oalib

OALib Journal期刊

ISSN: 2333-9721

费用:99美元

投稿

时间不限

2019 ( 9 )

2018 ( 45 )

2017 ( 40 )

2016 ( 66 )

自定义范围…

匹配条件: “Menéndez-Navarro” ,找到相关结果约38113条。
列表显示的所有文章,均可免费获取
第1页/共38113条
每页显示
The politics of silicosis in interwar Spain: Republican and Francoist approaches to occupational health
Menéndez-Navarro,Alfredo;
Dynamis , 2008, DOI: 10.4321/S0211-95362008000100004
Abstract: this article explores the emergence and recognition of silicosis as an occupational disease in interwar spain. following international labour office guidelines, growing international concerns and local medical evidence, republican administrators provided the first health care facilities to silicosis sufferers, who eventually became entitled to compensation under the law of occupational diseases (1936), poorly implemented due to the outbreak of the civil war (1936-39). silicosis became a priority issue on the political agenda of the new dictatorial regime because it affected lead and coalmining, key sectors for autarchic policies. the silicosis scheme (1941) provided compensation for sufferers, although benefits were minimised by its narrow coverage and the application of tight criteria.
La literatura médica espa ola sobre los riesgos del amianto durante el franquismo
Menéndez-Navarro, Alfredo
Asclepio : Revista de Historia de la Medicina y de la Ciencia , 2012,
Abstract: Asbestos is a fibrous mineral used since the early 20th century in a wide range of manufacturing processes and industrial products for its fireproofing and abrasion-resistant properties. Asbestos exposure has had harmful effects on the health of workers and of the general population. Asbestos risks have attracted scant historiographical attention in Spain, contributing to the idea of a lack of medical and public concerns about this issue until the 1980s. The aim of this paper was to analyze the emergence of such concerns during the Franco regime by exploring the medical literature and the legislation drafted to address asbestos hazards. El amianto o asbesto es un mineral fibroso de propiedades ignífugas y resistente a la abrasión que ha sido empleado masivamente en procesos industriales y productos manufacturados desde comienzos del siglo XX. Su uso ha provocado graves problemas de salud en los trabajadores expuestos y en la población general. La atención historiográfica a los riesgos del amianto en Espa a ha sido casi inexistente, lo que ha contribuido a consolidar la idea de una ausencia de preocupación por este problema en nuestro país hasta la década de los ochenta. El objetivo de este trabajo es analizar el surgimiento de dicha preocupación durante el periodo franquista, mediante un análisis de la producción científica y de la normativa aprobada para enfrentar los riesgos del amianto.
Molecular Dynamics of Free and Graphite-Supported Pt-Pd Nanoparticles  [PDF]
Carlos Fernández-Navarro, Sergio Mejía-Rosales
Advances in Nanoparticles (ANP) , 2013, DOI: 10.4236/anp.2013.24044
Abstract:

The thermal characteristics of bimetallic Pt-Pd nanoparticles, both free and graphite-supported, were investigated through molecular dynamics simulations using quantum Sutton-Chen many-body potentials for the metal-metal interactions. The graphite substrate was represented as layers of fixed carbons sites and modeled with the Lennard-Jones potential model. The melting temperatures for bimetallic nanoparticles were estimated based on variations in thermodynamic properties such as potential energy and heat capacity. Melting temperatures of the nanoparticles were found to be considerably lower than those of bulk Pt and Pd. The Pt-Pd clusters exhibited a two-stage melting, where surface melting of the external atoms is followed by homogeneous melting of the internal atoms. The melting transition temperature was found to increase when the particle is on the graphite support, with an increase at least 180 K higher than that of the same-sized free nanoparticle. The results of the density distributions perpendicular to the surface indicate that the Pd atoms have a tendency to remain at the surface, and the Pd atoms wet the graphite surface more than the Pt atoms, while root mean squares suggest that surface melting starts from the cluster surface, and surface melting was seen in both free and graphite-supported nanoparticles. Structural changes accompanying the thermal evolution were studied by the bond-orientational order parameter method.

El arte contemporáneo entre la experiencia, lo antivisual y lo siniestro
Miguel á. Hernández-Navarro
Revista Observaciones Filosóficas , 2006,
Abstract: Existe en el arte reciente una desmedida pasión por lo real. Una fascinación que se presenta bajo un rostro janeiforme: por un lado, como un intento de subversión y transgresión de las reglas del contexto artístico para llegar al mundo real, y, por otro, como una tentativa de abolir las reglas sociales para llegar a un estadio preedípico más allá de la ley y la cultura. Si se observa bien, estos dos modos de presentación de lo real coincidirían, en primer lugar, con una suerte de pasión por la realidad , la esfera de las cosas y la experiencia del mundo de vida, tal y como fue intuida por Michel de Certeau ( L'Invention du quotidien. París, Gallimard, 1990); y, en segundo, con la desmedida pasión por lo real del siglo XX atisbada por Alain Badiou, para quien lo Real, en sentido lacaniano, es aquello que fractura la realidad para poner las cosas en su lugar ( El siglo . Buenos Aires, Manantial, 2005).Aun a riesgo de simplificar demasiado, podríamos decir que lo real aparece en el arte contemporáneo de dos maneras no tan radicalmente opuestas como se podría pensar a primera vista: como un intento de presentar la realidad más allá del arte, y como un intento de presentar lo real del sujeto más allá de la cultura. Dos movimientos de alejamiento. El primero pretende bajarse del arte para entrar en la vida cotidiana, y el segundo, bajarse del mundo real para penetrar en lo que hay más allá de las convenciones culturales.En este breve ensayo, me gustaría plantear algunas cuestiones referentes a estos dos modos de lo real , nunca con la intención, ni mucho menos, de sentar cátedra, sino, más bien, con la de trazar algunas posibles líneas fuga para posteriores trabajos más extensos y sosegados. Pasaré, eso sí, un poco de puntillas sobre la pasión por la realidad , para tratar con mayor énfasis el arte de lo Real, intentando proponer, a la luz de la idea de antivisión y del concepto freudiano de lo siniestro , una mirada alternativa –complementaria – a las prácticas artísticas analizadas por Hal Foster en su célebre El retorno de lo real.
Habitar la Huella
Miguel á. Hernández-Navarro
Antipoda. Revista de Antropología y Arqueología , 2011,
Abstract:
Protective Effect of Phenolic-Rich Extracts from Different Parts of Opuntia joconostle Fruit against Carbon Tetrachloride-Induced Oxidative Stress in Mice  [PDF]
Obed Osorio-Esquivel, Alicia Ortiz-Moreno, Julieta Herrera-Martínez, María Dolores Hernández-Navarro
Journal of Biomaterials and Nanobiotechnology (JBNB) , 2013, DOI: 10.4236/jbnb.2013.43A005
Abstract:

Opuntia joconostle fruit is a rich source of biocompounds such as polyphenols including gallic, vanilic, 4-hidroxybenzoic, cafeic, and syringic acids, catechin, epicatechin, rutin, and vanillin, besides betalains. The objective of this research was to evaluate the effect of supplementation polyphenols-rich extracts from different parts of Opuntia joconostle against carbon tetrachloride-induced oxidative stress in a mouse model. The animals were treated orally with polyphenols-rich extracts at 50, 100 and 200 mg/kg BW for 30 consecutive days. On day 30th the mice received carbon tetrachloride (CCl4) as hepatoxic agent. Biochemical evaluations were carried out 24 h after induction of the oxidative stress. Data showed that methanolic extracts from different parts of Opuntia joconostle exerting protective effect against the CCl4-induced oxidative stress in mice. Histology examination revealed that the damage decreased in groups treated with polyphenols-rich extracts compared to the group that did not receive any treatment. Opuntia joconostle fruit contains many phenolic compounds, flavonoids and betalains. The protective effect of extracts may be related to the phenolic composition and also by a counteraction with other compounds, such as betalains and flavonoids that increase their antioxidant effect.

Manejo, prevención y control de la anemia megaloblástica secundaria a déficit de ácido fólico
Paz,R. de; Hernández-Navarro,F.;
Nutrición Hospitalaria , 2006,
Abstract: folic acid deficiency is the second most common cause of anemia in our environment, after anemia secondary to iron deficiency. folates are essential components of human and animal diet. folic acid is mainly in poliglutamate form, and it is hydrolyzed in the proximal jejunum. it is important to identify adequately the exact vitamin deficiency that causes megaloblastic anemia, because vitamin b12 administration in folate deficiency may correct partially megaloblasticalterations, but administration of folic acid in cobalamin deficient patients improves haematological parameters but deteriorates the neurological syndrome. main causes of anemia secondary to folate deficiency are inadequate dietetic administration, increased requirements, impaired absorption and pharmacologic interactions. folates are altered by light, high temperature and by water affinity, which facilitates its elimination by washing or cooking.
Manejo, prevención y control de la anemia perniciosa
Paz,R. De; Hernández-Navarro,F.;
Nutrición Hospitalaria , 2005,
Abstract: pernicious anemia is the most frequent cause of megaloblastic anemia in our area, and it is the result of a vitamin b12 deficiency due, itself, to the de-crease or absence of intrinsic factor (if) because of gastric mucosa atrophy or autoimmune destruction of if-producing parietal cells. with the existence of a severe gastric atrophy, there is a decrease in acid and if production and a further change in vitamin b12 absorption. fifty percent of the cases are associated to anti-if antibodies, which presence in other autoimmune diseases is exceptional. in patients with pernicious anemia, measurement of anti-if antibodies has high specificity (95%); however, measurement of anti-parietal cells antibodies has low specificity. the first-choice treatment is adminis-tration of vitamin b12 intramuscularly. the regimen is the administration of 1 mg of vitamin b12 daily for one week, weekly thereafter for one month and, then, every 2-3 months for life.
Manejo, prevención y control del síndrome anémico secundario a deficiencia férrica
Paz,R. de; Hernández-Navarro,F.;
Nutrición Hospitalaria , 2005,
Abstract: anemia secondary to iron deficiency is the most frequent anaemia in our environment, the first cause of consultation in haematology and the most common nutritional problem. it is characterized by a diminution or absence of iron deposits. the ultimate test that confirms the diagnosis of anaemia secondary to iron deficiency is a low serum level of ferritin, which indicates iron depletion. other parameters do not allow to distinguish iron deficiency anaemia from other chronic derangements. diet is of utmost importance in anaemia. there is not a single food product with sufficient concentration of iron capable of restoring iron deficiency situations. therefore, treatment of iron deficiency must be made orally with iron preparates, mainly in the form of iron sulphate in order to guarantee a better absorption. the initial recommended doses are 150-200 mg of elemental iron per day split in three ingestions (in children 3-5 mg/kg/day).
Manejo, prevención y control de la anemia perniciosa Management, prevention and control of pernicious anemia
R. De Paz,F. Hernández-Navarro
Nutrición Hospitalaria , 2005,
Abstract: La anemia perniciosa es la causa más frecuente de anemia megaloblástica en nuestro medio y es consecuencia de una deficiencia de vitamina B12 debido a su vez a la disminución o ausencia de factor intrínseco (FI) por atrofia de la mucosa gástrica o por destrucción autoinmune de las células parietales productoras de éste. Ante la existencia de una atrofia gástrica intensa, se origina un descenso en la producción de ácido y FI y una posterior alteración en la absorción de vitamina B12. En un 50% de los casos se asocia a anticuerpos anti FI, cuya presencia en otras enfermedades auto-inmunes es excepcional. En pacientes con anemia perniciosa la determinación de anticuerpos anti FI tiene una alta especificidad (95%), sin embargo, la determinación de anticuerpos anticélulas parietales cuentan con una especificidad baja. El tratamiento de elección es la administración de B12 intramuscularmente. La pauta consiste en administrar 1 mg. de Vitamina B12 diariamente durante una semana, posteriormente semanal durante un mes y después cada 2-3 meses de por vida. Pernicious anemia is the most frequent cause of megaloblastic anemia in our area, and it is the result of a vitamin B12 deficiency due, itself, to the de-crease or absence of intrinsic factor (IF) because of gastric mucosa atrophy or autoimmune destruction of IF-producing parietal cells. With the existence of a severe gastric atrophy, there is a decrease in acid and IF production and a further change in vitamin B12 absorption. Fifty percent of the cases are associated to anti-IF antibodies, which presence in other autoimmune diseases is exceptional. In patients with pernicious anemia, measurement of anti-IF antibodies has high specificity (95%); however, measurement of anti-parietal cells antibodies has low specificity. The first-choice treatment is adminis-tration of vitamin B12 intramuscularly. The regimen is the administration of 1 mg of vitamin B12 daily for one week, weekly thereafter for one month and, then, every 2-3 months for life.
第1页/共38113条
每页显示


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