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Search Results: 1 - 10 of 213276 matches for " Saúl Bautista Fragoso "
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Corrosion Behavior of API 5L X52 Steel under High Concentrations of H2S/CO2 Gases  [PDF]
Mónica Jazmín Hernández Gayosso, Gerardo Zavala Olivares, Saúl Bautista Fragoso, Gabriel Ernesto Blanco del Valle, Daniel Mauricio Godínez Oidor, Víctor ángel Rodríguez Gómez
Materials Sciences and Applications (MSA) , 2016, DOI: 10.4236/msa.2016.710051
Abstract: In the present work, the susceptibility of API 5L X52 steel to corrosion processes was evaluated in the presence of high contents of hydrogen sulfide and carbon dioxide. Gravimetric tests and surface analyses were carried out to establish both the corrosion rate and damage type exhibited by the metal. The obtained results indicate that the hydrogen sulfide is the most active gas in the corrosion processes that took place, quite above carbon dioxide. The main observed corrosion products were iron sulfides and the typical damage associated with hydrogen sulfide presence was Sulfide Stress Cracking (SSC). The surface damage evidences the presence of cracks with considerable magnitude and metal loss as consequences of the corrosion processes. Likewise, the presence of oxygen in the system modifies the displayed corrosion type, where corrosion products such as iron oxides and reduction in the number and extent of cracks are observed. On the other hand, the addition of a film-forming corrosion inhibitor based on modified imidazolines eliminates completely the development of cracks, although under certain test conditions, it can favor localized pitting corrosion.
Los valores y las TICs en las instituciones educativas
J. L. Pariente Fragoso
Pixel-Bit , 2006,
Abstract: La irrupción creciente y acelerada de las tecnologías de la información y las comunicaciones (TICs) en los ámbitos educativos de todos los niveles en el mundo actual, demandan un estudio responsable y acucioso de los efectos que tienen y pueden tener a futuro en la formación de los educandos. Su utilización, con un elevado sentido ético, es una importante tarea que deben enfrentar los responsables de las instituciones educativas, por lo que es imperioso promover modelos de gestión para las mismas que incorporen valores trascendentes como ejes centrales para su utilización. En el presente artículo se analiza el impacto de las TICs y la formación en valores como tarea impostergable en los procesos educativos contemporáneos y se se ala la importancia de la utilización de modelos de toma de decisiones y de gestión que contemplan los valores como guías para su concepción y aplicación en las instituciones educativas contemporáneas.
Multilayer Graphene Synthesized by CVD Using Liquid Hexane as the Carbon Precursor  [PDF]
Claudia Bautista Flores, Doroteo Mendoza López
World Journal of Condensed Matter Physics (WJCMP) , 2011, DOI: 10.4236/wjcmp.2011.14023
Abstract: We produce multilayer graphene by the Chemical Vapor Deposition (CVD) method at atmospheric pressure and 1000°C, using flexible copper substrates as catalyst and liquid hexane as the source of carbon. We designed an optical device to measure the transmittance of the carbon films; with this information we calculate that the approximate number of layers is 11.
The Philippine historical earthquakecatalog: its development, current stateand future directions
M. L. P. Bautista,B. C. Bautista
Annals of Geophysics , 2004, DOI: 10.4401/ag-3307
Abstract: This report will trace the development of the historical earthquake catalog of the Philippines, assess its present state and recommend future research directions. The current Philippine historical earthquake catalog is culled from various catalogs, both global and local, that were developed since the first Philippine catalog by Perrey was published in 1860. While early global catalogs gave simple mention of earthquakes in the Philippines, more focused earthquake catalogs about the Philippines gave more explicit descriptions of earthquake accounts and adopted descriptions by local historians. Over the years, various historians and seismologists continued to compile their catalogs whose contents depended on the author?s perspectives and purposes. These works varied from simple listings to others including detailed descriptions. It was only recently that an attempt made to parameterize the magnitudes and epicenters of Philippine historical earthquakes using magnitude-felt area relations was done. A more detailed catalog, however, is now underway that will show details of intensity distribution for each significant historical earthquake. By comparing the historical catalog with the recent catalog and assuming that the recent catalog is complete, we find that there are still a substantial amount of historical earthquakes that needs to be reviewed and located. Possible sources of new information are local libraries, museums and archives in the Philippines, Spain and other Southeast Asian countries to which the country was in contact with during historical times.
Anti-proliferative effect of extremely low frequency electromagnetic field on preneoplastic lesions formation in the rat liver
Mónica Jiménez-García, Jaime Arellanes-Robledo, Diana Aparicio-Bautista, Miguel Rodríguez-Segura, Saúl Villa-Trevi?o, Juan Godina-Nava
BMC Cancer , 2010, DOI: 10.1186/1471-2407-10-159
Abstract: Male Fischer-344 rats were subjected to the modified resistant hepatocyte model and were exposed to 4.5 mT - 120 Hz ELF-EMF. The effects of the ELF-EMF on hepatocarcinogenesis, apoptosis, proliferation and cell cycle progression were evaluated by histochemical, TUNEL assay, caspase 3 levels, immunohistochemical and western blot analyses.The application of the ELF-EMF resulted in a decrease of more than 50% of the number and the area of γ-glutamyl transpeptidase-positive preneoplastic lesions (P = 0.01 and P = 0.03, respectively) and glutathione S-transferase placental expression (P = 0.01). The number of TUNEL-positive cells and the cleaved caspase 3 levels were unaffected; however, the proliferating cell nuclear antigen, Ki-67, and cyclin D1 expression decreased significantly (P ≤ 0.03), as compared to the sham-exposure group.The application of 4.5 mT - 120 Hz ELF-EMF inhibits preneoplastic lesions chemically induced in the rat liver through the reduction of cell proliferation, without altering the apoptosis process.Electromagnetic fields have been employed as useful tools in medical diagnosis. Recently, the use of electromagnetic fields has been expanded to therapeutic purposes because their interactions with living matter produce effects that initiate, accelerate or inhibit biological processes. Frequencies below 300 Hz are known as extremely low frequency electromagnetic fields (ELF-EMF) and do not have enough energy to break molecular bonds; for example, they do not cause direct damage to DNA [1]. Additionally, ELF-EMF are non-invasive and non-ionizing and even have non-thermal effects on cells and tissues. These properties have led to studies of the influence of ELF-EMF on the development of various diseases, including cancer.While some researchers associate ELF-EMF exposure with carcinogenesis [2,3], other studies of experimental models and human cancers have shown that ELF-EMF do not increase the risk of several cancer types, including liver cancer, and that
Crecimiento y sólidos solubles de Agave potatorum Zucc. inducidos por riego y fertilización
Martínez Ramírez, Saúl;Trinidad Santos, Antonio;Robles, Celerino;Galvis Spinola, Arturo;Hernández Mendoza, Teresa M.;Santizo Rincón, José A.;Bautista Sánchez, Gilberto;Pedro Santos, Eucebio C.;
Revista fitotecnia mexicana , 2012,
Abstract: because agave potatorum zucc. is adapted to the arid environment of the mixteca oaxaque?a and it is used to produce a mezcal of high demand, its culture is strategic. an experimental trial to study two levels of irrigation (with and without) and four levels of nitrogen (0, 50, 100 and 150 kg of n ha-1) was carried out on plants of 2, 3, 4 and 5 years old in a calcareous regosol of san pedro yodoyuxi, huajuapan de león, oaxaca, méxico. the 32 treatments were evaluated under an experimental design of randomized complete blocks with four replications. every month the following variables were recorded: content of total soluble solids in leaf (ssl), and increases in plant height (ph), plant diameter (pd), leaf area (la) and number of unfolded leaves (nul). collected data were submitted to analysis of variance and mean comparisons by tukey test with α = 0.05. it was found that a. potatorum plants increased all their response variables as they grew older. fertilization with 50 kg of n ha-1 induced an increase in leaf soluble solutes (ssl) in plants 5 years old, but not with higher n rates and neither in plants 2 years old. under non irrigated conditions both lss and plant height increased in 5 years old plants, whereas the irrigated conditions improved leaf growth and lss in 2-3 years old plants.
Characterization of S3Pvac Anti-Cysticercosis Vaccine Components: Implications for the Development of an Anti-Cestodiasis Vaccine
Dunia Rassy,Raúl J. Bobes,Gabriela Rosas,Victor H. Anaya,Klaus Brehm,Beatriz Hernández,Jacquelynne Cervantes,Saúl Pedraza,Julio Morales,Nelly Villalobos,Aline S. de Aluja,Juan P. Laclette,Caris M. Nunes,Germano F. Biondi,Gladis Fragoso,Marisela Hernández,Edda Sciutto
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0011287
Abstract: Cysticercosis and hydatidosis seriously affect human health and are responsible for considerable economic loss in animal husbandry in non-developed and developed countries. S3Pvac and EG95 are the only field trial-tested vaccine candidates against cysticercosis and hydatidosis, respectively. S3Pvac is composed of three peptides (KETc1, GK1 and KETc12), originally identified in a Taenia crassiceps cDNA library. S3Pvac synthetically and recombinantly expressed is effective against experimentally and naturally acquired cysticercosis.
Study of portuguese handball players of different playing status. A morphological and biosocial
L.M. Massu?a,I Fragoso
Biology of Sport , 2011,
Abstract: The development of sport has guided sports sciences researchers to the study of excellence in sport performance. In accordance, this study aims to evaluate the relation between some morphological and biosocial factors and sport level and tactical position in handball players of Portuguese leagues. A total of 187 male handball athletes (age, 23.48±5.12 years) participated in this study. The sample was divided into five groups (Top elite, Moderate elite, Sub-elite, Moderate trained, Junior elite) for comparison. Morphological evaluation of participants comprised the study of 11 anthropometric measures, adipose mass and fat-free mass. To evaluate biosocial dimensions, participants completed the Portuguese Biosocial RAPIL questionnaire (adapted to handball athletes). Results showed that top elite athletes were taller, heavier, had higher fat-free mass, less fat mass, higher socio-economic status and higher weekly energy expenditure. These findings can be a useful tool to promote real changes in training methods, specifically in relation to the weekly energy expenditure in training (i.e., training volume).
GPCR Conformations: Implications for Rational Drug Design
Abby L. Parrill,Debra L. Bautista
Pharmaceuticals , 2011, DOI: 10.3390/ph4010007
Abstract: G protein-coupled receptors (GPCRs) comprise a large class of transmembrane proteins that play critical roles in both normal physiology and pathophysiology. These critical roles offer targets for therapeutic intervention, as exemplified by the substantial fraction of current pharmaceutical agents that target members of this family. Tremendous contributions to our understanding of GPCR structure and dynamics have come from both indirect and direct structural characterization techniques. Key features of GPCR conformations derived from both types of characterization techniques are reviewed.
Prevalence of parafunctional habits and temporomandibular dysfunction symptoms in patients attending a tertiary headache clinic
Fragoso, Yára Dadalti;Alves, Heloísa Helena Carvalho;Garcia, Sidney Oliveira;Finkelsztejn, Alessandro;
Arquivos de Neuro-Psiquiatria , 2010, DOI: 10.1590/S0004-282X2010000300009
Abstract: objetive: to investigate the most prevalent forms of headache in a tertiary outpatient service, and to assess the frequency of associated parafunctional habits and temporomandibular dysfunction symptoms (tmd). method: all new patients referred to the headache outpatient service in unimes during 2008 were prospectively assessed by the neurologist and the dental surgeon. results: eighty new patients were assessed; chronic migraine and episodic migraine without aura were the most prevalent conditions, accounting for 66.3% of all cases. there was significantly higher use of analgesics/days for the chronic migraine patients. the prevalence of parafunctional habits was 47.5% and the prevalence of tmd symptoms was 35%. conclusion: the high prevalence of primary headaches, parafunctional habits and tmd symptoms and the inadequate use of analgesic drugs suggest that primary healthcare units need further training in the field of headache and orofacial pain.
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