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21.
S. Piperno L. Lozzi R. Rastelli M. Passacantando S. Santucci 《Applied Surface Science》2006,252(15):5583-5586
Electrospinning is a process by which polymer nanofibers (with submicron scale diameters) can be formed when a droplet of viscoelastic polymer solution is subjected to high voltage electrostatic field. As this droplet travels in air, the solvent evaporates leaving behind a charge fiber that can be electrically deflected on a substrate. A series of nanofibers with various wt.% of PMMA (poly-methyl-methacrylate) to acetone were produced and characterized regarding their morphology and chemical composition. The nanofibers were characterized by Secondary Electron Microscopy, Atomic force microscopy and X-ray photoelectron spectroscopy. 相似文献
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Magnani A Barbucci R Lamponi S Chiumento A Paffetti A Trabalzini L Martelli P Santucci A 《Electrophoresis》2004,25(14):2413-2424
Plasma protein adsorption patterns on surfaces may give vital information to evaluate biocompatibility of biomaterials designed for direct blood-contacting applications or tissue integration. Adsorption of human serum proteins on four different types of biomaterials (glass, aminosilanized glass, hyaluronan and sulfated hyaluronan) was analyzed by two-dimensional electrophoresis. Desorption of proteins from the surfaces was first classically achieved by sodium dodecyl sulfate (SDS) elution. We introduced a second elution step (by use of isoelectric focusing (IEF) sample buffer consisting of urea, 3-[(3-cholamidopropyl)dimethylammonio]-1-propansulfonate, and dithioerythritol) which allows more stringent elution conditions and is a tool to evaluate the protein adsorption strength to biomaterials. Moreover, the two-step elution may discriminate between irreversible and reversible adsorption of plasma proteins for biomaterials, thus helping to elucidate the structure of protein multilayers which form a complex system at the surfaces. The IEF sample buffer proved not to alter the biomaterial structure and integrity. Hydrophobic bonds resulted to be the main strength driving protein adsorption onto our biomaterials. Apolipoproteins were the most important proteins interacting with the surfaces suggesting that high-density lipoprotein (HDL) particles could play a role in biocompatibility due to their beneficial effects on endothelial cells. 相似文献
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We recently studied the protein composition of a Saccharomyces cerevisiae wine yeast strain (K310) of enological interest. About 2,500 spots of 8-250 kDa observed molecular mass were resolved by two-dimensional gel electrophoresis. Experimental molecular masses and isoelectric points were calculated for most of them. Twenty-seven proteins were subjected to Edman microsequencing. N-terminal sequences of 12/27 proteins were determined, whereas internal sequences of 6/27 proteins were obtained following in situ proteolysis. Comparison between the experimental data and those reported in the SWISS-PROT database revealed some differences between genotypic and phenotypic sequences. These are indicative of the changes a protein can undergo with respect to the primary structure coded by the genomic DNA. Our results highlight the need to complement genomic analysis with detailed proteomics in order to refine the vast amount of information provided by DNA sequencing and to find an exact correlation between genome and proteome. 相似文献
27.
Cameron BR Darkes MC Baird IR Skerlj RT Santucci ZL Fricker SP 《Inorganic chemistry》2003,42(13):4102-4108
The preparation of a series of [Ru(III)(tacn)(eta(2)-dtc)(eta(1)-dtc)][PF(6)] (tacn = 1,4,7-triazacyclononane; dtc = dimethyldithiocarbamate, diethyldithiocarbamate, pyrrolidinedithiocarbamate, l-prolinedithiocarbamate, l-prolinemethyl ester dithiocarbamate, l-N-methylisoleucinedithiocarbamate) complexes, 5-11, is described. Complex 5 reacts with NO to form the ruthenium nitrosyl complex 12. A series of [Ru(III)(tacn)(pyc)Cl][PF(6)] (pyc = 2-pyridinecarboxylic acid, 2,4- and 2,6-pyridinecarboxylic acid) complexes, 14-16, were prepared along with [Ru(III)(tacn)(mida)][PF(6)] (mida = N-methyliminodiacetic acid), 13, and [Ru(III)(Hnota)Cl], 17, (Hnota = 1-acetic acid-4,7-bismethylcarboxylate-1,4,7-triazacyclononane). Complexes 5-17 were evaluated for use as NO scavengers in an in vitro assay using RAW264 murine macrophage cells. [Ru(III)(tacn)(eta(2)-dtc)(eta(1)-dtc)][PF(6)] complexes 5-11 are very efficient NO scavengers in this assay. 相似文献
28.
S. Santucci S. Guerrieri M. Passacantando P. Picozzi F. Fam N. Nardi F. Basile 《Journal of Non》2001,280(1-3):54-58
Silicon oxide has been grown by rapid thermal processing. The growth rate, in the range of very thin films (<10 nm), has been studied as a function of the oxidation temperature. Combined films composed by conventional thermal silicon oxide growth over SiO2 passivation layer deposited by rapid thermal processing onto Si(1 0 0) substrates have been used as gate oxide of p-channel metal-oxide semiconductor (p-MOS) transistors of dynamic random access memory (DRAM). The effect of rapid thermal annealing treatments on these films has also been experimented. Improvements in the electrical performances of transistors have been observed. 相似文献
29.
We consider some Nikol'skij-type inequalities, thus inequalities between different metrics of a function, for almost periodic
trigonometric polynomials. Some basic methods of probability theory are applied to prove the existence of the distribution
function for an almost periodic function in the sense of Besicovitch. Finally, the Maximal function of Hardy and Littlewood
is considered and maximal inequalities on Besicovitch spaces are proved.
Received: 23 July 1998 / Revised version: 8 March 1999 相似文献
30.
We study experimentally the slow growth of a single crack in a fibrous material and observe stepwise growth dynamics. We model the material as a lattice where the crack is pinned by elastic traps and grows due to thermally activated stress fluctuations. In agreement with experimental data we find that the distribution of step sizes follows subcritical point statistics with a power law (exponent 3/2) and a stress-dependent exponential cutoff diverging at the critical rupture threshold. 相似文献