24 documents found, page 1 of 3
Caderno de apoio - O sistema radicular
Cardoso, Hélia; Gazarini, LuizAs plantas possuem um sistema radicular subterrâneo com um crescimento direcionado para o centro da terra – geotropismo positivo (definido ao nível da columela – ver detalhes no ponto 1.3). Existem, no entanto, exceções, em que as raízes se desenvolvem no sentido inverso, podendo apresentar geotropismo negativo absoluto ou parcial (raízes plagiotrópicas), o que está intimamente relacionado com o grau de encharc...
Atmospheric levels of Alternaria and Cladosporium spores in the city of Beja an...
Almeida, Elsa; Caeiro, Elsa; Todo-Bom, Ana; Gazarini, Luiz; Duarte, AnaIntroduction – Fungal spores are one of the major biological components of the air but are still poorly studied and their influence on respiratory allergic disease is not recognized. In this work, we intend to determine the importance of the atmospheric spores of Alternaria and Cladosporium in respiratory allergic disease in Beja. Methods – The atmospheric levels of Alternaria and Cladosporium spores in Beja we...
Sensitization to grass allergens: Phl p1, Phl p5 and Phl p7 Phl p12 in Adult an...
Almeida, Elsa; Caeiro, Elsa; Todo-Bom, Ana; Duarte, Ana; Gazarini, LuizBackground In Portugal, the pollen types most implicated in respiratory allergy are grasses, olive and parietaria. The knowledge of sensitizations to molecular allergens in children and adults can contribute to better diagnosis and treatment of this pathology. Methods ImmunoCAP singleplex technology was used for molecular allergens and Phadia 250® automatic equipment. g205 (Phl p1); g215 (Phl p5b); g210 (Phl p7...
Differences in functional and xylem anatomical features allow Cistus species to...
Torres-Ruiz, José M; Cochard, Hervé; Fonseca, Elsa; Badel, Eric; Gazarini, Luiz; Vaz, MargaridaA significant increase in drought events frequency is predicted for the next decades induced by climate change, potentially affecting plant species mortality rates and distributions worldwide. The main trigger of plant mortality is xylem hydraulic failure due to embolism and induced by the low pressures at which water is transported through xylem. As the Mediterranean basin will be severely affected by climate ...
BIOACTIVE COMPOUNDS AND MORPHOLOGY IN OPUNTIA SPP. FRUITS FROM PORTUGUESE ECOTYPES
Reis, Carlos; Gouveia, Cecília; Vitorino, Maria; Gazarini, Luiz; Ribeiro, Maria; Peres, FátimaThe Opuntia spp. has minimal soil and water requirements, and the O. fi cus-indica, in particular is sought to be an alternative for the Mediterranean region agricultural economy. The morphology, bioactive compounds and antioxidant properties of fruits were studied in twenty Portuguese ecotypes belonging to four Opuntia species (O. fi cus-indica, O. robusta, O. dillenii and O. elata). The ecotypes were compared...
Níveis atmosféricos de esporos de Alternaria e Cladosporium na cidade de Beja e...
Almeida, Elsa; Caeiro, Elsa; Todo-Bom, Ana; Gazarini, Luiz; Duarte, AnaIntrodução – Os esporos fúngicos são uma das maiores componentes biológicas atmosféricas; no entanto, são ainda pouco estudados e não lhes é reconhecida a influência devida na doença alérgica respiratória. Neste trabalho pretende-se determinar a importância dos níveis de esporos atmosféricos de Alternaria e Cladosporium na doença alérgica respiratória na cidade de Beja. Método – Analisaram-se os níveis atmosfér...
Conservation of Mediterranean oak woodlands: understorey dynamics under differe...
Canteiro, Cátia; Pinto-Cruz, Carla; Simões, M. Paula; Gazarini, LuizThe effect of experimental disturbances on the dynamics of a shrub community was studied on a ‘Montado’ ecosystem, in southern Portugal. The evolution of the community physiognomy, composition and diversity were monitored after shrub clearing followed by biomass removal, deposition on soil surface and incorporation with the soil, over a 9-year period. Maximum shrub density was recorded in the first year after t...
Microclimatic specificity of a Mediterranean oak woodland (montado) in context ...
Nunes, Jorge; Andrade, José; Abreu, Francisco; Gazarini, Luiz; Madeira, ManuelThe effects of oak trees on microclimatic parameters in Quercus rotundifolia Lam. woodland in Alentejo, Southern Portugal, are reported. The results show that oak trees create a marked differentiation in the grass matrix between open and tree-canopied habitats. Compared to open areas, oak canopy cover is associated with lower soil moisture content, lower soil temperature and lower photosynthetically active radi...
A data mining approach to improve multiple regression models of soil nitrate co...
Nunes, Jorge; Madeira, Manuel; Gazarini, Luiz; Neves, José; Vicente, HenriqueThe changes in the soil nitrate concentration were studied during 2 years in a ‘‘montado’’ ecosystem, in the South of Portugal. Total rainfall,air and soil temperature and soil water content under and outside Quercus rotundifolia canopy were also evaluated. A cluster analysis was carried out using climatic and microclimatic parameters in order to maximize the intraclass similarity and minimize the interclass si...
Influence of Quercus ilex trees on herbaceous production and nutrient concentra...
Cubera, Elena; Nunes, Jorge; Madeira, Manuel; Gazarini, LuizIn an open woodland in Portugal, the nature of interactions between Quercus ilex trees and herbaceous plants was assessed during 2 years by studying how manipulation of incident solar radiation, water and nutrient supply affect the herbaceous biomass and N, K, P, Ca, Mg, and Mn concentrations. Measurements were carried out in three environments consisting of (1) open grassland, (2) beneath the tree canopy, and ...