1,048 research outputs found
Competition between hydrogen bonding and arene-perfluoroarene stacking : X-Ray diffraction and molecular simulation on 5,6,7,8-tetrafluoro-2-naphthoic acid and 5,6,7,8-tetrafluoro-2-naphthamide
No full textSingle crystal X-ray diffraction and PIXEL calculation of intermolecular pair energies, with partitioning into coulombic and dispersive factors, have been performed on the title crystals with the aim of testing the relative efficiency of molecular recognition synthons. X-Ray diffraction reveals that the crystals contain extended hydrogen-bonded layers, with various degrees of aromatic ring overlap between the layers. The calculation of molecular pair energies quantitatively reveals that the primary binding force in these crystals is hydrogen bonding, and that the arene-perfluoroarene stacking mode becomes less important, or almost optional. The various degrees of offset between overlapping aromatic rings found in the present crystals, also in comparison with some non-hydrogen bonding analogs, suggest a transition from perfect, highly stabilizing Ar H-Ar F overlap, to the less favourable, but still energetically stabilizing, Ar F-Ar F and Ar H-Ar H overlaps. The selectivity towards Ar H-Ar F stacking is not overwhelming
Structures of two encapsulated cobalt(III) complexes containing cyclo-triphosphate
No full textThe conformational and packing properties of two encapsulated cobalt(III) complexes containing cyclo-triphosphate have been investigated. Compound (I), (1,3,6,8,10,13,16,19-octaazabicyclo[6.6.6]icosane)cobalt(III) cyclo-triphosphate-water (2/7) has the trivial name cobalt(III) sepulchrate cyclo-triphosphate-water (2/7) and chemical formula [Co(sep)](P3O9).3.5H(2)O. The cation shows an lel(3) geometry very similar to those found in other sepulchrate complexes. The packing motif is given by one-dimensional chains of alternating cations and anions running along the z direction and cross-linked by hydrogen-bonded water molecules. Compound (II) is [tris(aminoethylaminomethyl)amine]tris(ethylenediamine)dicobalt(III) di(cyclo-triphosphate) octahydrate, and has the chemical formula [Co(sep')(P3O9)][Co(sep')(0.72)(en(3))(0.28)(P3O9)].8H(2)O (where sep' = C9H27N7). Pseudotranslational symmetry is found, perturbed by the substitutional disorder sep'/en(3). B-centering is therefore simulated involving the anions and water molecules. The crystal packing is similar to that found for compound (I), but the regularity of the chains is broken by the disorder
I luoghi di cibo nell’arte. Spunti di riflessione su cucine e utensili nell’iconografia italiana fra medioevo ed età moderna
No full textLo studio della natura morta e degli ambienti domestici, in particolare quello della cucina, è fortemente presente nell'archivio fotografico di Federico Zeri, a testimonianza della predilezione per questo tema da parte del grande storico dell'arte. L'attenzione di Zeri verso tale genere pittorico negli artisti italiani, attivi fra la fine del medioevo e l'età moderna, unisce all'interesse dello specialista, quello dell'acuto osservatore degli spazi destinati alla conservazione (cantine), alla preparazione e consumo del cibo (cucine). Il genere Natura morta fornisce in proposito significativi dettagli di vita materiale delle epoche passate, la cui rappresentazione permette spesso di interpretare correttamente la documentazione scritta coeva
Ignazio e Filippo Collino, Cleopatra
No full textIl testo presenta un'opera inedita dello scultore Ignazio Collin
Luca Signorelli: un nuovo frammento della pala di Matelica
No full textIl riconoscimento della mano di Luca Signorelli in una tavola raffigurante la testa di Cristo (appartenente alle collezioni dell'IRI) consente di portare un ulteriore tassello alla ricostruzione di una delle pale eseguite dall'artista per Matelica
Pelvic lymphadenectomy in endometrial cancer: our current experience.
No full textEur J Gynaecol Oncol. 2009;30(5):536-8.
Pelvic lymphadenectomy in endometrial cancer: our current experience.
Patrelli TS, Berretta R, Rolla M, Vandi F, Capobianco G, Gramellini D, Bacchi Modena A, Nardelli GB.
SourceDepartment of Gynecology, Obstetrics and Neonatology, University of Parma, Italy. [email protected]
Abstract
OBJECTIVE: Lymph node involvement is the single most important factor in the prognosis of endometrial cancer, because it is predictive of locoregional and distant metastases. The purpose of our study was to determine whether lymphadenectomy is useful in the surgical staging of endometrial cancer and if it may help establish a more accurate prognosis and reduce the need for postoperative therapy in patients without surgical complications.
STUDY DESIGN: We conducted a retrospective study on 55 patients with diagnosis of endometrial cancer.
RESULTS: Surgical staging of patients undergoing pelvic lymphadenectomy (47/55) showed that 59.6% of cases (n = 28) had Stage I cancer (IA in 4, IB in 16, IC in 8), 17.02% (n = 8) Stage II (IIA in 3, IIB in 5), 21.2% (n = 10) Stage III (IIIB in 5, IIIC in 5), and 2.1% (n = 1) Stage IVA. In the remaining eight patients with a very high anesthesiologic risk (ASA 4), surgical staging was incomplete because they underwent only node palpation.
CONCLUSION: In conclusion, as we wait for the sentinel lymph node technique to demonstrate satisfactory results and be standardized also for endometrial cancer, we believe that surgical lymph node dissection plays a crucial role in debulking this type of cancer. When performed by a good surgical oncology team, it does not entail a significantly increased operative risk
Coordination of cyclo-Ocatsulfur and cyclo-Heptaselenium to Dinuclear Rhenium(I) Systems
No full textI luoghi di cibo nell’arte. Spunti di riflessione su cucine e utensili nell’iconografia italiana fra medioevo ed età moderna
No full textLo studio della natura morta e degli ambienti domestici, in particolare quello della cucina, è fortemente presente nell'archivio fotografico di Federico Zeri, a testimonianza della predilezione per questo tema da parte del grande storico dell'arte. L'attenzione di Zeri verso tale genere pittorico negli artisti italiani, attivi fra la fine del medioevo e l'età moderna, unisce all'interesse dello specialista, quello dell'acuto osservatore degli spazi destinati alla conservazione (cantine), alla preparazione e consumo del cibo (cucine). Il genere Natura morta fornisce in proposito significativi dettagli di vita materiale delle epoche passate, la cui rappresentazione permette spesso di interpretare correttamente la documentazione scritta coeva
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