Search results for "assembly"
showing 10 items of 768 documents
Vittorio Emanuele Orlando. Il giurista, l’avvocato, lo statista
2018
Vittorio Emanuele Orlando is one of the defining figures of the history of Italy. Lawyer, jurist and statesman, he founded the Italian School of Public Law and worked out an original version of the “Rechtsstaat”. He led Italy to victory during the First World War, took then an official stance against the Fascism and played a significant role in the republican constituent process. The article suggests a coherent interpretation of the several aspects of his personality and provides an extensive bibliography
FISIOPATOLOGIA DELLA SINTESI DELLE LIPOPROTEINE INTESTINALI
2015
La sintesi di lipoproteine di origine intestinale è un processo sequenziale, necessario per l’assorbimento dei lipidi e delle vitamine liposolubili di origine alimentare. L’assemblaggio dei chilomicroni inizia nel reticolo endoplasmico con la formazione di particelle ricche di fosfolipidi che sono poi trasportate al Golgi per essere secrete. Diverse classi di trasportatori giocano un ruolo sia nell’assorbimento selettivo che nel trasporto di lipidi attraverso i villi intestinali. Una volta secrete nel circolo linfatico, le lipoproteine ricche di trigliceridi (LRT) sono sottoposte all’azione della Lipasi Lipoproteica (LPL), che catalizza l’idrolisi dei triacilgliceroli delle lipoproteine a d…
Visions and Forms of Democratic Participation in Italian Universities after 1968
2022
The essay focuses on the ideological aspects and organizational dynamics underlying the 1968 protests in Italian universities. It analyses the inter-generational confrontation within the parties and in the wider public sphere in order to explain the new assembly-based organization in the Italian university. Young people in many countries demanded new spaces for a more direct political action; in Italy this would foster a change in the university representatives and parliamentary bodies which had so far mediated student participation. The UNURI (Italian University’s National Representative Union), founded in 1948, would suffer a crisis in 1968 precisely on the thrust of requests from youth i…
Fine-Tuning of the film thickness of ultrathin multilayer films composed of consecutively alternating layers of anionic and cationic polyelectrolytes
2007
We have recently introduced a new method of creating ultrathin films [1–3] based on the electrostatic attraction between opposite charges. Consecutively, alternating adsorption of anionic and cationic polyelectrolytes leads to the formation of multilayer assemblies. Multilayer buildup is easily monitored by small angle x-ray scattering (SAXS). The total thickness of the multilayer assemblies increases linearly with the number of adsorbed layers, indicating a stepwise and regular deposition process. — Here, we report on the fine-tuning of the total film thickness by changing the ionic strength of the solvent from which the polyelectrolytes are adsorbed. When the anionic polyelectrolyte is ad…
Controlled Self-Assembly of Electron Donor Nanotubes
2009
We employ a combination of urea-urea hydrogen bonds and pi-pi stacking interactions to obtain soluble self-assembled nanotubes decorated with electron-donor TTF derivatives on the periphery. We have investigated the structure and stability of the nanotubes with a combination of experiments and high-level DFT calculations. We also demonstrate that the association process can be controlled by changes in the hydrogen-bonding ability of the solvent and electrochemically.
Efficient DNA Packaging of Bacteriophage PRD1 Requires the Unique Vertex Protein P6
2007
ABSTRACT The assembly of bacteriophage PRD1 proceeds via formation of empty procapsids containing an internal lipid membrane, into which the linear double-stranded DNA genome is subsequently packaged. The packaging ATPase P9 and other putative packaging proteins have been shown to be located at a unique vertex of the PRD1 capsid. Here, we describe the isolation and characterization of a suppressor-sensitive PRD1 mutant deficient in the unique vertex protein P6. Protein P6 was found to be an essential part of the PRD1 packaging machinery; its absence leads to greatly reduced packaging efficiency. Lack of P6 was not found to affect particle assembly, because in the P6-deficient mutant infecti…
Stepwise synthesis and selective dimerisation of bis- and trisloop tetra-urea calix[4]arenes.
2008
Tetra-urea calix[4]arenes substituted with four mono- or bisalkenyl residues have been converted into bis- or tetraloop compounds by intramolecular olefin metathesis, with use of a tetratosylurea calix[4]arene as template. The same strategy has now been used to synthesise trisloop compounds and bisloop compounds with adjacent loops, completing the series of the loop-containing tetra-urea derivatives. A tetra-urea calix[4]arene of the AABB type, where A stands for a bisalkenyl- and B for a monoalkenyl-substituted urea unit, was used as precursor for the three loops. It was easily synthesised from a tetraamino calix[4]arene in which two adjacent amino groups were Boc-protected. The ABCB-type …
Surfactant self-assembly in the gas phase: Bis(2-ethylhexyl)sulfosuccinate- alkaline metal ion aggregates
2008
Molecular dynamics (MD) simulations were conducted for systems in vacuo consisting of n AOT anions (bis(2-ethylhexyl)sulfosuccinate ions) and n 1 or n Na+ ions up to n = 20. For n = 15, positively charged systems with Li+, K+, and Cs+ cations were also considered. All systems were observed to form reverse micelle-like aggregates whose centre is occupied by cations and polar heads in a very compact solid-like way, while globally the aggregate has the form of an elongated and rather flat ellipsoid. Various types of statistical analyses were carried out on the systems to enlighten structural and dynamical properties including gyration radius, atomic pair correlation functions, atomic B-factor …
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) 3 Yb and (AOT) 3 Er), have been investigated by electrospray ionization m…
Entrapment of amino acids in gas phase surfactant assemblies: The case of tryptophan confined in positively charged (1R,2S)-dodecyl (2-hydroxy-1-meth…
2017
The ability of positively charged aggregates of the surfactant (1R,2S)‐dodecyl (2‐hydroxy‐1‐methyl‐2‐phenylethyl))dimethylammonium bromide (DMEB) to incorporate D-tryptophan or L-tryptophan in the gas phase has been investigated by electrospray ion mobility mass spectrometry (ESIâIMâMS). Strongly impacted by the pH of the electrosprayed solutions, both protonated (T+) and deprotonated (T-) tryptophan are effectively included into the aggregates, whereas, tryptophan in zwitterionic (T0) form is practically absent in singly charged DMEB aggregates but can be found in multiply charged ones. The ability to incorporate tryptophan increases with the aggregation number and charge state of aggr…