Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99


Search Results: 1 - 10 of 2354 matches for " Rosana Gentile "
All listed articles are free for downloading (OA Articles)
Page 1 /2354
Display every page Item
A field comparison of two capture-mark-recapture estimators of small mammal populations
Gentile, Rosana;Fernandez, Fernando A.S;
Revista Brasileira de Zoologia , 1999, DOI: 10.1590/S0101-81751999000400020
Abstract: the results obtained by two estimators of population sizes, mnka and mh, were compared for four species of small mammmals - didelphis aurita wied, 1826, philander frenata (olfers, 1818), nectomys squamipes (brants, 1827) and akodon cursor (winge, 1887) - during a long-term population study. the mnka estimator consistently underestimated the population sizes in relation to mh. on the other, the probabilistic estimator mh, which reduces bias through the jackknife technique, could not be used in all cases as its assumptions were not always met. correction factors between the estimates obtained by the two methods were calculated for the last three species, for which catchability did not vary significantly in time and that presented positive correlation between the estimates by the two models. in order to combine the adavantages of both methods for small mammal population studies, is suggested the use of probabilistic closed population models and to calculate a correction factor based in another model which allow estimates in all cases, and which provides correlated estimates. this correction factors should be used in those cases where the probabilistic model cannot be used.
Nine-year demography of the black-eared opossum Didelphis aurita (Didelphimorphia: Didelphidae) using life tables
Kajin, Maja;Cerqueira, Rui;Vieira, Marcus V.;Gentile, Rosana;
Revista Brasileira de Zoologia , 2008, DOI: 10.1590/S0101-81752008000200007
Abstract: a population of the black-eared opossum, didelphis aurita wied-neuwied 1826, was studied during 1997-2006 by capture-mark-recapture in the atlantic forest in the state of rio de janeiro. cohorts were established with females marked still in the pouch, classified into five age classes. population parameters were estimated using life tables. survival was type iii and mortality was greatest in age classes i and ii, just after weaning. fecundity was inversely correlated with survival, reproductive value was inversely correlated with mortality and residual reproductive value was inversely correlated with fecundity. the intrinsic rate of increase was always close to zero and tended to be slightly negative. the black-eared opossum can be considered a good model species for this type of study.
A comparison of abundance estimators for small mammal populations
Marcelle Pacheco,Maja Kajin,Rosana Gentile,Priscilla L. Zangrandi
Zoologia (Curitiba) , 2013,
Abstract: A major difficulty in the application of probabilistic models to estimations of mammal abundance is obtaining a data set that meets all of the assumptions of the model. In this paper, we evaluated the concordance correlation among three population size estimators, the minimum number alive (MNA), jackknife and the model suggested by the selection algorithm in CAPTURE (the best-fit model), using long-term data on three Brazilian small mammal species obtained from three different studies. The concordance correlation coefficients between the abundance estimates indicated that the probabilistic and enumeration estimators were highly correlated, giving concordant population estimates, except for one species in one of the studies. The results indicate the adequacy of using enumeration estimates as indexes for population size when scarce data do not allow for the use of probabilistic methods. Differences observed in the behavior of enumeration and probabilistic methods among species and studies can be related to the exclusive sampling design of each area, species-specific movement characteristics and whether a significant portion of the population could be sampled.
Ecology of small mammals in a Brazilian rural area
D'Andrea, Paulo Sergio;Gentile, Rosana;Cerqueira, Rui;Grelle, Carlos Eduardo V;Horta, Claudia;Rey, Luis;
Revista Brasileira de Zoologia , 1999, DOI: 10.1590/S0101-81751999000300002
Abstract: a small mammal study was carried out in pamparr?o valley, sumidouro, state of rio de janeiro, brazil, from june 1991 to july 1996. the area was characterised by small rural properties with vegetable plantations, pasture lands and small forest fragments. small mammals were captured in seven line transects along the valley. eleven small mammal species were captured: the didelphid marsupials didelphis aurita, philander frenata and monodelphis americana, and the rodents nectomys squamipes, akodon cursor, oligoryzomys nigripes, bolomys lasiurus, oecomys concolor (sigmodontinae), rattus ratlus (murinae), proechimys iheringi and euryzygo-matomys guiara (echimyidae). the heterogeneous habitat configuration probably allowed the occurrence of marsupials and more rodent species when compared to studies in monoculture areas.
Population ecology of small rodents and marsupials in a semi-deciduous tropical forest of the southeast Pantanal, Brazil
Andreazzi, Cecilia S. de;Rademaker, Vitor;Gentile, Rosana;Herrera, Heitor M.;Jansen, Ana M.;D'Andrea, Paulo S.;
Zoologia (Curitiba) , 2011, DOI: 10.1590/S1984-46702011000600009
Abstract: the pantanal is a south american biome characterized by extensive plains and stark environmental seasonality. several habitats are subject to annual flooding, forcing small mammal species to aggregate in dry forest patches, which most likely influences their population dynamics and life history strategies. in order to investigate the seasonal influence on the life history traits of these small mammals, we conducted a 2-year mark-recapture study in the southeastern region of the brazilian pantanal (nhecolandia) and analyzed the population dynamics of the most abundant small mammal species with the jackknife estimator. a trapping effort of 21,560 trap-nights resulted in 615 individuals in 1,171 captures (success = 5.43%). three species of rodents - oecomys mamorae (thomas, 1906), thrichomys pachyurus (wagner, 1845), and clyomys laticeps (thomas, 1841) - and three species of marsupials - gracilinanus agilis (burmeister, 1854), thylamys macrurus (olfers, 1818), and monodelphis domestica (wagner, 1842) - were obtained. the most abundant species was o. mamorae, followed by g. agilis and t. pachyurus. oecomys mamorae was more abundant in the wet season and presented an opportunistic reproductive strategy. gracilianus agilis displayed increased population sizes in the dry season and synchronized, seasonal reproduction during the rainy season. thrichomys pachyurus had a small population size, delayed response to variations in environmental conditions and higher reproductive rates in the dry season. all species revealed different life history strategies (seasonal, opportunistic or delayed response to environmental variations), coinciding with periods of higher resource availability in order to maximize survival.
Time dependent dispersion of nanoparticles in blood vessels  [PDF]
Francesco Gentile, Paolo Decuzzi
Journal of Biomedical Science and Engineering (JBiSE) , 2010, DOI: 10.4236/jbise.2010.35072
Abstract: The dispersion of intravasculary injected nanoparticles can be efficiently described by introducing an effective diffusion coefficient Deff which quantifies the longitudinal mass transport in blood vessels. Here, the original work of Gill and Sankarasubramanian was modified and extended to include 1) the variati- on over time of Deff; 2) the permeability of the blood vessels and 3) non-Newtonian rheology of blood. A general solution was provided for Deff depending on space (?), time (?), plug radius (?c) and a subset of permeability parameters. It was shown that increasing the vessel plug radius (thus hematocrit) or permeability leads to a reduction in Deff, limiting the transport of nanoparticles across those vessels. It was also shown that the asymptotic time beyond which the solution attains the steady state behaviour is always independent of the plug radius and wall permeability. The analysis presented can more accurately predict the transport of nanoparticles in blood vessels, compared to previously developed models.
Application of Microwave Remote Sensing to Dynamic Testing of Stay-Cables
Carmelo Gentile
Remote Sensing , 2010, DOI: 10.3390/rs2010036
Abstract: Recent advances in radar techniques and systems have favoured the development of microwave interferometers, suitable for the non-contact vibration monitoring of large structures. The paper addresses the application of microwave remote sensing to the measurement of the vibration response in the stay-cables of cable-stayed bridges. The reliability and accuracy of the proposed technique were investigated by comparing the natural frequencies (and the cable tensions predicted from natural frequencies) identified from radar data and the corresponding quantities obtained using more conventional techniques. The investigation, carried out on the cables of two different cable-stayed bridges, clearly highlights: (a) the accuracy of the results provided by the microwave remote sensing; (b) the simplicity of use of the radar technique (especially when compared with conventional approaches) and its effectiveness to simultaneously measuring the dynamic response of all the stay-cables of an array.
Infección por Bordetella pertussis
Archivos argentinos de pediatr?-a , 2010,
Abstract: physiopathological, clinical, and epidemiological aspects of whooping cough, an acute highly contagious respiratory infection caused by bordetella pertussis, are described. different vaccination schedules are mentioned, since the vaccine was introduced, more than 40 years ago, until present; and the outbreacks ocurred in argentina during different periods. moreover, the recrudescense of the disease observed in several countries during last years is highlighted, particularly in preschool children, and even more in adolescents, and young adults.
A systematic review of quality of life and weight gain-related issues in patients treated for severe and persistent mental disorders: focus on aripiprazole
Salvatore Gentile
Neuropsychiatric Disease and Treatment , 2009, DOI: http://dx.doi.org/10.2147/NDT.S4167
Abstract: systematic review of quality of life and weight gain-related issues in patients treated for severe and persistent mental disorders: focus on aripiprazole Review (4017) Total Article Views Authors: Salvatore Gentile Published Date February 2009 Volume 2009:5 Pages 117 - 125 DOI: http://dx.doi.org/10.2147/NDT.S4167 Salvatore Gentile Department of Mental Health, ASL Salerno 1, Italy Abstract: Aripiprazole is a relatively novel second-generation antipsychotic belonging to the chemical class of benzisoxazole derivatives and is characterized by a unique pharmacological profile which suggests that the drug acts as a dopamine-serotonin system stabilizer. Whereas all previously available antipsychotics are antagonists at D2 receptors, aripiprazole is the only available partial agonist at these receptors. Thus, it has been suggested that aripiprazole could be associated with a relatively neutral impact on bodyweight, possibly reducing risks of a detrimental impact on the quality of life that often complicates management for a large number of patients diagnosed with severe and persistent mental disorders (SPMDs) treated chronically with antipsychotic medications. However, data from short- and long-term reviewed studies indicate that the prevalence rate of clinically relevant weight gain during therapy with this drug is similar to that occurring during treatments with other antipsychotic agents, either typical or atypical. Moreover, information on the impact of aripiprazole therapy on the quality of life of patients diagnosed with SPMDs is scarce and characterized by conflicting results. Given these results, further, large, well-designed studies are needed before confirming potential advantages of aripiprazole over first-generation antipsychotics and other SGAs.
Algebraic and geometric automorphisms of hypergroupoids
Giuseppe Gentile
Le Matematiche , 1998,
Abstract: Two concepts of automorphism of a hypergroupoid are introduced; the first one preserve the algebraic structure of a hypergroupoid, the second one preserve the geometric structure that one can associate naturally to a hypergroupoid. The groups of such automorphisms are studied, in particular in the case that the geometric space associated to a hypergroupoid is a Steiner system.
Page 1 /2354
Display every page Item

Copyright © 2008-2017 Open Access Library. All rights reserved.