Time filter

Source Type

Brezin E.,Ecole Normale Superieure de Paris | Brezin E.,French National Center for Scientific Research | Franz S.,University Paris - Sud | Parisi G.,SapienzaUniversity Rome | Parisi G.,University of Rome La Sapienza
Physical Review B - Condensed Matter and Materials Physics | Year: 2010

We consider two identical copies of a finite dimensional spin glass coupled at their boundaries. This allows to identify the analog for a spin glass of twisted boundary conditions in ferromagnetic system and it leads to a definition of an interface free energy that should scale with a positive power of the system size in the spin-glass phase. In this paper we study within mean-field theory the behavior of this interface at the spin-glass critical temperature Tc. We show that the leading scaling of the interface free energy may be obtained by simple scaling arguments using a cubic field theory of critical spin glasses and neglecting the replica symmetry-breaking dependence. © 2010 The American Physical Society.

Evangelista A.,Ospedale San Giovanni Calibita Fatebenefratelli Isola Tiberina | Gabriele S.,Third University of Rome | Nardinocchi P.,SapienzaUniversity Rome | Piras P.,SapienzaUniversity Rome | And 5 more authors.
Lecture Notes in Computational Vision and Biomechanics | Year: 2015

We present recent investigations on the state of strain in human left ventricle based on the synergy between continuum mechanics and echocardiographic imaging. When data from three-dimensional Speckle Tracking Echocardiography are available, special strain directions can be detected on the epicardial and endocardial surfaces, which are well-known in continuum mechanics as principal strain lines (PSLs), further classified into primary and secondary strain lines. An appropriate investigation on PSLs can help to identify lines where strains are largest as primary and smallest as secondary. As PSLs change when cardiac diseases appear, the challenge is that the analysis may allow for the identification of new indicators of cardiac function. © Springer International Publishing Switzerland 2015

Lionetti V.,SapienzaUniversity Rome | Cervone F.,SapienzaUniversity Rome | Bellincampi D.,SapienzaUniversity Rome
Journal of Plant Physiology | Year: 2012

The cell wall is a complex structure mainly composed by a cellulose-hemicellulose network embedded in a cohesive pectin matrix. Pectin is synthesized in a highly methyl esterified form and is de-esterified in muro by pectin methyl esterases (PMEs). The degree and pattern of methyl esterification affect the cell wall structure and properties with consequences on both the physiological processes of the plants and their resistance to pathogens. PME activity displays a crucial role in the outcome of the plant-pathogen interactions by making pectin more susceptible to the action of the enzymes produced by the pathogens. This review focuses on the impact of pectin methyl esterification in plant-pathogen interactions and on the dynamic role of its alteration during pathogenesis. © 2012 Elsevier GmbH.

Di Marco M.,SapienzaUniversity Rome | Di Marco M.,University of Queensland | Brooks T.,International Union for Conservation of Nature | Brooks T.,University of the Philippines at Los Banos | And 23 more authors.
Conservation Biology | Year: 2016

World governments have committed to increase the global protected areas coverage by 2020, but the effectiveness of this commitment for protecting biodiversity depends on where new protected areas are located. Threshold- and complementarity-based approaches have been independently used to identify important sites for biodiversity. We brought together these approaches by performing a complementarity-based analysis of irreplaceability in important bird and biodiversity areas (IBAs), which are sites identified using a threshold-based approach. We determined whether irreplaceability values are higher inside than outside IBAs and whether any observed difference depends on known characteristics of the IBAs. We focused on 3 regions with comprehensive IBA inventories and bird distribution atlases: Australia, southern Africa, and Europe. Irreplaceability values were significantly higher inside than outside IBAs, although differences were much smaller in Europe than elsewhere. Higher irreplaceability values in IBAs were associated with the presence and number of restricted-range species; number of criteria under which the site was identified; and mean geographic range size of the species for which the site was identified (trigger species). In addition, IBAs were characterized by higher irreplaceability values when using proportional species representation targets, rather than fixed targets. There were broadly comparable results when measuring irreplaceability for trigger species and when considering all bird species, which indicates a good surrogacy effect of the former. Recently, the International Union for Conservation of Nature has convened a consultation to consolidate global standards for the identification of key biodiversity areas (KBAs), building from existing approaches such as IBAs. Our results informed this consultation, and in particular a proposed irreplaceability criterion that will allow the new KBA standard to draw on the strengths of both threshold- and complementarity-based approaches. © 2016, Society for Conservation Biology.

Gabriele S.,Third University of Rome | Teresi L.,Third University of Rome | Varano V.,Third University of Rome | Evangelista A.,SapienzaUniversity Rome | And 3 more authors.
Computational Vision and Medical Image Processing IV - Proceedings of Eccomas Thematic Conference on Computational Vision and Medical Image Processing, VIPIMAGE 2013 | Year: 2014

We present and discuss a method to infer non invasively information on the fiber architecture in real LV walls. The method post–processes the echocardiographic data acquired by three–dimensional Speckle Tracking Echocardiography (3DSTE) through a MatLab–based protocol, already presented, discussed and validated in [5]. Our results reveals the difference between the role of endocardial and epicardial principal strain lines, at the systolic peak, and set the bases for possible future investigations aimed to analyze the onset of specific cardiac diseases through noninvasive analysis of LV fiber architecture. © 2014 Taylor & Francis Group, London.

Discover hidden collaborations