Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99


Any time

2019 ( 16 )

2018 ( 53 )

2017 ( 40 )

2016 ( 69 )

Custom range...

Search Results: 1 - 10 of 35931 matches for " Liliana; Martínez-Martínez "
All listed articles are free for downloading (OA Articles)
Page 1 /35931
Display every page Item
Factores asociados a la depresión en las grandes urbes. El caso del Distrito Federal en México
Ramírez-Ruiz,Liliana; Martínez-Martínez,Oscar Alfonso;
Revista Gerencia y Políticas de Salud , 2011,
Abstract: this paper analyzes the influence of different variables have on people living in the federal district and suffering from depression. the first hypothesis is oriented by international statistics to show that gender influences depression as variable, especially for females. the second hypothesis based on different theories shows a close relationship between income, age and poverty status on that condition. the results showed that income and age are important but not determinants of it, but education and gender were the most significant variables.
Sequentially Integrated Optimization of the Conditions to Obtain a High-Protein and Low-Antinutritional Factors Protein Isolate from Edible Jatropha curcas Seed Cake
Liliana León-López,Gloria Dávila-Ortiz,Cristian Jiménez-Martínez,Humberto Hernández-Sánchez
ISRN Biotechnology , 2013, DOI: 10.5402/2013/197201
Sequentially Integrated Optimization of the Conditions to Obtain a High-Protein and Low-Antinutritional Factors Protein Isolate from Edible Jatropha curcas Seed Cake
Liliana León-López,Gloria Dávila-Ortiz,Cristian Jiménez-Martínez,Humberto Hernández-Sánchez
ISRN Biotechnology , 2013, DOI: 10.5402/2013/197201
Abstract: Jatropha curcas seed cake is a protein-rich byproduct of oil extraction which could be used to produce protein isolates. The purpose of this study was the optimization of the protein isolation process from the seed cake of an edible provenance of J. curcas by an alkaline extraction followed by isoelectric precipitation method via a sequentially integrated optimization approach. The influence of four different factors (solubilization pH, extraction temperature, NaCl addition, and precipitation pH) on the protein and antinutritional compounds content of the isolate was evaluated. The estimated optimal conditions were an extraction temperature of 20°C, a precipitation pH of 4, and an amount of NaCl in the extraction solution of 0.6?M for a predicted protein content of 93.3%. Under these conditions, it was possible to obtain experimentally a protein isolate with 93.21% of proteins, 316.5?mg 100?g?1 of total phenolics, 2891.84?mg 100?g?1 of phytates and 168?mg 100?g?1 of saponins. The protein content of the this isolate was higher than the content reported by other authors. 1. Introduction Jatropha curcas is a tree of the Euphorbiaceae family which has been used, due to the high oil content (40–60%) of its seeds, as an alternative source of biodiesel [1]. The residual seed cake is a low-value byproduct left after oil extraction which, however, has a high protein content [2]. This seed cake, also, is highly toxic to a number of animal species due to the presence of different types of antinutritional components such as phytic acid, trypsin inhibitors, phenolic compounds, lectins (curcin), and saponins in high amounts [3, 4]. In addition to these, phorbol esters have been identified as one of the main compounds responsible for J. curcas toxicity [5]. These compounds are referred to as tigliane diterpenes in which two hydroxyl groups are esterified to fatty acids and are well known for their tumor promoting activity [6]. However, edible or nontoxic provenances have been reported to exist in Mexico [3, 7] which contain negligible amounts of phorbol esters though the levels of the other antinutritional compounds are similar to those found in the toxic varieties [8]. This would allow the seed meal from edible varieties to be processed and used as an economic source of protein for both humans and animals. Plant protein isolates are very important in the food industry due to their high protein contents, which can reach 90%. They are commonly prepared from oilseeds, legumes, and their defatted seed meals. The methods of preparation generally include the solubilization
General equilibrium long-run determinants for Spanish FDI: a spatial panel data approach
Jaime Martínez-Martín
SERIEs , 2011, DOI: 10.1007/s13209-011-0058-3
Abstract: While general equilibrium theories of trade stress the role of third-country effects, little work has been done in the empirical foreign direct investment (FDI) literature to test such spatial linkages. This paper aims to provide further insights into long-run determinants of Spanish FDI by considering not only bilateral but also spatially weighted third-country determinants. The few studies carried out so far have focused on FDI flows in a limited number of countries. However, Spanish FDI outflows have risen dramatically since 1995 and today account for a substantial part of global FDI. Therefore, we estimate recently developed spatial panel data models by maximum likelihood (ML) procedures for Spanish outflows (1993–2004) to top-50 host countries. After controlling for unobservable effects, we find that spatial interdependence matters and provide evidence consistent with new economic geography theories of agglomeration, mainly due to complex (vertical) FDI motivations. Spatial error models estimations also provide illuminating results regarding the transmission mechanism of shocks.
Properties of the Apathy Scale (AS) for use on Parkinson’s patients  [PDF]
Marcos Serrano-Due?as, Pablo Martínez-Martín, Tamara Merchán, Rosaura Bravo, Maite Serrano
Advances in Parkinson's Disease (APD) , 2013, DOI: 10.4236/apd.2013.22010
Abstract: Parkinson’s disease is a neurodegenerative disorder characterized by motor, autonomic, and neuropsychiatric symptoms, among the latter, apathy has been found to be present in up to 70% of patients. The main objective of the present study was to assess the psychometric properties of the Apathy Scale for evaluation of Ecuadorian patients with Parkinson’s. This was a cross sectional study, with re-test. There were 73 women (34.5%) in the final sample of 211 patients. Mean age was 67.5 ± 10.2 years, mean length of illness was 7.1 ± 5.5 years, and the mean ldopa dose was 656.1 ± 292.7 mg/day. The mean Apathy Scale score was 12.7 ± 7.1. Reliability: The Guttman’s λ obtained was 0.89. The SEM was 2.34 for the AS. The ICC using an absolute agreement definition was: ICC = 0.78 [(95% IC 0.73 - 0.82) f = 4.96; p ≤ 0.000]. Discriminative validity, analyzed with the Kruskal-Wallis statistic and using H&Y stages as segmentation variable registered an X(2) value of p < 0.0001. In conclusion the Apathy Scale proved to have suitable metric attributes in this specific PD patient sample: internal consistency, reliability, stability, and convergent and known-groups validity.
The SU(2)-character varieties of torus knots
Javier Martínez-Martínez,Vicente Mu?oz
Mathematics , 2012,
Abstract: Let G be the fundamental group of the complement of the torus knot of type (m,n). We study the relationship between SU(2) and SL(2,C)-representations of this group, looking at their characters. Using the description of the SL(2,C)-character variety of G, X(G), we give a geometric description of Y(G)\subset X(G), the set of characters arising from SU(2)-representations.
Classic Linear Methods Provisos Verification for Oscillator Design Using NDF and Its Use as Oscillators Design Tool  [PDF]
Angel Parra-Cerrada, Vicente González-Posadas, José Luis Jiménez-Martín, Alvaro Blanco
Circuits and Systems (CS) , 2013, DOI: 10.4236/cs.2013.41014

The purpose of this paper is to show the conditions that must be verified before use any of the classic linear analysis methods for oscillator design. If the required conditions are not verified, the classic methods can provide wrong solutions, and even when the conditions are verified each classic method can provide a different solution. It is necessary to use the Normalized Determinant Function (NDF) in order to perform the verification of the required conditions of the classic methods. The direct use of the NDF as a direct and stand-alone tool for linear oscillator design is proposed. The NDF method has the main advantages of not require any additional condition, be suitable for any topology and provide a unique solution for a circuit with independence of the representation and virtual ground position. The Transpose Return Relations (RRT) can be used to calculate the NDF of any circuit and this is the approach used to calculate the NDF on this paper. Several classic topologies of microwave oscillators are used to illustrate the problems that the classic methods present when their required conditions are not verified. Finally, these oscillators are used to illustrate the use and advantages of the NDF method.

Implementación de la educación bilingüe en el sistema educativo espa ol: hacia una educación de calidad europea
Yolanda Jiménez-Martínez,José María Mateo
Revista de Psicología y Educación , 2011,
Abstract: Desde el inicio de los tiempos uno de los retos del ser humano ha sido comunicarse con sus semejantes. Así, la adquisición del lenguaje y de lenguas ha sido una constante en la educación del individuo. Desde las teorías psicoevolutivas, los estudios lingüísticos o la lingüística aplicada, entre otros, el fenómeno del bilingüismo y plurilingüismo siempre ha estado vigente. En la actualidad, Europa está en permanente revisión y desarrollo de programas educativos que respondan a la necesidad de ciudadanos con competencia comunicativa suficiente en varias lenguas. En este esfuerzo, Espa a, en situación de desventaja con respecto a sus socios, está elaborando e implementando programas de gran calado para dar respuesta a la imparable demanda de planes que fomenten la adquisición y ense anza de lenguas. En este marco, se impone no olvidar el desafío de la escuela de calidad para todos. La inclusión no debe entrar en colisión con el aprendizaje y ense anza de segundas lenguas que, en muchos casos, se desarrollan en situaciones de bilingüismo.
Selective and constructive mechanisms contribute to neural circuit formation in the barrel cortex of the developing rat  [PDF]
Eileen Uribe-Querol, Eduardo Martínez-Martínez, Luis Rodrigo Hernández, Patricia Padilla Cortés, Horacio Merchant-Larios, Gabriel Gutiérrez-Ospinac
Advances in Bioscience and Biotechnology (ABB) , 2013, DOI: 10.4236/abb.2013.47103
Abstract: The cellular strategy leading to formation of neuronal circuits in the rodent barrel cortex is still a matter of controversy. Both selective and constructive mechanisms have been proposed. The selective mechanism involves an overproduction of neuronal processes and synapses followed by activity dependent pruning. Conversely, a constructive mechanism would increase the number of axons, dendrites, and synapses during development to match functionality. In order to discern the contributions of these two mechanisms in establishing a neuronal circuit in the somatosensory cortex, morphometric analysis of dendritic and axonal arbor growth was performed. Also, the number of synapses was followed by electron microscopy during the first month of life. We observed that axonal and dendritic arbors retracted distal branches, and elongated proximal branches, resulting in increased arbor complexity. This neuronal remodeling was accompanied by the steady increase in the number of synapses within barrel hollows. Similarly, the content of molecular markers for dendrites, axons and synapses also increased during this period. Finally, cytochrome oxidase activity rose with age in barrels indicating that the arbors became more complex while synapse density and metabolic demands increased. Our results support the simultaneous use of both selective and constructive mechanisms in establishing the barrel cortex circuitry.

Polyamide Fibers Covered with Chlorhexidine: Thermodynamic Aspects  [PDF]
E. Giménez-Martín, M. López-Andrade, J. A. Moleón-Baca, M. A. López, A. Ontiveros-Ortega
Journal of Surface Engineered Materials and Advanced Technology (JSEMAT) , 2015, DOI: 10.4236/jsemat.2015.54021
Abstract: Results of dynamic and equilibrium of sorption of a reactive dye Remazol Brilliant Blue, and a bactericidal agent, Digluconate of Chlorhexidine over Polyamide fibers are presented with the aim of supplying the fiber with bactericidal properties. However, adsorption of Chlorhexidine onto Polyamide is scarce due to the lack of interactions between the reactive groups of the fiber and the antiseptic molecule. Therefore, in order to provide the fiber surface with anionic groups, fiber has been previously dyed with Remazol Brilliant Blue which increases the negative charge of the fiber surface due to the presence of its sulfonate end groups. Thermodynamic parameters of equilibrium sorption in the two situations, fiber/dye and fiber-dye/Chlorhexidine, have been analyzed, as function of the temperature, pH and concentration of the dye in the pretreatment. Results show that when sorption of Remazol Brilliant Blue reaches the value of about 50 mmol/ kg at the higher temperature and concentration tested, the amount of Chlorhexidine adsorbed exhibits its maximum value which is 6 mmol/kg. Both processes, adsorption of Remazol Brilliant Blue and adsorption of Chlorhexidine, fit well to Langmuir adsorption model, suggesting the existence of some kinds of specific interactions between adsorbent and adsorbate. Thermodynamic functions show that the interaction is endothermic and spontaneous in all the rage of temperature tested. The kinetic studies show that sorption of Remazol Brilliant Blue is better described by pseudo-first order model, while sorption of Chlorhexidine fits better to pseudo-second order model, and seems to be quicker process. According to the obtained results, chemical interaction between the vinyl-sulfone group of Remazol Brilliant Blue and the amine groups of Polyamide fiber, followed by electrostatic interactions between the guanine group of the Chlorhexidine and the sulfonate group of the dye must be considered in order to explain the adsorption process.
Page 1 /35931
Display every page Item

Copyright © 2008-2017 Open Access Library. All rights reserved.