Flora

The invaluable commented checklist of the vascular flora of the ultramafic rocks of northeastern Portugal of Pinto da Silva (1970) has been recently reviewed by Aguiar and Monteiro-Henriques (ined.). These authors’ accept 568 taxa, 29% of which (164 taxa) are new additions to the original catalogue of Pinto da Silva (1970). A subset of it with the most frequent and floristically relevant species is presented in Table 6. New additions have been highlighted with an asterisk (*). The most noticeable neophytes have been included and marked with an open rhombus (◊). A few synonyms have been added to facilitate the reading of the list of Pinto da Silva (1970). Familiar circumscription and higher taxa are according, respectively, to APG III (2009) and Chase & Reveal (2009). The main sources of infrafamiliar taxonomic information were the Flora Iberica (Castroviejo 1981+), Nova Flora de Portugal (Franco 1971; 1984; Franco & Rocha Afonso (1994; 1998), The Checklist of the Portuguese Vascular Flora (Sequeira et al. 2011) and, among others, the taxonomic revisions of Romero et al. (1988) (Agrostis), Díaz Lifante & Valdés (1996) (Asphodelus), La Guardia & Blanca (1987) (Scorzonera), Schippmann (1991) and Voght (1991) (Leucanthemum). We followed different taxonomic or nomenclatural criteria from Flora Iberica or Nova Flora de Portugal in Armeria langei subsp. marizii, Anthyllis sampaioana, A. vulneraria subsp. lusitanica, Alyssum serpyllifolium subsp. lusitanicum, Asplenium adiantum-nigrum subsp. corunnense, Carlina hispanica, Centaurea langei, Festuca elegans subsp. merinoi, Helianthemum apenninum subsp. rothmaleri, Tuberaria guttata and Trifolium striatum var. brevidens. The preparation of a checklist of ultramafic vascular flora is a difficult task. First of all, flora checklists are unfinished assignments because plants come and go with time. On the other hand, the northeastern Portugal ophiolites lithology is heterogeneous and complex. Peridotites, and similar ultramafic rocks, appear in stretched outcrops dispersed among macromorphologically similar basic rocks. The soils that have covered the ultramafic rocks many times catch materials from nearby mafic and leucocratic rocks. Finally, deep soils, rich in organic matter, derived from ultramafic rocks, usually have a similar flora to other nearby lithologies. The serpentine effect is in practice impossible to spatialize and quantify; consequently an ultramafic vascular flora checklist brings together plants of rather diverse ecology, and is by itself of limited scientific value

Paths to Mobility Support in the Future Internet

The efficient support of various mobility types is one of the main challenges in anticipating evolutions towards the Future Internet. The European 4WARD project applies a "clean-slate" architectural approach where the Generic Path, a new communication abstraction, organizes the necessary cooperation between nodes for realising a wide range of communication services from unicast/multicast conversational services to multi point transfer between cooperating information objects. Our work addresses the challenges of supporting different mobility types in the context of Generic Paths by elaborating innovative schemes that will be further evaluated and combined in a second step. The Dynamic Mobility Anchoring proposal considers the distribution of mobility anchors in Access Nodes realising the necessary traffic indirection when hosts connectivities change. Anchorless mobility applies a more abstract approach where so called compartment are used to realise dynamic bindings between end points. A main issue for supporting wide scale mobility is the availability of a common namespace and an efficient resolution scheme. We address this issue with a high focus. Lastly considering mobile ad hoc networking as a key environment for its high level of dynamicity, we envisage the application of end to end concurrent multi-path transfer methods in such a context. Our research opens several future perspectives such as further designing, evaluating, refining and combining the different innovations and algorithms in a coherent mobility framework for Generic Paths

Impactos do estresse sobre a produção animal.

No presente trabalho são destacadas as respostas endocrinológicas ao estresse, como o aumento da secreção de cortisol, que prepara o indivíduo para enfrentar situações adversas. São também abordados aspectos inerentes ao estresse sobre as funções produtivas, reprodutivas e imunológicas.bitstream/CNPC/20752/1/doc70.pd

Two interacting atoms in a cavity: exact solutions, entanglement and decoherence

We address the problem of two interacting atoms of different species inside a cavity and find the explicit solutions of the corresponding eigenvalues and eigenfunctions using a new invariant. This model encompasses various commonly used models. By way of example we obtain closed expressions for concurrence and purity as a function of time for the case where the cavity is prepared in a number state. We discuss the behaviour of these quantities and and their relative behaviour in the concurrence-purity plane.Comment: 10 pages, 3 figure

Iterative Structural and Functional Synergistic Resolution Recovery (iSFS-RR) Applied to PET-MR Images in Epilepsy

Structural Functional Synergistic Resolution Recovery (SFS-RR) is a technique that uses supplementary structural information from MR or CT to improve the spatial resolution of PET or SPECT images. This wavelet-based method may have a potential impact on the clinical decision-making of brain focal disorders such as refractory epilepsy, since it can produce images with better quantitative accuracy and enhanced detectability. In this work, a method for the iterative application of SFS-RR (iSFS-RR) was firstly developed and optimized in terms of convergence and input voxel size, and the corrected images were used for the diagnosis of 18 patients with refractory epilepsy. To this end, PET/MR images were clinically evaluated through visual inspection, atlas-based asymmetry indices (AIs) and SPM (Statistical Parametric Mapping) analysis, using uncorrected images and images corrected with SFS-RR and iSFS-RR. Our results showed that the sensitivity can be increased from 78% for uncorrected images, to 84% for SFS-RR and 94% for the proposed iSFS-RR. Thus, the proposed methodology has demonstrated the potential to improve the management of refractory epilepsy patients in the clinical routine

Silicon emissivity as a function of temperature

In this paper we present the temperature-dependent emissivity of a silicon sample, estimated from its cool-down curve in a constant low temperature environment ( ~ 82K). The emissivity value follow a linear dependency in the 120–260 K temperature range. This result is of great interest to the LIGO Voyager gravitational wave interferometer project since it would mean that no extra high thermal emissivity coating on the test masses would be required in order to cool them down to 123 K. The results presented here indicate that bulk silicon itself can have sufficient thermal emissivity in order to cool the 200 kg LIGO Voyager test masses only by radiation in a reasonable short amount of time (less than a week). However, it is still not clear if the natural emissivity of silicon will be sufficient to maintain the LIGO Voyager test masses at the desired temperature (123 K) while removing power absorbed by the test masses. With the present results, a black coating on the barrel surface of the test masses would be necessary if power in excess of 6 W is delivered. However, the agreement we found between the hemispherical emissivity obtained by a theory of semi-transparent Silicon and the obtained experimental results makes us believe that the LIGO Voyager test masses, because of their dimensions, will have effective emissivities around 0.7, which would be enough to remove about 8.6 W (7.5 W) for a shield at 60 K (80 K). This hypothesis may be confirmed in the near future with new measurements