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1
Unprecedented Tris-Phosphido-Bridged Triangular Clusters with 42 Valence Electrons. Chemical, Electrochemical and Computational Studies of their Formation and Stability

Funaioli, Tiziana,Leoni, Piero,Marchetti, Lorella,Albinati, Alberto,Rizzato, Silvia,Fabrizi de Biani, Fabrizia,Ienco, Andrea,Manca, Gabriele,Mealli, Carlo American Chemical Society 2013 Inorganic Chemistry Vol.52 No.8
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This paper presents the synthesis and structural characterization of the unprecedented tris-phosphido-bridged compounds Pt3(μ-PBut2)3X3 (X = Cl, Br, I), having only 42 valence electrons, while up to now analogous clusters typically have 44e–. The new species were obtained by an apparent bielectronic oxidation of the 44e– monohalides Pt3(μ-PBut2)3(CO)2X with the corresponding dihalogen X2. Their X-ray structures are close to the D3h symmetry, similarly to the 44e– analogues with three terminal carbonyl ligands. The products were also obtained by electrochemical oxidation of the same monohalides in the presence of the corresponding halide. In a detailed study on the formation of Pt3(μ-PBut2)3I3, the redox potentials indicated that I2 can only perform the first monoelectronic oxidation but is unsuited for the second one. Accordingly, the 43e– intermediate [Pt3(μ-PBut2)3(CO)2I]+ was ascertained to play a key role. Another piece of information is that, together with the fully oxidized product Pt3(μ-PBut2)3I3, the transient 44e– species [Pt3(μ-PBut2)3(CO)3]+ is formed in the early steps of the reaction. In order to extract detailed information on the formation pathway, involving both terminal ligand substitutions and electron transfer processes, a DFT investigation has been performed and all the possible intermediates have been defined together with their associated energy costs. The profile highlights many important aspects, such as the formation of an appropriate couple of 43e– intermediates having different sets of terminal coligands, and suitable redox potentials for the transfer of one electron. Optimizations of 45e– associative intermediates in the ligand substitution reactions indicate their possible involvement in the redox process with reduction of the overall energy cost. Finally, according to MO arguments, the unique stability of the 42e– phosphido-bridged Pt3 clusters can be attributed to the simultaneous presence of three terminal halides.This paper presents the synthesis and structural characterization of the unprecedented tris-phosphido-bridged compounds Pt3(μ-PBut2)3X3 (X = Cl, Br, I), having only 42 valence electrons, while up to now analogous clusters typically have 44e−. The new species were obtained by an apparent bielectronic oxidation of the 44e− monohalides Pt3(μ-PBut2)3(CO)2X with the corresponding dihalogen X2. According to MO arguments, the unique stability of the 42e− phosphido-bridged Pt3 clusters can be attributed to the simultaneous presence of three terminal halides.Graphic Abstract <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/inocaj/2013/inocaj.2013.52.issue-8/ic400251y/production/images/medium/ic-2013-00251y_0014.gif'><A href='http://pubs.acs.org/doi/suppl/10.1021/ic400251y'>ACS Electronic Supporting Info</A>
2
Evaluation of Four Marker Systems (SSRs, AFLPs, SRAPs and SNPs) for Tomato Germplasm Fingerprinting

Juan J. Ruiz,Marta Garcia-Gusano,Santiago Garcia-Martinez,Lorella Andreani,Filippo Geuna 한국원예학회 2006 한국원예학회 기타간행물 Vol.- No.-
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3
Autophagy-related protein LC3 and Beclin-1 in the first trimester of pregnancy

Chifenti, Barbara,Locci, Maria Teresa,Lazzeri, Gloria,Guagnozzi, Mariangela,Dinucci, Dino,Chiellini, Federica,Filice, Maria Elena,Salerno, Maria Giovanna,Battini, Lorella The Korean Society for Reproductive Medicine 2013 Clinical and Experimental Reproductive Medicine Vol.40 No.1
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Autophagy is a degradation process that acts in response to environmental stressors. Recently, autophagy has been detected in normal term, preeclamptic and intrauterine growth-restricted placentas. The object of this work was to investigate the presence of autophagy in first trimester voluntary interruption of pregnancy placental villi by the expression of autophagy-related proteins, light chain 3 (LC3), and Beclin-1. In first trimester placental villi laser scanning confocal microscopy (LSCM) analysis revealed LC3 and Beclin-1 immunoreactivity prevalently located in villous cytotrophoblasts. Using LSCM, LC3, and Beclin-1 were localized to the cytoplasm of the trophoblast layer in human full-term placentas. Beclin-1 expression and LC3 activation were confirmed by western blotting. These data emphasize that autophagy activation is different among cytotrophoblasts and syncytiotrophoblasts depending on the gestational age and thus we speculate that autophagy might play a prosurvival role throughout human pregnancy.