Spontaneus pneumomediastinum associated with exacerbation of asthma during the epidemic of influenza A H1N1: Report of four cases [Neumomediastino espontáneo asociado a exacerbación del asma durante la epidemia de influenza A H1N1; informe de cuatro casos]

Abstract

We have performed both semiempirical as well as ab initio density functional theory calculations in order to investigate the structural stability of highly hydroxylated C60(OH)32 fullerenes, so-called fullerenols. Interestingly, we have found that low-energy atomic configurations are obtained when the OH groups are covering the C60 in the form of small hydroxyl islands. The previous formation of OH molecular domains on the carbon surface, stabilized by hydrogen bonds between neighboring OH groups, defines the existence of C60(OH)32 fullerene structures with some elongated C - C bonds, closed electronic shells, and large highest occupied-lowest unoccupied molecular orbital energy gaps, with the latter two being well-known indicators of high chemical stability in these kind of carbon compounds. The calculated optical absorption spectra show that the location of the first single dipole-allowed excitation strongly depends on the precise distribution of the OH groups on the surface, a result that, combined with optical spectroscopy experiments, might provide an efficient way to identify the structure of these kinds of fullerene derivatives. We found that the presence of a few coadsorbed oxygen species on the fullerene surface leads in general to the existence of C60(OH)32Ox (x = 1-4) compounds in which some of the C - C bonds just below the O impurities are replaced by C-O-C bridge bonds, leading to the formation of stable carbon-opened structures in agreement with the recent experimental work of Xing et al. (J. Phys. Chem. B 2004, 108, 11473). Actually, a more dramatic cage destruction is obtained when considering multiply charged C 60(OH)32Ox mm (m = 2, 4, 6) species (that can exist in both gas-phase and aqueous environments), where now sizable holes made of 9- and 10-membered rings can exist in the carbon network. We believe That our results are important if the controlled opening of carbon cages is needed and it should be taken into account also in several technological applications where the permanent encapsulation of atomic or molecular species in these types of fullerene derivatives is required. " 2006 American Chemical Society.",,,,,,"10.1021/jp061855m",,,"http://hdl.handle.net/20.500.12104/44708","http://www.scopus.com/inward/record.url?eid=2-s2.0-33748325790&partnerID=40&md5=4067a26ec5556e5628a115f286864a83

http://ovidsp.ovid.com/ovidweb.cgi?T=JS&CSC=Y&NEWS=N&PAGE=fulltext&D=prem&AN=16869697

http://dx.doi.org/10.1021/jp061855m",,,,,,"30",,"Journal of Physical Chemistry A",,"9459

9468",,"110",,"Scopus

MEDLINE

ChemAbsS

WOS",,,,,,,,,,,,"Stability of highly OH-covered C60 fullerenes: Role of coadsorbed O impurities and of the charge state of the cage in the formation of carbon-opened structures",,"Article" "46430","123456789/35008",,"Guzmán-Dávalos, L., Instituto de Botánica, Universidad de Guadalajara, Apdo. postal 1-139, Zapopan, Jal. 45110, Mexico; Ovrebo, C.L., Department of Biology, University of Central Oklahoma, Edmond, OK, United States",,"Guzman-Davalos, L.

Ovrebo, C.L.",,"2001",,"Three species of Gymnopilus are recorded for the first time from Central America. Gymnopilus crassitunicatus, collected in a Quercus forest in Costa Rica, is described as new. It differs from other species of the genus by its strongly verrucose spores with warts embedded in a perisporium, thick-walled pleurocystidia and caulocystidia, and hyphae from hymenophoral trama with pigment-encrusted walls. Gymnopilus robustus and G. rugulosus were described from Mexico. The former is now reported from Costa Rica and Panama, and the latter from Costa Rica. It is probable that both species are very common in tropical and subtropical Central America.",,,,,,,,,"http://hdl.handle.net/20.500.12104/44651","http://www.scopus.com/inward/record.url?eid=2-s2.0-0035280783&partnerID=40&md5=c9fe3c9555f825a085bc6e293e59f326",,,,,,"2",,"Mycologia",,"398

404",,"93",,"Scopus

WOS",,,,,,"Agaricales; Annulati; Central America; Cortinariaceae",,,,,,"Some species of Gymnopilus from Costa Rica and Panama",,"Article" "46479","123456789/35008",,"Bedolla-Barajas, M., Servicio de Alergia e Inmunologia Clinica, Hospital Civil de Guadalajara Dr. Juan I. Menchaca, Universidad de Guadalajara, Guadalajara, Jalisco, Mexico; Hernández-Colón, D.D., Servicio de Alergia e Inmunologia Clinica, Hospital Civil de Guadalajara Dr. Juan I. Menchaca, Universidad de Guadalajara, Guadalajara, Jalisco, Mexico; Miramontes-Luna, E., Division de Medicina Interna, Hospital Civil de Guadalajara Dr. Juan I. Menchaca, Universidad de Guadalajara, Guadalajara, Jalisco, Mexico; Aguilar-Arreola, J.E., Division de Medicina Interna, Hospital Civil de Guadalajara Dr. Juan I. Menchaca, Universidad de Guadalajara, Guadalajara, Jalisco, Mexico; Bernal-López, C., Division de Medicina Interna, Hospital Civil de Guadalajara Dr. Juan I. Menchaca, Universidad de Guadalajara, Guadalajara, Jalisco, Mexico; Robles-Figueroa, M., Division de Medicina Interna, Hospital Civil de Guadalajara Dr. Juan I. Menchaca, Universidad de Guadalajara, Guadalajara, Jalisco, Mexico",,"Bedolla-Barajas, M.

Hernandez-Colin, D.D.

Miramontes-Luna, E.

Aguilar-Arreola, J.E.

Bernal-Lopez, C.

Robles-Figueroa, M.",,"2011",,"Spontaneus pneumomediastinum (SP) is an infrequent but usually benign pathology. Its main clinical manifestations are thoracic pain, dyspnea and subcutaneous emphysema. We describe the clinical findings of 4 SP patients, identified in the context of an A H1N1 influenza virus epidemic. All the patients were young and all of them required initial medical attention for asthma exacerbation. The most frequent symptoms and signs to detect SP were cervical pain and subcutaneous emphysema; chest radiography helped to confirm the diagnosis. Concomitant A H1N1 influenza virus infection was documented in two patients. The treatment was focused in the basic pathology; two patients were placed on oseltamivir, whereas the two others just had expectant management. " 2011 Colegio Mexicano de Inmunología Clínica y Alergia, AC y de la Sociedad Latinoamericana de Alergia, Asma e Inmunología.