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Search Results: 1 - 10 of 469153 matches for " María Rafaela Arreola-Ortiz "
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Análisis de sequías y productividad con cronologías de Pseudotsuga menziesii Rob. & Fern., y su asociación con El Ni?o en el nordeste de México
Arreola-Ortiz, María Rafaela;Návar-Cháidez, José de Jesús;
Investigaciones geográficas , 2010,
Abstract: this research was conducted to construct chronologies, to understand climatic shifts, and to determine productivity changes of psesudotsuga menziensii mirb. franco of the sierra madre oriental mountain range of nuevo león, méxico. radial growth patterns, drought episodes and productivity data were studied from the tree rings growth patterns during a 120 years study period. we also studied the association between recorded climate parameters and that hit chronologies using data of four climatic stations. chronologies were also associated to global scale climate events, the multivariate enso index (mei) and climate parameters associated to chronologies were reconstructed. it was noted that chronologies show four main drought episodes (1885-1903, 1907-1937, 1950-1963, and 1998-2003) that hit the highlands of northeastern mexico. productivity has a mean radial growth values of 0.82 mm y-1 and 1.18 mm y-1 during drought and wet episodes, respectively. there is a good association between chronologies and winter rainfall. reconstructed winter rainfall shows an increasing pattern in time and the mei is negatively associated to the chronologies indicating that the presence of wet and cold winters and early spring promote radial growth of trees in northern mexico.
Análisis de sequías y productividad con cronologías de Pseudotsuga menziesii Rob. & Fern., y su asociación con El Ni o en el nordeste de México
María Rafaela Arreola-Ortiz,José de Jesús Návar-Cháidez
Investigaciones geográficas , 2010,
Abstract: Con tres cronologías de Pseudotsuga menziesii Mirb. Franco obtenidas en la Sierra Madre Oriental (SMO), en el estado de Nuevo León, México, se determinaron periodos de sequías y productividad analizando el patrón de crecimiento radial durante un lapso de 120 a os. Se estudió la asociación entre el índice de crecimiento radial de las cronologías y los registros instrumentales de factores climáticos (precipitación y temperatura), obtenidos de cuatro estaciones meteorológicas vecinas a los sitios de muestreo. Se asociaron las cronologías con el índice multivariado del ENSO (MEI). Los resultados indican que en las cronologías resaltan cuatro periodos de sequías que se presentaron entre los a os: 1885-1903, 1907-1937, 1950-1963 y 1998-2003. La productividad disminuye notablemente de 1.18 mm a o-1 de crecimiento radial en épocas húmedas a 0.82 mm a o-1 durante la presencia de sequías. Existe buena asociación entre el índice de Crecimiento Radial Estandarizado (ICRE) de las cronologías con la precipitación invernal observada. La reconstrucción de la precipitación invernal basada en las cronologías, muestra un ascenso paulatino a través del tiempo, desde 1880 hasta 2003. La correlación del ICRE de las tres cronologías y el MEI presenta buena asociación en la mayoría de los meses del a o, principalmente, durante los meses que cubren las estaciones de oto o, invierno y primavera, indicando que el crecimiento del ancho de los anillos se ve favorecido con la presencia de bajas temperaturas y precipitaciones por arriba del promedio durante el invierno o la etapas primarias de la primavera.
Dendrocronología de Pseudotsuga menziesii (Mirb.) Franco de la Sierra Madre Oriental en Nuevo León, México
Arreola-Ortiz, María Rafaela;González-Elizondo, Martha;Návar-Cháidez, José de Jesús;
Madera y bosques , 2010,
Abstract: tree-ring chronologies for pseudotsuga menziesii were constructed for three sites of the sierra madre oriental mountain range of the state of nuevo leon, mexico: el potosí, la encantada and la marta. the correlation coefficients between chronologies, the normality tests on the ring width, and an index of ring width indicate both, the climate regionalization and the decadence on diameter growth of pseudotsuga menziesii (mirb.) franco populations. potential subtle climatic changes may be contributing to the decline of radial growth of the three plant communities studied.
Comparative study of breast cancer in Mexican and Mexican-American women  [PDF]
María Elena Martínez, Luis Enrique Gutiérrez-Millan, Melissa Bondy, Adrian Daneri-Navarro, María Mercedes Meza-Montenegro, Ivan Anduro-Corona, Ma Isabel Aramburo-Rubio, Luz María Adriana Balderas-Pe?a, José Adelfo Barragan-Ruiz, Abenaa Brewster, Graciela Caire-Juvera, Juan Manuel Castro-Cervantes, Mario Alberto Chávez Zamudio, Giovanna Cruz, Alicia Del Toro-Arreola, Mary E. Edgerton, María Rosa Flores-Marquez, Ramon Antonio Franco-Topete, Helga Garcia, Susan Andrea Gutierrez-Rubio, Karin Hahn, Luz Margarita Jimenez-Perez, Ian K. Komenaka, Zoila Arelí López Bujanda, Dihui Lu, Gilberto Morgan-Villela, James L. Murray, Jesse N. Nodora, Antonio Oceguera-Villanueva, Miguel Angel Ortiz Martínez, Laura Pérez Michel, Antonio Quintero-Ramos, Aysegul Sahin, Jeong Yun Shim, Maureen Stewart, Gonzalo Vazquez-Camacho, Betsy Wertheim, Rachel Zenuk, Patricia Thompson
Health (Health) , 2010, DOI: 10.4236/health.2010.29153
Abstract: Breast cancer is the number one cause of can- cer deaths among Hispanic women in the United States, and in Mexico, it recently became the primary cause of cancer deaths. This malign- nancy represents a poorly understood and un- derstudied disease in Hispanic women. The ELLA Binational Breast Cancer Study was es- tablished in 2006 as a multi-center study to as- sess patterns of breast tumor markers, clinical characteristics, and their risk factors in women of Mexican descent. We describe the design and implementation of the ELLA Study and provide a risk factor comparison between women in the U.S. and those in Mexico based on a sample of 765 patients (364 in the U.S. and 401 in Mexico). Compared to women in Mexico, U.S. women had significantly (p < 0.05) lower parity (3.2 vs. 3.9 mean live births) and breastfeeding rates (57.5% vs. 80.5%), higher use of oral contraceptives (60.7% vs. 50.1%) and hormone replacement therapy (23.3% vs. 7.6%), and higher family history of breast cancer (15.7% vs. 9.0%). Re- sults show that differences in breast cancer risk factor patterns exist between Mexico and U.S. women. We provide lessons learned from the conduct of our study. Binational studies are an important step in understanding disease pat- terns and etiology for women in both countries.
Clinical and microbiological features of vulvovaginitis in Mexican girls  [PDF]
Mario I. Ortiz, Edna J. Arreola-Bautista, Beatriz A. Sánchez-Reyes, Beatriz A. Sánchez-Reyes, Marco A. Escamilla-Acosta
Open Journal of Obstetrics and Gynecology (OJOG) , 2013, DOI: 10.4236/ojog.2013.32046
Abstract:

Study Objective: To determine the prevalence of vulvovaginitis, predisposing factors, microbial etiology and therapy in patients treated at the Hospital del Nino DIF, Pachuca, Hidalgo, Mexico. Design. This was an observational and descriptive study from 2006 to 2009. Setting: Hospital del Nino DIF, Pachuca, Hidalgo, Mexico. Participants. Patients from 0 to 16 years, with vulvovaginitis and/or vaginal discharge were included. Interventions: None. Main Outcome Measures: Demographic data, etiology, clinical features, risk factors and therapy were analyzed. Results: Four hundred twenty seven patients with diagnosis of vulvovaginitis were included. The average prevalence to 4 years in the study period was 0.19%. The age group most affected was schoolchildren (225 cases: 52.69%). The main signs and symptoms presented were leucorrhea (99.3%), vaginal hyperemia (32.6%), vulvar itching (32.1%) and erythema (28.8%). Identified risk factors were poor hygiene (15.7%), urinary tract infection (14.7%), intestinal parasites (5.6%) and obesity or overweight (3.3%). The main microorganisms found in vaginal cultures were enterobacteriaceae (Escherichia coli, Klebsiella and Enterococcus faecalis), Staphylococcus spp, and Gardnerella vaginalis. Several inconsistent were found in the drug prescription of the patients. Conclusion: Vulvovaginitis prevalence in Mexican girls is low and this was caused mainly by opportunist microorganisms. The initial treatment of vulvovaginitis must include hygienic measure and an antimicrobial according to the clinical features and microorganism found.

Determinación de acidez en andisoles de la zona cafetera colombiana utilizando diferentes metodologías
Ortiz María Eugenia
Acta Agronómica , 2003,
Abstract:
La medicina, la atención médica y la lengua en la XLIV Conferencia Anual de la ATA
María Gabriela Ortiz
Panace@ : Revista de Medicina, Lenguaje y Traducción , 2004,
Abstract:
La comida que nos une y la geografía que nos separa: El discurso gastronómico símbolo de la identidad puertorrique a en Trópico en Manhatt an de Guillermo Cotto-Thorner
María Inés Ortiz
Centro Journal , 2009,
Abstract: This article analyzes Guillermo Cotto-Thorner's Caribbean migration novel, Trópico en Manhattan (Manhattan Tropics, 1975), specifically, the use of Puerto Rican gastronomy as an investigative mechanism for identity negotiation in the process of United States immigration. Gastronomy transcends geografic, linguistic, political, and social limits to become a symbol that unites Puerto Ricans living outside the island. At the same time, it turns into an instrument of cultural heritage for future generations.
LA ESCRITURA ACADéMICA UNIVERSITARIA: ESTADO DEL ARTE
Ortiz Casallas,Elsa María;
íkala, Revista de Lenguaje y Cultura , 2011,
Abstract: this paper presents a general analysis of the state of the art studies in international and national context (colombia) about academic writing university. its objective is to establish the current state of intellectual field and propose new investigative trails that explain, con-textualize and better understand the problems that students present concerning academic writing university. the documents found, research and thesis-were examined and analyzed using the approaches, methodology and theoretical frameworks found in them. the results of the study indicate that, in general, the research trend in academic writing, including the university, has been more focused on the strategy (de certeau, 1996) via regulation and discipline of writing practices, which in the identification and own analysis of the tactics and practices of scriptural academic work of students and teachers. rare are the works that document practices and analyze the social representations to see what happens from the field dominated towards a strategy, and what relationships and discontinuities are established between them.
Representaciones sociales de la escritura y la lectura en la educación basica y media
Ortiz Casallas,Elsa María;
Núcleo , 2009,
Abstract: this article describes and analyzes the predominant social representations related to reading and writing in the context of primary and secondary education in the city of ibagué, tolima-colombia. this study can be considered exploratory and descriptive, since it inquired about the knowledge, beliefs, practices and values that 786 participating students assigned to these social practices. the results show the need to develop educational projects and intervention proposals with the objective of changing, in the long term, those representations, which have much impact on the students? writing and reading practices.
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