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Search Results: 1 - 10 of 136510 matches for " Mauricio; Gayosso Vázquez "
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Genetic polymorphism of the αs1-casein locus in five populations of goats from Mexico
Torres-Vázquez,José Antonio; Vázquez Flores,Felícitas; Montaldo,Hugo H; Ulloa-Arvizu,Raúl; Valencia Posadas,Mauricio; Gayosso Vázquez,Amanda; Alonso Morales,Rogelio Alejandro;
Electronic Journal of Biotechnology , 2008,
Abstract: with the objective of estimating allele frequencies, and testing for population divergence for the csn1s1 locus, genotypes of animals from five goat populations; saanen (n = 97), alpine (n = 81) toggenburg (n = 92), local goats with external appearance similar to the murciana-granadina breed from central mexico (n = 26) and heterogeneous local animals denominated mosaico lagunero (n = 30), from northern mexico, were identified using pcr and xmn1 pcr-rflp methodology. for saanen, alpine and toggenburg, the sum of e and f alleles had the largest frequencies (from 0.468 to 0.789), while for the groups local murciana-granadina and mosaico lagunero the sum of the most frequent allelic groups (a* and b*), were 0.385 and 0.533 respectively. both local murciana-granadina and mosaico lagunero populations showed heterozygote excess (p < 0.08). the percentage of the total genetic variation (fst) explained by population differences was 5.16. there was genetic differentiation for most pair comparisons between populations (p < 0.05), excepting for alpine versus toggenburg, and toggenburg versus mosaico lagunero (p > 0.05). for saanen and alpine the frequencies of alleles e and f were similar to the same breeds previously analyzed in europe. therefore there are opportunities of increasing the frequency of the strong alleles for protein content gene assisted selection (gas) in these two breeds. for toggenburg the most frequent allelic groups were f (0.32) and b* (0.21). results indicate differentiation between most populations for this locus. moreover, heterozygote excess in local populations indicated breed admixture.
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.
Polymorphism of locus DRB3.2 in populations of Creole Cattle from Northern Mexico
Fernández, Ilda G.;Ramírez, José Gonzalo Ríos;Vázquez, Amanda Gayosso;Arvizu, Raúl Ulloa;Morales, Rogelio A. Alonso;
Genetics and Molecular Biology , 2008, DOI: 10.1590/S1415-47572008005000020
Abstract: keywords : bola-drb3.2; polymorphism; creole cattle; pcr-rflp.
El consumo de tabaco en los hogares en México: resultados de la Encuesta de Ingresos y Gastos de los Hogares,1984-2000
Vázquez-Segovia,Luis Alonso; Sesma-Vázquez,Sergio; Hernández-Avila,Mauricio;
Salud Pública de México , 2002, DOI: 10.1590/S0036-36342002000700012
Abstract: objective. to analyze selected determinants of tobacco consumption in mexican homes. material and methods. data from the national household income and expenditure survey, 1984-2000, were analyzed. the analysis was conducted for the years 1984-1992 and 1994-2000. the likelihood of tobacco consumption in households was estimated with a logistic regression model. results. tobacco consumption during the first period was two times more likely from decile six (or=2.03, 95%, ci: 2.03-2.04) and during the second period from decile eight (or=2.06, 95%, ci: 2.05-2.07). households from decile one spent on average 9-22% of their income on tobacco; almost all of the households from decile ten spent only 1% of their income on tobacco. conclusions. households with higher income consumed more tobacco than households with low income; nevertheless, households with the lowest income devoted a greater proportion of income to tobacco consumption.
El consumo de tabaco en los hogares en México: resultados de la Encuesta de Ingresos y Gastos de los Hogares,1984-2000
Vázquez-Segovia Luis Alonso,Sesma-Vázquez Sergio,Hernández-Avila Mauricio
Salud Pública de México , 2002,
Abstract: Objetivo. Analizar algunos de los determinantes del consumo de tabaco en los hogares en México. Material y métodos. Los datos provienen de la Encuesta Nacional de Ingresos y Gastos de los Hogares (1984-2000). El análisis se realizó en dos periodos: 1984-1992 y 1994-2000. Las posibilidades de consumo de tabaco en hogares (PCTH) fueron estimadas mediante un modelo de regresión logística. Resultados. La PCTH durante el primer periodo fue superior a dos veces a partir del decil 6 (RM=2.03, IC 95%, 2.03-2.04) y durante el segundo periodo a partir del decil 8 (RM=2.06, IC 95%, 2.05-2.07). Los hogares del decil 1 gastaron en promedio de 9 a 22% de sus ingresos en tabaco; casi todos los hogares del decil 10, solamente 1%. Conclusiones. Los hogares con mayores ingresos consumieron más tabaco que los hogares de menores ingresos, sin embargo, los hogares de más bajos ingresos destinaron un porcentaje más importante de éstos al consumo de tabaco.
Insects as Stem Engineers: Interactions Mediated by the Twig-Girdler Oncideres albomarginata chamela Enhance Arthropod Diversity
Nancy Calderón-Cortés,Mauricio Quesada,Luis H. Escalera-Vázquez
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0019083
Abstract: Ecosystem engineering may influence community structure and biodiversity by controlling the availability of resources and/or habitats used by other organisms. Insect herbivores may act as ecosystem engineers but there is still poor understanding of the role of these insects structuring arthropod communities.
Chromosomal imbalances in four new uterine cervix carcinoma derived cell lines
Alfredo Hidalgo, Alberto Monroy, Rosa Ma Arana, Lucía Taja, Guelaguetza Vázquez, Mauricio Salcedo
BMC Cancer , 2003, DOI: 10.1186/1471-2407-3-8
Abstract: We performed HPV detection and CGH analysis in order to initiate the genomic characterization of four recently established cervical carcinoma derived cell lines from Mexican patients.All the cell lines were HPV18 positive. The most prevalent imbalances in the cell lines were gains in chromosomes 1q23-q32, 3q11.2-q13.1, 3q22-q26.1, 5p15.1-p11.2, this alteration present as a high copy number amplification in three of the cell lines, 7p15-p13, 7q21, 7q31, 11q21, and 12q12, and losses in 2q35-qter, 4p16, 6q26-qter, 9q34 and 19q13.2-qter.Analysis of our present findings and previously reported data suggest that gains at 1q31-q32 and 7p13-p14, as well as losses at 6q26-q27 are alterations that might be unique for HPV18 positive cases. These chromosomal regions, as well as regions with high copy number amplifications, coincide with known fragile sites and known HPV integration sites. The general pattern of chromosomal imbalances detected in the cells resembled that found in invasive cervical tumors, suggesting that the cells represent good models for the study of cervical carcinoma.Cervical carcinoma stands as the first cause of death among the Mexican female population with 14 deaths per 100,000 women with 15 years old or more, representing 34.2 % of all new female cancer cases reported [1]. High risk human papillomavirus (HPV) infection is considered to be the most important risk factor associated with the development of this tumor, and is present in 99.7% of the invasive cervical tumors worldwide [2].Comparative Genomic Hybridization (CGH) is a method employed in cancer genomics that allows the detection of DNA gains or losses at the genome level in a single hybridization experiment, indicating cytogenetic regions that might be involved in the transformation process. CGH has detected a specific pattern of chromosomal imbalances associated with particular stages of cervical transformation, and with different biological behaviors [3-10]. In this paper, we evaluated the pr
Grandes alcances de los RNAs peque?os RNA de interferencia y microRNA
Vázquez-Ortiz, Guelaguetza;Pi?a-Sánchez, Patricia;Salcedo, Mauricio;
Revista de investigación clínica , 2006,
Abstract: double-stranded rna (dsrna) induces a sequence-specific silencing in eukaryotic cells. this silencing process beggins when long dsrna is cleaved to 21 to 26 long small rna by means of the rnase iii-type enzyme dicer. these small dsrna are included into silencing effector complexes, that are targeted to complementary sequences. small rna dependent gene silencing can be achieved by distinct mechanisms based depending mainly on the nature of target sequences and on the proteins present in the effector complex. the route of interference rna (rnai) begins when dicer yields small interference rna (sir-na) that bind to complementary mrna for its degradation, forming the risc complex. sirna are naturally formed from transposons and dsrna viruses during its replication, as well as from other bidirectional transcribed repetitive sequences. some of the enzymes thar are part of the rnai machinery, including dicer, are encoded by multigene families in many species, that also play a role in other mechanisms of rnd-dependent gene silencing. microrna's (mirna) are other small rna's that can induce gene silencing at the mrna level. these are formed in a general manner when dicer process hairpin structures resulting from the transcription of non-coding sequences from plant and animal genomes. mirna's are integrated into a risc-like complex, after which, depending on their degree of complementarity with target mrna, can either repress translation or induce mrna degradation. mirna-dependent silencing is essential for the development of multicellular organisms. artificial rnai induction by means of sirna or mirna is being used as a tool to inactivate gene expression in culture cells and in living organisms. this review focuses on the progress in the understanding of the mechanisms involved in gene regulation by rna in animals and details some current efforts to apply theses phenomena as a tool in research and in the therapeutic of human diseases.
Tricobezoar gástrico: a propósito de un caso
López Andino,William Mauricio; Almeida Arias,Dulvis Amanda; Durán Vázquez,Nicanor; Benavides,Salvador;
Revista Cubana de Cirug?-a , 2008,
Abstract: the clinicosurgical case of a 26-year-old female patient with an abdominal tumor caused by gastric tricobezoar that was attended at ?pedro de armas? integral diagnosis center, in venezuela, in march 2007, is retrospectively described. the patient presented alopecia, a visible abdominal mass, discomfort in the upper left quadrant of the abdomen, early satiety, and loss of 10 kg of body weight. on the physical exploration, alopecia and an enlarged and curvilinear well-delimited intraabdominal mass that occupied the upper left quadrant of the abdomen were confirmed. the diagnosis was corroborated by endoscopic examination of the upper digestive tube. a mass composed of hairs from the scalp and food concretions were included in the anatomopathological report.
Tricobezoar gástrico: a propósito de un caso Gastric trichobezoar: apropos of a case
William Mauricio López Andino,Dulvis Amanda Almeida Arias,Nicanor Durán Vázquez,Salvador Benavides
Revista Cubana de Cirugía , 2008,
Abstract: Se presenta la descripción retrospectiva del caso clinicoquirúrgico de una paciente de 26 a os de edad con un tumor abdominal por tricobezoar gástrico, atendida en el mes de marzo del 2007 en el Centro de Diagnóstico Integral Pedro de Armas (Venezuela). La paciente presentó alopecia, una masa abdominal visible, molestias en el cuadrante superior izquierdo del abdomen, saciedad temprana y pérdida de 10 kg de peso. En la exploración física se constató la alopecia y una masa intraabdominal alargada y curvilínea bien delimitada, que ocupaba el cuadrante superior izquierdo del abdomen. El diagnóstico se corroboró mediante examen endoscópico del tubo digestivo superior y el informe anatomopatológico informó una masa compuesta por pelos del cuero cabelludo y concreciones alimentarias. The clinicosurgical case of a 26-year-old female patient with an abdominal tumor caused by gastric tricobezoar that was attended at Pedro de Armas Integral Diagnosis Center, in Venezuela, in March 2007, is retrospectively described. The patient presented alopecia, a visible abdominal mass, discomfort in the upper left quadrant of the abdomen, early satiety, and loss of 10 kg of body weight. On the physical exploration, alopecia and an enlarged and curvilinear well-delimited intraabdominal mass that occupied the upper left quadrant of the abdomen were confirmed. The diagnosis was corroborated by endoscopic examination of the upper digestive tube. A mass composed of hairs from the scalp and food concretions were included in the anatomopathological report.
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