Encontrados 11 documentos, a visualizar página 1 de 2
O empreendorismo social e as estratégias de comunicação das instituições do ter...
Correia, Maria João Baía Cabral Antunes.O empreendorismo social afirma-se, no século XXI, como uma resposta aos problemas sociais, em especial para as instituições do terceiro sector. A escassez de recursos e a evolução do modelo de Estado Social em Portugal impõem a necessidade de novas soluções e mudanças nestas instituições, frequentemente desprovidas de uma visão estratégica na sua gestão. A comunicação integrada poderá ser uma das respostas para...
A importância dos fatores estruturais na garantia da segurança alimentar na pro...
Correia, Maria João; Rocha, AdaThe design of school canteens shall be subject to detailed studies regarding its functional and operational activity. It must consider several factors such as legal aspects, production technical requirements, architectural and working conditions as well as economic aspects in order to guarantee the correct and safe supply of the meals. In addition to literature review some technical visits were done to allow th...
A influência da temperatura na germinação de sementes do endemismo algarvio Tub...
Fernandes, Janete; Monteiro, José A.; Fernandes, Jacinta; Osório, Júlio; Correia, Maria JoãoAs sementes de Tuberaria major (willk.) P. Silva & Rozeira, um endemismo lusitano com distribuição limitada à região do Algarve, apresentam a testa dura, que é responsável pela dormência primária das mesmas.
Influence of transient shade periods on the effects of drought on photosynthesi...
Correia, Maria João; Osório, Maria Leonor; Osório, Júlio; Barrote, Isabel; Martins, Mónica; David, Maria ManuelaThe effects of a slow-imposing two-weeks soil drying period, and subsequent re-watering, on leaf water potential (Ψ), gas exchange rates, chlorophyll fluorescence and on the concentrations of malondialdehyde (MDA) and non-structural carbohydrates (starch, hexose and sucrose) were determined in mature leaves of sunflower plants growing under controlled environmental conditions. To assess how transient shade peri...
Influence of nutrient availability on drought-induced changes in the activity o...
David, Maria Manuela; Barrote, Isabel; Correia, Maria JoãoWe aimed to evaluate if plants with different nutrient availability evidenced a different capacity to overcome drought-induced oxidative stress. Membrane peroxidative damages as MDA concentration and the activity of several antioxidant enzymes were determined in leaves of well watered (WW) and water stressed (WS) H. annuus plants grown either with adequate (Adeq Nutr) or limited (Limit Nutr) nutrient regimes. C...
Effects of water deficit on the activity of nitrate reductase and content of su...
Correia, Maria João; Fonseca, Filomena; Azedo-Silva, João; Dias, Celeste; David, Maria Manuela; Barrote, Isabel; Osório, Maria Leonor; Osório, JúlioThe effects of a two weeks soil drying period on the activity of nitrate reductase (NR; EC 1.6.6.6) were studied on Helianthus annuus L. and non-nodulated Lupinus albus L. plants, growing under two nutrient supply regimes. NR activity was assessed in leaf and root extracts, by measuring the activity of the unphosphorylated active form (NRact), the maximal extractable activity (NRmax) and the activation state. T...
Effects of soil drying and subsequent re-watering on the activity of nitrate re...
Azedo-Silva, João; Osório, Júlio; Fonseca, Filomena; Correia, Maria JoãoThe effects of drought on the activity of nitrate reductase (NR) were studied in Helianthus annuus L. plants subjected to soil drying and subsequent rewatering. Drought did not negatively affect the activation state of NR, but resulted in linearly correlated decreases in the activity of the unphosphorilated active form and the total activity of NR, both in roots and leaves. The concentration of nitrate in roots...
Photosynthetic responses of Lupinus albus to soil water fluctuations
Barrote, Isabel; Osório, Maria Leonor; Osório, Júlio; David, Maria Manuela; Correia, Maria JoãoLupinus albus plants were grown in 3 dm3 pots in a semi-controled greenhouse. Two water regimes were imposed: water deficit (S, 47% of soil capacity), and control (T, 86% of soil capacity). Plants water status was monitored through foliar relative water content (TRA) and pre-dawn (ypd) and midday water potential (ymd). Gas exchanges, chlorophyll a fluorescence and photosynthetic capacity (Amax) were measured. P...
Response to seasonal drought in three cultivars of Ceratonia siliqua: leaf grow...
Correia, Maria João; Coelho, Dulce; David, Maria ManuelaThe responses of leaf growth and leaf water relations to seasonal drought were monitored, during two successive years, in three cultivars of Ceratonia siliqua L. growing in the field, in the South of Portugal. In leaves from the current year growth bulk leaf water relations parameters were characterised using pressure-volume analysis, and morphometric measurements of xylem in petioles were undertaken. The three...
Alterações sazonais da fotossíntese e do ciclo das xantófilas em alfarrobeira (...
Barrote, Isabel; Correia, Maria João; David, Maria ManuelaThis study aimed to follow the seasonal changes in the photosynthetic performance of two Ceratonia siliqua cultivars – Mulata and Mulata do Espargal – growing in a non-irrigated orchard in Algarve (South Portugal). Measurements and sampling (leaf water potential, leaf gas exchange, pigments and dark-adapted chlorophyll fluorescence) were taken in days with similar photon flux density, during the dry season in J...
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