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Search Results: 1 - 10 of 401103 matches for " Polidori M "
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Antioxidant Micronutrients in the Prevention of Age-related Diseases
Polidori M
Journal of Postgraduate Medicine , 2003,
Abstract: The role and functions of antioxidant micronutrients such as ascorbate (vitamin C), a-tocopherol (vitamin E) and carotenoids that are provided through the diet in aging and in the prevention of age-related diseases are discussed in the present work. In general, a healthy lifestyle involving regular exercise and avoidance of tobacco or alcohol abuse are the key to the prevention of several age-related diseases including cardiovascular diseases, dementia and cancer. A balanced and regular nutrition with at least five portions of fruit and vegetables per day is a critical constituent of such a healthy lifestyle.
Analysis of the pedaling biomechanics of master’s cyclists: A preliminary study
William M Bertucci,Ahlem Arfaoui,Guillaume Polidori
Journal of Science and Cycling , 2012,
Abstract: The crank torque represents the kinetics of the propulsive torque within the crank cycle. These kinetics are one of the important determinants of cycling performance. At our knowledge, works in literature concerning the pedaling pattern of master cyclist is lacking although this group of cyclists concerns the majority of practitioners. The purpose of this experimentation is to study the biomechanics of cycling in masters cyclists during an incremental test. Eleven trained masters cyclists (53.5 ± 4.1 years) have participated at this study. The results indicate that the master cyclists have a significant asymmetry (30 ± 8 to 23 ± 13 %) during the pedaling exercise at all power output level tested in this study (100, 150, 200 and 250 W). The present preliminary study suggests that the pedaling pattern asymmetry observed in the master cyclists should be taken into account to prevent knee or muscle overuse injuries.
Redox activity and chemical speciation of size fractioned PM in the communities of the Los Angeles – Long Beach Harbor
S. Hu,A. Polidori,M. Arhami,M. M. Shafer
Atmospheric Chemistry and Physics Discussions , 2008,
Abstract: In this study, two different types of assays were used to quantitatively measure the redox activity of PM and to examine its intrinsic toxicity: 1) in vitro exposure to rat alveolar macrophage (AM) cells using dichlorofluorescin diacetate (DCFH-DA) as the fluorescent probe (macrophage ROS assay), and: 2) consumption of dithiothreitol (DTT) in a cell-free system (DTT assay). Coarse (PM10–2.5), accumulation (PM2.5–0.25), and quasi-ultrafine (quasi-UF, PM0.25) mode particles were collected weekly at five sampling sites in the Los Angeles-Long Beach Harbor and at one site near the University of Southern California campus (urban site). All PM samples were analyzed for organic (total and water-soluble) and elemental carbon, organic species, inorganic ions, and total and water-soluble elements. Quasi-UF mode particles showed the highest redox activity at all Long Beach sites (on both a per-mass and per-air volume basis). A significant association (R2=0.61) was observed between the two assays, indicating that macrophage ROS and DTT levels are affected at least partially by similar PM species. Relatively small variation was observed for the DTT measurements across all size fractions and sites, whereas macrophage ROS levels showed more significant ranges across the three different particle size modes and throughout the sites (coefficients of variation, or CVs, were 0.35, 0.24 and 0.53 for quasi-UF, accumulation, and coarse mode particles, respectively). Association between the PM constituents and the redox activity was further investigated using multiple linear regression models. The results showed that OC was the most important component influencing the DTT activity of PM samples. The variability of macrophage ROS was explained by changes in OC concentrations and water-soluble vanadium (probably originating from ship emissions – bunker oil combustion). The multiple regression models were used to predict the average diurnal macrophage ROS and DTT levels as a function of the OC concentration at one of the sampling sites.
Relationships between size-fractionated indoor and outdoor trace elements at four retirement communities in Southern California
A. Polidori,K. L. Cheung,M. Arhami,R. J. Delfino
Atmospheric Chemistry and Physics Discussions , 2009,
Abstract: Indoor and outdoor water soluble trace elements (TEs) were analyzed on quasi-ultrafine (UF), accumulation, and coarse PM filter samples collected at four retirement communities, three located in the San Gabriel Valley and one in Riverside, CA. Our analysis indicates that a complex mix of vehicular, industrial, and soil-related emissions was responsible for the elemental concentrations measured at the three San Gabriel sites, while regional transport, soil re-suspension and, to a lower degree, local traffic contributed to TE levels observed in Riverside. In the quasi-UF mode, the magnitude of indoor/outdoor concentration ratios (I/O) for elements of anthropogenic origin was highly variable, reflecting the spatial heterogeneity of combustion sources in the study area. Indoor/outdoor ratios in accumulation mode PM were closer to 1, and more homogeneous across sites, indicating that elements associated with this size fraction penetrate indoors with high efficiencies. The lowest overall I/O ratios were obtained for elements found in coarse particles, consistent with the fact that only a small portion of coarse outdoor PM infiltrates indoors. The potential of S and other TEs to serve as tracers of indoor-penetrated particles of outdoor origin was also examined. Our results suggest that using the I/O ratio of S (I/OS) as a surrogate of the infiltration factor for PM2.5 [Finf(PM2.5)] might lead to an overestimation of the indoor PM2.5 originating outdoors. This is in contrast with what was reported in previous studies conducted in the Eastern US, where S has been consistently used as a reliable tracer of outdoor PM2.5 infiltrating indoors. Our differences may be due to the fact that in the Los Angeles basin (and in general in the Western US) PM2.5 includes a number of semi-volatile labile species, such as ammonium nitrate and several organic compounds, which volatilize either entirely or to a substantial degree upon building entry.
Llama Meat Nutritional Properties
P. Polidori,C. Renieri,M. Antonini,G. Lebboroni
Italian Journal of Animal Science , 2010, DOI: 10.4081/ijas.2007.1s.857
Abstract: The aim of this study was to determine the chemical composition of the muscle Longissimus thoracis taken from 20 llama males, reared in the Andean region, slaughtered at an age of 25 months and at a mean final body weight of 74kg. Llama meat showed a low fat (3.51%) and cholesterol content (58.16mg/100g), a good protein content (22.42%) and an ash content of 3.06%. The Warner-Bratzler shear force values determined in llama meat was 6.56 kg/cm2. This study confirmed that llama meat is healthy and nutritious, and represents a good source of proteins for Andean population.
Fresh forage in dairy ass’s ration: effect on milk fatty acid composition and flavours
B. Chiofalo,M. Polidori,R. Costa,E. Salimei
Italian Journal of Animal Science , 2010, DOI: 10.4081/ijas.2005.2s.433
Abstract: The first studies on the quali-quantitative aspects of ass’s milk have focussed the attention towards nutrition of human infants affected by multiple food intolerance (Carroccio et al., 2000). More recently, its use is studied also in cardiopathology prevention, in neonatal cerebral growth and in the regulation of the immuno-inflammatory system, where the fatty acids are directly implicated (Chiofalo et al., 2003).
Avoparcin Supplementation of Italian Friesian Dairy Cows Diet: Effects on Milk Quality
Paolo Polidori
Journal of Animal and Veterinary Advances , 2012,
Abstract: To evaluate the effects on milk quality of supplementary Avoparcin in the diet, 40 Italian Friesian dairy cows were divided into two homogeneous groups, the treated one fed with Avoparcin added to a mineral-vitaminic premix, the control one fed with the same premix without Avoparcin. The trial lasted 60 days after two adapting weeks; each cow of the treated group received 120 mg daily of Avoparcin during the treatment period. No differences were found beetwen the two groups of cows for the following parameters: milk yield, total protein, fat, somatic cells and total bacterial count, while in the milk of the treated group lactose content was significantly (p<0.001) higher. After 45 days of treatment, trans isomers fatty acid content significantly increased (p<0.05) in the milk of the treated group, and particularly trans-vaccenic acid. Also some unsaturated fatty acids (linoleic and linolenic acid) significantly increased (p<0.05) their concentrations in milk fat of cows fed with Avoparcin supplementation.
Sviluppo, ambiente, territorio: il metodo produttivo biologico
Roberto Polidori
Aestimum , 2003,
I nuovi estimi catastali: problematiche ed innovazioni
F. Polidori
Aestimum , 1998,
Analisi della produzione e consumo della carne di coniglio: un modello di equilibrio parziale
Roberto Polidori
Aestimum , 2004,
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