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Aproximadamente 18 registro(s) hasta el momento: (journal)

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Recurso libre

The pyroclastic dikes of the Tertiary San Luis Potosí volcanic field: Implications on the emplacement of Panalillo ignimbrite
Torres-Hernández,José Ramón - Labarthe-Hernández,Guillermo - Aguillón-Robles,Alfredo - Gómez-Anguiano,Martín - Mata-Segura,José Luis

Formato:	journal article
Enlaces:	Pyroclastic dikes emplaced along regional NW-SE faults in the Tertiary San Luis Potosí Volcanic Field consist of vitric pumice shards, rhyolite lithics, and broken crystals of quartz, sanidine, and biotite. These clasts display a parallel orientation inside the dikes and…
Fecha:	2006-12-01
Recurso:	SCIELO

Recurso libre

First records of the ticks Amblyomma calcaratum and A. pacae (Acari: Ixodidae) parasitizing mammals of Mexico
Guzmán-Cornejo,Carmen - Pérez,Tila M. - Nava,Santiago - Guglielmone,Alberto A.

Formato:	journal article
Enlaces:	Based on study of ticks deposited in the Colección Nacional de Ácaros, Instituto de Biología, Universidad Nacional Autónoma de México, we report the first records in Mexico for two species of Amblyomma: Amblyomma calcaratum ex Tamandua mexicana, and Amblyomma pacae…
Fecha:	2006-06-01
Recurso:	SCIELO

Recurso libre

A new leech species of Semiscolex (Arhynchobdellida: Semiscolecidae) from Lake Catemaco, Veracruz, Mexico
Oceguera-Figueroa,Alejandro

Formato:	journal article
Enlaces:	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.…
Fecha:	2006-12-01
Recurso:	SCIELO

Recurso libre

Archaeological calibration of remagnetized volcanic rocks from pottery firing kilns in Cuentepec, Morelos, Mexico
Alva-Valdivia,L. M - González-Rangel,J. A - Soler-Arechalde,A. M - López-Varela,S. L - López-Loera,H

Formato:	journal article
Enlaces:	Ethnoarchaeological research at the site of Cuentepec, Mexico includes experimental pottery dating in which social knowledge is obtained from archaeometric techniques. At Cuentepec, open kilns are used for firing pottery. Samples from volcanic rocks in the kilns were taken to…
Fecha:	2006-12-01
Recurso:	SCIELO

Recurso libre

Molecular characterization of alpha-thalassemia in the Mexican population
Reyes-Nuñéz,Virginia - Garcés-Eisele,Javier - Jorge,Susan - Kimura,Elza - Ferreira-Costa,Fernando - Sonati,María de Fátima - Ruiz-Reyes,Guillermo

Formato:	journal article
Enlaces:	Background. α-Thalassemia (α-Thal) has been poorly characterized at the molecular level in Mexico. Methods. 106 consecutive individuals identified in Laboratorios Clínicos de Puebla, with either hypochromia (MCH < 24 pg) and/or microcytosis (MCV < 75 fl in women or <…
Fecha:	2006-06-01
Recurso:	SCIELO

Recurso libre

Condom use and migration in a sample of Mexican migrants: potential for HIV/STI transmission
Fosados,Raquel - Caballero-Hoyos,Ramiro - Torres-López,Teresa - Valente,Thomas W.

Formato:	journal article
Enlaces:	OBJECTIVE: To analyze the association between condom use and migration to the United States (US) in two Mexican municipalities. MATERIAL AND METHODS: A cross-sectional, non-probabilistic study of egocentric social networks was conducted in Cuauhtémoc, Colima and Tonalá, Jalisco during the…
Fecha:	2006-02-01
Recurso:	SCIELO

Recurso libre

Cervical cancer and the HPV link: identifying areas for education in Mexico City's public hospitals
Aldrich,Tess - Landis,Sarah - García,Sandra G. - Becker,Davida - Sanhueza,Patricio - Higuera,Anjarath

Formato:	journal article
Enlaces:	OBJECTIVE:To assess Mexico City physicians' knowledge and practices regarding cervical cancer and human papillomavirus (HPV) to compare obstetricians/gynecologists (ob/gyns) and general practitioners (GPs) on these variables MATERIAL AND METHODS: In April 2003, 187 ob/gyns and GPs working in 15 hospitals…
Fecha:	2006-06-01
Recurso:	SCIELO

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Triglycerides and high-density lipoprotein cholesterol are associated with insulinemia in adolescents
Ramírez-López,Guadalupe - González-Villalpando,Clicerio - Salmerón,Jorge - González-Ortiz,Manuel - Valles-Sánchez,Victoria

Formato:	journal article
Enlaces:	OBJECTIVE: The aim of this study was to evaluate the association between lipids and insulin concentration in adolescents. MATERIAL AND METHODS: A cross-sectional study of 350 adolescents aged 14-19 years old from a public high school in Guadalajara, in the…
Fecha:	2006-08-01
Recurso:	SCIELO

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Reproductive and lifestyle factors associated with early menopause in Mexican women
Ortega-Ceballos,Paola A. - Morán,Carlos - Blanco-Muñoz,Julia - Yunes-Díaz,Elsa - Castañeda-Iñiguez,Maura S. - Salmerón,Jorge

Formato:	journal article
Enlaces:	OBJECTIVE: The purpose of this study was to evaluate the relationship between certain reproductive and lifestyle factors and the occurrence of early natural menopause. MATERIAL AND METHODS: A case/control study was conducted on a basal population of 2 510 women…
Fecha:	2006-08-01
Recurso:	SCIELO

Recurso libre

10.

Role of active and passive smoking on lung cancer etiology in Mexico City
Franco-Marina,Francisco - Villalba Caloca,Jaime - Corcho-Berdugo,Alexander

Formato:	journal article
Enlaces:	OBJETIVE: To estimate the association between passive and active smoking exposures and lung cancer in Mexico City and the corresponding attributable risks. MATERIAL AND METHODS: Data was analyzed from a multicenter population-based case-control study conducted in Mexico City. RESULTS: ORs…
Fecha:	2006-01-01
Recurso:	SCIELO

Recurso libre

11.

Late Cretaceous (Maastrichtian) foraminiferal assemblage from the inoceramid beds, Ocozocoautla Formation, central Chiapas, SE Mexico
Omaña,Lourdes

Formato:	journal article
Enlaces:	Foraminifera from samples collected in the lower part of the Ocozocoautla Formation were studied. This sequence crops out north-west of Tuxtla Gutiérrez in central part of Chiapas state in south-eastern Mexico. The lower part of the unit consists mostly of…
Fecha:	2006-01-01
Recurso:	SCIELO

Recurso libre

12.

El Espinal, a new plattenkalk facies locality from the Lower Cretaceous Sierra Madre Formation, Chiapas, southeastern Mexico
Vega,Francisco J - García-Barrera,Pedro - Perrilliat,María del Carmen - Coutiño,Marco A - Marino-Pérez,Ricardo

Formato:	journal article
Enlaces:	A new plattenkalk facies locality with plants, invertebrates and vertebrates in laminar dolomitic limestones from the Albian of the lower part of the Sierra Madre Formation in central Chiapas is reported. The gastropod ?Perissoptera sp., one odonate-zygopteran nymph, one hemipteran-?belostomatid…
Fecha:	2006-01-01
Recurso:	SCIELO

Recurso libre

13.

Acceptability and perceived side effects of insecticide indoor residual spraying under different resistance management strategies
Rodríguez,Américo David - Penilla,Rosa Patricia - Rodríguez,Mario Henry - Hemingway,Janet - Trejo,Antonio - Hernández-Avila,Juan Eugenio

Formato:	journal article
Enlaces:	OBJECTIVE: To assess household acceptability and perceived side effects of residual indoor pyrethroid (PYR), carbamate and organophosphate insecticides sprayed by annual rotation (ROT), spatial mosaic (MOS), and a single insecticide (DDT or PYR) in communities of the coastal plain of…
Fecha:	2006-08-01
Recurso:	SCIELO

Recurso libre

14.

Re-Os molybdenite and LA-ICPMS-MC U-Pb zircon geochronology for the Milpillas porphyry copper deposit: insights for the timing of mineralization in the Cananea District, Sonora, Mexico
Valencia,Victor A. - Noguez-Alcántara,Benito - Barra,Fernando - Ruiz,Joaquín - Gehrels,George - Quintanar,Francisco - Valencia-Moreno,Martín

Formato:	journal article
Enlaces:	New geochronological data presented here improves the understanding of the temporal evolution of the Cananea Mining District, and particularly of the Milpillas porphyry copper deposit (northeastern Sonora, Mexico). Uranium-lead zircon analyses, using laser ablation ICP-MS multi-collector, from the quartz monzonite…
Fecha:	2006-01-01
Recurso:	SCIELO

Recurso libre

15.

Contribution to the study of the mycobiota present in the natural habitats of Histoplasma capsulatum: an integrative study in Guerrero, Mexico
Ulloa,Miguel - Lappe,Patricia - Aguilar,Samuel - Park,Houng - Pérez-Mejía,Amelia - Toriello,Conchita - Taylor,Maria Lucia

Formato:	journal article
Enlaces:	The mycobiota present in natural habitats of Histoplasma capsulatum was determined in samples of bat guano, poultry droppings, and intestinal contents of bats. The following fungi were isolated: 1) from bat guano: the ascomycetes Aphanoascus fulvescens, Gymnascella citrina, Gymnoascus dankaliensis,…
Fecha:	2006-12-01
Recurso:	SCIELO

Recurso libre

16.

Determinant factors for malaria transmission on the coast of Oaxaca State, the main residual transmission focus in Mexico
Hernández-Avila,Juan E - Rodríguez,Mario H - Betanzos-Reyes,Angel F - Danis-Lozano,Rogelio - Méndez-Galván,Jorge F - Velázquez-Monroy,Oscar J - Tapia-Conyer,Roberto

Formato:	journal article
Enlaces:	OBJECTIVE: The purpose of this study was to investigate the influence of demographic, socioeconomic and ecological factors in malaria transmission in the most important residual transmission focus in Mexico, located in the state of Oaxaca. MATERIAL AND METHODS: The extension…
Fecha:	2006-10-01
Recurso:	SCIELO

Recurso libre

17.

Geophysical modeling of Valle de Banderas graben and its structural relation to Bahia de Banderas, Mexico
Arzate,Jorge A. - Álvarez,Román - Yutsis,Vsevolod - Pacheco,Jesús - López-Loera,Héctor

Formato:	journal article
Enlaces:	A gravimetric survey consisting of five lines and 483 stations, as well as a magnetotelluric (MT) survey consisting ofl 7 observation sites, were made in the Valle de Banderas region for the determination of the structural characteristics of the valley.…
Fecha:	2006-01-01
Recurso:	SCIELO

Recurso libre

18.

Chronostratigraphy and paleomagnetism of the Balsas Group in the Tuzantlán-Copalillo basin, northern Guerrero state, Mexico
Molina-Garza,Roberto S. - Ortega-Rivera,Amabel

Formato:	journal article
Enlaces:	The Cenozoic sedimentary fill of the Tuzantlán-Copalillo basin, in northeast Guerrero state, Mexico, is assigned to two distinct stratigraphic units. The first unit consists of a 200 m thick fining upward section that grades eastward from massive cobble…
Fecha:	2006-01-01
Recurso:	SCIELO