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242 results on '"Gheri G"'

55. Characterization of the glycoconjugate sugar residues in developing chick esophageal epithelium

Author

Gheri, G, GHERI BRYK, S, Sgambati, Eleonora, and Gulisano, M.

Subjects
Esophagus, Sugar residues, 6 - Ciencias aplicadas::61 - Medicina::611 - Anatomía [CDU]
Abstract

The development of the esophagus in the chick embryo is characterized by remarkable morphological changes especially at the level of the epithelium. Using horseradish peroxidase-conjugated lectins (DBA, PNA, SBA, WGA, ConA, LTA, UEAI) we have studied, at the level of the esophagus of chick embryos from the 8th to the 21st day of incubation and of 1- and 2-day-old chicken, the evolution of the saccharidic moieties of glycoconjugates, which precedes andlor is concomitant with the epithelial morphological transformations. We have found differences in content and cellular distribution of oligosaccharides during the histogenetic processes which characterize the lining and glandular epithelium. Before the appearance of cilia and mucus secretion at the bathyprismatic epithelial cells, the sugar residues D-galactose-(B 133)-N-acetyl-Dgalactosamine, B-N-acetyl-D-galactosamine and a-Lfucose were detected only at the luminal cell surface. These oligosaccharides were probably involved in giving rise to the polarization of the esophageal epithelial cells. The esophageal gland mucus was first characterized by the presence of a-L-fucose and afterwards also by the presence of D-galactose-(Bl33)-N-acetyl-Dgalactosamine, D-glucosamine and sialic acid.

Published
1993

88. Numerical solution of a λ‐rational Sturm–Liouville problem.

Author

GHELARDONI, P., GHERI, G., and MARLETTA, M.

Subjects
NUMERICAL solutions to Sturm-Liouville equations, NUMERICAL solutions to boundary value problems, EIGENVALUES, NUMERICAL analysis, MATRICES (Mathematics)
Abstract

This paper deals with the numerical solution of a λ‐rational Sturm–Liouville problem using the shooting technique. Some classical procedures (boundary value methods and shooting with the Magnus method) are applied in order to examine their effectiveness in the presence of an eigenvalue embedded in the essential spectrum. It is shown that all these methods experience a degeneration of their order of accuracy: none, regardless of the order it may have on a classical Sturm–Liouville problem, has order greater than 2. Moreover, this situation cannot be rectified by applying the regularizing transformation of Niessen and Zettl. Nevertheless, it is possible to generalize a very efficient correction technique, first suggested by the authors for classical Sturm–Liouville problems, to the present case. [ABSTRACT FROM PUBLISHER]

Published
2003
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89. Riduzione della varianza nei metodi Monte Carlo come problema di ottimizzazione in R.

Author

Gheri, G. and Marzulli, P.

Abstract

In the frame of Monte Carlo methods a tecnique for reducing variance is considered. Generalizing a procedure suggested in a previous work [1], we give a method wich reduces the variance by solving an unconstrained optimization problem. Concerned with the approximate integration, some numerical tests are considered. The described technique is shown to allow more accurate results than some known in literature. [ABSTRACT FROM AUTHOR]

Published
1983
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95. Multimode equivalent network representation of inductive and capacitive multiple posts

Author

Guglielmi, M. and Gheri, G.

Abstract

Novel multimode equivalent network representations for multiple inductive and capacitive posts in rectangular waveguides are presented. The network representations art derived from a rigorous formulation that leads to frequency independent integral equations. The network representations developed are used to compute the response of several waveguide devices, and comparisons between measured and simulated performances are also included, showing very good agreement up to millimetre-wave frequencies.

Published
1995

99. TUBE CHAMBERS FOR THE MUON FILTER OF THE L3 DETECTOR

Author

Bocciolini, M., Caniato, P., Cartacci, A. M., Celletti, F., Ciuffi, F., Civinini, C., D Alessandro, R., Gallo, E., Gheri, G., Giarrizzo, G., Landi, G., Alberto Marchionni, Meschini, M., Monteleoni, B., Pieri, M., Pieri, V., Ricci, C., Simonetti, G., Spillantini, P., and Wang, Y. F.

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