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331 results on '"Bongiorno D"'

1. Rolewicz-type chaotic operators

Author

Bongiorno, D., Darji, U. B., and Di Piazza, L.

Subjects
Mathematics - Functional Analysis, 47A16, 47B37, 37B99
Abstract

In this article we introduce a new class of Rolewicz-type operators in l_p, $1 \le p < \infty$. We exhibit a collection F of cardinality continuum of operators of this type which are chaotic and remain so under almost all finite linear combinations, provided that the linear combination has sufficiently large norm. As a corollary to our main result we also obtain that there exists a countable collection of such operators whose all finite linear combinations are chaotic provided that they have sufficiently large norm., Comment: 15 pages

Published
2015

8. A generalized first-return integration process

Author

Bongiorno D, Maria Stella Mongiovì, Michele Sciacca, Salvatore Triolo, and Bongiorno D

Subjects
Settore MAT/05 - Analisi Matematica, First return integral, Lebesgue improper integral
Abstract

We extend the first-return integration process, introduced in [5] by U.B. Darji and M.J. Evans, and prove that each Lebesgue-improper integrable function f : [a, b] --> R is first-return integrable in this generalized sense to (Li)int_a^b f(t) dt.

Published
2020

19. DIFFUSIONE DI ENTEROCOCCHI VANCOMICINA-RESISTENTI (VRE) NELL’AREA DI TRIESTE

Author

Knezevich, A., Di Santolo, M., Busetti, M., Fabris, C., Mascarello, M., Santagati, M., Bongiorno, D., Campanile, F., LAGATOLLA, CRISTINA, BRESSAN, RAFFAELA, DOLZANI, LUCILLA, A. Knezevich, M. Di Santolo, M. Busetti, C. Lagatolla, C. Fabris, R. Bressan, L. Dolzani, M. Mascarello, M. Santagati, D. Bongiorno, F. Campanile, Knezevich, A., Di Santolo, M., Busetti, M., Lagatolla, Cristina, Fabris, C., Bressan, Raffaela, Dolzani, Lucilla, Mascarello, M., Santagati, M., Bongiorno, D., and Campanile, F.

Subjects
outbreak, VRE, VRE, outbreak
Published
2016

20. Structure-based drug design, synthesis and biological assays of P. falciparum Atg3–Atg8 protein–protein interaction inhibitors

Author

Villa, S, Legnani, L, Colombo, D, Gelain, A, Lammi, C, Bongiorno, D, Ilboudo, D, Mcgee, K, Bosch, J, Grazioso, G, Stefania Villa, Laura Legnani, Diego Colombo, Arianna Gelain, Carmen Lammi, Daniele Bongiorno, Denise P. Ilboudo, Kellen E. McGee, Jürgen Bosch, Giovanni Grazioso, Villa, S, Legnani, L, Colombo, D, Gelain, A, Lammi, C, Bongiorno, D, Ilboudo, D, Mcgee, K, Bosch, J, Grazioso, G, Stefania Villa, Laura Legnani, Diego Colombo, Arianna Gelain, Carmen Lammi, Daniele Bongiorno, Denise P. Ilboudo, Kellen E. McGee, Jürgen Bosch, and Giovanni Grazioso

Abstract

The proteins involved in the autophagy (Atg) pathway have recently been considered promising targets for the development of new antimalarial drugs. In particular, inhibitors of the protein–protein interaction (PPI) between Atg3 and Atg8 of Plasmodium falciparum retarded the blood- and liver-stages of parasite growth. In this paper, we used computational techniques to design a new class of peptidomimetics mimicking the Atg3 interaction motif, which were then synthesized by click-chemistry. Surface plasmon resonance has been employed to measure the ability of these compounds to inhibit the Atg3–Atg8 reciprocal protein–protein interaction. Moreover, P. falciparum growth inhibition in red blood cell cultures was evaluated as well as the cyto-toxicity of the compounds.

Published
2018

21. Degrees of freedom effect on fragmentation in tandem mass spectrometry of singly charged supramolecular aggregates of sodium sulfonates

Author

Indelicato, S., Bongiorno, D., Drahos, L., TURCO LIVERI, V., Turiàk, L., Vèkey, K., Ceraulo, L., Indelicato, S, Bongiorno, D, Drahos, L, Turco Liveri, V, TuriàK, L, Vèkey, K, and Ceraulo, L

Subjects
Ions, Mesylates, Supramolecular aggregates, MS/MS, Degrees of Freedom effect, fragmentation, activation energy, Spectrometry, Mass, Electrospray Ionization, Alkanesulfonic Acids, Supramolecular aggregate, Tandem Mass Spectrometry, Sodium, Enkephalin, Leucine
Abstract

The characteristic collision energy (CCE) to obtain 50% fragmentation of positively and negatively single charged noncovalent clusters has been measured. CCE was found to increase linearly with the degrees of freedom (DoF) of the precursor ion, analogously to that observed for synthetic polymers. This suggests that fragmentation behavior (e.g. energy randomization) in covalent molecules and clusters are similar. Analysis of the slope of CCE with molecular size (DoF) indicates that activation energy of fragmentation of these clusters (loss of a monomer unit) is similar to that of the lowest energy fragmentation of protonated leucine-enkephalin. Positively and negatively charged aggregates behave similarly, but the slope of the CCE versus DoF plot is steeper for positive ions, suggesting that these are more stable than their negative counterparts.

Published
2013

22. Do electrospray mass spectra of surfactants mirror their aggregation state in solution?

Author

Bongiorno, D, Ceraulo, L, Giorgi, G, Indelicato, S, Turco Liveri, V, Bongiorno, D, Ceraulo, L, Giorgi, G, Indelicato, S, and Turco Liveri, V

Subjects
surfactant, IRMPD, aggregation, AOT, mass spectrometry, Settore CHIM/02 - Chimica Fisica
Abstract

One important feature in the gas phase chemistry of surfactants is to ascertain whether their aggregates produced by electrospray ionization reflect those formed in the starting solution. With this aim, we have performed ESI-MS, ESI-MS/MS and ER-MS spectra of bis(2-ethylhexyl)sulfosuccinate (AOTNa) solutions in different solvents, i.e. water, water/methanol, methanol and n-hexane. The results clearly indicate that, notwithstanding the strongly different aggregation state in solution (direct micelles in water and in water/methanol, molecular dispersion in methanol and reverse micelles in n-hexane) and marked effects of the solvent polarity on the total ionic current, the surfactant aggregates in gas phase show identical structural features. Analogous conclusions can be drawn analyzing the infrared multiple photon dissociation (IRMPD) spectra of AOTNa solutions in water/methanol and n-hexane. Moreover, according to the idea that gas phase can be considered an apolar environment par excellence, data consistently suggest a reverse micelle-like aggregation. Some peculiarities of the mechanisms leading to aggregate formation through electrospray ionization of surfactant solutions in solvent media with different polarity have been also discussed.

Published
2011

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