48 documents found, page 1 of 5
Integrating Ecotoxicological Assessment to Evaluate Agricultural Impacts on Aqu...
Catarino, A.; Mourinha, C.; Custódio, M.; Anastácio, P.; Palma, P.This study analyzed the use of a toolbox to evaluate the impact of agricultural activity on the water quality/status classification of a hydro-agricultural reservoir (Lage reservoir, Southern Portugal). The framework integrated the quantification of a group of 51 pesticides and ecotoxicological endpoints with organisms from different trophic categories (the bacterium Aliivibrio fischeri, the microalga Pseudokir...
Monitoring mulch-based solutions to reduce runoff and erosion in a variety of l...
Canedo, João; Coelho, Luisa; Basch, Gottlieb; Cabrita, Maria João; Cachapa, Filipa; Caldeira, Filipa; Gonzalez-Pelayo, Óscar; Marques, J. TiagoSoil erosion is a critical socio-environmental problem for rural Mediterranean ecosystems and landscapes. Erosion inflicts multiple, serious damages in agro-ecosystems, including vineyards and olive groves, and also in other semi-natural ecosystems such as the Montado (cattle-sheep pastureland combined with Quercus sp. trees). In particular, erosion reduces the water storage capacity, soil organic matter, nutri...
Water Quality Assessment of a Hydro-Agricultural Reservoir in a Mediterranean R...
Catarino, A.; Martins, I.; Mourinha, C.; Santos, J.; Tomaz, A.; Anastácio, P. M.; Palma, P.In regions where drought has become a common occurrence for most of the year and where agriculture is the main economic activity, the development of hydro-agricultural systems has made it possible to improve water management. Despite this, the intensification of agriculture combined with climate change leads to a potential decrease in water quality and water management practices are essential to improve agro-en...
Potentially Toxic Elements’ Contamination of Soils Affected by Mining Activitie...
Mourinha, C.; Palma, P.; Alexandre, C.; Cruz, N.; Rodrigues, S.M.; Alvarenga, P.Both sectors of the Iberian Pyrite Belt, Portuguese and Spanish, have been exploited since ancient times, but more intensively during and after the second half of the 19th century. Large volumes of polymetallic sulfide ore were extracted in open pits or in underground works, processed without environmental concerns, and the generated waste rocks and tailings were simply deposited in the area. Many of these mini...
Variabilidade em pastagens permanentes: contribuição para um projecto de Agricu...
Serrano, J. M.; Peça, J. O.; Gonçalves, V.; Palma, P.; Carvalho, M. J.; Silva, J. R.; Roma, J.Neste trabalho divulgam-se os resultados da avaliação sistemática de uma parcela de pastagem permanente biodiversa em termos das propriedades físicas e químicas do solo e da composição florística da pastagem. Esta informação geo-referenciada constitui a base para a tomada de decisão num projecto de Agricultura de Precisão com utilização de novas tecnologias de aplicação diferenciada de fertilizantes. São aprese...
Spatial distribution and morphometry of permafrost-related landforms in the Cen...
Fernandes, Marcelo; Palma, P.; Lopes, L.; Ruiz-Fernández, J.; Pereira, P.; Oliva, MarcPresent and past permafrost distribution in the Pyrenees is still under discussion. As in other mid-latitude mountain regions, rock glaciers and protalus lobes are the main indicators of permafrost conditions. In this paper we examine the distribution of these landforms in Aran and Boí valleys, formerly glaciated U-shaped valleys ranging from 600 to 3000 m in the southern and northern sides of the Central Pyren...
Ecological and ecotoxicological responses in the assessment of the ecological s...
Palma, P.; Matos, C.; Alvarenga, Paula; Kock-Schulmeyer, M.; Simões, I.; Barceló, D.; López de Alda, M.J.The objective of the study was to assess the integrated use of macroinvertebrate indexes and ecotoxicological parameters in the evaluation of the ecological status of a temporary stream with a strong agricultural influence. Water quality was analysed at two sampling sites along the stream, considering: chemical supporting parameters; hazardous substances (pesticides); benthic macroinvertebrate communities, thro...
Spatial and temporal patterns of ecological risk induced by pesticides in Alque...
Palma, P.; Köck-Schulmeyer, M.; Alvarenga, P.; Ledo, L.; López-de-Alda, M.; Barceló, D.The purpose of this study was to evaluate the potential impact of pesticides detected in the Alqueva reservoir (Guadiana Basin, South Iberian Peninsula) on the aquatic organisms belonging to this ecosystem. For this purpose, the occurrence and risk assessment of 25 pesticides, and of a number of their degradation products, were determined in the Alqueva surface waters. The target pesticides, which belonged to t...
Photodynamic Antimicrobial Chemotherapy for Root Canal System Asepsis: A Narrat...
Diogo, P.; Gonçalves, T.; Palma, P.; Santos, J. M.Aim. The aim of this comprehensive literature review was to address the question: Does photodynamic therapy (PDT) improve root canal disinfection through significant bacterial reduction in the root canal system? Methodology. A comprehensive narrative literature review was performed to compare PDT effect with sodium hypochlorite as the comparative classical irrigant. Two reviewers independently conducted literat...
Ligações estruturais do tipo madeira-madeira com placas de madeira densificada ...
Palma, P.; Kobel, P.; Minor, A.; Frangi, A.O comportamento de ligações do tipo madeira-madeira com placas de madeira densificada e ligadores do tipo cavilha de FRP foi analisado experimentalmente e foi desenvolvido um modelo de cálculo com base nas expressões da EN 1995-1-1. Foram realizados ensaios de esmagamento localizado em placas de madeira densificada e ensaios de caracterização dos ligadores de FRP, bem como ensaios de ligações estruturais fabric...