Vegetação do território do Alto Camaquã: obtenção, tratamento e classificação de imagens de satélite Landsat TM.

O território do Alto Camaquã; Síntese metodológica; Análise de imagens de satélite para a produção de uma carta de vegetação do Alto Camaquã.bitstream/item/31982/1/DT-106online.pd

Território do Alto Camaquã: apresentação da cobertura vegetal do Alto Camaquã junho de 2007.

O Território do Alto Camaquã; Apresentação da carta de vegetação do Território Alto Camaquã-RS; Apresentação do SIG LABECO-CPPSul; Apresentação do guia metodológico; Análise da carta de vegetação.bitstream/item/31990/1/DT-107online.pd

Towards a plurilingual habitus: engendering interlinguality in urban spaces

This article focuses on the potential of the multilingual city to create spaces in which monolingual hegemonies may be challenged, inclusive, intercultural values may be nurtured, and plurilingualism may be valorised. Following a contextualisation of linguistic diversity in theories of globalisation and superdiversity, discourses of deficit and power are addressed, arguing that the problematisation of multilingualism and pathologisation of plurilingualism reflect a monolingual habitus. Bringing about a shift towards a plurilingual habitus requires a Deep Approach, as it involves a critical revaluing of deep-seated dispositions. It suggests that the city offers spaces, which can engender interlinguality, a construct that includes interculturality, criticality and a commitment to creative and flexible use of other languages in shared, pluralistic spaces. It then proposes critical, participatory and ethnographic research in three multidimensional spaces: the urban school and a potential interlingual curriculum; networks, lobbying for inclusive policy and organising celebratory events in public spaces; and grass roots-level local spaces, some created by linguistic communities to exercise agency and maintain their languages and cultures, and some emerging as linguistically hybrid spaces for convivial encounter

Hybridization of finite element-boundary element me hods using an absorbing boundary condition for vibro-acoustic underwater noise simulations

Sound propagation from industrial activities in underwater or estimation of the target strength o waterside security systems are considered immensely important by many scientists for both regulators of development projects or military aspects. This paper presents a comparison of numerical methods used to model large scale acoustic coupled fluid structure interaction underwater problems. Concerning the mechanical behavior of the structure, it is absolutely essential during the computation of the modal basis to take into account the added mass effect of the heavy fluid, the water, around the structure. In that work, the added mass matrix is evaluated by a Boundary Element Method and the modal basis is computed by a sub- structuring algorithm to deal with both large number of degrees of freedom and modes. On the acoustic point of view, this article presents an efficient way to deal with very complex and large scale underwater target. This method is competing against standard Perfectly Match Layers (PML), Infinite Element Method (IEM), standard Boundary Element Method (BEM) and more recently the coupled MultiLevel Fast Multipole Method (MLFMM). Reducing considerably both computational time and RAM requirement keeping a very good accuracy, this approach hybridizes advantages of FEM, BEM and MLFMM methods through a domain decomposition technic using an Adaptive Absorbing Boundary Condition (AABC). Some numerical results are presented to present the capabilities of that approach on academic cases but also on more industrial applications

Plasma treatment of electrodes significantly enhances the development of anodic electrochemically active biofilms

Surface modifications of electrode materials are important for improved performance of microbial bio-electrochemical systems. Here, we studied the effect of pre-treating both glassy carbon and graphite felt electrodes with either an oxygen or a nitrogen plasma before reactor inoculation with a mixed microbial consortia. The plasma produces chemical modifications at the electrode surface level. X-ray photoelectron spectroscopy and water contact angle analysis showed that the plasma removes surface contamination, produces ion implantation and renders the hydrophobic surfaces highly hydrophilic. Plasma pre-treatment considerably accelerated the generation of a bio-electrochemical anodic current after inoculation. Nitrogen plasma pre-treatment yielded the best performance, followed closely by oxygen plasma. Plasma pre-treated electrodes reached a plateau of maximum current density twice as fast as untreated electrodes. Analysis of the current development profiles suggests that the plasma pre-treatment is neither producing a preferential attachment of certain types of bacteria over others nor accelerating the extracellular electron transfer rate. The results indicate that the plasma treatment considerably enhances the initial cell adhesion, which results in subsequently faster biofilm development. Plasma pre-treatment of electrodes is an inexpensive, fast, safe and straightforward technique to achieve more rapid start-up of bio-electrochemical processes

The histone H4 Lys 20 methyltransferase PR-Set7 regulates replication origins in mammalian cells

The initiation of DNA synthesis is governed by the licensing of replication origins, which consists of assembling a pre-replication complex (pre-RC) on origins during late M- and G1-phases. In metazoans, functional replication origins do not show defined DNA consensus sequences, thus evoking the involvement of chromatin determinants in the selection of these origins. Here, we show that the onset of licensing in mammalian cells coincides with an increase in histone H4 Lys 20 monomethylation (H4K20me1) at replication origins by the methyltransferase PR-Set7 (also known as Set8 or KMT5A). Indeed, tethering PR-Set7 methylase activity to a specific genomic locus promotes the loading of pre-RC proteins on chromatin. In addition, we demonstrate that PR-Set7 undergoes a PCNA- and Cul4-Ddb1-driven degradation during S phase that contributes to the disappearance of H4K20me1 at origins and the inhibition of replication licensing. Strikingly, expression of a PR-Set7 mutant insensitive to this degradation causes the maintenance of H4K20me1 and repeated DNA replication at origins. These results elucidate a critical role for PR-Set7 and H4K20me1 in the chromatin events that regulate replication origins