Search results for "ROMA"
showing 10 items of 13919 documents
Mejora en la detección y el tratamiento de datos en técnicas de separación a alta temperatura para la caracterización de poliolefinas
2014
La Tesis Doctoral es una contribución al reconocimiento de la importancia de la caracterización de la interdependencia entre la masa molecular y la composición química en poliolefinas, y del potencial de los detectores de absorción infrarroja (IR) de filtros en este campo. El uso de este tipo de detectores acoplados a la técnica de separación por masas moleculares GPC/SEC (Gel permeation chromatography/Size exclusion chromatography) se ha ido popularizando en los últimos años, al ponerse en valor el tipo de información que proporcionan, y se prevé que la tendencia se acentúe en el futuro, con la extensión de su aplicación como detectores duales de concentración y de composición química en o…
Coulomb excitation of 222Rn
2022
International audience; The nature of quadrupole and octupole collectivity in $^{222}$Rn was investigated by determining the electric-quadrupole (E2) and octupole (E3) matrix elements using subbarrier, multistep Coulomb excitation. The radioactive $^{222}$Rn beam, accelerated to 4.23 MeV/u, was provided by the HIE-ISOLDE facility at CERN. Data were collected in the Miniball $\gamma$ -ray spectrometer following the bombardment of two targets, $^{120}$Sn and $^{60}$Ni. Transition E2 matrix elements within the ground-state and octupole bands were measured up to 10 ¯h and the results were consistent with a constant intrinsic electric-quadrupole moment, 518(11) $e$ fm$^2$ . The values of the int…
Polyoxypregnanes as safe, potent, and specific ABCB1-inhibitory pro-drugs to overcome multidrug resistance in cancer chemotherapy in vitro and in vivo
2021
Multidrug resistance (MDR) mediated by ATP binding cassette subfamily B member 1 (ABCB1) is significantly hindering effective cancer chemotherapy. However, currently, no ABCB1-inhibitory drugs have been approved to treat MDR cancer clinically, mainly due to the inhibitor specificity, toxicity, and drug interactions. Here, we reported that three polyoxypregnanes (POPs) as the most abundant constituents of Marsdenia tenacissima (M. tenacissima) were novel ABCB1-modulatory pro-drugs, which underwent intestinal microbiota-mediated biotransformation in vivo to generate active metabolites. The metabolites at non-toxic concentrations restored chemosensitivity in ABCB1-overexpressing cancer cells v…
Decorated pottery study: Analysis of pigments by x-ray absorbance spectroscopy measurements
2007
Characterization of pigments on decorated pottery fragments has been fully carried out by nondestructive x-ray absorbance spectroscopy (XAS). The samples were a series of pottery shards excavated from the archeological site of Caltagirone (Sicily, Italy), a well-known ceramic production center. Aesthetical criteria and morphological observations allowed us to attribute the samples to quite different historical periods, starting from the 18th century B.C. up to the 16th century A.D. An extensive time interval led us to suppose that different materials and techniques were used for the production of the ceramic paste and also for the preparation of pigments. XAS measurements were performed at …
'Fictio libertatis': rilevanza dei 'debita servorum' all'interno della struttura formulare delle 'actiones adiecticiae qualitatis'
1998
Accretion in strong field gravity with eXTP
2019
In this paper we describe the potential of the enhanced X-ray Timing and Polarimetry (eXTP) mission for studies related to accretion flows in the strong field gravity regime around both stellar-mass and supermassive black-holes. eXTP has the unique capability of using advanced 'spectral-timing-polarimetry' techniques to analyze the rapid variations with three orthogonal diagnostics of the flow and its geometry, yielding unprecedented insight into the inner accreting regions, the effects of strong field gravity on the material within them and the powerful outflows which are driven by the accretion process.
Chromatin remodeling disease: a functional link with poly-ADP-Ribosylation
2009
Construction of a genetically modified wine yeast strain expressing the Aspergillus aculeatus rhaA gene, encoding an -L-Rhamnosidase of enological in…
2003
Monoterpenes such as geraniol, linalool, and -terpineol present in grapes determine the varietal flavor properties of young quality wines made from Muscat varieties (for reviews, see references 19 and 21). Geraniol and linalool are considered to be the most important of the monoterpene alcohols, as they are present in greater concentrations and have lower flavor thresholds than other major wine monoterpenes. In particular, linalool is thought to be responsible for the grapelike aroma of wines produced from the Muscat variety. A large proportion of
Īso ķēžu taukskābju pētījumi bioloģiskajos šķīdumos, izmantojot gāzu hromatogrāfijas metodi
2021
Īso ķēžu taukskābju pētījumi bioloģiskos šķīdumos, izmantojot gāzu hromatogrāfijas metodi. Kapura V., Dr. chem., asoc. prof. Ida Jākobsone, Dr. chem., asoc. prof. Pēteris Mekšs. Maģistra darbs, 52 lappuses, 30 attēli, 10 tabulas, 39 literatūras avoti, 2 pielikumi. Latviešu valodā. Pielāgojot literatūrā aprakstītas metodes, darbā izpētīti gāzu hromatogrāfiskās analīzes apstākļi, lai identificētu īso ķēžu taukskābes bioloģiskos paraugos. Eksperimentālajā daļā noteikta etiķskābes, propionskābes un butānskābes koncentrācija fermentācijas barotnēs ar gāzu hromatogrāfiju, detektēšanai izmantojot liesmas jonizācijas detektoru.
Intrinsic transverse momentum distribution of jet constituents in p-Pb collisions at ALICE
2014
The integral part of the URHIC program is also to study the pp and p–A collision in order to understand the “reference” (unmodified) particle production (in pp) and the “cold” nuclear phenomena in p–A. The main focus of this thesis is to study the parton shower evolution in p–Pb collisions in ALICE by analyzing jet fragmentation transverse momentum (j_{T} ). The analysis of j_{T} in p–Pb collisions, for which ALICE has a high quality data set, lays bases for later extension to pp and Pb–Pb data in order to study the induced gluon radiation. Additionally, the yields of \pi^0 meson were studied in Pb–Pb sqrt(s_{NN}) = 2.76 GeV collision. The \pi^0 analysis was followed for continuity of work …