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Search Results: 1 - 10 of 71100 matches for " Maria Agostina Vivaldi "
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Fractal and euclidean interaction in some transmission problems FRACTAL AND EUCLIDEAN INTERACTION IN SOME TRANSMISSION PROBLEMS
Maria Agostina Vivaldi
Le Matematiche , 2007,
Abstract: In this talk some model examples of second order elliptic transmission problems with highly conductive layers will be described. Regularity and numerical results for solutions of transmission problems across fractal layers imbedded in Euclidean domains will be presented in the aim of better understanding the analytical problems which arise when fractal and Euclidean structures mutually interact. In this talk some model examples of second order elliptic transmission problems with highly conductive layers will be described. Regularity and numerical results for solutions of transmission problems across fractal layers imbedded in Euclidean domains will be presented in the aim of better understanding the analytical problems which arise when fractal and Euclidean structures mutually interact.
Gold(I) and gold(III) complexes with anionic oxygen donor ligands: hydroxo, oxo and alkoxo complexes
Maria Agostina Cinellu,Giovanni Minghetti
Gold Bulletin , 2002, DOI: 10.1007/BF03214832
Abstract: The chemistry of gold(I) and gold(III) hydroxo, oxo and alkoxo complexes containing organic co-ligands is reviewed. Due to the high reactivity of the gold-oxygen bond most of these species can be employed as useful intermediates in many important processes. Alkoxides are by far the most numerous class among these species, and both gold(I) and gold(III) complexes are known with a variety of alkoxides. The recent discovery of the catalytic activity of some gold(I) and gold(III) fluoroalkoxides has enlivened the interest towards this class of compounds leading to new applications for previously known complexes, as is the case for a gold(III) siloxo complex which has found use as a precursor for CVD, as well as for the synthesis of new alkoxo derivatives. Another well represented and well known class of compounds are the gold(I) oxo complexes [O(AuPR3)3]+ which are the most effective aurating reagents. Gold(III) oxo complexes have been synthesized only recently and much of their chemistry is still largely to be explored. Preliminary studies suggest their potential in the transfer of oxygen atoms. Finally, some cationic gold(III) hydroxo complexes are found to display significant,and in some cases relevant, cytotoxic effects on cancer cell lines.
Prenatal exposure to serotonin reuptake inhibitors: a case report
Maria Marsella, Elisabetta Ubaldini, Agostina Solinas, Pietro Guerrini
Italian Journal of Pediatrics , 2010, DOI: 10.1186/1824-7288-36-27
Abstract: Selective serotonin reuptake inhibitor (SSRI) antidepressants are considered the primary treatments for depression and anxiety in pregnancy. Since intrauterine exposure to these drugs has been associated with poor neonatal adaptation, low birth weight, RDS, neurobehavioural symptoms, and potential teratogenic effects, further studies are needed to assess risks and mechanism of action of SSRIs. Meanwhile, it is advisable to evaluate for each patient the real risk/benefit ratio of continuing or suspending treatment during pregnancy.Recent studies report that depression and anxiety disorders affect 12-18% and 1.5-5% of pregnant women, respectively [1]. Selective serotonin reuptake inhibitor (fluoxetine, paroxetine, sertraline, etc) are considered the primary treatments for these disorders. In recent years several concerns have been raised about safety of some antidepressants during pregnancy.In utero exposure to an SSRI has been associated with many neonatal symptoms, including respiratory distress, feeding difficulties, and a wide spectrum of neurological symptoms. A neonatal abstinence syndrome (NAS), resulting from exposure to SSRIs during pregnancy, may explain this clinical syndrome, characterized by central nervous system, gastrointestinal, autonomic and respiratory symptoms [2,3]. In a cohort study, symptoms of NAS were present in 30% of exposed infants compared to none of the non-exposed control infants [4].Furthermore, concerns regarding persistent pulmonary hypertension, teratogenic risks, and neonatal adaptation have also been raised. In particular, recent studies have indicated an increased prevalence of certain malformations, as omphalocele, craniosynostosis, and, more consistently, heart defects in newborns exposed to SSRIs in utero [4-8].We here report details of two premature twins who, after in uteroexposure to SSRIs, presented symptoms compatible with the NAS and cardiovascular malformations.We describe the case of two monozygotic, naturally conceived
Bovine Lactoferrin Inhibits Toscana Virus Infection by Binding to Heparan Sulphate
Agostina Pietrantoni,Claudia Fortuna,Maria Elena Remoli,Maria Grazia Ciufolini,Fabiana Superti
Viruses , 2015, DOI: 10.3390/v7020480
Abstract: Toscana virus is an emerging sandfly-borne bunyavirus in Mediterranean Europe responsible for neurological diseases in humans. It accounts for about 80% of paediatric meningitis cases during the summer. Despite the important impact of Toscana virus infection-associated disease on human health, currently approved vaccines or effective antiviral treatments are not available. In this research, we have analyzed the effect of bovine lactoferrin, a bi-globular iron-binding glycoprotein with potent antimicrobial and immunomodulatory activities, on Toscana virus infection in vitro. Our results showed that lactoferrin was capable of inhibiting Toscana virus replication in a dose-dependent manner. Results obtained when lactoferrin was added to the cells during different phases of viral infection showed that lactoferrin was able to prevent viral replication when added during the viral adsorption step or during the entire cycle of virus infection, demonstrating that its action takes place in an early phase of viral infection. In particular, our results demonstrated that the anti-Toscana virus action of lactoferrin took place on virus attachment to the cell membrane, mainly through a competition for common glycosaminoglycan receptors. These findings provide further insights on the antiviral activity of bovine lactoferrin.
Self-interacting polynomials
F. Vivaldi
Mathematics , 2007,
Abstract: We introduce a class of dynamical systems of algebraic origin, consisting of self-interacting irreducible polynomials over a field. A polynomial f is made to act on a polynomial g by mapping the roots of g. This action identifies a new polynomial h, as the minimal polynomial of the displaced roots. By allowing several polynomials to act on one another, we obtain a self-interacting system with a rich dynamics, which affords a fresh viewpoint on some algebraic dynamical constructs. We identify the basic invariant sets, and study in some detail the case of quadratic polynomials. We perform some experiments on self-interacting polynomials over finite fields.
Therapy of Fabry disease with pharmacological chaperones: from in silico predictions to in vitro tests
Giuseppina Andreotti, Valentina Citro, Agostina De Crescenzo, Pierangelo Orlando, Marco Cammisa, Antonella Correra, Maria Vittoria Cubellis
Orphanet Journal of Rare Diseases , 2011, DOI: 10.1186/1750-1172-6-66
Abstract: A procedure to predict which genotypes responsive to pharmacological chaperones in Fabry disease has been recently proposed. The method uses a position-specific substitution matrix to score the mutations. Using this method, we have screened public databases for predictable responsive cases and selected nine representative mutations as yet untested with pharmacological chaperones. Mutant lysosomal alpha galactosidases were produced by site directed mutagenesis and expressed in mammalian cells. Seven out of nine mutations responded to pharmacological chaperones. Nineteen other mutations that were tested with pharmacological chaperones, but were not included in the training of the predictive method, were gathered from literature and analyzed in silico. In this set all five mutations predicted to be positive were responsive to pharmacological chaperones, bringing the percentage of responsive mutations among those predicted to be positive and not used to train the classifier to 86% (12/14). This figure differs significantly from the percentage of responsive cases observed among all the Fabry mutants tested so far.In this paper we provide experimental support to an "in silico" method designed to predict missense mutations in the gene encoding lysosomal alpha galactosidase responsive to pharmacological chaperones. We demonstrated that responsive mutations can be predicted with a low percentage of false positive cases. Most of the mutations tested to validate the method were described in the literature as associated to classic or mild classic phenotype. The analysis can provide a guideline for the therapy with pharmacological chaperones supported by experimental results obtained in vitro. We are aware that our results were obtained in vitro and cannot be translated straightforwardly into benefit for patients, but need to be validated by clinical trials.Fabry Disease (FD) [ORPHANET: orpha324, OMIM: 30150] is a pan-ethnic disorder caused by mutations in the gene encoding lyso
Fiebre Tifoidea: Complicaciones en 782 ni os hospitalizados
L. Maria Nelly Espinosa P,Santiago Rubio A,Eduardo Welch W,Agostina Olcese D
Revista chilena de pediatría , 1981,
Abstract:
Sele??o de matrizes e clones de mangabeira para o cultivo in vitro
Machado, Luana de Lima;Ramos, Maria Lucrécia Gerosa;Caldas, Linda Styer;Vivaldi, Lúcio José;
Pesquisa Agropecuária Brasileira , 2004, DOI: 10.1590/S0100-204X2004000500004
Abstract: high tax of mortality of mangabeira (hancornia speciosa) seedlings in greenhouse conditions hinders its use on the reversion of the degradation of the natural vegetation, as well as on the preservation of the production and environmental integrity. the objective of this work was to select better mother plants and clones from sexual and assexual propagation, with potential to survive in vitro, for producing mangaba seedlings. fruits were collected from 11 mother plants and from each plant, 24 seeds without aparent diseases were selected. after superficial desinfection, seeds were inoculated in ms medium without growth regulators and having a germination of 92.4% without significant difference between mother plants. on multiplication phase, with ms medium, with growth regulators bap (6-benzilaminopurine) and iba (indol-3-butiric acid), both at concentration of 1.28 mg l-1; the better mother plant was c1 and better clone was c1 15. during all phases of this work there was a high variability, mainly among clones. the selection must be made mainly among clones in mother plants.
Ecophysiological response to irrigation of two olive cultivars grown in a high-density orchard  [PDF]
G. A. Vivaldi, G. Strippoli, S. Camposeo
Agricultural Sciences (AS) , 2013, DOI: 10.4236/as.2013.48A003
Abstract:

High-density oliveculture system needs irrigation and introduces new cultivars in new environments. So the evaluation of varietal ecophysiological response to irrigation is a crucial topic. For this reason it was planned a research on two cultivars, Coratina and Arbequina, trained according to high-density system. In 2009 the irrigation was conducted according to the conventional management by applying an irrigation frequency of 4 days. The leaf water potentials reached values similar to the limits reported for the recovery within 48 hours. However, plants showed a leaf water status and gas exchange recovery just after 24 hours from watering. The results highlighted some varietal differences: Arbequina showed a better response to irrigation, while Coratina performed a higher water use efficiency by a lower leaf transpiration.

El Mercosur agrario: Integración para quién?
Agostina Costantino,Francisco Cantamutto
Iconos : Revista de Ciencias Sociales , 2010,
Abstract: Se estudian en este trabajo los efectos sobre la estructura agraria de la formación del Mercado Común del Sur (Mercosur). Este proceso de integración regional fue guiado por la perspectiva política del realismo periférico y dentro de un marco de regionalismo abierto, lo que consagró la apertura comercial como el aspecto más desarrollado del nuevo bloque. Este proceso tendió a favorecer a los grandes capitales. En el agro, en cambio, la agricultura familiar empezó a ser desplazar y a reforzarse un modelo concentrador y latifundista caracterizado por los monocultivos orientados a la exportación, organizado sobre relaciones capitalistas de producción.AbstractIn this work, we study the effect of the formation of the Southern Common Market (Mercosur) on the agrarian structure. This process of regional integration was guided by the peripheral realism political perspective and within the framework of open regionalism which consecrated open markets as the most developed aspect of the new block. This process tended to favor large capital. In the countryside, on the other hand, family farms began to be displaced and the large landholding model to be reinforced, characterized by monocultures oriented to export, a model organized according to capitalist production relations.
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