Search results for "COPI"

Influence de la symétrie et de la taille de la molécule adsorbée sur le processus d'adsorption des composés éthyléniques sur une zéolithe de topologi…

2005

This manuscript lies within the scope of the understanding of the stepped isotherm observed during adsorption, on MFI zeolites, of some organic compounds which have a similar size to that of the pore opening of zeolite. During this work, the process of adsorption of ethylene and tetramethylethylene is initially studied by gravimetry and then by in situ infrared spectroscopy. This last technique enables to follow simultaneously the modifications of the adsorbent and the adsorbate. The analysis of these data lets suppose that the step in adsorption isotherm can be explained by taking account simultaneously of the symmetry and the size of the admolecule. In addition to the infrared bands chara…

DOSE RECOSTRUCTION IN IRRADIATED FOOD CONTAINING HYDROXIAPATITE USING ESR SPECTROMETRY

2012

Respiratory involvement in antineutrophil cytoplasmic antibody-associated vasculitides: a retrospective study based on POLVAS registry

2021

OBJECTIVES: The study aimed to characterise the Polish population of (ANCA)-associated vasculitides (AAV) with respiratory involvement (RI), in comparison to the subgroup without lung manifestations and the other cohorts. METHODS: Retrospective analysis of the Polish population of AAV with RI was conducted, based on data from the POLVAS registry. Standard descriptive statistics, χ2 test, and Mann-Whitney U test were used to perform comparisons. RESULTS: Among 461 cases qualified to this study, there were 316 cases with RI (68.5%), 206 with granulomatosis with polyangiitis (GPA) (65.2%), 80 with eosinophilic granulomatosis with polyangiitis (EGPA) (25.3%) and 30 with microscopic polyangiitis…

Search for high energy cosmic muon neutrinos from variable gamma-ray sources and time calibration of the optical modules of the ANTARES telescope

2015

325 páginas. Tesis Doctoral del Departamento de Física Atómica, Molecular y Nuclear de la Universidad de Valencia y del Instituto de Física Corpuscular (IFIC).

ANTITHROMBOTIC PROPHYLAXIS IN LAPAROSCOPIC CHOLECYSTECTOMY

2013

Pulmonary thromboembolism is a common cause of in-hospital death. In moderate or high risk patients undergoing laparotomy, acute and long-term mortality can be effec-tively reduced with an appropriate prophylactic drug treatment, while in low-risk patients undergoing laparoscopy, the correlation between the thromboembolism risk and the pro-cedure itself, as well as potential benefits of thromboprophylaxis are, at present, unclear. Here we report the case of E., a 49-year-old woman with patent foramen ovale, consid-ered to be at low risk of thromboembolism, who experienced a sudden cardiopulmonary arrest following a laparoscopic cholecystectomy and died four days later. . The purpose of this…

Small bowel obstruction after laparoscopic gastrectomy: An atypical clinical presentation. Report of a case

2020

Abstract Introduction Postoperative adhesions represent the most common cause of acute small bowel obstruction (80%) and are usually a consequence of abdomino-pelvic surgery performed with open technique. Presentation of case A 45-year-old black man arrived at the emergency room with abdominal pain and distension three months after laparoscopic distal gastrectomy with Roux-en-Y anastomosis performed for benign pyloric stenosis. CT abdominal scan revealed some air-fluid levels in the center of the abdomen with distension of proximal jejunal loops caused by intestinal adhesions. Laparoscopic adhesiolysis was performed to restore the intestinal transit. Discussion The formation of adhesions is…

Analysis of the morphology and composition of tooth apices apicectomized using three different ablation techniques.

2011

Objectives: To investigate apicectomies performed using burs, a CO2 laser or an Er:YAG laser and to evaluate the following aspects: morphology of apicectomized surfaces, presence of failures at the dentin/obturation material interface (marginal fit) of the apical portions of the root canals, and the proportions of chemical elements in the apicectomized surfaces. Study design: Twenty-four teeth were divided into three groups of eight and each group underwent apicectomy by one of three different ablation techniques: bur, CO2 laser or Er:YAG laser. The morphology of the apicectomized surfaces was then analyzed using scanning electron microscopy and their chemical composition was analyzed by en…

A new 3-d approach to determine functional morphology of cercopithecoid molars.

2005

Summary Functional relationships between diet and tooth morphology form an integral part of primatological and paleontological research. Previously, mostly two-dimensional parameters have been used to compare and interpret the complex crown morphology of cercopithecine and colobine molars. However, as teeth are three-dimensional objects, any dimensional reduction in describing their morphology must result in loss of information. In the current study we use a high resolution optical topometric system to record crown morphology in different wear stages in order to extract three-dimensional (3-d) parameters from virtual 3-d models. Structural parameters such as relief index, occlusal surface a…

Biexciton formation and exciton coherent coupling in layered GaSe.

2015

Nonlinear two-dimensional Fourier transform (2DFT) and linear absorption spectroscopy are used to study the electronic structure and optical properties of excitons in the layered semiconductor GaSe. At the 1s exciton resonance, two peaks are identified in the absorption spectra, which are assigned to splitting of the exciton ground state into the triplet and singlet states. 2DFT spectra acquired for co-linear polarization of the excitation pulses feature an additional peak originating from coherent energy transfer between the singlet and triplet. At cross-linear polarization of the excitation pulses, the 2DFT spectra expose a new peak likely originating from bound biexcitons. The polarizati…

X-shooter spectroscopy of young stars with disks. The TW Hydrae association as a probe of the final stages of disk accretion

2019

We investigate ongoing accretion activity in young stars in the TW Hydrae association (TWA, ~8-10 Myr), an ideal target to probe the final stages of disk accretion down to brown dwarf masses. Our sample comprises eleven TWA members with infrared excess, amounting to 85% of the total TWA population with disks, with spectral types between M0 and M9, and masses between 0.58 and 0.02 Msol. We employed homogeneous spectroscopic data from 300 to 2500 nm, obtained with X-shooter, to derive individual extinction, stellar parameters, and accretion parameters simultaneously. We then examined Balmer lines and forbidden emission lines to probe the physics of the star-disk interaction environment. We de…