102,272 research outputs found
m-Bonacci graceful labeling
No full textWe introduce new labeling called m-bonacci graceful labeling. A graph G on n edges is m-bonacci graceful if the vertices can be labeled with distinct integers from the set such that the derived edge labels are the first n m-bonacci numbers. We show that complete graphs, complete bipartite graphs, gear graphs, triangular grid graphs, and wheel graphs are not m-bonacci graceful. Almost all trees are m-bonacci graceful. We give m-bonacci graceful labeling to cycles, friendship graphs, polygonal snake graphs, and double polygonal snake graphs
String attractors of fixed points of k-bonacci-like morphisms
No full textpeer reviewedFirstly studied by Kempa and Prezza in 2018 as the cement of text compression algorithms, string attractors have become a compelling object of theoretical research within the community of combinatorics on words. In this context, they have been studied for several families of finite and infinite words. In this paper, we obtain string attractors of prefixes of particular infinite words generalizing k-bonacci words (including the famous Fibonacci word) and obtained as fixed points of k-bonacci-like morphisms. In fact, our description involves the numeration systems classically derived from the considered morphisms
Diffraction by m-bonacci gratings
No full textWe present a simple diffraction experiment with m-bonacci gratings as a new
interesting generalization of the Fibonacci ones. Diffraction by these nonconventional
structures is proposed as a motivational strategy to introduce
students to basic research activities. The Fraunhofer diffraction patterns are
obtained with the standard equipment present in most undergraduate physics
labs and are compared with those obtained with regular periodic gratings. We
show that m-bonacci gratings produce discrete Fraunhofer patterns characterized
by a set of diffraction peaks which positions are related to the
concept of a generalized golden mean. A very good agreement is obtained
between experimental and numerical results and the students’ feedback is
discussed.This work was supported in part by the Ministerio de Economia y Competividad under grants FIS2011-23175 and DPI2012-32994, by Generalitat Valenciana under grant PROMETEOII/2014/072, and by the Universitat de Valencia under grant UV-SFPIE_DINV14-222801. This work has been developed by the Teaching Innovation Groups from the Universitat Politecnica de Valencia (MoMa) and the Universitat de Valencia (GCI35/2009).Monsoriu Serra, JA.; Giménez Valentín, MH.; Furlan, WD.; Barreiro, JC.; Saavedra, G. (2015). Diffraction by m-bonacci gratings. European Journal of Physics. 36(6):1-9. https://doi.org/10.1088/0143-0807/36/6/065005S1936
Seconde séance du séminaire "Indexer les corpus numériques" le 29 mars 2019 à Saint-Etienne
No full textLieu : Université Jean Monnet Saint-Étienne – 33 rue du 11 Novembre | Bât. G | Salle G0.5L' IHRIM (UMR 5317) organise le 29 mars 2019 à l’université Jean Monnet de Saint-Étienne la seconde séance du séminaire "Indexer les corpus numériques".Le programme est à télécharger ici Les inscriptions sont gratuites mais obligatoires avant le 22 mars auprès de Fabienne Vial-Bonacci : [email protected] Vous pouvez trouver l’ensemble des communications de la première séance à cette adresse..
Capturing host-pathogen interactions by protein microarrays: identification of novel streptococcal proteins binding to human fibronectin, fibrinogen, and C4BP.
No full textMicrobial pathogen entry and survival in the host is mediated by a network of molecular interactions between the two partners, which has been the subject of many research efforts. A complex picture is emerging in which host-pathogen crosstalk involves a high number of proteins, often with redundant functions. In the present study, we investigated the potential of protein microarrays to simultaneously scan interactions between surface proteins from two main human streptococcal pathogens, Streptococcus pyogenes and Streptococcus agalactiae, and three human ligands, fibronectin, fibrinogen, and C4 binding protein, known to play an important role in streptococcal pathogenesis. By using this technology, we confirmed interactions described in the literature and detected a novel set of streptococcal proteins with binding capacities for the human ligands. The observations were validated by Western blot and ELISA techniques. Three of the newly identified proteins were isoforms of a group B streptococcus-secreted component named Fib and displayed differential binding capacities for fibronectin, fibrinogen, and C4BP. The protein regions involved in the interaction with each ligand were identified by constructing fragments of one of the Fib variants. The approach proved valuable for the acquisition of novel insights into the complex network of protein-protein interactions occurring during microbial infection.-Margarit, I., Bonacci, S., Pietrocola, G., Rindi, S., Ghezzo, C., Bombaci, M., Nardi-Dei, V., Grifantini, R., Speziale, P., Grandi, G. Capturing host-pathogen interactions by protein microarrays: identification of novel streptococcal proteins binding to human fibronectin, fibrinogen and C4BP
"Imparare e insegnare l'italiano come lingua seconda" G. Pallotti e AIPI, Bonacci, Roma, 2005
No full textDiffractive m-bonacci lenses
No full text[EN] Fibonacci zone plates are proving to be promising candidates in image forming devices. In this letter we show that the set of Fibonacci zone plates are a particular member of a new family of diffractive lenses which can be designed on the basis of a given m-bonacci sequence. These lenses produce twin axial foci whose separation depends on the m-golden mean. Therefore, with this generalization, bifocal systems can be freely designed under the requirement at particular focal planes. Experimental results support our proposal. (C) 2017 Optical Society of AmericaThis work was supported by the Ministerio de Economia y Competitividad and FEDER (Grant DPI2015-71256-R) and by the Generalitat Valenciana (Grant PROMETEOII-2014-072), Spain.Machado, F.; Ferrando, V.; Furlan, WD.; Monsoriu Serra, JA. (2017). Diffractive m-bonacci lenses. Optics Express. 25(7):8267-8273. https://doi.org/10.1364/OE.25.008267S82678273257Saavedra, G., Furlan, W. D., & Monsoriu, J. A. (2003). Fractal zone plates. Optics Letters, 28(12), 971. doi:10.1364/ol.28.000971Monsoriu, J. A., Zapata-Rodríguez, C. J., & Furlan, W. D. (2006). Fractal axicons. Optics Communications, 263(1), 1-5. doi:10.1016/j.optcom.2006.01.020Zhang, Q., Wang, J., Wang, M., Bu, J., Zhu, S., Gao, B. Z., & Yuan, X. (2012). Depth of focus enhancement of a modified imaging quasi-fractal zone plate. Optics & Laser Technology, 44(7), 2140-2144. doi:10.1016/j.optlastec.2012.03.012Furlan, W. D., Saavedra, G., & Monsoriu, J. A. (2007). White-light imaging with fractal zone plates. Optics Letters, 32(15), 2109. doi:10.1364/ol.32.002109Ferrando, V., Giménez, F., Furlan, W. D., & Monsoriu, J. A. (2015). Bifractal focusing and imaging properties of Thue–Morse Zone Plates. Optics Express, 23(15), 19846. doi:10.1364/oe.23.019846Giménez, F., Furlan, W. D., Calatayud, A., & Monsoriu, J. A. (2010). Multifractal zone plates. Journal of the Optical Society of America A, 27(8), 1851. doi:10.1364/josaa.27.001851Monsoriu, J. A., Saavedra, G., & Furlan, W. D. (2004). Fractal zone plates with variable lacunarity. Optics Express, 12(18), 4227. doi:10.1364/opex.12.004227Dai, H., Liu, J., Xuecheng, S., & Dejin, Y. (2008). Programmable fractal zone plates (FraZPs) with foci finely tuned. Optics Communications, 281(22), 5515-5519. doi:10.1016/j.optcom.2008.07.083Verma, R., Sharma, M. K., Senthilkumaran, P., & Banerjee, V. (2014). Analysis of Fibonacci gratings and their diffraction patterns. Journal of the Optical Society of America A, 31(7), 1473. doi:10.1364/josaa.31.001473Giménez, F., Monsoriu, J. A., Furlan, W. D., & Pons, A. (2006). Fractal photon sieve. Optics Express, 14(25), 11958. doi:10.1364/oe.14.011958Ferrando, V., Calatayud, A., Giménez, F., Furlan, W. D., & Monsoriu, J. A. (2013). Cantor dust zone plates. Optics Express, 21(3), 2701. doi:10.1364/oe.21.002701Tao, S. H., Yang, B. C., Xia, H., & Yu, W. X. (2013). Tailorable three-dimensional distribution of laser foci based on customized fractal zone plates. Laser Physics Letters, 10(3), 035003. doi:10.1088/1612-2011/10/3/035003Calabuig, A., Sánchez-Ruiz, S., Martínez-León, L., Tajahuerce, E., Fernández-Alonso, M., Furlan, W. D., … Pons-Martí, A. (2013). Generation of programmable 3D optical vortex structures through devil’s vortex-lens arrays. Applied Optics, 52(23), 5822. doi:10.1364/ao.52.005822Pu, J., & Jones, P. H. (2015). Devil’s lens optical tweezers. Optics Express, 23(7), 8190. doi:10.1364/oe.23.008190Cheng, S., Zhang, X., Ma, W., & Tao, S. (2016). Fractal zone plate beam based optical tweezers. Scientific Reports, 6(1). doi:10.1038/srep34492Ge, X., Wang, Z., Gao, K., Wang, D., Wu, Z., Chen, J., … Wu, Z. (2012). Use of fractal zone plates for transmission X-ray microscopy. Analytical and Bioanalytical Chemistry, 404(5), 1303-1309. doi:10.1007/s00216-012-6126-0Furlan, W. D., Ferrando, V., Monsoriu, J. A., Zagrajek, P., Czerwińska, E., & Szustakowski, M. (2016). 3D printed diffractive terahertz lenses. Optics Letters, 41(8), 1748. doi:10.1364/ol.41.001748Barrera, J. F., Tebaldi, M., Amaya, D., Furlan, W. D., Monsoriu, J. A., Bolognini, N., & Torroba, R. (2012). Multiplexing of encrypted data using fractal masks. Optics Letters, 37(14), 2895. doi:10.1364/ol.37.002895Tebaldi, M., Furlan, W. D., Torroba, R., & Bolognini, N. (2009). Optical-data storage-readout technique based on fractal encrypting masks. Optics Letters, 34(3), 316. doi:10.1364/ol.34.000316Yadav, A. K., Vashisth, S., Singh, H., & Singh, K. (2015). A phase-image watermarking scheme in gyrator domain using devil’s vortex Fresnel lens as a phase mask. Optics Communications, 344, 172-180. doi:10.1016/j.optcom.2015.01.019Verma, R., Banerjee, V., & Senthilkumaran, P. (2014). Fractal signatures in the aperiodic Fibonacci grating. Optics Letters, 39(9), 2557. doi:10.1364/ol.39.002557Wu, K., & Wang, G. P. (2016). Two-dimensional Fibonacci grating for far-field super-resolution imaging. Scientific Reports, 6(1). doi:10.1038/srep38651Ferrando, V., Calatayud, A., Andres, P., Torroba, R., Furlan, W. D., & Monsoriu, J. A. (2014). Imaging Properties of Kinoform Fibonacci Lenses. IEEE Photonics Journal, 6(1), 1-6. doi:10.1109/jphot.2014.2304560Gao, N., Zhang, Y., & Xie, C. (2011). Circular Fibonacci gratings. Applied Optics, 50(31), G142. doi:10.1364/ao.50.00g142Monsoriu, J. A., Calatayud, A., Remon, L., Furlan, W. D., Saavedra, G., & Andres, P. (2013). Bifocal Fibonacci Diffractive Lenses. IEEE Photonics Journal, 5(3), 3400106-3400106. doi:10.1109/jphot.2013.2248707Calatayud, A., Ferrando, V., Remón, L., Furlan, W. D., & Monsoriu, J. A. (2013). Twin axial vortices generated by Fibonacci lenses. Optics Express, 21(8), 10234. doi:10.1364/oe.21.010234Ke, J., & Zhang, J. (2015). Generalized Fibonacci photon sieves. Applied Optics, 54(24), 7278. doi:10.1364/ao.54.007278Monsoriu, J. A., Giménez, M. H., Furlan, W. D., Barreiro, J. C., & Saavedra, G. (2015). Diffraction bym-bonacci gratings. European Journal of Physics, 36(6), 065005. doi:10.1088/0143-0807/36/6/06500
Wohlfahrtiosis in italy: A case in a puppy and overview of geographical distribution
No full textThe report describes a case of urogenital myiasis in a puppy, Canis lupus familiaris (Carnivora: Canidae) caused by Wohlfahrtia magnifica (Diptera: Sarcophagidae) in Calabria, southern Italy. This species is an obligatory agent of myiasis in human and other warm-blooded vertebrates. The puppy was healthy and was not living near farm animals, usual hosts of this flesh fly. An overview of cases of human and animal myiasis caused by W. magnifica in Italy and of data and specimens documented in entomology museum collections is also reported
Smart working as an organisational process or as a social change? An Italian pandemic experience
No full textPurpose: Along the coronavirus pandemic, huge business challenges are facing as a result of collapsing customer demand and organisational significant changes supported by digital development, while the increasing social and environmental needs involve business and individuals. The authors argue that this trend is modifying organisational and market logic, replacing them with values and practices linked to community-based models. The present work aims to study the impact that smart working (SW) has on the worker, seen both as a member of the organisation and the social community. Design/methodology/approach: The study data were collected from a computer-assisted web interview administered in 2020 to public employees working for health agencies across the Campania region, in South Italy. To test the conceptual model, partial least squares-structural equation modelling is used. Considering the abductive soul of the research, the study represents a pilot survey that will deliver stochastic results to be subsequently replicated in all Italian health agencies. Findings: The results of the research highlighted how the evolutionary dynamics of SW employees tend towards a reconceptualisation of workspaces, a redefinition of time and emotions and a better balance between work and personal life, thus creating a greater space for social and community aspects and determining a greater involvement in their working life. Originality/value: This research introduces a new win-win logic in the labour market, one capable of generating advantages for people, organisations and the entire social system by allowing workers to better reconcile working times with their personal needs and with flexibility demands coming from companies
Prevalenza delle fratture in altre sedi in pazienti con fratture vertebrali: uno studio retrospettivo
No full textIntroduzione
I principali fattori di rischio di frattura sono rappresentati da un’alterata densità dell’osso, l’età, le cadute e la
presenza di pregresse fratture. Numerosi studi hanno evidenziato che la presenza e soprattutto la gravità delle
fratture vertebrali da fragilità possono aumentare il rischio di sviluppare nuove fratture vertebrali. Pochi studi
invece hanno valutato il rischio di sviluppare fratture in altre sedi in pazienti con almeno una frattura vertebrale.
L’obiettivo primario del nostro studio è stato investigare la correlazione tra la severità delle fratture vertebrali
da fragilità e la presenza di concomitanti fratture non vertebrali. L’obiettivo secondario è stato valutare
la correlazione tra fratture vertebrali e non vertebrali, escludendo le fratture femorali.
Metodi
Abbiamo analizzato in modo retrospettivo i dati clinici e densitometrici di soggetti di entrambi i sessi con almeno
una deformità vertebrale riscontrata all’esame morfometrico. La gravità e il numero di tali deformità sono
stati quantificati utilizzando lo spine deformity index (SDI). I pazienti sono stati successivamente divisi in
2 gruppi: soggetti con SDI ≤2 e soggetti con SDI ≥3. In entrambi i gruppi abbiamo valutato il rischio di fratture
extra-vertebrali nei pazienti che avevano già subito fratture vertebrali (estremo prossimale di omero, polso,
estremo prossimale di femore, coste, bacino etc.).
Risultati
La nostra popolazione era costituita da 497 soggetti (età media 67,14±10,51 DS). I pazienti con uno SDI uguale
o superiore a 3 (49%) avevano un rischio significativamente aumentato di avere una frattura non vertebrale
(Odds Ratio age adjusted: 1,496 IC 95%: 1,032-2,168), che veniva conservato anche escludendo le fratture di femore
(Odds Ratio age adjusted 1,483 IC 95%: 1,007-2,184).
Bibliografia
Gallagher JC et al. Teriparatide reduces the fracture risk associated with increasing number and severity of osteoporotic fractures. J Clin Endocrinol Metab.
2005 Mar;90(3):1583-
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