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629 results on '"Bortolotti M"'

19. Dauphiné twinning and texture memory in polycrystalline quartz. Part 3: texture memory during phase transformation

Author

Wenk, Hans-Rudolf, Barton, N., Bortolotti, M., Vogel, S. C., Voltolini, M., Lloyd, G. E., and Gonzalez, G. B.

Subjects
Earth Sciences, Mineral Resources, Geochemistry, Mineralogy, Crystallography, Quartz phase transformation, Texture memory, Twinning, Neutron diffraction
Abstract

Samples of quartz-bearing rocks were heated above the α (trigonal)–β (hexagonal) phase transformation of quartz (625–950°C) to explore changes in preferred orientation patterns. Textures were measured both in situ and ex situ with neutron, synchrotron X-ray and electron backscatter diffraction. The trigonal–hexagonal phase transformation does not change the orientation of c- and a-axes, but positive and negative rhombs become equal in the hexagonal β-phase. In naturally deformed quartzites measured by neutron diffraction a perfect texture memory was observed, i.e. crystals returned to the same trigonal orientation they started from, with no evidence of twin boundaries. Samples measured by electron back-scattered diffraction on surfaces show considerable twinning and memory loss after the phase transformation. In experimentally deformed quartz rocks, where twinning was induced mechanically before heating, the orientation memory is lost. A mechanical model can explain the memory loss but so far it does not account for the persistence of the memory in quartzites. Stresses imposed by neighboring grains remain a likely cause of texture memory in this mineral with a very high elastic anisotropy. If stresses are imposed experimentally the internal stresses are released during the phase transformation and the material returns to its original state prior to deformation. Similarly, on surfaces there are no tractions and thus texture memory is partially lost.

Published
2009

23. P1525: MANAGEMENT OF AUTOIMMUNE HAEMOLYTIC ANAEMIA DURING PREGNANCY OR POST-PARTUM: AN INTERNATIONAL MULTI-CENTRE EXPERIENCE.

Author

Bortolotti, M., primary, Fantini, N. N., additional, Glenthoj, A., additional, Michel, M., additional, Napolitano, M., additional, Raso, S., additional, Chen, F., additional, McDonald, V., additional, Murakhovskaya, I., additional, Vos, J. M. I., additional, Patriarca, A., additional, Mingot-Castellano, M. E., additional, Prati, D., additional, Barcellini, W., additional, and Fattizzo, B., additional

Published
2022
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24. Efficacy and safety of cyclosporine A treatment in autoimmune cytopenias: the experience of two Italian reference centers

Author

Fattizzo, B., Cantoni, S., Giannotta, J.A., Bandiera, L., Zavaglia, R., Bortolotti, M., and Barcellini, W.

Subjects
Evans syndrome, autoimmune hemolytic anemia, cyclosporine A, immune thrombocytopenia, Settore MED/15 - Malattie del Sangue
Abstract

Immune thrombocytopenia (ITP) and autoimmune hemolytic anemia (AIHA) show good responses to frontline steroids. About two-third of cases relapse and require second-line treatment, including rituximab, mainly effective in AIHA, and thrombopoietin-receptor agonists (TPO-RAs) in ITP, while the use of splenectomy progressively decreased due to concerns for infectious/thrombotic complications. For those failing second line, immunosuppressants may be considered.The aim of this study was to evaluate the efficacy of cyclosporine treatment in patients with ITP and AIHA.In this retrospective study, we evaluated the efficacy and safety of cyclosporine A (CyA) in ITP (Responses were classified as partial [Hb 10 or at least 2 g/dl increase from baseline, platelets (PLT) 30 × 10The median time from diagnosis to CyA was 35 months (3-293), and patients had required a median of 4 (1-8) previous therapy lines. Median duration of CyA was 28 (2-140) months and responses were achieved in 86% of ITP and 50% of AIHA subjects. Responders could reduce or discontinue concomitant treatment and resolved PLT fluctuations on TPO-RA. CyA was generally well tolerated, and only two serious infectious complications in elderly patients on concomitant steroids suggesting caution in this patient population.CyA may be advisable in ITP, which is not well controlled under TPO-RA, and in AIHA failing rituximab, particularly if ineligible in clinical trial.

Published
2021

25. A structural and thermal investigation of Li-doped high entropy (Mg, Co, Ni, Cu, Zn)O obtained by co-precipitation

Author

Spiridigliozzi, L., Dell'Agli, G., Callone, E., Dire, S., Campostrini, R., Bettotti, P., Bortolotti, M., Speranza, G., Sglavo, V. M., and Biesuz, M.

Subjects
Transition metal alloys and compounds, Electron paramagnetic resonance, Entropy, Nuclear resonances, Oxide materials, Precipitation, Mechanics of Materials, Mechanical Engineering, Materials Chemistry, Metals and Alloys
Published
2022

28. COP26 Special Hydrogen Report : Hydrogen - Enabling a zero-emission society

Author

Bonnet-Cantalloube, B., Bortolotti, M., Floristean, A., Mester, F., Pawelec, G., Bonnet-Cantalloube, B., Bortolotti, M., Floristean, A., Mester, F., and Pawelec, G.

Abstract

This report aims to highlight how hydrogen is a key piece of the climate neutrality jigsaw., This report aims to highlight how hydrogen is a key piece of the climate neutrality jigsaw.

Published
2021

33. Clinical and biological efficacy of preservative-free NAAGA eye-drops versus levocabastine eye-drops in vernal keratoconjunctivitis patients

Author

Leonardi, A., Bremond-Gignac, D., Bortolotti, M., Violato, D., Pouliquen, P., Delval, L., Grouin, J.M., and Fregona, I.A.

Subjects
Keratoconjunctivitis -- Care and treatment, Neuropeptides -- Dosage and administration, Neuropeptides -- Research, Levocabastine -- Dosage and administration, Levocabastine -- Research, Ophthalmic solutions -- Dosage and administration, Ophthalmic solutions -- Comparative analysis, Health
Published
2007

39. Increasing exploration efficiency with SOLSA Expert System

Author

Guen, M. Le, primary, Mendili, Y. El, additional, Duee, C., additional, Orberger, B., additional, Pilliere, H., additional, Delchini, S., additional, Bessin, C., additional, Borovin, E., additional, Kanzari, A., additional, Lutterotti, L., additional, Bortolotti, M., additional, Secchi, M., additional, Chateigner, D., additional, El Mendili, A., additional, Lefevre, T., additional, Grazulis, S., additional, Mariotto, G., additional, Nolte, H., additional, and Teerlink, T., additional

Published
2020
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