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Search Results: 1 - 10 of 325236 matches for " S. Licciardi "
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Quasi Exact Solution of the Fisher Equation  [PDF]
G. Dattoli, E. Di Palma, E. Sabia, S. Licciardi
Applied Mathematics (AM) , 2013, DOI: 10.4236/am.2013.48A002
Abstract: We propose an accurate non numerical solution of the Fisher Equation (FE), capable of reproducing the known analytical solutions and those obtained from a numerical analysis. The form we propose is based on educated guesses concerning the possibility of merging diffusive and logistic behavior into a single formula.
Products of Bessel functions and associated polynomials
G. Dattoli,E. Di Palma,E. Sabia,S. Licciardi
Physics , 2013,
Abstract: The symbolic method is used to get explicit formulae for the products or powers of Bessel functions and for the relevant integrals.
EDUCARE A COMPRENDERE IN UNA COMUNITà DI RICERCA
Ignazio Licciardi
European Journal of Sport Studies , 2013, DOI: 10.12863/ejssax1x1-2013x3
Abstract:
Capillary Network, Cancer and Kleiber Law
G. Dattoli,G. Dattoli,S. Licciardi,C. Guiot,T. S. Deisboeck
Quantitative Biology , 2014,
Abstract: We develop a heuristic model embedding Kleiber and Murray laws to describe mass growth, metastasis and vascularization in cancer. We analyze the relevant dynamics using different evolution equations (Verhulst, Gompertz and others). Their extension to reaction diffusion equation of the Fisher type is then used to describe the relevant metastatic spreading in space. Regarding this last point, we suggest that cancer diffusion may be regulated by Levy flights mechanisms and discuss the possibility that the associated reaction diffusion equations are of the fractional type, with the fractional coefficient being determined by the fractal nature of the capillary evolution.
Fleas of Small Mammals on Reunion Island: Diversity, Distribution and Epidemiological Consequences
Vanina Guernier ,Erwan Lagadec,Gildas LeMinter,Séverine Licciardi,Elsa Balleydier,Frédéric Pagès,Anne Laudisoit,Koussay Dellagi,Pablo Tortosa
PLOS Neglected Tropical Diseases , 2014, DOI: 10.1371/journal.pntd.0003129
Abstract: The diversity and geographical distribution of fleas parasitizing small mammals have been poorly investigated on Indian Ocean islands with the exception of Madagascar where endemic plague has stimulated extensive research on these arthropod vectors. In the context of an emerging flea-borne murine typhus outbreak that occurred recently in Reunion Island, we explored fleas' diversity, distribution and host specificity on Reunion Island. Small mammal hosts belonging to five introduced species were trapped from November 2012 to November 2013 along two altitudinal transects, one on the windward eastern and one on the leeward western sides of the island. A total of 960 animals were trapped, and 286 fleas were morphologically and molecularly identified. Four species were reported: (i) two cosmopolitan Xenopsylla species which appeared by far as the prominent species, X. cheopis and X. brasiliensis; (ii) fewer fleas belonging to Echidnophaga gallinacea and Leptopsylla segnis. Rattus rattus was found to be the most abundant host species in our sample, and also the most parasitized host, predominantly by X. cheopis. A marked decrease in flea abundance was observed during the cool-dry season, which indicates seasonal fluctuation in infestation. Importantly, our data reveal that flea abundance was strongly biased on the island, with 81% of all collected fleas coming from the western dry side and no Xenopsylla flea collected on almost four hundred rodents trapped along the windward humid eastern side. The possible consequences of this sharp spatio-temporal pattern are discussed in terms of flea-borne disease risks in Reunion Island, particularly with regard to plague and the currently emerging murine typhus outbreak.
Cytoplasmic Incompatibility as a Means of Controlling Culex pipiens quinquefasciatus Mosquito in the Islands of the South-Western Indian Ocean
Célestine M. Atyame,Nicole Pasteur,Emilie Dumas,Pablo Tortosa,Micha?l Luciano Tantely,Nicolas Pocquet,Séverine Licciardi,Ambicadutt Bheecarry,Betty Zumbo,Mylène Weill,Olivier Duron
PLOS Neglected Tropical Diseases , 2011, DOI: 10.1371/journal.pntd.0001440
Abstract: The use of the bacterium Wolbachia is an attractive alternative method to control vector populations. In mosquitoes, as in members of the Culex pipiens complex, Wolbachia induces a form of embryonic lethality called cytoplasmic incompatibility, a sperm-egg incompatibility occurring when infected males mate either with uninfected females or with females infected with incompatible Wolbachia strain(s). Here we explore the feasibility of the Incompatible Insect Technique (IIT), a species-specific control approach in which field females are sterilized by inundative releases of incompatible males. We show that the Wolbachia wPip(Is) strain, naturally infecting Cx. p. pipiens mosquitoes from Turkey, is a good candidate to control Cx. p. quinquefasciatus populations on four islands of the south-western Indian Ocean (La Réunion, Mauritius, Grande Glorieuse and Mayotte). The wPip(Is) strain was introduced into the nuclear background of Cx. p. quinquefasciatus mosquitoes from La Réunion, leading to the LR[wPip(Is)] line. Total embryonic lethality was observed in crosses between LR[wPip(Is)] males and all tested field females from the four islands. Interestingly, most crosses involving LR[wPip(Is)] females and field males were also incompatible, which is expected to reduce the impact of any accidental release of LR[wPip(Is)] females. Cage experiments demonstrate that LR[wPip(Is)] males are equally competitive with La Réunion males resulting in demographic crash when LR[wPip(Is)] males were introduced into La Réunion laboratory cages. These results, together with the geographic isolation of the four south-western Indian Ocean islands and their limited land area, support the feasibility of an IIT program using LR[wPip(Is)] males and stimulate the implementation of field tests for a Cx. p. quinquefasciatus control strategy on these islands.
Synergy between Repellents and Organophosphates on Bed Nets: Efficacy and Behavioural Response of Natural Free-Flying An. gambiae Mosquitoes
Cédric Pennetier,Carlo Costantini,Vincent Corbel,Séverine Licciardi,Roch K. Dabiré,Bruno Lapied,Fabrice Chandre,Jean-Marc Hougard
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0007896
Abstract: Chemicals are used on bed nets in order to prevent infected bites and to kill aggressive malaria vectors. Because pyrethroid resistance has become widespread in the main malaria vectors, research for alternative active ingredients becomes urgent. Mixing a repellent and a non-pyrethroid insecticide seemed to be a promising tool as mixtures in the laboratory showed the same features as pyrethroids.
Regulation of Immune Responses by Histone Deacetylase Inhibitors
Paul V. Licciardi,Tom C. Karagiannis
ISRN Hematology , 2012, DOI: 10.5402/2012/690901
Abstract:
Probiotic Therapy as a Novel Approach for Allergic Disease
Zheng Quan Toh,Paul V. Licciardi
Frontiers in Pharmacology , 2012, DOI: 10.3389/fphar.2012.00171
Abstract: The prevalence of allergic disease has increased dramatically in Western countries over the past few decades. The hygiene hypothesis, whereby reduced exposure to microbial stimuli in early life programs the immune system toward a Th2-type allergic response, is suggested to be a major mechanism to explain this phenomenon in developed populations. Such microbial exposures are recognized to be critical regulators of intestinal microbiota development. Furthermore, intestinal microbiota has an important role in signaling to the developing mucosal immune system. Intestinal dysbiosis has been shown to precede the onset of clinical allergy, possibly through altered immune regulation. Existing treatments for allergic diseases such as eczema, asthma, and food allergy are limited and so the focus has been to identify alternative treatment or preventive strategies. Over the past 10 years, a number of clinical studies have investigated the potential of probiotic bacteria to ameliorate the pathological features of allergic disease. This novel approach has stemmed from numerous data reporting the pleiotropic effects of probiotics that include immunomodulation, restoration of intestinal dysbiosis as well as maintaining epithelial barrier integrity. In this mini-review, the emerging role of probiotics in the prevention and/or treatment of allergic disease are discussed with a focus on the evidence from animal and human studies.
Evidence for Circulation of the Rift Valley Fever Virus among Livestock in the Union of Comoros
Matthieu Roger equal contributor ,Marina Beral equal contributor,Séverine Licciardi equal contributor,Miradje Soulé,Abdourahime Faharoudine,Coralie Foray,Marie-Marie Olive,Marianne Maquart,Abdouroihamane Soulaimane,Ahmed Madi Kassim,Catherine Cêtre-Sossah,Eric Cardinale
PLOS Neglected Tropical Diseases , 2014, DOI: 10.1371/journal.pntd.0003045
Abstract: Rift Valley fever virus (RVFV) is an arthropod-borne phlebovirus reported to be circulating in most parts of Africa. Since 2009, RVFV has been suspected of continuously circulating in the Union of Comoros. To estimate the incidence of RVFV antibody acquisition in the Comorian ruminant population, 191 young goats and cattle were selected in six distinct zones and sampled periodically from April 2010 to August 2011. We found an estimated incidence of RVFV antibody acquisition of 17.5% (95% confidence interval (CI): [8.9–26.1]) with a significant difference between islands (8.2% in Grande Comore, 72.3% in Moheli and 5.8% in Anjouan). Simultaneously, a longitudinal entomological survey was conducted and ruminant trade-related information was collected. No RVFV RNA was detected out of the 1,568 blood-sucking caught insects, including three potential vectors of RVFV mosquito species. Our trade survey suggests that there is a continuous flow of live animals from eastern Africa to the Union of Comoros and movements of ruminants between the three Comoro islands. Finally, a cross-sectional study was performed in August 2011 at the end of the follow-up. We found an estimated RVFV antibody prevalence of 19.3% (95% CI: [15.6%–23.0%]). Our findings suggest a complex RVFV epidemiological cycle in the Union of Comoros with probable inter-islands differences in RVFV circulation patterns. Moheli, and potentially Anjouan, appear to be acting as endemic reservoir of infection whereas RVFV persistence in Grande Comore could be correlated with trade in live animals with the eastern coast of Africa. More data are needed to estimate the real impact of the disease on human health and on the national economy.
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