M. Margarida Costa

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The effects of light-limitation stress were investigated in natural stands of the seagrasses Zostera marina and Cymodocea nodosa in Ria Formosa coastal lagoon, southern Portugal. Three levels of light attenuation were imposed for 3 weeks in two adjacent meadows (2-3 m depth), each dominated by one species. The response of photosynthesis to light was(More)
A complete understanding of the mechanistic basis of marine ecosystem functioning is only possible through integrative and interdisciplinary research. This enables the prediction of change and possibly the mitigation of the consequences of anthropogenic impacts. One major aim of the European Cooperation in Science and Technology (COST) Action ES0609(More)
Ocean acidification is a major threat for marine life but seagrasses are expected to benefit from high CO2. In situ (long-term) and transplanted (short-term) plant incubations of the seagrass Cymodocea nodosa were performed near and away the influence of volcanic CO2 vents at Vulcano Island to test the hypothesis of beneficial effects of CO2 on plant(More)
Transthyretin (TTR) is a carrier for thyroid hormones and retinol binding protein. Several mutated forms of TTR cause familial amyloidotic polyneuropathy, an inheritable lethal disease. On the other hand, wild-type TTR has a protective role against Alzheimer’s disease. Despite its overall importance in normal animal physiology and in disease, few studies(More)
Consumption of chemicals during ECF bleaching of kraft pulp correlates reasonably well with kappa number, which measures with KMnO4 the total amount of oxidizable material in the pulp. However, the method does not distinguish between the oxidizable material in residual lignin and other structures susceptible to oxidation, such as hexenuronic acids (HexAs),(More)
Here we present the results of a multiple organizational level analysis conceived to identify acclimative/adaptive strategies exhibited by the seagrass Posidonia oceanica to the daily fluctuations in the light environment, at contrasting depths. We assessed changes in photophysiological parameters, leaf respiration, pigments, and protein and mRNA expression(More)
The alternatives used for minimizing the usage of chlorine dioxide in bleaching sequences included a hot acid hydrolysis (Ahot) stage, the use of hot chlorine dioxide (Dhot) and ozone stages at medium consistency and high consistency (Zmc and Zhc), in addition to stages with atmospheric hydrogen peroxide (P) and pressurized hydrogen peroxide (PO). The(More)
Six-year-old Levisticum officinale (lovage) hairy root cultures were used to study the effect of eight different NH4 +:NO3 − ratios on their growth and volatile components. All cultures were kept at 24°C on orbital shakers at 80 rpm, in darkness or in a 16 h light/8 h dark photoperiod. Growth was evaluated by dry and fresh weight determination. The(More)
Citation: Costa MM, Barrote I, Silva J, Olivé I, Alexandre A, Albano S and Santos R (2015) Epiphytes Modulate Posidonia oceanica Photosynthetic Production, Energetic Balance, Antioxidant Mechanisms, and Oxidative Damage. Front. Mar. Sci. 2:111. doi: 10.3389/fmars.2015.00111 Epiphytes Modulate Posidonia oceanica Photosynthetic Production, Energetic Balance,(More)
We investigated the minimal condition for symmetry breaking in morphogenesis of cellular population using cellular automata based on reactiondiffusion dynamics. We started to understand the morphogenic process and provide the mathematical formulations of the fields associated with cellular activity, environmental structure and dynamics, and mutual influence(More)