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Search Results: 1 - 10 of 15202 matches for " Marco Astegiano "
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Inflammatory bowel disease: A proposal to facilitate the achievement of an unequivocal diagnosis
Gabriella Canavese,Gabrio Bassotti,Marco Astegiano,Isabella Castellano
World Journal of Gastroenterology , 2013, DOI: 10.3748/wjg.v19.i3.426
Abstract: Following the international guidelines criteria an adequate “diagnostic conclusion” of inflammatory bowel disease (IBD) can be achieved only if clinical, endoscopic and laboratory findings, together with sample technical adequacy and unequivocal histomorphological signs of the disease are available. Thus, a conclusive diagnosis requires a complex combination of clinical, endoscopic and histological data. A considerable number of endoscopic biopsies obtained from IBD patients do not meet the above-mentioned requirements. The aim of the present proposal is to introduce a binary system of evaluation in the “diagnostic conclusion” of the histopathological report that will help to simplify the clinical decisions and consequent patient management. In patients with no history of disease, the pathologist should classify the biopsies in “Diagnostic”, when the criteria established by the international guidelines are satisfied and “not diagnostic” when one or more of the above-mentioned criteria are not met. The term “not diagnostic” should replace “highly suggestive” and “probable”. This new terminology could avoid ambiguous expressions that encourage the clinician to classify the patient as affected by IBD without fulfilling all of the requirements for an accurate diagnostic approach.
2013 Update on Celiac Disease and Eosinophilic Esophagitis
Rinaldo Pellicano,Claudio De Angelis,Davide Giuseppe Ribaldone,Sharmila Fagoonee,Marco Astegiano
Nutrients , 2013, DOI: 10.3390/nu5093329
Abstract: Celiac disease is a chronic, immune-mediated disorder, characterized by small intestinal inflammation and villous atrophy after the ingestion of gluten by genetically susceptible individuals. Several extraintestinal manifestations have been associated to celiac disease. Eosinophilic esophagitis is a primary disorder of the esophagus characterized by upper gastrointestinal symptoms, absence of gastroesophageal reflux disease and more than 15 eosinophils per high-power field in biopsy specimens. Both celiac disease and eosinophilic esophagitis are caused by aberrant, but distinct, immune responses to ingested antigens and can be responsive to restricted food intake. The aim of this review is to assess whether there is an association between these two pathologies. In the majority of the studies examined, including the studies in pediatric population, the prevalence of eosinophilic esophagitis in subjects with celiac disease was about 10-times that of the general population. We suggest searching for eosinophilic esophagitis in all children undergoing endoscopy for suspicious celiac disease.
PROgnosticating COeliac patieNts SUrvivaL: The PROCONSUL Score
Federico Biagi, Annalisa Schiepatti, Georgia Malamut, Alessandra Marchese, Christophe Cellier, Sjoerd F. Bakker, Chris J. J. Mulder, Umberto Volta, Fabiana Zingone, Carolina Ciacci, Anna D’Odorico, Alida Andrealli, Marco Astegiano, Catherine Klersy, Gino R. Corazza
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0084163
Abstract: Introduction It has been shown that mortality rates of coeliac patients correlate with age at diagnosis of coeliac disease, diagnostic delay for coeliac disease, pattern of clinical presentation and HLA typing. Our aim was to create a tool that identifies coeliac patients at higher risk of developing complications. Methods To identify predictors of complications in patients with coeliac disease, we organised an observational multicenter case-control study based on a retrospective collection of clinical data. Clinical data from 116 cases (patients with complicated coeliac disease) and 181 controls (coeliac patients without any complications) were collected from seven European centres. For each case, one or two controls, matched to cases according to the year of assessment, gender and age, were selected. Diagnostic delay, pattern of clinical presentation, HLA typing and age at diagnosis were used as predictors. Results Differences between cases and controls were detected for diagnostic delay and classical presentation. Conditional logistic models based on these statistically different predictors allowed the development of a score system. Tertiles analysis showed a relationship between score and risk of developing complications. Discussion A score that shows the risk of a newly diagnosed coeliac patient developing complications was devised for the first time. This will make it possible to set up the follow-up of coeliac patients with great benefits not only for their health but also for management of economic resources. Conclusions We think that our results are very encouraging and represent the first attempt to build a prognostic score for coeliac patients.
LA EXPANSIóN FOLIAR DEL SORGO GRANíFERO EN RESPUESTA A PERíODOS CORTOS Y SúBITOS DE ESTRéS HíDRICO
Astegiano,Eugenio D.; Pilatti,Rubén A.;
Agronomía Tropical , 2003,
Abstract: summary the behavior of the foliar area of the eleventh leaf of sorghum, sorghum bicolor (l.) moench, plants, cultivated in pots in a greenhouse, was monitored for two days, during sudden exposures to different water stress situations, accomplished by the modification of the hydric offer in the soil, and until completing their maximum foliar expansion. the final effect of water stress was observed in the maximum foliar area expansions reached by leaves that were in expansion during the experiment (10°, 11°, 12° and 13° leaves), and in the expansion time of the eleventh leaf. leaf elongation during the period of hydric stress was attained by very similar diurnal and nocturnal leaf enlongation rate (ler). treatments with less water availability showed a greater decrease in the ler, in relation to the degree of reduction of soil's water content and the foliar hydric potentials (fhp), being very severe in the maximum hydric stress (20% of water in the ground available to the plant), where leaf elongation stopped. results showed a correlation between ler and fhp during the day and between air temperature and fhp during the night. all treatments that suffered some grade of hydric stress showed a decreasing rate of foliar expansion duration and a smaller final foliar area
Efectos de diferentes agroecosistemas en la dinámica de nitrógeno, fósforo y potasio en un cultivo de tomate Effects of different agro-ecosystems in the dynamic of nitrogen, phosphorous, and potassium in the tomato crop
Carlos Alberto Bouzo,Eugenio Domingo Astegiano
Revista mexicana de ciencias agrícolas , 2012,
Abstract: El objetivo de este trabajo fue evaluar la dinámica del nitrógeno, fósforo y potasio en cultivos de tomate y suelos en diferentes agroecosistemas. El trabajo consistió en estudiar el efecto de tres agroecosistemas: agrícola (T1), natural (T2) y hortícola (T3). Estos agroecosistemas se caracterizaron por la secuencia de los cultivos de maíz y trigo durante 8 a os (T1), vegetación natural de gramíneas (T2) y rotaciones de cultivos hortícolas durante 20 a os (T3). El estudio fue realizado en Santa Fe, Argentina (31° 15' S, 60° 50' W) entre 2009 y 2010, habiéndose utilizado un cultivar de tomate híbrido redondo de crecimiento indeterminado. La concentración de N-NO3- en los suelos tuvo un valor alto (< 65 ppm), al inicio del cultivo en los tres agroecosistemas. La concentración de P también fue muy alta (< 250 ppm) en el agroecosistema hortícola (T3) y menor en los restantes, con aproximadamente 50 ppm para T1 y 150 ppm para T2. Lo mismo sucedió en este agroecosistema con el K. El agroecosistema natural (T2) fue el que tuvo la menor concentración de P en el suelo. Las concentraciones de N, P y K resultaron con diferencias altamente significativas (p≤ 0.01) en las concentraciones de los tejidos de las plantas provenientes de los tres agroecosistemas. Las concentraciones de P en planta no resultaron deficientes en ningún agroecosistema. Sin embargo, las concentraciones de N y K fueron deficientes hacia el final del estudio en los agroecosistemas agrícola (T1) y natural (T2). The objective ofthis research was to evaluate the dynamics of nitrogen, phosphorous, and potassium in tomato crops and in different soils of agro-ecosystems. The research consisted of studying the effect of three agro-ecosystems: 1) agricultural (T1), natural (T2) and horticultural (T3). These agro-ecosystems are characterized by the sequence of the maize and wheat crops during 8 years (T1), natural vegetation of grasses (T2), and rotation of horticultural crops during 20 years (T3). The study was done in Santa Fe, Argentina (31° 15' S, 60° 50' W) between 2009 and 2010, having used a hybrid tomato crop, round with indeterminate growth. The concentration of N-NO3- in the soils had a high value (< 65 ppm) at the beginning of the crop in the three agro-ecosystems. The concentration of P was also very high (< 250 ppm) in the horticultural agro-ecosystem (T3) and less than the rest, with approximately 50 ppm for T1 and 150 ppm for T2. The same occurred in this agro-ecosystem with K. The natural agro-ecosystem (T2) was the one that had the lowest concentration of P in the soil. The concentratio
Fragmentación de hábitat, riqueza de polinizadores, polinización y reproducción de plantas nativas en el Bosque Chaque?o de Córdoba, Argentina
Galetto,Leonardo; Aguilar,Ramiro; Musicante,Mariana; Astegiano,Julia; Ferreras,Ana; Jausoro,Mariana; Torres,Carolina; Ashworth,Lorena; Eynard,Cecilia;
Ecolog?-a austral , 2007,
Abstract: we expect to find direct relationships between pollinator richness, these two processes and the area of the fragments. considering data obtained by many researchers for different forest sites, the following objectives were planned: i) to evaluate the relationship between fragment area, pollinator richness and pollination (measure as frequency of visits to the flowers), ii) to analyze at the species level the response patterns of variables related to the pollination (pollinator richness or frequency of visits) and reproduction (i.e., fruit production) processes within a gradient of fragmentation for many plants, iii) to compare trends obtained using different methodologies, and iv) to discuss results in the context of biodiversity conservation. contrarily to our expectations, direct relationships between fragment area and pollinator richness or frequency of floral visits were not found. on the other hand, results obtained for pollinator richness and fruit set by meta-analyses showed significant overall fragment size effect. the frequency of visits, on the contrary, did not show a significant overall size effect. the trends observed using the two methodologies were not uniform. pollinator and plant responses to fragmentation seem to be more complex than what was originally predicted. if the heterogeneity of trends found for many species within a fragmentation gradient is analyzed, a species-specific susceptibility is suggested. in addition, many species have showed variability among seasons in their tendencies within the gradient of fragmentation. when discussing conservation politics of the chaco forests of córdoba, it would be interesting to analyze those plant species and their pollinators that seem to be affected negatively by reduction of fragment size.
Peri-Urban Transformations in Agricultural Landscapes of Perugia, Italy  [PDF]
Marco Vizzari
Journal of Geographic Information System (JGIS) , 2011, DOI: 10.4236/jgis.2011.32011
Abstract: Urban fringes represent very complex landscapes because of their proximity and mutual dependency with cities and rural areas. These landscapes may be considered as transition entities characterized by fuzzy boundaries. An uncontrolled development of urban sprawl and land use changes in these areas may deter- mine negative impacts on all natural, economic and social components. Thus, urban fringes assume a key-role in modern landscape analysis, planning and management. Landscape analysis of these interfaces, as this study shows, can be effectively supported by GIS spatial modelling. The Settlement Density Index (SDI), developed through GIS spatial analysis techniques, expresses punctually the territorial gradients generated by the presence of settlements and allows the identification of the urban fringes in the two periods under invest-tigation. These areas are then characterized and analyzed quantitatively using detailed land use data. The comparison of the diachronic information highlights the transformations of peri-urban landscapes that appear mainly related to the modifications of spatial configuration of urban areas and to the changes of agricultural systems.
Multiple Lorentz Groups—A Toy Model for Superluminal Muon Neutrinos  [PDF]
Marco Schreck
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.310177
Abstract: In this article an idea is presented, which allows for the explanation of superluminal muon neutrinos. It is based on the introduction of a new superluminal, massless gauge boson coupling to the neutrino only, but not to other standard model particles. The model is discussed with regard to the Supernova 1987 (SN 1987) velocity bound on electron antineutrinos and the Cohen-Glashow constraint on superluminal neutrino propagation. The latter can be circumvented if— within the framework of the model—a sterile neutrino mixing with the active neutrino mass eigenstates is introduced. The suggestion of a sterile neutrino accounting for superluminal neutrinos has already been proposed in several papers. It is possible to choose mixing angles with the sterile neutrino sector such that the model respects both the SN 1987 bound and the muon neutrino travels superluminally.
Concept for Floating and Submersible Wireless Sensor Network for Water Basin Monitoring  [PDF]
Marco Allegretti
Wireless Sensor Network (WSN) , 2014, DOI: 10.4236/wsn.2014.66011
Abstract:
It will show the feasibility of a Wireless Sensor Network (WSN) devoted to monitoring water basin, river, lake, and sea both on the surface and in depth. The swarm of floating probes can be programmed to periodically sink some tens of meters below the surface, collecting data, characterizing water properties and then coming to the surface again. The life span of the probes may be assured by an on-board power supply or through batteries recharged by solar cells. The basic idea of the WSN is reported together with a detailed analysis of the operational constraints, the energy requirements, and the electronic and mechanical discussion.
Considerations on Mechanism Designs as Suitable for Cultural Heritage Evaluation  [PDF]
Marco Ceccarelli
Advances in Historical Studies (AHS) , 2013, DOI: 10.4236/ahs.2013.24022
Abstract: Technological developments can be considered part of Cultural Heritage that deserves to be preserved for historical records and memories to a large public. Such a preservation can be also useful from technical viewpoints both to track past evolutions and to understand future trends. In this paper both designs and approaches for mechanism design are illustrated as worthy of being considered elements of Cultural Heritage with both above mentioned values mainly but not only for engineers. Examples of mechanism inventions and design algorithms both for whole machines and mechanism components are reported to show how technical achievements are and can be considered for Cultural Heritage in a broad sense and application, not only for technical use.
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