121,623 research outputs found
L’ E-procurement nella sanità italiana: alcuni spunti di riflessione
No full textPremessa. – Parte Prima: I. Sistemi Sanitari Regionali e processi di acquisto (G. Ferrara-S. Pozzoli). – II. La gestione degli approvvigionamenti nell’esperienza delle aziende private (D. Mancini). – III. I sistemi sanitari regionali (A. Scaletti). – IV. L’ E-procurement nella sanità italiana: alcuni spunti di riflessione (V. Mele). – Parte Seconda: I. Il governo interaziendale della funzione di acquisto nella sanità della Regione Toscana (M. Braganti-T. Di Grezia). – II. Il governo interaziendale della funzione di acquisto nella sanità della Regione Lombardia (T. Di Grezia). – III. La funzione d’acquisto di beni e servizi nella sanità della Regione Emilia Romagna (T. Di Grezia). – Bibliografia
CNSL: From Waste of the Cashew Agro-Industry to precious renewable resource for bio-based fine chemicals and new materials
No full textThe new millennium is marked by a growing search for renewable fuels and alternative raw materials from biomass in the petrochemicals industry. Thus, the preparation of fine chemicals and innovative materials from natural and renewable resources is an attractive topic for academic and industrial research especially when the purpose is to recycle huge amount of agro-industrial wastes.
Cashew nut shell liquid (CNSL), well known by-product from the cashew industry rich in natural phenols, is widely produced in many countries (Africa, Brazil, India). Cardanol, obtained as the main product by vacuum distillation of the CNSL, has been used for the preparation of fine chemicals and hybrid materials [1, 2]. In the last years, different classes of compounds, such for example porphyrins, phthalocyanines, fullerenes cardanol based and others fine chemicals, have been synthesized from selected components of CNSL through environmentally sustainable strategies [1-5]. Moreover, innovative composites and hybrid cardanol based compounds have been used to design eco-friendly functional materials and processes [6-9].
References: 1) Mele G., Vasapollo G. (2008) Mini-Rev. Org. Chem. 5, 243. 2) Mazzetto S.E, Lomonaco, Mele G. (2009) Quim. Nova, 32, 732. 3) Attanasi O.A., Mele G., Filippone P., Mazzetto S.E., Vasapollo G. (2009) Arkivoc VIII, 69. 4) Mele G., Li J., Margapoti E., Martina F., Vasapollo G. (2009) Catalysis Today 140, 37. 5) Guo Y.C., Mele G., Martina F., Margapoti E., Vasapollo G., Xiao W.J. (2006) J. Organomet. Chem. 691, 5383-5390. 6) Calò E., Maffezzoli A., Mele G., Martina F., Mazzetto S.E., Tarzia A., Stifani C. (2007) Green Chemistry 9, 754. 7) D’Amico D., Martina F., Ingrosso G., Mele G., Maffezzoli A., Tarzia A., Stifani C. (2009) Int. J. Mat. Prod. Tech. 36, 155. 8) Mele G., Del Sole R., Vasapollo G., Garcìa-Lòpez E., Palmisano L., Mazzetto S.E., Attanasi O.A., Filippone P. (2004). Green Chemistry 6 (102) 604. 9) Lomonaco D., Pinheiro Santiago G. M., Silva Ferreira Y., Campos Arriaga A. M, Mazzetto S.E., Mele G., Vasapollo G. (2009) Green Chemistry 11, 31
New TiO2 based photocatalysts for the degradation of organic pollutants in water
No full textIn the last years a new category of TiO2 based composites prepared by impregnation of bare polycrystalline TiO2 powders with different sensitizers (i.e. phthalocyanines, porphyrins) permitted the improvement of the photocatalytic degradation of 4-nitrophenol (4-NP) under UV1-3 as well as under visible light irradiation.4 On the other hand growing interest devoted to the photodegradation of organic pollutants in water solutions by means of economically advantageous and environmental friendly processes are regarding this topic.
Continuing our research in this area, we report here our recent results concerning: i) the preparation of new TiO2 and TiO2 based photocatalysts containing Fe and Cu species; ii) improvement of the photodegradation processes and conditions.
1. Mele, G.; Del Sole, R.; Vasapollo, G.; García-López, E.; Palmisano, L.; Schiavello, M. J. Catal. 2003, 217, 334. 2. Mele, G. ; Del Sole, R.; Vasapollo, G.; Marcì, G.; Garcìa-Lòpez, E.; Palmisano, L.; Coronado, J. M.; Hernández-Alonso, M. D.; Malitesta, C.; Guascito, R. J. Phys Chem. B 2005, 109, 12347. 3. Mele, G.; García-López, E.; Palmisano, L.; Dyrda, G.; Słota, R. J. Phys. Chem. C, 2007, 111, 6581. 4. Wang, C.; Li, J.; Mele, G.; Yang, G. M.; Zhang, F. X.; Palmisano, L.; Vasapollo, G. Appl. Catal. B: Environ. 2007, 76, 218
Santa Maria della Passione fra misura e forma
No full textL???analisi metrica della chiesa ed in particolare della tribuna ha permesso di chiarire alcuni dubbi circa l???ideazione del progetto. La ricerca mostra un progetto unitario di chiesa a pianta composita e non una pianta centrale che successivamente viene modificata in una pianta composit
Tracciabilità geografica e di processo dei prodotti lattiero-caseari: metodi analitici e risultati della ricerca
No full textLa qualità delle mele in diversi ambienti: pianura, collina e montagna
No full textLa qualità delle mele in diversi ambient
Mele Red Delicious: la qualità dipende dalla conservazione
No full textDalla prova svolta su mele raccolte a Mezzolombardo nel 2018 si evidenzia che la combinazione dell’impiego di gas 1-Metilciclopropene (1-MCP) sulle mele raccolte e la DCA (Dynamic Controlled Atmosphere) in cella di conservazione consente di attendere qualche giorno in più nella raccolta, con importanti benefici in termini di qualità, senza compromettere la conservabilità del prodotto, e inoltre consente un allungamento della vita del prodotto, riducendo in modo evidente la presenza di riscaldo a fine conservazion
Studio del comportamento della "patina bianca" su mele in conservazione
No full textLo studio ha auto lo scopo di approfondire le conoscenze sul comportamento di Tilletiopsis
spp., quale agente dell’alterazione dei frutti di melo nota come “patina bianca”, in condizioni
di conservazione. La prova è stata svolta tra il 2018 e 2019 in celle frigorifere ad atmosfera
controllata. Plateau di mele sane (controllo) e plateau con mele affette da un diverso grado di
attacco di Tilletiopsis spp. sono stati impilati in maniera alternata in cella. Durante i mesi di
conservazione si è seguita l’evoluzione del patogeno sull’epicarpo dei frutti. Dai risultati
emersi non si è evidenziata, nelle condizioni saggiate, alcuna significativa intensificazione del
sintomo in quanto le mele hanno mantenuto lo stesso grado di infezione osservato alla
raccolta. E’ stata altresì verificata la capacità di diffusione del patogeno da mele infette a mele
sane ed anche in questo caso non è stato riscontrato l’instaurarsi di nuovi sintomi sui frutti.
Nel corso delle indagini, sui frutti colpiti da Tilletiopsis spp., è stata osservata una
colonizzazione di aspetto fuligginoso della superficie del frutto da parte di complessi fungini
associabili alle fumaggini. La loro identificazione ha evidenziato in via preliminare
l’appartenenza perlopiù ai generi Alternaria, Cladosporium, Aureobasidium ed altri miceti la
cui identificazione è ancora in corso
Experimental study with complete stress state interpretation of undrained monotonic and cyclic simple shear tests with flexible boundaries
No full textIn many geotechnical problems, the stress state may be approximated by a simple shear stress state. Owing to that, simple shear tests, in which the principal axes of stresses and strains are free to rotate, should be preferred to investigate the soil mechanical behaviour. However, the most common simple shear devices (rigid boundaries) do not allow to completely know the stress state of the specimen. Therefore, the interpretation of this test type has always been developed only theoretically. In order to improve the basic understanding of simple shear stress paths, a more innovative simple shear device with flexible boundaries was used in this research. The specimen is enclosed with an unreinforced membrane and confined by cell pressure. The diameter is kept constant through a sophisticated control system, which well approximates a
K0 condition. The undrained monotonic and cyclic simple shear tests on an Italian sand are presented and discussed. Based on some hypotheses, the stress state is reasonably determined and represented by Mohr’s circles. The theoretical interpretations show that the soil failure—under monotonic and cyclic loading—is reached when the effective intermediate principal stress is midway between the major and minor principal effective stresses (b = 0.5; h = 0), while the principal stress directions tend to reach a slope of 45 . Finally, the mechanical response of the tested sand is compared with the results of triaxial tests from a static and cyclic point of view. In agreement with several results reported in the literature, the friction angle in critical state conditions is higher in simple shear tests compared to that achieved in triaxial tests due to the
rotation of principal stress directions. Moreover, the results of cyclic simple shear tests, in terms of liquefaction resistance (CRR15 & 0.13), are consistent with those performed in cyclic triaxial conditions
A Combined Experimental and Theoretical Study on the Stereodynamics of Monoaza[5]helicenes: Solvent-Induced Increase of the Enantiomerization Barrier in 1-Aza-[5]helicene
No full textHelicenes and heterohelicenes are attractive compounds with great potential in materials sciences to be used in optoelectronics as ligand backbones in enantioselective catalysis and as chiral sensors.[1] Synthetic protocols were developed to obtain helicenes with skeletons consisting of ortho-fused benzene rings or analogue structures incorporating a heteroatom, as in thiophene-, furane-, or pyridine-containing helicenes.[2] In recent years, a repertoire of synthetic strategies was developed to access all monoaza[5]helicenes as well as some diaza[ 5]helicenes.[3] The properties of these materials are related to the stereodynamics of these helical chiral compounds. By exploration of the unexpected broad range of physicochemical properties of aza[n]helicenes it was realized that there is an opportunity to modulate a specific property by controlled design of the position of the N atoms in the helical molecular frame. In this contribution, we show a complete stereodynamic characterization of monoaza[5]-helicenes combining enantioselective dynamic HPLC and DFT calculations. At variance with previous theoretical calculations[4], 1-aza[5]helicene shows a surprisingly high enantiomerization barrier, which is triggered by specific solvent interactions. [5]
References
[1] a) H. A. Staab, M. A. Zirnstein, C. Krieger, Angew. Chem. Int. Ed. Engl. 1989, 28, 86–88; Angew. Chem. 1989, 101, 73– 75;b) T. R. Kelly, Acc. Chem. Res. 2001, 34, 514 –522; c) T. J. Wigglesworth, D. Sud, T. B. Norsten, V. S. Lekhi, N. R. Branda, J. Am. Chem. Soc. 2005, 127, 7272 – 7273; d) L. Vyklicky ́, S. H. Eichhorn, T. J. Katz, Chem. Mater. 2003, 15, 3594 –3601; e) M. Gingras, Chem. Soc. Rev. 2013, 42, 1051– 1095.
[2] a) M. Gingras, Chem. Soc. Rev. 2013, 42, 968–1006; b) M. Gingras, G. F_lix, R. Peresutti, Chem. Soc. Rev. 2013, 42, 1007 –1050; c) Y. Shen, C.-F. Chen, Chem. Rev. 2012, 112, 1463– 1535.
[3] a) C. Bazzini, S. Brovelli, T. Caronna, C. Gambarotti, M. Giannone, P. Macchi, F. Meinardi, A. Mele, W. Panzeri, F. Recupero, A. Sironi, Eur. J. Org. Chem. 2005, 1247 – 1257; b) S. Abbate, C. Bazzini, T. Caronna, F. Fontana, C. Gambarotti, F. Gangemi, G. Longhi, A. Mele, I. Natali Sora, W. Panzeri, Tetrahedron 2006, 62,139 –148; c) T. Caronna, F. Fontana, A. Mele, I. Natali Sora, W. Panzeri, L. Vigan_, Synthesis 2008, 413– 416; d) T. Caronna, S. Gabbiadini, A. Mele, F. Recupero, Helv. Chim. Acta 2002, 85, 1 –8; e) T. Caronna, F. Castiglione, F. Fontana, D. Mendola, I. Natali Sora, Molecules 2012, 17, 463 –479.
[4] S. Abbate, C. Bazzini, T. Caronna, F. Fontana, F. Gangemi, F. Lebon, G. Longhi, A. Mele, I. Natali Sora, Inorg. Chim. Acta 2007, 360, 908 –912.
[5] T. Caronna, A. Mele, A. Famulari, D. Mendola, F. Fontana, M. Juza, M. Kamuf, K. Zawatzky, and O. Trapp, Chem. Eur. J. 2015, 21, 1–7
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