Search results for " PRIN"

Ordered networks of rat hippocampal neurons attached to silicon oxide surfaces.

2001

The control of neuronal cell position and outgrowth is of fundamental interest in the development of applications ranging from cellular biosensors to tissue engineering. We have produced rectangular networks of functional rat hippocampal neurons on silicon oxide surfaces. Attachment and network formation of neurons was guided by a geometrical grid pattern of the adhesion peptide PA22-2 which matches in sequence a part of the A-chain of laminin. PA22-2 was applied by contact printing onto the functionalised silicon oxide surface and was immobilised by hetero-bifunctional cross-linking with sulfo-GMBS. Geometric pattern matching was achieved by microcontact printing using a polydimethylsiloxa…

Spot compliant neuronal networks by structure optimized micro-contact printing

2001

Neuronal cell growth in vitro can be controlled with micropatterned structures of extracellular matrix proteins such as laminin. This technique is a powerful tool for studying neuronal cell function in order to increase experimental reproducibility and to specifically design innovative experimental setups. In this paper the correlation between the structural dimensions of the ECM pattern and the shape of the resulting cellular network is analyzed. The aim of the present study was to position neuronal cell bodies as precisely as possible and to induce directed cell differentiation. PCC7-MzN cells were cultured on laminin patterns. The line width, node size and gap size in-between cell adhesi…

The first excited singlet state of s‐tetrazine: A theoretical analysis of some outstanding questions

1996

The equation‐of‐motion coupled cluster method for excited electronic states (EOMEE‐CC) is applied to study the structure and selected properties of the first excited singlet state of s‐tetrazine. Adiabatic S1←S0 excitation energies obtained with large basis sets containing up to 270 functions are uniformly somewhat above the experimental 0–0 value of 2.238 eV, but nevertheless are the most accurate calculations reported to date for this quantity. The equilibrium geometry of S1 predicted in this study is in excellent agreement with another high‐level calculation, and moreover is quantitatively consistent with both the intensity of vibrational progressions observed in absorption and measured …

Size Dependence of Tracer Diffusion in Supercooled Liquids

1996

We have determined by forced Rayleigh scattering the diffusion coefficients D of several photochromic tracers with van der Waals radii between 0.38 and 8 nm (the largest ones being photolabeled polystyrene micronetworks) in 10 glass-forming liquids at temperatures between the glass temperature Tg and ∼1.2Tg. The results were analyzed in terms of power law plots, D(T) ∝ T/η(T)ξ, where η is the solvent shear viscosity, and temperature shifts, D(T) ∝ T/η(T + ΔT). The shift ΔT was related with the width of the rotational correlation time distribution via the time−temperature superposition principle.

On the measurement of bubble size distribution in gas–liquid contactors via light sheet and image analysis

2010

Abstract Particle image velocimetry techniques coupled with advanced image processing tools are receiving an increasing interest for measuring flow quantities and local bubble-size distributions in gas–liquid mechanically agitated vessels. When trying to analyze image information the problem arises that bubble sizes are generally underestimated, due to the fact that the laser sheet used for lighting the system randomly cuts bubbles over non-diametrical planes, leading to an apparent bubble size distribution even in the ideal case of single sized bubbles. Clearly in the case of bubbles with a size distribution the experimental information obtained is affected by the superposition of effects.…

Visible-light driven oxidation of gaseous aliphatic alcohols to the corresponding carbonyls via TiO2 sensitized by a perylene derivative

2013

Sensitized P25 TiO2 was prepared by wet impregnation with a home-prepared perylene dye, i.e., N,N?-bis(2-(1- piperazino)ethyl)-3,4,9,10-perylene-tetracarboxylic acid diimide dichloride (PZPER). Energy levels of PZPER were found to be compatible with those of TiO2 allowing fast electron transfer. The obtained catalyst has been characterized and used in the gas-phase partial oxidation of aliphatic primary and secondary alcohols, i.e., methanol, ethanol, and 2- propanol. The reaction was carried out under cut-off (?> 400 nm) simulated solar radiation in O2 atmosphere. The perylene derivative allowed a good absorbance of visible radiation thanks to its low optical energy gap (2.6 eV) which was …

Statistical characterisation of heavy metal contents inParacentrotus lividusfrom Mediterranean Sea

2014

This work focuses on the estimation of Hg, As, Cr, Ni, Cu, V, Cd and Pb by inductively coupled plasma mass spectrometry in 135 adult specimens of Paracentrotus lividus collected in different coastal areas of Sicily (Gela, Punta Secca, Ragusa (RG), Siracusa, Priolo, Catania, Messina, Milazzo, Brolo and Filicudi), in order to monitor the Mediterranean marine ecosystem by use of sea urchin as bioindicator. Moreover, the paper deals with the statistical classification of the tested samples according to the sampling area based on metal concentrations. The descriptive statistics findings were obtained and, a starting multivariate matrix was built. Data-sets were subjected to Kruskal-Wallis test t…

A gallery of Chua's Attractors - Part IV

2007

Ridisegnare il confine fra "noi" e "loro": interrogativi sulla revoca della cittadinaza

2019

Esiste un limite costituzionale alla privazione della cittadinanza? Il decreto legge n. 113/2018 ha recentemente introdotto un nuovo articolo 10-bis nella legge n. 91/1992 che disciplina la revoca della cittadinanza. Si tratta di una “sanzione” che può essere inflitta dal Presidente della Repubblica su proposta del Ministro dell’interno entro tre anni dalla condanna definitiva per gravi fatti di reato ed è applicabile soltanto ad alcune categorie di cittadini (non si può revocare la cittadinanza ai cittadini iure sanguinis, per beneficio di legge o per adozione). La revoca della cittadinanza è una assoluta novità nella legislazione italiana a far data dalle leggi fasciste del 1926 e sembra …

No labas ticības principa izrietošie līguma blakuspienākumi

2022

Civillikuma 1.pants noteic, ka: “Tiesības izlietojamas un pienākumi pildāmi pēc labas ticības”. Desmitiem tūkstošu spriedumu, kuros ietvertas atsauces uz šo pantu liecina par tā plašo atpazīstamību, tomēr gan tiesu praksē, gan tiesību doktrīnā joprojām pastāv neskaidrības par šī panta nozīmi. Autors analizēs un sniegs argumentētas atbildes uz šādiem problēmjautājumiem: 1) vai Civillikuma 1.pants ir uzskatāms tikai par rakstītu tiesību normu, vai arī tas ir nerakstītas tiesību normas atspoguļojums; 2) vai šajā pantā aprakstītais princips ir attiecināms tikai uz civiltiesībām; 3) kāds ir šī principa saturs, kodols, vēsturiskā attīstība, un kāda ir tā izpratne citu valstu tiesībās; 4) kādi ir …