Search results for "Opening"

Una storia italiana: Giorgio e Isabella

2018

Si tratta, qui, della storia di due italiani dalla “pelle scura” raccontata, per Giorgio Marincola, da Carlo Costa e Lorenzo Teodonio in Razza partigiana e, per la sorella Isabella, da Wu Ming 2 e Antar Mohamed in Timira. Romanzo meticcio. Le loro vicende, così come molti altri aspetti della nostra storia coloniale, neocoloniale e postcoloniale, sono riemerse dal buio nel quale erano state occultate solo nell’ultimo quindicennio, grazie alla riapertura degli archivi che ha permesso di ridiscutere molti degli aspetti che nelle pagine di Storia, così come in quelle letterarie, erano stati raccontati in altro modo. I due testi, che hanno inevitabilmente finito per incontrarsi e che potremmo in…

Synthetic and theoretical studies of novel ring closure and ring opening reactions

2006

Ring closure and ring opening reactions are in many cases useful synthetic procedures in organic chemistry. They allow the preparation of complex molecules with high stereoselectivity and good yields. Mechanistic and theoretical studies have been carried out on the transformation of 2-aminopyrimidines into imidazo[1,2-c]pyrimidines and guanidines, respectively, through ring closure and ring opening reactions, as well as the transamidation reactions through the ring closure and ring opening of guanidine derivatives, which constitute novel synthetic methods. Sepulveda Arques, Jose, Jose.Sepulveda@uv.es

Low-temperature molecular layer deposition using monifunctional aromatic precursors and ozone-based ring-opening reactions

2017

Molecular layer deposition (MLD) is an increasingly used deposition technique for producing thin coatings consisting of purely organic or hybrid inorganic-organic materials. When organic materials are prepared, low deposition temperatures are often required to avoid decomposition, thus causing problems with low vapor pressure precursors. Monofunctional compounds have higher vapor pressures than traditional bi- or trifunctional MLD precursors, but do not offer the required functional groups for continuing the MLD growth in subsequent deposition cycles. In this study, we have used high vapor pressure monofunctional aromatic precursors in combination with ozone-triggered ring-opening reactions…

Modelling of microcracked bodies using the concept of crack opening mode

2010

Esteve Graset. Una dramaturgia interdisciplinaria. Materiales del discurso escénico en Esteve Graset

2016

Esteve Graset es uno de los artistas españoles más desconocidos y a la vez interesantes de la escena nacional e internacional de las últimas décadas. Es autor de textos, instalaciones escénicas, importantes trabajos sobre la voz humana (conciertos) y muchas producciones escénicas con actores y bailarines en las que se pone en práctica la suma de todos sus conocimientos e inquietudes. Con los materiales de sus propias representaciones organiza instalaciones en las que da vida a los objetos. Su personalidad independiente y evolutiva, su discurso como actor, director, autor, creador y pedagogo, así como la gran variedad de disciplinas artísticas que contempla su obra, y su compromiso con el ti…

Dental management of patients with microstomia. A review of the literature and update on the treatment.

2015

Difficulty in dental management is one of the factors that characterize the patient that requires special care in dentistry. One of the clinical conditions that make dental treatment particularly complex is microstomia.Microstomia is defined as a small and insufficient oral aperture that will hinder diagnosis and dental treatment. Although there have been reports of patients with diseases and syndromes that cause microstomia, the available literature offers only a limited number of reviews on this topic. The aim of this paper is to present a review of the etiology, clinical characteristics, diagnosis and treatment of microstomia. In addition, to describe the therapeutic adaptations to be ap…

Wache Videolaryngoskopie

2016

Introduction Awake video laryngoscopy is a novel option in airway management that is drawing more and more attention as an alternative to awake endoscopic guided intubation.Main issues: Intubation under preserved spontaneous breathing is the safest method to secure the expected difficult airway. In direct comparisons to awake flexible endoscopic intubation, awake video laryngoscopy achieves satisfactory intubation times and a high acceptance of patients and anesthesiologists. Specific cases, in particular very limited mouth opening or sub-glottic masses, require awake flexible endoscopic intubation. Sufficient topical anesthesia and a sophisticated sedation protocol are prerequisites for su…

Well-Defined Multi-Amino-Functional and Stimuli-Responsive Poly(propylene oxide) by Crown Ether Assisted Anionic Ring-Opening Polymerization

2017

Multi-amino-functional poly(propylene oxide) (PPO) copolymers were synthesized by the anionic ring-opening copolymerization (AROP) of N,N-diethyl glycidyl amine (DEGA) and propylene oxide (PO). A solvent free synthesis route using potassium counterions and crown ether for the AROP enabled controlled (co)polymerization with full conversion. The strategy provided access to PPO-b-PDEGA block copolymers, statistical PPO-co-PDEGA copolymers, and, for the first time, PDEGA homopolymer. Molecular weights in the range of 1400 to 4200 g/mol (Mn) and dispersities (Mw/Mn) below 1.1 were obtained. Both the kinetics and resulting microstructure of the statistical copolymerization were investigated by in…

Synthesis of poly(disulfide)s with narrow molecular weight distributions via lactone ring-opening polymerization

2020

We report the first example of controlled polymerization of poly(disulfide)s with narrow molecular weight distributions. 1,4,5-oxadithiepan-2-one (OTP), a disulfide-containing 7-membered ring lactone, was polymerized by using the diphenylphosphate (DPP) catalyzed lactone ring-opening polymerization method. The polymerization proceeded in a living manner, and the resulting polymers displayed very narrow polydispersity index (PDI) values below 1.1 and excellent backbone degradability responding to reducing conditions and UV irradiation.

Long-chain branched ROMP polymers

2009

This article describes the construction of branched ROMP-polymer architectures via polycondensation of ABn-type macromonomers. For this convergent strategy, a polymer was synthesized that carries several hydroxyl-groups along the polymer chain and one carboxylic acid group at the chain end. An esterification reaction between these functional groups yielded long-chain branched polymers. The polymers were analyzed by NMR and SEC to monitor the condensation reaction. © 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2009