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Search Results: 1 - 10 of 25037 matches for " Eduardo Mendizábal "
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Swelling Properties of New Hydrogels Based on the Dimethyl Amino Ethyl Acrylate Methyl Chloride Quaternary Salt with Acrylic Acid and 2-Methylene Butane-1,4-Dioic Acid Monomers in Aqueous Solutions  [PDF]
Issa Katime, Eduardo Mendizábal
Materials Sciences and Applications (MSA) , 2010, DOI: 10.4236/msa.2010.13026
Abstract: Hydrogels of dimethylaminoethyl acrylate methyl chloride quaternary salt (Q9) have been synthesized with different monomer ratio by copolymerization of this poorly studied monomer either with acrylic acid or with 2-methylene bu-tane-1,4-dioic acid. Hydrogel swelling was measured as a function of the composition of the hydrogel and of the crosslinking agent ratio. High values of swelling have been obtained at very high crosslinking values (< 14 wt %) and the equilibrium swelling was reached at very low time (less than 15 minutes). The swelling isotherms consisted of a steep initial portion and then levelled off as asymptotically to the equilibrium swelling limit. The experimental data suggest clearly that the swelling process obeys second-order kinetics. According to this, the kinetics rate constant and the equilibrium water content were determined at different comonomer composition and crosslinker concentration. The calculated kinetic constants ranged from 0.48 to 3.76 × 10-2 min-1 for poly (acrylic acid-co-Q9) hydrogels and from 0.68 to 4.0 × 10-2 min-1 for poly (2-methylene butane-1,4-dioic acid-co-Q9) hydrogels depending on the hydrogels composition. The diffusion process was evaluated for each hydrogel showing a non-Fickian type diffusion. In all cases was observed a considerable increase in diffusion coefficient as Q9 content increases.
Cationic Microemulsion Polymerization of Alkyl Acrylates  [PDF]
Issa Katime, Jesús Arellano, Eduardo Mendizábal, Jorge Flores
Materials Sciences and Applications (MSA) , 2010, DOI: 10.4236/msa.2010.15043
Abstract: Here we present the polymerization of n-butyl acrylate (BA), ethyl acrylate (EA) and methyl acrylate (MA) in tri-component microemulsions, using a cationic surfactant such as dodecyl trimetyl ammonium bromide in water, as a function of temperature, initiator type and, monomer and initiator concentration. The final latexes are transparent and blue color, with particle size ranging between 20 and 60 nm determined by quasielastic light scattering (QLD) and SEC molar masses of the order of 106 g/mol. Reaction times are short and reaction rates are high with final conversions between 70 and 98% depending on the monomer and the reaction conditions.
Hypertension in Metabolic Syndrome: Vascular Pathophysiology
Yolanda Mendizábal,Silvia Llorens,Eduardo Nava
International Journal of Hypertension , 2013, DOI: 10.1155/2013/230868
Abstract:
Hypertension in Metabolic Syndrome: Vascular Pathophysiology
Yolanda Mendizábal,Silvia Llorens,Eduardo Nava
International Journal of Hypertension , 2013, DOI: 10.1155/2013/230868
Abstract: Metabolic syndrome is a cluster of metabolic and cardiovascular symptoms: insulin resistance (IR), obesity, dyslipemia. Hypertension and vascular disorders are central to this syndrome. After a brief historical review, we discuss the role of sympathetic tone. Subsequently, we examine the link between endothelial dysfunction and IR. NO is involved in the insulin-elicited capillary vasodilatation. The insulin-signaling pathways causing NO release are different to the classical. There is a vasodilatory pathway with activation of NO synthase through Akt, and a vasoconstrictor pathway that involves the release of endothelin-1 via MAPK. IR is associated with an imbalance between both pathways in favour of the vasoconstrictor one. We also consider the link between hypertension and IR: the insulin hypothesis of hypertension. Next we discuss the importance of perivascular adipose tissue and the role of adipokines that possess vasoactive properties. Finally, animal models used in the study of vascular function of metabolic syndrome are reviewed. In particular, the Zucker fatty rat and the spontaneously hypertensive obese rat (SHROB). This one suffers macro- and microvascular malfunction due to a failure in the NO system and an abnormally high release of vasoconstrictor prostaglandins, all this alleviated with glitazones used for metabolic syndrome therapy. 1. Introduction The metabolic syndrome is a cluster of metabolic and cardiovascular symptoms that are strongly associated with type II diabetes mellitus. In this kind of diabetes, rather than prolonged high levels of glycemia, there is insulin resistance with secondary hyperinsulinemia, both very frequently associated with, hypertension, dyslipemia, atherosclerosis, and, most importantly, obesity (Figure 1) [1]. Vascular disorders are central to this condition. Quoting prof. Yki-J?rvinen “…after all, from a clinical point of view, type II diabetes mellitus is a disease of blood vessels, not muscle.” [2]. For these reasons, it is also known as cardiometabolic syndrome [1], and hypertension plays a pivotal role. Indeed, risk estimates according to the Framingham study show that roughly 80% of essential hypertension in men and 65% in women can be directly attributed to obesity [3]. There is a clear association between body mass index and arterial pressure even in nonobese, lean people [4–6]. Still, some obese people are not hypertensive. For example, the North American Pima Indians, who have a high prevalence of obesity, but do not have corresponding high rates of hypertension [7]. Figure 1: Two ways to
Avalia??o da resolu??o do supradesnivelamento do segmento st após angioplastia primária: registro multicêntrico de infarto agudo do miocárdio com supradesnivelamento do segmento ST na Argentina
Damonte, Aníbal A.;Lasave, Leandro;Kozak, Fernando;Rossi, Maximiliano;Gamen, Marcelo;Cura, Fernando;Berrocal, Daniel;Mendiz, Oscar;Picabea, Eduardo;
Revista Brasileira de Cardiologia Invasiva , 2009, DOI: 10.1590/S2179-83972009000400009
Abstract: background: the magnitude of st segment elevation resolution is a marker of myocardial reperfusion in patients presenting with acute myocardial infarction (ami). incomplete st segment elevation resolution (istsr) was identified as a predictor of unfavorable outcomes in ami patients after reperfusion therapy. the aims of our study were to describe the frequency of istsr in a contemporary registry of primary angioplasty (pci) and compare the in-hospital outcomes with patients with complete st segment elevation resolution (cstsr). method: from july 2008 to february 2009, we included 183 consecutive patients with ami (< 24hs) from eight centers in argentina to a prospective st-segment elevation myocardial infarction (stemi) registry. istsr was defined as a decrease < 70% of st elevation between the baseline electrocardiogram and the electrocardiogram carried out 60 minutes after pci. clinical, angiographic and procedural related variables were analyzed, as well as a composite endpoint of in-hospital cardiac events (ce) including mortality, reinfarction, shock, mechanical complications and urgent target vessel revascularization. results: incomplete resolution of st-segment elevation 60 minutes after angioplasty was observed in 89 patients (51.5%) whereas complete resolution was evident in 84 patients (48.5%). patients with suboptimal myocardial reperfusion had a higher rate of killip class >1 at presentation (33.7% vs. 19%; p = 0.04), left anterior descending artery as the infarct related artery (52.8% vs. 30.9%; p = 0.005), and diffuse disease in the infarct related artery (23.6% vs. 10.7%; p = 0.008), with a trend towards higher incidence of in-hospital cardiac events (14.6% vs. 5.9%; p = 0.08) and in-hospital mortality (11.2% vs. 3.6%; p = 0.08). multivariate analysis showed that the presence of killip class >1 at presentation (or 7.6; ci 95% 2.32-25.2; p = 0.0008) and complete st segment resolution (or 0.23; ci 95% 0.06-0.8; p = 0.02) were independent predictors of i
Una posible geografía de las identidades de Barcelona: El caso del barrio de la Vila de Gràcia
Mendizàbal,Enric;
Finisterra - Revista Portuguesa de Geografia , 2010,
Abstract: this article reflects upon barcelona?s social and territorial identities. the concept of ?identity? is presented in the introduction and discussed from a geographical perspective. the second part focuses on the various identities of the city of barcelona and of its districts. finally, the third part of the article discusses the case of the gràcia district - a particularly interesting example of a district with a strong specific identity in the context of a metropolis.
Current Archaeological Research in Panamá Viejo, Panamá
Tomás Mendizábal
Papers from the Institute of Archaeology , 1999, DOI: 10.5334/pia.138
Abstract: In late 1995 the government and private entities formed a pioneer organisation in Panamanian culture resource management, to deal with Panamá’s most salient archaeological site, Panamá Viejo. This association, the Patronato Panamá Viejo, was thus commissioned with the investigation and preservation of this 28-hectare site in the centre of modern Panamá City, as well as with keeping the community informed on the progress of the research. It is formed by four partners, the Instituto Nacional de Cultura and the Instituto Nacional de Turismo from the government, and the Kiwanis Club and the Banco del Istmo from the private sector. For the first time, an exclusively Panamanian non-profit organisation would confront this task on a large scale, with a multidisciplinary team of archaeologists, architects, and conservationists, with on-site facilities and laboratories aimed at an in depth study of Panamá’s historic and prehistoric past. This organisation is currently conducting extensive archaeological excavations on the site, protecting the stone monuments from further damage from natural and human elements, and trying to inform and educate the public on Panamá Viejo’s importance to the country’s historical and cultural heritage, and to develop it as a valuable tourist attraction.
La Delegación del CSIC en la Comunidad de Madrid: Un reto en un Estado de las Autonomías
Mendizábal, Teresa
Arbor : Ciencia, Pensamiento y Cultura , 2003,
Abstract: Desde su creación el CSIC ha tratado de estar próximo a las inquietudes y problemas de nuestra sociedad y esta voluntad se vio fortalecida tras la aprobación de nuestra Constitución. En este contexto, se presenta un recorrido en el tiempo de lo acontecido desde el establecimiento de la Delegación de Madrid en 1987 hasta la actualidad. Se describe la complejidad del sistema científico en esta Comunidad y las particulares circunstancias de los centros del CSIC. Se resalta el interés de la presidencia en el nombramiento de los delegados y se rese an sus funciones y la importancia del trabajo desarrollado.
Una posible geografía de las identidades de Barcelona. El caso del barrio de la Vila de Gràcia
Enric Mendizàbal
Finisterra - Revista Portuguesa de Geografia , 2010,
Abstract: A geography of the identities of Barcelona. The case of Gràcia district. This article reflects upon Barcelona’s social and territorial identities. The concept of “identity” is presented in the introduction and discussed from a geographical perspective. The second part focuses on the various identities of the city of Barcelona and of its districts. Finally, the third part of the article discusses the case of the Gràcia district – a particularly interesting example of a district with a strong specific identity in the context of a metropolis.
Oficios, labores y fiscalidad de los mudéjares peninsulares: notas distintivas en Castilla y Aragón (ss. XIII-XVI)
Mendizábal,María Florencia;
Cuadernos de historia de Espa?±a , 2008,
Abstract: the objective of the article is to analyze, from the point of view of social history, socio-professional and fiscal matters concerning mudéjares in the peninsular kingdoms during the late middle ages and beginnings of modernity. for such aim we chose, in one first instance, to examine the moors' works and occupations in urban and rural spaces of the castilian-aragonese and valencian areas. a second section is devoted to study fiscal matters regarding mudéjares in the context of feudal society, focusing on changes occurred after the conquest of granada for the castilian sphere, and the varied taxes in aragón and valencia.
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