Search results for "Pont"

Duodenal contractile activity in dystrophic (mdx) mice: reduction of nitric oxide influence.

2003

The present study was undertaken to analyse duodenal contractility in adult dystrophic (mdx) mice. The spontaneous changes of the isometric tension and the responses of longitudinal duodenal muscle to nonadrenergic, noncholinergic (NANC) nerve stimulation and to exogenous drugs were compared between normal and mdx mice. Duodenal segments from mdx mice displayed spontaneous contractions with higher frequency than normals. N omega-nitro-L-arginine methyl ester (L-NAME) increased the frequency of contractions in normals without affecting that in mdx mice. In normals, NANC nerve stimulation elicited a transient relaxation abolished by L-NAME. In mdx mice a frank relaxation was not observed, the…

Ultrastructural causes of rupture of hand tendons in patients with rheumatoid arthritis. A transmission and scanning electron microscopic study.

1993

To identify the cause of rupture of hand tendons in patients with rheumatoid arthritis, we studied the underlying ultrastructural changes of the collagenous fibril systems. Samples of the flexor digitorum superficialis (n = 12) and the extensor digitorum communis (n = 20) were taken during tenosynovectomy. Tendons dissected at necropsy (n = 30) served as controls. Specimens were analysed by transmission and scanning electron microscopy. Interfibrillar dysplastic fibrils, "Luse bodies", and intracellular collagen were found in rheumatoid tissues. The diameters of collagen fibrils were significantly reduced compared with the control group (p0.01). The duration of the disease usually correlate…

Impaired geometric properties of tibia in older women with hip fracture history.

2007

This study evaluated side-to-side differences in tibial mineral mass and geometry in women with previous hip fracture sustained on average 3.5 years earlier. Both tibial mineral mass and geometry were found to be reduced in the fractured leg. INTRODUCTION: The purpose of this study was to evaluate side-to-side differences in tibial mineral mass and geometry after hip fracture and to assess the determinants of such differences. METHODS: Thirty-eight 60- to 85-year-old women with a previous hip fracture and 22 same-aged control women without fractures participated in the study. Bone characteristics of the distal tibia and tibial shaft of both legs were assessed using pQCT in order to compare …

Optoelectronic devices based on caesium lead halide perovskite nanocrystals

2020

Tradicionalmente, la implementación de materiales activos en circuitos fotónicos integrados se ha basado en la utilización de semiconductores III-V y vidrios y materiales ferroeléctricos dopados con iones de tierras raras. Sin embargo, en la actualidad existe una alternativa basada en (nano) materiales sintetizados por técnicas de química coloidal. La posibilidad de procesar nanomateriales en solución permite fabricar semiconductores con propiedades ópticas (emisión, absorción, dispersión de luz) que pueden diseñarse durante la síntesis. Además, su naturaleza coloidal permite integrarlas en cualquier arquitectura óptica mediante sencillas técnicas de impresión en tinta. En este contexto, lo…

Biodiverse green roofs in Mediterranean climate. Input and lessons learned from Germany and Switzerland

In the realm of the doctoral program in technologies for sustainability and land restoration, this thesis deepens sustainable and ecological solutions for Mediterranean environment after the German tradition and the Swiss school of green roofs for biodiversity. Specific aims were to: (1) assess the effectiveness of the existing green roofs norms in supporting biodiversity; (2) review methodologies and approaches for the implementation of biodiverse green roofs but also their application for ecological design; (3) identify habitat templates in the Mediterranean ecoregion replicable on green roofs; and (4) investigate the long term vegetation development of unmanaged green roofs in order to g…

Footbridge design in Viale Regione Siciliana in Palermo

2007

The paper investigates some solutions designed by the author, as structural consulting engineer of the municipal administration of Palermo, to build a footbridge over Viale Regione Siciliana, in the section between Via Perpignano and Viale Leonardo Da Vinci. The pedestrian underpass put in place in the 1990s, during the construction of the new road, was considered to be unsatisfactory for pedestrian safety due to possible robberies. In the last few years the administration has been oriented towards the creation of footbridges, designed to be accessible to the differently abled too. This is possible in relationship to the definitive abandonment of the project of a flyover. The paper shows so…

Organiskā cietvielu lāzera aktīvās vides izveide, kurā tiek izmantota Forstera rezonanses enerģijas pārnese

2022

Šajā darbā tiek pētīti divi Alq3 atvasinājumi un PVK kombinācijā ar četriem DCM atvasinājumiem. Pētītie savienojumi ar rotējošā diska metodi no šķīduma var veidot amorfas plānas kārtiņas. Tika izmērītas šādas paraugu optiskās īpašības: absorbcijas un emisijas spektri, fotoluminescences kinētika un kvantu iznākums. Labākajām sistēmām tika veikti pastiprinātas spontānās emisijas (ASE) mērījumi. Plāno kārtiņu absorbcijas un emisijas mērījumi liecina, ka FRET starp Alq3 un DCM molekulām ir iespējama Alq3 emisijas spektra un DCM absorbcijas spektra pārklāšanās dēļ. No iegūtajiem datiem var secināt, ka dažām sistēmām FRET varētu būt ar 100% efektivitāti. Izmērītās ASE ierosmes sliekšņa enerģijas …

Jaunu sintēzes stiklu veidojošu piraniliden atvasinājumu gaismas pastiprināšanas īpašību pētījumi

2020

Organiskie savienojumi tiek pētīti jau vairākas desmitgades un tiem ir atrasti pielietojumi gaismas emitējošās diodēs, saules šūnās, tranzistoros u.c. Neskatoties uz to, ka organiskie materiāli jau vairākas desmitgades ir izmantoti krāsvielu lāzeros, tomēr notiek intensīvi pētījumi šo materiālu izmantošanā cietvielu organiskajos lāzeros. Pasaulē ir veikti daudzi pētījumi, cenšoties atrast jaunus organiskos savienojumus ar labākām optiskajām īpašībām, lai radītu gaismas pastiprinātājus. Šajā darbā tika pētītas 12 jauni sintezētu organisko savienojumu optiskās īpašības ar mērķi atklāt savienojumus, kurus varētu izmantot lāzera aktīvajā vidē. Lai noskaidrotu vielu piemērotību tika veikti spont…

Estudio de la influencia de la técnica y el material de sutura en la exposición prematura del tornillo de cierre en implantes sumergidos

2018

Objetivo: El objetivo principal fue determinar con qué técnica de sutura (anudado simple o doble), y con qué tipo de sutura (sintética o seda), se presentaban menos exposiciones de los tornillos de cierre de los implantes dentales tras las cirugías. Metodología: Se realizó un estudio experimental para investigar si se pueden prevenir y/o eliminar las exposiciones prematuras con un protocolo quirúrgico de colocación de implantes que incluya unas técnicas y unos materiales de sutura que el clínico pueda utilizar de forma habitual. Se seleccionaron pacientes de forma aleatoria para incluirlos en cuatro grupos diferentes (1= grupo sutura seda-simple, 2= grupo sutura seda-doble, 3= grupo sutura …

Resultados de la cirugía videotoracoscópica en el neumotórax espontáneo primario analizando la técnica de pleurodesis por abrasión versus la técnica …

2013

Presentamos en este trabajo nuestra experiencia acumulada en el tratamiento quirúrgico del neumotórax espontáneo primario mediante cirugía videotoracoscópica. Se ha elegido el neumotórax por tratarse de la patología benigna que, además de frecuente, ha sido la primera en beneficiarse de la VATS. Durante un periodo de dieciséis años (entre junio de 1994 y febrero de 2010) se realizaron 238 intervenciones por neumotórax espontáneo primario mediante VATS en 216 pacientes; en 115 procedimientos se escogió la abrasión pleural como método de pleurodesis, mientras que en 123 casos se llevó a cabo una técnica mixta consistente en pleurectomía apical combinada con abrasión del resto de la pleura par…