Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 241
Filtrar
2.
Clin Investig Arterioscler ; 34(3): 130-179, 2022.
Artículo en Inglés, Español | MEDLINE | ID: mdl-35090775

RESUMEN

One of the objectives of the Spanish Society of Arteriosclerosis is to contribute to better knowledge of vascular disease, its prevention and treatment. It is well known that cardiovascular diseases are the leading cause of death in our country and entail a high degree of disability and health care costs. Arteriosclerosis is a multifactorial disease and therefore its prevention requires a global approach that takes into account the different risk factors with which it is associated. Therefore, this document summarizes the current level of knowledge and includes recommendations and procedures to be followed in patients with established cardiovascular disease or at high vascular risk. Specifically, this document reviews the main symptoms and signs to be evaluated during the clinical visit, the laboratory and imaging procedures to be routinely requested or requested for those in special situations. It also includes vascular risk estimation, the diagnostic criteria of the different entities that are cardiovascular risk factors, and makes general and specific recommendations for the treatment of the different cardiovascular risk factors and their final objectives. Finally, the document includes aspects that are not usually referenced in the literature, such as the organization of a vascular risk consultation.


Asunto(s)
Arteriosclerosis , Enfermedades Cardiovasculares , Arteriosclerosis/complicaciones , Enfermedades Cardiovasculares/diagnóstico , Enfermedades Cardiovasculares/etiología , Enfermedades Cardiovasculares/prevención & control , Factores de Riesgo de Enfermedad Cardiaca , Humanos , Factores de Riesgo
4.
Nanoscale ; 13(26): 11488-11496, 2021 Jul 08.
Artículo en Inglés | MEDLINE | ID: mdl-34165111

RESUMEN

In this study, a new type of compact magnetic memristor is demonstrated. It is based on the variation of the conductivity of a nano-sized magnetic tunnel junction as a function of the angle between the in-plane reference layer magnetization and a free layer exhibiting an isotropic in-plane coercivity. The free layer magnetization is rotated by two spin transfer torque contributions: one originating from the in-plane magnetized reference layer and the other one from an additional perpendicular polarizer integrated in the stack. Thanks to a proper tuning of the relative influence of these two torques, the magnetization of the free layer can be rotated step by step clockwise or anticlockwise in a range of angle between 0° (parallel configuration) and 180° (anti-parallel configuration) by sending pulses of current through the stack, of one or opposite polarity. The amplitude of the rotation steps and therefore of the conductance variations depends on the pulse amplitude and duration. In this way, we achieve monotonous variations of the resistance with the voltage polarity through the application of pulses in the ns range. We also retrieve the analytical expression of critical current density which is found to be in good agreement with the experimental results. The thermal stability of the intermediate resistance levels and the role of Joule heating are also discussed.

6.
Artículo en Inglés | MEDLINE | ID: mdl-33884956

RESUMEN

Background: Nut allergy is a growing problem, but little is known about its onset in children. Objective: Characterize the onset of nut allergy in Southern European children. Methods: Consecutive patients up to 14years of age who presented to allergy departments with an initial allergic reaction to peanut, tree nut, or seed were included. An allergy workup including clinical history, food challenge, SPT, and whole-extract sIgE and ImmunoCAP 112-ISAC assay were performed. Results: Of the 271 children included, 260 were first diagnosed with nut allergy at age 6.5years, 11.8 (±21.2SD) months after the index reaction. The most common culprit nuts at onset were walnut (36.5%), peanut (28.5%), cashew (10.4%), hazelnut (8.5%), pistachio (5.4%), and almond (5%). Peanut-allergy onset was more frequent in children ≤6y.o. and walnut in those >6y.o. (p=0.032). In 65% of cases, the allergic reaction occurred the first time the patient consumed the nut, and 35% of reactions were anaphylactic. Overall, nut polysensitization was detected by SPT in 64.9% of patients, though this rate was lower among walnut- (54.7%) and peanut (54.1%)-allergic children (p<0.0001). Sensitization to 2S albumins was predominant (75%), specially Jug r1 (52.8%), whereas LTPs was less relevant (37%). Conclusion: In our population, the onset of nut allergy occured around 6years of age, slightly later than that reported in Anglo-Saxon countries. Walnut was the main trigger, followed by peanut and 2S albumins storage proteins, especially Jug r1, are the most relevant allergens. This study will help guide management and may contribute to preventive strategies in pediatric nut allergy.

7.
Phys Rev Lett ; 126(2): 027201, 2021 Jan 15.
Artículo en Inglés | MEDLINE | ID: mdl-33512209

RESUMEN

The spin absorption process in a ferromagnetic material depends on the spin orientation relative to the magnetization. Using a ferromagnet to absorb the pure spin current created within a lateral spin valve, we evidence and quantify a sizable orientation dependence of the spin absorption in Co, CoFe, and NiFe. These experiments allow us to determine the spin-mixing conductance, an elusive but fundamental parameter of the spin-dependent transport. We show that the obtained values cannot be understood within a model considering only the Larmor, transverse decoherence, and spin diffusion lengths, and rather suggest that the spin-mixing conductance is actually limited by the Sharvin conductance.

8.
Nanoscale ; 12(33): 17312-17318, 2020 Sep 07.
Artículo en Inglés | MEDLINE | ID: mdl-32789322

RESUMEN

The fabrication of multi-gigabit magnetic random access memory (MRAM) chips requires the patterning of magnetic tunnel junctions at very small dimensions (sub-30 nm) and a very dense pitch. This remains a challenge due to the difficulty in etching magnetic tunnel junction stacks. We previously proposed a strategy to circumvent this problem by depositing the magnetic tunnel junction material on prepatterned metallic pillars, resulting in the junction being naturally shaped during deposition. Upon electrical contact, the deposit on top of the pillars constitutes the magnetic storage element of the memory cell. However, in this process, the magnetic material is also deposited in the trenches between the pillars that might affect the memory cell behaviour. Here we study the magnetic interactions between the deposit on top of the pillars and in the trenches by electron holography, at room temperature and up to 325 °C. Supported by models, we show that the additional material in the trenches is not perturbing the working principle of the memory chip and can even play the role of a flux absorber which reduces the crosstalk between neighboring dots. Besides, in the studied sample, the magnetization of the 1.4 nm thick storage layer of the dots is found to switch from out-of-plane to an in-plane configuration above 125 °C, but gradually decreases with temperature. Electron holography is shown to constitute a very efficient tool for characterizing the micromagnetic configuration of the storage layer in MRAM cells.

9.
Nanotechnology ; 31(42): 425302, 2020 Jun 12.
Artículo en Inglés | MEDLINE | ID: mdl-32531768

RESUMEN

The all-optical magnetization reversal of magnetic layers, by picosecond optical pulses, is of particular interest as it shows the potential for energy-efficient and fast magnetic tunnel junction (MTJ) elements. This approach requires memory elements that are optically and electronically accessible, for optical writing and electronic read-out. In this paper, we propose the integration of indium tin oxide (ITO) as a transparent conducting electrode for magnetic tunnel junctions in integrated spintronic-photonic circuits. To provide light with sufficient energy to the MTJ free layer and allow electrical read-out of the MTJ state, we successfully integrated indium tin oxide as a top transparent electrode. The study shows that ITO film deposition by physical vapor deposition with conditions such as high source power and low O2 flow achieves smooth and conductive thin films. Increase in grain size was associated with low resistivity. Deposition of 150 nm ITO at 300 W, O2 flow of 1 sccm and 8.10-3 mbar vacuum pressure results in 4.8 × 10-4 Ω.cm resistivity and up to 80% transmittance at 800 nm wavelength. The patterning of ITO using CH4/H2 chemistry in a reactive ion etch process was investigated showing almost vertical sidewalls for diameters down to 50 nm. The ITO based process flow was compared to a standard magnetic tunnel junctions fabrication process flow based on Ta hard mask. Electrical measurements validate that the proposed process based on ITO results in properties equivalent to the standard process. We also show electrical results of magnetic tunnel junctions having all-optical switching top electrode fabricated with ITO for optical access. The developed ITO process flow shows very promising initial results and provides a way to fabricate these new devices to integrate all-optical switching magnetic tunnel junctions with electronic and photonic elements.

11.
SEMERGEN, Soc. Esp. Med. Rural Gen. (Ed. Impr.) ; 46(3): 186-193, abr. 2020. tab
Artículo en Español | IBECS | ID: ibc-196702

RESUMEN

INTRODUCCIÓN: La muerte forma parte de la vida. La conciencia de que la muerte es inevitable puede causar trastornos mentales. OBJETIVO: Determinar el nivel de ansiedad frente a la muerte en la gente mayor y su relación con la edad, el género, los aspectos sociales, la actividad física, el ocio, la autoestima, la religión y la enfermedad avanzada. Conocer sus preferencias respecto el lugar donde quieren morir. MATERIAL Y MÉTODO: Estudio observacional transversal. Entrevista estructurada y escala ansiedad frente la muerte Templer a 300 participantes sin diagnóstico de demencia seleccionados aleatoriamente entre población ≥75 años en cuatro centros de atención primaria. RESULTADOS: Un total de 288 entrevistas. Edad media 84,8 (DE: 15,2) años, 147 (51,0%) >85 años y 148 (51,4%) mujeres. El grado de ansiedad media-alta en la DAS fue mayor en las mujeres (50-39,6%; p = 0,030), en los que no realizaban actividad física (68-26,4%; p < 0,001), en los que no hacían actividades de ocio (63,5-41,7%; p = 0,007), en los pacientes con ánimo deprimido (60,4-41,6%; p < 0,008) y en los pacientes sin enfermedad crónica avanzada (48,3-35,8%; p = 0,036). La actividad física redujo 5,3 veces el riesgo de presentar ansiedad media/alta (OR=0,188; p < 0,001) y el cribado positivo para depresión la aumentó 2,9 veces (OR=2,943; p = 0,014). Un total de 255 (88,5%) afirmaron tener miedo a una muerte dolorosa; 177 (61,5%) prefieren morir en casa y 28 (9,7%) en el hospital. CONCLUSIONES: La gente mayor tiene miedo a sufrir una muerte dolorosa, aunque en general presenta niveles medios-bajos de ansiedad frente a ella. El género masculino y realizar actividades físicas/ocio se asocian a niveles más bajos de ansiedad. La enfermedad crónica avanzada produce mayor aceptación de la muerte. Predomina el deseo de morir en casa y deshospitalizar la muerte


INTRODUCTION: Death is part of life. The awareness that death is inevitable could be the cause of mental disorders. OBJECTIVE: To determine the level of death anxiety in old people as regards age, gender, social aspects, physical and leisure activities, self-esteem, religion or advanced disease, as well as their preferences on the place where they want to die. MATERIAL AND METHOD: Cross-sectional observational study. Face-to-face interviews and Death Anxiety Scale (DAS) of Templer on 300 patients over 75 years-old without a diagnosis of dementia, selected randomly in four health centres. RESULTS: A total of 288 surveys were completed. The mean age was 84.8 (15.2) years, and 147 (51.0%) were older than 85 years. The score of medium-high anxiety observed in the DAS was higher in women (50%-39.6%; P=.030), in those who did not perform physical activity (68%-26.4%; P<.001), in those who did not take part in leisure activities (63.5%-41.7%; P=.007), in patients with depressed mood (60.4%-41.6%; P<.008), and in patients without advanced disease (48.3%-3 5.8%; P=.036). The fear of having a painful death was present in 255 (88.5%). Physical activity reduced the risk of medium-high anxiety by 5.3 times (OR=.188, P<.001), and screening positive for depression increased it by 2.9 times (OR=2.943, P=.014). As regards the place where they would prefer to die, 177 (61.5%) answered «at home», and 28 (9.7%) «in the hospital.» CONCLUSIONS: Older people do fear a painful death, but they are not really afraid of dying. Male gender and performing physical or leisure activities is related to low levels of death anxiety. Advanced disease leads to greater acceptance of the end of life. The desire to die at home, and to «dehospitalise» the death prevails


Asunto(s)
Humanos , Masculino , Femenino , Anciano , Anciano de 80 o más Años , Actitud Frente a la Muerte , Ansiedad/psicología , Prioridad del Paciente , Estudios Transversales , Factores de Edad , Factores Sexuales , Depresión/psicología , Ejercicio Físico , Afecto , Religión y Psicología , Autoimagen , Encuestas y Cuestionarios
12.
Nanoscale ; 12(11): 6378-6384, 2020 Mar 21.
Artículo en Inglés | MEDLINE | ID: mdl-32134422

RESUMEN

The concept of Perpendicular Shape Anisotropy STT-MRAM (PSA-STT-MRAM) has been recently proposed as a solution to enable the downsize scalability of STT-MRAM devices beyond the sub-20 nm technology node. For conventional p-STT-MRAM devices with sub-20 nm diameters, the perpendicular anisotropy arising from the MgO/CoFeB interface becomes too weak to ensure thermal stability of the storage layer. In addition, this interfacial anisotropy rapidly decreases with increasing temperature which constitutes a drawback in applications with a large range of operating temperatures. Here, we show that by using a PSA based storage layer, the source of anisotropy is much more robust against thermal fluctuations than the interfacial anisotropy, which allows considerable reduction of the temperature dependence of the coercivity. From a practical point of view, this is very interesting for applications having to operate on a wide range of temperatures (e.g. automotive -40 °C/+150 °C).

13.
Lupus ; 29(3): 303-310, 2020 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-32031032

RESUMEN

Juvenile-onset systemic lupus erythematosus (JSLE) presents with an aggressive course and high morbidity associated with disease and treatment. JSLE patients have a poorer health-related quality of life (HRQoL) when compared with age-matched patients with other rheumatologic disorders. We aim to summarize the impact of current pharmacological therapies on the HRQoL of JSLE patients. Search strategies were developed across seven databases. Randomized clinical trials (RCTs) and cohort studies comparing interventions to standard therapy, placebo or pre-post cohort comparisons for more than 4 weeks were included. The outcome included self-reported scales compared at baseline and a therapeutic time point. Risk of bias was evaluated by using the Cochrane risk of bias tool and the Newcastle-Ottawa quality assessment scale. A total of 2812 articles were narrowed down to 309 for full-text screening. Four RCTs and one prospective cohort study, with a total of 634 JSLE patients, met the inclusion criteria. Four of the studies had a controlled intervention plus standard therapy compared with standard therapy alone or placebo. Multiple indices were used to evaluate HRQoL. These included the Pediatric Quality of Life Inventory, Childhood Health Assessment Questionnaire, Simple Measure of Impact of Lupus Erythematosus in Youngsters tool, Kids Fatigue Severity Scale and Child Depression Inventory. A single study reported a significant improvement while remaining studies reported no difference or failed to report the statistical analysis. Although HRQoL is significantly impaired in JSLE, evidence regarding its improvement is limited due to the small number of eligible studies, heterogeneity in scales, and HRQoL domains. A universal HRQoL questionnaire for JSLE needs to be established and used in both the research and clinical setting. All studies should adhere to reporting guidelines.


Asunto(s)
Antirreumáticos/uso terapéutico , Lupus Eritematoso Sistémico/tratamiento farmacológico , Calidad de Vida , Adolescente , Edad de Inicio , Humanos , Ensayos Clínicos Controlados Aleatorios como Asunto , Índice de Severidad de la Enfermedad
14.
Semergen ; 46(3): 186-193, 2020 Apr.
Artículo en Español | MEDLINE | ID: mdl-31901403

RESUMEN

INTRODUCTION: Death is part of life. The awareness that death is inevitable could be the cause of mental disorders. OBJECTIVE: To determine the level of death anxiety in old people as regards age, gender, social aspects, physical and leisure activities, self-esteem, religion or advanced disease, as well as their preferences on the place where they want to die. MATERIAL AND METHOD: Cross-sectional observational study. Face-to-face interviews and Death Anxiety Scale (DAS) of Templer on 300 patients over 75years-old without a diagnosis of dementia, selected randomly in four health centres. RESULTS: A total of 288 surveys were completed. The mean age was 84.8 (15.2) years, and 147 (51.0%) were older than 85years. The score of medium-high anxiety observed in the DAS was higher in women (50%-39.6%; P=.030), in those who did not perform physical activity (68%-26.4%; P<.001), in those who did not take part in leisure activities (63.5%-41.7%; P=.007), in patients with depressed mood (60.4%-41.6%; P<.008), and in patients without advanced disease (48.3%-3 5.8%; P=.036). The fear of having a painful death was present in 255 (88.5%). Physical activity reduced the risk of medium-high anxiety by 5.3 times (OR=.188, P<.001), and screening positive for depression increased it by 2.9 times (OR=2.943, P=.014). As regards the place where they would prefer to die, 177 (61.5%) answered «at home¼, and 28 (9.7%) «in the hospital.¼ CONCLUSIONS: Older people do fear a painful death, but they are not really afraid of dying. Male gender and performing physical or leisure activities is related to low levels of death anxiety. Advanced disease leads to greater acceptance of the end of life. The desire to die at home, and to «dehospitalise¼ the death prevails.


Asunto(s)
Ansiedad , Miedo , Anciano de 80 o más Años , Actitud Frente a la Muerte , Estudios Transversales , Femenino , Hospitales , Humanos , Masculino , Encuestas y Cuestionarios
15.
Lupus ; 28(3): 423-426, 2019 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-30678605

RESUMEN

OBJECTIVE: The objective of this report is to determine the impact of remission and low disease activity state (LDAS) on damage accrual and mortality in systemic lupus erythematosus (SLE) patients. PATIENTS AND METHODS: Visits from the Lupus in Minority populations: Nature vs. Nurture (LUMINA) cohort were categorized into remission (Systemic Lupus Activity Measure (SLAM) score = 0 and prednisone ≤ 5 mg/day and no immunosuppressants), LDAS ((not on remission), SLAM score ≤ 3, prednisone ≤ 7.5 mg/day, no immunosuppressants), or neither: active. Remission and LDAS visits were combined because of the relatively small number of remission visits. Their impact on damage accrual and mortality were examined by Poisson and logistic multivariable regressions adjusting for variables known to affect these outcomes. RESULTS: A total of 3879 visits for 558 patients (28% Caucasian, 37% African descent, 35% Hispanic) were studied. These visits corresponded to 71 in remission, 585 in LDAS, and 3223 active. The longer the percentage of time the patients were in remission/LDAS, the less damage accrual observed (rate ratio 0.1773 (95% confidence interval (CI) 0.1216 to 0.2584) p < 0.0001). A trend was observed in terms of mortality although statistical significance was not reached (odds ratio 0.303 (95% CI 0.063 to 1.456), p = 0.1360). CONCLUSIONS: The longer the patient's state on Remission/LDAS, the less damage accrual that occurs. The protective effect on mortality was not statistically significant.


Asunto(s)
Progresión de la Enfermedad , Lupus Eritematoso Sistémico/terapia , Evaluación de Resultado en la Atención de Salud , Inducción de Remisión , Adulto , Estudios de Cohortes , Femenino , Humanos , Inmunosupresores/uso terapéutico , Lupus Eritematoso Sistémico/mortalidad , Masculino , Persona de Mediana Edad , Prednisona/uso terapéutico , Índice de Severidad de la Enfermedad , Factores de Tiempo , Estados Unidos
16.
Bull Entomol Res ; 109(5): 583-594, 2019 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-30514408

RESUMEN

Three large saproxylic cerambycids with different pest/legal status co-occur in the Iberian oak woodlands, Cerambyx welensii (Cw), Cerambyx cerdo (Cc) and Prinobius myardi (Pm): Cw is an emerging pest, Cc is a protected but sometimes harmful species and Pm is a secondary/minor pest. A precise taxonomic diagnosis is necessary for research, management or protection purposes, but may be problematic mainly because Cw and Cc larvae are morphologically indistinguishable. To resolve this constraint, we genotyped adults, larvae and eggs collected over a wide geographical range using the mitochondrial barcoding of the cytochrome c oxidase subunit I (COI). A Neighbour-Joining tree phylogram revealed three distinct clusters corresponding to Cw, Cc and Pm. We further first sequenced for Cw and Cc two mitochondrial (12S rRNA and 16S rRNA) and one nuclear (28S rRNA) gene fragments. For the first two genes, interspecific divergence was lower than in COI, and for the 28S (lower mutation rate), the two species shared identical haplotypes. Two approaches for species delimitation (General Mixed Yule Coalescent (GMYC), Barcode Index Number (BIN)) confirmed the species distinctiveness of Cc and Cw. The Bayesian COI gene tree showed a remarkable genetic divergence between Cc populations from Iberia and the rest of Europe. Such divergence has relevant taxonomic connotations and stresses the importance of a wide geographical scale sampling for accurate DNA barcoding species identification. Incongruities between morphology/lineage and COI barcodes in some individuals revealed natural hybridization between Cw and Cc. Natural hybridization is important from a phylogenetic/evolutionary perspective in these cerambycids, but the prevalence of (and the behavioural/ecological factors involved in) interspecific cross-breeding remain to be investigated.


Asunto(s)
Escarabajos/clasificación , Escarabajos/genética , Animales , Código de Barras del ADN Taxonómico/métodos , Complejo IV de Transporte de Electrones/genética , Genes de Insecto , Genotipo , Hibridación Genética , Estadios del Ciclo de Vida/genética , Filogenia , ARN Ribosómico/genética , España , Especificidad de la Especie
17.
Hipertens. riesgo vasc ; 35(4): 177-184, oct.-dic. 2018. ilus, tab, graf
Artículo en Español | IBECS | ID: ibc-180578

RESUMEN

La contaminación atmosférica es un factor preocupante y con impacto sobre la salud pública. Múltiples estudios relacionan la exposición a contaminantes atmosféricos con el aumento de eventos cardiovasculares, mortalidad cardiovascular y mortalidad por todas las causas. También se ha demostrado relación entre el aumento de contaminación y la elevación de la presión arterial, así como con una mayor prevalencia de hipertensión arterial. Los contaminantes que desempeñan un papel más relevante en esta asociación son las partículas aéreas en suspensión, el dióxido de nitrógeno y el dióxido de azufre. El objetivo de esta revisión es entender los mecanismos implicados en este aumento y conocer las publicaciones más recientes que relacionan contaminación atmosférica, riesgo cardiovascular e hipertensión arterial


Air pollution is a worrying factor and has an impact on public health. Multiple studies relate exposure to air pollutants with an increase in cardiovascular events, cardiovascular mortality and mortality for all causes. A relationship has also been demonstrated between increased pollution and high blood pressure, as well as a higher prevalence of hypertension. Pollutants that play a more relevant role in this association are particulate matters, nitrogen dioxide and sulphur dioxide. The objective of this review is to understand the mechanisms involved in this increase and to find the most recent publications that relate pollution, cardiovascular risk and hypertension


Asunto(s)
Humanos , Contaminación del Aire/efectos adversos , Enfermedades Cardiovasculares/complicaciones , Hipertensión/complicaciones , Hipertensión/prevención & control , Calefacción/efectos adversos , Óxidos de Nitrógeno/efectos adversos , Óxidos de Nitrógeno/toxicidad , Dióxido de Azufre/efectos adversos , Dióxido de Azufre/toxicidad
18.
Nanoscale ; 10(25): 12187-12195, 2018 Jul 05.
Artículo en Inglés | MEDLINE | ID: mdl-29923577

RESUMEN

A new approach to increase the downsize scalability of perpendicular STT-MRAM is presented. It consists of significantly increasing the thickness of the storage layer in out-of-plane magnetized tunnel junctions (pMTJ) as compared to conventional pMTJ in order to induce a perpendicular shape anisotropy (PSA) in this layer. This PSA is obtained by depositing a thick ferromagnetic (FM) layer on top of an MgO/FeCoB based magnetic tunnel junction (MTJ) so that the thickness of the storage layer is of the order of or larger than the diameter of the MTJ pillar. In contrast to conventional spin transfer torque magnetic random access memory (STT-MRAM) wherein the demagnetizing energy opposes the interfacial perpendicular magnetic anisotropy (iPMA), in these novel memory cells, both PSA and iPMA contributions favor the out-of-plane orientation of the storage layer magnetization. Using thicker storage layers in these PSA-STT-MRAMs has several advantages. Due to the PSA, very high and easily tunable thermal stability factors can be achieved, even down to sub-10 nm diameters. Moreover, a low damping material can be used for the thick FM material thus leading to a reduction of the write current. The paper describes this new PSA-STT-MRAM concept, practical realization of such memory arrays, magnetic characterization demonstrating thermal stability factor above 200 for MTJs as small as 8 nm in diameter and possibility to maintain the thermal stability factor above 60 down to 4 nm diameter.

19.
Phys Rev Lett ; 120(16): 167201, 2018 Apr 20.
Artículo en Inglés | MEDLINE | ID: mdl-29756906

RESUMEN

We report the observation of spin-to-charge current conversion in strained mercury telluride at room temperature, using spin pumping experiments. We show that a HgCdTe barrier can be used to protect the HgTe from direct contact with the ferromagnet, leading to very high conversion rates, with inverse Edelstein lengths up to 2.0±0.5 nm. The influence of the HgTe layer thickness on the conversion efficiency is found to differ strongly from what is expected in spin Hall effect systems. These measurements, associated with the temperature dependence of the resistivity, suggest that these high conversion rates are due to the spin momentum locking property of HgTe surface states.

20.
Hipertens Riesgo Vasc ; 35(4): 177-184, 2018.
Artículo en Español | MEDLINE | ID: mdl-29703449

RESUMEN

Air pollution is a worrying factor and has an impact on public health. Multiple studies relate exposure to air pollutants with an increase in cardiovascular events, cardiovascular mortality and mortality for all causes. A relationship has also been demonstrated between increased pollution and high blood pressure, as well as a higher prevalence of hypertension. Pollutants that play a more relevant role in this association are particulate matters, nitrogen dioxide and sulphur dioxide. The objective of this review is to understand the mechanisms involved in this increase and to find the most recent publications that relate pollution, cardiovascular risk and hypertension.


Asunto(s)
Contaminación del Aire/efectos adversos , Enfermedades Cardiovasculares/etiología , Contaminantes Atmosféricos/toxicidad , Contaminación del Aire/legislación & jurisprudencia , Enfermedades Cardiovasculares/fisiopatología , Enfermedades Cardiovasculares/prevención & control , Salud Global , Humanos , Hipertensión/etiología , Hipertensión/fisiopatología , Concentración Máxima Admisible , Dióxido de Nitrógeno/toxicidad , Material Particulado/toxicidad , Factores de Riesgo , Dióxido de Azufre/toxicidad
SELECCIÓN DE REFERENCIAS
DETALLE DE LA BÚSQUEDA
...