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Search Results: 1 - 10 of 426306 matches for " Mónica Palma Jiménez "
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Association of Morphology and Immunophenotype in Diffuse Large B-Cell Lymphomas with Bone Marrow Infiltration in a Sample Mexican Population  [PDF]
Mónica-Belinda Romero-Guadarrama, Fiacro Jiménez Ponce, Armando Medina Cruz, Elsa Lorena Durán Ramírez, Icela Palma Lara
Open Journal of Pathology (OJPathology) , 2012, DOI: 10.4236/ojpathology.2012.22007
Abstract: Introduction: Diffuse large B-cell lymphoma (DLBCL), not otherwise specified, is a large B-cell lymphoma with a diffuse growth pattern and aggressive clinical course. It is divided in subgroups according to its morphology, immunophenotype, and primary site. Dissemination to bone marrow occurs in 11% to 35% of cases and can be of concordant or discordant morphology. Objective: To examine the association, the type of bone marrow involvement in relation to the primary site, morphology, immunohistochemistry of DLBCLs and to determine the cases of Epstein-Barr virus positive DLBCLs. Materials and Methods: We reviewed lymph node and extranodal biopsies as well as the respective bone marrow biopsies in all cases of DLBCL diagnosed in the Hospital General de México during the period from 2002 to 2010. We used immunohystochemistry for immunophenotype identification (Hans’s algorithm) and an in-situ hybridization technique to detect presence of Epstein Barr encoded RNA (EBER). Results: We included 108 patients with a mean age of 51.9 years, 59 (55%) were men. DLBCL involved lymph nodes in 60% of cases and palatine tonsils in 13%. The centroblastic variant predominated (80%) and 58% originated from activated B-cells. Infiltration of bone marrow was present in 30% of cases and was discordant in 55% of these cases. Correlation between morphology and bone marrow infiltration was statistically significant (P = 0.0003). Presence of Epstein-Barr virus was demonstrated in 15% of patients older than 50 years. Conclusions: Dissemination to bone marrow occurred in 30% of cases and discordant involvement was most common. DLBCL originating from activated B-lymphocytes predominated and the most common extranodal sites were palatine tonsils, suggesting that our population has a clinical behavior similar to Asiatic populations.
Desarrollo de una metodología de crianza en laboratorio de la polilla de los cereales Sitotroga cerealella (Olivier) como posible hospedante de insectos biocontroladores de interés agrícola
Mónica Palma Jiménez,Fressy Rojas Arce,Annie Guillén Watson,Vladimir Villalba Velásquez
Tecnología en Marcha , 2011,
Abstract: Sitotroga cerealella (Olivier) es conocida como la polilla de los cereales, ya que se alimenta de granos de cereales de consumo humano, causando da o tanto a los sembradíos como a los almacenes de granos. A pesar de que el control químico es efectivo para bajar la población de la polilla, se ha optado por el biocontrol mediante parasitoides y depredadores. Por tal motivo, en el presente ensayo, desarrollado en el laboratorio de biocontroladores del Centro de Investigación en Biotecnología, se pretende establecer una metodología de cría masiva de Sitotroga cerealella, para que sirva de hospedero del depredador Chrysoperla sp., mediante la construcción de una estructura metálica acondicionada para el establecimiento de bandejas con el sustrato de trigo para el desarrollo de las polillas y su posterior puesta y recolecta de huevos para la alimentación de los depredadores. Se determinó que el ciclo biológico de la polilla fue de 4,5 días para los huevos; 23 días para las larvas; 7,7 para las pupas y 4 días para los adultos, con lo que era posible establecer una nueva generación cada cinco semanas. El ataque de los ácaros en el presente proyecto impidió avanzar con la cría de los depredadores, por lo que se desarrolló solo la metodología de la cría de la polilla de los cereales.
Estrategias de sobrevivencia, alternativas económicas y sociales de la unidad campesina
Mónica Vargas Jiménez
Papeles de población , 1996,
Abstract:
Aplicabilidad de la técnica de espectroscopia de reflectancia en el infrarrojo cercano para determinar dodecilbenceno sulfonato de sodio en limpiadores líquidos
Ygmar Jiménez,Mónica López
Avances en Química , 2011,
Abstract: In this work was studied the applicabilty of the near infrared reflectance spectroscopy (NIRS) to determine the sodium dodecylbenzene sulfonate in ten types of liquid cleaners. To obtain the calibration curve was applied partial least squares regression, due to the presence of the spectral interferences. Was confirmed the presence of matrix effect. The method has acceptable trueness and precision. Was found a expanded uncertainty of (0,0538), it is less than the required uncertainty (0,1708) indicating that the NIRS method can be applicable for determining sodium dodecylbenzene sulfonate in liquid cleaners
RELACIóN ENTRE LA INGESTA NUTRICIONAL Y EL RENDIMIENTO Fí SICO EN LOS ATLETAS PARTICIPANTES EN EL TRIATLóN DEL COCO DEL AóO 2002 EN COSTA RICA
Mónica Uma?a Alvarado,José Moncada Jiménez
Pensar en Movimiento : Revista de Ciencias del Ejercicio y la Salud , 2002,
Abstract: La investigación estudió las posibles relaciones entre el consumo de carbohidratos (CHO) antes y durante una competencia de triatlón y el rendimiento, y variación en la glicemia de los participantes. También se determinó si existían diferencias entre la ingesta de alimentos de los deportistas que presentaron síntomas gastrointestinales y los que no los presentaron. En el estudio participaron 36 triatlonistas (4 mujeres y 32 hombres), todos finalizaron la competencia. Se midió la glicemia y el peso corporal antes y después del evento. Al finalizar el evento, se aplicó una entrevista para conocer el consumo de alimentos y bebidas del desayuno, periodo de espera y durante la competencia, así como la presencia de síntomas gastrointestinales durante el evento. Se encontró que la glucosa sanguínea antes de la competencia fue menor (M = 5.49 ± 0.65 mmol/l) que la encontrada al finalizar la prueba (M = 6.38 ± 1.19 mmol/l) (p < 0.001). El peso al finalizar la competencia (M = 67.11 ± 7.70 kg) fue menor al peso inicial (M = 68.53 ± 7.74 kg) (p < 0.001). Se encontraron relaciones entre el tiempo de llegada de los participantes y el consumo de CHO (g · min-1) durante el triatlón (r = - 0.42, p = 0.011), entre la variación en la glicemia y el consumo de CHO totales (r = 0.41, p = 0.013), y la variación en la glicemia y el consumo de g CHO · min-1 (r = 0.33, p = 0.048). No hubo casos de hipoglicemia, ni se hallaron diferencias entre la ingesta de quienes reportaron problemas gastrointestinales y los que no lo hicieron, aunque se observó una tendencia de mayor consumo de energía y nutrientes entre los que presentaron estos problemas, en comparación con los que no los presentaron.
Diffuse Large B-Cell Lymphoma of the Central Nervous System. Immunophenotype, Clinicopathological Features and Differential Diagnosis  [PDF]
Mónica Belinda Romero-Guadarrama, María Esther Gutiérrez Díaz-Ceballos, Fiacro Jiménez-Ponce, Samantha Thingen-Velarde
Open Journal of Pathology (OJPathology) , 2012, DOI: 10.4236/ojpathology.2012.24024
Abstract: Background: Diffuse large B-cell lymphomas of the central nervous system (DLBCL CNS) represent less than 1% of all lymphomas and between 2% and 3% of all cerebral tumors. They occur in adults of 60 years of age or more. The objective of this work is to describe the clinical-pathological characteristics, the immunophenotype and the differential diagnosis. Clinical Case: From the files of the surgical pathology unit we found four cases of primary diffuse large B cell lymphoma of the central nervous system in a 6-year period. Three corresponded to women over 47 years of age and the other to a 42-year-old man. The time of evolution was between 2 and 4 months. The symptoms were headache, blurred vision, hemiparesis, and seizures. Localization was in the pineal region, the frontal, parietal regions, and the right thalamus. Morphologically, large lymphoid cells with a diffuse growth pattern and necrosis were observed. Immunohistochemical markers, such as CD 20 and bcl2 were positive, one was positive to CD3. Expression of bcl6 and CD 10 was positive in one case, and MUM-1 was positive in three cases. All the cases were negative for Epstein-Barr virus. Conclusions: The diffuse large-B cell lymphoma of the central nervous system is rare. Its average age of presentation is at 60 years or older. The localization is in the pineal, frontal, parietal and thalamic regions. Three cases were originated by activated B lymphocyte (MUM-1 expression) and other from the Germinal Center (GC) (CD 10 expression). The clinical course was bad. The four patients died shortly after the diagnosis.
Plasma Accumulations of Vitamin B6 from an Oral Dose in a New Reversible Model for Mouse Gut Injury and Regeneration  [PDF]
Pilar Jiménez, Damián Cordoba-Diaz, Patricia Cabrero, Mónica Aracil, Manuel J. Gayoso, Manuel Garrosa, Manuel Cordoba-Diaz, Tomás Girbés
Food and Nutrition Sciences (FNS) , 2013, DOI: 10.4236/fns.2013.49118
Abstract:

Chemically based rodent models are used to assess the positive effects promoted by foods and gut microbiota on gut health. Lectins with enzymatic activity, such as type 2 ribosome-inactivating proteins, might also prove useful for exploring these issues. Sub-lethal doses of the lectin nigrin from Sambucus nigra L. to mice promoted reversible derangement of gut epithelium by induction of apoptosis of transit amplifying cells of the small intestine crypts in a time-dependent course. The present work seeks to study vitamin B6 accumulation in plasma from an oral bolus in a mouse nigrin model. 24 h after sub-lethal nigrin b treatment, there was clear body weight reduction associated to a notable increase in Evan’s blue stain accumulation in excised small intestine, an increase in myeloperoxidase activity, and a near 50% reduction in plasma accumulation of vitamin B6. Histological analysis of small intestine sections of nigrin b-treated animals also revealed significant derangement of intestinal crypts. Seventy two hours after nigrin b treatment, stain uptake decreased and vitamin B6 accumulation was almost restored despite villi derangement. Large intestine crypts were scarcely or not at all affected. Eight days after nigrin b treatment, vitamin B6 uptake and intestinal crypt structure had fully recovered. The nigrin b mice model supports the view that, under these conditions, the carrier-mediated vitamin B6 uptake component of the small intestine crypts is probably the most active when the vitamin is administered orally as a bolus. The findings provide insights into the suitability of the present mice model for nutritional or drug absorption studies in conditions of partially altered or injured intestinal mucosa.

Residuos de poda compostados y sin compostar: uso potencial como enmienda orgánica en suelo
Arrigo,Nilda M; Jiménez,María de la Paz; Palma,Rosa M; Benito,Marta; Tortarolo,Martía F;
Ciencia del suelo , 2005,
Abstract: land application of organic materials is a common practice in sustainable agriculture. our aim was i) to study the effect of the incorporation of organic material at different maturity stages on the ryegrass (lolium perenne l.) growth, and ii) to estimate the stage capable to produce the product more efficient in providing nitrogen to the plant nutrition. four compost samples consisted of pruning waste, leaves and grass clippings were selected from four different piles at different stages of the composting process: initial non-decomposed material, 2 months old at the end of the bio-oxidative stage, 7 months old during the maturation phase, and 12 months old at the end of the maturation phase. these compost samples were used to ryegrass growing assays, and they were also added to a clay silty soil. dry matter values were lower in t1 and t2 than in t3 and t4.similar results were quantified when the same materials were incorporated to a soil. nitrogen leaf content revealed that soil n immobilization had ocurred in t1 and t2 treatments. a compost, which had 7 months old during the maturation phase, did not cause any negative effect on the evaluated parameters. this compost seems to be sufficiently stable and its use would save time in compost process, compared with a compost 12 months old.
Biodegradable Chitosan/Multiwalled Carbon Nanotube Composite for Bone Tissue Engineering  [PDF]
Imelda Olivas-Armendariz, Santos Adriana Martel-Estrada, Mónica E. Mendoza-Duarte, Florinda Jiménez-Vega, Perla García-Casillas, Carlos A. Martínez-Pérez
Journal of Biomaterials and Nanobiotechnology (JBNB) , 2013, DOI: 10.4236/jbnb.2013.42025
Abstract:

In this work the influence of multiwalled carbon nanotubes (MWCNT) on mechanical properties was evaluated also the osteoinduction mechanism in Chitosan/MWCNT composite is reported. The morphology and the mechanical properties of the scaffolds were controlled by varying solvent ratios, quenching temperatures and carbon nanotubes concentration. In vitro cell culture of Sprague-Dawley rat’s osteoblasts was used to evaluate the phenotype expression of cells in the scaffolds. The presence of MWCNT in a chitosan matrix improving its mechanical properties and sustain osteoblast growth and differentiation that represent a potential application of the Chitosan/MWCNT as biomaterial for bone tissue engineering.

Synthesis and Characterization of Chitosan Nanoparticles Loaded Botanical Extracts with Antifungal Activity on Colletotrichum gloeosporioides and Alternaria species  [PDF]
Laura Leticia Barrera-Necha, Zormy Nacary Correa-Pacheco, Silvia Bautista-Ba?os, Mónica Hernández-López, Jorge Eduardo Martínez Jiménez, Aime Frida Morán Mejía
Advances in Microbiology (AiM) , 2018, DOI: 10.4236/aim.2018.84019
Abstract: In this study, chitosan nanoparticles (CSNPs) and chitosan nanoparticles- botanical extracts: EEA-CSNPs (ethanolic blueberry extract added chitosan nano-particles) and EMN-CSNPs (extract methanol of nanche added chitosan nano-particles) were characterized and evaluated in vitro ongrowth of Alternaria alternata isolated from Fig and Rosemary and Colletotrichum gloeosporioides isolated from Papaya and Soursop. From particle size distribution characteriza-tion, the size of nanoparticles increased after EEA incorporation. On the other hand, the smallest value of Z-average particle size was for the EMN-CSNPs. Zeta potential value decreased for CSNPs and EEA-CSNPs. However, when EMN is incorporated to CSNPs, the value is increased. From the results, it can be seen that the most stable suspension was EMN-CSNPs. After incorporation of Byrsonima crassifolia to CSNPs, no changes were observed in characteristic absorption bands for the FTIR spectra. However, after Vaccinium corymbosum incorporation to the CSNPs, changes were seen. For in vitro evaluation, CSNPs without EEA caused the total germination and sporulation inhibition of A. alternata from Rosemary. Incorporation of EMN to CSNPs improved the control of C. gloeosporioides with amycelial growth inhibition of 79% isolated from papaya and 82% isolated from soursop. In both isolated there were total germination inhibition. Overall, a synergistic effect between the chitosan and EMN was observed.
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