Encontrados 19 documentos, a visualizar página 1 de 2
Influence of seasons and land-use practices on soil microbial activity and meta...
Costa, Dalila; Freitas, H.; Sousa, J. P.The “Montado ecosystem” is important both economically and ecologically; this ecosystem is dominated by cork and holm oak trees (Quercus suber L. and Quercus rotundifolia Lam. respectively) combined with a rotation of crops/fallow/pastures. Diverse management strategies, deviating from the sustainable use of the ecosystem, have been implemented, from which arise some extreme situations of over-use or abandonmen...
Public Perception of Invasive Plant Species: Assessing the impact of workshop a...
Reis, Catarina Schreck; Marchante, Hélia; Freitas, H.; Marchante, ElizabeteInvasive species are one of the main threats to biodiversity worldwide. Even though they are identified and recognized as such by the Portuguese law, the majority of the population is not yet aware of this problem. Aiming to increase awareness about biological invasions among young students, a workshop on Invasive Plant Species was organized at the Botanical Museum of the University of Coimbra. A total of 170 t...
Phytoextraction of heavy metal polluted soils using Sedum plumbizincicola inocu...
Ma, Ying; Rajkumar, Mani; Luo, Yongming; Freitas, H.The aim of this study was to investigate the effects of metal mobilizing plant-growth beneficial bacterium Phyllobacterium myrsinacearum RC6b on plant growth and Cd, Zn and Pb uptake by Sedum plumbizincicola under laboratory conditions. Among a collection of metal-resistant bacteria, P. myrsinacearum RC6b was specifically chosen as a most favorable metal mobilizer based on its capability of mobilizing high conc...
Improvement of Ni phytostabilization by inoculation of Ni resistant Bacillus me...
Rajkumar, Mani; Ma, Ying; Freitas, H.The use of metal tolerant plants for the phytostabilization of metal contaminated soil is an area of extensive research and development. In this study the effects of inoculation of Ni-resistant bacterial strains on phytostabilization potential of various plants, including Brassica juncea, Luffa cylindrica and Sorghum halepense, were studied. A Ni-resistant bacterial strain SR28C was isolated from a nickel rich ...
No allelopathic effect of the invader Acacia dealbata on the potential infectiv...
Lorenzo, Paula; Rodríguez-Echeverría, Susana; Freitas, H.The invasion success of the leguminous tree Acacia dealbata Link has been related to the release of novel chemical compounds that affect both native plant performance and native soil bacterial communities. However, the allelopathic effect of A. dealbata on arbuscular mycorrhizal fungi (AMF) has not been explored. We used natural leachates from invasive A. dealbata and native soils to assess the bioactivity of t...
Seasonal and daily cycles of stem radial variation of Pinus pinaster in a droug...
Vieira, Joana; Rossi, Sergio; Campelo, Filipe; Freitas, H.; Nabais, C.High resolution measurements of stem diameter variation can provide valuable information on the growth process as well as the tree water status. This study investigates the hourly variations in stem radial increment of maritime pine growing on the west coast of Portugal, under a Mediterranean climate with a pronounced summer drought. We tested the hypotheses that (1) stem radius variation in maritime pine has a...
Flow cytometry as a tool to assess the effects of gamma radiation on the viabil...
Mesquita, N.; Portugal, A.; Piñar, G.; Loureiro, J.; Coutinho, A. P.; Trovão, J.; Nunes, I.; Botelho, M. L.; Freitas, H.Flow cytometry is often used for viability and vitality assessment in bacteria and yeasts. However, its application to the study of fungal spore development is uncommon, probably due to the difficulties in successfully staining these cells. In the current study, we used flow cytometry for the first time to assess the effects of a disinfection treatment on the survival, growth and metabolic activity of fungal sp...
Developmentally-programmed division of labour in the clonal invader Carpobrotus...
Roiloa, Sergio R.; Rodríguez-Echeverría, Susana; Freitas, H.; Retuerto, RubénInvasive species are one of the main causes for the loss of global biodiversity. However, the mechanisms that explain the success of invasive species remain unsolved. Clonal growth has been pointed out as an attribute that could contribute to the invasiveness of plants, however little research has been conducted to determine the importance of clonal traits in successful invaders. One of the most interesting att...
Assessing the suitability and safety of a well-known bud-galling wasp, Trichilo...
Marchante, H.; Freitas, H.; Hoffmann, J. H.Acacia longifolia is a widespread invasive plant species in Portugal. In South Africa, it is controlled by a bud-galling wasp, Trichilogaster acaciaelongifoliae, which could also be used in Portugal. Biological control of invasive alien plants has received little consideration anywhere in Europe and has never been attempted in Portugal. The lack of a suitably-large quarantine facility necessitated the use of a ...
The Na+/glucose cotransporters: from genes to therapy
Sabino-Silva,R.; Mori,R.C.; David-Silva,A.; Okamoto,M.M.; Freitas,H.S.; Machado,U.F.Glucose enters eukaryotic cells via two types of membrane-associated carrier proteins, the Na+/glucose cotransporters (SGLT) and the facilitative glucose transporters (GLUT). The SGLT family consists of six members. Among them, the SGLT1 and SGLT2 proteins, encoded by the solute carrier genes SLC5A1 and SLC5A2, respectively, are believed to be the most important ones and have been extensively explored in studie...
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