Search results for " assembly."

Self-assembly and intra-cluster reactions of erbium and ytterbium bis(2-ethylhexyl)sulfosuccinates in the gas phase

2014

RATIONALE The study of surfactant organization in vacuum allows surfactant–surfactant interaction to be unveiled in the absence of surrounding solvent molecules. Knowledge on their chemical-physical properties may also lead to the definition of more efficient gas-phase carriers, air-cleaning agents and nanoreactors. In addition, the presence of lanthanide-group ions adds unique photochemical properties to surfactants. METHODS The structural features, stability and fragmentation patterns of charged aggregates formed by lanthanide-functionalized surfactants, ytterbium and erbium bis(2-ethylhexyl)sulfosuccinate ((AOT)3Yb and (AOT)3Er), have been investigated by electrospray ionization mass spe…

Supramolecular Assembly of Metal Complexes by (Aryl)I⋅⋅⋅d[PtII] Halogen Bonds

2020

The theoretical data for the half-lantern complexes [{Pt( CN^ )(μ- SN^ )}2 ] [1-3; CN^ is cyclometalated 2-Ph-benzothiazole; SN^ is 2-SH-pyridine (1), 2-SH-benzoxazole (2), 2-SH-tetrafluorobenzothiazole (3)] indicate that the Pt⋅⋅⋅Pt orbital interaction increases the nucleophilicity of the outer d z2 orbitals to provide assembly with electrophilic species. Complexes 1-3 were co-crystallized with bifunctional halogen bonding (XB) donors to give adducts (1-3)2 ⋅(1,4-diiodotetrafluorobenzene) and infinite polymeric [1⋅1,1'-diiodoperfluorodiphenyl]n . X-ray crystallography revealed that the supramolecular assembly is achieved through (Aryl)I⋅⋅⋅d z2 [PtII ] XBs between iodine σ-holes and lone pa…

Controlling supramolecular polymerization through multicomponent self-assembly

2016

The self-assembly into supramolecular polymers is a process driven by reversible non-covalent interactions between monomers, and gives access to materials applications incorporating mechanical, biological, optical or electronic functionalities. Compared to the achievements in precision polymer synthesis via living and controlled covalent polymerization processes, supramolecular chemists have only just learned how to developed strategies that allow similar control over polymer length, (co)monomer sequence and morphology (random, alternating or blocked ordering). This highlight article discusses the unique opportunities that arise when coassembling multicomponent supramolecular polymers, and …

Indanedione based binary chromophore supramolecular systems as a NLO active polymer composites

2010

Novel route to obtain EO material is proposed by supramolecular assembly of neutral-ground-state (NGS) and zwitterionic (ZWI) NLO chromophores in binary chromophore organic glass (BCOG) host–guest system. On a basis of our Langeven Dynamics (LD) molecular modeling combined with quantum chemical calculations, we have shown that anticipated enhancement NLO efficiency of BCOG material is possible via electrostatic supramolecular assembly of NGS with ZWI chromophore in antiparallel manner. Binding energy of such complex could be more dependent on molecular compatibility of components and local (atomic) charge distribution, then overall molecular dipole moments. According to our LD simulations t…

Recognition-Directed Supramolecular Assemblies of Metal Complexes of Terpyridine Derived Ligands with Self-Complementary Hydrogen Bonding Sites

2000

The synthesis and X-ray structures of three metal complexes with terpyridine-derived ligands that contain amino-pyrimidine and amino-pyrazine moieties are presented. They have been designed in view of directing their self-assembly into specific supramolecular arrays through molecular recognition interactions. The solid-state structures indeed reveal extensive hydrogen-bonded networks. The Co complex 4a with PF6- counterions builds a two-dimensional infinite interwoven grid through strong double hydrogen bonds (d(N-H-N) =2.918-3.018 A) between the amino groups and the N atoms of the rings, with all H-bonding sites saturated. Changing the anions to BF4- in 4b leads to a similar infinite but p…

The United Nations child policy : international games of morality and power

2013

Epigenetic involvement in Hutchinson-Gilford progeria syndrome: a mini-review.

2013

Hutchinson-Gilford progeria syndrome (HGPS) is a rare human genetic disease that leads to a severe premature ageing phenotype, caused by mutations in the <i>LMNA</i> gene. The <i>LMNA</i> gene codes for lamin-A and lamin-C proteins, which are structural components of the nuclear lamina. HGPS is usually caused by a de novo <i>C1824T</i> mutation that leads to the accumulation of a dominant negative form of lamin-A called progerin. Progerin also accumulates physiologically in normal ageing cells as a rare splicing form of lamin-A transcripts. From this perspective, HGPS cells seem to be good candidates for the study of the physiological mechanisms of ageing…

Due democratiche cristiane alla Consulta nazionale: Laura Bianchini e Angela Maria Guidi Cingolani

2022

Questo articolo appartiene a uno studio più ampio che mira a ricostruire una tradizione politica femminile per comprendere alcune delle ragioni persistenti dietro il divario di genere tra accesso formale e sostanziale alle decisioni. L’obiettivo finale è quello di evidenziare il ruolo e il contributo delle donne, soprattutto di quelle che sono finite nell’oblio, nella costituzione di un’Italia democratica e repubblicana fin dalle loro prime partecipazioni all’Assemblea Nazionale Consultiva. L’Archivio della Camera dei Deputati, l’Archivio dell’Istituto Sturzo e gli articoli delle riviste dell’epoca sono state le fonti primarie della ricerca.Il 25 settembre 1945 si inaugura la Consulta che r…

Thermus bacteriophage P23-77 : key member of a novel, but ancient family of viruses from extreme environments

2015

Arsenite-induced aneuploidy following short and long-term exposure in mammalian cells

2009

We studied the long-term progression of chromosomal instability in V79 cells treated acutely with arsenite (10mM, 24 hr) followed by growth in arsenic-free medium for 120 cell generations. Indirect immunostaining using anti-ß-tubulin antibody showed severe alterations in spindle morphology after only 6 h treatment and cytogenetic investigations carried out at the end of treatment revealed that the percentage of cells with 21 chromosomes (modal number of the cell line) decreased, making way for aneuploid cells. The acquired instability remained and propagated within the cell population. Moreover, we treated V79-derived G12 cells with sub-lethal doses (0.1-1.0 μM) of arsenite for 10 days foll…