118,329 research outputs found
Abbone di Saint-Germain. L'assedio di Parigi, a cura di D. Manzoli
No full textSaggio critico, con prima traduzione in italiano, commento e testo latino a fronte, sui "Bella Parisiacae urbis", poemetto latino, tra i primi e i più significativi esempi di epica mediolatina, con il quale Abbone di Saint-Germain, testimone dei fatti, racconta l'assedio posto dai vichinghi a Parigi tra l'885 e l'889
Nuclear inositides: PI-PLC signaling in cell growth, differentiation and pathology
No full textThe existence of phospholipids in chromosomes has been suggested by the work of La Cour et al.
(1958). In the 1970s, Manzoli and colleagues demonstrated that addition of phospholipids to purified
nuclei could influence in vitro transcription (Manzoli et al., 1978). The same group demonstrated that
negatively charged lipids led to chromatin decondensation, while positive charged lipids had the
opposite effect. In 1987, the first demonstration came from a work by Cocco et al., that a nuclear PI
metabolism exists and it is regulated during Friend cells differentiation (Cocco et al., 1987). Since then,
progress has been made on the regulation of nuclear phosphoinositides (PI), as well as their role in
cellular functions, i.e. growth and differentiation. Nevertheless, much still needs to be understood
about the function, regulation and physical properties of this nuclear component. For example, while it
is clear that these PIs are not part of the nuclear envelope but they reside within the nuclear domains,
the physicochemical form of nuclear lipids still needs to be clarified (Irvine, 2006).
We know that inositol lipid signaling molecules are essential components of the extremely
complicated, multistep process that allows one extracellular signal to be transduced inside the cell, to
the nucleus. In the nuclear compartment, lipid second messengers elicit reactions that regulate gene
transcription, DNA replication or repair, and DNA cleavage, eventually resulting in cellular differentiation,
proliferation, apoptosis and other cell functions. Inositol-containing phospholipids are the most
intensively studied lipid second messengers. Albeit most of the research on signal transduction
pathways based on PI has been devoted to phenomena that take place at the cell periphery and plasma
membrane, it has become clear that the nuclear PI cycle is regulated in a totally independent manner
from that at the plasma membrane level. This suggests that nuclear inositol lipids themselves can
modulate nuclear processes, as important as transcription and pre-mRNA splicing, growth, proliferation,
cell cycle regulation and differentiation
Materiali per una pedagogia del cinema come percorso di emancipazione.
No full textIl saggio offre una ricognizione delle impostazioni teoriche più recenti relative alla didattica del cinema, per giungere poi a una ipotesi di integrazione fra queste e le teorie del filosofo francese Jacques Rancière
Performance trade-offs of different rake receivers
No full textIn this paper we determine the effects of different diversity schemes on the behavior of a direct-sequence spread spectrum Rake receiver which operates with random spreading sequences, in a multipath channel with arbitrary power delay profile. Two different receiver architectures, the former employing the L instantaneously strongest paths out of the Nr resolved ones, and the latter simply the L first paths out of the received Nr, are confronted in terms of symbol error probability, when an M-level PSK system is assumed. The analytical approach devised for assessing such comparison gives the symbol error probability in terms of simple elementary integrals, and immediately evidences the influence on system behavior of the number of resolved paths, bandwidth occupancy of the signal and power delay profile, with a remarkably moderate computational effort
Performance of a 3rd Generation Radio Link Control Protocol on a Multicarrier DS-CDMA System
No full textThis work investigates the behavior of a 3 rd Generation Radio Link Control Protocol on the forward link of a Multicarrier DS-CDMA architecture that employs Walsh and Quasi-Orthogonal channelization codes. Protocol performance is analytically assessed, determining the average delay suffered by a data unit transferred over the radio channel. For alternative allocation policies of Walsh and Quasi-Orthogonal codes, the effects on throughput of different transmission qualities and size of protocol data units are evaluated. system design
Fascia A come Andromeda. Lo straordinario caso dei film & media studies secondo ANVUR.
No full textSui criteri di selezione delle riviste di Fascia A nel settore scientifico disciplinare L-Art/06
Multicarrier DS-CDMA performance with different assignment strategies of quasi-orthogonal codes
No full textAlternative code assignment policies for the forward link of a multicarrier DS-CDMA system employing the recently proposed quasi-orthogonal sequences are put forth in this paper. It is demonstrated how different allocation strategies of quasi-orthogonal codes alter the interference level suffered by active units; it is also shown how to shape the rate of interference growth as a function of the number of active users within the reference cell, by implementing some specific code allocation patterns. The performance, in terms of average bit error probability, achieved by various schemes is assessed in a frequency selective fading environment, and the advantages of different solutions highlighted. ©2002 IEEE
Solinas e western: un gioco gramsciano fra industria e ideologia
No full textAnalisi del rapporto fra lo sceneggiatore Franco Solinas e il genere western, nel contesto storico, politico e culturale dell'Italia degli anni Sessanta
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