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202 results on '"Lazzerini, G."'

2. A NEW METHOD TO EXTRACT THE WORKLOAD OF INTERVENTIONAL PROCEDURES

Author

Giomi, S., primary, Avitabile, R., additional, Bartoli, A., additional, Biondi, M., additional, Bortoli, E., additional, Busatti, E., additional, Coppolaro, A., additional, Tozzi, A., additional, Guasti, A., additional, Cimmino, M.C., additional, Coppola, C., additional, and Lazzerini, G., additional

Published
2023
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12. C-Si hybrid photonic structures by full infiltration of conjugated polymers into porous silicon rugate filters

Author

Robbiano, Valentina, Surdo, Salvatore, Minotto, Alessandro, Canazza, Giancarlo, Lazzerini, G Mattia, Mian, Shabbir M, Comoretto, Davide, Barillaro, Giuseppe, Cacialli, Franco, Robbiano, V, Surdo, S, Minotto, A, Canazza, G, Lazzerini, G, Mian, S, Comoretto, D, Barillaro, G, and Cacialli, F

Subjects
Electrochemical etching, polyfluorene derivative, photoluminescence modification, radiative decay rate, silicon photonics, hybrid photonics, Biotechnology, Electronic, Optical and Magnetic Materials, Ceramics and Composites, Electrical and Electronic Engineering, hybrid photonic, Electronic, Optical and Magnetic Materials
Abstract

Loading of one-dimensional (1-D) porous silicon photonic crystals (PS-PhCs), known as rugate filters, with luminescent materials is generally limited by the potential for (undesired) “pore clogging,” in relation to the size of the nanoparticles (e.g. quantum dots) or molecular species, and so far mainly restricted to small molecular weight materials or small nanocrystals, or in situ polymerized dyes. Here we report the infiltration 1-D PS-PhCs with a green-emitting commercial luminescent polymer (F8BT, poly[(9,9-di-n-octylfluorenyl-2,7-diyl)-alt-(benzo[2,1,3]thiadiazol-4,8-diyl)]), with a molecular weight of approximately 46 kDa across their whole depth (approximately 7.5 μm), thereby showing that pore clogging is not a concern for these structures. We also characterize the modification of the photoluminescence (PL) and decay rates, and investigate the detailed inner morphology of the filters with the help of (scanning) transmission electron microscopy. We observe both suppression (in the stop-band) and enhancement (at the high-energy band-edge) of the PL. We also find that the photonic stop-band is red-shifted after polymer infiltration, due to the increased effective refractive index of the polymer-infiltrated nanostructured system. The presence of just one unbroadened peak in the reflectance spectra after infiltration confirms that infiltration extends for the whole depth of the rugate filters.

Published
2018

25. NA+/H+ exchanger 1- and aquaporin-1-dependent hyperosmolarity changes decrease nitric oxide production and induce VCAM-I expression in endothelial cells exposed to high glucose

Author

Madonna, R., Montebello, E., Lazzerini, G., Zurro, M., and De Caterina, R.

Subjects
Inflammation, Sodium-Hydrogen Exchanger 1, Sodium-Hydrogen Exchangers, Aquaporin 1, Blotting, Thoracic, Hyperosmolarity, Osmolar Concentration, Endothelial Cells, Vascular Cell Adhesion Molecule-1, Nitric oxide, Flow Cytometry, Small Interfering, Diabetes mellitus, Glucose, Aorta, Thoracic, Blotting, Western, Cation Transport Proteins, Humans, Mannitol, Nitric Oxide, Protein Kinase C, Protein Kinase C beta, RNA, Small Interfering, RNA, Western, Aorta
Published
2010

38. Inhibition of endothelial cell activation by nitric oxide donors

Author

Zampolli A, Giuseppina Basta, Lazzerini G, Feelisch M, and De Caterina R

Subjects
Nitrates, Transcription, Genetic, Histocompatibility Antigens Class II, Vascular Cell Adhesion Molecule-1, Dipeptides, Intercellular Adhesion Molecule-1, Glutathione, Interferon-gamma, Structure-Activity Relationship, S-Nitrosoglutathione, Cell Adhesion, Humans, Drug Interactions, Nitric Oxide Donors, Prodrugs, Cysteine, Endothelium, Vascular, RNA, Messenger, Sulfhydryl Compounds, E-Selectin, Interleukin-1, Nitroso Compounds
Abstract

Because nitric oxide (NO) inhibits the expression of endothelial leukocyte adhesion molecules, NO-generating compounds have major therapeutic potential for use outside their classical indications. We report on the in vitro potential antiatherogenicity of two novel cysteine-containing NO donors, SP/W 3672, a fast spontaneous NO releaser, and its prodrug SP/W 5186, which liberates NO after bioactivation. The ability of these two compounds to inhibit monocyte adhesion and surface expression of endothelial adhesion molecules was evaluated and compared with that of other NO donors. SP/W 5186 and SP/W 3672 inhibited the adhesion of U937 monocytes to cultured human endothelial cells more potently than S-nitrosoglutathione (GSNO) or spermine NONOate, whereas nitroglycerin and isosorbide dinitrate were ineffective at comparable concentrations. A similar rank order of potency was found for the inhibition of expression of the adhesion molecules vascular cell adhesion molecule-1, intercellular adhesion molecule-1, and E-selectin as well as for major histocompatibility complex class II antigen expression. Estimated IC(50) values for vascular cell adhesion molecule-1 were400 microM for SP/W 4744 (control for SP/W 3672 lacking the cysteine moiety), 200 microM for GSNO and spermine NONOate, 80 microM for SP/W 3672, and 50 microM for SP/W 5186. Moreover, SP/W 5186 inhibited VCAM-1 mRNA levels more potently than GSNO. This effect was likely to be transcriptional because mRNA degradation was not affected. In conclusion, SP/W 3672 and SP/W 5186 are novel potent inhibitors of endothelial activation, and this effect appears to relate to their ability to liberate NO for prolonged periods of time, either spontaneously or after conversion to active hydrolytic products.

Published
2000

39. Photoinduced work function changes by isomerization of a densely packed azobenzene-based SAM on Au: a joint experimental and theoretical study

Author

Crivillers, N, Liscio, A, Di Stasio, F, Van Dyck, C, Osella, S, Cornil, D, Mian, S, Lazzerini, G M, Fenwick, O, Orgiu, E, Reinders, F, Braun, Slawomir, Fahlman, Mats, Mayor, M, Cornil, J, Palermo, V, Cacialli, F, Samori, P, Crivillers, N, Liscio, A, Di Stasio, F, Van Dyck, C, Osella, S, Cornil, D, Mian, S, Lazzerini, G M, Fenwick, O, Orgiu, E, Reinders, F, Braun, Slawomir, Fahlman, Mats, Mayor, M, Cornil, J, Palermo, V, Cacialli, F, and Samori, P

Abstract

Responsive monolayers are key building blocks for future applications in organic and molecular electronics in particular because they hold potential for tuning the physico-chemical properties of interfaces, including their energetics. Here we study a photochromic SAM based on a conjugated azobenzene derivative and its influence on the gold work function (Phi(Au)) when chemisorbed on its surface. In particular we show that the Phi(Au) can be modulated with external stimuli by controlling the azobenzene trans/cis isomerization process. This phenomenon is characterized experimentally by four different techniques, kelvin probe, kelvin probe force microscopy, electroabsorption spectroscopy and ultraviolet photoelectron spectroscopy. The use of different techniques implies exposing the SAM to different measurement conditions and different preparation methods, which, remarkably, do not alter the observed work function change (Phi(trans)-Phi(cis)). Theoretical calculations provided a complementary insight crucial to attain a deeper knowledge on the origin of the work function photo-modulation., NanoSci-E+ project SENSORS||International Center for Frontier Research in Chemistry (FRC, Strasbourg)||Belgian National Fund for Scientific Research (FNRS)||Swiss Nationals Science Foundation (SNF)||Swiss Nanoscience Institute (SNI)

Published
2011
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