Search results for " GaN"
showing 10 items of 417 documents
Glaucoma and Antioxidants: Review and Update
2020
Glaucoma is a neurodegenerative disease characterised by the progressive degeneration of retinal ganglion cells. Oxidative stress has been related to the cell death in this disease. Theoretically, this deleterious consequence can be reduced by antioxidants substances. The aim of this review is to assemble the studies published in relation to antioxidant supplementation and its effects on glaucoma and to offer the reader an update on this field. With this purpose, we have included studies in animal models of glaucoma and clinical trials. Although there are variable results, supplementation with antioxidants in glaucoma may be a promising therapy in glaucoma.
Understanding the Role of Sensorimotor Beta Oscillations
2021
Beta oscillations have been predominantly observed in sensorimotor cortices and basal\ud ganglia structures and they are thought to be involved in somatosensory processing\ud and motor control. Although beta activity is a distinct feature of healthy and pathological\ud sensorimotor processing, the role of this rhythm is still under debate. Here we review\ud recent findings about the role of beta oscillations during experimental manipulations (i.e.,\ud drugs and brain stimulation) and their alteration in aging and pathology. We show how\ud beta changes when learning new motor skills and its potential to integrate sensory input\ud with prior contextual knowledge. We conclude by discussing a n…
2002
Previous observations have suggested a role for nitric oxide in the activity of the globus pallidus, but this functional involvement has not yet been tested in vivo. The extracellular activity of single units of the globus pallidus was recorded, and neuronal nitric oxide synthase was inhibited by systemically administering 7-nitro-indazole to a group of anaesthetised rats. Forty-five per cent of cells responded with a decrease in the firing rate. In another group of rats, the microiontophoretic administration of 3-morpholino-sydnonimin-hydrocloride (a nitric oxide donor) induced an increase in neuronal firing rate (24/28 cells), whereas the administration of Nω-nitro-L-arginine methyl ester…
Akadēmiskā Dzīve, 48.krājums
2012
Influence of electrodes layout on hydrothermally-grown GaN/ZnO LEDs
2017
Light-emitting diodes (LEDs) based on zinc oxide, with wide direct band gap, have drawn much attention in the last years. ZnO, which is natural n-type, has excellent physical and chemical properties, is inexpensive, abundant and nontoxic. Unfortunately, the preparation of reproducible and high quality p-type ZnO film is comparatively difficult, due to the low solubility of acceptor dopants, self-compensating effects, and acceptor level energy height. Although many groups have reported on ZnO-based homostructure LEDs, the results are controversial as recently reviewed in [1]. Hence, heterojunction LEDs based on ZnO as the nside and GaN as the p-side of the junction have been put forward [2].…
Electrocatheter-mediated High-voltage Pulsed Radiofrequency of the Dorsal Root Ganglion in the Treatment of Chronic Lumbosacral Neuropathic Pain
2019
Objectives:Despite the interest in scientific community, there is still poor evidence about pulsed radiofrequency (PRF) efficacy in the treatment of neuropathic pain. In order to determine whether high-voltage PRF and epidural adhesiolysis (PRF-EA) showed better results than epidural adhesiolysis al
Uso de la ecografía con contraste en el diagnóstico y manejo de la colecistitis aguda gangrenosa
2017
INTRODUCCIÓN La colecistitis aguda gangrenosa es considerada un verdadero reto para el cirujano general, no ya solo por la dificultad diagnóstica de la misma, sino por la necesidad de un tratamiento rápido y agresivo, por lo que en muchas ocasiones está asociado a una mayor morbilidad y mortalidad perioperatoria. La colecistitis gangrenosa es una evolución de la colecistitis aguda y suele observarse cuando se produce un retraso en el diagnóstico desde el inicio de los síntomas. El aumento de la tensión de la pared vesicular secundario a la obstrucción persistente del conducto cístico acarrea una lesión en el epitelio debido a la insuficiencia vascular subyacente. Estos cambios son los causa…
El papel de la liquidez en el efecto de la nueva información. El caso de Latibex
2017
En 1999 se creó en España el mercado Latibex destinado a la contratación en euros de valores de las principales empresas latinoamericanas. Desde su creación este mercado se ha caracterizado por tener una menor actividad negociadora y menor liquidez que la existente en los mercados latinoamericanos de origen. El objetivo del trabajo es analizar si el efecto de la información trasmitida por el anuncio de ganancias trimestrales es diferente en ambos mercados, considerando los diferentes niveles de liquidez y actividad negociadora que presentan ambos mercados.Los resultados obtenidos confirman que el anuncio de ganancias es una información relevante para el valor de la empresa. Sin embargo, es …
La disobbedienza civile tra testimonianza ed efficia
2005
In questo articolo si espongono tre modelli normativi delle pratiche di disobbedienza civile, rispettivamente i modelli proposti da Thoreau, Gandhi e Rawls. Nel saggio si mostra come i tre modelli non riescono a contemperare due desiderata della giustificazione di una pratica di disobbedienza civile: l'essere sia una manifestazione di serietà di un impegno, che per tanto intende essere un modello per gli altri cittadini, sia una strategia efficace per la eliminazione, o la riduzione del danno derivante da, norme ingiuste.
A case report of double etiology of ecthyma gangrenosum
2019
Abstract Rationale: Ecthyma gangrenosum is a cutaneous infection, most commonly occurring during sepsis evolution with Pseudomonas aeruginosa on an immunocompromised background. There have been rare case reports in previously healthy children and rarer are the cases with double etiology. Patient concerns: We present the case of a female Caucasian patient, aged 1 year and 8 months, who developed severe sepsis during flu evolution with predominant respiratory and cerebral manifestations. On admission, at skin level, there was noticed a necrotic coccygeal ulceration (with rapid increasing dimensions 0.5/0.5 cm in 24 hours), and with the transformation from a dry necrosis in a sphacelus at the …