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Flowering and fruiting of Aulonemia aristulata: a gynomonoecious woody bamboo s...
Grombone-Guaratini,M.T.; Nascimento,A.A.; Santos-Gonçalves,A.P.Aulonemia aristulata (Döll) McClure is a lignified bamboo species endemic to Brazil. This species occurs in southeastern forests and can reach high density at forest edges, dominating the understory of canopy-disturbed forest patches. The goal of this study was to describe the flowering period, floral biology, fruiting and seedling recruitment of A. aristulata in natural conditions in two areas located in ...
Assessment of chemical, biochemical and ecotoxicological aspects in a mine soil...
Alvarenga, P.; Palma, P.; Gonçalves, A.P.; Baião, N.; Fernandes, R.M.; Varennes, A. de; Vallini, G.; Duarte, E.; Cunha-Queda, A.C.A greenhouse pot experiment was conducted to evaluate the effect of sewage sludge (SS), of sugar beet sludge (SBS), or of a combination of both, in the remediation of a highly acidic (pH 3.6) metal-contaminated soil, affected by mining activities. The SS was applied at 100 and 200 Mg ha 1 (dry weight basis), and the SBS at 7 Mg ha 1. All pots were sown with Italian ryegrass (Lolium multiflorum Lam.). After 60 d...
Evaluation of composts and liming materials in the phytostabilization of a mine...
Alvarenga, P.; Gonçalves, A.P.; Fernandes, R.M.; Varennes, A.; Vallini, G.; Duarte, E.; Cunha-Queda, A.C.A microcosm experiment was carried out to evaluate the effects of municipal solid waste compost (MSWC) or garden waste compost (GWC), and liming materials in the rehabilitation of a soil affected by mining activities, and to study the use of perennial ryegrass (Lolium perenne L.) for phystostabilization. The performance of the amendments was assessed by soil chemical parameters, total and bioavailable metals (C...
Evaluation of tests to assess the quality of mine-contaminated soils
Alvarenga, P.; Palma, P.; Gonçalves, A.P.; Fernandes, R.M.; Varennes, A.; Vallini, G.; Duarte, E.; Cunha-Queda, A.C.An acid metal-contaminated soil from the Aljustrel mining area (a pyrite mine located in SW Portugal in the Iberian Pyrite Belt) was subjected to chemical characterisation and total metal quantiWcation (Cd, Cr, Cu, Ni, Pb and Zn). Water-soluble metals were determined and a sequential extraction procedure was used to investigate metal speciation. Two bioavailable metal fractions were determined: a mobile fractio...
Structural and magnetic properties of UFe6Ga6
Gonçalves, A. P.; Waerenborgh, J. C.; Sério, S.; Paixão, J. A.; Godinho, M.; Almeida, M.UFe6Ga6 polycrystalline samples were prepared by arc-melting, and single crystals were grown by the Czochralski method. This compound crystallizes in the orthorhombic ScFe6Ga6-type structure (space group Immm, a=5.0560(4), b=8.5484(7) and c=8.6914(7) A), an ordered variant of the ThMn12-type structure. A ferromagnetic-type transition at TC=530(5) K is seen in the magnetization and A.C.-susceptibility measuremen...
Crystallographic and magnetic properties of UFe5.8Al6.2 single crystals
Gonçalves, A. P.; Estrela, P.; Waerenborgh, J. C.; Paixão, J. A.; Bonnet, M.; Spirlet, J. C.; Godinho, M.; Almeida, M.Single crystals of UFe5.8Al6.2 were characterised by X-ray and neutron diffraction, 57Fe Mössbauer spectroscopy and magnetisation. The structure refinement by X-ray and neutron diffraction shows a ThMn12-type structure, the Fe atoms fully occupying the 8f and partially occupying the 8j positions. Mössbauer spectra confirm these occupations and further indicate a magnetic ordering below 293 K. Magnetisation meas...
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