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273 results on '"Reginato G"'

1. Irrigation schedule on table grapes by stem water potential and vapor pressure deficit allows to optimize Water Use

Author

Gálvez Rodrigo, Callejas R., Reginato G., and Peppi M.C.

Subjects
grape quality, irrigation control, irrigation frequency, Plant culture, SB1-1110
Abstract

This study tested the relationship between stem water potential (ψstem) and vapor pressure deficit (VPD) in order to evaluate its use as reference for irrigation control of table grape (Vitis vinifera) cvs. Thompson Seedless and Redglobe. Two trials were carried out on consecutive seasons. In the first season the treatments consisted of four different irrigation regimes: T1, plants irrigated at 100% of ETc; T2, irrigated until fruit set the same as T1 but after fruit set every other time T1; T3, plants with no irrigation from fruit set to harvest; and T4, plants irrigated at 50% of ETc throughout the growing season. Vines from T1 always showed a higher ψstem for a wide VPD range, therefore the ψstem and VPD relationship was established using T1 vines, obtaining a logarithmic function with a high determination coefficient (R2=0.85). The following season this relationship was used to control irrigation frequency on two table grape cvs. Irrigation started when vines had 20 cm shoots and then the irrigation amount was set to replenish 10% of soil available water. Trial 1 was conducted on cv. Thompson Seedless and consisted of two treatments: T1 plants irrigated to satisfy 100% ETc and T2 plants irrigated according to the previously obtained ψstem-VPD reference line. Trial 2 was established with Redglobe cv. plants using three treatments: T1 plants irrigated to satisfy 100% Etc; T2, plants irrigated the same as T1 but after fruit set every other time T1; and T3, plants irrigated according to the ψstem-VPD reference line previously obtained. Irrigation frequency determined using the ψstem-VPD relationship reduced total water volume compared to T1 on both trials, with no effects on yield or quality, showing the feasibility of using this relationship to control irrigation frequency.

Published
2014
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20. Nuovi complessi macrociclici di Ru(II) con leganti alchinilfosfinici

Author

Di Credico, B., Fabrizi de Biani, F., Gonsalvi, L., Guerri, A., Ienco, A., Laschi, F., Peruzzini, M., Reginato, G., Rossin, A., Zanello, P., Di Credico, B, Fabrizi de Biani, F, Gonsalvi, L, Guerri, A, Ienco, A, Laschi, F, Peruzzini, M, Reginato, G, Rossin, A, and Zanello, P

Subjects
complessi di rutenio, leganti alchilfosfonici
Published
2009

22. Alkylations of Nonstabilized Carbanions

Author

Mordini A., Reginato G., and Zani L.

Subjects
Allylic substitutions, Cross-coupling reactions, Organozinc compounds, CC bond formation, Cuprates, Polar organometallics, Grignard reagents, Nucleophilic substitutions, Organolithium compounds, Alkylations, Carbometalations
Abstract

This chapter provides an overview of the most recent advances in the preparation of polar organometallic compounds (containing alkali metals, magnesium, and zinc), characterized by little if no stabilization, and their reactivity with alkylating agents. After a general introduction on the direct alkylation of alkyl and alkenyl polar organometallics, the chapter focuses on allylation and carbometalation reactions, including diastereo- and enantioselective processes, and finally discusses some of the most updated examples of cross-coupling transformations employing magnesium and zinc organometallics. © 2014 Elsevier Ltd. All rights reserved.

Published
2014
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26. Pyridine carboxylate derivatives as acceptor groups in sensitizers for DSSCs

Author

Calamante, M., Cecconi, B., Franchi, D., Mordini, A., Reginato, G., Zani, L., Taddei, Maurizio, Riccardo Basosi, Adalgisa Sinicropi, Maria Laura Parisi, and Nullf, Nullfabrizi Biani

Abstract

In recent years, metal-free organic sensitizers for dye-sensitized solar cells (DSSC) have been shown to have reached an interesting level of efficiency, while not having all the problems associated with the presence of a metal. Often these sensitizers have a "donor-?-acceptor" (D-?-A) architecture, where the acceptor groups is also involved in the interaction with titanium oxide[1]. In many cases, the acceptor/anchor group is a cyanoacrylate moiety but recently acceptors with different structural features, such as pyridine carboxylate, have been reported[2,3]. In this work, different dyes with a pyridine portion as acceptor group were synthesized and characterized, varying the position of the carboxyl group and the D-? group in the pyridine moiety. The isomers prepared showed significant differences both in absorption/emission spectra and in TiO2 up taking. Significantly insertion of appropriate substituents on the pyridine ring might be possible allowing to tune the optical properties of the dyes. Acknowledgements: We thank Regione Toscana for financial support of the FOTOSENSORG project, Prof. M. Bruzzi, Dr. R. Mori and Dr. A. Baldi, Dipartimento di Ingegneria Industriale, Università di Firenze, for cells efficiency measurements. [1] Hagfeldt, A.; Boschloo, G.; Sun, L.; Kloo, L.; Pettersson, H. Chem. Rev. 2010, 110, 6595. [2] Delcamp, J. H.; Yella, A.; Nazeeruddin, M.K.; Graetzel, M. Chem. Comm. 2012, 48, 2295 [3] Cheng, M.; Yang, X.; Li, J.; Chen. C.; Zhao, J.; Wang, Y.; Sun, L. Chemistry- A Eur. J. 2012, 18, 16196

Published
2013

27. Erratum: Organic chromophores based on a fused bis-thiazole core and their application in dye-sensitized solar cells (European Journal of Organic Chemistry)

Author

Dessi, A., Barozzino Consiglio, G., Calamante, M., Reginato, G., Mordini, A., Peruzzini, M., Taddei, M., Sinicropi, A., Parisi, M. L., Fabrizi De Biani, F., Basosi, R., Mori, R., Spatola, M., Bruzzi, M., and Zani, L.

Subjects
Solar cells, Synthetic methods, Photochemistry, Dyes/pigments, Fused-ring systems, Sensitizers
Published
2013

30. Novel organic dyes for photovoltaic applications

Author

Zani L., Barozzino-Consiglio G., Pedna F., Mordini A., Taddei M., Basosi R., Sinicropi A., and Reginato G.

Abstract

Dye-sensitized solar cells (DSC) recently attracted much attention as promising devices for the conversion of sunlight in electric power.[1] Such cells employ dyes, which act as photosensitizers, together with a suitable inorganic semiconductor, such as TiO2. Historically, the first class of photosensitizers employed in DSC was represented by transition metal complexes, such as the Ru-bipyridyl complex N719.[2] More recently, purely organic sensitizers, not containing any metal atom, have emerged as a cheap and efficient alternative.[3] Such substances are often based on a "donor-?-acceptor" architecture, featuring electron-donating and electron-accepting groups separated by a conjugated spacer. Here, we will present some of the dyes recently prepared in our laboratories, whose general structure (1) is shown in the figure. The synthesis of these compounds will be described together with the results of preliminary experiments conducted on test cells containing the novel sensitizers. [1] Hagfeldt, A.; Boschloo, G.; Sun, L.; Kloo, L.; Pettersson, H. Chem. Rev. 2010, 110, 6595. [2] (a) O'Regan, B.; Grätzel, M. Nature 1991, 353, 737 [3] (a) Mishra, A.; Fisher, M. K. R.; Bäuerle, P. Angew. Chem. Int. Ed. 2009, 48, 2474. (b) Ooyama, Y.; Harima, Y. Eur. J. Org. Chem. 2009, 2903.

Published
2011

33. Gold nanoparticles and organic dyes for BIPV-DSSCs

Author

Mazzoni, M., primary, Ratto, F., additional, Mordini, A., additional, Ienco, A., additional, Zani, L., additional, Lai, S., additional, Calamante, M., additional, Pini, R., additional, Centi, S., additional, and Reginato, G., additional

Published
2015
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