The remediation strategies for accumulated polyfluoroalkyl substances (PFAS) are a subject of great concern in environmental science. In this study, the thermal decomposition of trifluoroacetic acid ...(TFA) and trifluoroacetic anhydride (TFAN), taken as models of PFAS, were explored. Imaging photoelectron photoion coincidence (iPEPICO) spectroscopy was used to detect pyrolysis products from room temperature to 1000 °C under dilute conditions. The observed pyrolysis products of each molecule were CO, CO2, CF2, and CF2O (and CF3 for TFAN), with some species reflecting unimolecular rearrangement prior to dissociation. Electronic structure calculations using density functional theory and the SVECV‐F12 composite method were employed to evaluate the energy of the different decomposition channels. The results show the advantage of exploring the pyrolysis under dilute conditions to catch the first stages of unimolecular dissociation of these molecules for the first time.
Pyrolysis of PFAS models probed by photoelectron spectroscopy.
Intra-mandibular adenoid cystic carcinoma Bouaichi, A.; Aimad-Eddine, S.; Mommers, X.-A. ...
Revue de stomatologie, de chirurgie maxillo-faciale et de chirurgie orale,
April 2014, 2014-Apr, 2014-04-00, Letnik:
115, Številka:
2
Journal Article
Intra-mandibular localization of adenoid cystic carcinoma is rare. This tumor is characterized by progressive local, regional, and distant aggressiveness. We reviewed the latest data on this rare ...type of cancer with a small number of reported cases, alack of consensus for its treatment, and its bad prognosis.
Le carcinome adénoïde kystique est une tumeur maligne dont la localisation intra-mandibulaire est rare. Il se caractérise par une agressivité progressive locorégionale et à distance. Nous faisons une mise au point sur ce type de cancer rare, avec un nombre réduit de cas, l’absence de consensus pour son traitement et son mauvais pronostic.
The trichilemmal cyst, also called pilar cyst, is a dermal epithelial cyst originating from the pilar follicle. It usually occurs in the scalp. Hereditary and ossifying cases are rare.
We report the ...case of a 61-year-old woman presenting with familial multiple trichilemmal cysts, located in the scalp. The histological examination after surgical exeresis confirmed the diagnosis. The trichilemmal cysts featured intra-cystic ossification. The wide dimension of the lesions dimension imposed an extensive surgical scalp exeresis. Reconstruction was performed with a flap after skin expansion.
The trichilemmal cyst is a benign tumor of skin appendages with a slow outcome. Multiple locations may require an extensive surgical scalp exeresis and lead to a problematic reconstruction. Hereditary cases require familial follow-up to prevent such problems.
Tagging events with the coincident detection of a barium ion would greatly reduce the background for a neutrino-less double beta decay search in xenon. This paper describes progress towards realizing ...this goal. It outlines a source that can produce large quantities of Ba++ in gas, shows that this can be extracted to vacuum, and demonstrates a mechanism by which the Ba++ can be efficiently converted to Ba+ as required for laser identification.
Reconstruction of the anterior wall of the frontal sinus usually requires a coronal incision. This extended approach may lead to paresthesia, unsightly scars, bruises and cicatricial alopecia. These ...complications encouraged several authors to endoscopic management of this kind of fractures. We present a delayed technique of reconstruction of the anterior wall of the frontal sinus by means of endoscopic hydroxyapatite filling.
Two incisions were performed behind the hair line. Subperiosteal dissection using a periosteal elevator was performed. A 30° angled endoscope was used to visualize the depression. The latter was filled by Hydroset® (Stryker, USA) as a bone substitute.
In the absence of contra-indication, the reconstruction of the anterior wall of the frontal sinus by means of endoscopic hydroxyapatite filling has many advantages including uneventful outcome, reduction of the hospital stay and a fast learning curve.
Temporomandibular joint (TMJ) disorders are usually managed medically. But partial or total reconstruction may be indicated according to the severity and the functional impairment. We assessed the ...functional results after total TMJ reconstruction using the Biomet Microfixation® prosthesis (Jacksonville, FL, USA).
We reviewed the files of patients having undergone reconstruction, between 2009 and 2010, with a total TMJ prosthesis. We analyzed the pre- and postoperative mouth opening, the pre- and postoperative occlusion, pre- and postoperative pain according to a simple spoken scale ranging from 0 (no pain) to 4 (severe pain).
Twelve total TMJ prostheses were placed in five women and three men (mean age 49.2 years). Restriction of mouth opening was the first cause of consultation. The etiology was trauma for four patients. Three patients had preoperative malocclusion. Four patients had bilateral reconstruction. Preoperative pain ranged between 2 and 4. The average initial mouth opening was 17.8mm. There was neither infection nor any major complication. No prosthesis was removed. The mean follow-up was 18.5 months. At the end of the study, pain ranged between 0 and 2. All patients with preoperative malocclusion resumed an Angle class I postoperatively. The average postoperative mouth opening was 39.5mm.
Total TMJ reconstruction with the Biomet Microfixation® prosthesis improves mouth opening and reduces pain.
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