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52. ASSEMBLY OF A SUCCINYL-CALIX[4]ARENE DERIVATIVE IN MULTILAMELLAR VESICLES

Author

Granata G., Consoli G. M. L., Geraci C., Lo Nigro R., and Malandrino G.

Subjects
amphiphilic calixarene, nanoaggregates, multilamellar vesicle, guest entrapment
Abstract

Self-assembled structures built from amphiphilic molecules find application in different fields. a The synthetic versatility of calixarene macrocycles, whose skeleton can be differently functionalized with a variety of hydrophilic and hydrophobic moieties, allows the development of amphiphilic derivatives able to aggregate in different higher order supramolecular architectures. b, c Here we describe the capability of an amphiphilic calix[4]arene derivative, bearing four carboxylic acid groups at the calixarene upper rim and four dodecyl chains at the lower rim, to form discrete and stable multilamellar vesicles in aqueous medium by using an emulsion/solvent evaporation method. Dynamic Light Scattering (DLS) measurements, Field Emission Scanning Electron Microscopy (FE-SEM) and Transmission Electron Microscopy (TEM) images provided information about size, size distribution and morphology of the nanostructured assemblies. The vesicular nature was confirmed by entrapment of a hydrophilic dye such as rodhamine B in aqueous lumen. A preliminary study showed that the self-assembled structures of the carboxy-calix[4]arene can entrap also a hydrophobic drug such as curcumin. The amphiphilic carboxy-calix[4]arene represents the first example of calix[4]arene derivative assembling in very stable multilamellar vesicles in aqueous medium with a narrow polydispersity. Suitable nanometer-size, very size narrow distribution, well-defined spherical shape, negatively charged hydrophilic multilamellar wall, high size stability (more than two years), and guest encapsulation ability make the vesicles of the carboxy-calix[4]arene derivative appealing in the research of drug delivery systems. Acknowledgment: Research funded by PON R&C 02_00355_2964193 (MIUR, Rome). References: a) Hill, J. P.; Shrestha, L. K.; Ishihara, S.; Ji, Q.; Ariga, K. Molecules 2014, 19, 8589-8609. b) Helttunen, K.; Shahgaldian, P. New J. Chem. 2010, 34, 2704-2714. c) Consoli, G. M. L.; Granata, G.; Lo Nigro, R.; Malandrino, G.; Geraci, C. Langmuir 2008, 24, 6194-6200.

Published
2015

54. Surgical wound infection by mannitol-nonfermenting Staphylococcus aureus after lumbar microdiscectomy

Author

Savini, V., Nigro, R., Roberta Marrollo, Polilli, E., Campitelli, I., Buonaguidi, R., Fazii, P., and Carretto, E.

Subjects
Adult, DNA, Bacterial, Male, Microsurgery, Staphylococcus aureus, Lumbar Vertebrae, Case Report, Microbial Sensitivity Tests, Staphylococcal Infections, DNA Fingerprinting, Polymerase Chain Reaction, Anti-Bacterial Agents, Treatment Outcome, Predictive Value of Tests, Fermentation, Humans, Surgical Wound Infection, Mannitol, Diskectomy
Abstract

Purulent infection of a surgical wound developed after discectomy, and a mannitol-nonfermenting Staphylococcus aureus isolate was cultivated as the etiologic agent. Nonfermenting S. aureus strains are exceedingly rare and may be erroneously mistaken and dismissed as contaminants. This report then emphasizes that pure and massive cultures must be carefully evaluated, even if preliminary examination does not suggest a pathogenic organism. Also, although mannitol-negative, the studied strain was correctly detected as S. aureus by both the-FISH test (AdvanDx, USA) and the Liofilchem 'Chromatic Staph aureus', highlighting that additional diagnostic methods may support recognition of uncommon, nonfermenting S. aureus strains in the daily practice.

Published
2014

61. Small beam dosimetry: A multi-center multi-detector italian project

Author

Talamonti, C., primary, Russo, S., additional, Barone, Tonghi L., additional, Benecchi, G., additional, Borzi, G., additional, Bresciani, S., additional, Cagni, E, additional, Carbonino, C., additional, Casale, M., additional, Clemente, S., additional, Consorti, R., additional, D’Alessio, V., additional, Dicastro, E., additional, Donofrio, G., additional, Falco, M.D., additional, Fedele, D., additional, Fiandra, C., additional, Frassanito, C., additional, Gasperi, C., additional, Giglioli, F.R., additional, Iervolino, C., additional, Infusino, E., additional, Linsalata, S., additional, Loi, G., additional, Lorenzini, E., additional, Marino, C., additional, Martinotti, S., additional, Masi, L., additional, Menghi, E., additional, Miceli, R., additional, Moretti, E., additional, Nardiello, B., additional, Nigro, R., additional, Pastore, G., additional, Pressello, M.C., additional, Pimpinella, M., additional, Raza, G., additional, Rosica, F., additional, Ruggeri, R., additional, Spiazzi, L., additional, Stasi, M., additional, Strigari, L., additional, Tremolada, V., additional, Vaiano, A., additional, Vigorito, S., additional, Villaggi, E., additional, Vittorini, F., additional, and Mancosu, P., additional

Published
2016
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62. Dosimetric characterization of linac small beams using a plastic scintillator detector: A multicenter study

Author

Pasquino, M., primary, Stasi, M., additional, Mancosu, P., additional, Russo, S., additional, Villaggi, E., additional, Gasperi, C., additional, Casale, M,., additional, Loi, G., additional, Strigari, L., additional, Miceli, R., additional, Raza, G.H., additional, Fedele, D., additional, Vaiano, A., additional, Falco, M.D., additional, Moretti, E., additional, Giglioli, F.R., additional, Nigro, R., additional, Talamonti, C., additional, Pastore, G., additional, Luxardo, S., additional, Menghi, E., additional, Benecchi, G., additional, Clemente, S., additional, Marino, C., additional, Borzi, G., additional, Nardiello, B., additional, Ardu, V., additional, Paladini, L., additional, Cagni, E., additional, Russo, G., additional, Spiazzi, L., additional, and Vittorini, F., additional

Published
2016
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64. PO-0818: Multicentre small field measurements using a new plastic scintillator detector

Author

Pasquino, M., primary, Russo, S., additional, Mancosu, P., additional, Villaggi, E., additional, Loi, G., additional, Miceli, R., additional, Raza, G.H., additional, Vaiano, A., additional, Falco, M.D., additional, Moretti, E., additional, Giglioli, F.R., additional, Nigro, R., additional, Talamonti, C., additional, Pastore, G., additional, Menghi, E., additional, Palleri, F., additional, Clemente, S., additional, Marino, C., additional, Borzì, G., additional, Ardu, V., additional, Linsalata, S., additional, Mameli, A., additional, D'Alesio, V., additional, Vittorini, F., additional, and Stasi, M., additional

Published
2016
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65. Multicentre results of EPID-based in-vivo dosimetry

Author

Piermattei, A., primary, Menna, S., additional, Greco, F., additional, Cilla, S., additional, Caivano, R., additional, Fusco, V., additional, Orlandini, L., additional, Benecchi, G., additional, Nigro, R., additional, Falco, D., additional, and Fidanzio, A., additional

Published
2016
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69. Multicenter evaluation of the dosimetric characterization of linac small beams using a plastic scintillator detector

Author

Mancosu, P., primary, Ardu, V., additional, Benecchi, G., additional, Gasperri, C., additional, Linsalata, S., additional, Loi, G., additional, Menghi, E., additional, Mones, E., additional, Nigro, R., additional, Palleri, F., additional, Pasquino, M., additional, Pellegrini, C., additional, Riccardi, S., additional, Spiazzi, L., additional, and Stasi, M., additional

Published
2016
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80. Praseodymium based dielectrics: Metal-Organic Chemical Vapor Deposition (MOCVD) growth, characterization and applications

Author

LO NIGRO, R., Malandrino, Graziella, Toro, R. G., Fiorenza, P., and Raineri, V.

Abstract

Rare earth oxide thin films are of interest for several purposes including optical coatings, catalytic agents and/or supports, protective coatings, etc. Among the rare earth oxides, praseodymium oxides have been studied for many applications, such as component of varistor ceramic materials, photocatalytically active materials, and anode for organic light-emitting diodes and as dielectrics for microelectronic applications. The most interesting and studied praseodymium dielectrics include: h-Pr2O3, praseodymium silicates and praseodymium aluminates. In the following, a description of the different MOCVD approaches to fabricate praseodymium oxides, silicates and aluminates films with dielectric properties is presented. The MOCVD technique is a well-established, versatile and widely used method for producing technologically important thin films, ranging from metals to semiconductors, insulators and superconductors, with tailored properties. MOCVD compared to other deposition techniques offers the advantage of a great process simplicity, cheapness and conformal coverage achievable over complex three-dimensional topologies, and amenability to very large-scale depositions with low-cost apparatus. Thus the MOCVD processes to growth pure Pr-containing materials are discussed ranging from the precursors to the deposition parameters. Moreover, a detailed characterization of the final structure of the deposited films is supplied since it is mandatory in order to achieve a fundamental understanding for the electronic and chemical properties of the obtained materials in the perspective of their applications in microelectronics devices.

Published
2011

82. Scanning Probe Microscopy on heterogeneous CaCu(3)Ti(4)O(12) thin films

Author

Fiorenza P, Lo Nigro R, and Raineri V

Abstract

The conductive atomic force microscopy provided a local characterization of the dielectric heterogeneities in CaCu(3)Ti(4)O(12) (CCTO) thin films deposited by MOCVD on IrO(2) bottom electrode. In particular, both techniques have been employed to clarify the role of the inter- and sub-granular features in terms of conductive and insulating regions. The microstructure and the dielectric properties of CCTO thin films have been studied and the evidence of internal barriers in CCTO thin films has been provided. The role of internal barriers and the possible explanation for the extrinsic origin of the giant dielectric response in CCTO has been evaluated.

Published
2011

83. CaCu(3)Ti(4)O(12) single crystals: insights on growth and nanoscopic investigation

Author

Fiorenza P, Raineri V, Ebbinghaus SG, and Lo Nigro R

Abstract

The combination of scanning impedance microscopy and conductive atomic force microscopy was applied to single crystals of the perovskite-type oxide CaCu(3)Ti(4)O(12) (CCTO) in order to provide a local dielectric characterization on ingot sections. Both techniques clearly showed dielectric heterogeneities due to the presence of inclusions within crystals grown in different laboratories. Despite macroscopic characterizations, such as Laue diffraction, gave no indications for the presence of inclusions within the crystals, the discovery of dielectric heterogeneities prompted a careful structural analysis, which revealed the presence of crystalline CaTiO(3) (CTO) precipitates. Thus, the scanning probe investigation provided the evidence for the electrical homogeneity within the CCTO crystal and the presence of internal barriers due to the CCTO/CTO interfaces.

Published
2011

86. EP-1471: Lung SABR: radiobiological multi planning comparison in a perspective of a multi-institutional study

Author

Giglioli, F.R., primary, Ragona, R., additional, Fiandra, C., additional, Pastore, G., additional, Landoni, V., additional, Borzì, G., additional, Menghi, E., additional, Villaggi, E., additional, Carbonini, C., additional, Zani, M., additional, Lorenzini, E., additional, Malisan, M., additional, Redaelli, I., additional, Loi, G., additional, Ravaglia, V., additional, Fedele, D., additional, Nigro, R., additional, Nardiello, B., additional, Frassanito, C., additional, Falco, M.D., additional, Cagni, E., additional, Ruggieri, R., additional, Consorti, R., additional, El Gawhary, R., additional, and Mancosu, P., additional

Published
2015
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87. PO-0984: Treatment plan intercomparison for SBRT in a national context: final results from 53 centers

Author

Carbonini, C., primary, Barone, L., additional, Bonanno, E., additional, Borzi, G., additional, Brogna, A., additional, Cagni, E., additional, Clemente, S., additional, Consorti, R., additional, D'Alesio, V., additional, Esposito, M., additional, Fedele, D., additional, Fiandra, C., additional, Giglioli, F., additional, Linsalata, S., additional, Maggi, G., additional, Malatesta, T., additional, Malisan, M.R., additional, Mameli, A., additional, Marino, C., additional, Martinotti, A., additional, Nardiello, B., additional, Nigro, R., additional, Strigari, L., additional, Villaggi, E., additional, and Mancosu, P., additional

Published
2015
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