 12 transects 100 m in length, where 10 leaf-litter samples were collected along each transect and processed with Berlese-Tullgren funnels and Winkler sacks. A total of 8,684 individuals belonging to 53 species, 22 genera, and seven subfamilies were collected. The observed mean alpha diversity accounted for 34.4% of the total species recorded and beta diversity for 65.6%. Species richness and composition were significantly related to litter-layer depth and soil compaction, which could limit the distribution of ant species depending on their nesting, feeding, and foraging habits. Riparian remnants can contribute toward the conservation of ant assemblages and likely other invertebrate communities that are threatened by anthropogenic pressures. In human-dominated landscapes where remnants of riparian vegetation give refuge to a diverse array of myrmecofauna, the protection of the few remaining and well-preserved riparian sites is essential for the long-term maintenance of biodiversity. © The Authors 2015. Published by Oxford University Press on behalf of Entomological Society of America. All rights reserved. For Permissions, please email: journals.permissions@oup.com.

  7. Possible recovery of Acropora palmata (Scleractinia:Acroporidae within the Veracruz Reef System, Gulf of Mexico: a survey of 24 reefs to assess the benthic communities

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    Elizabeth A. Larson

    2014-09-01

    Full Text Available Recent evidence shows that Acropora palmata within the Veracruz Reef System, located in the southwestern Gulf of Mexico, may be recovering after the die off from the flooding of the Jamapa River and a dramatic cold water event in the 1970s. Since this decline, few surveys have documented the status of A. palmata. The 28 named reefs in the system are divided into 13 northern and 15 southern groups by the River. Between 2007 and 2013, we surveyed 24 reefs to assess the benthic communities. Seven of the 11 reefs surveyed in the northern group and all in the southern group had A. palmata. Colonies were typically found on the windward side of the reefs in shallow waters along the reef edges or crest. We also recorded colony diameter and condition along belt transects at two reefs in the north (Anegada de Adentro and Verde and two in the south (Periferico and Sargazo, between 2011 and 2013. In addition, eight permanent transects were surveyed at Rizo (south. A total of 1 804 colonies were assessed; densities ranged from 0.02 to 0.28 colonies/m² (mean (±SD, colony diameter of 58 ± 73cm, and 89 ± 18% live tissue per colony. Total prevalence of predation by damselfish was 5%, by snails 2%, and <1% by fireworms, disease prevalence was <3%. Size frequency distributions indicated that all of the sites had a moderate to high spawning potential, 15-68% of the colonies at each site were mature, measuring over 1 600cm². The presence of these healthy and potentially reproductive colonies is important for species recovery, particularly because much of the greater Caribbean still shows little to no signs of recovery. Conservation and management efforts of these reefs are vital.

  8. EFECTO DE LA IVERMECTINA EN LA DINÁMICA ESPACIO-TEMPORAL DE ESCARABAJOS ESTERCOLEROS EN VERACRUZ, MÉXICO

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    Carolina Flota-Bañuelos

    2012-05-01

    Full Text Available Los antihelmínticos formulados con ivermectina, se utilizan en los sistemas ganaderos de México. Sin embargo no se ha determinado su efecto sobre la abundancia, disposición espacio-temporal de los escarabajos coprófagos. Para estimar estos efectos, se realizaron colectas mensuales de julio del 2008 a junio del 2009, en un pastizal del centro de Veracruz. Se colocaron 20 trampas de pozo seco: diez trampas cebadas con estiércol sin químico (SI y diez trampas con estiércol con ivermectina (CI. Para estimar el efecto de la ivermectina, los datos se analizaron con el procedimiento MIXED de SAS v. 9.1. Mediante índices de dispersión, relación varianza media y K de la binominal negativa, se determinó el patrón de disposición espacial y temporal. Se colectaron 4569 escarabajos estercoleros, pertenecientes a la Familia Scarabaeidae, repartidas en tres Subfamilias Scarabaeinae, Geotrupinae y Aphodiinae, y 15 especies, siendo las más abundantes Euoniticellus intermedius Reiche y Digitonthophagus gazella F., representando el 65 % de los coleópteros encontrados. Existieron diferencias en las capturas de seis especies de escarabajos, siendo menores en las trampas CI en E. intermedius, D. colonicus, y C. lugubris, en junio del 2009. D. gazella y A. cribithorax presentaron menores colectas en trampas SI, en octubre y noviembre respectivamente. Los escarabajos presentaron disposición espacial agregada durante los doce meses, apareciendo las poblaciones más altas en el centro y sureste del pastizal. La presencia de ivermectina en el estiércol de ganado bovino no modificó la agregación de los escarabajos estercoleros presentes en la zona de estudio.

  9. EVALUACIÓN DEL POTENCIAL EÓLICO PARA LA GENERACIÓN DE ENERGÍA ELÉCTRICA EN EL ESTADO DE VERACRUZ, MÉXICO

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    QUETZALCOATL HERNÁNDEZ-ESCOBEDO

    2012-01-01

    Full Text Available El objetivo de este artículo es la evaluación del recurso eólico para su posible utilización en la generación de energía eléctrica en el Estado de Veracruz, México. Para ello se llevaron a cabo mediciones de viento registradas cada 10 minutos a 50m de altura durante los años 2008 y 2009 en 16 estaciones anemométricas distribuidas dentro del Estado. Se encontró que existen regiones en donde la velocidad promedio del viento es 5.45 m/s, valor que se ajusta para producir energía eléctrica de 14,432 kW mientras la velocidad se mantenga en ese rango. Para evaluar la potencia eléctrica que puede entregar un dispositivo comercial, se utilizó un aerogenerador marca ACCIONA modelo AW 70/1500 Class I que según el fabricante tiene una capacidad 1500kW, el estudió arrojó que instalando un aerogenerador por cada zona estudiada se suministraría energía eléctrica a la red de 10,694 MWh/año, con lo cual se podrán ahorrar 9,933.1 de Toneladas Equivalentes de Petróleo (TEP, y una reducción anual bruta de emisiones de Gases de Efecto Invernadero (GEI equivalentes a 28,806.1 toneladas de CO2 (tCO2. Adicionalmente, se obtuvo la estacionalidad anual de la velocidad media del viento, esto se realizó para observar la variabilidad del viento con respecto a las estaciones del año en el Estado.

  10. SISTEMAS AGRO Y SILVOPASTORILES EN LA COMUNIDAD EL LIMÓN, MUNICIPIO DE PASO DE OVEJAS, VERACRUZ, MÉXICO

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    Marcelo Bautista Tolentino

    2010-09-01

    Full Text Available La caracterización de los sistemas agroforestales es una buena herramienta que proporciona elementos de análisis para la toma de decisiones en sistemas de uso del suelo. El objetivo de esta investigación fue caracterizar los sistemas agroforestales de acuerdo a sus componentes (agrícola, forestal y pecuario y al principal uso de las especies arbóreas en la comunidad El Limón, municipio de Paso de Ovejas, Veracruz. Se seleccionaron 24 agroecosistemas (AES con ganadería donde se realizaron recorridos de campo y aplicaron entrevistas semiestructuradas a productores. Se identificaron un total 106 sitios de los cuales 78 se clasificaron como sistemas silvopastoriles, 26 en sistemas agrosilvopastoriles y dos fracciones de vegetación secundaria (acahual; de todos los sitios, en el 59% el componente forestal tuvo la función principal de proporcionar leña, 16.2% sombra, 11.4% forraje, 5.7% postes, 6.7% cercas vivas y 1% frutal. Se identificaron un total de 70 especies arbóreas nativas e introducidas. Se concluye que el sistema más común en estos AES es el sistema silvopastoril el cual está integrado por bovinos, Panicum maximum Jacq. y árboles dispersos de distintas especies, mientras que los agrosilvopastoriles están compuestos de maíz, bovinos y especies arbóreas en cercas vivas.

  11. A genetic algorithm to solve a three-echelon capacitated location problem for a distribution center within a solid waste management system in the northern region of Veracruz, Mexico

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    María del Rosario Pérez-Salazar

    2015-01-01

    Full Text Available México es el tercer consumidor mundial de Tereftalato de Polietileno (PET, sólo después de Estados Unidos y China. El PET es utilizado comúnmente para fabricar recipientes de plástico tales como botellas para bebidas y empaques para alimentos. Se puede argumentar que el principal problema con respecto a la contaminación generada por los residuos de PET radica en una inadecuada gestión de residuos sólidos. Proponemos un modelo de programación entera mixta del problema de localización de instalaciones capacitado y luego un algoritmo genético es desarrollado para optimizar este modelo. El problema se describe de la siguiente manera: dada la cantidad de PET generado en la región norte de Veracruz, México, considerando cinco ciudades y cada una como una fuente de generación única, un centro de recolección tiene que ser seleccionado entre un conjunto de lugares previamente determinados en la ciudad de Tempoal, Veracruz; con el fin de servir a un conjunto de puntos de demanda en el mercado re-uso; se asume que las demandas como parámetros de incertidumbre. El objetivo es minimizar el costo total del sistema.

  12. Evaluación de fenoles y limonoides en hojas de Cedrela odorata (Meliaceae de una plantación experimental establecida en Tezonapa Veracruz, México

    Directory of Open Access Journals (Sweden)

    Samantha del Rocío Mariscal-Lucero

    2015-06-01

    Full Text Available Cedrela odorata (Meliaceae es una especie forestal maderable nativa de América Tropical, conocida por la alta calidad de su madera. Plantaciones de esta especie son atacadas severamente por Hypsipyla grandella; la atracción o repelencia de la plaga está relacionada con metabolitos secundarios tipo fenoles y limonoides (triterpenos, por lo que el estudio de estos compuestos es importante para comprender algunos fenómenos fitoquímicos. Se evaluó la concentración de fenoles totales y limonoides en hojas de C. odorata (Meliaceae de una plantación establecida en Tezonapa Veracruz México, se analizaron 66 individuos de siete procedencias. La concentración de fenoles y limonoides mostró diferencias significativas, no solo entre las procedencias sino también entre los árboles de una determinada procedencia (Tukey, p≤0.05. La concentración de fenoles totales varió de 49 a 223mg EAG/g e, los flavonoides de 7 a 158mg EC/g e y las proantocianidinas de 4 a 104mg EC/g e, mientras que en limonoides se obtuvieron valores de 227 a 748mg EL/g e. Mediante Cromatografía Líquida de Alta Resolución con detector UV-Arreglo de Diodos (HPLC-UV-DAD se encontró un compuesto mayoritario que corresponde a un flavonol de tipo glicósido de Kaempferol y se identificó el flavanol catequina a bajas concentraciones. Por medio de Cromatografía de Gases-Espectrometría de Masas (CG-MS se identificaron los sesquiterpenos β-elemeno, E-cariofileno, aromadendreno, humuleno, gama-cadineno, D-germacreno, biciclogermacreno y los poli terpenos Di-α-Tocoferol y β-sitosterol. Nuestros resultados sugieren que la evaluación de los fenoles puede desempeñar un papel importante como parámetro de selección en programas de mejora y conservación, si se complementan con las prácticas convencionales de mejoramiento genético.

  13. Evaluación geográfica de áreas susceptibles a inundación en la cuenca del río Tuxpan, Veracruz

    Directory of Open Access Journals (Sweden)

    E. A. Ellis

    2012-01-01

    Full Text Available Existen eventos hidrometereológicos que, periódicamente, han provocado serias inundaciones en la Cuenca del río Tuxpan, Veracruz (México, dejando severos daños económicos y humanos. El objetivo del presente trabajo fue el de evaluar geográficamente las áreas susceptibles a la inundación en la cuenca con relación a distintos periodos de retorno de precipitación máxima, en 24 horas. Se integraron técnicas de Sistemas de Información Geográfica para el cálculo de gastos máximos, aplicando el método Ven Te Chow en cada microcuenca o unidad hidrológica. Adicionalmente, se empleó el modelo hidráulico de cauces abiertos, hec-ras 4.0, para modelar la superficie inundada. Para los insumos del modelo se emplearon los datos geográficos de la red hidrológica, el modelo de elevación, edafología y vegetación y uso de suelo. Los resultados indican una superficie de inundación que varía entre 522 km2 para periodos de retorno de dos años y hasta 554 km2 para periodos de retorno de 100 años. Las áreas con mayor afectación son las agrícolas, con 343 km2 y las áreas urbanas, con 15 km2 para periodos de retorno correspondientes a 100 años, resultando con severos daños económicos. Las zonas urbanas más afectadas incluyen las ciudades de Álamo-Temapache y Tuxpan. Los modelos aplicados y los resultados obtenidos en esta evaluación aportan información y validan una herramienta útil para la investigación y toma de decisiones sobre las estrategias y medidas de prevención y mitigación de los impactos inundación.

  14. [Influence of sediments and tungsten traces on the skeletal structure of Pseudodiploria: a reef building scleractinian coral from the Veracruz Reef System National Park, Mexico].

    Science.gov (United States)

    Colín-García, Norberto A; Campos, Jorge E; Tello-Musi, Jose Luis; Arias-González, Jesús E

    2016-09-01

    Coral reefs are under intense conditions of stress caused by the anthropogenic activities in coastal areas and the increase of human population. Water effluents from urban and industrial areas carry large amounts of sediments and pollutants affecting corals populations, inducing bioerosion, increasing diseases and promoting the development of algae that compete for space with corals. In the Veracruz Reef System National Park (VRSNP) coral reefs are strongly affected by human activities carried out in the area. Gallega and Galleguilla reefs are among the most affected by wastewater discharges from the industrial (petrochemical and metallurgical) and urban areas in their vicinity. To assess the potential impact of this contamination on corals in the VRSNP, a chemical composition and morphology study of 76 Pseudodiploria colonies collected in reefs Gallega, Galleguilla, Isla Verde and Isla de Enmedio, was performed. Fragments of ~10 cm2 were collected and boric acid at 0.5 % was used to remove tissue from the skeleton; once clean, the morphology of each sample was determined with a scanning electron microscope (SEM). Subsequently, to test the chemical composition, an energy dispersion spectroscopy of X-ray chemical microanalysis (EDSX) was performed in the SEM. We found that corals from Gallega and Galleguilla reefs, located closer to human populations, presented high levels of tungsten and the skeleton exhibited multiple perforations. In contrast, corals from the farthest offshore reefs (Isla Verde and Isla de Enmedio) exhibited lower levels of tungsten and fewer perforations in their skeleton. These results demonstrated that anthropogenic activities in the NPVRS are affecting corals skeleton, highly damaging and promoting their bioerosion. The presence of traces of tungsten in the skeleton of corals is an evidence of the damage that waste discharges are causing to coral reefs. Discharges of large amounts of contaminants promoted the growth of harmful species that

  15. 30 years in the Veracruz state coast landscape: Laguna Verde nuclear power station. 1. ed.; 30 anos de paisaje costero veracruzano: Central Nucleoelectrica Laguan Verde

    Energy Technology Data Exchange (ETDEWEB)

    Guevara, S; Moreno Casasola, P; Castillo Campos, G; Dorantes, C; Gonzalez Garcia, F; Halffter, G; Isunza, E; Lot H, A; Mendoza, R; Paradowska, K; Priego, A; Sanchez Vigil, C; Vazquez, G [Comision Federal de Electricidad and Instituto Nacional de Ecologia A.C. (Mexico)

    2008-07-01

    36 years ago one of the most important power projects of Mexico was born; the design and construction of the Nuclear power station Laguna Verde. This project became reality thanks to the commitment of a group of Mexican professionals that gave the best of them for its accomplishment. At that time, there was not in Mexico a legislation that contemplated the environmental protection; nevertheless, the Mexican Constitution anticipates that when in the country there is not legislation for the development of a project, this must adopt the legislation of the country that is selling it. In the specific case of Laguna Verde, the legislation of the United States of America was adopted and in the environmental part it had to issue the first Manifest of Environmental impact, that was called Informe Ambiental para la Contruccion de Laguna Verde en el Estado de Veracruz. This study was performed by several national as well as foreign institutions. Among the most outstanding are the Universidad Nacional Autonoma de Mexico, the Intituto Politecnico Nacional, the Universidad Veracruzana, the Intituto National para la Investigacion de Recursos Biologicos, the Instituto de Ecologia, A.C. With this report, the engineers undertook the task of designing and constructing, the biologists and ecologists to realize the studies to mitigate the effects caused to the environment during the construction and later, during the operation of the Nuclear power station. After 18 years of commercial operation of the power station the present book is completed, in which the results obtained in 1972, when the studies of the environmental report began are compared against the ones obtained throughout this period. It is important to see in the results of the different studies and indicators presented/displayed in this book, that the important changes on the environment are due, to the change of the ground use and the over-exploitation of the natural resources as it happens in almost all the country. The

  16. La cofradía de la Santa Veracruz y los planos arquitectónicos más antiguos de San Luis Potosí: Un ejemplo del corporativismo novohispano a través de la arquitectura

    OpenAIRE

    Hernández Soubervielle, Armando

    2014-01-01

    El presente artículo discurre por tres ejes fundamentales. El primero de ellos es aportar información obtenida de fuentes primarias, referente a la cofradía de la Santa Veracruz de San Luis Potosí, lo que sirve para dar a conocer y analizar por primera vez los planos arquitectónicos más antiguos (1620) de San Luis Potosí, mismos que hasta ahora estaban inéditos. A la luz de estos planos y su interpretación, se mostrará su relación con el tratado de arquitectura de Sebastián Serlio y de cómo e...

  17. Determinación de zonas agroclimáticas para la producción de mango (Mangifera indica L. “Manila” en Veracruz, México

    Directory of Open Access Journals (Sweden)

    Jorge Luis Martínez Fonseca

    2012-02-01

    Full Text Available El mango (Mangifera indica L. es un frutal de importancia económica en México, en el 2004 se reportaron 166 000 ha plantadas en más de once estados del país, en el estado de Veracruz 25 550 ha, donde el 85% es de la variedad “Manila”. El objetivo de este trabajo fue determinar las regiones agroclimáticas para el cultivo de mango “Manila” en el estado de Veracruz, México, por medio del Análisis de Componentes Principales (ACP con variables climatológicas (temperatura, precipitación, evaporación y radiación solar, además se elaboraron gráficas hidro-termales (relacionando: precipitación total y temperatura mínima mensual. Del ACP se derivaron dos vectores asociados con la temperatura mínima anual y precipitación total anual, que juntos explican el 83% de la variación climática total entre las localidades productoras de mango “Manila”; se definieron dos grupos de localidades con agroclimas diferentes, mismos que se confirmaron con las gráficas hidro-termales; con apoyo de información bibliográfica y de productividad, se definieron tres zonas de aptitud agroclimáticas para el cultivo de mango “Manila”, con los siguientes intervalos de variación de la temperatura mínima anual: zona 1 (No Apta menor de 13.5° C; zona 2 (Apta de 13.5 a 17.5° C; zona 3 (Moderadamente Apta de 17.5 a 23.0° C. Con un modelo empírico de temperatura mínima y un modelo de elevación digital, por medio de un sistema de información geográfica (SIG, se realizó la cartografía de las zonas geográficas con diferente grado de aptitud Agroclimática.

  18. "CATÓLICOS, APOSTÓLICOS Y NO-SATÁNICOS ": REPRESENTACIONES CONTEMPORÁNEAS EN MÉXICO Y CONSTRUCCIONES LOCALES (VERACRUZ DEL CULTO A LA SANTA MUERTE.

    Directory of Open Access Journals (Sweden)

    Kali Argyriadis

    2014-06-01

    Full Text Available Este artículo, mediante un enfoque basado en un cuestionamiento de la oposición clásica entre religión institucional y religiosidad popular, propone analizar la manera en que los devotos del culto a la Santa Muerte, en interacción con los medios de comunicación, los discursos académicos y las denuncias de la Iglesia Católica Mexicana, construyen en la actualidad varios sistemas locales de sentido. Basado en una reseña crítica de los trabajos existentes sobre el tema, este estudio se nutre también de una etnografía propia llevada a cabo en la ciudad de Veracruz entre 2004 y 2011. Intenta mostrar en particular cómo los debates sobre la historia y/o la legitimidad del culto han desencadenado una búsqueda de reconocimiento por parte de los fieles, así como el inicio de un proceso de construcción de la tradición, con vertientes nacional y regionales, en un contexto de intensas luchas de poder inter- e intra-grupos. Finalmente, propone pistas de reflexión para profundizar la investigación sobre esta devoción.

  19. Producción de frutos y semillas de dos especies arbóreas nativas en un bosque mesófilo de montaña de Veracruz, México

    Directory of Open Access Journals (Sweden)

    Yureli García-De La Cruz

    2015-07-01

    Full Text Available Se estimó y comparó la producción de frutos y semillas de una muestra de árboles pertenecientes a Alchornea latifolia y Liquidambar styraciflua en un bosque de niebla en la zona centro del estado de Veracruz. Los individuos se seleccionaron con base en sus características fenotípicas; se tomaron datos estructurales (diámetro a la altura del pecho, altura y cobertura y éstas se compararon con la producción semillera en cada especie. Se estimó una producción de 70 380 frutos, 140 760 semillas y 6.02 kg por árbol en Alchornea latifolia y, 5 738 frutos, 303 218 semillas y 0.7 kg por árbol en Liquidambar styraciflua. Ninguna de las variables estructurales de los árboles superiores contribuyó a explicar la producción de frutos y semillas. Sin embargo, la variación entre individuos (identidad del árbol contribuyó a explicar las diferencias observadas en la producción de infrutescencias por rama, el número de semillas por infrutescencia, así como el peso de las semillas por infrutescencia en ambas especies.

  20. CARACTERIZACIÓN SOCIOECONÓMICA Y TECNOLÓGICA DE LOS AGROECOSISTEMAS CON BOVINOS DE DOBLE PROPÓSITO DE LA REGIÓN DEL PAPALOAPAN, VERACRUZ, MÉXICO

    Directory of Open Access Journals (Sweden)

    Julio Vilaboa-Arroniz

    2008-12-01

    Full Text Available El objetivo del presente trabajo fue caracterizar los componentes tecnológicos y socioeconómicos en los agroecosistemas con bovinos de doble propósito de la Región del Papaloapan, Veracruz, México. Se diseño y aplicó entrevistas semi-estructuradas a productores en las Asociaciones Ganaderas Locales y en ranchos ganaderos de los 21 municipios de la región objeto de estudio. Las variables incluidas fueron sociales, técnicas y de comercialización. El tamaño de muestra fue de 405 productores que representan el 4% del total de los ganaderos de la región. Se utilizó el análisis cluster, estadística descriptiva y tablas de contingencia. El análisis cluster, de acuerdo a las variables consideradas, permitió caracterizar a los productores en tres grupos: tradicional, de transición y empresarial. La edad para estos grupos de ganaderos fue 53±13, 54±15 y  56±12 años, y las cargas animal fueron 42.8±38.9, 154.1±88.3 y 123.8±93.5, respectivamente. En general, la finalidad zootécnica fue ganado doble propósito (86.9%, con pastoreo extensivo a libre pastoreo (98% como el sistema predominante y un patrón racial de la cruza Suizo x Cebú (79.8% como el más representativo.

  1. Primer registro de la gaviota sombría (Larus fuscus en el estado de Veracruz, México: información sobre sus patrones de expansión en el Continente Americano

    Directory of Open Access Journals (Sweden)

    José Arturo García-Domínguez

    2015-06-01

    Full Text Available Reportamos el primer registro de la gaviota sombría (Larus fuscus en el estado de Veracruz; se trata de una especie cuya distribución geográfica ha estado expandiéndose, de Europa occidental hacia Norteamérica, desde la primera mitad del siglo XX hasta la fecha. Anida de forma regular en por lo menos dos áreas en el suroeste de Groenlandia, en las que la población reproductiva se ha estimado en más de 700 parejas. Su expansión parece estar ocurriendo también hacia el sur, ya que comenzó a reproducirse en las Islas Canarias a partir de 1995. El primer evento reproductivo confirmado en Norteamérica fue en Maine, EUA, en 2007. En México, el primer registro sucedió en 1979; la especie ha sido reportada en seis estados, con un notable incremento durante los últimos años. Nuestro registro ocurrió el 16 de marzo de 2008. La mayoría de los individuos registrados en el este de Norteamérica posiblemente provengan de poblaciones reproductivas ubicadas en Groenlandia o en Islandia, y quizá estén funcionando como puentes geográficos entre Europa noroccidental y Norteamérica. Con base en sus patrones migratorios y de expansión geográfica, y en el aumento de sus colonias reproductivas, L. f. graellsii es la subespecie que puede ocurrir más comúnmente en Norteamérica. Las características morfológicas del individuo registrado en este trabajo son consistentes con dicho taxón. Si consideramos la regularidad y la cantidad de registros en diferentes regiones del continente, es probable que la presencia de la especie se encuentre subestimada en las costas mexicanas del Golfo de México, siendo en realidad una especie regular, aunque poco abundante.

  2. Spinitectus mexicanus n. sp. (Nematoda : Cystidicolidae) from the intestine of the freshwater fish Heterandria bimaculata in Mexico.

    Science.gov (United States)

    Caspeta-Mandujano, J M; Moravec, F; Salgado-Maldonado, G

    2000-02-01

    A new nematode, Spinitectus mexicanus n. sp., is described on the basis of the specimens recovered from the intestine of Heterandria bimaculata (Heckel) (Poeciliidae, Cyprinodontiformes) from 3 rivers of the Papaloapan River basin (type locality La Basura River), Los Tuxtlas, Veracruz State, Mexico. It differs from its congeners mainly in having the spination of the cuticle separated into 4 longitudinal sectors, each with posteriorly diminishing numbers of larger spines at the anterior part of body. It is the first species of Spinitectus described from a poeciliid fish and the second reported from freshwater fishes in Mexico.

  3. El género Ormosia Jacks: (Leguminosae, Papilionoideae) en el estado de Guerrero, México

    OpenAIRE

    Cruz-Durán, Ramiro; Jiménez-Ramírez, Jaime

    2015-01-01

    Se registra por primera vez la presencia del género Ormosia para el estado de Guerrero, México, con dos especies: Ormosia carinata y O. oaxacana (Leguminosae, Papilionoideae, tribe Sophoreae). Se incluyen las descripciones de ambas, datos referentes a los ejemplares, una clave dicotómica para diferenciarlas, y la ilustración de O. carinata. Ormosia carinata era conocida como elemento endémico de los estados de Veracruz y Oaxaca, en las regiones de Los Tuxtlas y de Uxpanapa. Ormosia carinat...

  4. Impact of anthropogenic disturbances on the diversity of shallow stony corals in the Veracruz Reef System National Park Impacto de perturbaciones antrópicas sobre la diversidad de corales pétreos superficiales en el Parque Nacional Sistema Arrecifal veracruzano

    Directory of Open Access Journals (Sweden)

    Carla V. Gutiérrez-Ruiz

    2011-03-01

    Full Text Available Anthropogenic disturbances may affect the development and maintenance of coral reefs by promoting diseases and other syndromes. In turn, this may cause local decreases in coral species diversity. In this study, we compared the prevalence of syndromes (including diseases and non-disease syndromes and the diversity of stony coral species between reefs located close (Sacrificios reef and far away (Santiaguillo reef of the port of Veracruz, Mexico. The prevalence of syndromes was higher at Sacrificios than at Santiaguillo, and it also increased with the abundance of coral colonies at the former reef. On the other hand, coral diversity was lower at Sacrificios than at Santiaguillo, suggesting that anthropogenic disturbances, besides promoting diseases and other syndromes, also lead to local decreases in species diversity.Las perturbaciones antropogénicas pueden afectar el desarrollo y mantenimiento de los arrecifes de coral mediante la promoción de las enfermedades y otros síndromes. A su vez, esto puede producir un descenso en la diversidad local de especies. En este estudio, se comparó la prevalencia de síndromes (tanto aquellos causados por enfermedades, como por otros factores y la diversidad de especies de corales pétreos entre arrecifes ubicados cerca (Sacrificios y lejos (Santiaguillo del puerto de Veracruz, México. La prevalencia de síndromes fue mayor en Sacrificios que en Santiaguillo, y también se incrementó con la abundancia de colonias de coral en Sacrificios. Por otra parte, la diversidad de corales fue menor en Sacrificios que en Santiaguillo, sugiriendo que las perturbaciones antropogénicas, además de promover las enfermedades y otros síndromes, también disminuyen localmente la diversidad de especies.

  5. El municipio de Pajapan en la Sierra de Santa Marta (Veracruz, México: un caso de resistencia indígena en la defensa del territorio y los recursos naturales para la sustentabilidad de los pueblos originarios del Gran Caribe.

    Directory of Open Access Journals (Sweden)

    Jesús Moreno Arriba

    2015-01-01

    Full Text Available El municipio de Pajapan, en la Sierra de Santa Marta (Veracruz, México, representa un caso paradigmático en la lucha por la defensa de las tierras comunales de las comunidades indígenas campesinas del Gran Caribe, recurriendo a distintos mecanismos de resistencia. Además, desde la implementación de metodología de investigación cualitativa, como la revisión bibliográfica y documental del tema de estudio, este trabajo ha identificado y analizado diversos proyectos de gestión de recursos naturales en el entorno geográfico de Pajapan y la Sierra de Santa Marta. Estas emergentes experiencias no gubernamentales se presentan como un posible modelo de desarrollo alternativo para intentar contribuir a mejorar la precaria situación actual (ecológica, demográfica y socioeconómica de los territorios tropicales y pueblos indígenas mesoamericanos del Gran Caribe.

  6. Remote measurement of ozone in Tuxtla Gutierrez, Chiapas, Mexico, using the DOAS technique

    International Nuclear Information System (INIS)

    Garcia, C.; Najera, H.; Camas, J.

    2012-01-01

    A brief description of a remote pollutants monitoring system based on passive differential optical absorption spectroscopy, which detects atmospheric trace gases. This system was placed in the campus facilities of the UNICACH, monitoring a linear extension approximately 2.9 km. We determined the concentration of ozone in the area of interest, also evaluating the influence of climatic conditions with the results obtained at the end were compared with a detection system used by the SEMAVIH, dependence government, observing a good correlation between them. (Author)

  7. Loss of arbuscular mycorrhizal fungal diversity in trap cultures during long-term subculturing.

    Science.gov (United States)

    Trejo-Aguilar, Dora; Lara-Capistrán, Liliana; Maldonado-Mendoza, Ignacio E; Zulueta-Rodríguez, Ramón; Sangabriel-Conde, Wendy; Mancera-López, María Elena; Negrete-Yankelevich, Simoneta; Barois, Isabelle

    2013-12-01

    Long-term successional dynamics of an inoculum of arbuscular mycorrhizal fungi (AMF) associated with the maize rhizosphere (from traditionally managed agroecosystems in Los Tuxtlas, Veracruz, Mexico), was followed in Bracchiaria comata trap cultures for almost eight years. The results indicate that AMF diversity is lost following long-term subculturing of a single plant host species. Only the dominant species, Claroideoglomus etunicatum, persisted in pot cultures after 13 cycles. The absence of other morphotypes was demonstrated by an 18S rDNA survey, which confirmed that the sequences present solely belonged to C. etunicatum. Members of Diversisporales were the first to decrease in diversity, and the most persistent species belonged to Glomerales.

  8. Ecoturismo Comunitario y Género en la Reserva de la Biosfera de Los Tuxtlas (México

    Directory of Open Access Journals (Sweden)

    Díaz Carrión, Isis Arlene

    2010-01-01

    Full Text Available Communities living in natural protected area are faced with the need to modify their way of life. Those changes refer not only to an inevitable shift in production activities, but also aspects of their society and culture. This shift may allow for an expanded role for women. Ecotourism can be an opportunity for women to engage in not just environmental education, but to play an expanded role in the control and use of resources, and as active participants in designing their communities' development.

  9. Ecoturismo Comunitario y Género en la Reserva de la Biosfera de Los Tuxtlas (México

    Directory of Open Access Journals (Sweden)

    Isis Arlene Díaz Carrión

    2010-01-01

    Full Text Available Como consecuencia de la declaración de un Área Natural Protegida quienes habitan esas tierras se encuentran con la necesidad de modificar algunos aspectos de sus vidas; dichas modificaciones no solo se refieren a un cambio en la actividad productiva, también implican un cambio sociocultural. Cuando estos cambios son aprovechados para además modificar las normas sociales en materia de género es posible abrir espacios para las mujeres; es así como el ecoturismo puede utilizarse como alternativa económica, como herramienta de educación ambiental, y como una oportunidad para el control de los recursos y activa participación de las mujeres en el diseño del desarrollo de sus comunidades.

  10. Dating of the archaeological site 'El Tigre' by the thermoluminescent method; Fechamiento del sitio arqueologico 'El Tigre' por el metodo de termoluminiscencia

    Energy Technology Data Exchange (ETDEWEB)

    Portilla, R. De la [ENAH, Periferico Sur y Zapote, 14030 Mexico D.F. (Mexico); Gonzalez, P.R.; Mendoza, D. [ININ, 52750 La Marquesa, Ocoyoacac, Estado de Mexico (Mexico); Vargas, E. [Instituto de Investigaciones Antropologicas, UNAM, 04510 Mexico D.F. (Mexico); Ramirez, A. [Instituto de Geofisica, UNAM, 04510 Mexico D.F. (Mexico)

    2007-07-01

    Full text: The dating of pre hispanic pottery, is supported by techniques such as stratigraphy, typology, in physical and chemical procedures, as the analysis of {sup 14}C and the thermoluminescence (TL). The last one permits us obtain absolute dating of archaeological pottery with an acceptable precision. In this work we apply the applied the thermoluminescent technique to verify the age of the Pre-Classic and Classic Terminal periods proposed for the archaeological site 'El Tigre', Campeche. The samples were obtained during a work period and the radiation of the ground of background (emitted by the ground), as well as the contribution of the cosmic radiation was measured with thermoluminescent dosemeters of LiF: Mg,Cu,P + PTFE, put in the sample zone. The preliminary results indicate that not all the analyzed samples can be dated. The viability of the dating of the samples is discussed based on the fact and function of the presence of certain crystalline phases such as calcite and quartz. The discussion is complemented emphsizing the importance of handling the conditions of handling of samples. (Author)

  11. Decadal changes and delayed avian species losses due to deforestation in the northern Neotropics

    Directory of Open Access Journals (Sweden)

    David W. Shaw

    2013-10-01

    Full Text Available How avifauna respond to the long-term loss and fragmentation of tropical forests is a critical issue in biodiversity management. We use data from over 30 years to gain insights into such changes in the northernmost Neotropical rainforest in the Sierra de Los Tuxtlas of southern Veracruz, Mexico. This region has been extensively deforested over the past half-century. The Estación de Biología Tropical Los Tuxtlas, of the Universidad Nacional Autónoma de México (UNAM, protects a 640 ha tract of lowland forest. It became relatively isolated from other forested tracts between 1975 and 1985, but it retains a corridor of forest to more extensive forests at higher elevations on Volcán San Martín. Most deforestation in this area occurred during the 1970s and early 1980s. Forest birds were sampled on the station and surrounding areas using mist nets during eight non-breeding seasons from 1973 to 2004 (though in some seasons netting extended into the local breeding season for some species. Our data suggested extirpations or declines in 12 species of birds subject to capture in mist nets. Six of the eight species no longer present were captured in 1992–95, but not in 2003–2004. Presence/absence data from netting and observational data suggested that another four low-density species also disappeared since sampling began. This indicates a substantial time lag between the loss of habitat and the apparent extirpation of these species. Delayed species loss and the heterogeneous nature of the species affected will be important factors in tropical forest management and conservation.

  12. Texture, mineralogy and geochemistry of the continental slope sediments in front of Los Tuxtlas, Gulf of Mexico, Mexico: implications on weathering, origin and depositional environments

    Science.gov (United States)

    Marca-Castillo, M. E.; Armstrong-Altrin, J.

    2017-12-01

    The textural analysis, mineralogy and geochemistry of two sediment cores recovered from the deep water zone of the southwestern part of the Gulf of Mexico ( 1666 and 1672 m water depth) were studied to infer the provenance and depositional behavior. The textural analysis revealed that both cores are dominated by silt, which occupy more than 50% in both samples and the clay occupy 40%. The petrographic analysis revealed remains of biogenic origin sediments and lithic fragments with an angular shape and low sphericity, indicating a low energy environment and therefore a low level of weathering in the sediment, which suggests that the sediments were not affected by transport and derived from a nearby source rock. In both cores quartz fragments were identified; also volcanic lithic and pyroxenes fragments, which are rocks of intermediate composition and are generally associated with the volcanic activity of the continental margins. SEM-EDS studies showed that the analysed samples have concentrations of minerals such as barite, gibbsite, kaolinite, grossular, magnetite, plagioclase and chlorite, which are probably derived from the mainland to the deep sea zone. In the trace element analysis it was observed a low Sc content, while Co, Ni, V and Cu are slightly enriched with respect to the upper continental crust; this enrichment is related to sediments from intermediate sources. The sediments are classified as shale in the log (SiO2 / Al2O3) - log (Fe2O / K2O) diagram. The fine particles of the shale indicate that a deposit occurred as a result of the gradual sedimentation due to relatively non-turbulent currents, which is consistent with the petrographic analysis. The geochemical features of major and trace elements suggest sediments were derived largely from the natural andesite erosion of coastal regions along the Gulf of Mexico. High values of Fe2O3 and MnO are observed in the upper intervals, reflecting the influence of volcanic sediments. The major element discriminant function diagrams indicate the provenance of sediments from a passive margin, which is consistent with the geology of the Gulf of Mexico.

  13. Aspects of the Reproductive Biology of Stenanona Flagelliflora (Annonaceae)

    International Nuclear Information System (INIS)

    Lara, L. X.; Castro, D. M. F.; Hernandez, A. R. A.; Villanueva, A. C.

    2016-01-01

    Stenanona flagelliflora was described in 2004. There are no studies on its biology. The goal of this study was to document some aspects of its reproductive biology. The particular objectives were to: i) describe the variation on vegetative and floral traits; ii) establish the composition of the community of floral visitors; iii) estimate the mating system and reproductive success; and, iv) establish the relationship between vegetative traits and reproductive success. The study was conducted within the Los Tuxtlas Biosphere Reserve, Veracruz, Mexico. We quantified several vegetative and floral traits; conducted observations and collected floral visitors; and determined the mating system and reproductive success. Stenanona flagelliflora has relatively few stamens and carpels, but a relatively high viability of pollen grains. The most abundant floral visitors were dipterans from the Phoridae Family. Mating system is between xenogamous and facultative xenogamous; thus, pollination depends upon pollen vectors. Fruit-set was relatively high; but seed-set was very low, because most monocarps did not contain seeds. Our results suggest that reproduction of S. flagelliflora is not limited by resource availability, but by pollinator frequency and effectiveness. To our knowledge, this is the first study on the reproductive biology of a species within the Stenanona genus. (author)

  14. [Enviromental factors related to depressive disorders].

    Science.gov (United States)

    Hernández-Benítez, Catalina Teresa; García-Rodríguez, Alfonso; Leal-Ugarte, Evelia; Peralta-Leal, Valeria; Durán-González, Jorge

    2014-01-01

    As a result of their high prevalence, mayor depressive disorder single episode (MDDSE); major depressive disorder recurrent episodes (MDDREC); and dysthymia are considered an important public health problem. The objective of this paper was to identify and correlate environmental factors in patients with MDDSE, MDDREC and dysthymia. 121 patients from the Instituto Mexicano del Seguro Social's Subzone General Hospital of San Andres Tuxtla, at Veracruz, were questioned by history with the risk variables. 16 of them were diagnosed with MDDREC, 72 with MDD and 33 with dysthymia; in all of those cases, females prevailed. Depressive disorders were observed more frequently in people over 40 years, married, with medium or low educational level, with dysfunctional family environment, victims of family violence and who were the middle siblings. The main comorbidities that arose were gastrointestinal disorders, obesity and hypertension. 16 of them were diagnosed with MDDREC, 72 with MDD and 33 with dysthymia; in all of those cases, females prevailed. Depressive disorders were observed more frequently in people over 40 years, married, with medium or low educational level, with dysfunctional family environment, victims of family violence and who were the middle siblings. The main comorbidities that arose were gastrointestinal disorders, obesity and hypertension. The main risk factors identified for developing depressive disorders were: being female, over 40 years old and being married. The differences obtained in this study, if it is compared with others, are probably due to sample size, selection criteria and ethnic origin.

  15. FORAGE PRODUCTIVITY IN AGROECOSYSTEMS USING TRADITIONAL AND ROTATIONAL CATTLE GRAZING IN PASO DE OVEJAS, VERACRUZ, MEXICO

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    Marcelo Bautista-Tolentino

    2011-11-01

    Full Text Available Forage biomass and chemical composition of Megathyrsus maximus (Jacq. B.K. Simon & S.W.L. Jacobs were assessed in monoculture (P or associated with trees of Guazuma ulmifolia Lam. (PGu or Gliricidia sepium (Jacq. Kunth ex Walp (PGs, under traditional (TG or rotational (RG cattle grazing regimes, by season of the year (windy: October-February, dry: March-June, and rainy: July-September and annually. Annual forage production (kg DM ha-1 under RG and TG was 8049±586 and 4170±319, respectively; 5441±2225 in P-TG, 2022±82 in PGs-TG, 12326±2094 in PGu-TG, 9612±1331 in PGs-RG, and 7976±737 in PGu-RG. Gliricidia sepium produced 1448±2 and 1660±3 kg DM ha-1 year-1 under PGs-TG and PGs-RG, respectively. Forage yield across plant associations and grazing regimes was higher in the rainy season (5333.6±56.7 kg DM ha-1, and decreased in the windy (2462±349.0 kg DM ha-1 and dry seasons (252.9±2 kg DM ha-1. The PGu system had the highest crude protein content annually (21.8 % and by season (23.1 %, windy, and also showed the least neutral detergent fiber content during the year (55.2 % and by season (55.2 %, rainy. Biomass production and chemical composition of M. maximus in monoculture or associated with G. ulmifolia and G. sepium can be increased by modifying the traditional grazing regimes to a more intensive rotational system during the growth period of the year.

  16. Assessment of hydric balance through climatic variables, in the Cazones River Basin, Veracruz, Mexico

    Directory of Open Access Journals (Sweden)

    Eduardo Santillán Gutiérrez

    2014-09-01

    Full Text Available The hydrologic regime and the water catchment capacity of a hydrographic basin depend on the temporal and spatial variation patterns of climatic variables and on the physiographic characteristics of the watershed. In certain regions, where the availability of water depends on the catchment capacity of the watershed, the utilization of effective methods such as the hydric balance has become more frequently used because it enables an estimate of the hydrologic regime, the catchment capacity, and the water flows. It also enables an estimate of the hydrologic processes and the period in which they occurred. In the present work, assessments of the Climatic Hydric Balance (CHB and of potential evapotranspiration were performed in the Cazones river basin. The calculations followed the Thornthwaite and Mather method based on climatic variables such as temperature and precipitation during the period from 1981 to 2010. As a result of these assessments, it was found that the excess layer of water and the annual runoff were 638.63 mm and 637.02 mm, respectively. Further, the work identified the months that comprise the humid and dry periods, the regime of the climatic variables, and surpluses and deficits of water in the basin during an annual cycle.

  17. Stopover ecology of neotropical migrants in central Veracruz, México

    Science.gov (United States)

    Ernesto Ruelas Inzunza; Stephen W. Hoffman; Laurie J. Goodrich

    2005-01-01

    Available information on the ecology of neotropical migrants during the winter season and especially during migration is far behind the existing knowledge of birds during the breeding season. This paper presents a stopover ecology case study. We document the occurrence of species, outline the prevailing weather patterns during spring and fall migration seasons, and...

  18. Genetic diversity of drug and multidrug-resistant Mycobacterium tuberculosis circulating in Veracruz, Mexico

    Science.gov (United States)

    Munro-Rojas, Daniela; Fernandez-Morales, Esdras; Zarrabal-Meza, José; Martínez-Cazares, Ma. Teresa; Parissi-Crivelli, Aurora; Fuentes-Domínguez, Javier; Séraphin, Marie Nancy; Lauzardo, Michael; González-y-Merchand, Jorge Alberto; Rivera-Gutierrez, Sandra

    2018-01-01

    Background Mexico is one of the most important contributors of drug and multidrug-resistant tuberculosis in Latin America; however, knowledge of the genetic diversity of drug-resistant tuberculosis isolates is limited. Methods In this study, the genetic structure of 112 Mycobacterium tuberculosis strains from the southeastern Mexico was determined by spoligotyping and 24-loci MIRU-VNTRs. Findings The results show eight major lineages, the most of which was T1 (24%), followed by LAM (16%) and H (15%). A total of 29 (25%) isolates were identified as orphan. The most abundant SITs were SIT53/T1 and SIT42/LAM9 with 10 isolates each and SIT50/H3 with eight isolates. Fifty-two spoligotype patterns, twenty-seven clusters and ten clonal complexes were observed, demonstrating an important genetic diversity of drug and multidrug-resistant tuberculosis isolates in circulation and transmission level of these aggravated forms of tuberculosis. Being defined as orphan or as part of an orphan cluster, was a risk factor for multidrug resistant-tuberculosis (OR 2.5, IC 1.05–5.86 and OR 3.3, IC 1–11.03, respectively). Multiple correspondence analyses showed association of some clusters and SITs with specific geographical locations. Conclusions Our study provides one of the most detailed description of the genetic structure of drug and multidrug-resistant tuberculosis strains in southeast Mexico, establishing for the first time a baseline of the genotypes observed in resistant isolates circulating, however further studies are required to better elucidate the genetic structure of tuberculosis in region and the factors that could be participating in their dispersion. PMID:29543819

  19. Circulaciones culturales. Lo afrocaribeño entre Cartagena, Veracruz, y La Habana

    OpenAIRE

    Ávila Domínguez , Freddy; Pérez Montfort , Ricardo; Rinaudo , Christian

    2011-01-01

    International audience; Este libro es el fruto de un trabajo colectivo llevado a cabo en el marcodel programa internacional de investigación Afrodesc-Afrodescendientesy esclavitudes: dominación, identificación y herencias en las Américas (siglosxv-xxi). Es el resultado de una reflexión realizada por sus integrantesjunto con otros investigadores que han trabajado sobre el tema “afro”y contribuido al conocimiento de diversas áreas y temáticas en materiade estudios culturales de afrodescendiente...

  20. Radiological protection equipment of the OEP as additional knowledge in higher secondary education in Veracruz

    International Nuclear Information System (INIS)

    Castillo R, M. A.; Arias H, G. O.; Rojas A, O.; Zuniga R, L.

    2016-09-01

    The following work then develops information on radiological safety designed for occupationally exposed personnel (OEP) in areas with radioactivity, with the aim of providing pertinent information to students who attend the sixth semester of Higher Secondary Education to contribute to the formation of generic competence s GC1, GC4 and GC5, as well as in the basic disciplinary competence s of the experimental sciences area, particularly the DCE1, DCE4, DCE6, DCE12 and DCE14 to strengthen the skills required in the profile of graduates established in the Common Curricular Framework of the National System of High School according to the agreement number 444. Is intended to provide useful material for teachers to enable them to enrich their activities in the classroom, so that it helps the students to have a better notion and connection with the workplace, involving the management of nuclear energy and disseminate a safety culture that they can apply in their future life in case they even require it. (Author)

  1. First report of Armillaria root disease caused by Armillaria tabescens on Araucaria araucana in Veracruz, Mexico

    Science.gov (United States)

    M.-S. Kim; N. B. Klopfenstein; J. W. Hanna; P. Cannon; R. Medel; A. Lopez

    2010-01-01

    In September 2007, bark samples were collected from the root collar of a single Araucaria araucana tree that had recently died and was suspected of being killed by Armillaria root disease. Disease symptoms and signs included a thinning crown and fruiting bodies at the tree base over a several-year period before tree death.

  2. An analysis of two indigenous reproductive health illnesses in a Nahua community in Veracruz, Mexico

    Directory of Open Access Journals (Sweden)

    Smith-Oka Vania

    2012-08-01

    Full Text Available Abstract Background This article describes the local concepts indigenous Nahua women hold regarding their reproduction. Specifically it provides a description of two indigenous illnesses—isihuayo and necaxantle, it discusses their etiology, symptoms, and treatments, and it analyzes them within the local ethnomedical framework and sociopolitical context. A perception of female vulnerability is shown to be an underlying shaper of women’s experiences of these illnesses. Methods This research took place in a small Nahua village in Mexico. Qualitative data on local perceptions of these illnesses were collected by a combination of participant observation and interviews. Ethnobotanical data was obtained through interviews, and medicinal plants were collected in home gardens, fields, stream banks, and forested areas. The total study population consisted of traditional birth attendants (N = 5, clinicians (N = 8, and laywomen (N = 48. Results Results showed that 20% of the village women had suffered from one or both of these illnesses. The article includes a detailed description of the etiology, symptoms, and treatments of these illnesses. Data shows that they were caused by mechanical, physical, and social factors related to a woman’s weakness and/or lack of support. Traditional birth attendants often treated women’s illnesses. Five medicinal plants were salient in the treatment of these illnesses: Ocimum basilicum L., Mentzelia aspera L., Pedilanthus tithymaloides (L. Poit., and Piper umbellatum L. were used for isihuayo, while Solanum wendlandii Hook f. was used for necaxantle. Conclusions The research on these two ethnomedical conditions is a useful case study to understanding how indigenous women experience reproductive health. Reproductive health is not simply about clinically-based medicine but is also about how biomedicine intersects with the local bodily concepts. By describing and analyzing indigenous women’s ill health, one can focus upon the combination of causes—which extend beyond the physical body and into the larger structure that the women exist in.

  3. Current situation of spent fuel management in the Laguna Verde Nuclear Power Plant, Veracruz, Mexico

    International Nuclear Information System (INIS)

    Moreno, C.V.

    1994-01-01

    The Comision Federal de Electricidad (CFE), owner and operator of the Laguna Verde nuclear power plant (2 x 654 MWe BWR), has twice decided to increase the storage capacity of the spent fuel pools of the reactors. The Comision Nacional de Seguridad Nuclear y Salvaguardias (CNSNS), the national nuclear regulatory authority, approved the increase by a factor of 2.66 in the storage capacity proposal by CFE in 1989. Each reactor spent fuel pool can now hold 614 t HM. The reracking was done at a cost of about US $13 per kg U, which will add only 0.042 mills per kWh to the fuel cycle cost. (author)

  4. Epidemiological assessment of intestinal parasitic infections in dogs at animal shelter in Veracruz, Mexico

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    Cosme Alvarado-Esquivel

    2015-01-01

    Conclusions: A high prevalence of intestinal parasites was found in the dogs studied. This suggests that the environment is highly contaminated with intestinal parasites. Preventive and therapeutic measures should be taken against infection with intestinal parasites in dogs in this region.

  5. Dynamics of State-Society relationship in education in Veracruz, Mexico

    Directory of Open Access Journals (Sweden)

    Felipe Hevia

    2017-01-01

    Full Text Available There is interest in analyzing participation in Mexico. Through the case study of education, the objective is to analyze different patterns of relationship between society and State beyond institutional devices. The methodology is mixed: we applied focus groups and interviews, a questionnaire to school boards (N = 127 was applied, databases petitions to the authorities (N = 2783 and newspaper notes (N = 1326 were built. The results describe three dynamics of relationship between society and State: 1 regulated participation, which is expressed in the performance of the School Councils of Social Participation, 2 particularistic relations, which are based on finding a direct relationship between citizen-authority through petitions and applications, and 3 contentious-disruptive relationships characterized by protest actions. The effects of these dynamics are discussed, in terms of reproducing the asymmetries of power and building differentiated response capabilities by the government, and a research agenda is proposed.

  6. Presence and uses of wild grapevine (Vitis spp. in the central region of Veracruz in Mexico

    Directory of Open Access Journals (Sweden)

    Juan Guillermo Cruz-Castillo

    2009-06-01

    Significance and impact of study: The exploration of Vitis spp. in the area studied raises the possibility of finding new hybrids or multi-hybrids between species. Wild grapevines could be used to produce natural products that could be sold on the market.

  7. CAMBIOS EN LA FLORA BÉNTICA DE ARRECIFE HORNOS (VERACRUZ, MÉXICO

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    José Luis Godínez-Ortega

    2009-01-01

    Full Text Available El Arrecife Hornos pertenece al Sistema Arrecifal Veracruzano y por su accesibilidad a la costa ha sufrido el impacto antropogénico directo causando cambios en su biodiversidad. El objetivo del presente estudio fue conocer la composición y estructura florística, además de verificar los posibles cambios florísticos que han ocurrido en el área desde el último estudio en 1962. Los muestreos fueron realizados en las épocas de secas y lluvias (abril, 2008 y junio, 2008, respectivamente. La atribución de flora presente para 5 formas de vida (pastos marinos + epífitas, calcificadas/costrosas, filamentosas, tubulares/ laminares, racemosas/carnosas fue realizada con base en el análisis de la cobertura vegetal muestreada en 50 m2. Al comparar las especies del presente estudio con las especies reportadas en la literatura previamente se observó que de las 58 especies, 25 son nuevos reportes para Arrecife Hornos. La flora en 2008 fue pobre en comparación con las reportadas en 1962 (27 especies comparadas con las 58 especies. La flora de 1962 tenía un índice de Cheney de 3.5 que indica una flora mixta con elementos tropicales y subtropicales, sin embargo, para el presente estudio observamos un índice de 25 lo cual indica una flora tropical sin elementos subtropicales. Diversas especies de Sargassum hystrix var. buxifolium y S. polyceratium, comunes en 1962 han desparecido de Arrecife Hornos y especies con afinidad a aguas tropicales como Caulerpa racemosa y C. sertularioides están ahora presentes. Los valores de cobertura nos demuestran que Arrecife Hornos está cubierto en su mayoría por Thalassia testudinum y algas calcificadas (Lithophyllum aff. congestum y en menor proporción algas filamentosas, laminares y racemosas. El presente estudio sugiere la existencia de cambios en la composición y cobertura fitobentónica de Arrecife Hornos.

  8. Laboratory assessment of the workable range of soils in the tropical zone of Veracruz, Mexico

    NARCIS (Netherlands)

    Hoogmoed, W.B.; Cadena Zapata, M.; Perdok, U.D.

    2003-01-01

    Information on workability limits is highly valuable at the farm level to help the farmer in deciding when and possibly how to carry out tillage. On higher levels (e.g. on regional scale) this knowledge will form a basis for obtaining guidelines with respect to required number of tractors, equipment

  9. Color green for dollars: constraints and limitations for establising Chamaedorea palm firms in Veracruz, Mexico

    NARCIS (Netherlands)

    Musalem Castillejos, N.

    2014-01-01

    Interest in Non-Timber Forest Products (NTFPs) has grown with increasing awareness of tropical forest deforestation and amplified recognition for the need to add value to forest resources. However, NTFPs continue to be regarded by many as marginal goods incapable of competing with timber as a viable

  10. Lava tubes and aquifer vulnerability in the upper Actopan River basin, Veracruz, México

    Science.gov (United States)

    Espinasa-Pereña, R.; Delgado Granados, H.

    2011-12-01

    Rapid infiltration leads to very dry conditions on the surface of some volcanic terrains, with large allogenic streams sometimes sinking underground upon reaching a lava flow. Aquifers in lava flows tend to be heterogeneous and discontinuous, generally unconfined and fissured, and have high transmissivity. Springs associated with basalts may be very large but are typically restricted to lava-flow margins. Concern has been expressed regarding the potential for lava-tube caves to facilitate groundwater contamination similar to that afflicting some karst aquifers (Kempe et al., 2003; Kiernan et al., 2002; Halliday 2003). The upper Actopan River basin is a series of narrow valleys excavated in Tertiary volcanic brechias. Several extensive Holocene basaltic tube-fed lava flows have partially filled these valleys. The youngest and longest flow originates at El Volcancillo, a 780 ybP monogenetic volcano. It is over 50 km long, and was fed through a major master tube, the remains of which form several lava-tube caves (Gassos and Espinasa-Pereña, 2008). Another tube-fed flow initiates at a vent at the bottom of Barranca Huichila and can be followed for 7 km to where it is covered by the Volcancillo flow. The Huichila River is captured by this system of lava tubes and can be followed through several underground sections. In dry weather the stream disappears at a sump in one of these caves, although during hurricanes it overflows the tube, floods the Tengonapa plain, and finally sinks through a series of skylights into the master tube of the Volcancillo flow. Near villages, the cave entrances are used as trash dumps, which are mobilized during floods. These include household garbage, organic materials associated with agriculture and even medical supplies. This is a relatively recent phenomenon, caused by population growth and the building of houses above the lava flows. The water resurges at El Descabezadero, gushing from fractures in the lava above the underlying brechias, giving birth to the Actopan River. The water is so clear that people assume that it is pure and has been naturally filtered.

  11. A quantitative analysis of forest fragmentation in Los Tuxtlas, southeast Mexico: patterns and implications for conservation Un análisis cuantitativo de la fragmentación de la selva de Los Tuxtlas en el sudeste de México: patrones e implicaciones para la conservación

    Directory of Open Access Journals (Sweden)

    EDUARDO MENDOZA

    2005-09-01

    Full Text Available Habitat loss is a critical threat to tropical biodiversity and its quantification constitutes a central conservation issue. Typically, assessments have been based on deforestation rates statistics. However, this overlooks the effects brought about by the spatial reconfiguration of the remaining habitat: fragmentation. We present an analysis of fragmentation in a Neotropical site aimed at: (a devising a protocol for its quantification, (b using such protocol to provide insights on the ecological consequences of fragmentation, (c exploring its applicability to address the hypothesis that forest size-inequality decreases with elevation, an indicator of habitat accessibility. We applied the Gini coefficient (G and the Lorenz curve to analyze fragment-size variation using a satellite-generated map. We also estimated edge effect, fragment shape and isolation. Remaining forest includes 1,005 fragments, ranging from 0.5 to 9.356 ha (median = 0.89. Size inequality was very high (G = 0.928, producing a flattened Lorenz curve. Forty percent of the fragments did not maintain an area free of a 30-m edge effect, and larger fragments showed a marked deviation from ideal circular forms. Eighty-four percent of the fragments lay further than 500 m from the largest forest tract and their size decreased with distance. Fragment size distribution changed with altitude: the Gini coefficient was lowest and forest coverage was greatest at the highest altitude, but inequality peaked at an intermediate elevation. Given the current pace of habitat deterioration, application of similar analyses may improve global assessments of tropical ecosystems and their perspectives for biodiversity conservationLa destrucción del hábitat es la principal amenaza para la biodiversidad tropical, por lo que su cuantificación constituye un aspecto central para la biología de la conservación. Usualmente, esta cuantificación se basa en el cálculo de las tasas de deforestación, ignorando los efectos derivados de la reconfiguración espacial del hábitat remanente postdeforestación: la fragmentación. Aquí presentamos un análisis de la fragmentación en un sitio Neotropical para: (a proponer un protocolo para su cuantificación; (b utilizar tal protocolo para explorar las consecuencias ecológicas de la fragmentación; y (c explorar su aplicación para evaluar la hipótesis de que la heterogeneidad de tamaños de los fragmentos disminuye con la elevación (indicativo de la accesibilidad del hábitat. Calculamos el coeficiente de Gini y la curva de Lorenz para analizar la desigualdad de tamaños de los fragmentos, utilizando un mapa generado con una imagen de satélite; además evaluamos el efecto de borde, la forma de los fragmentos y su grado de aislamiento. Encontramos que el bosque remanente incluye 1.005 fragmentos entre 0,5 y 9,356 ha (mediana = 0,89. La desigualdad de tamaños fue considerable (G= 0,928, con una curva de Lorenz muy abatida. El 40% de los fragmentos no tuvo un área libre de un efecto de borde de 30 m de ancho; los fragmentos más grandes mostraron un desvío considerable con respecto a la forma circular ideal. El 84 % de los fragmentos estuvo aislado, ubicándose más allá de 500 m de distancia del parche más grande de bosque y su tamaño disminuyó con la distancia. La distribución de tamaños de los fragmentos varió con la elevación: el coeficiente de Gini fue menor y la cobertura relativa de bosque fue mayor en la elevación más grande, pero la desigualdad fue máxima en una elevación intermedia. Proponemos que, en vista de los ritmos actuales de deterioro del hábitat, la aplicación de análisis similares puede mejorar nuestras evaluaciones del estado de conservación de los ecosistemas tropicales y las perspectivas para la conservación de la biodiversidad

  12. Relación biogeográfica entre cangrejos dulceacuícolas y acociles a lo largo de la zona mexicana de transición: revaluación de la hipótesis de Rodríguez (1986 Biogeographic relationship of freshwater crabs and crayfish along the Mexican transition zone: reevaluating Rodríguez (1986 hypothesis

    Directory of Open Access Journals (Sweden)

    Fernando Álvarez

    2012-12-01

    Full Text Available A partir de la hipótesis planteada por Rodríguez (1986 sobre una posible exclusión biogeográfica entre acociles de la familia Cambaridae y cangrejos de agua dulce de la familia Pseudothelphusidae a lo largo del centro y sur de México, se han hecho varios estudios que toman en cuenta este patrón. Sin embargo, no se han examinado los patrones de distribución de estos grupos ni cuáles son las zonas ni a qué grado se da el traslape o contacto de las 2 distribuciones. Se construyeron 2 bases de datos, una con más de 1 400 registros de las especies de la familia Cambaridae y otra con más de 400 registros de cangrejos de la familia Pseudothelphusidae. Se construyeron mapas de distribución y se identificaron 3 regiones donde el contacto es evidente: el eje neovolcánico, la región de Los Tuxtlas, Veracruz y el estado de Chiapas. Los resultados muestran grandes zonas de contacto en las cuales tanto acociles como cangrejos pueden estar en la misma localidad y en el mismo cuerpo de agua o pueden estar en 2 localidades muy cercanas pero con una diferencia altitudinal. En general, los acociles tienden a distribuirse a mayores altitudes que los cangrejos. Aunado a los patrones de distribución, se discute que aunque los 2 grupos estén presentes en la misma localidad y en el mismo cuerpo de agua, el microhábitat que ocupa cada uno es distinto, por lo que se sugiere que la interferencia entre ellos será poca o nula.After Rodríguez (1986 hypothesis on the possible biogeographic exclusion between crayfish of the family Cambaridae and freshwater crabs of the family Pseudothelphusidae throughout central and southern Mexico, several studies have considered it as a real pattern. However, the distribution patterns of both groups have not been examined, nor in what areas and to what extent the overlap of the 2 distributions occurs. Two data bases were compiled, one with more than 1 400 records of the species of the family Cambaridae and a second one

  13. Relative frequencies of deletereo genes in populations of droshopila Melanogaster from Laguna Verde, Veracruz; Frecuencias relativas de genes deletereos en poblaciones de Drosophila melanogaster originarias de Laguna Verde, Veracruz

    Energy Technology Data Exchange (ETDEWEB)

    Salceda, V. M. [ININ, 52750 La Marquesa, Estado de Mexico (Mexico)]. e-mail: vmss@nuclear.inin.mx

    2008-07-01

    In order to obtain data about the possible changes and/or damages that could cause the operation of the reactors of the nuclear power plant of Laguna Verde to the populations of drosophila Melanogaster that lives in the zone, one carried out one series of biannual collections (summer and winter) during the years 1991-1992 and 1996-1998 to obtain individuals of this species and to subject them to a battery of tests. The flies of this species that it was possible to capture were transported to the Biology Laboratory of the National Institute of Nuclear Research, where they were put under in individual form a series of you cross they allowed that us in the third generation to detect the presence of deletereo genes that following their viability were catalogued like normal, lethal or less lethal according to the methodology of Wallace. This way a total of 933 second chromosomes was analyzed to leave of them the relative frequencies were calculated of each one of the categories, for each sample station. The result of the applied statistical test indicates us that not significant difference exists among the populations and that the differences of having them must only to the environment changes something that usually happen in all the population. For what we can point out that the presence of the reactors does not seem to influence negatively in the behavior of the population that lives in the zone. (Author)

  14. Hábitos de estudio y rendimiento académico en enfermería, Poza Rica, Veracruz México / Study habits and academic performance in nursing, Poza Rica, Veracruz, Mexico

    Directory of Open Access Journals (Sweden)

    Fabiola Cruz Nuñez

    2011-12-01

    Full Text Available ResumenEl objetivo de la investigación fue determinar la relación que existe entre los hábitos de estudio y el rendimiento académico en los estudiantes de la Facultad de Enfermería Poza Rica-Tuxpan, a fin de proponer alternativas que permitan el incremento del rendimiento académico y personal del estudiante. El tipo y diseño de investigación fue descriptivo y correlacional. La población se constituyo por 397 estudiantes inscritos en el periodo febrero-agosto 2010. El tipo de muestreo fue probabilístico estratificado, 79 estudiantes conformaron la muestra, se aplicó el inventario de hábitos de estudio de Gilbert Wrenn y el rendimiento académico se considero como el promedio que obtuvieron en el semestre anterior. Como resultados se obtuvo que el 85% de estudiantes posean hábitos de estudio regulares y en el 15% son deficientes. Respecto al rendimiento académico en el 23% es excelente, en el 62% es de bueno a regular y solo en el 15% su promedio es bajo. Al correlacionar los hábitos de estudio con el rendimiento académico se observa correlación significativa entre ellos, por tanto se acepta la hipótesis de investigación correlacional y se rechaza la hipótesis nula. Estos resultados llevan a la reflexión de diseñar una estrategia metodológica para trabajar los hábitos de estudio desde el ingreso del estudiante a la universidad en aras de mejorar el rendimiento académico. AbstractThe research objective was to determine the relationship between study habits and academic performance among students in the School of Nursing Poza Rica-Tuxpan, to propose alternatives to the increased academic performance and student staff. The type and design was descriptive and correlational research. The population consisted of 397 students enrolled in the period February to August 2010. The sampling was stratified probability, 79 students formed the sample was applied to the inventory of Gilbert's study habits and academic performance Wrenn was considered as the average obtained in the previous semester. The result was that 85% of students hold regular study habits and 15% are poor. With regard to academic performance in 23% excellent, 62% are regular and good, and only in 15% of his average is low. By correlating the habits of academic study with significant correlation was seen between them, so accepts the correlational research hypotheses and rejecting the null hypothesis. These results lead to the thought of designing a methodological strategy to work the study habits of students from admission to college in order to improve academic performance.

  15. Radiological protection equipment of the OEP as additional knowledge in higher secondary education in Veracruz; Equipo de proteccion radiologica del POE como conocimiento adicional en la educacion media superior de Veracruz

    Energy Technology Data Exchange (ETDEWEB)

    Castillo R, M. A.; Arias H, G. O. [Universidad Veracruzana, Prol. Venustiano Carranza s/n, Revolucion, 93390 Poza Rica, Veracruz (Mexico); Rojas A, O.; Zuniga R, L., E-mail: mario1997_11@hotmail.com [Comision Nacional de Seguridad Nuclear y Salvaguardias, Dr. Barragan No. 779, Col. Narvarte, 03020 Ciudad de Mexico (Mexico)

    2016-09-15

    The following work then develops information on radiological safety designed for occupationally exposed personnel (OEP) in areas with radioactivity, with the aim of providing pertinent information to students who attend the sixth semester of Higher Secondary Education to contribute to the formation of generic competence s GC1, GC4 and GC5, as well as in the basic disciplinary competence s of the experimental sciences area, particularly the DCE1, DCE4, DCE6, DCE12 and DCE14 to strengthen the skills required in the profile of graduates established in the Common Curricular Framework of the National System of High School according to the agreement number 444. Is intended to provide useful material for teachers to enable them to enrich their activities in the classroom, so that it helps the students to have a better notion and connection with the workplace, involving the management of nuclear energy and disseminate a safety culture that they can apply in their future life in case they even require it. (Author)

  16. Dinámica espacio-temporal de nematodos gastrointestinales y escarabajos estercoleros en un agroecosistema bovino de Veracruz.

    OpenAIRE

    Flota Bañuelos, Carolina

    2012-01-01

    Se analizaron los componentes del agroecosistema bovino, con la inclusión de la ivermectina sobre la abundancia y la disposición espacio-temporal de escarabajos estercoleros y de nematodos gastrointestinales. El capítulo I presenta el estudio de los nematodos gastrointestinales que afectan a los bovinos, su abundancia, su dispersión en el potrero, y el efecto de la ivermectina sobre los huevecillos en las heces. Se encontró que los parásitos que afectan al ganado son Haemonchus contortus, Tri...

  17. Mejoramiento del Espacio Público en las Colonias Populares de México. Caso de Estudio de Xalapa-Veracruz

    Directory of Open Access Journals (Sweden)

    Mauricio Hernández Bonilla

    2005-01-01

    Full Text Available Dentro del estudio de la problemática urbana de las ciudadesmexicanas es necesario concentrarnos en la situación actualde los espacios públicos; tema poco explorado en nuestrocontexto a diferencia de otros ámbitos urbanos en el mundoen donde el tema ha sido objeto de gran atención. Esteartículo hace un acercamiento a los procesos de creación ytransformación del espacio público de la periferia popularmexicana. Intenta hacer evidente que el espacio público en losasentamientos periféricos es resultado de la apropiación quelos habitantes llevan a cabo sobre el territorio barrial con elfin de crear espacios públicos con calidad y permanencia.Primeramente se hace una revisión de la definición de espaciopúblico examinando su pertinencia con respecto al contextodel hábitat popular. Posteriormente el artículo analiza losprocesos de producción del espacio público explorando lasestrategias de protección, mejoramiento, gestión y finalmentede uso que los pobladores realizan con el fin de satisfacer susnecesidades de vida pública. Este artículo surge de unainvestigación cualitativa de corte etnográfico que involucraentrevistas y observaciones, y principalmente argumenta queel espacio público representa una gran importancia dentro delos procesos de integración y consolidación urbanaemprendidos por los sectores populares.

  18. Smallholder Livelihood Adaptation in the Context of Neoliberal Policy Reforms: A Case of Maize Farmers in Southern Veracruz, Mexico.

    NARCIS (Netherlands)

    Groenewald, S.F.; Berg, van den M.M.

    2012-01-01

    Governments around the world have embraced trade liberalisation as a means of enhancing efficiency to realise economic growth and alleviate poverty. Likewise, the Mexican government implemented neoliberal policy reforms, the NAFTA in particular, to stimulate sustainable development. Using the

  19. Isolation of Vibrio cholera El Tor Inaba From Lemna minor and Eichhornia crassipens Roots in Veracruz, Mexico

    OpenAIRE

    Cordoba Aguilar, Edgar; Herrera Rivero, Marisol; Rubi, Alberto; Arroyo-Helguera, Omar; Coutino Rodriguez, Rocio

    2014-01-01

    Background: During epidemic periods, the strain Vibrio cholera El Tor has been isolated from the aquatic macrophyte roots of Eichhornia crassipens and Lemna minor, suggesting that aquatic plants could be environmental reservoirs through either a non-specific association or a commensalism relationship. Therefore, it is important to understand V. cholera reservoirs in order to establish prevention strategies against this pathogen. Objectives: Our interest was to determine whether V. cholera cou...

  20. Isolation of Vibrio cholera El Tor Inaba From Lemna minor and Eichhornia crassipens Roots in Veracruz, Mexico

    Science.gov (United States)

    Cordoba Aguilar, Edgar; Herrera Rivero, Marisol; Rubi, Alberto; Arroyo-Helguera, Omar; Coutino Rodriguez, Rocio

    2014-01-01

    Background: During epidemic periods, the strain Vibrio cholera El Tor has been isolated from the aquatic macrophyte roots of Eichhornia crassipens and Lemna minor, suggesting that aquatic plants could be environmental reservoirs through either a non-specific association or a commensalism relationship. Therefore, it is important to understand V. cholera reservoirs in order to establish prevention strategies against this pathogen. Objectives: Our interest was to determine whether V. cholera could be isolated and typified from L. minor and E. crassipens roots. Materials and Methods: From 2004 to 2005, plants were collected from various ecological niches and the roots were used to isolate V. cholera. Standard bacteriological, biochemical and serological tests were used for its typification. Results: In five out of the nine ecological niches explored, we collected either L. minor or E. crassipens, as these specimens cohabited only in two niches. V. cholera was isolated from both L. minor and E. crassipens roots. The isolated V. cholera showed the same biochemical characteristics as the pure V. cholera strain which was used as a control. The isolated V. cholera corresponded to V. cholera O1 El Tor Inaba, which is the same serotype related to the last outbreak in Mexico. Conclusions: For first time V. cholera El Tor Inaba has been isolated several years after the last emergence of cholera in Mexico. A viable and cultivable V. cholera strain, sourced from freshwater niches in E. crassipens and L. minor roots, suggests the importance of these plants as a permanent aquatic reservoir for these organisms. The monitoring of E. crassipens and L. minor is the responsibility of health institutions in order to evaluate the ongoing risks. PMID:25147681

  1. The obsidian of the Maltrata valley, Veracruz, origin analysis of the raw material with neutron activation analysis

    International Nuclear Information System (INIS)

    Molina V, R. O.; Jimenez R, M.; Tenorio, D.; Lira L, Y.; Manzanilla, L.

    2009-01-01

    51 archaeological pieces of obsidian coming from the Maltrata valley were analyzed by means of the analysis technique by neutron activation, with the purpose of determining the interchange routes of that region. In accordance with the statistical study of the results, the obsidians of this investigation come from 5 deposits located in: Sierra de las Navajas, Pico de Orizaba, Zaragoza-Oyameles, Otumba and Paredon. The analyzed obsidian fragments were selected in accordance with their raw material type, size, weight, morphology, excavation context and surface. The irradiation of the samples was carried out in the research reactor TRIGA Mark III of the Nuclear Center of Mexico, with a neutrons flow of 1·10 13 n·cm -2 ·s -1 . (Author)

  2. Mortalidad en un área indígena de Veracruz. Enfermedades transmisibles y no transmisibles

    Directory of Open Access Journals (Sweden)

    Elda MONTERO-MENDOZA

    2011-01-01

    municipios con el objetivo de obtener información sociodemográfi ca e indicadores económicos y de salud. A partir de los resultados se discuten dos aspectos: las principales causas de mortalidad en los hombres y en las mujeres de los cuatro municipios, y la importancia del certifi cado de defunción como fuente primaria de las estadísticas de mortalidad.

  3. Isolation of Vibrio cholera El Tor Inaba From Lemna minor and Eichhornia crassipens Roots in Veracruz, Mexico.

    Science.gov (United States)

    Cordoba Aguilar, Edgar; Herrera Rivero, Marisol; Rubi, Alberto; Arroyo-Helguera, Omar; Coutino Rodriguez, Rocio

    2014-03-01

    During epidemic periods, the strain Vibrio cholera El Tor has been isolated from the aquatic macrophyte roots of Eichhornia crassipens and Lemna minor, suggesting that aquatic plants could be environmental reservoirs through either a non-specific association or a commensalism relationship. Therefore, it is important to understand V. cholera reservoirs in order to establish prevention strategies against this pathogen. Our interest was to determine whether V. cholera could be isolated and typified from L. minor and E. crassipens roots. From 2004 to 2005, plants were collected from various ecological niches and the roots were used to isolate V. cholera. Standard bacteriological, biochemical and serological tests were used for its typification. In five out of the nine ecological niches explored, we collected either L. minor or E. crassipens, as these specimens cohabited only in two niches. V. cholera was isolated from both L. minor and E. crassipens roots. The isolated V. cholera showed the same biochemical characteristics as the pure V. cholera strain which was used as a control. The isolated V. cholera corresponded to V. cholera O1 El Tor Inaba, which is the same serotype related to the last outbreak in Mexico. For first time V. cholera El Tor Inaba has been isolated several years after the last emergence of cholera in Mexico. A viable and cultivable V. cholera strain, sourced from freshwater niches in E. crassipens and L. minor roots, suggests the importance of these plants as a permanent aquatic reservoir for these organisms. The monitoring of E. crassipens and L. minor is the responsibility of health institutions in order to evaluate the ongoing risks.

  4. Ethnobotanic study of Randia aculeata (Rubiaceae in Jamapa, Veracruz, Mexico, and its anti-snake venom effects on mouse tissue

    Directory of Open Access Journals (Sweden)

    CA Gallardo-Casas

    2012-01-01

    Full Text Available In Mexico, medicinal plants are widely used. The use of Randia aculeata by healers against snakebites has never been scientifically tested in relation to possible effects on blood parameters and muscle tissue damage. Interviews were carried out in Jamapa, Veracuz, Mexico, with local residents to collect information about the traditional use of Randia aculeata. In this locality, seven pieces of fruit from the plant are mixed in a liter of alcohol, and then administered orally against snakebites. By using histological techniques and a murine model, we explored its cytoprotective properties against the effects of Crotalus simus and Bothrops asper venoms. Possible protections provided by the plant against tissue damage to skeletal and cardiac muscles and against the typical loss of red blood cells were analyzed. Randia aculeata caused an increase in microhematocrit and total hemoglobin, parameters that are often decremented in association with the loss of red blood cells, which is a characteristic effect of animal venom. Randia aculeata was also shown to protect against the lowering of platelet levels caused by Bothrops asper venom. Finally, Randia aculeata produced a partial inhibition of necrosis following administration of snake venom in skeletal and myocardial muscles. The present results provide solid evidence for the traditional use of Randia aculeata against snakebites, as demonstrated by protection against muscular tissue damage and the diminution of red blood cells.

  5. PLANEACIÓN DE UN SISTEMA SILVOPASTORIL EN LADERA EN HUATUSCO, VERACRUZ APLICANDO EL MÉTODO NEZAHUALCÓYOTL

    Directory of Open Access Journals (Sweden)

    L. Quinto

    2009-01-01

    Full Text Available El estudio describe el diseño e implementación de un módulo silvopastoril en ladera aplicando el método Nezahualcóyotl para establecer el componente arbóreo compuesto por: Swietenia macrophylla King (caoba, Tabebuia rosea (Bertol DC. (roble y Cedrela odorata L. (cedro rojo. El terreno se ubicó en la zona de Huatusco; en él se construyeron a nivel cinco bordos-zanjas, sobre los bordos se plantaron cada 4 m e intercalados, los árboles con dos meses de crecimiento en vivero. A cuatro meses de la plantación la supervivencia fue similar (a=0.05 entre especies y superior a 80 %. El componente ganadero no se implementó en campo sólo se describió su diseño y planeación, este componente consistió de pradera de Brachiaria brizantha y bovinos a media ceba. Se describe el establecimiento de la pradera mediante cultivo de maíz en aparcería. Se identifican los principales rubros de egresos para el establecimiento del módulo silvopastoril aplicando el método Nezahualcóyotl estimando como costo $ 44,347.00 por cada tercio de hectárea. Se concluyó que el método Nezahualcóyotl es una opción para el establecimiento del componente arbóreo de un sistema silvopastoril en terrenos con pendiente.

  6. tosedores crónicos indígenas de la Sierra Santa Marta, Veracruz, México

    Directory of Open Access Journals (Sweden)

    Elda Montero Mendoza

    2007-01-01

    Full Text Available La tuberculosis pulmonar como causa de enfermedad y muerte es un importante problema de salud pública, debido a que un gran número de personas que desarrollan tuberculosis no tienen oportunidad del diagnóstico y tratamiento oportunos. El objetivo de este estudio fue explorar la colaboración de la población tosedora para seguir el procedimiento diagnóstico establecido por la Norma Oficial Mexicana para la Prevención y Control de la Tuberculosis en la atención primaria a la salud (NOM en poblaciones indígenas, en un contexto de elevada prevalencia de tuberculosis pulmonar, pobreza y ausencia de servicios locales de salud. Se estimó la prevalencia de tos crónica y se realizó análisis multivariado usando un modelo de regresión logística lineal para identificar algunos factores explicativos del número de muestras de expectoración entregadas. Se discuten las dificultades para establecer el diagnóstico de tuberculosis pulmonar en población indígena y se propone la necesidad de replantear las estrategias de búsqueda y diagnóstico en poblaciones de alto riesgo como la considerada en este estudio.

  7. Obesidad y riesgo de síndrome metabólico en estudiantes de posgrado de Veracruz, México

    Directory of Open Access Journals (Sweden)

    Martha Gabriela Campos-Mondragón

    2016-01-01

    Full Text Available Introducción: Debido a que la salud de los estudiantes influye en su rendimiento académico y eficiencia terminal, y la obesidad aumenta en los adultos, se planteó analizar las variables antropométricas y ambientales asociadas al riesgo de síndrome metabólico en estudiantes de posgrado.Material y Métodos: Estudio transversal en 52 estudiantes mediante muestreo intencional no probabilístico. Se evaluaron peso, estatura e índice de masa corporal. Según la circunferencia de cintura, relación cintura-cadera y grasa corporal, se identificó el riesgo de síndrome metabólico. Se registraron antecedentes familiares, personales, peso al nacer, ingesta semanal de alimentos, alcohol, tabaco y café, nivel de actividad física, depresión y estrés. Se analizaron diferencias entre medias, correlaciones y modelos de regresión lineal.Resultados: El peso (74,8±13,9; p=0,0024, la circunferencia de cintura (87,6±9,0; p=0,0044 y la relación cintura-cadera (0,9±0,0; p=0,0000 fueron superiores en los hombres y la grasa corporal en las mujeres (35,4±4,5; p=0,0000. Según la circunferencia de cintura y la grasa corporal, el 34% y el 87% respectivamente mostraron riesgo de síndrome metabólico, en su mayoría mujeres. El modelo de regresión lineal para grasa corporal incluyó sexo (b=9,5; p=0,0000 y estrés leve (b=4,7; p=0,0410. El modelo para índice de masa corporal incluyó circunferencia de cadera, circunferencia de cintura, depresión y estrés severo (b=1,61; p=0,0486. Más del 50% mostraron un consumo nulo de leche, nueces y leguminosas.Conclusiones: Las variables asociadas a los indicadores de mayor riesgo de síndrome metabólico fueron el sexo y el estrés. Se evidenciaron hábitos de alimentación deficientes.

  8. Posible presencia de maíz transgénico en Veracruz, México: marco regulatorio y conocimiento de productores y consumidores.

    OpenAIRE

    Rojas Cruz, Araceli

    2010-01-01

    En un país megadiverso como México, reconocido como centro de origen, domesticación y diversificación del maíz, existe un debate amplio sobre los efectos difíciles de predecir o inesperados por la liberación ambiental de animales o plantas transgénicas. Los riesgos de la contaminación con transgénicos son particularmente altos en un país como México donde el maíz lleva siglos como base de la alimentación en los agroecosistemas milpa y tiene un valor cultural. Los puertos comerciales de Veracr...

  9. Distribución de materia seca y nutrimentos en árboles de limón 'persa' (citrus latifolia tan. en Veracruz, México

    Directory of Open Access Journals (Sweden)

    E. Contreras-Morales

    2007-01-01

    Full Text Available El presente estudio se llevó a cabo en dos huertas de limón 'Persa' cada una en diferente tipo de suelo, con la finalidad de conocer la distribución de materia seca y nutrimentos en los órganos de cítricos y determinar su estado nutrimental. La huerta 1 de 12 años de edad estaba creciendo en suelo arcillo-migajón arenoso y la huerta 2, de 9 años de edad, en suelo arcilloso. El método de estudio consistió en extraer completamente cuatro árboles por huerta y fraccionarlos en sus diferentes órganos: hoja, flor, fruto, ramas, tronco y raíces. Las variables determinadas fueron: peso fresco y peso seco de cada órgano. Se determinó la concentración de nutrimentos por análisis químicos: N, P, K, Ca, Mg, B, Cu, Fe, Mn y Zn. Los datos de ambas huertas fueron sometidos a análisis de varianza y prueba de comparación de medias por separado. Las raíces fibrosas (< 1 mm de diámetro para ambas huertas presentaron concentraciones altas de micronutrimentos destacando Fe y Mn. Para ambas huertas los nutrimentos extraídos en mayor cantidad por el fruto fueron K y Ca; y en menor cantidad Zn y Cu. Con relación a la distribución de biomasa, el tronco y ramas aportaron el 60.32 %; el conjunto de raíces el 26.93 % y las hojas el 9.41 % de la materia seca total del árbol, mientras que el N en hojas representó el 17.5 % del total de la planta, en la huerta1. Esto representó 1.85 veces más de nitrógeno, con relación al peso seco de las hojas. Datos similares se tuvieron en la huerta 2. Para ambas huertas el Cu y el N fueron los nutrimentos más requeridos.

  10. Experiencias en el establecimiento de Arachis pintoi Krapov & W.C. Greg. como cobertura en cítricos de Veracruz, México

    Directory of Open Access Journals (Sweden)

    B. Valles

    2006-01-01

    Full Text Available Se realizaron dos experimentos para evaluar el establecimiento de Arachis pintoi (Ap como cobertera en cítricos; el primero, en limón Persa, y el segundo, en naranjo. En el primero se sembraron los ecotipos CIAT 17434, 18744 y 18748 en suelo rastreado, en surcos separados a un metro, y distancia de 50 cm entre plantas. En el segundo, se sembró Ap 17434 en suelo rastreado, escardado, u hoyado; plantando a 50 y 35 cm en surcos separados a 75 cm, con y sin P+K+Mg. La cobertura se evaluó a 4, 8, 12, 16, 20 y 24 semanas postsiembra, con la misma frecuencia en el segundo caso hasta 20 semanas. El diseño experimental fue para el primero completamente al azar; y el segundo, de bloques al azar, en parcelas subdivididas. Del primero, resultó que las semanas para alcanzar 50% y 100% de cobertura fueron 16 y 32, 12 y 24, y 13 y 26, para 17434, 18744 y 18748, respectivamente (P=0.0001. Para el segundo caso, los máximos valores de cobertura fueron en suelo rastreado, en rango de 53.5 a 87.5 %, según la densidad de siembra y fertilización. En los restantes tratamientos los valores fueron pobres (3.5 % a 33.7%. Del primer experimento, los ecotipos 18744 y 18748 se consideraron como los más promisorios en cuanto al tiempo necesario para cubrir totalmente el terreno. Para el segundo experimento, la preparación del terreno con pases de rastra garantizó el mejor establecimiento de la cobertura.

  11. Analysis of flooding in urban areas, taking into account the residence time of the water on site case of study: Veracruz, México

    Directory of Open Access Journals (Sweden)

    Faustino De Luna C

    2016-01-01

    To estimate the damage, shall take into account the hydrodynamic behaviour of the flows. Since houses remain flooded for several days, was the reason to use precipitation level for more than seven days. in the mathematical modelling of flows water with a regular grid made up of cells 10 m by side with the boundary condition downstream, corresponding to the predicted change in the average sea level.

  12. Diagnóstico y tipificación de unidades familiares con y sin gallinas de traspatio en una comunidad de Huatusco, Veracruz (México

    Directory of Open Access Journals (Sweden)

    Manuel Sánchez-Sánchez

    2014-01-01

    Full Text Available De un censo de 78 unidades familiares que conforman la comunidad de estudio, se obtuvo información de 38; éstos, cuentan con gallinas cuyo personal es responsable de: las aves, del estado de las instalaciones y equipo de trabajo, de conformación de la parvada, de técnicas de manejo, datos productivos y económicos, y de perspectivas de producción; asimismo, información de 30 familias sobre motivos para no dedicarse a dicha actividad. Mediante análisis de conglomerados fueron determinados tres tipos de unidades familiares con gallinas: productores con fin comercial (PFC, caracterizados por tener gallinas criollas para venta de carne y huevo, y tener planes de crecimiento de la parvada; productores para autoconsumo con venta de excedentes (PAV, que se distinguen por criar gallinas de raza comercial, y contar con mayor área de gallinero e implementos; y productores sólo para autoconsumo (PAC, que poseen gallinas de raza comercial, criadas en completa libertad en el traspatio y cafetales. Además de dos tipos de unidades sin gallinas: ex productores (EX, aquellos que han abandonado la actividad, principalmente por falta de espacio y por pérdida del interés; y familias que nunca han tenido gallinas (SN, principalmente porque les desagrada la cría de aves. Se concluye que, aproximadamente, la mitad de las familias están interesadas en las gallinas de traspatio, distinguiéndose tres tipos de productores, todos con instalaciones rústicas y manejo deficiente, especialmente en el cuidado de la salud de las aves; no obstante, otras familias de la comunidad también resultan beneficiadas por la producción excedente de aquéllas.

  13. Interactions between the Laramide Foreland and the passive margin of the Gulf of Mexico: Tectonics and sedimentation in the Golden Lane area, Veracruz State, Mexico

    NARCIS (Netherlands)

    Alzaga-Ruiz, H.; Lopez, M.; Roure, F.; Séranne, M.

    2009-01-01

    This paper focuses on the analyses of the clastic sedimentary infill of the Coastal Plain of Eastern Mexico, which initiated synchronously with the Laramide orogeny in the vicinity of the Golden Lane. Results of these analyses are used as boundary conditions for calibrating/interpreting seismic

  14. Patrón espacio-temporal de larvas y huevecillos de nemátodos gastrointestinales en pastizales ganaderos de Veracruz, México

    Directory of Open Access Journals (Sweden)

    Carolina Flota-Bañuelos

    2013-12-01

    Full Text Available El conocer la disposición espacio-temporal y diseminación de las larvas de nematodos gastrointestinales en los pastizales, y estimar el efecto de la ivermectina aplicada a bovinos sobre la abundancia de sus huevecillos, permite estimar dónde y cuándo se presentan las poblaciones más altas, que puede servir para establecer planes de muestreo y orientar medidas de control, así como para definir el riesgo de contaminación de los pastizales de manera diferencial. Para la determinación de la disposición espacio-temporal de L3 en el pastizal, se recolectaron, contaron e identificaron mensualmente las larvas en 30 puntos de muestreo, posteriormente se generaron mapas de disposición espacial con los datos obtenidos de los conteos de L3 en cada punto y mes de muestreo, y se calculó el patrón de disposición mediante los índices varianza/media y K binomial negativa. El número de huevecillos por gramo de heces de los bovinos con (CI y sin ivermectina (SI, se calculó con la técnica de McMaster. En el pastizal se recuperaron 20 276L3, correspondiendo el 80% a H contortus. En octubre 2008 se detectó la más alta densidad de nematodos con más de 5 000L3/kgMS. Las L3 presentaron un patrón espacial agregado de intensidad variable durante todo el año. Las mayores densidades poblacionales de nematodos fueron en octubre 2008 y las menores en febrero y marzo 2009. La aplicación de ivermectina a los bovinos no redujo el número de huevecillos presentes en las heces, debido a que los tratamientos fueron estadísticamente iguales. De julio a noviembre 2008, se observaron las mayores cargas parasitarias.

  15. Estimating volume of deposits associated with landslides on volcanic landscapes in the SW flank of the volcano Pico de Orizaba, Puebla-Veracruz

    Directory of Open Access Journals (Sweden)

    Gabriel Legorreta Paulín

    2017-03-01

    Full Text Available Landslides that occur along river systems are very common and have the potential to cause harm to human, to its infrastructure or affect their socio-economic activity. This dynamic is magnified in territories where morphological contrasts are very marked; as in the border between the mountains and subhorizontal land. This is especially true for volcanic terrains where volcanic activity can trigger voluminous landslides along stream systems by sector and flank collapse and where high seasonal rainfall on terrains covered by poorly consolidated materials produces small but hazardous landslides and debris flows that occur continually along stream systems during the volcanic repose periods. Those type of landslides can deliver volumes of hundreds and millions cubic meters that create a potentially hazardous situation for people and property down the valleys. The study of landslides in volcanic terrains through a Geographic Information System (GIS and under a geomorphological criterion, have allowed to develop a comprehensive methodology linked to the development of multi-temporal inventory, with susceptibility and volume estimation of displaced material. The aim of this research is to develop a method (protocol for landslide susceptibility and landslide volume assessment of potentially unstable volcanic landscapes in order to be helpful in mitigating landslide damages to human settlements. Pico de Orizaba volcano is the highest volcano in Mexico. The volcano has been affected by large flank collapse landslides throughout its geological history. These events have partially destroyed the cone as it happened in Bezymianny volcano and St. Elena volcano. In this volcano, the risk associated with landslide and debris flows, is increased by the growing of human settlements along the hillslopes and by the subsistence agriculture, and deforestation. This situation is favored by a volcanic calm that has lasted 147 years, approximate. These conditions create a dangerous situation for more than 360 000 people living on the southern flank of the volcano Pico de Orizaba, where landslides along the hillslopes and the river system threaten towns like Cordova, Orizaba, Rio Blanco, Nogales and Ciudad Mendoza. Today the most common and dangerous landslides are associated with unconsolidated volcanic deposits and heavy seasonal rains. In this paper, the cause, distribution, and link between landslides and the volcanic landscape relief susceptibility are analyzed. Similarly, the volume of displaced material is estimated in order to characterize the landslide instability in volcanic terrains. The Río El Estado watershed on the southwestern flank of Pico de Orizaba volcano is selected to describe and analyze susceptible areas of gravitational processes. The study area allows to show a systematic methodology for landslide mapping and volume calculation in areas with scarce information. The methodology encompasses three main stages of analysis. In the first stage, background information is collected to provide context and establish a generalized characterization of landslide processes, landsforms and volumes within the study area. Background information includes the following maps: topographic, geologic, land use, climate, slope, slope curvature, contributing area, flow direction, saturation, reclassified hypsomety, reclassified slope, and morphography. By retrieval and on-off switching of the background information in the GIS, a base map is created to assist in the digitizing of landslides. The base map and the theoretical aspects of the geomorphological mapping help to develop a conceptual base of support for mapping landslides. Landslides are digitized directly into a geographic information system (GIS, and in parallel, a spatial geodatabase of landslides attributes (eg. size, volume, activity, landslide type, etc. is constructed. Previous landslide mapping in the study area is verified and new landslides are added to the landslide inventory. Once the locations of landslides are mapped and evaluated, similar potential landslide areas are grouped into individual landforms. During the second stage, the volcanic relief is analyzed under a geomorphological criterion based on aerial photographs, fieldwork, and detailed mapping and the results are adjusted to the landslide hazard zonation protocol from Washington State, Department of Natural Resources, USA. For each volcanic landform a semi-quantitative susceptibility rating is obtained from values that correspond to the total area of landslides and the number of landslides within each landform; and they are normalized for the total period of time spanned between sets of aerial orthophotographs (fourteen years period. These normalized variables are referred to as the landslide area rate and the landslide frequency rate, respectively.  Finally, for the third stage, the volume of material delivered by landslides to the main river is estimated by using an empirical area-volume relationship. The results allow us to understand the long-term evolution of the fluvial system in southwestern flank of Pico de Orizaba volcano. They also show a useful mapping methodology for developing inventories, assessing susceptibility, and estimated volumes associated with landslides in volcanic terrains.

  16. Factors That Explain the Attitude towards Statistics in High-School Students: Empirical Evidence at Technological Study Center of the Sea in Veracruz, Mexico

    Science.gov (United States)

    Rojas-Kramer, Carlos; Limón-Suárez, Enrique; Moreno-García, Elena; García-Santillán, Arturo

    2018-01-01

    The aim of this paper was to analyze attitude towards statistics in high-school students using the SATS scale designed by Auzmendi (1992). The sample was 200 students from the sixth semester of the afternoon shift, who were enrolled in technical careers from the Technological Study Center of the Sea (Centro de Estudios Tecnológicos del Mar 07…

  17. Visitor effect on the behavior of a group of spider monkeys (Ateles geoffroyi) maintained at an island in Lake Catemaco, Veracruz/Mexico.

    Science.gov (United States)

    Pérez-Galicia, Sergio; Miranda-Anaya, Manuel; Canales-Espinosa, Domingo; Muñoz-Delgado, Jairo

    2017-12-01

    We analyzed the effect of human visitors on the behavior of a group of spider monkeys (Ateles geoffroyi) kept on a small tourist island. Although the spider monkey is a common species in zoos, there are very few specific studies on visitor effects on these monkeys. We conducted behavioral observations on the group of spider monkeys to evaluate the effect of visitors. We also used actimetry devices to measure the variations in the spider monkeys' locomotor activity associated with human presence. With regard to the effect on behavior, we found an increase in self-directed behaviors and a decrease in vocalization, both associated with human presence. Moreover, our results suggest that when people feed monkeys, there is an increase in agonistic behaviors. On the other hand, we found that changes in activity levels in response to human presence vary among individuals. We conclude that changes in spider monkeys' behavior could provide evidence of the negative effect of visitors in our study conditions. Although we discuss the differences in activity levels due to differences in social position, further research is required this topic. Our results can be used to inform management plans for this species in captivity. Improving this relationship between humans and non-human primates through tourism education programs would benefit ecotourism and therefore species conservation programs. © 2017 Wiley Periodicals, Inc.

  18. Social limitations to livelihood adaptation : responses of maize-farming smallholder households to neoliberal policy reforms in Morelos, Southern Veracruz, Mexico

    NARCIS (Netherlands)

    Groenewald, S.F.

    2012-01-01

    This thesis describes the adaptation of smallholders to market changes shaped by neoliberal policy reforms in the Mexican maize sector. Contrary to expectations about smallholder responses to a liberalised maize market, in the study area maize still is the main source of income. Farmers did not

  19. Correlation between preoperative serum alpha-fetoprotein levels and survival with respect to the surgical treatment of hepatocellular carcinoma at a tertiary care hospital in Veracruz, Mexico

    Directory of Open Access Journals (Sweden)

    G. Martínez-Mier

    2017-10-01

    Full Text Available Introduction: Preoperative serum alpha-fetoprotein levels can have predictive value for hepatocellular carcinoma survival. Aim: Our aim was to analyze the correlation between preoperative serum alpha-fetoprotein levels and survival, following the surgical treatment of hepatocellular carcinoma. Methods: Nineteen patients were prospectively followed (07/2005-01/2016. An ROC curve was created to determine the sensitivity and specificity of alpha-fetoprotein in relation to survival (Kaplan-Meier. Results: Of the 19 patients evaluated, 57.9% were men. The mean patient age was 68.1 ± 8.5 years and survival at 1, 3, and 5 years was 89.4, 55.9, and 55.9%. The alpha-fetoprotein cutoff point was 15.1 ng/ml (sensitivity 100%, specificity 99.23%. Preoperative alpha-fetoprotein levels below 15.1, 200, 400, and 463 ng/ml correlated with better 1 and 5-year survival rates than levels above 15.1, 200, 400, and 463 ng/ml (P<.05. Conclusions: Elevated preoperative serum alpha-fetoprotein levels have predictive value for hepatocellular carcinoma survival. Resumen: Introducción: Los niveles séricos de alfafetoproteína (AFP preoperatoria pueden tener valor predictivo para la sobrevida del hepatocarcinoma (HCC. Objetivo: Analizar la correlación entre los niveles séricos de AFP preoperatoria y la sobrevida posterior al tratamiento quirúrgico del HCC. Métodos: Diecinueve pacientes fueron seguidos prospectivamente (julio del 2005-enero del 2016. Se realizó una curva ROC para determinar la sensibilidad y la especificidad de la AFP con relación con la sobrevida (Kaplan-Meier. Resultados: Se evaluó a 19 pacientes, 57.9% hombres, edad media 68.1 ± 8.5 años con sobrevida a 1, 3 y 5 años del 89.4, el 55.9 y el 55.9%. El punto de corte de AFP fue 15.1 ng/ml (sensibilidad 100%, especificidad 99.23%. Los niveles preoperatorios de AFP menores de 15.1, 200, 400 y 463 ng/ml correlacionaron con mejor sobrevida a 1 y 5 años que niveles mayores de AFP (p < 0.05. Conclusiones: Los niveles séricos preoperatorios elevados de AFP tienen valor predictivo en relación con la sobrevida de HCC. Keywords: Hepatocellular carcinoma, Liver resection, Alpha-fetoprotein, Survival, Palabras clave: Hepatocarcinoma, Resección hepática, Alfafetoproteína, Sobrevida

  20. Distribución espacial de la macrofauna edáfica en bosque mesófilo, bosque secundario y pastizal en la reserva La Cortadura, Coatepec, Veracruz, México Spatial distribution of soil macrofauna in cloud forest, secondary forest and grassland in La Cortadura reserve, Coatepec, Veracruz, Mexico

    Directory of Open Access Journals (Sweden)

    Isis N. De la Rosa

    2012-03-01

    Full Text Available La conversión de un área de bosque para la agricultura o el pastoreo homogeniza las propiedades del suelo y las comunidades de macroinvertebrados. Este trabajo estudió si la diversidad (H', densidad y heterogeneidad espacial (tamaño de parche de macroinvertebrados de hojarasca y suelo se recuperan en una secuencia sucesional pastizal (Pas-bosque secundario (Bsec-bosque mesófilo maduro (BMM. En el sustrato hojarasca se observó un gradiente de aumento para todas las variables estudiadas en la secuencia Pas-Bsec-BMM. Sin embargo, este patrón no se presentó en el suelo, ya que la mayor diversidad y densidad (por taxón y total se encontraron en el Bsec. Mediante un análisis de variografía, en la hojarasca se encontraron distribuciones espaciales heterogéneas de los macroinvertebrados en ambos bosques, mientras que en el pastizal la distribución fue homogénea, lo que apoya la idea de que el disturbio va acompañado de una homogenización espacial de las comunidades de macroinvertebrados, pero la restructuración espacial se recupera en la sucesión temprana. En el suelo de los 3 sitios, la distribución de todas las variables fue en parches (5 a 60 m de diámetro, pero no se encontró disminución en la heterogeneidad espacial predicha para la secuencia Pas-Bsec-BMM.The conversion of forest to agriculture or pasture homogenizes soil properties, including the communities of macroinvertebrates. This study examined whether the diversity (H', density and spatial heterogeneity (patch size of litter and soil macroinvertebrate recover through the secondary successional sequence pasture (Pas-secondary forest (Bsec- mature cloud forest (BMM. In the litter an increasing gradient for all variables was observed through the successional sequence. However, this pattern was not present in the soil, where the highest diversity and density (per taxon and total were found in the Bsec. Using variography, we found heterogeneous spatial distributions of litter macroinvertebrates in both forests, while their distribution was homogeneous in the pasture. This supports the idea that disturbance is accompanied by a spatial homogenization of macroinvertebrate communities but spatial restructuring occurs in early succession. However, in the soil, macroinvertebrate variables were distributed in patches (5 to 60 m in diameter in the 3 sites and, the decrease in spatial heterogeneity predicted for the sequence Pas-BSsec-BMM was not observed.

  1. Situación de la producción de fríjol y maíz en concepción de pilas y Veracruz de Pejibaye, Costa Rica

    Directory of Open Access Journals (Sweden)

    Pablo Alvarez

    2001-01-01

    Full Text Available El estudio socioeconómico se llevó a cabo en la zona sur de Costa Rica, en el distrito de Pejibaye del cantón de Pérez Zeledón, mediante una encuesta a 80 productores escogidos aleatoriamente; en el mes de mayo de 1999. El 84% de los agricultores poseen tierra propia para la producción, con unidades productivas en promedio de 14,5 ha. La mayoría de los productores de granos básicos diversifican con otras actividades agropecuarias, como tiquisque, café y pastos. El nivel de diversificación se incrementó con el tamaño de las unidades productivas. La mayor parte lo diversifica con la combinación maíz y frijol. El 90% de los productores que siembran maíz, tienen este cultivo durante la época veranera (diciembre a febrero, con un área promedio de 2,5 ha y con un rendimiento promedio de 1,9 t/ha. En el caso del frijol la siembra principal se da en la época inverniz (mayo a agosto, con un área promedio de 3 ha, y un rendimiento de 0,6 t/ha. Para ambos granos, la tendencia es hacia la reducción de áreas y rendimientos. Tanto para maíz como para frijol , la mayor parte de la cosecha se destina a la venta, y en general se puede señalar que la producción de ambos granos resulta rentable en términos de la relación beneficio/costo, siendo más rentable la actividad frijolera. En los últimos años las inestabilidades climáticas han afectado los rendimientos de los granos básicos, lo cual ha llevado a los productores a incursionar en otras actividades productivas. Los productores han empezado a utilizar una serie de estrategias para contrarrestar estos efectos, tales como el uso de coberturas, y diversas prácticas culturales y agronómicas

  2. Variación espacio-temporal de la comunidad de macroinvertebrados epibiontes en las raíces del mangle rojo Rhizophora mangle (Rhizophoraceae en la laguna costera de La Mancha, Veracruz, México

    Directory of Open Access Journals (Sweden)

    Marcela Ruiz

    2014-12-01

    Full Text Available La laguna de La Mancha está conectada al Golfo de México a través de una boca estuarina efímera, una barra arenosa, la cual se abre durante la época de lluvias y se cierra durante el otoño y la temporada de vientos invernales. Cuando la laguna se llena con la entrada de agua proveniente de un arroyo permanente, ubicado en la parte sur, el nivel del agua se incrementa y la barra arenosa se abre, descargando grandes volúmenes de agua hacia el océano y dejando expuesta a la desecación la zona intermareal previamente inundada. En este estudio, se describen las variaciones espacio-temporales de la estructura y composición de la comunidad de epibiontes que vive en la superficie de las raíces del mangle rojo,y su relación con la dinámica hidrológica de la boca estuarina. Se recolectaron cuatro raíces trimestralmente, durante un año, en diez estaciones de muestreo. También se midió la temperatura del agua, salinidad, oxígeno disuelto, profundidad y transparencia en cada muestreo. Se determinó la abundancia, la biomasa y la riqueza específica, a lo largo de las raíces en segmentos verticales de 10cm llamados horizontes. Se registraron un total de 59 632 especímenes y una biomasa total de 172g/cm2, y un máximo de once horizontes presentaron al menos una especie de epibionte. Se identificaron dos especies de poliquetos, 12 de moluscos y 14 de crustáceos, siendo Mytilopsis leucophaeata la más abundante, Ficopomatus miamiensis la más común y Crassostrea rhizophorae la de mayor contribución a la biomasa. Se evaluó la eficiencia del muestreo mediante curvas de acumulación de especies, resultando que la eficiencia fue, en general, >90% de la riqueza estimada por modelos asintóticos. La hidrodinámica de la boca estuarina tuvo gran influencia en las condiciones ambientales de la laguna y en las variaciones espacio-temporales de la comunidad de epibiontes: (a cuando la boca estuarina está cerrada son más claros los gradientes ambientales norte-sur, (b cuando la boca estuarina se cierra y el nivel de inundación se incrementa, los epibiontes, especialmente la especie pionera F. miamiensis, ocupan los horizontes más altos de las raíces, (c la abundancia, biomasa y riqueza específica de los epibiontes se incrementó hacia las partes más profundas del sur de la laguna, así como en los horizontes permanentemente inundados, y durante el cierre estacional de la boca estuarina. Las variaciones en la profundidad dependen de la dinámica de la boca estuarina, sugiriendo que estos factores son los principales parámetros que estructuran a la comunidad de epibiontes de La Mancha.

  3. A mathematical model; Un modelo matematico para el comportamiento de la radiosensibilidad medida con la viabilidad huevo-adulto de Drosophila melanogaster y D. simulans de Laguna Verde, Veracruz

    Energy Technology Data Exchange (ETDEWEB)

    Castillo M, J.A.; Pimentel P, A.E. [Instituto Nacional de Investigaciones Nucleares, A.P. 18-1027, 11801 Mexico D.F. (Mexico)

    2000-07-01

    This work presents the results to define the adult egg viability behavior (VHA) of two species, Drosophila melanogaster and D. simulans obtained with the mathematical model proposed, as well as the respective curves. The data are the VHA result of both species coming from the vicinity of the Laguna Verde Nuclear Power plant (CNLV) comprise a 10 years collect period starting from 1987 until 1997. Each collect includes four series of data which are the VHA result obtained after treatment with 0, 4, 6 and 8 Gy of gamma rays. (Author)

  4. Diagnóstico de la situación de los viveros oficiales de Veracruz y su papel para apoyar programas de reforestación y restauración

    Directory of Open Access Journals (Sweden)

    G. Benítez

    2002-01-01

    Full Text Available Ante la necesidad actual de restituir la cobertura vegetal desaparecida, a través de programas de reforestación y restauración, especialmente con especies nativas, los viveros han cobrado un papel relevante como depositarios y proveedores de este tipo de plantas, sobre todo ahora que se reconoce su importancia para la conservación de la biodiversidad. Uno de los principales problemas a los que se enfrentan estos programas, es la disponibilidad de material, no sólo en número, sino en calidad y talla. Es muy posible que el éxito de estos esfuerzos de rehabilitación ambiental dependerá del buen desempeño en el proceso que involucra desde la recolección de semilla y siembra, hasta el establecimiento y mantenimiento de las plantas en el sitio. Los viveros actualmente enfrentan una severa situación debido a problemas técnicos, económicos y de organización, que resultan en una deficiente producción de planta en calidad y cantidad. Con base en el análisis de una encuesta y entrevista a los encargados de los viveros del estado, se elaboró un diagnóstico de la situación que enfrentan y del potencial productivo que tienen, para apoyar programas de reforestación y restauración ecológica.

  5. Diagnóstico de la situación de los viveros oficiales de Veracruz y su papel para apoyar programas de reforestación y restauración

    OpenAIRE

    G. Benítez; M. Equihua; M. T. Pulido Salas

    2002-01-01

    Ante la necesidad actual de restituir la cobertura vegetal desaparecida, a través de programas de reforestación y restauración, especialmente con especies nativas, los viveros han cobrado un papel relevante como depositarios y proveedores de este tipo de plantas, sobre todo ahora que se reconoce su importancia para la conservación de la biodiversidad. Uno de los principales problemas a los que se enfrentan estos programas, es la disponibilidad de material, no sólo en número, sino en ...

  6. Seguimiento del procedimiento diagnóstico de tuberculosis pulmonar en tosedores crónicos indígenas de la Sierra Santa Marta, Veracruz, México

    OpenAIRE

    Nazar Beutelspacher, Austreberta; Montero Mendoza, Elda; Vázquez García, Verónica

    2007-01-01

    La tuberculosis pulmonar como causa de enfermedad y muerte es un importante problema de salud pública, debido a que un gran número de personas que desarrollan tuberculosis no tienen oportunidad del diagnóstico y tratamiento oportunos. El objetivo de este estudio fue explorar la colaboración de la población tosedora para seguir el procedimiento diagnóstico establecido por la Norma Oficial Mexicana para la Prevención y Control de la Tuberculosis en la atención primaria a la salud...

  7. Seguimiento del procedimiento diagnóstico de tuberculosis pulmonar en tosedores crónicos indígenas de la Sierra Santa Marta, Veracruz, México

    Directory of Open Access Journals (Sweden)

    Nazar Beutelspacher, Austreberta

    2007-01-01

    Full Text Available La tuberculosis pulmonar como causa de enfermedad y muerte es un importante problema de salud pública, debido a que un gran número de personas que desarrollan tuberculosis no tienen oportunidad del diagnóstico y tratamiento oportunos. El objetivo de este estudio fue explorar la colaboración de la población tosedora para seguir el procedimiento diagnóstico establecido por la Norma Oficial Mexicana para la Prevención y Control de la Tuberculosis en la atención primaria a la salud (NOM en poblaciones indígenas, en un contexto de elevada prevalencia de tuberculosis pulmonar, pobreza y ausencia de servicios locales de salud. Se estimó la prevalencia de tos crónica y se realizó análisis multivariado usando un modelo de regresión logística lineal para identificar algunos factores explicativos del número de muestras de expectoración entregadas. Se discuten las dificultades para establecer el diagnóstico de tuberculosis pulmonar en población indígena y se propone la necesidad de replantear las estrategias de búsqueda y diagnóstico en poblaciones de alto riesgo como la considerada en este estudio.

  8. Generación y composición de residuos sólidos domésticos en localidades urbanas pequeñas en el estado de Veracruz, México

    OpenAIRE

    CASTILLO-GONZÁLEZ, Eduardo; DE MEDINA-SALAS, Lorena

    2014-01-01

    En México se han realizado estudios de generación y composición de residuos sólidos domésticos (RSD), sin embargo no han sido específicos para localidades urbanas pequeñas. Para realizar una gestión adecuada de RSD, que permita a los municipios desarrollar una planeación estratégica es importante contar con datos confiables. Esta investigación tuvo como objetivo determinar la generación per cápita promedio (GPC) y la composición de RSD generados en viviendas de una localidad urbana pequeña ub...

  9. Fallas de mercado y márgenes de comercialización en bovinos destinados al abasto de carne en la región del Papaloapan, Veracruz

    Directory of Open Access Journals (Sweden)

    Julio Vilaboa-Arroniz

    2010-01-01

    Full Text Available El objetivo de este trabajo es identificar fallas de mercado y los patrones que estipulan los precios de compra-venta, con la finalidad de determinar su influencia en el margen bruto de omercialización (mbc en el esquema de comercio tradicional de bovinos para el abasto de carne en la región del Papaloapan. Los precios se determinan de manera empírica y subjetiva, pues la habilidad para negociar y fijar el precio por parte de los agentes es determinante. Además, por cada kilo de carne que paga el consumidor, los intermediarios se quedan con el mayor mbc.

  10. CARACTERIZACIÓN CLÍNICA Y PATÓLOGICA DE LA ENCEFALITIS EQUINA VENEZOLANA SUBTIPO IE EN UNA REGIÓN ENDÉMICA EN EL SUR DEL ESTADO DE VERACRUZ EN MODELOS EQUINOS

    OpenAIRE

    FABELA BECERRIL, VERÓNICA ALEJANDRINA

    2016-01-01

    La Encefalitis Equina Venezolana (EEV) es una enfermedad que se presenta principalmente en equinos y humanos y se caracteriza por un cuadro febril que en ocasiones va seguido de uno neurológico y la muerte. El agente etiológico es un virus clasificado dentro de la familia Togaviridae, género alfavirus (1) , el cual fue reconocido por primera vez en Venezuela por Beck y Wickoff en 1938 y por Kubes y Ríos en 1939 (2, 3, 4, 5, 6, 7, 8) La enfermedad se consideró propia del norte de Sudamérica...

  11. Reconstruction of depositional environment of a tropical estuary and response of δ 13 Corg and TOC/TN signatures to changing environmental conditions

    Digital Repository Service at National Institute of Oceanography (India)

    Volvoikar, S.P.; Nayak, G.N.; Mazumdar, A.; Peketi, A.

    -Marine Letters 29 (6), 415-429. 13    Ruiz-Fernández, A. C., Hillaire-Marcel, C., Páez-Osuna, F., Ghaleb, B., Caballero, M., 2007. 210Pb chronology and trace metal geochemistry at Los Tuxtlas, Mexico, as evidenced by a sedimentary record from the Lago...

  12. Search Results | Page 27 | IDRC - International Development ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Results 261 - 270 of 369 ... High income inequality in developed countries is attributed to skill-biased ... Resources and Division of Labour along Gender Lines in Veracruz, Mexico ... ICTs for Microcredit Delivery : Correspondent Banking in Brazil.

  13. Gravitational collapse and Neogene sediment transfer across the western margin of the Gulf of Mexico: Insights from numerical models

    NARCIS (Netherlands)

    Alzaga-Ruiz, H.; Granjeon, D.; Lopez, M.; Séranne, M.; Roure, F.

    2009-01-01

    The western margin of the Gulf of Mexico (Veracruz State, Mexico) displays an extensive Neogene gravitational system, whereby the Neogene siliciclastic sediments are detached from underlying Mesozoic carbonates along decollement surface in Oligocene underpressured clays. Rapidly subsiding

  14. 75 FR 15772 - Additional Designations, Foreign Narcotics Kingpin Designation Act

    Science.gov (United States)

    2010-03-30

    .... OEGI740531 (Mexico); Electoral Registry No. ORGLIS740531121H100 (Mexico); (INDIVIDUAL) [SDNTK] 29. VERA CALVA, Carlos, Calle E. Zapata No. 2, Col. Plan de Ayala, Tihuatlan, Veracruz, Mexico; DOB 10 Jul 1970; POB Poza...

  15. Frequency modulator. Transmission of meteorological signals in LVC; Modulador de frecuencia. Transmision de senales meteorologicas en CLV

    Energy Technology Data Exchange (ETDEWEB)

    Rivero G, P.T.; Ramirez S, R.; Gonzalez M, J.L.; Rojas N, P.; Celis del Angel, L. [ININ, 52750 La marquesa, Estado de Mexico (Mexico)

    2007-07-01

    The development of the frequency modulator and demodulator circuit for transmission of meteorological signals by means of fiber optics of the meteorology station to the nuclear reactor unit 1 in the Laguna Verde Central in Veracruz is described. (Author)

  16. Frequency modulator. Transmission of meteorological signals in LVC

    International Nuclear Information System (INIS)

    Rivero G, P.T.; Ramirez S, R.; Gonzalez M, J.L.; Rojas N, P.; Celis del Angel, L.

    2007-01-01

    The development of the frequency modulator and demodulator circuit for transmission of meteorological signals by means of fiber optics of the meteorology station to the nuclear reactor unit 1 in the Laguna Verde Central in Veracruz is described. (Author)

  17. International Migration, Management of Natural Resources and ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    ... of Natural Resources and Division of Labour along Gender Lines in Veracruz, Mexico ... Mexico, are experiencing an increased rate of migration to Mexico City and the ... Linking research to urban planning at the ICLEI World Congress 2018.

  18. Photometric characterization of LED's for optimal design of interior lamps

    International Nuclear Information System (INIS)

    Hernandez, O.; Guerra, H.; Leon, V.; Torres, A. W.; Castannon, H.; Camas, J.

    2012-01-01

    The Tuxtla Gutierrez Technology Institute, and the Innovaluz of Mexico S A of C V company have joined forces to develop LED lighting technology in Chiapas, Mexico. We performed a comprehensive study of power savings for a household using this luminary. The main results of the Lighting are presented exclusively for the ILIGPL153BF24W model, as well as the design features of a functional lamp. (Author)

  19. Using NJOY99 and MCNP4B2 to Estimate the Radiation Damage Displacements per Atom per Second in Steel Within the Boiling Water Reactor Core Shroud and Vessel Wall from Reactor-Grade Mixed-Oxide/Uranium Oxide Fuel for the Nuclear Power Plant at Laguna Verde, Veracruz, Mexico

    International Nuclear Information System (INIS)

    Vickers, Lisa

    2003-01-01

    The government of Mexico has expressed interest in utilizing the Laguna Verde boiling water reactor (BWR) nuclear power plant for the disposition of reprocessed spent uranium oxide (UOX) fuel in the form of reactor-grade mixed-oxide (MOX) fuel. MOX fuel would replace spent UOX fuel as a fraction in the core from 18 to 30% depending on the fuel loading cycle. MOX fuel is expected to increase the neutron fluence, flux, fuel centerline temperature, reactor core pressure, and yield higher energy neutrons.There is concern that a core with a fraction of MOX fuel (i.e., increased 239 Pu wt%) would increase the radiation damage displacements per atom per second (dpa-s -1 ) in steel within the core shroud and vessel wall as compared to only conventional, enriched UOX fuel in the core. The evaluation of radiation damage within the core shroud and vessel wall is a concern because of the potentially adverse affect to personnel and public safety, environment, and operating life of the reactor.The primary uniqueness of this paper is the computation of radiation damage (dpa-s -1 ) using NJOY99-processed cross sections for steel within the core shroud and vessel wall. Specifically, the unique radiation damage results are several orders of magnitude greater than results of previous works. In addition, the conclusion of this paper was that the addition of the maximum fraction of one-third MOX fuel to the LV1 BWR core did significantly increase the radiation damage in steel within the core shroud and vessel wall such that without mitigation of radiation damage by periodic thermal annealing or reduction in operating parameters such as neutron fluence, core temperature, and pressure, it posed a potentially adverse affect to the personnel and public safety, environment, and operating life of the reactor

  20. Comercio internacional, desarrollo local y construcción de territorios competitivos e innovadores en América Latina: el caso del estado de Veracruz México) en el marco del tratado de libre comercio de América del Norte (TLCAN). Aplicación a un parque tecnológico.

    OpenAIRE

    Hernández Rodríguez, Jesús Roberto

    2007-01-01

    La presente tesis aborda desde la perspectiva de la Nueva Geografía Económica un modelo de desarrollo local que incorpora la innovación tecnológica como su eje principal aunque no único. Por otra parte, con el fin de partir de una base de análisis territorial se hace una tipología de los territorios de acuerdo a los principios de convergencia conocidos ampliamente en la literatura económica del crecimiento y desarrollo como convergencia sigma y convergencia beta, para poder tipificar dichos t...

  1. Deep divergences and extensive phylogeographic structure in a clade of lowland tropical salamanders

    Directory of Open Access Journals (Sweden)

    Rovito Sean M

    2012-12-01

    Full Text Available Abstract Background The complex geological history of Mesoamerica provides the opportunity to study the impact of multiple biogeographic barriers on population differentiation. We examine phylogeographic patterns in a clade of lowland salamanders (Bolitoglossa subgenus Nanotriton using two mitochondrial genes and one nuclear gene. We use several phylogeographic analyses to infer the history of this clade and test hypotheses regarding the geographic origin of species and location of genetic breaks within species. We compare our results to those for other taxa to determine if historical events impacted different species in a similar manner. Results Deep genetic divergence between species indicates that they are relatively old, and two of the three widespread species show strong phylogeographic structure. Comparison of mtDNA and nuclear gene trees shows no evidence of hybridization or introgression between species. Isolated populations of Bolitoglossa rufescens from Los Tuxtlas region constitute a separate lineage based on molecular data and morphology, and divergence between Los Tuxtlas and other areas appears to predate the arrival of B. rufescens in other areas west of the Isthmus of Tehuantepec. The Isthmus appears responsible for Pliocene vicariance within B. rufescens, as has been shown for other taxa. The Motagua-Polochic fault system does not appear to have caused population vicariance, unlike in other systems. Conclusions Species of Nanotriton have responded to some major geological events in the same manner as other taxa, particularly in the case of the Isthmus of Tehuantepec. The deep divergence of the Los Tuxtlas populations of B. rufescens from other populations highlights the contribution of this volcanic system to patterns of regional endemism, and morphological differences observed in the Los Tuxtlas populations suggests that they may represent an undescribed species of Bolitoglossa. The absence of phylogeographic structure in B

  2. Cupapé (Cordia dodecandra DC., Boraginaceae a fruit tree in the process of domestication in Mexico

    Directory of Open Access Journals (Sweden)

    Leszek S. Jankiewicz

    2014-01-01

    Full Text Available The fruit tree. Cordia dodecandra DC.. which is partly domesticated in the region of Tuxtla Gutierrez, Chiapas (Mexico is described from the horticultural and biological point of view. The fruit is up to 5 cm in diameter and its flesh contains 14-25%; of total lipids, 6-14%; of total protein and 5-15% of total sugars in dry mass. The fresh fruit does not have a very good flavor but cooked with sugar is very tasty. The plant shows marked variability which can be taken into consideration in the selection of better forms for vegetative propagation and breeding.

  3. Novas espécies de Adetus (Coleoptera, Cerambycidae, Lamiinae, Apomecynini New species of Adetus (Coleoptera, Cerambycidae, Lamiinae, Apomecynini

    Directory of Open Access Journals (Sweden)

    Ubirajara R. Martins

    2005-03-01

    Full Text Available Trata-se da descrição de novas espécies de Adetus LeConte, 1852, provenientes da Bolívia (Santa Cruz: Adetus cacapira sp. nov. e A. cecamirim sp. nov.; do Peru (Cuzco e da Bolívia (Santa Cruz: A. inca sp. nov. e do México (Veracruz: A. catemaco sp. nov.The following species of Adetus LeConte, 1852 are described: from Bolivia (Santa Cruz, A. cacapira sp. nov. and A. cecamirim sp. nov.; from Peru (Cuzco, and Bolívia (Santa Cruz, A. inca sp. nov.; from Mexico (Veracruz, A. catemaco sp. nov.

  4. SERVICIO DE CONVERGENCIA DIGITAL

    OpenAIRE

    Lizzet Mirafuentes Garay

    2009-01-01

    El propósito del estudio fue analizar cuáles son las principales ventajas que proporciona el servicio de convergencia digital en los hoteles de la zona conurbada de Veracruz-Boca del Río. Para ello, se aplicaron 30 encuestas en hoteles que cuentan con un sistema de convergencia digital como sistema de comunicación y entretenimiento dentro de la zona conurbada Veracruz Boca del Río. El informante fue la persona de mayor jerarquía y que además se relacionara con la tecnología utilizada en el ho...

  5. Soil transfer function obtention by Wiener's optimum filter

    International Nuclear Information System (INIS)

    Flores Ruiz, J.H.

    1987-01-01

    Transfer function in nuclear power plant Laguna Verde, Veracruz, using Wiener filter. This paper deal with identification of complex structural and soil-interaction systems often are modeling in nuclear industry. Nonparametric identification techniques are used to analyse the response of a class nonlinear vibrations. Efficient computational algorithms and experimental techniques based input-output system methods such as the Wiener-Kernel approach and least-square regression techniques are applied to get the transfer function in nuclear power plant Laguna Verde, Veracruz (Mexico) (Author)

  6. Aspidoscelis deppii (Black-bellied Racerunner). Predation by Great Egrets

    Science.gov (United States)

    Reynolds, Robert P.; Whatton, James F.; Gebhard, Christina A.

    2014-01-01

    Aspidoscelis deppii) is widely distributed from Veracruz and Michoacan, Mexico to Costa Rica (Köhler et al. 2006. The Amphibians and Reptiles of El Salvador. Krieger Publishing Co., Malabar, Florida. 238 pp.). Neotropical lizards are abundant and common prey to all classes of terrestrial vertebrates, and bird predation of lizards is well known.

  7. The U.S. Navy, the Neutrality Patrol, and Atlantic Fleet Escort Operations, 1939-1941

    Science.gov (United States)

    1991-05-13

    Hereward in the Yucatan Channel, watching as the British ship refueled from a G- 3 class cruiser.3 3 Later that month, two American destroyers and the...4 0 On 14 December, the German freighter Arauca put out of Veracruz, and shaped a course for Hamburg. The ship’s cargo included " sisal , phosphate

  8. National Energy Policy: Report of the National Energy Policy Development Group

    Science.gov (United States)

    2001-05-01

    and a prop- ping agent (usually sand) are pumped into the reservoir rock, widening natural fractures to provide paths for the gas to migrate to the...Oil Producing Prospective Region Veracruz Bahia de Campeche Macuspana Gulf of California Mexico City • Mazatlan Basin Chapter 8 • Strengthening

  9. Patterns of macromycete community assemblage along an elevation gradient: options for fungal gradient and metacommunity analyse

    Science.gov (United States)

    Marko Gómez-Hernández; Guadalupe Williams-Linera; Roger Guevara; D. Jean Lodge

    2012-01-01

    Gradient analysis is rarely used in studies of fungal communities. Data on macromycetes from eight sites along an elevation gradient in central Veracruz, Mexico, were used to demonstrate methods for gradient analysis that can be applied to studies of communities of fungi. Selected sites from 100 to 3,500 m altitude represent tropical dry forest, tropical montane cloud...

  10. PREFACE: 4th National Meeting in Chaos, Complex System and Time Series

    Science.gov (United States)

    Raúl Hernández Montoya, Alejandro; Hernández Lemus, Enrique; Rubén Luévano Enríquez, José; Rodríguez Achach, Manuel Enrique; Vargas Madrazo, Carlos Ernesto

    2013-12-01

    The fourth edition of the National Meeting on Chaos, Complex Systems and Time Series (NMCCSTS4), or in Spanish 4a. Reunión Nacional de Caos, Sistemas Complejos y Series de Tiempo, was held from 29 November to 2 December 2011 in the University of Veracruz (Universidad Veracruzana), Campus Xalapa, at Xalapa Veracruz, México, in the beautiful House of the Lake (Casa del Lago), a late XIX century former textile factory situated in the edge of an also ancient former dam, currently a park containing three small lakes, very emblematic of Xalapa, City, the capital of the state of Veracruz, México. The previous editions of this meeting, were held in Mérida (2006), Pachuca (2008) and Puebla (2009). A clear uptrend is observed in the number of participants in this academic event from all Universities of México and abroad, going from about 15 participants in the first meeting to more than 90 in the last one. On this occasion, about 90 participants from three countries attended our event, where 29 papers (10 master lectures from top recognized national and international leaders in the fields of complexity, and 19 invited papers), one course for students and 42 posters were presented. A look at the scientific program of the NMCCSTS4, allows us to appreciate the wide range of topics and recent advances that were covered during our event; topics and recent results in the areas of biology, econophysics, sociophysics, genomics and bioinformatics, complex networks, thermodynamics, etc, were presented and discussed rigorously in a friendly, dynamical and informal atmosphere. Also, on this occasion, we celebrated Professor Miguel Angel Jiménez Montaño, for his very distinguished academic career throughout more that 50 years and as a founding member of the Faculty of Physics and AI of University of Veracruz. Prizes were awarded for the best poster presentations. The winner was Porfirio Toledo, from Faculty of Mathematics, University of Veracruz (Game theory to characterize

  11. Self-Access Language Learning: Students' Perceptions of and Experiences within This New Mode of Learning (Aprendizaje de idiomas mediante la modalidad de autoacceso: percepciones y experiencias de los estudiantes)

    Science.gov (United States)

    Herrera Díaz, Luz Edith

    2012-01-01

    With the aim of fostering autonomy in learning, both innovations, the self-access centre and the mode of learning derived from it, were adopted in the context of the study (Language Centre in the University of Veracruz, Mexico). Based on a case study, I have adopted a qualitative perspective to do this research, which aimed to know how the…

  12. Studies of Lactarius from Mexico: a new species in subgenus Piperites

    NARCIS (Netherlands)

    Montoya, L.; Bandala, V.M.; Moreno, G.

    1998-01-01

    Lactarius lacteolutescens is described as a new member in subgenus Piperites subsect. Croceini. It was found growing in a mixed forest of Pinus spp. and Abies hickellii, at Mt. Cofre de Perote, Central Region of the State of Veracruz (Gulf Area, Mexico).

  13. Leucism in Mexican small-eared shrew Cryptotis mexicana (Mammalia : Soricomorpha), endemic to Mexico

    NARCIS (Netherlands)

    Guevara, Lazaro; Ramirez-Chaves, Hector E.; Cervantes, Fernando A.

    Leucism is the partial or complete reduction of the fur pigmentation where eyes and skin maintain their normal coloration. In this paper, we report the record of an individual of the endemic Mexican shrew Cryptotis mexicana from Veracruz, Mexico, that displays leucism. This lack of pigmentation,

  14. Spatial Modeling of Industrial Windfall on Soils to Detect Woody Species with Potential for Bioremediation

    Science.gov (United States)

    S. Salazar; M. Mendoza; A. M. Tejeda

    2006-01-01

    A spatial model is presented to explain the concentration of heavy metals (Fe, Cu, Zn, Ni, Cr, Co and Pb), in the soils around the industrial complex near the Port of Veracruz, Mexico. Unexpected low concentration sites where then tested to detect woody plant species that may have the capability to hiperacumulate these contaminants, hence having a potential for...

  15. Local Resignifications of Transnational Discourses in Intercultural Higher Education: The Case of the "Universidad Veracruzana Intercultural" in Mexico

    Science.gov (United States)

    Mateos Cortés, Laura Selene; Dietz, Gunther

    2017-01-01

    Our main objective is to analyze the different ways in which people involved in the Mexican intercultural education subsystem conceive interculturality. This subsystem is still emerging and we refer to the specific case of Veracruz. We point out the discursive elements implied in the construction of definitions as well as the linguistic screens…

  16. Antibacterial activity of crude extracts from Mexican plants against ...

    African Journals Online (AJOL)

    The aim of this study was to evaluate the antimicrobial activity of 36 extracts from 18 vegetal species used as soap, insecticides, insect repellent and for the treatment of several diseases likely associated to microorganisms. The vegetal species were collected in Oaxaca, Puebla and Veracruz States, México. The extracts ...

  17. Désagrarisation de l’économie paysanne et « refonctionnalisation » de la localité rurale au Mexique

    OpenAIRE

    Léonard, Éric; Palma, Rafael

    2017-01-01

    Le travail présenté ici se propose d’analyser les modalités de recomposition des espaces ruraux mexicains dans le cadre de la ratification du Traité de libre-échange avec les États-Unis et le Canada (Alena). On assiste ainsi à la recomposition et à la mise en réseau de certains territoires autour des filières de production, conditionnement et mise en marché de produits frais à forte intensité en travail et capital. L’enquête porte plus particulièrement sur la région des Tuxtlas, au sud de l’É...

  18. Infancias indígenas. Los centros de atención a la niñez en Chiapas y el reto de la educación intercultural frente a la diversidad

    Directory of Open Access Journals (Sweden)

    Kathia Núñez Patiño

    2016-01-01

    Full Text Available Las transformaciones económicas que han impactado en las comunidades indígenas en Chiapas desde los últimos años del siglo XX han generado procesos de migración hacia ciudades como Tuxtla, Tapachula o San Cristóbal de Las Casas.. Se identifican modelos de atención a la niñez indígena con los que operan organizaciones civiles y dependencias públicas, para conocer las concepciones de infancia que subyacen en estas instituciones, su eficacia y su pertinencia cultural. Exponemos las características de los centros que ofrecen atención a la infancia, cómo se asume el contexto intercultural y los retos que enfrenta la educación formal.

  19. el territorio

    Directory of Open Access Journals (Sweden)

    Mauricio Genet Guzmán Chávez

    2006-01-01

    Full Text Available En este artículo se exponen las implicacionesprácticas del discurso de la conservación de la biodiversidad en tanto política cultural. Trata de las formas como las comunidades, los moradores o los productores que viven en las áreas naturales protegidas pueden servirse del discurso de la biodiversidad en el proyecto de defensa de su territorio y su identidad cultural. Analiza y compara los casos de la reserva de la biosfera Los Tuxtlas, México, y de la reserva extractivista Chico Mendes, Brasil, áreas donde se discuten y se ponen en marcha diferentes alternativas y programas de manejo sustentable de los recursos naturales.

  20. Factores de riesgo de síndrome metabólico en estudiantes de la universidad Pablo Guardado Chávez, año 2013

    OpenAIRE

    Bojorges Velázquez, Luis Alberto; Castillo Herrera, José Arcides; Jiménez Tamayo, Roberto

    2013-01-01

    Introducción: en México el síndrome metabólico afecta a más del 25 % de la población, lo cual se atribuye a la combinación de factores genéticos y ambientales. Objetivo: conocer la prevalencia de factores de riesgo de síndrome metabólico en una muestra de estudiantes de la Universidad Pablo Guardado Chávez de la ciudad de Tuxtla Gutiérrez, Chiapas, México. Métodos: se realizó un estudio descriptivo transversal a 190 estudiantes de 17 a 28 años de edad, 99 del sexo femenino y 91 del masculino....

  1. [Parasites of the Central American tapir Tapirus bairdii (Perissodactyla: Tapiridae) in Chiapas, Mexico].

    Science.gov (United States)

    Cruz Aldán, Epigmenio; Lira Torres, Iván; Güiris Andrade, Dario Marcelino; Osorio Sarabia, David; Quintero M, Ma Teresa

    2006-06-01

    We analyzed 19 samples of Baird's tapir feces from La Sepultura Biosphere Reserve, collected between March and July 1999. We also took samples directly from a male tapir captured at the Montes Azules Biosphere Reserve. Both reserves are in Chiapas, Mexico. We used five techniques: flotation, MacMaster, micrometric, Ritchie's sedimentation and Ferreira's quantitative. In addition, we collected ectoparasites from animals captured in both reserves and from a captive couple from Tuxtla Gutierrez, Chiapas. These nematodes and protozoans were found: Agriostomun sp., Lacandoria sp., Neomurshidia sp., Trichostrongylus sp., Strongylus sp., Brachylumus sp, and an unidentified species of ancilostomaide. We also found Eimeria sp. and Balantidium coli, as well as the mites Dermacentor halli, Dermacentor latus, Amblyomma cajannense, Amblyomma coelebs, Amblyomma ovale, Anocentor nitens and Ixodes bicornis.

  2. Analyzing the Dynamics of Inter-state water peace: A study of the Huitzilapan-Xalapa Water Transfers

    Directory of Open Access Journals (Sweden)

    Carmen Maganda

    2017-01-01

    Full Text Available This article examines the political conflict surrounding the interstate transfer of water in the Huitzilapan-Xalapa Aqueduct, from which about 60% of the water resources for the city of Xalapa, state capital of Veracruz, come. This interstate water transfer has eventually lead to political and social conflict based on misinformation about perceived water shortages to Xalapa. The article examines a case in which water officials from Xalapa have apparently complied with guidelines related to procedural, distributive, and ecological justice. Therefore, the article proposes a focus on «justice as responsible (and informed dialogue» as a central element of procedural justice. The analysis is based on a review of official documents, such as Mexican water laws and the water concession under which this water transfer has occurred, press reviews published in regional newspapers, a field visit and interviews with key stakeholders and researchers mostly in Veracruz state.

  3. 1H NMR-based metabolomic fingerprinting to determine metabolite levels in serrano peppers (Capsicum annum L.) grown in two different regions.

    Science.gov (United States)

    Becerra-Martínez, Elvia; Florentino-Ramos, Elideth; Pérez-Hernández, Nury; Gerardo Zepeda-Vallejo, L; Villa-Ruano, Nemesio; Velázquez-Ponce, Manuel; García-Mendoza, Felipe; Bañuelos-Hernández, Angel E

    2017-12-01

    Chili pepper (Capsicum annuum) is the most important and emblematic condiment in Mexican food. Serrano pepper is a variety of C. annuum that is traditionally cultivated in Mexico and commercialized in local markets. The aim of this study was to describe the 1 H NMR metabolomic profiling of the aqueous phase of serrano peppers harvested from two distinct regions, in the states of Veracruz and Oaxaca, Mexico. According to the current results, aspartate citrate, lactate, leucine and sucrose were found at higher amount in the serrano peppers from Veracruz. On the other hand, acetate, formate, fumarate, malonate, phosphocholine, pyruvate and succinate showed the highest abundance in this product from Oaxaca. These are the main metabolites that distinguish one group from the other. The spectrometric method reported presently is characterized by great simplicity, robustness and reproducibility. Thus, this technique can be used for establishing reliable metabolomic fingerprints of serrano peppers grown under different environmental conditions. Copyright © 2017 Elsevier Ltd. All rights reserved.

  4. Start up and commercial operation of Laguna Verde nuclear power plant. Unit 1

    International Nuclear Information System (INIS)

    Torres Ramirez, J.F.

    1991-01-01

    Prior to start up of Laguna Verde nuclear power plant preoperational tests and start tests were performed and they are described in its more eminent aspects. In relation to commercial operation of nuclear station a series of indicator were set to which allow the measurement of performance in unit 1, in areas of plant efficiency and personal safety. Antecedents. Laguna Verde station is located in Alto Lucero municipality in Veracruz state, 70 kilometers north-northeast from port of Veracruz and a 290 kilometers east-northeast from Mexico city. The station consist of two units manufactured by General Electric, with a nuclear system of vapor supply also called boiling water (BWR/5), and with a system turbine-generator manufactured by Mitsubishi. Each unit has a nominal power of 1931 MWt and a level design power of 675 Mwe and a net power of 654 Electric Megawatts

  5. Los estados inmaduros de Coelosis biloba (Coleoptera: Melolonthidae: Dynastinae y notas sobre su biología Immature stages of Coelosis biloba (Coleoptera: Melolonthidae: Dynastinae with notes on their biology

    Directory of Open Access Journals (Sweden)

    Luis Carlos Pardo-Locarno

    2006-12-01

    Full Text Available Se describen la larva de tercer estadio y las pupas de macho y hembra de Coelosis biloba (Linné 1767 con ejemplares recolectados en Colombia (Cauca y Valle y en México (Veracruz asociados con los hormigueros de Atta cephalotes (Linné 1750. Se incluyen ilustraciones de las estructuras diagnósticas, una clave para separar las larvas de tercer estadio hasta ahora conocidas de la tribu Oryctini en América, y observaciones sobre la biología de C. biloba como inquilino de los nidos de hormigas.The larva of third instar, male and female pupae of Coelosis biloba obtained inside ant nests of Atta cephalotes in Colombia (Cauca, Valle and Mexico (Veracruz are described. Drawings of diagnostic structures, a key to the known third instar larvae of American Oryctini, and observations on the biology of C. biloba as inquiline of ant nests, are included.

  6. SISTEMA SOLAR DE CALENTAMIENTO DEL AGUA DEL ALBERGUE DE “TEMAXCALAPA, VERACRUZ”

    Directory of Open Access Journals (Sweden)

    Jorge Arturo del Angel Ramos

    2011-02-01

    Full Text Available En el presente reporte, se presenta el cálculo de un sistema solar de calentamiento de agua parauso doméstico en un albergue de estudiantes del estado de Veracruz, México. Se hace énfasisespecial en el cálculo de la capacidad del tanque de almacenamiento del agua caliente, para lo cualse introducen algunos aspectos novedosos con respecto a los tradicionales y se presenta las diferenciasentre ambos criterios y sus resultados de diseño.  The sizing of a solar water heating system is presented for domestic use in a housing forstudents of the state of Veracruz, Mexico. A special emphasis is made in the calculation ofthe hot water storage tank capacity, in which some novel aspects are introduced with regardto the traditional ones and differences between both approaches and their design results arepresented.

  7. Morphology variation of Lutzomyia cruciata eggs (Diptera: Psychodidae: Phlebotominae) in southern Mexico.

    Science.gov (United States)

    Oca-Aguilar, Ana Celia Montes DE; Mikery-Pacheco, Oscar; Castillo, Alfredo; Rebollar-Téllez, Eduardo A; Piermarini, Peter M; Ibáñez-Bernal, Sergio

    2017-05-02

    The sand fly Lutzomyia cruciata has been associated with the transmission of Leishmania mexicana to humans in Mexico. This species has a wide distribution in Mexico occupying different microhabitats and environments. In this work comparisons of the egg exochorion of Lu. cruciata from different physiographic areas are presented. Study sites are from different states of southern Mexico. Exochorion analysis was carried out using scanning electron microscopy (SEM). Results show differences in the exochorionic pattern among samples from Veracruz (AVER), Yucatán (HOYU) and Chiapas (TACH). The morphotype "Chiapas" has a polygonal crest pattern, the morphotype "Veracruz" shows parallel and longitudinal crests with some or few connections, and the morphotype "Yucatán" has weak connections between crest ridges. These morphological differences could be the result of local adaptations or evidence of divergence within the nominal unit Lutzomyia cruciata.

  8. Parásitos del tapir centroamericano Tapirus bairdii (Perissodactyla: Tapiridae en Chiapas, México

    Directory of Open Access Journals (Sweden)

    Epigmenio Cruz Aldán

    2006-06-01

    Full Text Available Se recolectaron 19 muestras de excretas del tapir centroamericano (Tapirus bairdii en la Reserva "La Sepultura" (marzo a julio de 1999, así como un muestreo directo a un tapir macho de la Reserva "Montes Azules" (Chiapas, México. Se analizaron con cinco técnicas (flotación, MacMaster, micrometría, sedimentación de Ritchie y cuantitativa de Ferreira. Además se recolectaron muestras en piel de animales capturados en en las dos reservas y en una pareja de zoológico proveniente de Tuxtla Gutiérrez, Chiapas. Se hallaron nematodos y protozoarios: Agriostomun sp., Lacandoria sp., Neomurshidia sp., Trichostrongylus sp., Strongylus sp., Brachylumus sp., y un ancilostomaideo aun por identificar. Además se informa la presencia de Eimeria sp., y Balantidium coli. Los ácaros hallados fueron; Dermacentor halli, Dermacentor latus, Amblyomma cajannense, Amblyomma coelebs, Amblyomma ovale, Anocentor nitens e Ixodes bicornis.Parasites of the Central American tapir Tapirus bairdii (Perissodactyla: Tapiridae in Chiapas, Mexico. We analyzed 19 samples of Baird´s tapir feces from La Sepultura Biosphere Reserve, collected between March and July 1999. We also took samples directly from a male tapir captured at the Montes Azules Biosphere Reserve. Both reserves are in Chiapas, Mexico. We used five techniques: flotation, MacMaster, micrometric, Ritchie’s sedimentation and Ferreira´s quantitative. In addition, we collected ectoparasites from animals captured in both reserves and from a captive couple from Tuxtla Gutierrez, Chiapas. These nematodes and protozoans were found: Agriostomun sp., Lacandoria sp., Neomurshidia sp., Trichostrongylus sp., Strongylus sp., Brachylumus sp, and an unidentified species of ancilostomaide. We also found Eimeria sp. and Balantidium coli, as well as the mites Dermacentor halli, Dermacentor latus, Amblyomma cajannense, Amblyomma coelebs, Amblyomma ovale, Anocentor nitens and Ixodes bicornis. Rev. Biol. Trop. 54(2: 445

  9. ANÁLISIS DE LA ESTRUCTURA ARBÓREA DEL SISTEMA AGROFORESTAL DE CACAO (Theobroma cacao L. EN EL SOCONUSCO, CHIAPAS - MÉXICO

    Directory of Open Access Journals (Sweden)

    Hugo Alexander Roa Romero

    2009-09-01

    Full Text Available Se determinó la abundancia, riqueza, importancia, equidad y diversidad de los árboles encontrados en sistemas agroforestales de cacao, del Soconusco, Chiapas, México. La presente investigación, se desarrolló en la región costera del Soconusco, ubicada al sur del estado de Chiapas; se muestrearon los municipios de Huehuetán, Tapachula y Tuxtla Chico, por ser los más representativos en área sembrada de cacao. En cada municipio, se establecieron al azar siete parcelas temporales de 50 x 50 m cada una, lo que suma en total 5,25 hectáreas, en las cuales se registraron variables como el diámetro a la altura del pecho (DAP: 1,3 m sobre el nivel del suelo, área basal, y sombrío en el cacaotal. Se encontraron 46 especies agrupadas en 21 familias, las especies con el mayor valor de importancia fueron Mangifera indica y Pouteria sapota, convirtiéndose en las especies de sombra más frecuentemente encontradas. La composición florística denotó una mayor similitud en los municipios de Tapachula y Huehuetán, como lo muestra el mayor porcentaje del índice de Jaccard y en lo que respecta a diversidad, el municipio de Tuxtla Chico presentó el mayor valor según el índice de Shannon. Este estudio determina la existencia de una cobertura definitiva de preferencia asociada a los árboles frutales.

  10. Main causes and factors associated with liver cirrhosis in patients in the General Hospital of Zone 2 of Chiapas, Mexico

    Directory of Open Access Journals (Sweden)

    Carlos Alfredo Meléndez González

    2012-08-01

    Full Text Available Background: Liver cirrhosis is a worldwide public health problem. Its main characteristic is low life expectancy. In Mexico, it is the second leading cause of death in the age group with the highest work productivity. Methods: The study is observational, retrospective, descriptive and cross-sectional. Data were collected on age, sex, occupation, origin, risk factors for liver damage and probable etiology of patients referred with a diagnosis of cirrhosis in a period of 2 years. Purpose: To determine the causes and factors associated with liver cirrhosis in our population. Results: Females prevailed over males by 57.2% over 42.7%. Average age was 55.27 and 55.02% were Tuxtla Gutierrez residents. The following risk factors were found: alcohol consumption (74.67%, diabetes mellitus (56.33%, obesity (41.92%, use of alternative medicines (19.22%, frequent use of drugs (12.66%, and transfusion (9.17%. Housewives were most affected (50.21% [95% CI 43.6-56.9]. Alcoholism in 47.59% was found to be a triggering factor; in 41.92% the cause was unexplained or cryptogenic; and in 5.24% the cause was chronic viral hepatitis. Portal hypertension data were found in 89.5%: 59.8% had esophageal varices, 37.11% had ascites, and 2.62% had chronic hepatic encephalopathy. VP > 11 mm in 18.7%. The prevalence during the study period was 9.85%. Conclusions: There are significant differences observed in gender and cause of cirrhosis in this study. In the future more research should be done to look into the conditions under which women live in the city of Tuxtla Gutierrez, as well as whether other idiosyncratic factors or cultural conditions are leading to a higher prevalence of cirrhosis in this population group in the Southeast of Mexico.

  11. Summary of Training Workshop on the Use of NASA tools for Coastal Resource Management in the Gulf of Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Judd, Chaeli; Judd, Kathleen S.; Gulbransen, Thomas C.; Thom, Ronald M.

    2009-03-01

    A two-day training workshop was held in Xalapa, Mexico from March 10-11 2009 with the goal of training end users from the southern Gulf of Mexico states of Campeche and Veracruz in the use of tools to support coastal resource management decision-making. The workshop was held at the computer laboratory of the Institute de Ecologia, A.C. (INECOL). This report summarizes the results of that workshop and is a deliverable to our NASA client.

  12. Bulletin of Materials Science | Indian Academy of Sciences

    Indian Academy of Sciences (India)

    ... A Sauceda-Carvajal1 P J García-Ramírez1 N Flores-Ramírez2. Centro de Investigación en Micr¸o y Nanotecnología, Universidad Veracruzana, 94292, Boca del Río, Veracruz, México; Faculty of Wood Engineering and Technology, University Michoacana of San Nicolás de Hidalgo, Morelia, Michoacán 58060, México ...

  13. Kaolin from Acoculco (Puebla, Mexico) as a raw material: mineralogical and thermal characterization

    OpenAIRE

    Garcia Vallès, Maite; Pi, T.; Alfonso, P.; Canet, C.; Martínez Manent, Salvador; Jiménez-Franco, A.; Tarragó Aymerich, Mariona; Hernández-Cruz, B.

    2015-01-01

    The present study determined the mineralogy and thermal properties of kaolin from Acoculco (Puebla), at the eastern Trans-Mexican Volcanic Belt and compared it with the nearby deposits of Agua Blanca (Hidalgo) and Huayacocotla (Veracruz). The mineralogy of the kaolins was determined by X-ray diffraction, infrared spectroscopy and scanning electron microscopy. Thermal behaviour was studied by differential thermal analysis, dilatometry and hot-stage microscopy. The Acoculco deposit is composed ...

  14. Frugivores and seed dispersal: mechanisms and consequences for biodiversity of a key ecological interaction

    OpenAIRE

    Jordano, Pedro; Forget, Pierre-Michel; Lambert, Joanna E.; Böhning-Gaese, Katrin; Traveset, Anna; Wright, S. Joseph

    2010-01-01

    The 5th Symposium on Frugivores and Seed Dis- persal, held in Montpellier (France), 13 – 18 June 2010, brought together more than 220 researchers exemplifying a wide diversity of approaches to the study of frugivory and dispersal of seeds. Fol- lowing Ted Fleming and Alejandro Estrada’s initiative in 1985, this event was a celebration of the 25th anniversary of the first meeting in Veracruz, Mexico. Frugivory and seed dispersal are active research areas that hav...

  15. Cartagena : puerto comercial (1533-1800

    Directory of Open Access Journals (Sweden)

    Nicolás del Castillo Mathieu

    1979-02-01

    Full Text Available Dos flotas zarpaban cada año de Sevilla (y en el siglo XVIII de  Cádiz. Se la primera, con destino a Veracruz, en el Virreinato de Nueva España, se separaban algunos pocos barcos para el comercio de las Antillas Mayores y se desgranaban otros dos hacia los puertos de Caballos, Trujillo y Bodegas del Golfo Dulce con el propósito de surtir a Guatemala, Honduras y El Salvador.

  16. Interoceanic occurrence of species of Aristocleidus Mueller, 1936 (Monogenoidea: Dactylogyridae) parasitizing the gills of gerreid fishes in the Neotropics.

    Science.gov (United States)

    Mendoza Franco, Edgar F; Violante-González, Juan; Roche, Dominique G

    2009-09-01

    During investigations of fish parasites in the Neotropics (including the state of Veracruz and the Yucatán Peninsula in the Gulf of Mexico, the Chautengo Lagoon on the Pacific coast of the state of Guerrero in Mexico, and Lake Gatun in the Panama Canal), three monogenoidean (Dactylogyridae) species were found parasitizing the gills of gerreids (Gerreidae): Aristocleidus hastatus Mueller, 1936, was recovered from Eugerres plumieri (Cuvier) and Diapterus auratus Ranzani in Veracruz, from D. auratus and Diapterus rhombeus (Cuvier) in Yucatán, from Eugerres brasilianus (Cuvier) in Panama (all new hosts and geographical records), and from D. peruvianus (Cuvier) and Gerres cinereus (Walbaum) in Guerrero; Aristocleidus lamothei Kritsky and Mendoza-Franco, 2008, was recovered from E. plumieri in Veracruz and from D. rhombeus in Yucatan (new hosts and geographical records), and Aristocleidus sp. was recovered from G. cinereus in Guerrero. Results from this study suggest that species of Aristocleidus exhibit wide host specificity within gerreid fishes and that geminate species within this parasite genus may have originated with the formation of the Isthmus of Panama (3.1 to 3.5 ma). Evidence is also presented suggesting the potential role of the Panama Canal as a passageway allowing the interoceanic dispersal of Aristocleidus species across the isthmus.

  17. Evidence of the presence of the Zika virus in Mexico since early 2015.

    Science.gov (United States)

    Díaz-Quiñonez, José Alberto; López-Martínez, Irma; Torres-Longoria, Belem; Vázquez-Pichardo, Mauricio; Cruz-Ramírez, Edith; Ramírez-González, José Ernesto; Ruiz-Matus, Cuitláhuac; Kuri-Morales, Pablo

    2016-12-01

    To assess the possible circulation of Zika virus (ZIKV) prior to the first documented case in Mexico, we reanalyzed the stored samples from the states of Veracruz and Yucatán, which were originally collected to test for dengue (DENV) and chikungunya (CHIKV) but were negative for these viruses despite the symptomatology. The samples were originally collected between the 30 and 46 epidemiological weeks (EW) when the ZIKV was not yet declared as a Public Health Emergency of International Concern (PHEIC). From the total 4016 negative samples, a total of one hundred samples, 50 from Veracruz (CHIK - DENV - ) and 50 from Yucatán (4 CHIK - DENV - and 46 CHIK - or DENV - ), were tested for Zika virus by using RT-PCR. Results showed that in Veracruz and Yucatán, 20 % (10/50) and 70 % (35/50) were, respectively, ZIKV positive, indicating unequivocally the presence of ZIKV at least since July 2015. We also tested non-confirmed suspect measles cases from early 2015 for ZIKV by RT-PCR. Remarkably in 11 Mexican states, 86 % (18/21) were positive with the earlier symptoms onset as early as May 2015. Finally, RT-PCR analyses on RNA extracted from Aedes aegypti mosquitoes captured from January to March 2015 showed the presence of ZIKV, strongly suggesting that the vector was already carrying the virus at the start of 2015.

  18. The Taste in Veracruzan Bodies: Culinary and Sexual Rhetorics and Practices

    Directory of Open Access Journals (Sweden)

    Flores Martos, Juan Antonio

    2009-06-01

    Full Text Available This contribution is framed on the theory and current anthropology of the senses, and in particular, tries to explore the sense of taste —the sensual taste— in the urban culture of Veracruz, Mexico. The article is an ethnographic study about the place that rhetorics and practices, related to food and sex, have in the society and social imagination from Veracruz. For this purpose, I take as reference my fieldwork during the 90s in this city. Stories and discourses are analyzed in an approach to understand the singular and hegemonic “cosmo-tasting” among the people from Veracruz. I focus my analysis on sociability, gastronomy and sexuality that engage the senses in veracruzan daily life. In particular, I study the sensory as identity rhetoric, the veracruzan meals as cultural world maps, the ambigu taste, the compound pleasure and the libertine taste from veracruzan males. Finally, I identify the main categories of morphological Veracruzan taste

    Esta contribución se enmarca en la teoría y corriente de la antropología de los sentidos, y en particular, intenta explorar el sentido del gusto —el gusto sensual— en la cultura urbana de Veracruz, México. El artículo es un estudio etnográfico sobre el lugar que las retóricas y prácticas referidas a comidas y al sexo tienen en la sociedad e imaginación social veracruzana, a partir de mi trabajo de campo realizado en los años 90 en esta ciudad. Historias y discursos diferentes son analizados en una aproximación para comprender la “gustación del mundo” hegemónica y singular entre las gentes de Veracruz. Centro mi análisis en los campos de la sociabilidad, la gastronomía y la sexualidad que comprometen los sentidos en la vida cotidiana veracruzana. De modo especial, estudio lo sensorial como retórica identitaria, los platos veracruzanos como mapamundis culturales, el gusto de ambigú y el placer compuesto y el gusto libertino de los varones veracruzanos

  19. Geochemical partitioning of lead in biogenic carbonate sediments in a coral reef depositional environment

    International Nuclear Information System (INIS)

    Horta-Puga, Guillermo

    2017-01-01

    The fate of trace elements in reef depositional environments has not been extensively investigated. The aim of this study was to determine the partitioning of Pb in sediments of the Veracruz Reef System, and its relation to local environmental sources. Lead was determined in four geochemical fractions: exchangeable (3.8 ± 0.4 μg g −1 ), carbonate (57.0 ± 13.6 μg g −1 ), organic matter (2.0 ± 0.9 μg g −1 ), and mineral (17.5 ± 5.4 μg g −1 ). For the mineral fraction, lead concentrations were higher in those reefs influenced by river discharge or by long-distance transport of terrigenous sediments. The bioavailable concentration of lead (range: 21.9–85.6 μg g −1 ) indicates that the Veracruz Reef System is a moderately polluted area. As expected, the carbonate fraction contained the highest proportion of Pb (70%), and because the reef framework is largely made up of by biogenic carbonate sediments, hence, it is therefore the most important repository of Pb in coral reef depositional environments. - Highlights: • Lead concentrations were determined in four geochemical fractions of reef sediments. • The carbonate fraction accounted for > 70% of the content of Pb in reef sediments. • Terrigenous sediments are the main source of Pb associated to the mineral fraction. • The Veracruz Reef System is considered a moderately polluted area. • Sediments are the main repositories of lead in coral reef depositional environments.

  20. Selection and geographic isolation influence hummingbird speciation: genetic, acoustic and morphological divergence in the wedge-tailed sabrewing (Campylopterus curvipennis

    Directory of Open Access Journals (Sweden)

    Ornelas Juan

    2011-02-01

    Full Text Available Abstract Background Mesoamerica is one of the most threatened biodiversity hotspots in the world, yet we are far from understanding the geologic history and the processes driving population divergence and speciation for most endemic taxa. In species with highly differentiated populations selective and/or neutral factors can induce rapid changes to traits involved in mate choice, promoting reproductive isolation between allopatric populations that can eventually lead to speciation. We present the results of genetic differentiation, and explore drift and selection effects in promoting acoustic and morphological divergence among populations of Campylopterus curvipennis, a lekking hummingbird with an extraordinary vocal variability across Mesoamerica. Results Analyses of two mitochondrial genes and ten microsatellite loci genotyped for 160 individuals revealed the presence of three lineages with no contemporary gene flow: C. c. curvipennis, C. c. excellens, and C. c. pampa disjunctly distributed in the Sierra Madre Oriental, the Tuxtlas region and the Yucatan Peninsula, respectively. Sequence mtDNA and microsatellite data were congruent with two diversification events: an old vicariance event at the Isthmus of Tehuantepec (c. 1.4 Ma, and a more recent Pleistocene split, isolating populations in the Tuxtlas region. Hummingbirds of the excellens group were larger, and those of the pampa group had shorter bills, and lineages that have been isolated the longest shared fewer syllables and differed in spectral and temporal traits of a shared syllable. Coalescent simulations showed that fixation of song types has occurred faster than expected under neutrality but the null hypothesis that morphological divergence resulted from drift was not rejected. Conclusions Our phylogeographic analyses uncovered the presence of three Mesoamerican wedge-tailed sabrewing lineages, which diverged at different time scales. These results highlight the importance of the

  1. Intelligent investment; Inversion inteligente

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2007-06-15

    In this presentation the company called Energia Renovable De Mexico SA de CV (ERDM), shows not only its obtained objectives but also its wanted objectives. This company is manufacturer and consultant of photovoltaic modules. In the first part, it is given a description of the following issues: the beginnings the company, the implemented marketing strategy, the signed agreement between ERDM and Q-CELLS AG in German, the construction of the San Andres Tuxtla's office as well as the PV module, the reasons why this company is considered a leader not only in Mexico but also in Latin America. Then, It is briefly explained the company's mission, which is mainly focused on the network-connected system that are currently allowed according to the Mexican laws. Besides, there are mentioned the key pieces that have made possible the success of this company. At the same time, there are briefly explained the plans for Mexico, in which there are found the use of both photovoltaic systems and wind turbines in order to feed the electric network. Such plans have as targets to reduce the energy cost in Mexico and to open the profitable market to potential investors. Finally, there are mentioned the future plans that are going to help the company's expansion and to improve some issues related to the energy. [Spanish] En esta presentacion la compania Energia Renovable De Mexico S.A. de C.V. (ERDM), describe tanto los objetivos alcanzados como los que desean alcanzar en el futuro, fungiendo no solo como fabricantes sino tambien como consultores de modulos fotovoltaicos. En la primera parte, se da una descripcion de: los inicios de la compania, las estrategias mercadologicas utilizadas, el acuerdo con Q-CELLS, Alemania; la construccion de la oficina de San Andres Tuxtla y del modulo PV, las causas que la han llevado a ser una empresa lider. Enseguida, se explica escuetamente la mision de la compania; ademas, se mencionan las piezas clave que la han llevado al exito

  2. Il y a 150 ans...La triste épopée de la légion belge au Mexique. Histoire et fiction

    OpenAIRE

    Bénit, André

    2015-01-01

    La versión del editor está disponible en: https://publicaciones.unirioja.es/ojs/index.php/cif/article/view/2735 En mars 1864, un appel est lancé dans la presse belge afin de recruter quelque 2000 hommes pour la future légion belge au Mexique. Le premier contingent partira de Saint-Nazaire à destination de Veracruz à la mi-octobre. En principe, ces volontaires étaient destinés à former une garde autour de leur compatriote l’impératrice Charlotte de Belgique. Mais c’était sans compter sur l’...

  3. As time goes by we improve a little more: relationship expectations of young women in Mexico.

    Science.gov (United States)

    Belknap, Ruth Ann

    2010-10-01

    In this qualitative narrative study I explore expectations regarding male-female relationships and perceptions about intimate partner violence (IPV) with young urban women in the state of Veracruz, Mexico. Carol Gilligan's work informed the analysis of the narratives. Themes identified follow: violence at home, resistance, and relational autonomy. The collective story these women tell is that they are familiar with violence in the home, they resist violence and gender inequality, they seek equality in intimate partner relationships, and they plan for futures where the centrality of family is valued in combination with a strong commitment to their own autonomy.

  4. Homogeneity tests for variances and mean test under heterogeneity conditions in a single way ANOVA method

    International Nuclear Information System (INIS)

    Morales P, J.R.; Avila P, P.

    1996-01-01

    If we have consider the maximum permissible levels showed for the case of oysters, it results forbidding to collect oysters at the four stations of the El Chijol Channel ( Veracruz, Mexico), as well as along the channel itself, because the metal concentrations studied exceed these limits. In this case the application of Welch tests were not necessary. For the water hyacinth the means of the treatments were unequal in Fe, Cu, Ni, and Zn. This case is more illustrative, for the conclusion has been reached through the application of the Welch tests to treatments with heterogeneous variances. (Author)

  5. Meiosis in desynaptic-chromosomal restitution mutants in Rhoeo spathacea (Commelinaceae)

    OpenAIRE

    García-Velázquez, Armando

    2008-01-01

    El estudio se llevó a cabo en recolectas de Rhoeo spathacea realizadas en Veracruz, Chiapas, Tabasco, Yucatán, Quintana Roo y Michoacán, México. Las plantas presentaron número diploide de cromosomas (2n=12) en mitosis. En meiosis los individuos formaron anillo y/o cadenas en metafase I, con excepción de varios mutantes desinápticos-RSD (separación de cromosomas apareados). En meiosis de Rhoeo no se observan bivalentes ni hay posibilidades de entrecruzamiento, y consecuentemente no habrá quias...

  6. Meiosis en mutantes desinápticos con restitución cromosómica en rhoeo spathacea (commelinaceae)

    OpenAIRE

    García-Velasquez, Armando

    2009-01-01

    El estudio se llevó a cabo en recolectas de Rhoeo spathacea realizadas en Veracruz, Chiapas, Tabasco, Yucatán, Quintana Roo y Michoacán, México. Las plantas presentaron número diploide de cromosomas (2n=12) en mit...

  7. Metals in some lagoons of Mexico.

    Science.gov (United States)

    Vazquez, F G; Sharma, V K; Alexander, V H; Frausto, C A

    1995-02-01

    The concentrations of metals, Cd, Cu, Fe, Mn, Ni, Pb, and Zn were determined in some lagoons to establish the level of metal pollution. The lagoons studied were Alvarado lagoon, Veracruz; San Andres lagoon, Tamaulipas; and Terminos lagoon, Campeche. The concentrations were determined in water, oyster (Crassostrea virginica), and sediments. Metals were accumulated in either oysters or sediments. Cu and Zn were higher in oysters and Fe and Mn were higher in sediments. The results in water samples were compared with the limit established by the Secretaria de Ecologia and Desarrollo Urbano Report and briefly discussed.

  8. Impacto de los estilos de vida entre cafetaleros y cañeros en la vejez

    Directory of Open Access Journals (Sweden)

    Felipe R. Vázquez Palacios

    2010-09-01

    Full Text Available Este trabajo correlaciona las prácticas agrícolas del café y la caña de azúcar con los estilos de vida, observando la manera en que estos impactan a las personas en edades avanzadas de la parte central de Veracruz, México. La investigación muestra que si bien el café y la caña generan estilos de vida distintos, no generan diferencias sustantivas en la calidad de vida, pero sí diferente concepción y proyecto de vida especialmente en la vejez.

  9. In the Line of Fire: The Construction of Masculinity among Tamaulipan Youth Linked to Drugs Trafficking

    Directory of Open Access Journals (Sweden)

    Rosío Córdova Plaza

    2017-02-01

    Full Text Available This article seeks to examine the conditions in which masculinity is constructed among the young men known as «falcons» engaged in surveillance and security for drug cartels. It analyses the ethnographic experience collected in two scenarios: Ciudad de Mante in the state of Tamaulipas and the Coatzacoalcos prison in Veracruz. We show methods of recruitment and operations, the roles these young men play and what their work means for their gender identities. We also reflect on ethnography in contexts of violence and suggest tools like cyberethnography and websites specializing in the issue with discussion forums, as a direct source of information for individuals outside the law.

  10. Desarrollo regional y competitividad: la agroindustria azucarera en México

    OpenAIRE

    Lisbeily Domínguez Ruvalcaba

    2005-01-01

    En este artículo se hace un análisis de las principales tendencias de la industria azucarera mexicana durante las últimas dos décadas, a fin de entender el desarrollo y evolución competitiva de esta industria en México, bajo los actuales desafíos que le imprime la globalización de los mercados y sus efectos a nivel local-regional. Se estima que esta industria genera cerca de tres millones de empleos directos e indirectos con una fuerte concentración regional en el estado de Veracruz, el cual ...

  11. La inteligencia emocional en jóvenes universitarios de excelencia académica

    OpenAIRE

    Jiménez González, A.U.; López Aguilar, G.O.; Moreno Boa, A.; Arce Parra, I.G.

    2016-01-01

    El presente estudio es un proyecto surgido de la inquietud de establecer los niveles de Inteligencia Emocional en los estudiantes de la Facultad de Pedagogía de la Universidad Veracruzana, campus Poza Rica – Tuxpan, Veracruz, México, que presentan calificaciones de excelencia en su carrera universitaria; esto con la intención de relacionar tal estado emocional con su rendimiento escolar. Al hablar de rendimiento escolar y sobre todo de excelencia académica llegamos a vislumbrar o intuir a par...

  12. La inteligencia emocional en jóvenes universitarios: un estudio descriptivo

    OpenAIRE

    Vera Pedroza, A.; Alejandre Espinosa, M.; Piña Vázquez, D.L.; Segura Hernández, A.

    2016-01-01

    El estudio desarrolla el tema de la inteligencia emocional en estudiantes pertenecientes a la Facultad de Pedagogía de la Universidad Veracruzana, campus Poza Rica-Tuxpan, Veracruz, México; durante el periodo agosto 2015-enero 2016. Siendo el objetivo principal del trabajo determinar el nivel de inteligencia emocional de los alumnos universitarios y su relación en el contexto escolar. La metodología utilizada en el estudio fue de corte cuantitativa-descriptiva, que se caracteriza por recabar ...

  13. Presencia de los géneros Vibrio y Salmonella, y detección de coliformes fecales en almejas del Golfo de México

    OpenAIRE

    Quiñones-Ramírez, Elsa Irma; Vázquez-Salinas, Carlos; Pedroche, Francisco F.; Moreno-Sepúlveda, L.; Rodas-Suárez, O. R.

    2000-01-01

    Los moluscos bivalvos, por su tipo de alimentación y por las zonas elegidas para su cultivo, pueden ser un vehículo de transmisión de microorganismos patógenos. Un total de 260 muestras de almejas obtenidas a lo largo de un ciclo anual, en la porción norte del Estado de Veracruz, Golfo de México, se estudiaron para determinar la presencia de Salmonella spp., Vibrio cholerae y organismos coliformes fecales. La metodología usada fue la recomendada por el Manual de Bacteriología Analítica de la ...

  14. Altitudinal gradient effect on morphometric variation and leaf symmetry of Platanus mexicana Moric

    OpenAIRE

    Dulce Ma. Galván-Hernández; J. Armando Lozada-García; Norma Flores-Estévez; Jorge Galindo-González; S. Mario Vázquez-Torres

    2015-01-01

    La variación morfométrica y simetría foliar de una población de Platanus mexicana se caracterizaron en un gradiente altitudinal ripario del estado de Veracruz. Ocho caracteres morfométricos se evaluaron en 1,800 hojas provenientes de 15 individuos por sitio (70, 200, 600 y 1,700 m de altitud). Las diferencias morfométricas entre sitios (F(24, 5189) = 21.1, P < 0.05) se determinaron con un análisis de funciones discriminantes. Los caracteres relacionados con el largo y ancho de las hojas deter...

  15. On the

    Directory of Open Access Journals (Sweden)

    Aurelio Velázquez Hernández

    2014-01-01

    Full Text Available This paper provides new information on the issue of the treasure carried aboard the "Vita", which unleashed huge political and historical polemics ever since the yatch arrived at Veracruz in March 1939. By recurring to sourced which had been little used and through a deep and detailed examination of the accounting books kept by the Junta de Auxilio a los Republicanos Españoles (JARE: Board for Aiding Spanish Republicans, the author managed to estimate the assets, not only carried aboard the mythical yacht, but of the whole Board.

  16. Measurement of the mass of mercury in electrolytic cells of Chemical Industry of the Istmo s. a. of c. v. Coatzacoalcos Plant, Ver. (Mexico); Determinacion de la masa de mercurio en celdas electroliticas de Industria Quimica del Istmo s. a. de c. v. Planta Coatzacoalcos, Ver

    Energy Technology Data Exchange (ETDEWEB)

    Angeles C, A.; Vizuet G, J.; Herrera M, J. M.; Flores M, J

    2001-01-15

    For the industry of the production of caustic soda and chlorine is commonly use electrolytic cells with mobile electrode of mercury; in the process it gets lost mass, and there is necessity to know the quantity of mercury that exists in each cell. To know the periodic levels of mercury in the 40 electrolytic cells of the Plant of Coatzacoalcos, in the State of Veracruz (Mexico), the investigators of the ININ used the technique of isotopic dilution by mean of the radioactive injection of a radioactive tracer.(Author)

  17. Charpy V, an application in Mat lab

    International Nuclear Information System (INIS)

    Castillo M, J.A.; Torres V, M.

    2003-01-01

    The obtained results with the system Charpy V V 1 designed in Mat lab for the estimate of parameters of three mathematical models are shown. The adjustment of data is used to determine the fracture energy, the lateral expansion and the percentage of ductility of steels coming from the reactor vessels of Laguna Verde, Veracruz. The data come from test tubes type Charpy V of irradiated material and not irradiated. To verify our results they were compared with those obtained by General Electric of data coming from the Laguna Verde nuclear power plant. (Author)

  18. Pugna por el libre comercio en las postrimerías del virreinato: la Nueva Galicia y las Provincias Internas frente a los comerciantes de la ciudad de México, 1811-1818

    OpenAIRE

    Trejo Barajas, Dení

    2014-01-01

    A partir del estudio de caso respecto de cómo se adoptaron medidas coyunturales de libre comercio, tanto en el puerto de San Blas como en otras zonas costeras del noroeste de Nueva España, durante el periodo de la guerra de Independencia, hemos podido dar seguimiento al conflicto desatado entre los comerciantes de los poderosos consulados de México y Veracruz y las autoridades y corporaciones de las regiones noroccidentales de Nueva España. By developing a case study that analyzes how conj...

  19. Los indígenas en ciudades de México: el caso de los mazahuas, otomíes, triquis, zapotecos y mayas

    Directory of Open Access Journals (Sweden)

    Patricia Noemí Vargas Becerra

    2002-01-01

    Full Text Available El presente trabajo sintetiza los resultados de la investigación Perfiles de los Indígenas en Ciudades de México diseñada para conocer las características demográficas, sus condiciones de vida, la persistencia cultural y la cultura de la identidad de los mazahuas, otomíes, triquis, mayas y zapotecos en tres configuraciones urbanas distintas: la gran metrópoli, la ciudad de México y su zona metropolitana; zonas industriales como el corredor industrial Minatitlán-Veracruz, y una ciudad turística: Cancún, Quintana Roo.

  20. Consideraciones sobre el cultivo del aguacate Persea Americana Mill. en Atlixco, Puebla

    Directory of Open Access Journals (Sweden)

    Teresa Reyna Trujillo

    1983-01-01

    Full Text Available The production of avocado Persea americana Mill in our country has been intensified the last years, particularly in some states such as Michoacán, Puebla, Veracruz and others. Specifically in Puebla, there are some counties "municipios", Atlixco among others, where its exploitation represents an important economical fact. Because of this, it is being pretended to increase the surface occupied with that fruit tree. However, its growth and cultivation, has been exposed to a great number of problems, such as the ecologic ones (inadecuate soils, for example and fitopathologic ones mainly, reasons enough to consider the increase of its growth as inadecuate.

  1. Methodology of Integration for Competitive Technical Intelligence with Blue Ocean Strategy: Application to an exotic fruit

    Directory of Open Access Journals (Sweden)

    Marisela Rodríguez Salvador

    2011-12-01

    Full Text Available This article presents a new methodology that integrates Competitive Technical Intelligence with Blue Ocean Strategy. We explore new business niches taking advantage of the synergy that both areas offer, developing a model based on cyclic interactions through a process developed in two stages: Understanding opportunity that arise from idea formulation to decision making and strategic development. The validity of our approach (first stage was observed in the evaluation of an exotic fruit, Anacardium Occidentale, in the South of the State of Veracruz, Mexico with the support of the university ITESM, Campus Monterrey. We identified critical factors for success, opportunities and threats. Results confirm the attractiveness of this crop.

  2. National autonomous university of Mexico RELAP/SCDAPSIM-based plant simulation and training applications to the Laguna Verde NPP

    International Nuclear Information System (INIS)

    Chavez-Mercado, C.; Hohorst, J.K.; Allison, C.M.

    2004-01-01

    The RELAP/SCDAPSIM code, designed to predict the behavior of reactor systems during normal and accident conditions, is being developed by Innovative Systems Software as part of the International SCDAP Development and Training Program (SDTP). This code is being used as the simulator engine for the National Autonomous University of Mexico's Simulation and Training Facility located at the Campus Morelos in Jiutepec, Mexico. This paper describes the RELAP/SCDAPSIM code, the Simulation and Training facility at the National Autonomous University of Mexico, and the application of the training system to the Laguna Verde Nuclear Power Plant located in the Mexican state of Veracruz. (author)

  3. Diseño participativo de intervenciones de promoción de la salud para población con discapacidad. Universidad Veracruzana

    OpenAIRE

    López-Lara, R.; Cinta, D.; Cruz, A.; Cerecedo, C.; Riande, G.; Hannan, C.

    2017-01-01

    Antecedentes: En agosto del 2015, la Secretaría de Salud de Veracruz convocó al Instituto de Salud Pública de la Universidad Veracruzana para intervenir en Tlaltetela, municipio con prevalencia de Ataxia espinocerebelosa superior a la registrada a nivel mundial; estudiantes de la Maestría en Salud Pública del Instituto realizaron un primer diagnóstico de salud y conformaron una Red Comunitaria interesada en mejorar la atención a la salud de las personas afectadas por este trastorno; producto ...

  4. Statistical zonation technique and its application to the San Andres reservoir in the Poza Rica area, Vera Cruz, Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Campa, M F; Romero, M R

    1969-01-01

    A statistical zonation technique developed by J.D. Testerman is presented referring to its application to the San Andres reservoir in the Poza Rica area in Veracruz, Mex. The method is based on a statistical technique which permits grouping of similar values of certain parameter, i.e., porosity, for individual wells within a field. The resulting groups or zones are used in a correlation analysis to deduce whether there is continuity of porosity in any direction. In the San Andres reservoir, there is a continuity of the porous media on NE-SW direction. This is an important fact for the waterflooding project being carried on.

  5. Disfunciones estructurales en subsistemas conyugal, parental y fraternal en familias nucleares: caso de familias cuya esposa-madre estudian en una institución de educación superior

    Directory of Open Access Journals (Sweden)

    Diana Del Socorro Chávez de la Fuente

    2015-05-01

    Full Text Available This investigation about nuclear families and housewife’s wishing to develop professionally was conducted in a medium-sized city in southern Veracruz Mexico. This study on comprehensive-interpretive (qualitative modality presents the families nuclear systems. These families are seriously affected in their parental, fraternal and marital subsystems when the mother incorporates into an institution of higher education. Furthermore, this study offers the methodological process used as well as the results that were found. The effort started with the review of literature, followed by the choice of the theoretical frameworks available in order to approach the phenomenon to know it and intervene it in the future.

  6. ISOLATION AND PATHOGENICITY OF A POSSIBLE Pythium aphanidermatum IN Jatropha Curcas L. NON TOXIC

    Directory of Open Access Journals (Sweden)

    Ofelia Andrea Valdes Rodriguez

    2011-03-01

    A chromista, possible Pythium aphanidermatum, was isolated from severely damage seeds and seedlings recently started from Jatropha curcas L. non toxic seeds sown in the tropical area of Veracruz, Mexico. In order to study pathogenic Pythium aphanidermatum effects over pre-emergent and post-emergent stages, seeds and young seedlings were inoculated with the isolated pathogen, and the chromista showed possible pathogenic activity against pre-emergency and recently started post-emergency; however, statistically significant damaged was not found in older seedlings.   Â

  7. La contabilidad de costos y rentabilidad en la PYME

    OpenAIRE

    García Pérez De Lema, Domingo; Marín Hérnandez, Salvador; Martínez García, Francisco Javier

    2006-01-01

    Este trabajo tiene dos objetivos: por un lado, analizar las características de las empresas que tienen implantado un sistema de contabilidad de costos para la gestión; por otro, verificar empíricamente la relación existente entre el grado de utilización de sistemas de costos sobre el rendimiento de la Pyme. Para ello se realiza un estudio empírico con 1,425 Pyme del estado de Veracruz (México). Las Pyme con un mayor grado de implantación de modelos de costos se caracterizan por...

  8. Charpy V, an application in Mat lab; Charpy V, una aplicacion en Matlab

    Energy Technology Data Exchange (ETDEWEB)

    Castillo M, J.A.; Torres V, M. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico)

    2003-07-01

    The obtained results with the system Charpy V{sub V}1 designed in Mat lab for the estimate of parameters of three mathematical models are shown. The adjustment of data is used to determine the fracture energy, the lateral expansion and the percentage of ductility of steels coming from the reactor vessels of Laguna Verde, Veracruz. The data come from test tubes type Charpy V of irradiated material and not irradiated. To verify our results they were compared with those obtained by General Electric of data coming from the Laguna Verde nuclear power plant. (Author)

  9. Measurement of the mass of mercury in electrolytic cells of Chemical Industry of the Istmo s. a. of c. v. Coatzacoalcos Plant, Ver. (Mexico)

    International Nuclear Information System (INIS)

    Angeles C, A.; Vizuet G, J.; Herrera M, J. M.; Flores M, J.

    2001-01-01

    For the industry of the production of caustic soda and chlorine is commonly use electrolytic cells with mobile electrode of mercury; in the process it gets lost mass, and there is necessity to know the quantity of mercury that exists in each cell. To know the periodic levels of mercury in the 40 electrolytic cells of the Plant of Coatzacoalcos, in the State of Veracruz (Mexico), the investigators of the ININ used the technique of isotopic dilution by mean of the radioactive injection of a radioactive tracer.(Author)

  10. Ectomycorrhizal association of three Lactarius species with Carpinus and Quercus trees in a Mexican montane cloud forest.

    Science.gov (United States)

    Lamus, Valentina; Montoya, Leticia; Aguilar, Carlos J; Bandala, Victor M; Ramos, David

    2012-01-01

    Ectomycorrhizal (EM) fungi are being monitored in the Santuario del Bosque de Niebla in the central region of Veracruz (eastern Mexico). Based on the comparison of DNA sequences (ITS rDNA) of spatiotemporally co-occurring basidiomes and EM root tips, we discovered the EM symbiosis of Lactarius indigo, L. areolatus and L. strigosipes with Carpinus caroliniana, Quercus xalapensis and Quercus spp. The host of the EM tips was identified by comparison of the large subunit of the ribulose-bisphosphate carboxylase gene (rbcL). Descriptions coupled with photographs of ectomycorrhizas and basidiomes are presented.

  11. AA.VV. Oriente en Granada. Granada: Fundación Caja Rural, 2008, 120 pp. y 69 ils.

    Directory of Open Access Journals (Sweden)

    Cristina Aguado Padial

    2009-12-01

    Full Text Available España, desde el siglo XVI, mantuvo relaciones comerciales con Oriente, siguiendo el itinerario de la Carrera de Indias —partiendo de Sevilla y pasando por Veracruz (México hasta Acapulco, la Nao de la China o Manila, realizando para la vuelta el mismo trayecto, pero a la inversa—, llegando así a nuestro país productos como porcelanas, sedas o marfiles, entre otros...

  12. Los movimientos indígenas de Colombia y los problemas del medió-ambiente

    OpenAIRE

    Espinel Souares, Anastassia

    2003-01-01

    Presentación La multiculturalidad de la Ciudad de México y los Derechos Indígenas Oehmichen, Cristina Conceptos indígenas de la formación territorial y Etno-Político frente al Estado Republicano-Nacional Fischer, Eva Disputas matrimoniales y cambio social en Coyutla, Veracruz (México) Chenaut, Victoria El debate indio sobre la ciudadanía multicultural en México: La revuelta por la dignidad Valladares de la Cruz, Laura Análisis de las actitudes de políticos criollos ...

  13. Análisis de las actitudes de políticos criollos e indígenas en Venezuela (De los años 60 hasta el 2001)

    OpenAIRE

    Clarac de Briceño, Jacqueline

    2003-01-01

    Presentación La multiculturalidad de la Ciudad de México y los Derechos Indígenas Oehmichen, Cristina Conceptos indígenas de la formación territorial y Etno-Político frente al Estado Republicano-Nacional Fischer, Eva Disputas matrimoniales y cambio social en Coyutla, Veracruz (México) Chenaut, Victoria El debate indio sobre la ciudadanía multicultural en México: La revuelta por la dignidad Valladares de la Cruz, Laura Análisis de las actitudes de políticos criollos ...

  14. El debate indio sobre la ciudadanía multicultural en México: La revuelta por la dignidad

    OpenAIRE

    Valladares de la Cruz, Laura R.

    2003-01-01

    Presentación La multiculturalidad de la Ciudad de México y los Derechos Indígenas Oehmichen, Cristina Conceptos indígenas de la formación territorial y Etno-Político frente al Estado Republicano-Nacional Fischer, Eva Disputas matrimoniales y cambio social en Coyutla, Veracruz (México) Chenaut, Victoria El debate indio sobre la ciudadanía multicultural en México: La revuelta por la dignidad Valladares de la Cruz, Laura Análisis de las actitudes de políticos criollos ...

  15. Indices alfabético-temáticos y por años del Boletín Antropológico del Nº 51 al 53

    OpenAIRE

    Rodríguez Lorenzo, Miguel Ángel

    2004-01-01

    Presentación La multiculturalidad de la Ciudad de México y los Derechos Indígenas Oehmichen, Cristina Conceptos indígenas de la formación territorial y Etno-Político frente al Estado Republicano-Nacional Fischer, Eva Disputas matrimoniales y cambio social en Coyutla, Veracruz (México) Chenaut, Victoria El debate indio sobre la ciudadanía multicultural en México: La revuelta por la dignidad Valladares de la Cruz, Laura Análisis de las actitudes de políticos criollos ...

  16. La multiculturalidad de la Ciudad de México y los Derechos Indígenas

    OpenAIRE

    Oehmichen, Cristina

    2003-01-01

    Presentación La multiculturalidad de la Ciudad de México y los Derechos Indígenas Oehmichen, Cristina Conceptos indígenas de la formación territorial y Etno-Político frente al Estado Republicano-Nacional Fischer, Eva Disputas matrimoniales y cambio social en Coyutla, Veracruz (México) Chenaut, Victoria El debate indio sobre la ciudadanía multicultural en México: La revuelta por la dignidad Valladares de la Cruz, Laura Análisis de las actitudes de políticos criollos ...

  17. Conceptos indígenas de la formación territorial y Etno-Político frente al Estado Republicano-Nacional

    OpenAIRE

    Fischer, Eva

    2003-01-01

    Presentación La multiculturalidad de la Ciudad de México y los Derechos Indígenas Oehmichen, Cristina Conceptos indígenas de la formación territorial y Etno-Político frente al Estado Republicano-Nacional Fischer, Eva Disputas matrimoniales y cambio social en Coyutla, Veracruz (México) Chenaut, Victoria El debate indio sobre la ciudadanía multicultural en México: La revuelta por la dignidad Valladares de la Cruz, Laura Análisis de las actitudes de políticos criollos ...

  18. Taxation and Mexican Coffee. The Porfiriato's Strategies for Promoting Coffee Production and Sale (1870-1910

    Directory of Open Access Journals (Sweden)

    Mabel M. Rodríguez Centeno

    2004-07-01

    Full Text Available The author analyzes how Mexican liberal policies for economic development combined with international markets in the late-Nineteenth century.  It focuses on the case of coffee because it clearly  shows  that  the  grower's main incentive  were  the high prices of this product in international markets. The analysis centers on the specific cases of Michoacan, Jalisco, Colima, Oaxaca, Chiapas  and Veracruz,  emphasizing  the central  role of federal and state government  support for expanding coffee production, through fiscal incentives and the development of transportation means.

  19. Promover en los adolescentes la identificación de sus valores como factores que les protegen de las adicciones: un modelo vivencial centrado en el estudiante

    OpenAIRE

    González Flores, María del Pilar; Sevillano García, María Luisa; Rey Yedra, Luis

    2007-01-01

    RESUMEN: En el presente trabajo mostramos una propuesta de intervención surgida de un estudio amplio realizado en la ciudad de Xalapa, Veracruz, México con una muestra representativa de adolescentes no consumidores de sustancias adictivas. Esta propuesta pretende ser una aportación para la identificación y el fortalecimiento de los valores como factor de protección a pesar de la disponibilidad y facilidad de acceso a las drogas en el medio. Diseñamos un programa integral que ayude a los niños...

  20. Modelo de asociatividad en la cadena productiva en las Mipymes agroindustriales

    OpenAIRE

    Bada Carbajal, Lila Margarita; Rivas Tovar, Luis Arturo; Littlewood Zimmerman, Herman Frank

    2017-01-01

    Resumen Esta investigación tiene como objetivo proponer un modelo de asociatividad en cadena productiva de las micro, pequeñas y medianas empresas (MIPYMES) agroindustriales de cítricos en el norte del estado de Veracruz, México, con el propósito de explicar en qué medida los actores directos, los servicios de apoyo, el entorno, las relaciones y las políticas de gobierno determinan la asociatividad en la cadena productiva. La problemática que origina esta investigación es el desconocimiento d...

  1. La inmovilidad de la movilidad de México. El caso de la ciudad de Xalapa

    Directory of Open Access Journals (Sweden)

    José Luis Carrillo Barradas

    2009-05-01

    The present document is about a first approach regarding solutions to urban mobility under an architectural perspective of the city and its urbanism in the field of the Line of Generation and Application of Knowledge, which is named “The System of Cities of the Gulf of Mexico to the Sustainment and the Real Estate Market”. This viewpoint is promoted by the academic team of the Architecture Faculty named “Architecture-City-Territory-Economy” of the University of Veracruz, campus Xalapa. In like matter this document has like a principal aim relate the present analysis to the conceptual and theoretical frame exposed by the author in “Mexico City: An Appeared Megalopolis. The Principal Capital vs the Capital City”; regarding the identification of architectural and urban phenomenon of México in this specific case, the city of Xalapa, Veracruz. As a perspective sponsored by an academic team, this manuscript is also based in the educational experiences lived during the academic exchange between the University of Veracruz and the University of Alcala de Henares (April-May 2005. David Soria Quiroga, José María Rego Bárcena, Darío Pascual Roque and the author of this document followed a line of investigation about urban mobility, systems of collective transport and architecture and urban design in the city of Xalapa, Veracruz, Mexico and their conclusions are exposed here.The paper begins with a conceptual review of global mobility, focuses on the case of Europe and North America, with these two major influences in the urban area for Mexico, followed by an analysis of the evolution of urban planning in Mexico and because urban mobility. Includes the results of the seminar held in November 2005 and other conferences in the field made in Mexico and Technology Seminar, legal and organizational aspects for Transport and Urban Mobility in Mexican cities conducted in April 2006, where the fundamental issue have been conflicts in developing projects that address

  2. Effectiveness of native arbuscular mycorrhizal fungi consortia on coffee plants under greenhouse and field conditions

    OpenAIRE

    TREJO, DORA; FERRERA-CERRATO, RONALD; GARCÍA, ROBERTO; VARELA, LUCÍA; LARA, LILIANA; ALARCÓN, ALEJANDRO

    2011-01-01

    Se probó el efecto de siete consorcios de hongos micorrízicos arbusculares (HMA) aislados de fincas cafetaleras con diferente nivel de tecnología (bajo, medio y alto) del estado de Veracruz, en el crecimiento de plantas de café (Coffea arábica L.) var. Garnica en condiciones de invernadero y de campo. El grado de tecnificación influyó en la composición de especies de HMA, a mayor tecnificación menor número de especies de HMA encontradas. En condiciones de invernadero, los consorcios increment...

  3. Pseudocapillaria (Ichthyocapillaria) ophisterni sp. n. (Nematoda : Capillariidae) from the swamp-eel Ophisternon aenigmaticum (Pisces) in Mexico.

    Science.gov (United States)

    Moravec, F; Salgado-Maldonado, G; Jiménez-García, I

    2000-04-01

    A new nematode species, Pseudocapillaria ophisterni sp. n., is described from the intestine and rarely from the stomach of the swamp-eel, Ophisternon aenigmaticum Rosen et Greenwood, from Catemaco Lake, Veracruz, Mexico. In having both caudal lobes in the male interconnected by a distinct dorsal membrane, it belongs to the subgenus Ichthyocapillaria. It differs from the three species in this subgenus mainly in possessing either a distinctly longer spicule or a smaller length of oesophagus relative to body length. It also differs in host type and geographical distribution. P. ophisterni is the first capillariid species reported from synbranchiform fishes.

  4. Desarrollo morfológico e histológico del sistema reproductor de Pomacea patula catemacensis (Baker 1922) (Mollusca, Caenogastropoda: Ampullariidae) Morphological and histological development of the reproductive system of Pomacea patula catemacensis (Baker 1922) (Mollusca, Caenogastropoda: Ampullariidae)

    OpenAIRE

    AURA CARREÓN-PALAU; ESTHER URIA-GALICIA; FÉLIX ESPINOSA-CHÁVEZ; FERNANDO MARTÍNEZ-JERÓNIMO

    2003-01-01

    El "tegogolo" Pomacea patula catemacensis es un gasterópodo dulceacuícola comestible, endémico del Lago de Catemaco en Veracruz, México. En los últimos años las poblaciones naturales se han visto diezmadas debido a que su captura se realiza sin control, a lo que se suma el alto grado de deterioro ambiental que presenta el lago, producto del "azolvamiento", así como por la contaminación por plaguicidas y detergentes. El objetivo del presente estudio fue caracterizar histológica y morfológicame...

  5. Guatemala como alternativa de desarrollo local

    Directory of Open Access Journals (Sweden)

    Rosa Elba Hernandez Cruz

    2015-01-01

    Full Text Available El área aledaña a la Reserva de la biósfera del Volcán Tacaná, en Chiapas México destaca por la producción de café, además de una alta diversidad de flora y fauna; sin embargo las comunidades rurales que habitan estos espacios están en constante búsqueda de alternativas productivas para mejorar sus medios de vida y cuidar el ambiente el cual está sufriendo deterioro. Ante esta situación se planteó como objetivo la integración de una red de fincas agroecoturísticas en los municipios de Cacahoatán, Tuxtla Chico, Unión Juárez en Chiapas, México y una comunidad en Guatemala. Para construir la propuesta se utilizó la metodología de modos de vida, se realizaron talleres participativos, recorridos en campo y se identificaron los productos turísticos. Se concluye, a partir del análisis de los modos de vida, que la región presenta características y oportunidades para desarrollar la red de agroecoturismo como una alternativa económica.

  6. Differences in diet and activity pattern between two groups of Alouatta palliata associated with the availability of big trees and fruit of top food taxa.

    Science.gov (United States)

    Dunn, Jacob C; Cristóbal-Azkarate, Jurgi; Veà, Joaquím J

    2009-08-01

    The threat that forest fragmentation and habitat loss presents for several Alouatta taxa requires us to determine the key elements that may promote the persistence of howler monkeys in forest fragments and to evaluate how changes in the availability of these elements may affect their future conservation prospects. In this study we analyzed the relationship between the availability of both big trees of top food taxa (BTTFT) (diameter at breast height>60) and fruit of top food taxa (FrTFT) in the home ranges of two groups of Alouatta palliata mexicana occupying different forest fragments in Los Tuxtlas, Mexico, and their diet and activity pattern. Both study groups preferred big trees for feeding and the group with lower availability of BTTFT in their home range fed from more, smaller food sources. Furthermore, both study groups also increased the number of food sources when their consumption of fruit decreased, and the group with lower availability of FrTFT in their home range fed from more food sources. The increase in the number of food sources used under such conditions, in turn, set up a process of higher foraging effort and lower rest. In summary, our results support other studies that suggest that the availability of big trees and fruit may be two important elements influencing the persistence of howler monkeys in forest fragments.

  7. A Late Holocene Record of Human Impact in the Tropical Lowlands of the Mexican Gulf Coast: Lago Verde.

    Science.gov (United States)

    Socorro, L.; Sosa, S.; Caballero, M.; Rodriguez, A.; Ortega, B.

    2005-05-01

    Lago Verde is a maar lake (18 36 43 N; 95 20 52 W) located on the Gulf Coast of Mexico in "Los Tuxtlas" region. The area was cover by tropical rain forest and is part of the core area of the earliest Mesoamerican cultures. A 6 m sediment core was obtained in order to document vegetation and lake level history of this area. Lago Verde is a shallow, eutrophic lake (max. 4 m), the natural vegetation has been removed and grasslands with some tropical trees such Bursera grows around the lake. According with the radiocarbon chronology the sequence covers the last 2500 yr BP. At the base of the sequence low abundance of tropical trees is record, with intermediate lake levels. A sudden change in the pollen stratigraphy occurs at ca. 2000 yr BP, with important presence of Poaceae, Ambrosia and Cheno.-Am. along with Zea mays indicating human activity in the area. This is associated with a change in limnological conditions, recording turbid, shallow environments. This pollen signals correlates with dry phases in Yucatan, suggesting that this dry climatic signal probably had effect on an ample area of Mexico. However, at 1200 yr BP, no more Zea mays pollen is recovered suggesting the abandonment of the area. Lake levels recover as well as the tropical forest. The last 150 yr BP is characterized by the reduction in the pollen of tropical forest trees, presence of Zea mays, increased erosion rates, turbidity and eutrophication in the lake, all related to deforestation.

  8. Removal rates of native and exotic dung by dung beetles (Scarabaeidae: Scarabaeinae) in a fragmented tropical rain forest.

    Science.gov (United States)

    Amézquita, Sandra; Favila, Mario E

    2010-04-01

    Many studies have evaluated the effect of forest fragmentation on dung beetle assemblage structure. However, few have analyzed how forest fragmentation affects the processes carried out by these insects in tropical forests where their food sources consist mainly of dung produced by native herbivore mammals. With the conversion of forests to pastures, cattle dung has become an exotic alternative and abundant food for dung beetles. This study compares dung removal rates of native (monkey) and exotic (cow) dung in different-sized fragments of tropical rain forests, during the dry and rainy seasons at the Los Tuxtlas Biosphere Reserve. Dung removal rates were affected by season, dung type, and the interaction between resource type and season. During the dry season, the removal rates of monkey dung were somewhat similar than during the rainy season, whereas the removal rates of cow dung were much higher during the rainy season. Dung beetle biomass and species richness were almost three times greater in monkey dung than in cow dung. Monkey dung attracted species belonging to the dweller, roller, and tunneler guilds; cow dung attracted mostly tunnelers. Therefore, the use of exotic dung may result in a biased misconception of the rates of dung removal in tropical forest and an underestimation of dung beetle diversity. This study highlights the importance of working with natural tropical forest resources when attempting to identify realistic tendencies concerning processes in natural habitats and those modified by fragmentation and by other human activities.

  9. TV food advertisements' effect on food consumption and adiposity among women and children in Mexico.

    Science.gov (United States)

    Bacardí-Gascón, Montserrat; Díaz-Ramírez, Glenda; Cruz López, Brenda; López Zuñiga, Erika; Jiménez-Cruz, Arturo

    2013-11-01

    The objective of the study was to assess the association between TV foods advertisements and the ones consumed by mothers and children, and the body weight of both mother and child, among population from different SES in two Mexican cities. During June through October 2011 in Tijuana and Tuxtla Gutierrez, two national broadcasted channels were recorded during a period of 5 h in the afternoon on working days. Direct interviews were conducted to explore the foods consumed by mothers and their children from January to July 2012. To identify the difference in the number of hours of TV watching, number of TV sets, and the number of advertisements they recalled, a one-way ANOVA was used. An association was observed between the consumption of advertised foods by mothers and the frequency of broadcasted advertising. It was also observed that there was an association between the hours watching TV and BMI of the mothers and BMI Z-score of their children. There was an association between BMI of the mothers and their children and time spent watching TV. The high exposure to TV food advertisements in Mexico may increase the odds for having childhood obesity. Copyright AULA MEDICA EDICIONES 2013. Published by AULA MEDICA. All rights reserved.

  10. Autocuidado de diabetes: una mirada con perspectiva de género

    Directory of Open Access Journals (Sweden)

    Laura Elena Trujillo Olivera

    2011-01-01

    Full Text Available En Tuxtla Gutiérrez, Chiapas, se realizó un estudio cualitativo encaminado a explorar con perspectiva de género las relaciones intergenéricas en grupos domésticos y su influencia en el autocuidado de personas diabéticas. La información emPírica provino de entrevistas en profundidad a algunos enfermos y a una persona cercana. En este caso se propone una categorización de autocuidado basada en lo que ellos manifiestan que hacen para controlar la enfermedad. Se documenta una importante desigualdad en la oportunidad y logros del autocuidado entre los hombres y las mujeres que padecen esta enfermedad. Se abordan las imPlicaciones de dependencia económica de las mujeres, el consumo de bebidas alcohólicas, la violencia doméstica, la división sexual del trabajo y las relaciones de apoyo para el logro del autocuidado.

  11. TRANSFERS BETWEEN GENERATIONS AND GENDERS. THE CASE OF DIABETES MELLITUS TYPE 2 IN A POOR URBAN CONTEXT OF CHIAPAS, MEXICO

    Directory of Open Access Journals (Sweden)

    Emma Zapata-Martelo

    2012-01-01

    Full Text Available The transfer between generations of populations with diabetes mellitus type 2, play an important role in adherence to the treatment or disease control. The objective of the present study is to identify the magnitude, characteristics and reasons of the intergenerational transfers, and their effect on the absence of medical control from those who have diabetes mellitus type 2. The present study is inserted into the project: prevalence of chronic diseases in Chiapas. Epidemiology, social barriers and attention needs in the adult population (ECPA, in the city of Tuxtla Gutierrez, Chiapas; the information was obtained from September 2005 to April 2006. For purposes of the present study were considered people of 40 years and older with diabetes mellitus type 2 previously diagnosed, resulting in the selection of 125 people with those characteristics: 43 men and 82 women. The results showed that approximately 90% of the people received any type of economical or emotional transfer, there is greater support from children to mothers, and the reasons for transfers were mainly voluntary. The effect of emotional support in women it’s greater than in men in the adherence to treatment and disease control.

  12. Importance of riparian remnants for frog species diversity in a highly fragmented rainforest.

    Science.gov (United States)

    Rodríguez-Mendoza, Clara; Pineda, Eduardo

    2010-12-23

    Tropical forests undergo continuous transformation to other land uses, resulting in landscapes typified by forest fragments surrounded by anthropogenic habitats. Small forest fragments, specifically strip-shaped remnants flanking streams (referred to as riparian remnants), can be particularly important for the maintenance and conservation of biodiversity within highly fragmented forests. We compared frog species diversity between riparian remnants, other forest fragments and cattle pastures in a tropical landscape in Los Tuxtlas, Mexico. We found similar species richness in the three habitats studied and a similar assemblage structure between riparian remnants and forest fragments, although species composition differed by 50 per cent. Frog abundance was halved in riparian remnants compared with forest fragments, but was twice that found in pastures. Our results suggest that riparian remnants play an important role in maintaining a portion of frog species diversity in a highly fragmented forest, particularly during environmentally stressful (hot and dry) periods. In this regard, however, the role of riparian remnants is complementary, rather than substitutive, with respect to the function of other forest fragments within the fragmented forest.

  13. CAMBIOS FÍSICOS Y BIOQUÍMICOS DURANTE EL DESARROLLO Y SENESCENCIA DE FRUTOS DE RAMBUTÁN (Nephelium lappaceum L.

    Directory of Open Access Journals (Sweden)

    Juan Francisco Caballero-Pérez

    2011-01-01

    Full Text Available El objetivo de este estudio fue caracterizar los cambios físicos y bioquímicos durante el crecimiento, desarrollo y etapa postcosecha de los frutos de rambután de tres selecciones sobresalientes de Tuxtla Chico, Chiapas (RI-148, RI-115 y RI-104. Después de antesis se realizaron evaluaciones físicas y químicas en el crecimiento de los frutos y a la cosecha se evaluaron las características de calidad durante seis días a 22 ± 1 ºC y humedad relativa de 65 %. Los resultados mostraron un patrón de crecimiento simple sigmoidal. Durante el desarrollo los frutos de las selecciones RI-148 y RI-115 tuvieron un peso fresco de 39.27 y 35.42 g y un contenido de arilo a la cosecha de 44.28 y 40.90 %, respectivamente, mientras que los del RI-104 fueron de menor tamaño (18.51 g, pero con mayor grosor de pericarpio, mostrando menor susceptibilidad a la oxidación. El número y longitud de espiternos del fruto no parecen determinar el grado de obscurecimiento de éste.

  14. Nitrogen and phosphorus resorption in a neotropical rain forest of a nutrient-rich soil.

    Science.gov (United States)

    Martínez-Sánchez, José Luis

    2005-01-01

    In tropical forests with nutrient-rich soil tree's nutrient resorption from senesced leaves has not always been observed to be low. Perhaps this lack of consistence is partly owing to the nutrient resorption methods used. The aim of the study was to analyse N and P resorption proficiency from tropical rain forest trees in a nutrient-rich soil. It was hypothesised that trees would exhibit low nutrient resorption in a nutrient-rich soil. The soil concentrations of total N and extractable P, among other physical and chemical characteristics, were analysed in 30 samples in the soil surface (10 cm) of three undisturbed forest plots at 'Estaci6n de Biologia Los Tuxtlas' on the east coast of Mexico (18 degrees 34' - 18 degrees 36' N, 95 degrees 04' - 95 degrees 09' W). N and P resorption proficiency were determined from senescing leaves in 11 dominant tree species. Nitrogen was analysed by microkjeldahl digestion with sulphuric acid and distilled with boric acid, and phosphorus was analysed by digestion with nitric acid and perchloric acid. Soil was rich in total N (0.50%, n = 30) and extractable P (4.11 microg g(-1) n = 30). As expected, trees showed incomplete N (1.13%, n = 11) and P (0.11%, n = 1) resorption. With a more accurate method of nutrient resorption assessment, it is possible to prove that a forest community with a nutrient-rich soil can have low levels of N and P resorption.

  15. History of the future; Historia del futuro

    Energy Technology Data Exchange (ETDEWEB)

    Manzini, Fabio [Centro de Investigacion en Energia (CIE) de la UNAM, Temixco, Morelos (Mexico)

    2010-07-01

    The desired future is to imagine a world energized by energy sources that do not infringe against our environmental heritage, because the environment is the determining factor in the equation of human sustainability: without environment there is neither society nor economy. In this document are mentioned the energy reserves in Mexico of uranium as a fuel for the Laguna Verde nuclear power plant, Veracruz; coal, oil and natural gas. It also mentions the renewable resources and existing energy scenarios in Mexico. [Spanish] El futuro deseado es imaginarnos un mundo energizado por fuentes de energia que no atenten en contra de nuestro patrimonio ambiental, porque el ambiente es el factor determinante en la ecuacion de la sustentabilidad humana; sin ambiente no existe ni sociedad ni economia. En este documento se mencionan las reservas energeticas en Mexico de uranio como combustible para la central nuclear Laguna Verde, Veracruz; de carbon, de petroleo y gas natural. Se mencionan tambien los recursos renovables existentes y los escenarios energeticos en Mexico.

  16. Genetic, ecological and morphological divergence between populations of the endangered Mexican Sheartail hummingbird (Doricha eliza.

    Directory of Open Access Journals (Sweden)

    Yuyini Licona-Vera

    Full Text Available The Mexican Sheartail (Doricha eliza, an endangered hummingbird, is endemic to Mexico where two populations have a disjunct distribution. One population is distributed along the northern tip of the Yucatan Peninsula whereas the other is mostly restricted to central Veracruz. Despite their disjunct distribution, previous work has failed to detect morphological or behavioral differences between these populations. Here we use variation in morphology, mtDNA and nuDNA sequences to determine the degree of morphological and molecular divergence between populations, their divergence time, and historical demography. We use species distribution modeling and niche divergence tests to infer the relative roles of vicariance and dispersal in driving divergence in the genus. Our Bayesian and maximum likelihood phylogenetic analyses revealed that Doricha eliza populations form a monophyletic clade and support their sister relationship with D. enicura. We found marked genetic differentiation, with reciprocal monophyly of haplotypes and highly restricted gene flow, supporting a history of isolation over the last 120,000 years. Genetic divergence between populations is consistent with the lack of overlap in environmental space and slight morphological differences between males. Our findings indicate that the divergence of the Veracruz and Yucatan populations is best explained by a combination of a short period of isolation exacerbated by subsequent divergence in climate conditions, and that rather than vicariance, the two isolated ranges of D. eliza are the product of recent colonization and divergence in isolation.

  17. CONTRIBUTION TO THE KNOWLEDGE OF THE AVIFAUNA IN MARIA LIZAMBA AND ASSOCIATED BODIES OF WATER

    Directory of Open Access Journals (Sweden)

    Axel Fuentes-Moreno

    2011-11-01

    Full Text Available The state of Veracruz, Mexico has many water bodies which are used by both men and birds. This study surveyed the avifauna of the lagoons Maria Lizamba, la Piedra, and small sections of the rivers Camaron and Estanzuela in Tierra Blanca, Veracruz. During February 2010 visual surveys of these aquatic habitats were conducted by walking and motorboat, including vegetated areas and surrounding villages. Species were identified by comparing to field guides both visually using binoculars and identification of songs and calls. Forty nine species were documented and comprised 25 families. The most diverse families were the Ardeidae with 7 and Icteridae 6 species respectively. Sixteen families were represented by only a single species. We found 14 species of migratory birds and we found three species (Cathartes burrovianus, Psarocolius montezuma and Campylorhynchus rufinucha rufinucha considered to be at risk status according to the Mexican list of endangered and threatened species (NOM-059-SEMARNAT-2010. The avifauna was similar to that of the Alvarado Lagoon System, with between 17 % and 22 % of the species recently recorded there. The areas surrounding Maria Lizamba are used by numerous species of birds, however many species were aquatic and wintering migratory birds.

  18. Genetic Tracing of Jatropha curcas L. from Its Mesoamerican Origin to the World

    Science.gov (United States)

    Li, Haiyan; Tsuchimoto, Suguru; Harada, Kyuya; Yamasaki, Masanori; Sakai, Hiroe; Wada, Naoki; Alipour, Atefeh; Sasai, Tomohiro; Tsunekawa, Atsushi; Tsujimoto, Hisashi; Ando, Takayuki; Tomemori, Hisashi; Sato, Shusei; Hirakawa, Hideki; Quintero, Victor P.; Zamarripa, Alfredo; Santos, Primitivo; Hegazy, Adel; Ali, Abdalla M.; Fukui, Kiichi

    2017-01-01

    Jatropha curcas L. (Jatropha), a shrub species of the family Euphorbiaceae, has been recognized as a promising biofuel plant for reducing greenhouse gas emissions. However, recent attempts at commercial cultivation in Africa and Asia have failed because of low productivity. It is important to elucidate genetic diversity and relationship in worldwide Jatropha genetic resources for breeding of better commercial cultivars. Here, genetic diversity was analyzed by using 246 accessions from Mesoamerica, Africa and Asia, based on 59 simple sequence repeat markers and eight retrotransposon-based insertion polymorphism markers. We found that central Chiapas of Mexico possesses the most diverse genetic resources, and the Chiapas Central Depression could be the center of origin. We identified three genetic groups in Mesoamerica, whose distribution revealed a distinct geographic cline. One of them consists mainly of accessions from central Chiapas. This suggests that it represents the original genetic group. We found two Veracruz accessions in another group, whose ancestors might be shipped from Port of Veracruz to the Old World, to be the source of all African and Asian Jatropha. Our results suggest the human selection that caused low productivity in Africa and Asia, and also breeding strategies to improve African and Asian Jatropha. Cultivars improved in the productivity will contribute to expand mass commercial cultivation of Jatropha in Africa and Asia to increase biofuel production, and finally will support in the battle against the climate change. PMID:28936216

  19. The decline of cooperation, the rise of competition: developmental effects of long-term social change in Mexico.

    Science.gov (United States)

    García, Camilo; Rivera, Natanael; Greenfield, Patricia M

    2015-02-01

    Using Greenfield's theory of sociocultural change and human development as a point of departure, we carried out two experimental studies exploring the implications of decades of globalised social change in Mexico for children's development of cooperation and competition. In rural San Vicente, Baja California, the baseline was 1970 and the historical comparison took place 40 years later. In Veracruz, the baseline was 1985 and the historical comparison took place 20 years later. In Veracruz, children were tested in both rural and urban settings. We hypothesized that cooperative behavior would decrease in all three settings as a result of the sociocultural transformations of the past decades in Mexico. The Madsen Marble Pull Game was used to assess cooperative and competitive behavior. As predicted by Greenfield's theory of social change and human development, the Marble Pull procedure revealed a striking decrease over time in levels of cooperative behavior, with a corresponding rise in competitive behavior, in all three settings. © 2015 International Union of Psychological Science.

  20. Methodology for the study of the Mexican Volcanic Belt; Metodologia para el estudio del Cinturon Volcanico Mexicano

    Energy Technology Data Exchange (ETDEWEB)

    Pal Verma, Surendra [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1990-12-31

    The Mexican Volcanic Belt (MVB) is an structure 20 to 150 kilometers wide an {approx}1000 km long, oriented approximately east-west, from nearby Puerto Vallarta up until Veracruz; it contains a great number ({approx}7000) of volcanic apparatus or volcanic centers (Verma, 1987a, and the cited references in this paper). Fig. 1 represents the location of some of its main volcanic centers. The MVB forms part of the ring of fire that extends all along the circumpacific region (see Fig. 2) named this way because it refers to a very high volcanoes population (many of them active volcanoes), to its seismic activity and to the large geothermal manifestations. [Espanol] El Cinturon Volcanico Mexicano (CVM) es una estructura de 20 a 150 kilometros de ancho, {approx}1,000 km de largo, orientada aproximadamente este-oeste desde cerca de Puerto Vallarta hasta Veracruz; contiene gran numero ({approx}7,000) de aparatos o centros volcanicos (Verma, 1987a, y las referencias citadas en este trabajo). La figura 1 presenta la localizacion de algunos de sus principales centros volcanicos. El CVM forma parte del llamado anillo del fuego, que se extiende a todo lo largo de la region circumpacifica (vease la Fig. 2), denominada asi porque se trata de una poblacion muy alta de volcanes (mucho de ellos activos), de la actividad sismica y de grandes manifestaciones geotermicas.

  1. LA CAPACITACIÓN COMO PREDICTORA DE SATISFACCIÓN DEL CLIENTE EN ORGANIZACIONES TURÍSTICAS / TRAINING AS PREDICTOR OF CUSTOMER SATISFACTION IN TOURISTIC ORGANIZATIONS

    Directory of Open Access Journals (Sweden)

    Rosa María Sánchez-Hernández

    2011-09-01

    Full Text Available

    La satisfacción del consumidor se refiere a la evaluación de resultados derivados de sus experiencias de consumo. Un predictor de la misma, podría ser la formación del empleado de contacto. El objetivo de este trabajo es analizar el papel predictivo que puede tener dicha formación en la relación calidad del servicio-satisfacción del consumidor. Este estudio consta de una muestra de 43 empleados y 191 clientes de hoteles ubicados en el Estado de Veracruz. Los resultados muestran relación entre el nivel de formación de los empleados y la calidad de servicio percibida por el consumidor y, consecuentemente, su nivel de satisfacción.

    Abstract

    Customer satisfaction refers to the evaluation of results from the consumer experiences. A predictor of customer satisfaction could be the training of the contact employee. The aim of this paper is to analyze the predictive role that training can have on the value of the “service quality”-“customer satisfaction” relation. The sample of this study consists in 43 employees and 191 customers of hotels located in Veracruz State. The results show correlation between the level of employee training and quality of service perceived by the consumer and, consequently, their level of satisfaction.

  2. El museo móvil El Camino de la Ciencia como promotor de la divulgación científica y la apropiación social del conocimiento científico

    Directory of Open Access Journals (Sweden)

    Liliana Valdez Córdoba

    2014-01-01

    Full Text Available El museo movil El Camino de la Ciencia constituye un espacio de divulgacion cientifica que tiene por objetivo aproximar a la poblacion del estado de Veracruz, Mexico al conocimiento cientifico y tecnologico, y de esta forma despertar en ninos y jovenes vocaciones cientificas en un futuro, ya que la investigacion cientifica y el desarrollo tecnologico son el principal motor para el desarrollo economico y social de una nacion. El presente trabajo se llevo a cabo en el periodo de noviembre de 2009 a marzo de 2010 en seis diferentes localidades del estado de Veracruz, Mexico, con la finalidad de determinar la contribucion al proceso de apropiacion de la ciencia y tecnologia generado en la poblacion, a traves de la aplicacion de dos encuestas, una previa (indagatoria A al recorrido por el museo para diagnosticar los conocimientos ya presentes en los asistentes y otra posterior a el para la evaluacion de los conocimientos adquiridos en el museo (indagatoria B, comparando posteriormente los resultados obtenidos y asi verificar el impacto generado. Las calificaciones promedio de la Indagatoria A y B fueron de 6,29 y 6,80, respectivamente, mostrando diferencias significativas entre los resultados (p=0,010, lo que sugiere la asimilacion de la informacion brindada a partir de la visita al museo movil El Camino de la Ciencia. Palabras clave: Museo movil; Divulgacion cientifica; Asimilacion del conocimiento; Apropiacion social de la ciencia.

  3. Methodology for the study of the Mexican Volcanic Belt; Metodologia para el estudio del Cinturon Volcanico Mexicano

    Energy Technology Data Exchange (ETDEWEB)

    Pal Verma, Surendra [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1991-12-31

    The Mexican Volcanic Belt (MVB) is an structure 20 to 150 kilometers wide an {approx}1000 km long, oriented approximately east-west, from nearby Puerto Vallarta up until Veracruz; it contains a great number ({approx}7000) of volcanic apparatus or volcanic centers (Verma, 1987a, and the cited references in this paper). Fig. 1 represents the location of some of its main volcanic centers. The MVB forms part of the ring of fire that extends all along the circumpacific region (see Fig. 2) named this way because it refers to a very high volcanoes population (many of them active volcanoes), to its seismic activity and to the large geothermal manifestations. [Espanol] El Cinturon Volcanico Mexicano (CVM) es una estructura de 20 a 150 kilometros de ancho, {approx}1,000 km de largo, orientada aproximadamente este-oeste desde cerca de Puerto Vallarta hasta Veracruz; contiene gran numero ({approx}7,000) de aparatos o centros volcanicos (Verma, 1987a, y las referencias citadas en este trabajo). La figura 1 presenta la localizacion de algunos de sus principales centros volcanicos. El CVM forma parte del llamado anillo del fuego, que se extiende a todo lo largo de la region circumpacifica (vease la Fig. 2), denominada asi porque se trata de una poblacion muy alta de volcanes (mucho de ellos activos), de la actividad sismica y de grandes manifestaciones geotermicas.

  4. Nuevos registros estatales y nacionales de escarabajos (Coleoptera: Scarabaeoidea y comentarios sobre su distribución New state and country records of scarab beetles (Coleoptera: Scarabaeoidea and comments on their distribution

    Directory of Open Access Journals (Sweden)

    Miguel Ángel Morón

    2012-09-01

    Full Text Available Se detallan 49 registros estatales nuevos para 38 especies de Geotrupidae, Hybosoridae, Melolonthidae y Scarabaeidae en Coahuila (1, Colima (3, Chiapas (1, Durango (1, Guerrero (1, Guanajuato (5, Hidalgo (4, Jalisco (1, Michoacán (2, Nayarit (2, Oaxaca (1, Querétaro (8, San Luis Potosí (10, Sonora (1, Tlaxcala (3, Tamaulipas (1, Veracruz (1, Zacatecas (1 y Distrito Federal (2. Se registran por primera vez Amithao cavifrons (Burmeister para Guatemala (El Petén y Leucothyreus femoratus Burmeister para Nicaragua (Granada. Mediante la elaboración de los trazos individuales de las especies analizadas se discute la congruencia de la distribución de cada especie con patrones biogeográficos previamente observados en Scarabaeoidea y otros grupos de coleópteros.Forty nine new state records of 38 species of Geotrupidae, Hybosoridae, Melolonthidae and Scarabaeidae are listed for Coahuila (1, Colima (3, Chiapas (1, Durango (1, Guerrero (1, Guanajuato (5, Hidalgo (4, Jalisco (1, Michoacán (2, Nayarit (2, Oaxaca (1, Querétaro (8, San Luis Potosí (10, Sonora (1, Tlaxcala (3, Tamaulipas (1, Veracruz (1, Zacatecas (1, and Distrito Federal (2. Two new country records for Amithao cavifrons (Burmeister in Guatemala (El Peten and Leucothyreus femoratus Burmeister in Nicaragua (Granada are also listed. Based on the individual tracks of the species analyzed, the congruence of the distribution of every species with previously observed biogeographic patterns in Scarabaeoidea and other beetle groups is discussed.

  5. Establishment of Aedes aegypti (L.) in mountainous regions in Mexico: Increasing number of population at risk of mosquito-borne disease and future climate conditions.

    Science.gov (United States)

    Equihua, Miguel; Ibáñez-Bernal, Sergio; Benítez, Griselda; Estrada-Contreras, Israel; Sandoval-Ruiz, César A; Mendoza-Palmero, Fredy S

    2017-02-01

    The study was conducted in the central region of Veracruz Mexico, in the metropolitan area of Xalapa. It is a mountainous area where Aedes aegypti (L.) is not currently endemic. An entomological survey was done along an elevation gradient using the Ae. aegypti occurrences at different life cycle stages. Seven sites were sampled and a total of 24 mosquito species were recorded: 9 species were found in urban areas, 18 in non-urban areas with remnant vegetation, and 3 occurred in both environments. Ae. aegypti was found only in the urban areas, usually below 1200m a.s.l., but in this study was recorded for the first time at 1420m a.s.l. These occurrences, together with additional distribution data in the state of Veracruz were used to developed species distribution models using Maxlike software in R to identify the current projected suitable areas for the establishment of this vector and the human populations that might be affected by dengue transmission at higher elevations. Its emergence in previously unsuitable places appears to be driven by both habitat destruction and biodiversity loss associated with biotic homogenization. A border study using data from the edges of the vector's distribution might allow sensitive monitoring to detect any changes in this mosquito's distribution pattern, and any changes in the anthropic drivers or climate that could increase transmission risk. Copyright © 2016 Elsevier B.V. All rights reserved.

  6. THE MAY 23TH 2007 GULF OF MEXICO EARTHQUAKE

    Science.gov (United States)

    Yamamoto, J.; Jimenez, Z.

    2009-12-01

    On the 23th of May 2007 at 14:09 local time (19:09 UT) an insolated earthquake of local magnitude 5.2 occurred offshore northern Veracruz in the Gulf of Mexico. The seismic focus was located using local and regional data at 20.11° N, 97.38° W and 7.8 km depth at 175 km distance from Tuxpan a city of 134,394 inhabitants. The earthquake was widely felt along the costal states of southern Tamaulipas and Veracruz in which several schools and public buildings were evacuated. Neither Laguna Verde nuclear plant, located approximately 245 km from the epicenter, nor PEMEX petroleum company reported damage. First-motion data indicates that the rupture occurred as strike slip faulting along two possible planes, one oriented roughly north-south and the other east-west. In the present paper a global analysis of the earthquake is made to elucidate its origin and possible correlation with known geotectonic features of the region.

  7. Leucismo en la musaraña de orejas cortas Cryptotis mexicana (Mammalia: Soricomorpha, endémica de México Leucism in Mexican small-eared shrew Cryptotis mexicana (Mammalia: Soricomorpha, endemic to Mexico

    Directory of Open Access Journals (Sweden)

    Lázaro Guevara

    2011-06-01

    Full Text Available El leucismo es la reducción de la pigmentación parcial o total del pelaje, pero que mantiene la coloración normal de los ojos y la piel. Aquí se presenta el registro de un individuo de la musaraña endémica de México Cryptotis mexicana recolectado en Veracruz, México, que presenta esta condición. Esta coloración, considerada anormal en estado silvestre, puede incrementar la presión de selección sobre esos individuos. Además, es un reflejo indirecto de la baja variabilidad genética en las poblaciones naturales.Leucism is the partial or complete reduction of the fur pigmentation where eyes and skin maintain their normal coloration. In this paper, we report the record of an individual of the endemic Mexican shrew Cryptotis mexicana from Veracruz, México, that displays leucism. This lack of pigmentation, uncommon in the wild, may result in negative selective pressure on these mammals. Moreover, this genetic-based condition reflects on the low levels of genetic variability within natural populations.

  8. Genetic Tracing of Jatropha curcas L. from Its Mesoamerican Origin to the World

    Directory of Open Access Journals (Sweden)

    Haiyan Li

    2017-09-01

    Full Text Available Jatropha curcas L. (Jatropha, a shrub species of the family Euphorbiaceae, has been recognized as a promising biofuel plant for reducing greenhouse gas emissions. However, recent attempts at commercial cultivation in Africa and Asia have failed because of low productivity. It is important to elucidate genetic diversity and relationship in worldwide Jatropha genetic resources for breeding of better commercial cultivars. Here, genetic diversity was analyzed by using 246 accessions from Mesoamerica, Africa and Asia, based on 59 simple sequence repeat markers and eight retrotransposon-based insertion polymorphism markers. We found that central Chiapas of Mexico possesses the most diverse genetic resources, and the Chiapas Central Depression could be the center of origin. We identified three genetic groups in Mesoamerica, whose distribution revealed a distinct geographic cline. One of them consists mainly of accessions from central Chiapas. This suggests that it represents the original genetic group. We found two Veracruz accessions in another group, whose ancestors might be shipped from Port of Veracruz to the Old World, to be the source of all African and Asian Jatropha. Our results suggest the human selection that caused low productivity in Africa and Asia, and also breeding strategies to improve African and Asian Jatropha. Cultivars improved in the productivity will contribute to expand mass commercial cultivation of Jatropha in Africa and Asia to increase biofuel production, and finally will support in the battle against the climate change.

  9. Genetic Tracing of Jatropha curcas L. from Its Mesoamerican Origin to the World.

    Science.gov (United States)

    Li, Haiyan; Tsuchimoto, Suguru; Harada, Kyuya; Yamasaki, Masanori; Sakai, Hiroe; Wada, Naoki; Alipour, Atefeh; Sasai, Tomohiro; Tsunekawa, Atsushi; Tsujimoto, Hisashi; Ando, Takayuki; Tomemori, Hisashi; Sato, Shusei; Hirakawa, Hideki; Quintero, Victor P; Zamarripa, Alfredo; Santos, Primitivo; Hegazy, Adel; Ali, Abdalla M; Fukui, Kiichi

    2017-01-01

    Jatropha curcas L. (Jatropha), a shrub species of the family Euphorbiaceae, has been recognized as a promising biofuel plant for reducing greenhouse gas emissions. However, recent attempts at commercial cultivation in Africa and Asia have failed because of low productivity. It is important to elucidate genetic diversity and relationship in worldwide Jatropha genetic resources for breeding of better commercial cultivars. Here, genetic diversity was analyzed by using 246 accessions from Mesoamerica, Africa and Asia, based on 59 simple sequence repeat markers and eight retrotransposon-based insertion polymorphism markers. We found that central Chiapas of Mexico possesses the most diverse genetic resources, and the Chiapas Central Depression could be the center of origin. We identified three genetic groups in Mesoamerica, whose distribution revealed a distinct geographic cline. One of them consists mainly of accessions from central Chiapas. This suggests that it represents the original genetic group. We found two Veracruz accessions in another group, whose ancestors might be shipped from Port of Veracruz to the Old World, to be the source of all African and Asian Jatropha. Our results suggest the human selection that caused low productivity in Africa and Asia, and also breeding strategies to improve African and Asian Jatropha. Cultivars improved in the productivity will contribute to expand mass commercial cultivation of Jatropha in Africa and Asia to increase biofuel production, and finally will support in the battle against the climate change.

  10. Design of a hydraulic microturbine type Michell-Banki; Diseno de una microturbina hidraulica tipo Michell-Banki

    Energy Technology Data Exchange (ETDEWEB)

    Lopez Luiz, Norberto; Rodriguez Bautista, Jose; Verduzco Figueroa, Hilario; Gudino Lau, Jorge; Galindo Granados, Miguel angel [Universidad de Colima, Facultad de Ingenieria Electromecanica, Manzanillo, Colima (Mexico)]. E-mail: norberto_lopez@ucol.mx

    2010-11-15

    The aim of this paper is to present the design of a hydraulic microturbine (MTH), which may be installed in areas where supplies are not available for electric power transmission lines, but possessing hydroelectric. MTH's role is to convert hydraulic energy into mechanical work, is coupled to an electric generator, whose function is to convert the mechanical energy into electrical energy. The turbine generator set will produce more electric power the greater the hydroelectric of the area. In southern Mexico, we have great hydroelectric potential, as the case of the states of Veracruz, Chiapas and Oaxaca, which have small causes of rivers where the MTH could be installed and put into operation. [Spanish] El objetivo de este articulo es presentar el diseno de una microturbina hidraulica (MTH), la cual podra ser instalada en zonas donde no se cuente con suministro de energia electrica por medio de lineas de transmision, pero que posean aprovechamientos hidroelectricos. La funcion de la MTH es convertir la energia hidraulica en trabajo mecanico, estara acoplada a un generador electrico, cuya funcion es convertir dicha energia mecanica en energia electrica. El conjunto turbina generador producira mas potencia electrica mientras mayor sea el aprovechamiento hidroelectrico de la zona. En el sur de Mexico contamos con un gran potencial hidroelectrico, como el caso de los estados de Veracruz, Chiapas y Oaxaca, que cuentan con pequenos causes de rios donde las MTH podrian ser instaladas y puestas en operacion.

  11. Mutations in rpoB and katG genes in Mycobacterium isolates from the Southeast of Mexico

    Directory of Open Access Journals (Sweden)

    R Zenteno-Cuevas

    2009-05-01

    Full Text Available The most frequent mutations associated with rifampin and isoniazid resistance in Mycobacterium are the substitutions at codons 531 and 315 in the rpoB and katG genes, respectively. Hence, the aim of this study was to characterize these mutations in Mycobacterium isolates from patients suspected to be infected with drug-resistant (DR pulmonary tuberculosis (TB in Veracruz, Mexico. Drug susceptibility testing of 25 clinical isolates revealed that five were susceptible while 20 (80% were DR (15% of the annual prevalence for Veracruz. Of the DR isolates, 15 (75% were resistant to rifampin, 17 (85% to isoniazid and 15 (75% were resistant to both drugs (MDR. Sequencing analysis performed in the isolates showed that 14 (93% had mutations in the rpoB gene; seven of these (47% exhibited a mutation at 531 (S[L. Ten (58% of the 20 resistant isolates showed mutations in katG; nine (52% of these 10 exhibited a mutation at 315 (S[T. In conclusion, the DR profile of the isolates suggests a significant number of different DR-TB strains with a low frequency of mutation at codons 531 and 315 in rpoB and katG, respectively. This result leads us to consider different regions of the same genes, as well as other genes for further analysis, which is important if a genetic-based diagnosis of DR-TB is to be developed for this region.

  12. Dinámica y efectividad de las fanpages de Facebook de candidatos a gobernador en los resultados electorales (Dynamics and effectiveness of Facebook Fanpages candidates for governor in the election results

    Directory of Open Access Journals (Sweden)

    Jimenez, Carlos

    2016-07-01

    Full Text Available Abstract: In this article analyzes from the perspective of social network analysis, the correlation between metrics structures sampled networks of Facebook fanpage's candidates for governor and the percentage of voting reached. Were taken as an object of study the elections for governor of Nuevo Leon in 2015 and the election for governor of the state of Veracruz in 2016, in Mexico. This research brings us closer to the understanding of the dynamics and effectiveness of fanpage's in election campaigns. Resumen: En el presente artículo se revisa desde un enfoque de análisis de redes sociales, la correlación entre las métricas de las estructuras de redes muestreadas de las fanpage´s de Facebook de candidatos a gobernador y el porcentaje de votación alcanzado. Se tomaron como objeto de estudio las elecciones para gobernador del estado de Nuevo León del 2015 y la elección para gobernador del estado de Veracruz del 2016, en México. La presente investigación nos acerca a la compresión de la dinámica y efectividad de las fanpage´s en las campañas electorales

  13. Statistical analysis of the wind around a nuclear power plant; Analisis estadistico del viento alrededor de una central nucleoelectrica

    Energy Technology Data Exchange (ETDEWEB)

    Tejeda, A; Alvarez, Oscar; Contreras, A. D.; Jauregui, E. [Universidad Veracruzana, (Mexico)

    1996-12-31

    In order to show an appropriate methodology for the climatic analysis of the wind, some of the recent results in the investigation of the field flow around the Laguna Verde Nuclear Power Station, at Veracruz State (Mexico,) through the angular correlation coefficients and contingency tables among the registered wind directions by a meteorological tower at the levels of 10 and 60 meters high are presented. Finally, by applying an objective analysis of the data some conclusions are obtained in connection with the local winds with the mesoscale systems. [Espanol] Con el objeto de mostrar una metodologia apropiada en el analisis climatico del viento, se presentan algunos resultados recientes en la investigacion del campo de flujo en los alrededores de la central nucleoelectrica de Laguna Verde, Veracruz (Mexico), a traves de los coeficientes de correlacion angulares y de tablas de contingencia entre las direcciones del viento registradas por una torre meteorologica en los niveles de 10 y 60 metros de altura. Finalmente, aplicando analisis objetivo de los datos, se obtienen algunas conclusiones sobre la conexion de los vientos locales con los sistemas de mesoescala.

  14. Statistical analysis of the wind around a nuclear power plant; Analisis estadistico del viento alrededor de una central nucleoelectrica

    Energy Technology Data Exchange (ETDEWEB)

    Tejeda, A; Alvarez, Oscar; Contreras, A D; Jauregui, E [Universidad Veracruzana, (Mexico)

    1997-12-31

    In order to show an appropriate methodology for the climatic analysis of the wind, some of the recent results in the investigation of the field flow around the Laguna Verde Nuclear Power Station, at Veracruz State (Mexico,) through the angular correlation coefficients and contingency tables among the registered wind directions by a meteorological tower at the levels of 10 and 60 meters high are presented. Finally, by applying an objective analysis of the data some conclusions are obtained in connection with the local winds with the mesoscale systems. [Espanol] Con el objeto de mostrar una metodologia apropiada en el analisis climatico del viento, se presentan algunos resultados recientes en la investigacion del campo de flujo en los alrededores de la central nucleoelectrica de Laguna Verde, Veracruz (Mexico), a traves de los coeficientes de correlacion angulares y de tablas de contingencia entre las direcciones del viento registradas por una torre meteorologica en los niveles de 10 y 60 metros de altura. Finalmente, aplicando analisis objetivo de los datos, se obtienen algunas conclusiones sobre la conexion de los vientos locales con los sistemas de mesoescala.

  15. [Epidemics and diseases during the Independence period in Mexico].

    Science.gov (United States)

    Viesca-Treviño, Carlos

    2010-01-01

    The epidemics and endemic diseases in Mexico were not a problem before the Independence period. Hunger was less than in the past. The 1806 Influenza epidemics had been forgotten. Measles was considered a benign illness. In 1810, there was an increase in the number of cases of black vomit in Veracruz. Sixty percent of 541 hospitalized patients die of the disease. In 1812, an outbreak of yellow fever spread from Veracruz to Jalapa accompanying the movement of troops and killing over 300 soldiers of the Castilla's Battalion. The appearance of petechial fever, maybe typhus marketed in 1813 the onset of the most important epidemics. The preceding was the indirect effect of war: diseases of prisons and military quarters which became overwhelming in times where the movements of troops and of important groups of populations along with crowing, loss homes, hunger and bad hygiene habits. There was also Influenza or "pestilent cold." Measures of detection and quarantine were taken. "Naranjate" mixed with tartaric cremor was used against fever. Fumigation with nitric acid and burners, where they incinerated gun powder were among the health protection policies. It is noteworthy the advance and relief provided by the introduction of smallpox vaccine, the only preventive mean useful against smallpox which was a breakthrough in public health.

  16. Filogeografía del complejo Caesalpinia hintonii: (Leguminosae: Caesalpinioideae: Poincianella Phylogeography of the Caesalpinia hintonii complex (Leguminosae: Caesalpinioideae: Poincianella

    Directory of Open Access Journals (Sweden)

    Solange Sotuyo

    2010-12-01

    Full Text Available A pesar del crecido número de estudios que se ha realizado para explorar la estructura genética y filogeográfica en especies mexicanas, hay carencia de estudios para especies de selva baja, zonas con alto grado de endemismo. Para un mejor entendimiento de dichas áreas se realizó un estudio filogeográfico y el fechamiento de las especies del complejo Caesalpinia hintonii distribuido en la depresión del río Balsas y el valle de Tehuacán-Cuicatlán. Se determinó la estructura filogeográfica del complejo analizando las secuencias de 4 regiones de plastidio (intrón trnL, espaciador trnL-F, espaciador psbA-trnH y espaciador accD-psaI en todas las poblaciones disponibles. Se estimó la fecha del origen del complejo mediante un método no paramétrico (NPRS. Las diversidades haplotídicas (0.64-1 y las diferencias nucleotídicas (3.8-11.52 en todas las especies fueron altas respecto a valores registrados para otras plantas. Las poblaciones de C. oyamae, morfológicamente indistintas están genéticamente estructuradas y presentan 3 haplogrupos donde el flujo génico entre ellos es bajo y se consideraron entidades crípticas. Las poblaciones de C. hintonii son un grupo genéticamente homogéneo a pesar de ser morfológicamente distintas. Las poblaciones de C. macvaughii forman 2 linajes divergentes entre los que existe flujo génico (Nm=1.41. Los eventos de divergencia en 2 grandes linajes al este y oeste del río Balsas pueden explicarse por eventos geológicos. Los resultados indican que el complejo se encuentra bajo divergencia y en algunos casos radiación morfostática.Although many phylogeographic studies have been conducted to analyze the genetic and phylogeographic structure of Mexican species, such studies are nearly absent for plants of dry seasonal forest, precincts with high level of endemism. To better understand this areas, we undertook a phylogeographic study and dating were carried out on the Caesalpinia hintonii complex

  17. Anastrepha ludens and Anastrepha serpentina (Diptera: Tephritidae) do not infest Psidium guajava (Myrtaceae), but Anastrepha obliqua occasionally shares this resource with Anastrepha striata in nature.

    Science.gov (United States)

    Birke, Andrea; Aluja, Martin

    2011-08-01

    This study examined whether economically important fruit fly species Anastrepha ludens (Loew), Anastrepha serpentina (Wiedemann), and Anastrepha obliqua (Macquart) (Diptera: Tephritidae) may opportunistically exploit guavas, Psidium guajava L. (Myrtaceae), growing near preferred natural hosts. We collected 3,459 kg of guavas and 895 kg of other known host species [sour orange, Citrus aurantium L.; grapefruit, Citrus paradisi Macfadyen; mango, Mangifera indica L.; white sapote, Casimiroa edulis La Llave and Lex.; sapote, Pouteria sapota (Jacq.); sapodilla, Manilkara zapota L.; and wild plum, Spondias purpurea L. and Spondias mombin L.] along an altitudinal gradient over a 4-yr period (2006-2009). Plants were growing in sympatry in 23 localities where the guavas are usually infested in the state of Veracruz, M6xico. The guava samples yielded 20,341 Anastrepha spp. pupae in total (overall mean, 5.88 pupae per kg of fruit). Confirming previous reports, Anastrepha fraterculus (Wiedemann) and Anastrepha striata (Schiner) were found heavily infesting guavas in Veracruz. Importantly, although we did not find evidence that A. ludens and A. serpentina are able to attack this valuable commodity, we document for the first time in the agriculturally important state of Veracruz that P. guajava is an alternative natural host plant of A. obliqua. We recovered two fruit in the mango-growing locality of la Vibora, Tlalixcoyan, that harbored larvae of A. striata and A. obliqua. This finding has important practical implications for management of A. obliqua. Over the entire altitudinal gradient, when individual fruit infestation was examined, a dynamic pattern of species dominance was unveiled with guavas growing below 800 m above sea level mainly attacked by A. striata and a progressive replacement with increasing altitude by A. fraterculus. Interestingly, most individual fruit examined (97%) harbored a single species of fruit fly, a finding that may be taken as evidence of

  18. RESISTENCIA A SEQUÍA DE LINEAS Y VARIEDADES DE FRIJOL NEGRO TROPICAL

    Directory of Open Access Journals (Sweden)

    Ernesto Lopez Salinas

    2011-06-01

    Full Text Available Los objetivos de esta investigación fueron: clasificar genotipos de frijol negro por su tolerancia a sequía e identificar los de mayor eficiencia en el rendimiento en condiciones de riego y sequía. Para ello, en invierno-primavera 2008 se condujeron dos experimentos en Medellín de Bravo, Veracruz; uno con riego todo el ciclo y el otro sin riego, a partir del inicio de floración. Se evaluaron nueve líneas, seis variedades y Criollo Arbolito (testigo local en diseño bloques completos al azar con tres repeticiones. Se cuantificó días a madurez fisiológica, producción de materia seca sin grano, vainas por planta, peso de 100 semillas y rendimiento de grano. Se hicieron análisis de varianza por condición de humedad y uno combinado. Como estimadores de eficiencia se utilizaron el índice de susceptibilidad a sequía (ISS y el índice de eficiencia relativa del rendimiento (IER. Con riego, Negro INIFAP, 82L-17-80, Negro Tacaná y Negro Veracruz, fueron los genotipos más productivos con más de 1,0 t ha-1. Con sequía sobresalieron los dos últimos genotipos, más la línea DOR 448, con rendimientos superiores a 400 kg ha-1. El rendimiento bajo sequía en promedio representó el 37,7% con respecto al de riego. Con ISS de 0,71, 0,85 y 0,87, las líneas DOR-448, NGO 17-99 e Icta Ju-97-1, respectivamente, fueron clasificadas como resistentes a sequía. Las variedades Negro Tacaná y Negro Veracruz con valores de IER de 1,67 y 1,47, mostraron la mayor eficiencia en el rendimiento en ambas condiciones de humedad.

  19. Diversidad y mecanismos de dispersión de árboles de la Isla Gorgona y de los bosques húmedos tropicales del Pacífico colombo-ecuatoriano

    Directory of Open Access Journals (Sweden)

    Yockteng Roxana

    1998-03-01

    Full Text Available En este trabajo se hizo una comparación entre la flora de la isla Gorgona (Colombia y la de los bosques del Chocó biogeográfico (Colombia y Ecuador. Para esta comparación se utilizaron curvas de acumulación de especies e índices de riqueza y diversidad, tanto publicadas por diferentes autores o generadas a partir de los inventarios florísticos originales. La riqueza del bosque de la isla Gorgona calculada a partir de curvas especie-área y del índice de diversidad de Shannon fue inferior a la de varios bosques colombianos y ecuatorianos en las tierras bajas del continente. Adicionalmente, el índice de equitabilidad de Shannon en cinco bosques del Pacífico colombo-ecuatoriano fue mayor que el de la isla Gorgona, lo cual sugiere que en los bosques continentales las especies están representados por un número similar de individuos. La ornitocoria fue el mecanismo de dispersión más importante en la isla Gorgona (49.7%, en forma similar a lo encontrado para las islas Galápagos en Ecuador (60 % y para la isla biogeográfica del bosque nublado de la Serranía de la Macuira, Guajira, en el norte de Colombia (51 %. En contraste, la dispersión por mamíferos fue el mecanismo más importante para las especies de árboles del bosque continental de Cabo Corrientes, de Bajo Calima (Colombia y los Tuxtlas (México. A pesar de que los bosques de la Isla Gorgona, no son especialmente ricos en especies, cumplen una importante función protectora de los ecosistemas de coral que rodean la isla. Una reducción de la cobertura boscosa tendría como consecuencia un aumento de las tasa de erosión y avalanchas que afectarían gravemente los ecosistemas marinos, en particular los arrecifes de coral.The flora of the continental Island of Gorgona (Colombia and that of the forests on the Chocó biogeographical region of Colombia and Ecuador were compared with species-area curves and species diversity indexes, either previously published or calculated using

  20. Light-related variation in sapling architecture of three shade-tolerant tree species of the Mexican rain forest Variación arquitectural de árboles juveniles en relación con la luz en tres especies tolerantes a la sombra en una selva húmeda mexicana

    Directory of Open Access Journals (Sweden)

    JOSÉ LUIS MARTÍNEZ-SÁNCHEZ

    2008-09-01

    Full Text Available The crown architecture of three shade-tolerant tree species (two subcanopy and one mid-canopy was analyzed in relation to the light regime of the forest understorey. The aim was to examine to which extent shade-tolerant species variate in their crown architecture. Tree saplings (265 between 50 and 300 cm height, and distributed from understorey to variously-sized canopy gaps, were measured for 13 architectural traits in the lowland rain forest of Los Tuxtlas, México. The analysis showed that the three species changed their architecture as light increased but in a different way. No species conformed to the typical wide-crown type expected for shade-tolerant species, and in contrast they presented some traits of light demanding species. The two sub-canopy species tended to adopt a crown form between a narrow- and wide-crown type, and the mid-canopy species showed more traits of a narrow-crown type. The horizontal crown area appeared as the more related trait to the light and sapling height. It is concluded that despite being shade-tolerant, the studied species make use of better-lit environments in the forest understorey. The crown architecture of shade-tolerant species is not as rigid as originally conceived.Se analizó la arquitectura de la copa de tres especies tolerantes a la sombra (dos del sotobosque y una del dosel medio en relación con el ambiente lumínico del sotobosque de la selva. El objetivo fue examinar el grado de variación que presenta la arquitectura de la copa de especies tolerantes a la sombra. Para esto, se midieron 13 variables arquitecturales en 265 árboles juveniles (50-300 cm de altura distribuidos desde sitios de selva madura hasta claros de diversos tamaños, en la selva húmeda tropical de Los Tuxtlas, México. El análisis mostró que las tres especies cambian la arquitectura de su copa a medida que aumenta la disponibilidad de luz, pero de diferente forma. Ninguna especie presentó el típico modelo de copa plana

  1. Uso de internet en el ámbito académico universitario

    Directory of Open Access Journals (Sweden)

    Moisés Ramírez Hernández

    2015-12-01

    Full Text Available Este artículo muestra un análisis sobre el uso de internet en actividades académicas por parte del profesor universitario, como resultado de una investigación en proceso cuyo objetivo es identificar el uso que hace el profesor de las TIC en su proceso de enseñanza. Este estudio combina los enfoques positivista y fenomenológico a través de una metodología mixta. De los instrumentos utilizados para la recolección de la información fueron la encuesta y el grupo de discusión. La muestra fue de 44 profesores de la Licenciatura en Pedagogía de la Región Veracruz, de la Universidad Veracruzana (UV en México. Los resultados apuntan que es conveniente seguir realizando investigaciones en esta área.

  2. Confirmación de la presencia del gavilán caracolero (Rostrhamus sociabilis en Jalisco, México

    Directory of Open Access Journals (Sweden)

    Rubén Pineda-López

    2012-01-01

    Full Text Available Reportamos la presencia del gavilán caracolero (Rostrhamus sociabilis en Jalisco tras observar a un individuo en la desembocadura del río Marabasco. En México, esta especie se circunscribe al sureste del país, Istmo de Tehuantepec, parte de Veracruz, y ocasionalmente en las costas de Chiapas, Guerrero y Colima; su presencia en Colima y Jalisco se ha reportado por observadores de aves. Los reportes de esta especie en Colima, a partir de 1998, se explican por la introducción del caracol Pomacea sp. y la naturaleza semi-nómada de la especie. La presencia de R. sociabilis en Jalisco y Colima es importante ya que incrementa el área de distribución de esta especie sujeta a protección especial por las leyes mexicanas.

  3. The Drift Chambers Handbook, introductory laboratory course (based on, and adapted from, A H Walenta's course notes)

    International Nuclear Information System (INIS)

    Ferreira, Ix-B GarcIa; Herrera, J GarcIa; Villasenor, L

    2005-01-01

    This handbook was written for the Drift Chambers introductory laboratory course to be held at 11th Mexican School of Particles and Fields that will be held at the Universidad Veracruzana on the campus of the University at Xalapa, Veracruz, Mexico. This course intends to introduce drift chambers, which play an important role in particle physics experiments as tracking detectors. We start such laboratory course with a brief review of the physics theoretical background. The experimental setup consists of a single-sided, single-cell drift chamber, a plastic scintillator detector, the standard P-10 gas mixture (90% Ar, 10% CH 4 ) and a collimated 90 Sr source. The measurements on the drift velocity of electrons, its change as a function of a drift field, gas gain and diffusion are performed at this laboratory course

  4. Microstructural characterization of archaeological samples coming from La Venta park, Tabasco, Mexico

    International Nuclear Information System (INIS)

    Espinosa P, M.F.; Rodriguez L, V.; Martinez, G.

    1997-01-01

    The Olmec culture was the first meso american civilization it presents its main establishment at the Veracruz and Tabasco states in Mexico. Owing to in time and to the weathering factors of the region as warmth, acid rain and that great humidity existing in the environment among others that have been provoked great erosion and damage on the pre hispanic monuments. Through Sem technique it was achieved the microstructural characterization of materials which conform the samples that correspond to those monuments where fundamentally feldspars have been found. It was determined the elemental composition of samples through Emission dispersive X-ray diffraction technique, the crystalline phases existing in samples were determined mainly finding feldspars, so of this way it was corroborated those obtained results through Sem. The materials characterization that are part of these pre hispanic monuments of La Ve nta park is essential for its conservation minimizing so the damage to pre hispanic pieces. (Author)

  5. Optimal conditions for taking spectra of coffee beans plasma spectroscopy induced by laser (LIBS)

    International Nuclear Information System (INIS)

    Diaz Guerrero, A. M.; Flores Reyes; Ponce Cabrera, L. V.

    2016-01-01

    Coffee beans, arabica and robusta, from Mexico (Chiapas and Veracruz), Colombia, Kenya and Sumatra were analyzed by Laser-induced breakdown spectroscopy (LIBS). The time delay and pulse energy were varied in order to find the optimal conditions for taking spectra in coffee beans; finding that the increased visibility of the peaks and the lowest electronic background is observed with 1 s and 450 mJ. Spectra were taken in different regions of grain area to confirm its homogeneous composition. It was found that the intensity of the signal Ca is much higher than that of K in African coffee, lower in the coffee of America, and much lower in the coffee from Asia. (Author)

  6. [Distribution of Ecteinascidia turbinata (Ascidiacea: Perophoridae) in mangroves of the Yucatán Peninsula, Mexico].

    Science.gov (United States)

    Carballo, J L

    2000-01-01

    The ascidian Ecteinascidia turbinata synthesizes some of the most promising substances against solid-type tumors, but the only available source are the natural populations of this tunicate, which is reared or collected in different parts of the world. A total of 33 locations were sampled in the Gulf of Mexico and the Yucatan Peninsula. The tunicate was not found in Veracruz, Tabasco and Campeche, but it was well established on mangrove roots in the Yucatan Peninsula where we estimated densities more or less equal to one colony and an average production of 115 g of biomass per lineal meter of mangrove coastline in one location (Río Lagartos). Sustainable management appears to be possible.

  7. Estructura y la ultraestructura del ovario de Cichlasoma urophthalmus (Perciformes: Cichlidae)

    OpenAIRE

    Rubí Viedma; Jonathan Franco; Carlos Bedia; Guadalupe Guedea Fernández; Héctor Barrera Villa Zevallos; Héctor Barrera Escorcia

    2011-01-01

    Se realizó un estudio descriptivo de las gónadas femeninas de Cichlasoma urophthalmus. Las muestras fueron recolectadas en la Laguna de Alvarado Veracruz, México en el período 2007-2008 que incluyó las temporadas de Nortes, Secas y Lluvias. Se extrajeron las gónadas femeninas y una parte se fijó en formol al 4% para su tratamiento por técnica histológica de rutina hematoxilina y Eosina (H-E) y otra parte se procesó para microscopia electrónica de transmisión. Las gónadas se fijaron en glutara...

  8. Birds of the US-Mexico borderlands: Distribution, ecology and conservation

    Science.gov (United States)

    Ruth, Janet M.; Brush, Tim; Krueper, David J.

    2008-01-01

    The concept for this volume began as a scientifi c symposium at the North American Ornithological Conference (NAOC) in Veracruz, Mexico in October 2006. The symposium was entitled “Avian Distributional Change, Anthropogenic Challenges, and Recent Avian Research and Technological Advances within the US–Mexico Border Region,” and was cochaired by two of us (DJK and TB) along with Carol Beardmore (Sonoran Joint Venture) and Bill Howe (USDI Fish and Wildlife Service). In light of the importance of the borderland region for birds and bird conservation, and because of the great need for additional information about this poorly studied region, we have compiled this volume to present new information about bird distribution, ecology, and conservation.

  9. National Report presented by the Mexican United States to satisfy the compromises of the Nuclear Safety Convention

    International Nuclear Information System (INIS)

    1998-01-01

    In order to satisfy to the compromises derived of the ratification by part of the Mexican Government for the Nuclear Safety Convention it is presented this National Report which is based on the directives proposed as a result of the preparatory meetings held in the IAEA Headquarters in the city of Vienna, Austria. This National Report represents a document summary and activities realized at present in relation with the only nuclear facility in Mexico: the Nuclear Power Plant in Laguna Verde, Veracruz. This report consists of two parts: In the first one it is described how have been satisfied each one of the compromises. The second one talks about the Laws and Regulations on nuclear activities in the country. (Author)

  10. La industria maquiladora y la migración interna en México

    OpenAIRE

    Hjorth Boisen, Susann Vallentin

    2009-01-01

    El objetivo de este atículo es analizar la relación entre el desarrollo de la Industria Maquiladora de Exportación (IME), la generación del flujo migratorio del sur de Veracruz hacia Ciudad Juárez iniciado en 1995, algunas de las características y dinámicas particulares de dicho flujo migratorio, y su relación con los mercados laborales locales. La metodología utilizada, fue un amplio trabajo de investigación de campo llevado a cabo en dos temporadas, en el año 2000 y entre los años 2002 y 20...

  11. Nuclear systems of level measurement

    International Nuclear Information System (INIS)

    Lara, A.J.; Cabrera, M.J.

    1992-01-01

    In the industry there are processes in which is necessary to maintain the products level controlled which are handled for their transformation. The majority of such processes and by the operation conditions, they do not admit measure systems of level of invasive type then the application of nuclear techniques for level measurement results a big aid in these cases, since all the system installation is situated beyond frontiers of vessels that contain the product for measuring. In the Department of Nuclear Technology Applications of Mexican Petroleum Institute was developed a level measurement system by gamma rays transmission which operates in the Low Density Polyethylene plant of Petrochemical Complex Escolin at Poza Rica, Veracruz, Mexico. (Author)

  12. RESISTENCIA AL IMPACTO DE LA MADERA DE DIEZ ENCINOS (Quercus MEXICANOS

    Directory of Open Access Journals (Sweden)

    R. Dávalos-Sotelo

    2010-01-01

    Full Text Available Se presentan los valores de resistencia al impacto o tenacidad de la madera de diez especies de encinos mexicanos de los estados de Jalisco, México, Puebla y Veracruz ensayados en condición verde con una máquina tipo FPL. No se detectaron diferencias significativas en los valores entre los individuos de la misma especie que crecen en diferentes estados, por lo que puede establecerse un valor común. Existe un efecto directamente proporcional de la densidad básica sobre la tenacidad, el cual se acentúa al incluir los valores del espesor de la pared celular como una variable independiente adicional en los análisis de regresión múltiple. Finalmente, en este trabajo se incluyen los valores de las características anatómicas, físicas y mecánicas de la madera de Quercus crassipes.

  13. Socio-economic vulnerability to climate change in the central mountainous region of eastern Mexico.

    Science.gov (United States)

    Esperón-Rodríguez, Manuel; Bonifacio-Bautista, Martín; Barradas, Víctor L

    2016-03-01

    Climate change effects are expected to be more severe for some segments of society than others. In Mexico, climate variability associated with climate change has important socio-economic and environmental impacts. From the central mountainous region of eastern Veracruz, Mexico, we analyzed data of total annual precipitation and mean annual temperature from 26 meteorological stations (1922-2008) and from General Circulation Models. We developed climate change scenarios based on the observed trends with projections to 2025, 2050, 2075, and 2100, finding considerable local climate changes with reductions in precipitation of over 700 mm and increases in temperature of ~9°C for the year 2100. Deforested areas located at windward were considered more vulnerable, representing potential risk for natural environments, local communities, and the main crops cultivated (sugarcane, coffee, and corn). Socio-economic vulnerability is exacerbated in areas where temperature increases and precipitation decreases.

  14. BUTREN-RC an hybrid system for the recharges optimization of nuclear fuels in a BWR

    International Nuclear Information System (INIS)

    Ortiz S, J.J.; Castillo M, J.A.; Valle G, E. del

    2004-01-01

    The obtained results with the hybrid system BUTREN-RC are presented that obtains recharges of nuclear fuel for a BWR type reactor. The system has implemented the methods of optimization heuristic taboo search and neural networks. The optimization it carried out with the technique of taboo search, and the neural networks, previously trained, were used to predict the behavior of the recharges of fuel, in substitution of commercial codes of reactor simulation. The obtained recharges of nuclear fuel correspond to 5 different operation cycles of the Laguna Verde Nuclear Power plant, Veracruz in Mexico. The obtained results were compared with the designs of this cycles. The energy gain with the recharges of fuel proposals is of approximately 4.5% with respect to those of design. The time of compute consumed it was considerably smaller that when a commercial code for reactor simulation is used. (Author)

  15. Potencial hortícola de los zapotes negros, Diospyros spp. (Ebenaceae)

    OpenAIRE

    García Díaz, Roger Fabián; Cuevas Sánchez,Jesús Axayacatl; Colinas León, María Teresa; Basurto Peña,Francisco; Zizumbo Villarreal,Daniel

    2015-01-01

    Se exploró el potencial hortícola del género Diospyros (Ebenaceae) mediante análisis biogeográficos, climáticos, morfológicos y etnobotánicos. Los análisis geográficos permitieron identificar las áreas óptimas para la conservación y el aprovechamiento de 20 especies. Con aquellas conocidas como Zapotes Negros, D. nigra y D. Conzattii, se aplicó un análisis climático. Por último se estudió la variabilidad morfológica asociada al nivel de manejo en tres zonas de México. Veracruz y Península de ...

  16. Prohexadiona-Ca, AG3, ANOXA y BA modifican indicadores fisiológicos y bioquímicos en chile Mirador

    OpenAIRE

    Ramírez, H.; Amado-Ramírez, C.; Benavides-Mendoza, A.; Robledo-Torres, V.; Martínez-Osorio, A

    2010-01-01

    El chile Mirador, es un cultivo de gran importancia económica y social en la región de El Mirador, Chicontepec, Veracruz, México. Sin embargo, su producción se ve limitada debido a que en la etapa fenológica de floración se presenta un alto porcentaje en la caída de flor. Esta situación altera adversamente el rendimiento y calidad de frutos. Con base en lo anterior, se estudió el efecto de biorregula-dores en su fisiología y bioquímica. Cuando las plantas alcanzaron el 50% de floración, con u...

  17. STRUCTURAL ECONOMIC CHANGE AND INTERNATIONAL MIGRATION FROM MEXICO AND POLAND

    Science.gov (United States)

    Massey, Douglas S.; Kalter, Frank; Pren, Karen A.

    2010-01-01

    In this article we use uniquely comparable data sets from two very different settings to examine how exogenous economic transformations affect the likelihood and selectivity of international out-migration. Specifically, we use data from the Mexican Migration Project to construct event history files predicting first U.S. trips from seven communities in the state of Veracruz, which until recently sent very few migrants abroad. Similarly, using data from the Polish Migration Project, we derive comparable event history files predicting first trips to Germany from four Polish communities, which also sent few migrants abroad before the 1980s. Our analyses suggest that the onset of structural adjustment in both places had a significant effect in raising the probability of international migration, even when controlling for a set of standard variables specified by other theories to influence migration propensity, such as the size of the binational income gap and various indicators of human and social capital. PMID:21765550

  18. MODELO DE ADMINISTRACIÓN PARA LA OPERACIÓN SUSTENTABLE Y GESTIÓN DE LA CALIDAD EN LAS AGROINDUSTRIAS DE CAFÉ: ESTUDIO DE CASO

    OpenAIRE

    Francisco Espinosa Mejía; Esther Michelena Fernández

    2007-01-01

    La investigación se realizó en la empresa beneficiadora de café del municipio de Coatepec Veracruz, en el marco de referencia de una crisis de producción y socioeconómica por la que cruza la cafeticultura y la industrialización del café en México, la que actualmente opera con un modelo de administración y operación basado en el empirismo, altos costos de operación, bajos índices de productividad, ...

  19. Determination of 137Cs and 60Co pollution in the area of the Laguna Verde Nuclear Power Plant, Mexico

    International Nuclear Information System (INIS)

    Salas Mar, Bernardo

    2015-01-01

    The project 'Radiological Analysis of Environmental Samples in the Gulf of Mexico and the coast of Quintana Roo', had the aim of identifying and quantifying anthropogenic radionuclides in environmental samples consisting of silt, sand and sea water. This paper presents the results of the radiological analysis of these samples, which was made in the multichannel system for gamma spectrometry with hyper-pure germanium detector in the Laboratory of Radiological Analysis of Environmental Samples, located at the Physics Department, Faculty of Sciences, of the Autonomous National University of Mexico (UNAM). The sampled points are along the coast of the contiguous states of Tamaulipas, Veracruz, Tabasco, Campeche, Yucatan and Quintana Roo. This paper presents the qualitative and quantitative concentrations of the main identified anthropogenic radionuclides 60 Co and 137 Cs. (authors)

  20. Sistemas agrosilvopastoriles: una alternativa de desarrollo rural sustentable para el trópico mexicano

    Directory of Open Access Journals (Sweden)

    M. Á. Musálem

    2002-01-01

    Full Text Available Se presenta algunas definiciones de agroforestería, los conceptos y características y la importancia y perspectivas en México. Además, se describe brevemente algunos de los sistemas más importantes en las regiones templadas, tropicales y áridas de México. Así mismo, se ejemplifica con algunos esquemas producto de la investigación reciente aplicados en la región tropical de Puebla y Veracruz y en la zona templada del Estado de México. Así mismo, se enfatiza la aplicación de los sistemas agrosilvopastoriles en las fincas de los pequeños productores en el trópico de México.

  1. Laguna Verde: the nuclear debate in Mexico

    International Nuclear Information System (INIS)

    Weinberg, Bill.

    1987-01-01

    Mexico in planning to start up its first nuclear power station at Laguna Verde in the state of Veracruz (1988). The history of the plant is traced; it should have been finished by 1974. Both the fuel and the technology have been imported from the United States for Laguna Verde. The design, a Mark II Boiling Water Reactor, is controversial and there are doubts as to its safety. Opposition to the plant on safety and environmental grounds has grown. In April 1987 a 'Chernobyl anniversary' demonstration had 10,000 protesters and opponents of the plant are becoming more militant. The main opposition is from environmental and 'Green' groups but also includes intellectuals. However, politically, Mexico would find it embarrassing to cancel the plant and also it wants to be seen as a 'First World' rather than a 'Third World' country. (U.K.)

  2. Spanish Patriotic Groups in Mexico and the 98: Patriotism, Dissidence, and Political Proselytism

    Directory of Open Access Journals (Sweden)

    Aimer Granados

    2000-01-01

    Full Text Available This paper reviews the political activities of the Spanish colony in Mexico during the Porfiriato, regarding the 1895-1898 war be­tween Spain and Cuba and the United States. The author focu­ses on three urban centers with Spanish residents -Mexico City, Veracruz and Merida- and analyzes the subject in relation with the colony's complex ideological, social and material interests. The patriotic activities carried out by the colony until the defeat of 1898 is not explained from the diplomatic viewpoint, which is the most common, but from the creation of  patriotic groups (juntas patrióticas, encouraged by the Spanish embassy and  by institutions such as the Casino, the interests of which were often contrary to those of the Mexican government and even entailed conflicts with Cuban secessionist groups also active in Mexico.

  3. National Report presented by the Mexican United States to satisfy the compromises of the Nuclear Safety Convention; Informe Nacional que presentan los Estados Unidos Mexicanos para satisfacer los compromisos de la Convencion de Seguridad Nuclear

    Energy Technology Data Exchange (ETDEWEB)

    National Commission of Nuclear Safety and Safeguards, Mexico City (Mexico); Federal Commission for Electricity, Mexico City (Mexico)

    1998-12-31

    In order to satisfy to the compromises derived of the ratification by part of the Mexican Government for the Nuclear Safety Convention it is presented this National Report which is based on the directives proposed as a result of the preparatory meetings held in the IAEA Headquarters in the city of Vienna, Austria. This National Report represents a document summary and activities realized at present in relation with the only nuclear facility in Mexico: the Nuclear Power Plant in Laguna Verde, Veracruz. This report consists of two parts: In the first one it is described how have been satisfied each one of the compromises. The second one talks about the Laws and Regulations on nuclear activities in the country. (Author)

  4. PREFACE: The XI Mexican School on Particles and Fields

    Science.gov (United States)

    2005-01-01

    The XI Mexican School on Particles and Fields took place on 2-13 August 2004, in the city of Xalapa, Veracruz, México. The School continued with the tradition of promoting High Energy Physics among the younger generation in Mexico. Thus, it was aimed specifically at graduate students and postdocs. The School consisted of several courses delivered by international experts on subjects of current interest to the scientific community. The length of each course was of six to eight hours, English being the language of instruction. A novelty in this edition of the School was its total duration (two weeks as opposed to one), the number of hours assigned to one subject, and the addition of some experimental courses for the students to overcome their inhibitions of a direct encounter with the equipment and its usage. There were also a few overview talks delivered by local experts on the current status of some of the research fields actively pursued in Mexico. The XI-MSPF was organized by the Particles and Fields Division of the Mexican Physical Society. It was generously sponsored by several institutions: Universidad de Veracruz, Universidad Nacional Autónoma de México, Universidad Michoacana de San Nicolás de Hidalgo, Centro de Investigaciones y Estudios Avanzados del IPN (CINVESTAV) and Consejo Nacional de Ciencia y Tecnología (CONACyT). We are very grateful to Dr Raúl Arias Lovillo, Dr Víctor Manuel Alcaráz Romero, Dr Asdrúbal Flóres López and Mtro Walter Saiz González, head of the Academic Secretariat, Director and Subdirector of the Office of Scientific Research and Director of the Division of Exact Sciences of the University of Veracruz, respectively, for their invaluable support in all senses to our Summer School. We also appreciate the important and useful assistance provided by Dr Rubén Bernardo Morante López, Director of the Museum of Anthropology of Xalapa, and Dr Héctor Coronel Brizio of the Secretariat of Education and Culture of the state of

  5. Gestión de la cadena de suministro de Bimbo

    OpenAIRE

    Riveros Benítez, Ángela; Rodríguez Melo, Ángela Marcela

    2016-01-01

    El presente trabajo es un informe final sobre los procesos de producción, logística y distribución de la empresa Bimbo. El informe está conformado por aspectos teóricos y prácticos, de esta manera, brinda información clara y concreta sobre los antecedentes más importantes de esta organización y su contribución a la productividad del país. La información presentada ha sido recolectada mediante una revisión teórica y una visita a sus instalaciones en Veracruz, México. De esta manera, se han est...

  6. An unusual food plant for Cydia pomonella (Linnaeus (Lepidoptera, Tortricidae in Mexico

    Directory of Open Access Journals (Sweden)

    Alejandro Salinas-Castro

    2014-09-01

    Full Text Available An unusual food plant for Cydia pomonella (Linnaeus (Lepidoptera, Tortricidae in Mexico. Larvae of Cydia pomonella (Linnaeus, 1758 were discovered on floral cones of Magnolia schiedeana (Schltdl, 1864 near the natural reserve of La Martinica, Veracruz, México. Magnolia represents an unusual host for this moth species, which is known throughout the world as the "codling moth", a serious pest of fruits of Rosaceae, especially apples. The larvae were identified using taxonomic keys, and identification was corroborated using molecular markers. Further sampling resulted in no additional larvae, hence, the observation was probably that of an ovipositional error by the female, and M. schiedeana is not at risk of attack by this important moth pest.

  7. Fertility determinants in the oil region of Mexico.

    Science.gov (United States)

    Pick, J B; Tellis, G L; Butler, E W

    1989-01-01

    This study analyzes fertility determinants in the oil region of Mexico, consisting of the states of Veracruz, Tabasco, and Campeche. Data are from the 1980 Mexican census and the unit of analysis is the municipio. The regression models, in which the dependent variables of children ever born and child-woman ratio are examined, reveal religious variables to be most significant, with greater fertility for non-Catholics and persons with no religion than for Catholics. Also of great importance are economic variables. Literacy and urbanization, both "classical" Mexican fertility variables, reduce fertility. There are major differences among three urban/rural and three indigenous language subsamples. Results are discussed vis-a-vis demographic theories and prior research.

  8. BUTREN-RC an hybrid system for the recharges optimization of nuclear fuels in a BWR; BUTREN-RC un sistema hibrido para la optimizacion de recargas de combustible nuclear en un BWR

    Energy Technology Data Exchange (ETDEWEB)

    Ortiz S, J.J.; Castillo M, J.A. [ININ, Carretera Mexico-Toluca Km. 36.5, 52045 Estado de Mexico (Mexico); Valle G, E. del [IPN, ESFM, 07738 Mexico D.F. (Mexico)

    2004-07-01

    The obtained results with the hybrid system BUTREN-RC are presented that obtains recharges of nuclear fuel for a BWR type reactor. The system has implemented the methods of optimization heuristic taboo search and neural networks. The optimization it carried out with the technique of taboo search, and the neural networks, previously trained, were used to predict the behavior of the recharges of fuel, in substitution of commercial codes of reactor simulation. The obtained recharges of nuclear fuel correspond to 5 different operation cycles of the Laguna Verde Nuclear Power plant, Veracruz in Mexico. The obtained results were compared with the designs of this cycles. The energy gain with the recharges of fuel proposals is of approximately 4.5% with respect to those of design. The time of compute consumed it was considerably smaller that when a commercial code for reactor simulation is used. (Author)

  9. A new species of the ghost shrimp genus Lepidophthalmus (Crustacea: Decapoda: Axiidea) from the southwestern Gulf of Mexico.

    Science.gov (United States)

    Felder, Darryl L

    2015-07-13

    A new species of Lepidophthalmus lacking a ventral median sclerite on the second abdominal somite is described from coastal waters of the southwestern Gulf of Mexico. Lepidophthalmus statoni sp. nov., originally recognized only as a unique population in allozyme studies, is sympatric with the ventrally plated species Lepidophthalmus manningi Felder & Staton, 2000, but more closely resembles Lepidophthalmus louisianensis (Schmitt, 1935) from the northern and northwestern Gulf of Mexico. Apparently restricted to intertidal and shallow subtidal tropical waters, the new species is known to range from western Campeche to middle-upper reaches of Veracruz, Mexico. As many members of the genus, it commonly inhabits euryhaline inlets, estuaries, and protected shorelines, including richly organic muddy to clayey sands and sandy muds adjacent to shoreline vegetation. Coloration is documented and discussed as a tool to facilitate field identifications, as are morphological characters.

  10. National Report presented by the Mexican United States to satisfy the compromises of the Nuclear Safety Convention; Informe Nacional que presentan los Estados Unidos Mexicanos para satisfacer los compromisos de la Convencion de Seguridad Nuclear

    Energy Technology Data Exchange (ETDEWEB)

    National Commission of Nuclear Safety and Safeguards, Mexico City (Mexico); Federal Commission for Electricity, Mexico City (Mexico)

    1999-12-31

    In order to satisfy to the compromises derived of the ratification by part of the Mexican Government for the Nuclear Safety Convention it is presented this National Report which is based on the directives proposed as a result of the preparatory meetings held in the IAEA Headquarters in the city of Vienna, Austria. This National Report represents a document summary and activities realized at present in relation with the only nuclear facility in Mexico: the Nuclear Power Plant in Laguna Verde, Veracruz. This report consists of two parts: In the first one it is described how have been satisfied each one of the compromises. The second one talks about the Laws and Regulations on nuclear activities in the country. (Author)

  11. USE OF GUACIMO (Guazuma ulmifolia Lam. AS A FORAGE SOURCE FOR EXTENSIVE LIVESTOCK PRODUCTION IN A TROPICAL AREA OF MEXICO

    Directory of Open Access Journals (Sweden)

    Martha Elena Nava-Tablada

    2009-02-01

    Full Text Available The objective was to study the traditional uses of guacimo (Guazuma ulmifolia Lam, compared to other local forage resources for livestock. The expectative of farmers on the use of trees as alternative sources of forage in Angostillo, Paso de Ovejas, Veracruz, Mexico was also investigated. Data was collected through interviews and direct observation. All farmers practice ranching and 85% combine animal production with crop cultivation; allocating 40% of their land to corn and 60% to dual purpose cattle production. The principal uses of guacimo are as forage, firewood, timber, shade, and living fence posts. Guacimo has the highest value as forage compared to other local fodder trees such as guaje de indio (Leucaena lanceolata S. Watson, espino (Acacia cavenia Mol. and huizache (A. farnesiana Willd.. Farmers showed interest in establishing silvopastoral systems including forage banks using guacimo. However, they foresaw limitations due to a lack of consulting, agronomic training and financial support to establish the crops.

  12. Determination of 137Cs and 60Co pollution in the area of the Laguna Verde Nuclear Power Plant, Mexico.

    Science.gov (United States)

    Salas Mar, Bernardo

    2015-11-01

    The project 'Radiological Analysis of Environmental Samples in the Gulf of Mexico and the coast of Quintana Roo', had the aim of identifying and quantifying anthropogenic radionuclides in environmental samples consisting of silt, sand and sea water. This paper presents the results of the radiological analysis of these samples, which was made in the multichannel system for gamma spectrometry with hyperpure germanium detector in the Laboratory of Radiological Analysis of Environmental Samples, located at the Physics Department, Faculty of Sciences, of the Autonomous National University of Mexico (UNAM). The sampled points are along the coast of the contiguous states of Tamaulipas, Veracruz, Tabasco, Campeche, Yucatan and Quintana Roo. This paper presents the qualitative and quantitative concentrations of the main identified anthropogenic radionuclides (60)Co and (137)Cs. © The Author 2015. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oup.com.

  13. Microstructural characterization of archaeological samples coming from La Venta park, Tabasco, Mexico; Caracterizacion microestructural de muestras arqueologicas procedentes del parque La Venta Tabasco, Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Espinosa P, M.F.; Rodriguez L, V.; Martinez, G. [Instituto Nacional de Investigaciones Nucleares, A.P. 18-1027, 11801 Mexico D.F. (Mexico)

    1997-07-01

    The Olmec culture was the first meso american civilization it presents its main establishment at the Veracruz and Tabasco states in Mexico. Owing to in time and to the weathering factors of the region as warmth, acid rain and that great humidity existing in the environment among others that have been provoked great erosion and damage on the pre hispanic monuments. Through Sem technique it was achieved the microstructural characterization of materials which conform the samples that correspond to those monuments where fundamentally feldspars have been found. It was determined the elemental composition of samples through Emission dispersive X-ray diffraction technique, the crystalline phases existing in samples were determined mainly finding feldspars, so of this way it was corroborated those obtained results through Sem. The materials characterization that are part of these pre hispanic monuments of La Ve nta park is essential for its conservation minimizing so the damage to pre hispanic pieces. (Author)

  14. EL CONCEPTO DE LEY NATURAL COMO INSTRUMENTO INTEGRADOR EN EL IMAGINARIO NOVOHISPANO

    Directory of Open Access Journals (Sweden)

    Virginia Aspe Armella

    2013-11-01

    Full Text Available The present research is about what was understood by Natural Law by the most relevant thinkers of XVI century New Spain. The author tries to prove that, due to the concept of Natural Law, the suppression of the eurocentric perspective regarding the nahuas’ uses and customs was facilitated. Doubtless, not all thinkers of that time had the same interpretation of this concept. Authors such as Juan Ginés de Sepulveda interpreted it in a civilizational way, while others like Alonso de la Veracruz and Bartolomé de las Casas interpreted it from a modal perspective. These latter authors were the ones that, due to such perspective, were able to oppose concepts such as slavery and barbarism.

  15. Juventud indígena en el Totonacapan Veracruzano

    Directory of Open Access Journals (Sweden)

    Ariel García Martínez

    2012-01-01

    Full Text Available El artículo pretende dar a conocer la especificidad de la juventud indígena de Totonacapan, su incorporación a la sociedad adulta y su interacción a través de un comparativo que toma como punto de partida la integración de los poblados pertenecientes a la sierra de Papantla, en el norte del estado de Veracruz, con el resto de la sociedad nacional. El trabajo intenta reconstruir el surgimiento de los “jóvenes indígenas” totonacos como producto de la interacción con su propia cultura y la cultura nacional en las cuatro últimas décadas.

  16. Gulf of Mexico Regional Collaborative Final Report

    Energy Technology Data Exchange (ETDEWEB)

    Judd, Kathleen S. [Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Judd, Chaeli [Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Engel-Cox, Jill A. [Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Gulbransen, Thomas [Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Anderson, Michael G. [Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Woodruff, Dana L. [Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Thom, Ronald M. [Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Guzy, Michael [Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Hardin, Danny [Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Estes, Maury [Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

    2007-12-01

    This report presents the results of the Gulf of Mexico Regional Collaborative (GoMRC), a year-long project funded by NASA. The GoMRC project was organized around end user outreach activities, a science applications team, and a team for information technology (IT) development. Key outcomes are summarized below for each of these areas. End User Outreach; Successfully engaged federal and state end users in project planning and feedback; With end user input, defined needs and system functional requirements; Conducted demonstration to End User Advisory Committee on July 9, 2007 and presented at Gulf of Mexico Alliance (GOMA) meeting of Habitat Identification committee; Conducted significant engagement of other end user groups, such as the National Estuary Programs (NEP), in the Fall of 2007; Established partnership with SERVIR and Harmful Algal Blooms Observing System (HABSOS) programs and initiated plan to extend HABs monitoring and prediction capabilities to the southern Gulf; Established a science and technology working group with Mexican institutions centered in the State of Veracruz. Key team members include the Federal Commission for the Protection Against Sanitary Risks (COFEPRIS), the Ecological Institute (INECOL) a unit of the National Council for science and technology (CONACYT), the Veracruz Aquarium (NOAA’s first international Coastal Ecology Learning Center) and the State of Veracruz. The Mexican Navy (critical to coastal studies in the Southern Gulf) and other national and regional entities have also been engaged; and Training on use of SERVIR portal planned for Fall 2007 in Veracruz, Mexico Science Applications; Worked with regional scientists to produce conceptual models of submerged aquatic vegetation (SAV) ecosystems; Built a logical framework and tool for ontological modeling of SAV and HABs; Created online guidance for SAV restoration planning; Created model runs which link potential future land use trends, runoff and SAV viability; Analyzed SAV

  17. Imaginarios culturales en la construcción mítica de las epidemias en américa latina: etnografías críticas del cólera y del dengue en la década de los 90 del siglo XX

    OpenAIRE

    Flores Martos, Juan Antonio

    2009-01-01

    En este artículo se desarrolla una etnografía crítica sobre cómo la prensa construye dos epidemias que afectaron a América Latina en los años 90: el cólera en América Latina y el dengue clásico y hemorrágico en Veracruz (México). Ambos corpus de discursos públicos perfilan dos enfermedades epidémicas muy diferentes de un modo similar, activando en el nivel discursivo los rasgos de las narrativas occidentales de la peste, y en el terreno de las prácticas soc...

  18. Imaginarios culturales en la construcción mítica de las epidemias en América Latina: etnografías críticas del cólera y del dengue en la década de los 90 del siglo XX

    OpenAIRE

    Flores Martos, Juan Antonio

    2009-01-01

    En este artículo se desarrolla una etnografía crítica sobre cómo la prensa construye dos epidemias que afectaron a América Latina en los años 90: el cólera en América Latina y el dengue clásico y hemorrágico en Veracruz (México). Ambos corpus de discursos públicos perfilan dos enfermedades epidémicas muy diferentes de un modo similar, activando en el nivel discursivo los rasgos de las narrativas occidentales de la peste, y en el terreno de las prácticas sociales e intervenciones instituci...

  19. EDITORIAL

    Directory of Open Access Journals (Sweden)

    Juan Antonio Villanueva Jiménez

    2012-11-01

    Full Text Available This special issue of Tropical and Subtropical Agroecosystems presents a selection of the scientific work conducted in recent years in the state of Veracruz, Mexico, associated with its agroecosystems, considering in a wide sense the term “ager” (field. Reviewing research carried out in a defined territory, such as a state, on its contrasting and sometimes complementary productive systems, allows us to visualize the topics on development by its scientific community frequently associated with the problems of a productive chain, the lack of sustainability, contamination affecting the regions and their living beings, the impacts of socioeconomic problems on food production and productivity. In this particular case livestock-related topics dealing with the yield of forages used for cattle grazing are revised, as well as epidemiological and animal-health aspects referring to the presence of paratuberculosis in goats and cryptosporidiosis in calves. As for agricultural aspects, biofertilization with rhizobacteria and mycorrhizal fungi in citrus is presented as an alternative to traditional fertilization; in the case of papaya, the integrated management of its pest mites as well as a participatory methodology to achieve its technological transfer are revised. In addition, the influence that human migration has on the change of land use in a mountain range community is presented, and the eating habits related with the potential practice of horticulture in peri-urban families from the subhumid tropics are revised. Some aquacultural elements are also included, such as the presence of parasitic microorganisms in the oyster depending on the season of the year, the cultivation of tilapia fry in water recirculation systems, basic studies on the genetic improvement of the crayfish, as well as the establishment of a hydroponic-aquaponic system where cultivation of basil and production of Malaysian prawn are combined. As for varied topics, the impact

  20. Home ranges and satellite tactics of male green swordtails (Xiphophorus helleri) in nature.

    Science.gov (United States)

    Franck, D; Klamroth, B; Taebel-Hellwig, A; Schartl, M

    1998-05-01

    Dominance relationships were studied between marked or otherwise individually recognizable male green swordtails in a creek at Lake Catemaco and in a tributary of the Rio Atoyac (Veracruz, Mexico). The Atoyac population is unique because of a high degree of polymorphism, including both macromelanophore spotting and a micromelanophore tailspot pattern. During the dry season males living in the same area maintained a linear social hierarchy for periods of many days. The subordinate males settled down either in the same home ranges or in home ranges largely overlapping with that of dominant males. Although dominant males untiringly chased the subordinate males away, they returned persistently and achieved the status of non-tolerated satellites. Females were less stationary and presumably passed through many male home ranges during their feeding activities. The data clearly demonstrate that green swordtails live in complex social systems in which male-male competition and probably also female mate choice are likely to be essential factors for individual reproductive success.

  1. New observations on Mexiconema cichlasomae (Nematoda: Dracunculoidea) from fishes in Mexico.

    Science.gov (United States)

    Moravec, F; Jiménez-García, M I; Salgado-Maldonado, G

    1998-09-01

    The dracunculoid nematode Mexiconema cichlasomae Moravec, Vidal et Salgado Maldonado, 1992, originally described from the abdominal cavity and viscera of Cichlasoma spp. from Mexico, was recorded from the abdominal cavity of the poeciliid Xiphophorus helleri Heckel in Lake Catemaco and its small tributary Arroyo Agrio, Veracruz and from the intestine of the nurse shark Ginglystoma cirratum (Bonnaterre) off the southern coast of the Gulf of Mexico in Campeche; both these findings represent new host records. The nematode specimens from these hosts are briefly described and illustrated. Whereas X. helleri evidently served as the true definitive host of this parasite, G. cirratum probably acquired Mexiconema infection accidentally while feeding on fish definitive hosts in the brackish or salt-water environment. The ability of M. cichlasomae to utilize fishes of different orders (Perciformes and Cyprinodontiformes) as definitive hosts is rather exceptional among dracunculoid nematodes.

  2. Risk factors connected to gastrointestinal parasites in mantled Alouatta palliata mexicana and black howler monkeys Alouatta pigra living in continuous and in fragmented rainforests in Mexico

    Directory of Open Access Journals (Sweden)

    Genoveva TREJO-MACÍAS, Alejandro ESTRADA

    2012-06-01

    Full Text Available In this study we document the prevalence of gastrointestinal parasites (helminths and protozoans found in fecal samples of populations of Alouatta palliata mexicana and of A. pigra in Los Tuxtlas and in Palenque, southeast Mexico, and its relation to habitat condition, sex/age and season. Nineteen parasite morphotypes were detected in the fecal samples from populations of the two howler monkeys, of which 58% were shared by both species. When considering all parasite species, populations of the two howler species were more likely to be parasitized in fragmented habitat compared to continuous habitat. Individuals of both howler monkey species that lived in fragmented habitat had a higher prevalence of Controrchis biliophilus. A. p. mexicana individuals had a higher prevalence of Trypanoxyuris minutus than A. pigra, probably the result of the larger group sizes found in the former species, and T. minutus was more likely to be found in A. palliata individuals that lived in fragmented habitat. Adult A. p. mexicana males had a higher risk of being parasitized compared to adult females, but these differences were not detected in A. pigra. Parasite species such as Entamoeba sp., Nematoda sp. 28, Nematoda sp. B and Parabronema sp. where only found during the wet season in both howler monkey species. Populations of both howler monkey species had a higher prevalence of Nematoda sp. A in the wet season and Ascaridae eggs were only detected during the wet season in A. pigra. Other parasites detected displayed no clear seasonal pattern [Current Zoology 58 (3: 375-383, 2012].

  3. Equidad entre niñas y niños: situaciones didácticas

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    Antonio Paoli

    2010-01-01

    Full Text Available Este artículo presenta cuatro situaciones didácticas para la educación primaria, de cuarto y quinto grado en especial, y un conjunto de principios educativos; su finalidad es esclarecer y ejemplificar claves del programa educativo Jugar y vivir los valores (jvlv, orientadas a propiciar la equidad y la armonía entre los géneros. En este trabajo se muestran actividades prácticas que buscan explícitamente favorecer en las aulas la equidad de género: cuentos, canciones, preguntas a los niños para propiciar diálogos y conceptualizaciones surgidas de ellos, tareas familiares y reflexiones sobre la didáctica aplicada en la comunidad educativa, comunidad que incluye a maestros, padres de familia, niños y a todo el personal de la escuela. El Programa jvlv se creó en el Departamento de Educación y Comunicación de la uam-x, y hoy se aplica en más de 1000 primarias oficiales del estado de Chiapas. El programa se experimentó como programa piloto primero en diez jardines de niñas y niños en el año escolar 2001-2002, posteriormente en seis primarias oficiales en 2003-2004 y hoy se desarrolla un nuevo programa piloto en 52 primarias en los municipios de Tuxtla Gutiérrez y Suchiapa. La concepción de equidad se tiende a identificar con la de justicia, entendida como dar beneficio a los demás, al medio ambiente y a uno mismo. La equidad de género supone centrar la atención en hacer bien tanto a hombres como a mujeres, sistemáticamente.

  4. Prevalence and sociodemographic correlates of metabolic syndrome in school-aged children and their parents in nine Mesoamerican countries.

    Science.gov (United States)

    Villamor, Eduardo; Finan, Caitlin C; Ramirez-Zea, Manuel; Roman, Ana Victoria

    2017-02-01

    To ascertain the prevalence and sociodemographic correlates of cardiometabolic risk factors in adults and school-aged children from Mesoamerica. Cross-sectional study with convenience sampling. In adults, metabolic syndrome was defined according to the National Cholesterol Education Program's Adult Treatment Panel III (ATP III) criteria. In children, we calculated a continuous sex- and age-standardized metabolic risk score using variables corresponding to adult ATP III criteria. Metabolic syndrome prevalence in adults and risk score distribution in children were compared across levels of sociodemographic characteristics with use of Poisson and linear regression, respectively. Capital cities of Guatemala, El Salvador, the Dominican Republic, Honduras, Nicaragua, Panama, Costa Rica, the Mexican State of Chiapas (Tuxtla Gutiérrez city) and Belize. Families (n 267), comprising one child aged 7-12 years and their biological parents. The prevalence of metabolic syndrome was 37·9 % among women and 35·3 % among men. The most common component was low HDL cholesterol, 83·3 % in women and 78·9 % in men. Prevalence was positively associated with age. In women, metabolic syndrome was inversely related to education level whereas in men it was positively associated with household food security and height, after adjustment. The metabolic risk score in children was inversely related to parental height, and positively associated with height-for-age and with having parents with the metabolic syndrome. Metabolic syndrome is highly prevalent in Mesoamerica. The burden of metabolic risk factors disproportionately affects women and children of lower socio-economic status and men of higher socio-economic status.

  5. Infant and toddlers' feeding practices and obesity amongst low-income families in Mexico.

    Science.gov (United States)

    Jimenez-Cruz, Arturo; Bacardi-Gascon, Montserrat; Pichardo-Osuna, Alexandra; Mandujano-Trujillo, Zally; Castillo-Ruiz, Octelina

    2010-01-01

    The aim of this study was to determine the risk factors of childhood obesity among infants and toddlers from low-income families from three cities in Mexico. This is a cross-sectional study of mothers and their infants and toddlers attending a vaccination centre at three primary care clinics in Tijuana, Tuxtla, and Reynosa. Anthropometric measurements of the mothers and children were conducted at the clinic and a questionnaire was administered to the mother. Eight-hundred and ten mothers and their 5 to 24 months old infants participated in the study. Average age for the mothers was 24 (21-28) years, and 57% of them were either overweight or obese. The children's average age was 12.7 (5-24) months. Overall overweight prevalence in this sample was 11% and obesity 8%, these increased with age, from 3% for overweight and 6 % for obesity before 6 months, to 13 and 10% between 12 to 24 months respectively. Thirty-five percent of infants were breastfed>or=6 month and 92% were introduced to other solid foods before 6 months. Introduction of high-fat content snacks (HFS) and carbonated and non-carbonated sweetened (CSD) drinks starts before 6 months and more than sixty percent of the children between 12 to 24 months of age were eating HFS and CSD sweetened drinks at least once a week. Consumption of snacks and CSD sweetened drinks (>or=1 week) was associated with being overweight and obese (crude), OR, 1.82; 95% CI=1.24-2.65 (p=0.002). These results suggest that preventive programs should be initiated during pregnancy and continued.

  6. Richness and Abundance of Ichneumonidae in a Fragmented Tropical Rain Forest.

    Science.gov (United States)

    Ruiz-Guerra, B; Hanson, P; Guevara, R; Dirzo, R

    2013-10-01

    Because of the magnitude of land use currently occurring in tropical regions, the local loss of animal species due to habitat fragmentation has been widely studied, particularly in the case of vertebrates. Many invertebrate groups and the ichneumonid wasps in particular, however, have been poorly studied in this context, despite the fact that they are one of the most species-rich groups and play an important role as regulators of other insect populations. Here, we recorded the taxonomic composition of ichneumonid parasitoids and assessed their species richness, abundance, similarity, and dominance in the Los Tuxtlas tropical rain forest, Mexico. We compared two forest types: a continuous forest (640 ha) and a forest fragment (19 ha). We sampled ichneumonids using four malaise traps in both forest types during the dry (September-October) and rainy (March-April) seasons. A total of 104 individuals of Ichneumonidae belonging to 11 subfamilies, 18 genera, and 42 species were collected in the continuous forest and 11 subfamilies, 15 genera, and 24 species were collected in the forest fragment. Species richness, abundance, and diversity of ichneumonids were greater in the continuous forest than in the forest fragment. We did not detect differences between seasons. Species rank/abundance curves showed that the ichneumonid community between the forest types was different. Species similarity between forest types was low. The most dominant species in continuous forest was Neotheronia sp., whereas in the forest fragment, it was Orthocentrus sp. Changes in the ichneumonid wasp community may compromise important tropical ecosystem processes.

  7. A demographic history of a population of howler monkeys (Alouatta palliata living in a fragmented landscape in Mexico

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    Jurgi Cristóbal Azkarate

    2017-08-01

    Full Text Available Long-term field studies are critical for our understanding of animal life history and the processes driving changes in demography. Here, we present long-term demographic data for the northernmost population of mantled howler monkeys (Alouatta palliata residing in a highly anthropogenically fragmented landscape in Los Tuxtlas, Mexico. We carried out 454 monthly group visits to 10 groups of mantled howler monkeys between 2000 and 2011. The population remained relatively stable over the 11-year study period, with an overall increase in the total number of individuals. Birth rates and inter-birth intervals were comparable to those of howler monkeys at non-fragmented sites, suggesting that living in a fragmented landscape did not affect the reproductive output of our study population. Moreover, despite the landscape, dispersal events were commonplace, including many secondary dispersals (individuals emigrating from groups that they had previously immigrated into. Finally, we found a marked effect of seasonality on the dynamics of our study population. In particular, the period of lowest temperatures and resource scarcity between November and March was associated with higher mortality and reproductive inhibition, while the period of resource abundance between April and May was associated with the majority of conceptions and weaning of offspring. This, in turn, could be influencing dispersal patterns in our study area, as male howler monkeys seem to time some of their immigrations into new groups to coincide with the start of the period of higher fertility, while females preferentially joined new groups several months before the onset of this period. These data have important implications for the conservation and management of howler monkeys in fragmented landscapes, as well as for our understanding of the effect of seasonality over howler monkey dispersal, reproduction and survival.

  8. Anthropogenic disturbances jeopardize biodiversity conservation within tropical rainforest reserves.

    Science.gov (United States)

    Martínez-Ramos, Miguel; Ortiz-Rodríguez, Iván A; Piñero, Daniel; Dirzo, Rodolfo; Sarukhán, José

    2016-05-10

    Anthropogenic disturbances affecting tropical forest reserves have been documented, but their ecological long-term cumulative effects are poorly understood. Habitat fragmentation and defaunation are two major anthropogenic threats to the integrity of tropical reserves. Based on a long-term (four decades) study, we document how these disturbances synergistically disrupt ecological processes and imperil biodiversity conservation and ecosystem functioning at Los Tuxtlas, the northernmost tropical rainforest reserve in the Americas. Deforestation around this reserve has reduced the reserve to a medium-sized fragment (640 ha), leading to an increased frequency of canopy-gap formation. In addition, hunting and habitat loss have caused the decline or local extinction of medium and large herbivores. Combining empirical, experimental, and modeling approaches, we support the hypothesis that such disturbances produced a demographic explosion of the long-lived (≈120 y old, maximum height of 7 m) understory palm Astrocaryum mexicanum, whose population has increased from 1,243-4,058 adult individuals per hectare in only 39 y (annual growth rate of ca 3%). Faster gap formation increased understory light availability, enhancing seed production and the growth of immature palms, whereas release from mammalian herbivory and trampling increased survival of seedlings and juveniles. In turn, the palm's demographic explosion was followed by a reduction of tree species diversity, changing forest composition, altering the relative contribution of trees to forest biomass, and disrupting litterfall dynamics. We highlight how indirect anthropogenic disturbances (e.g., palm proliferation) on otherwise protected areas threaten tropical conservation, a phenomenon that is currently eroding the planet's richest repositories of biodiversity.

  9. Design and construction of a live insulator washing system for transformers; Diseno y construccion de un sistema de lavado en vivo para los aisladores de transformadores

    Energy Technology Data Exchange (ETDEWEB)

    Lizama-Camara, Y.A. [Universidad Veracruzana, Veracruz (Mexico)]. E-mail: yahir_lizama@ieee.org; Mendieta-Antunez, J.A.; Blanco-Brisset, E. [Industrias IEM, Tlalnepantla, Estado de Mexico (Mexico)]. E-mail: unamanu@hotmail.com; Olivares Galvan, J.C.; Escarela-Perez, R. [Universidad Autonoma Metropolitana, Unidad Azcapotzalco, Mexico, D.F. (Mexico)]. E-mails: jolivare_1999@yahoo.com; r.escarela@ieee.org

    2012-04-15

    Through the electrical industry history there have been developments of different cleaning methods to avoid the insulators flashover s due to pollution. This paper describes the principal cleaning methods applicable to transformers insulators, emphasizing the high pressure fixed-type live insulator washing method, which was applied for cleaning the insulators of 900 MVA transformer bank of the Laguna Verde power plant localized at the state of Veracruz in Mexico. We propose a transformer insulator cleaning methodology, which identifies the main variables to take into account (the voltage level of the transformers, the pollution level of the insulators, determination of the optimal wash time, the amount of water, the optimal pressure of water jet, the maximum conductivity of the water and the wind velocity), reference values are given for these variables. In addition, we present an economic cost analysis when applying a method of this kind in an electric substation. [Spanish] A lo largo de la historia de la industria electrica se han desarrollado diferentes metodos de limpieza para evitar las fallas de los aisladores de los transformadores debido a la contaminacion. Este articulo describe los principales metodos de limpieza aplicables a los aisladores de transformadores, enfatizando el sistema de lavado en vivo tipo fijo con agua a alta presion, metodo que fue aplicado para realizar la limpieza de los aisladores en el banco de transformadores de 900 MVA de la central electrica Laguna Verde, ubicada en el estado de Veracruz, en Mexico. Se propone una metodologia para la limpieza de los aisladores de transformadores, donde se identifican las principales variables a tomar en cuenta (el nivel de tension de los transformadores, nivel de contaminacion de los aisladores, determinacion del tiempo optimo de lavado, cantidad de precipitacion de agua, presion optima del chorro de agua, maxima conductividad del agua y las velocidades de los vientos) y se dan valores de

  10. Growth status of children 6-12 years from two different geographic regions of Mexico.

    Science.gov (United States)

    Peña Reyes, M E; Cárdenas Barahona, E E; Cahuich, M B; Barragán, A; Malina, R M

    2002-01-01

    The purposes of the study are to assess the growth status of urban Mexican children living in different geographic areas of the country, to estimate the prevalence of overweight and obesity, and to explore secular trends in body size. Cross-sectional surveys of 293 children 6-11 years from Sonora in the north-west of the country (155 boys, 138 girls), and 356 children 7-12 years from Veracruz on the Gulf Coast (194 boys, 162 girls) were undertaken in 1992 and 1993, respectively. Height and weight were measured; the body mass index (BMI, kg m(-2)) was calculated. Growth status was compared to USA reference data and to samples of Mexican children in 1926 and 1975. The prevalence of overweight (BMI > or = 85th and or = 95th percentile) was estimated. Girls and boys from Sonora and Veracruz do not differ in height, weight and the BMI. Mean heights are at (girls) or below (boys) the medians of USA growth charts, while mean weights are at (boys) or just below (girls) the 75th percentiles at most ages. As a result, mean BMIs are above (boys) and below (girls) the 75th percentiles over the age range studied. The prevalence of overweight and obesity is 40% in boys and 35% in girls, whereas the prevalence of obesity per se is 23% in boys and 17% in girls. Compared to urban Mexican children in the Federal District surveyed in 1926, children in the present sample are taller and heavier, but the secular trend in body weight is more pronounced since the mid-1960s. Heights of the current samples are similar to those of well-off children in Mexico City in the early 1970s, but weights are heavier. The gap in height between well-off and lower socioeconomic status children in different regions of Mexico has been reduced, but there is an increase in the prevalence of overweight and obesity.

  11. La familia Apocynaceae sensu lato en México: diversidad y distribución The family Apocynaceae sensu lato in Mexico: diversity and distribution

    Directory of Open Access Journals (Sweden)

    Verónica Juárez-Jaimes

    2007-12-01

    Full Text Available La familia Apocynaceae s.l. se ubica entre las 15 familias más diversas de México, con 385 especies repartidas en 50 géneros y 3 subfamilias, de las cuales Asclepiadoideae es la de mayor diversidad en géneros, especies y endemismos. Los géneros con más especies nativas (y endémicas son Asclepias y Matelea. Los estados más ricos en diversidad de taxones son los ubicados en ambas vertientes; destacan Chiapas, Guerrero, Oaxaca y Veracruz. Por su número de especies, sobresalen el bosque tropical caducifolio y los matorrales xerófilos. Del total de especies, 176 son endémicas de México. Se presenta la lista de especies registradas, señalándose su distribución por estados.Apocynaceae s.l. is among the 15 most diverse families in Mexico, with a total of 385 species, distributed in 50 genera and 3 subfamilies of which Asclepiadoideae is the most diverse in numbers of genera, species and endemics. The genera with the most native species and endemics are Asclepias and Matelea. The richest states in terms of taxon diversity are those at the Pacific and Atlantic slopes, Chiapas, Oaxaca, Guerrero and Veracruz being the most prominent. Tropical deciduous forest and arid tropical scrub are the most important vegetation types by their total number of species, 176 of which are endemic to Mexico. A list of species recorded in México is provided, indicating their state distribution.

  12. Using msa-2b as a molecular marker for genotyping Mexican isolates of Babesia bovis.

    Science.gov (United States)

    Genis, Alma D; Perez, Jocelin; Mosqueda, Juan J; Alvarez, Antonio; Camacho, Minerva; Muñoz, Maria de Lourdes; Rojas, Carmen; Figueroa, Julio V

    2009-12-01

    Variable merozoite surface antigens of Babesia bovis are exposed glycoproteins having a role in erythrocyte invasion. Members of this gene family include msa-1 and msa-2 (msa-2c, msa-2a(1), msa-2a(2) and msa-2b). To determine the sequence variation among B. bovis Mexican isolates using msa-2b as a genetic marker, PCR amplicons corresponding to msa-2b were cloned and plasmids carrying the corresponding inserts were purified and sequenced. Comparative analysis of nucleotide and deduced amino acid sequences revealed distinct degrees of variability and identity among the coding gene sequences obtained from 16 geographically different Mexican B. bovis isolates and a reference strain. Clustal-W multiple alignments of the MSA-2b deduced amino acid sequences performed with the 17 B. bovis Mexican isolates, revealed the identification of three genotypes with a distinct set each of amino acid residues present at the variable region: Genotype I represented by the MO7 strain (in vitro culture-derived from the Mexico isolate) as well as RAD, Chiapas-1, Tabasco and Veracruz-3 isolates; Genotype II, represented by the Jalisco, Mexico and Veracruz-2 isolates; and Genotype III comprising the sequences from most of the isolates studied, Tamaulipas-1, Chiapas-2, Guerrero-1, Nayarit, Quintana Roo, Nuevo Leon, Tamaulipas-2, Yucatan and Guerrero-2. Moreover, these three genotypes could be discriminated against each other by using a PCR-RFLP approach. The results suggest that occurrence of indels within the variable region of msa-2b sequences can be useful markers for identifying a particular genotype present in field populations of B. bovis isolated from infected cattle in Mexico.

  13. El género Hydrophilus (Coleoptera: Hydrophilidae: Hydrophilina en México y Centroamérica The genus Hydrophilus (Coleoptera: Hydrophilidae: Hydrophilina in Mexico and Central America

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    Roberto Arce-Pérez

    2013-03-01

    Full Text Available A partir de la revisión morfológica de 499 ejemplares adultos y datos bibliográficos se actualizó la identidad y la distribución precisa de las especies del género Hydrophilus Geoffroy, 1762 que habitan en México y Centroamérica. Se presenta a H. (Dibolocelus purpuracens Régimbart, 1901 como nuevo registro para México. Las especies más ampliamente distribuidas son H. (H. ensifer Brullé, 1837 en 5 países y las Antillas e H. (H. insularis Castelnau, 1840 en 4 países y las Antillas. Los países con mayor riqueza fueron México con 5 especies, y Nicaragua y Costa Rica con 3 especies. En México el estado con mayor riqueza es Veracruz, y en Nicaragua los departamentos de León y Río San Juan. Se presenta una clave ilustrada para el reconocimiento de las especies.The taxonomy and precise distribution of the species of the genus Hydrophilus Geoffroy, 1762 from Mexico and Central America are reviewed, based on the morphological study of499 adult specimens, descriptions and literature records. Hydrophilus (Dibolocelus purpuracens Régimbart, 1901 is recorded for the first time for Mexico. Species with widest distribution are H. (H. ensifer Brullé, 1837 cited from 5 countries and in the Antilles, and H. (H. insularis Castelnau, 1840 cited from 4 countries and the Antilles. The richest countries are Mexico with 5 species, and Costa Rica and Nicaragua with 3 species. The highest species richness is recorded for the state of Veracruz, Mexico, and from the departments of León and Río San Juan, Nicaragua. An illustrated key to the species is included.

  14. Effect of ivermectin on the survival and fecundity of Euoniticellus intermedius (Coleoptera: Scarabaeidae

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    Magdalena Cruz Rosales

    2012-03-01

    Full Text Available The State of Veracruz in Mexico is one of the main cattle producers, and uses several veterinary products for disease and parasite control. For parasite control, ivermectin is one of the most frequently used substances. Nevertheless, even though previous research conducted in other countries has found that this product has negative effects on beneficial coprophagous fauna, no studies have descry ibed its effects on coprophagous insects at a local scale in Veracruz, Mexico. This study evaluated Euoniticellus intermedius survival, fecundity, fertility and preimaginal development under laboratory conditions when ivermectin was added to cattle dung at three different concentrations. The design included two controls (spiked dung, and the following product concentrations: 0.01, 1.0 and 100ppm, which were homogenized with wet cattle dung. 20 female-male E. intermedius couples between five and 15 days old were used and kept at 27°C, 70% RH, and 12h light for 10 days. The survival of all specimens, the fertility of 20 females and the gonadal maturity of 17 males were verified. The larval development in 162 pieces of brood-mass was examined, and a total of 974 larvae developed and reached adulthood. The highest ivermectin concentration was toxic at 1.0ppm dose, the survival of adults was reduced to almost the half, and at 100ppm, total mortality was observed. The effects on specimen reproductive systems showed that the ovary was not affected, that the testicle size increased, and that the fecundity and weight of brood-masses were reduced. Pre-imaginal development increased 0.5 times at 0.01ppm concentration, and the width of the cephalic capsule in third instar larvae diminished. The prolonging of development time may cause a phase lag in the field activity cycle, this lag may reduce the number of E. intermedius individuals and the efficiency of the environmental services that they provide.

  15. Televisión, actitudes y drogas en adolescentes: investigación sobre sus efectos Television, Attitudes, and Drugs in Adolescents: Research on their Effects

    Directory of Open Access Journals (Sweden)

    Luis Rey Yedra

    2009-10-01

    Full Text Available Los estudios relacionados con el uso de sustancias adictivas recaban, habitualmente, la opinión de los consumidores. En este trabajo presentamos un análisis cualitativo de las respuestas de los usuarios respecto de la incidencia de la televisión en su comportamiento y actitudes. Es fruto de una investigación realizada en la ciudad de Xalapa, Veracruz (México que tuvo la finalidad de describir la relación que guarda la televisión con la identificación y promoción de los valores que protegen a los adolescentes de la localidad del uso de drogas. Los datos obtenidos ofrecen a los encargados de la programación televisiva las sugerencias emanadas de los propios adolescentes, obtenidas de forma científica para ayudarlos a mantenerse al margen de las drogas. Studies related to the use of addictive substances usually reflect the point of view of consumers. In this paper we present a qualitative analysis of the answers of non-users related to the impact of television on their attitudes and behaviour. This article is the result of extensive research carried out in the city of Xalapa, Veracruz, Mexico that aimed to describe the relationship between television and the identification and promotion of values that protect the city’s teenagers from drug use. The data obtained provide those in charge of television programming with suggestions from the teenagers to help them stay drug-free.

  16. Control of a deareador level of a thermoelectric power station using modern control techniques; Control de nivel de un deareador de una central termoelectrica utilizando tecnicas de control moderno

    Energy Technology Data Exchange (ETDEWEB)

    Chavez Estrada, Jose Israel

    1997-01-01

    The present work shows the implementation of the scheme of predictive control IMC (Internal Model Control) in order to control the level of the deareador of a combined cycle thermoelectric power station of (C.C.T.S.). The implementation has the purpose of looking for alternative strategies of control to the classic ones (PID`s) that more efficiently control the variables of interest, in addition to getting into the new control techniques of control. Following the philosophy of predictive control IMC the form to applying this technique is shown, as well as the implementation of this type of controllers. A comparison of predictive control IMC is made with the scheme of conventional control (three control elements PID`s ) used at present to control the level of the deareador in the Combined Cycle Thermoelectric Power stations of Dos Bocas, Veracruz, Mexico and of Gomez Palacio, Durango, Mexico. [Espanol] El presente trabajo muestra la implementacion del esquema de control predictivo IMC (Control con Modelo Interno) con el objeto de controlar el nivel del deareador de una Central Termoelectrica de Ciclo Combinado (C.T.C.C.). La implementacion tiene la finalidad de buscar estrategias de control alternas a las clasicas (PID`s) que controlen mas eficientemente la variable de interes, ademas de incursionar en las nuevas tecnicas de control. Siguiendo la filosofia del control predictivo IMC se muestra la forma de aplicar esta tecnica, asi como la implementacion de este tipo de controladores. Se hace una comparacion del control predictivo IMC con el esquema de control convencional (control de tres elementos PID`s) utilizando actualmente para controlar el nivel del deareador en las centrales termoelectricas de ciclo combinado de Dos Bocas, Veracruz y de Gomez Palacio, Durango en Mexico.

  17. Diffuse control of gas turbines in power stations of combined cycle; Contral difuso de turbinas de gas en centrales de ciclo combinado

    Energy Technology Data Exchange (ETDEWEB)

    Sanchez P, Marino; Garduno R, Raul; De Lara J, Salvadror; Castelo C, Luis [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)

    2001-07-01

    In this article the application of the technology of the fuzzy logic to the control of gas turbines is presented in order to evaluate it in one of the most difficult processes and with stricter control requirements that exist in the electrical generation industry. For being important for the generation electrical sector, given their use in Comision Federal de Electricidad (CFE), the first selected prototype was the gas turbines model W501 of Westinghouse, installed in the of combined cycle power stations of Dos Bocas, Veracruz, Gomez Palacio, Durango and Tula, Hidalgo, Mexico. The second selected prototype was the one of the turbo gas units type 5001 (that applies to the GE 5001 models and Westinghouse of series 191 and 251). Based on the analysis of the performance of the system of conventional control previously made, the controllers of speed and generation of electrical power were selected to be replaced by diffuse controllers. [Spanish] En este articulo se presenta la aplicacion de la tecnologia de la logica difusa al control de turbinas de gas con el proposito de evaluarla en uno de los procesos mas dificiles y con requerimientos mas estrictos de control que existen en la industria de generacion electrica. Por ser importantes para el sector electrico de generacion, dada su utilizacion en Comision Federal de Electricidad (CFE), el primer prototipo seleccionado fueron las turbinas de gas modelo W501 de Westinghouse, instaladas en la central de ciclo combinado de Dos Bocas, Veracruz, Gomez Palacio, Durango y Tula, Hidalgo, Mexico. El segundo prototipo seleccionado fue el de unidades turbogas tipo 5001 (que aplica a los modelos GE 5001 y Westinghouse de la serie 191 y 251). Basados en el analisis del desempeno del sistema de control convencional realizado previamente, los controladores de velocidad y de generacion de potencia electrica fueron seleccionados para ser sustituidos por controladores difusos.

  18. Nationwide study of the radiological screening of water for human consumption; Estudio a nivel nacional del tamizaje radiologico de agua de consumo humano

    Energy Technology Data Exchange (ETDEWEB)

    Velazquez M, R.; Aguilar P, M. del C.; Carreon G, E.; Parissi C, A., E-mail: rvelazquezm@yahoo.com [Laboratorio Estatal de Salud Publica, Eucalipto Mza. 12, Lote 7, Corredor Industrial Bruno Pagliai, 91697 Veracruz (Mexico)

    2014-10-15

    A screening test was carried out to the drinking water in the main cities of our country (Mexico). This study arises from the need that existed of having a radiological policy support in drinking water, which involved: the State Laboratory of Public Health of Veracruz State which has radiation analytical infrastructure. The study design was aimed to have the elements for further sanitary and/or epidemiological studies, so it was considered only the urban population to concentrate the major population of the country, as well as impact factors of water pollution by radiological materials: soils, precipitation, etc. The result of 928 samples from 14 states are presented and shows that they are consistent with the expected results, unable to be conclusive because the state participation was only of 43.5%, of which only 31% completed the shipment of samples in rainy and dry seasons. The State Laboratory of Public Health of Veracruz State has authorized methods by the Comision Federal para la Proteccion contra Riesgos Sanitarios (COFEPRIS) for the determination of gross beta and gross alpha radioactivity by the method of direct evaporation of samples of drinking water. A system of proportional flow detection under background calibrated was used. In the determination of gross beta values no greater than those established by the current national standard were detected. For gross alpha determination, the states with high rainfall and no mining industry located in the southeast of the country have lower values for gross alpha activity that the states in the north center of the country. Point values of gross alpha activity were detected in some states exceeding the standard values. (Author)

  19. Mitochondrial activity in fern spores of Cyathea costaricensis as an indicator of the impact of land use and water quality in rivers running through cloud forests.

    Science.gov (United States)

    Rodríguez-Romero, Alexis Joseph; Rico-Sánchez, Axel Eduardo; Catalá, Myriam; Sedeño-Díaz, Jacinto Elías; López-López, Eugenia

    2017-12-01

    Early-warning biomarkers, such as mitochondrial activity, have become a key tool in ecosystem assessment. This study aims to evaluate the response of mitochondrial activity in spores of the autochthonous fern Cyathea costaricensis as a bioassessment tool concurrently with land use and physicochemical evaluation in 11 sites along Bobos River, Veracruz, Mexico, to assess river water quality. Bobos River is located in the Nautla basin, northeastern Veracruz (Mexico); the upper river runs through a protected natural area (Filobobos River and adjacent areas). The study involved three monitoring periods: February, June and September 2014. In each study site, physicochemical water quality parameters were recorded to calculate the Water Quality Index (WQI); also, study sites were characterized in terms of land use. Water samples were collected to perform bioassays where spores of C. costaricensis were exposed to samples to assess mitochondrial activity; a positive control exposure test was run under controlled conditions to maximize mitochondrial activity. A Principal Component Analysis was performed to correlate land-use attributes with environmental variables and mitochondrial activity. Three river sections were identified: the upper portion was characterized by the dominance of native vegetation, the highest WQI (in September), and the lowest mitochondrial activity (63.87%-77.47%), related to the geological nature of the basin and high hardness levels. Mitochondrial activity peaked in September (98.32% ± 9.01), likely resulting from nutrient enrichment in the rainy season, and was lowest in February (74.54% ± 1.60) (p environmental characteristics such as land use and the geological nature of the basin, as well as with those related to human impacts. Copyright © 2017 Elsevier Ltd. All rights reserved.

  20. Promover en los adolescentes la identificación de sus valores como factores que les protegen de las adicciones: un modelo vivencial centrado en el estudiante

    Directory of Open Access Journals (Sweden)

    María del Pilar GONZÁLEZ FLORES

    2009-05-01

    Full Text Available RESUMEN: En el presente trabajo mostramos una propuesta de intervención surgida de un estudio amplio realizado en la ciudad de Xalapa, Veracruz, México con una muestra representativa de adolescentes no consumidores de sustancias adictivas. Esta propuesta pretende ser una aportación para la identificación y el fortalecimiento de los valores como factor de protección a pesar de la disponibilidad y facilidad de acceso a las drogas en el medio. Diseñamos un programa integral que ayude a los niños y adolescentes no consumidores a mantenerse sin hacer uso de sustancias adictivas, el cual puede ser implementado en las escuelas de educación básica y media. Comprende la fundamentación teórica; destinatarios; objetivos, habilidades, procesos y actitudes a promover; metodología; evaluación; y programa desglosado.ABSTRACT: In this paper we present an intervention offer emerged from a wide study carried out in the city of Xalapa, Veracruz, Mexico with a representative sample of non-consumer of addictive substances teenagers. This proposal is intended to be a contribution for the identification and strengthening of values as a protective factor, despite the availability and easy access to drugs in the environment. We designed a comprehensive program that will help non-consumers children and adolescents to maintain themselves without making any use of addictive substances, which could be implemented in basic and media education schools. It includes the fundamental theory; recipients; objectives, abilities, processes and attitudes to promote; methodology; evaluation; and program breakdown.