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218 results on '"D'Antò V"'

1. Electrostatic steepening of whistler waves

Author

Vasko, Ivan Y., Agapitov, Oleksiy V., Mozer, Forrest S., Bonnell, John W., Artemyev, Anto V., Krasnoselskikh, Vladimir V., and Tong, Yuguang

Subjects
Physics - Space Physics
Abstract

We present surprising observations by the NASA Van Allen Probes spacecraft of whistler waves with substantial electric field power at harmonics of the whistler wave fundamental frequency. The wave power at harmonics is due to nonlinearly steepened whistler electrostatic field that becomes possible in the two-temperature electron plasma due to whistler wave coupling to the electron-acoustic mode. The simulation and analytical estimates show that the steepening takes a few tens of milliseconds. The hydrodynamic energy cascade to higher frequencies facilitates efficient energy transfer from cyclotron resonant electrons, driving the whistler waves, to lower energy electrons.

Published
2018
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4. Correlation between cephalometric variables and obstructive sleep apnoea severity in children

Author

Galeotti A, Festa P, Viarani V, Pavone M, Sitzia E, Piga S, Cutrera R, De Vincentiis GC, D'Antò V., Galeotti, A, Festa, P, Viarani, V, Pavone, M, Sitzia, E, Piga, S, Cutrera, R, De Vincentiis, Gc, and D'Antò, V.

Subjects
Sleep Apnea, Obstructive, Cephalometry, Polysomnography, Cephalometric analysi, Upper airways space, Humans, Pharynx, Mandible, Child, Children, Obstructive sleep apnea
Abstract

Aim Alterations in craniofacial growth have been associated with obstructive sleep apnoea in children. The main objectives of this study were to analyse the correlation between cephalometric variables and Obstructive Apnea/Hypopnea Index (OAHI) in order to investigate if craniofacial features may influence the severity of obstructive sleep apnoea and to study the correlation between upper nasopharyngeal width and maxillomandibular skeletal discrepancy in sagittal and vertical plane. Materials and methods Study Design: Correlations between cephalometric variables and obstructive sleep apnoea/hypopnea index and between upper airways space and maxillomandibular skeletal discrepancy were investigated. Forty-seven children with obstructive sleep apnoea diagnosed by overnight sleep study (polysomnography) underwent a lateral radiograph, orthodontic and ear-nose-throat examinations. Cephalometric analysis according to Kirjavainen has been performed to define skeletal and upper airways variables. Statistics: Spearman’s correlation analysis was performed between OAHI and all cephalometric variables. Pearson’s correlation analysis was performed between cephalometric variables of upper airway space and cephalometric variables related to maxillomandibular discrepancy. Chi-square test was used to compare occlusal features with adenoidal and tonsillar hypertrophy. Kruskal-Wallis rank test was used to compare OAHI with occlusal variables and adenotonsillar hypertrophy. Results The results show a positive correlation between OAHI and maxillomandibular discrepancy measured by ANB angle (rho=0.32; p=0.023). A significant correlation was found between upper nasopharyngeal width and vertical maxillomandibular skeletal discrepancy: 1) ad1-PNS were correlated to Mandibular Plane/SellaNasion angle (r=-0.36; p=0.012), Palatal Plane/Mandibular Plane angle (r=-0.39; p=0.007), and Posterior-Anterior Facial Height % (r=0.29; p=0.045); 2) ad2-PNS was correlated to Palatal Plane/Mandibular Plane angle (r=-0.39; p=0.007). No statistically significant differences were found in non-parametric tests between OAHI and occlusal variables or adenoidal and tonsillar hypertrophy. Conclusions The present study shows a significant correlation between maxillomandibular discrepancy and the severity of OSA. Moreover, the reduction of nasopharyngeal width was correlated to maxillomandibular hyperdivergent growth pattern. These results support the presence of a correlation between sleep-disordered breathing and craniofacial features even if the cause-effect relation is still unclear. Based on these evidences, we suggest the importance of orthodontic evaluation in the management of paediatric OSA.

Published
2019

11. Behaviour of human mesenchymal stem cells on chemically synthesized HA-PCL scaffolds for hard tissue regeneration

Author

D'Antò, V, Raucci, M. G., Guarino, V, Martina, S, Valletta, R, Ambrosio, L, D'Antò, V, Raucci, Mg, Guarino, V, Martina, S, Valletta, Rosa, and Ambrosio, L.

Abstract

Our goal was to characterize the response of human mesenchymal stem cells (hMSCs) to a novel composite scaffold for bone tissue engineering. The hydroxyapatite-polycaprolactone (HA-PCL) composite scaffolds were prepared by a sol-gel method at room temperature and the scaffold morphology was investigated by scanning electron microscopy (SEM)/energy-dispersive spectroscopy (EDS) to validate the synthesis process. The response of two different lines of hMSCs, bone-marrow-derived human mesenchymal stem cells (BMSCs) and dental pulp stem cells (DPSCs) in terms of cell proliferation and differentiation into the osteoblastic phenotype, was evaluated using Alamar blue assay, SEM, histology and alkaline phosphatase activity. Our results indicate that tissue engineering by means of composite HA-PCL scaffolds may represent a new therapeutic strategy to repair craniofacial bone defects.

Published
2016

13. NF-kB activation counteracts apoptotic signalling induced by HEMA

Author

SPAGNUOLO, GIANRICO, RENGO, SANDRO, Mauro C., Santillo M. R., D'Antò V., Schweikl H., Spagnuolo, Gianrico, Mauro, C, Santillo, Mr, D’Antò, V, Schweikl, H, Rengo, Sandro, Mauro, C., Santillo, M. R., D'Antò, V., and Schweikl, H.

Published
2004

18. NiCl2 Alters Cytokine Secretion of RAW 264.7 Macrophages

Author

D’Antò V, Hiller K. A, Valletta R, Martina R, Schmalz G, Schweikl H, Ambrosio L., SPAGNUOLO, GIANRICO, D’Antò, V, Spagnuolo, Gianrico, Hiller K., A, Valletta, R, Martina, R, Schmalz, G, Schweikl, H, and Ambrosio, L.

Published
2010

20. Effect of mineral trioxide aggregate on mesenchymal stem cells

Author

D'Antò V, Di Caprio MP, Ametrano G, SIMEONE, MICHELE, RENGO, SANDRO, SPAGNUOLO, GIANRICO, D'Antò, V, Di Caprio, Mp, Ametrano, G, Simeone, Michele, Rengo, Sandro, and Spagnuolo, Gianrico

Abstract

INTRODUCTION: Mineral trioxide aggregate (MTA) is known to stimulate the hard tissue repair process. The purpose of this study was to evaluate the ability of MTA to support the adhesion, proliferation, and migration of human bone marrow-derived mesenchymal stem cells (hMSCs). METHODS: White ProRoot MTA and white Portland cement were mixed and left to set 24 hours. MSCs were cultured on the samples and observed after 24 hours by confocal laser scanning microscopy (CLSM) by using the cytoskeleton marker CellTracker. Cell proliferation was evaluated by means of alamar blue assay in the presence and absence of differentiation medium during a period of 28 days, and cells seeded on polystyrene culture wells were the control. To assess the effect on migratory ability of hMSCs, a transwell migration assay was performed for 18 hours, positioning MTA and Portland cement in 6-well plates and the cells in 8-μm pore inserts. RESULTS: hMSCs observed under CLSM showed attachment and spread activity on the upper surface of the MTA. Cell proliferation was significantly higher on MTA than on Portland cement. A rate proliferation increase of the MTA group compared with the control was observed after 14 days in presence of basic medium, whereas the same effect was reached after 21 days in presence of differentiation medium. Moreover, MTA was able to enhance cell migration significantly more than Portland cement. CONCLUSIONS: Our findings suggest that MTA was able to assist hMSC adhesion, growth, and migration.

Published
2010

22. Effect of mineral trioxide aggregate on mensenchymal stemm cells

Author

Di Caprio M.P., D’Antò V., Ametrano G., Ambrosio L., SPAGNUOLO, GIANRICO, SIMEONE, MICHELE, RENGO, SANDRO, Di Caprio, M. P., D’Antò, V., Spagnuolo, Gianrico, Ametrano, G., Simeone, Michele, Ambrosio, L., and Rengo, Sandro

Published
2009

23. Sol-gel materials for hard tissue engineering

Author

D'Antò V., De Santis R., Catauro M., Gloria A., Valletta R., Martina R., RENGO, SANDRO, D'Antò, V., De Santis, R., Catauro, M., Gloria, A., Valletta, R., Martina, R., and Rengo, Sandro

Published
2009

27. Cytotoxicity of nickel chloride and his effect on cell cycle

Author

SPAGNUOLO, GIANRICO, RENGO, SANDRO, Polito I., D'Antò V., Martina R., NETTI, PAOLO ANTONIO, Valletta R., Spagnuolo, Gianrico, Polito, I., D'Antò, V., Martina, R., Netti, PAOLO ANTONIO, Rengo, Sandro, and Valletta, R.

Published
2008

32. MTA effects on primary Human Dental Pulp Cells

Author

SPAGNUOLO, GIANRICO, RENGO, SANDRO, D’Antò V, D’Ambrosio C, Simeone M, Spagnuolo, Gianrico, D’Antò, V, D’Ambrosio, C, Simeone, M, and Rengo, Sandro

Published
2006

34. Effetto del ProRoot-MTA su cellule pulpari umane

Author

RENGO, SANDRO, SIMEONE, MICHELE, SPAGNUOLO, GIANRICO, D’Antò V, D’Ambrosio C, Spagnuolo, Gianrico, Dant, V, Dambrosio, C, Simeone, Michele, Rengo, S., Rengo, Sandro, D’Antò, V, and D’Ambrosio, C

Published
2006

35. The HOX gene network in human odontogenesis and in ameloblastomas

Author

D'Antò V., Schiavo G., Cantile M., D'Armiento M., Terracciano L., Jundt G., Cillo C., SPAGNUOLO, GIANRICO, RENGO, SANDRO, D'Antò, V., Schiavo, G., Cantile, M., D'Armiento, M., Spagnuolo, Gianrico, Rengo, Sandro, Terracciano, L., Jundt, G., and Cillo, C.

Published
2006

37. Hema effect on ERK and PI3K/AKT survival pathways in HPC

Author

SPAGNUOLO, GIANRICO, RENGO, SANDRO, D'Antò V., Schweikl H., Valletta R., Schmalz G., Martina R., Spagnuolo, Gianrico, D'Antò, V., Schweikl, H., Valletta, R., Schmalz, G., Martina, R., and Rengo, Sandro

Published
2006

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