Bacteria associated with the nematode Bursaphelenchus xylophilus, a pathogen of trees and the causal agent of pine wilt disease (PWD) may play a role in the disease. In order to evaluate their role (positive or negative to the tree), strains isolated from the track of nematodes from infected Pinus pinaster trees were screened, in vitro, for their nematicidal potential. The bacterial products, from strains more ...
Ochrobactrum tritici 5bvl1 is able to resist to high concentrations of chromate through the expression of an inducible chromate-resistant determinant, found in a mobile element (TnOtChr), which carries the genes, chrB, chrA, chrC and chrF. The regulation of chr operon present in TnOtChr, which is controlled by a transcriptional regulator, ChrB, was characterized in the current work. Fusions of chr promoter, or ...
The impoundment of rivers by dams is the biggest direct anthropogenic impact on the hydrological cycle. The utility of dams, as providers of water for human consumption, irrigation and electrical production, is undeniable. However, the price to pay, weighting benefits versus ecological impacts caused by dams, is enormous and often questionable. The deleterious ecological impacts caused by dams are detected at t...
O aumento da população humana e o crescente desenvolvimento tecnológico tem conduzido a um excessivo consumo de água consequentemente associado à degradação dos ecossistemas aquáticos. Surge assim a necessidade de avaliar o estado dos ecossistemas aquáticos, através de programas de monitorização adaptados às diferentes realidades. Inicialmente, estes programas foram desenvolvidos tendo em consideração os difere...
Optical phonon modes confined in CdSxSe1-x nanocrystal (NC) quantum dots (≈ 2 nm in radius) grown in a glass matrix by the melting-nucleation method, were studied by means of resonant Raman scattering (RRS)spectroscopy and theoretical modelling. The formation of nanocrystalline quantum dots (QDs) is evidenced by the observation of absorption peaks and theoretically expected resonance bands in the RRS excitation...
O principal objectivo deste trabalho consistiu na determinação da geometria dos PIF, no maciço granítico de Castelo Branco. Este estudo mostrou que para além de PIF em Modo I, também estão presentes em Modo II, sugerindo que as orientações encontradas NE-SW a NNE-SSW e E-W a ESEWNW podem ser interpretadas como conjugados relacionados com uma tensão máxima (σ1) orientada NE-SW. A orientação NNW-SSE corresponde a...
Generally, the traditional building techniques uses natural and local building materials such as stone, woodand earth and, are associated to building procedures that requires small amount of energy consumption and release an expressive noxious gases to atmosphere. The development of green building techniques that help the building industry contributing to a much more sustainable world may be inspired on these t...
A região de Trás-os-Montes e Alto Douro é rica em construções de tabique. Constatou-se que grande parte destas construções antigas apresenta um avançado estado de degradação. Este facto aliado à escassez de estudos científicos relativos às construções de tabique existentes nesta região motivou a realização deste trabalho de investigação que usa doze construções como amostragem e que é focado no estudo experimen...
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