5,400 research outputs found
Group algebras whith symmetric units satisfying a group identity
No full textWe study group algebras FG for which the symmetric units under the natural
involution: g∗ = g−1 satisfy a group identity. For infinite fields F of characteristic ≠ 2, a
classification of torsion groups G whose symmetric units) satisfy a group identity
was given by Giambruno-Sehgal-Valenti. We extend this work to non torsion groups
Intraoperative sentinel node detection by an innovative imaging probe.
No full textIntraoperative sentinel node detection by an innovative imaging probe.
Campisi C, Soluri A, Stella S, Valenti G, Scopinaro F.
SourceInstitute of Biomedical Technologies, National Research Council, Rome. [email protected]
Abstract
Intraoperative tumor detection has been used in many applications, and today the sentinel node technique is a widely employed surgical procedure in breast cancer. Different detector systems are employed but several problems have been reported in clinical practice, in particular the difficulty to accurately detect the sentinel node within the axillary soft tissue. The problem is even greater for abdominal and thoracic tumors. We propose an innovative Imaging Probe (IP) able to visualize on a monitor the primary tumor and secondary lesions if appropriately radiolabeled. The IP can be optimally applied for minimally invasive surgery in breast cancer treatment, and a preliminary experience related to 15 patients and 20 sentinel nodes is reported here. We compared the results obtained with the IP to those obtained with an Anger camera and a traditional scintillation detector, and found them to be very promising. In particular the surgeon's work is greatly facilitated by direct visual guidance instead of a generic acoustic signal.
PMID:12369557[PubMed - indexed for MEDLINE
Group graded algebras and almost polynomial growth
No full textLet F be a field of characteristic 0, G a finite abelian group and A a
G-graded algebra. We prove that A generates a variety of G-graded
algebras of almost polynomial growth if and only if A has the same
graded identities as one of the following algebras:
(1) FCp , the group algebra of a cyclic group of order p, where p
is a prime number and p | |G|;
(2) UTG
2 (F ), the algebra of 2×2 upper triangular matrices over F
endowed with an elementary G-grading;
(3) E, the infinite dimensional Grassmann algebra with trivial Ggrading;
(4) in case 2 | |G|, EZ2 , the Grassmann algebra with canonical Z2-
grading
Dopo la fine delle ville: le campagne dal VI al IX secolo
No full textContenuti: G. P. BROGIOLO, Risultati e prospettive della ricerca archeologica sulle campagne altomedievali italiane; A. AUGENTI, G. DE BRASI, M. FICARA, N. MANCASSOLA, L'Italia senza corti? L'insediamento rurale in Romagna tra VI e IX secolo; S. GELICHI, M. LIMBRENTI, C. NEGRELLI, La transizione dall'Antichità al Medioevo nel territorio dell'antica Regio VIII; F. SAGGIORO, Insediamenti, proprietà ed economie nei territori di pianura tra Adda eAdige (VII-IX secolo); R. TIONE, Tarda Antichità eAlto Medioevo nel Tortonese: primi risultati di una ricerca in corso; F. BULGARELLI, A. FRONDONI, G. MURIALDO, Dinamiche insediative nella Liguria di ponente tra Tardoantico e Altomedioevo; E. VACCARO, Il popolamento rurale tra fine Ve inizi X nella Maremma Grossetana: indagini di superficie tra la valle dell'Alma e la valle dell'Osa; M. VALENTI, La formazione dell'insediamento altomedievale in Toscana. Dallo spessore dei numeri alla costruzione dei modelli; G. VOLPE, Villaggi e insediamento sparso in Italia meridionale fra Tardoantico e Altomedioevo: alcune note; T. LEWIT, Bones in the bathhouse: re-evaluating the notion of "squatter occupation" in 5th-7th century villas; A. CHAVARRlA ARNAU, Dopo la fine delle ville: le campagne ispaniche in epoca visigota (VI- VIII secolo);L. SCHNEIDER, Dynamiques spatiales et transformations de l'habitat en Languedoc méditerranéen durant le haut moyen age (VI-IX s.); C. HANUSSE, Ehabitat rural du ve au xe siècle en Normandie; H. HAMEROW, Anglo-Saxon settlements in a post-Roman landscape; V. LORÉ, Rapporti economici e sociali nelle campagne fra VI e IX secolo: i temi storiografici; J. JARNUT, Dove abitavano le aristocrazie longobarde?; R. FRANCOVICH, C. WICKHAM, Conclusioni
A new approach to modelling the shelf life of Gilthead seabream (Sparus aurata)
No full textA total of 217 Gilthead seabreams were subdivided in four groups, according to four different storage conditions. All fish were evaluated by both Quality Index Method (QIM) and microbiological analysis, sampling skin, gills and flesh, separately. A QIM score predictive system was set by modelling the growth of microflora of skin, gills and flesh and coupling these predictions to each related partial QIM score
(QIMSkin, QIMGills, QIMFlesh). The expression of QIM score as a function of bacterial behaviour was carried out by the employment of two coefficients. The predicted mean bacterial concentrations corresponding to the QIM score at 14 days were always near to Log 8 CFU g^{ -1} in the case of 'S' (skin) and 'G' (gills) series. Moreover, predicted QIM scores were in a good agreement with observed data, reproducing the observed mean time of rejection as well as the bacterial spoilage level (Log 8 CFU g^{ -1}), for all kinds of storage condition
Silicon nanocrystals functionalized with photoactive units for dual-potential electrochemiluminescence
No full textSilicon nanocrystals (SiNCs) have attracted attention due to their unique properties that render them particularly suitable for a high variety of applications, such as electrochemiluminescence (ECL) sensors. However, the electrochemiluminescence of SiNCs has not been investigated in depth so far and the research has been focused on conventional quantum dots composed of toxic or rare materials. Here, we investigate the ECL properties of heterosupramolecular systems based on organic chromophores (diphenylanthracene, DPA) linked to the SiNC's surface. The optical properties of the nanocrystal are affected by the presence of the chromophores; their ECL behaviors are independent of each other, generating hybrid systems characterized by dual-potential electrochemiluminescence. These nanoparticles can be used as single systems with tunable dual-potential emissions; ECL signals can be varied with the type of the attached chromophore
A Simplified Map-Matching Algorithm for Floating Car Data
No full textWe present a simplified map-matching algorithm that could be considered a robust tool to identify the correct path between consecutive GPS traces over a large number of scenarios avoiding ambiguous route assignment consistent with trajectory samples. Our formulation relies on a hidden Markov model (HMM) framework including multiple features such as the travelled distances between consecutive GPS traces, the signal quality and the direction of travel. The accuracy of the algorithm was evaluated using Floating Car Data (FCD) from a large fleet of privately owned cars and commercial vehicles equipped with devices capable of acquiring GPS positions with a sampling period of about 30 s. Experimental results showed an average accuracy of the model of about 85%. Results suggest our model is suitable not only to identify trajectories for specific origins and destinations, but also to extract traffic and travel time patterns
Bradykinin signaling counteracts cAMP-elicited aquaporin 2 translocation in renal cells.
No full textBradykinin (BK) is one of the most important peptides regulating vascular tone, water, and ionic balance in the body, playing a key role in controlling BP. It is interesting that patients with essential hypertension excrete less BK than normotensive individuals. For elucidating the mechanism by which BK regulates renal water transport that contributes to its antihypertensive effect, aquaporin 2 (AQP2)-transfected collecting duct CD8 cells, expressing the BK type II receptor (BK2R), were used as an experimental model. In CD8 cells, BK pretreatment impaired forskolin-induced AQP2 translocation to the apical plasma membrane. For clarifying the signal transduction cascade associated with this effect, whether BK induced an increase in cytosolic calcium, via the G protein Gq, known to be coupled to BK2R, first was investigated. Spectrofluorometry using fura-2-AM revealed that 100 nM BK elicited a significant increase in Ca-i, which was abolished by the receptor antagonist HOE-140. BK acts through BK2R coupled to both Gq and G alpha 13, a known upstream effector of Rho protein. In CD8 cells, BK causes an increase in Rho activity, likely as a result of Ga13 activation. This results in stabilization of the cortical F-actin network, thus impairing AQP2 trafficking. These effects counteract physiologic vasopressin stimulation, which instead has an opposite effect on actin network organization through Rho inactivation
Characterization of sulphation and of hydration-induced reactivation of sorbents in fluidized bed systems (F. Montagnaro's PhD Thesis)
No full textSmartEcoPhone, between research and enterprise. Enhancing the natural and cultural heritage of Rome
No full textHistorical parks and gardens are important stepping-stones for the conservation of the cultural and natural heritage in cities, and deserve a careful management. This can also be achieved when receiving the support from citizens as well as tourists who have to be proactively involved, so as to increase the collective identity. The involvement, in turn, can be facilitated when the information on the cultural and natural heritage is easily and user-friendly accessible, and the communication with the responsible institutions straightforward. To this purpose, an application in English and Italian for smart phones and tablets (both iOS and Android systems) dedicated to the historical parks and gardens of Rome has been developed through a joint venture between public institutions and private enterprises, within the framework of a EU funded project. Through its geo-location system and an interactive discovery tool, the application allows the user to retrieve the information - for a total of over 400 entries with iconographical material - on historical monuments as well as to identify the components (flora and fauna) of the natural heritage. The application can be also used to report to the responsible institutions updated information on problems and the possible degradation of the site. The extension of this system at a national scale, and its potential use to improve the economic sustainability of the management of the historical parks and gardens, is also discussed
- …
