175 research outputs found
Secondary hemophagocytic lymphohistiocytosis possibly induced by interferon beta-1a therapy.
No full textThe effects of vegetarian diets on bone health: a literature review
No full textIn these recent years many people are adopting a vegetarian type diet due to the numerous positive health effects of this regimen such as the reduction of the incidence of many chronic disorders like diabetes, hypertension, obesity and cancer. However this diet is quite restrictive and so it could be possible to have a deficiency in some specific nutrients, increasing the risk of osteoporosis and fractures. Although there are conflicting results on the effects of the vegetarian diet on bone health and fracture incidence, it is always recommendable in vegetarian people to have an adequate intake of calcium and vitamin D, through an increased intake of supplements, natural and fortified foods, an adequate intake of protein, fruit, vegetables, as well as vitamin B12. The aim of this literature review is to revise the actual knowledge of the effect of some nutrients and vegetarian diets on bone health. Copyright © 2022 Falchetti, Cavati, Valenti, Mingiano, Cosso, Gennari, Chiodini and Merlotti
Variable Selection in Additive Models by Nonnegative Garrote
No full textWe adapt Breiman's (1995) nonnegative garrote method to perform variable selection in nonparametric additive models. The technique avoids methods of testing for which no reliable distributional theory is available. In addition it removes the need for a full search of all possible models, something which is computationally intensive, especially when the number of variables is moderate to high. The method has the advantages of being conceptually simple and computationally fast. It provides accurate predictions and is effective at identifying the variables generating the model. For illustration, we consider both a study of Boston housing prices as well as two simulation settings. In all cases our methods perform as well or better than available alternatives like the Component Selection and Smoothing Operator (COSSO).cross-validation, nonnegative garrote, nonparametric regression, shrinkage methods, variable selection
Evidence for the Maillard reaction in rat lung collagen and its relationship with solubility and age
No full textAbstractThis study investigated age-related changes in collagen solubility and collagen-linked fluorescence, and their relationship with the Maillard reaction. As a result of the collagen purification of rat lung samples, we obtained two pools of collagen with different degrees of solubility. The relative distribution of collagen between these two fractions was time-dependent, and the proportion of the smaller and less soluble fraction increased with time (r = 0.73, P < 0.0001). In this fraction, the intensity of fluorescence at Exc 335 nm/Em 385 nm, and the total amount of pentosidine increased with age ( r = 0.66, P < 0.002, and r = 0.69, P < 0.01, respectively). The mean values for fluorescence and pentosidine per milligram of collagen were, respectively, six and ten times greater in the less soluble fraction. In this fraction the pentosidine per milligram of collagen increased with age (r = 0.59, P < 0.03). Our results demonstrated the presence of pentosidine in rat lung collagen. Moreover, its accumulation in the less soluble fraction suggested a relationship between Maillard reaction products, physico-chemical changes in collagen solubility, and the ageing process in rat lungs
RESOLVING THE SURFACE CONTRIBUTION OF THE P L2, 3 VV AUGER LINESHAPE OF GAP(110) VIA USE OF (1 X-1) SB OVERLAYERS
No full textAn experimental and theoretical study of the band-like P L2,3VV Auger lineshape for GaP(110) is reported (kinetic energy almost-equal-to 120eV). By deposition of one monolayer of Sb (isoelectronic to P) we determine the surface-related Auger lineshape as the difference between the two spectra measured from the as-cleaved surface and the GaP/Sb interface. Theoretical calculations based on a single particle approach including different structural coordination models (i.e. ideally truncated surface, real relaxed surface, ordered Sb overlayer) are performed, which allows to isolate the surface contribution of the L2,3VV Auger profile from the bulk related lineshape. Moreover the results of the joint analysis are discussed giving excellent agreement between calculations and measurements and pointing toward an interpretation of the P LVV lineshape in terms of surface structural probe
EXPERIMENTAL AND THEORETICAL SURFACE COMPONENT OF THE PL2,3VV AUGER LINESHAPE IN GAP(110) - THE USE OF ORDERED (1X1) SB OVERLAYERS
No full textAn analysis of the theoretical and experimental surface contribution of the PL2,3VV Auger lineshape in GaP(110) is performed. From the theoretical point of view the lineshapes are calculated within a single-particle framework from a slab-by-slab tight-binding calculation of the ideal and real relaxed surfaces. The experimental information is extracted by comparing the Auger feature of as-cleaved GaP(110) and of the GaP(110) interfaced with one ordered monolayer of Sb. This allows the LVV surface component to be isolated. A comparison with theory, showing strong similarities in the position of the surface-related features is discussed
Comparison of one-dimensional and two-dimensional GRASS GIS models for flood mapping.
No full textThe first step of a risk assessment analysis is the evaluation of flood-prone areas. Nowadays, using Geographic Information System (GIS) technology for risk assessment analysis is very common. However, it is not widely used for defining inundated areas. LiDAR data, such as digital elevation models (DEM), makes GIS numerical models attractive methods for obtaining a flooded area automatically. A first approach (Federici & Sguerso, 2007; Marzocchi, 2009) uses a GIS module in order to simulate perifluvial flood maps, having as prerequisites (i) the conformation of the river floodplain by a high-resolution DEM and (ii) a water surface profile
along the river axis calculated for a given water discharge through a generic one-dimensional (1D) hydraulic model (HEC-RAS, Basement, MIKE 11, etc.). On the other hand, a second approach uses a GIS-embedded two-dimensional (2D) model in order to simulate flooded areas due to a dam break (Cannata&Marzocchi, Nat Hazards 61(3):1143–1159, 2012).
This module solves the conservative form of the 2D shallow water equations (SWE) using a finite volume method (FVM).
We present a comparison between the two models mentioned above, and we analyse the possibility of integrating these two approaches
ANION-SPECIFIC SURFACE VALENCE-BAND STATES IN HETEROPOLAR SEMICONDUCTORS - THE CASE OF GAP(110) AND INP(110)
No full textThe surface- and anion-specific valence-band states of heteropolar P containing III-V semiconductors [GaP(110) and InP(110)] have been determined by analysis of the Auger P L2,3 VV line shape of the ascleaved samples and the well-ordered epitaxial Sb-covered interfaces. The experimental spectra are analyzed in terms of slab-resolved partial density-of-states calculations performed for different surface structural models
SURFACE LOCAL DENSITY OF STATES OF INP(110) VIA PL2,3VV AUGER LINESHAPE - THE ROLE OF AN ORDERED (1X1) SB OVERLAYER
No full textAn experimental and theoretical investigation on the PL2,3VV Auger lineshape of the InP(110) surface is presented. A band-like picture provides a good description of the spectral features. In addition, deposition of one monolayer of Sb on InP(110) is shown to drive the surface atoms into an environment similar to that present in the bulk, so that a comparison between the PL2,3VV spectrum from the clean and Sb-covered sample allows us to discriminate between the surface contribution and the bulk contribution to this surface-sensitive Auger transition
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