Penetrating arrow in the face: a case report

Cases in which a foreign body is embedded in the maxillofacial region are uncommon and rarely reported. Our case is an unusual one of an arrow stuck in the face (in the naso-orbitoethmoid and maxillary region) during a fight resulting in severe pain and discomfort. To our knowledge, impaction with this type of foreign body has not been previously reported. The patient was successfully treated, using a multidisciplinary approach, with the patient assessed and treated by a variety of specialists.  Keywords: Maxillofacial trauma; retained foreign body; penetrating injury, Namibi

Gunshot injury to the face: a case report

Treatment of gunshot wounds in the maxillofacial region is complex. Current literature supports immediate treatment. Wounds vary widely. The nature of the injuries must be carefully assessed using the Kanzanjian and Converse’s principles of plastic surgery as guidance, but always adapting to specific needs. Management is dependent upon the type of weapon, the bullet’s characteristics, kinetic energy, place of impact, as well as the patient’s general health status. A case is presented of a gunshot injury to the face with a review of the literature

Synthesis and reactivity of half-sandwich (η 5 -C 5 Me 5 )Ir(iii) complexes of a cyclometallated aryl phosphine ligand

Reaction of the Ir(iii) dimer [(η 5 -C 5 Me 5 )IrCl 2 ] 2 with PMeXyl 2 (Xyl = 2,6-C 6 H 3 Me 2 ), in the presence of the poorly coordinating base 2,2,6,6-tetramethyl piperidine, gives a chloride complex 1-Cl, resulting from hydrogen chloride elimination involving one of the phosphine benzylic hydrogen atoms and concomitant cyclometallation. Related compounds containing other halide or pseudohalide ligands, 1-Br, 1-Cl, 1-SCN, can be made, the latter featuring S-coordination of the ambidentate thiocyanate to the soft Ir(iii) Lewis acid centre, as suggested by IR data and demonstrated by X-ray crystallography. Hydride 2-H, and alkyl derivatives 3 (Me) and 4 (CH 2 SiMe 3 ) can also be prepared from 1-Cl and appropriate hydride and alkylating reagents. An interesting H/D exchange chemistry that occurs in the presence of CD 3 OD has been disclosed for 1-Cl, 1-Br and 2-H. For the halide derivatives, deuterium incorporation takes place into the methylene and methyl sites of their cyclometallated ligand, whereas for 2-H only the hydride and methylene (Ir-CH 2 ) protons participate in the exchange, which is strikingly accelerated by catalytic amounts of acids.Ministerio de Ciencia e Innovación CTQ2010-17476Consolider-Ingenio2010 CSD2007-0000Junta de Andalucia FQM-119, P09-FQM-483

Non-heteroatom-substituted alkylidene complexes of groups 10 and 11

This review aims to offer a detailed summary of the discoveries regarding non-heteroatom-substituted alkylidenes of group 10 and 11 metals that have appeared in the literature since the first isolable representative of this class was reported in 2002. Special attention is focused on synthetic and bonding aspects of well-defined species. The importance of this family of compounds in catalytic organic transformations is often mentioned and a number of references are provided. We stress, however, that it is not the main issue of this review, as this topic has received considerable attention in the current literature.Ministerio de Economía, Industria y Competitividad CTQ2016-75193-

Synthesis and reactivity studies of cationic Ir(III) alkylidines. α-hydride abstraction reactions

The chemistry of late transition metal alkylidenes [M=CR2], where R is H a hydrocarbyl group, have attracted widespread attention although mainly with reference to complexes of metals in low oxidation state. We focus in this paper on reactions based on electrophilic attacks by Ph3C+ that allow either isolation of stable cationic Ir(III) alkylidenes, considerably more attractive than well-known Ir(I) counterparts, or the generation of very reactive variants that experience fast migratory insertion into existing Ir-C and Ir-H sigma bonds. The present studies are based on (η5-C5Me5)Ir(III) complexes that bear a cyclometalated PMeXyl2 ligand (Xyl = 2,6-Me2C6H3). The contribution of different monoanionic ligands (chloride, alkyl or hydride) to either stabilize the Ir=CR2 linkage or provide facile reactivity routes has been investigated, including the use of various deuterium isotopologues of the iridium complex precursors

Reactivity of a trans-[H-Mo≣Mo-H] Unit Towards Alkenes and Alkynes. Bimetallic Migratory Insertion, H-Elimination and Other Reactions

Complex [Mo2(H)2{μ-HC(NDipp)2}2(THF)2], (1·THF), reacts with C2H4 and PhCH[double bond, length as m-dash]CH2 to afford hydrido-hydrocarbyl and bis(hydrocarbyl) derivatives of the Mo[quadruple bond, length as m-dash]Mo bond. Reversible migratory insertion and β-hydrogen elimination, as well as reductive elimination and other reactions, have been uncovered. PhC[triple bond, length as m-dash]CH behaves instead as a Brönsted–Lowry acid towards the strongly basic Mo–H bonds of 1·THF.Ministerio de Economía y Competitividad CTQ2016-75193-PEuropean Research Council 75657

Electronic and structural effects of low-hapticity coordination of arene rings to transition metals

A DFT computational study and a structural analysis of the coordination of arenes to transition metals in low -hapticity (η1 and η2) modes have been developed, including a pseudosymmetry analysis of the molecular orbitals and the introduction of a hapticity map that makes evident the different degrees of intermediate hapticities. Calculations on [PtIIL3(C6H6)] model complexes reveal a preference for the η2 mode, while the η1 coordination is found to be a low-energy transition state for a haptotropic shift. The attachment of the arene to a side group that is coordinated to the metal introduces geometrical constraints, which result in hapticities intermediate between one and two. Comparison of the η1 arene complexes with benzonium cations shows that in the former case the bonding to the metal involves essentially the η system of the arene, affecting only slightly the delocalized nature of the carbon-carbon bonds. This behavior is in sharp contrast with the frequently found η1 coordination of Cp that involves σ bonding and full dearomatization of the ring.Peer reviewe

Development of an empirical model for chlorophyll-a and Secchi Disk Depth estimation for a Pampean shallow lake (Argentina)

Shallow Pampean lakes are located in the most productive plain of Argentina. They are highly variable in salinity, turbidity and surface area. Laguna Chascomús has been monitored as a representative example of them. We developed a linear model based on satellite images validated against field measurements (2001–2011 period). A vegetation index and Landsat Surface Reflectance (Band 4) produced the best correlations with chlorophyll-a (Chl-a) and Secchi Disk Depth (SDD), respectively. In a second instance, a retrospective analysis (1986–2013) was performed. As a result, significant positive trends were observed for SDD and Chl-a. In addition, both variables displayed trends related to rainfall and site depth.Fil: Bohn, Vanesa Yael. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca; Argentina. Universidad Nacional del Sur. Departamento de Geografía y Turismo; ArgentinaFil: Carmona, Facundo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional del Centro de la Provincia de Buenos Aires. Rectorado. Instituto de Hidrología de Llanuras - Sede Tandil. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto de Hidrología de Llanuras - Sede Tandil; ArgentinaFil: Rivas, Raúl Eduardo. Universidad Nacional del Centro de la Provincia de Buenos Aires. Rectorado. Instituto de Hidrología de Llanuras - Sede Tandil. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto de Hidrología de Llanuras - Sede Tandil; ArgentinaFil: Lagomarsino, Leonardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones Biotecnológicas. Instituto de Investigaciones Biotecnológicas "Dr. Raúl Alfonsín" (sede Chascomús). Universidad Nacional de San Martín. Instituto de Investigaciones Biotecnológicas. Instituto de Investigaciones Biotecnológicas "Dr. Raúl Alfonsín" (sede Chascomús); ArgentinaFil: Diovisalvi, Nadia Rosalia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones Biotecnológicas. Instituto de Investigaciones Biotecnológicas "Dr. Raúl Alfonsín" (sede Chascomús). Universidad Nacional de San Martín. Instituto de Investigaciones Biotecnológicas. Instituto de Investigaciones Biotecnológicas "Dr. Raúl Alfonsín" (sede Chascomús); ArgentinaFil: Zagarese, Horacio Ernesto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones Biotecnológicas. Instituto de Investigaciones Biotecnológicas "Dr. Raúl Alfonsín" (sede Chascomús). Universidad Nacional de San Martín. Instituto de Investigaciones Biotecnológicas. Instituto de Investigaciones Biotecnológicas "Dr. Raúl Alfonsín" (sede Chascomús); Argentin

Neurofibromatosis tipo I con manifestaciones en el maxilar superior.

ABSTRACT  OKIntroduction: Von Recklinghausen disease or neurofibromatosis type I (NF1) is an autosomal dominant disease with a wide clinical expression, with manifestations ranging from multiple café-au-lait spots to severe functional and aesthetic complications affecting bone tissue and nerve. Oral manifestations of NF1 are rare, affecting some patients.Case report: a case presenting neurofibromatous lesions in the upper alveolar ridge, maxillary tuberosity and part of the pterygomaxillary cavity, indicating surgical excision due to the difficulties presented when using dental prosthesis and the risk of trauma for this tumor during the mastication process. The relevance of this research lies in the fact that the disease rarely occurs in oral cavity. The size of the tumor, the surgical approach applied and the functional and aesthetic results obtained are shown, with no evidence of recurrence to date.Conclusions: a case of neurofibromatosis was presented, located in the alveolar ridge, maxillary tuberosity and pterygomaxillary cavity. Treatment made possible the functional and aesthetic rehabilitation of the patient.Introducción: la enfermedad de Von Recklinghausen o Neurofibromatosis Tipo I es una enfermedad autosómica dominante que presenta una variada expresión clínica, con manifestaciones que van desde manchas tipo café con leche en piel a severas complicaciones estéticas y funcionales afectando los tejidos óseos y nerviosos. Las manifestaciones orales de la Neurofibromatosis Tipo I son poco comunes, afectando algunos pacientes.Caso clínico: se presenta un caso de esta enfermedad con lesiones neurofibromatosas en el reborde alveolar superior, tuberosidad maxilar y parte de la fosa pterigomaxilar, con indicación de escisión quirúrgica debido a que el tamaño del tumor imposibilita la adaptación correcta de la prótesis dental que la paciente porta y además también favorece el traumatismo local que es un factor de riesgo importante para padecer de cáncer bucal.La relevancia de esta investigación consiste en lo poco común que se manifiesta esta enfermedad dentro de la cavidad bucal, la magnitud del tumor, el abordaje quirúrgico utilizado y los resultados funcionales y estéticos obtenidos sin evidencias de recidiva hasta la fecha.Conclusiones: se presentó un caso clínico de neurofibromatosis con localización en el reborde alveolar, tuberosidad maxilar y fosa pterigomaxilar. El tratamiento realizado permitió la rehabilitación funcional y estética del paciente