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Institution

University of Lisbon

EducationLisbon, Lisboa, Portugal
About: University of Lisbon is a education organization based out in Lisbon, Lisboa, Portugal. It is known for research contribution in the topics: Population & European union. The organization has 19122 authors who have published 48503 publications receiving 1102623 citations. The organization is also known as: Universidade de Lisboa & Lisbon University.


Papers
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Journal ArticleDOI
TL;DR: Electrospray mass spectrometry has been used to study metal ion interactions with a set of flavonoids from different classes, establishing for flavones and for the flavanone naringenin that the binding metal sites are preferentially at the 5-hydroxyl and 4-oxo groups.

294 citations

Journal ArticleDOI
TL;DR: In this article, the gallium doped zinc oxide thin films have been deposited at high growth rates by r.f. magnetron sputtering at room temperature on inexpensive soda lime glass substrates.

294 citations

Journal ArticleDOI
TL;DR: The existence of localized modes supported by the PT-symmetric nonlinear lattices is reported in this article, and the system considered reveals unusual properties: unlike other typical dissipative systems, it possesses families (branch) of solutions, which can be parametrized by the propagation constant.
Abstract: The existence of localized modes supported by the $\mathcal{PT}$-symmetric nonlinear lattices is reported. The system considered reveals unusual properties: unlike other typical dissipative systems, it possesses families (branches) of solutions, which can be parametrized by the propagation constant; relatively narrow localized modes appear to be stable, even when the conservative nonlinear lattice potential is absent; and finally, the system supports stable multipole solutions.

294 citations

Journal ArticleDOI
TL;DR: A global tree mortality map is updated and a roadmap to a more holistic understanding of forest mortality across scales is presented to achieve scientific understanding for realistic predictions of drought-induced tree mortality.
Abstract: Accumulating evidence highlights increased mortality risks for trees during severe drought, particularly under warmer temperatures and increasing vapour pressure deficit (VPD). Resulting forest die-off events have severe consequences for ecosystem services, biophysical and biogeochemical land–atmosphere processes. Despite advances in monitoring, modelling and experimental studies of the causes and consequences of tree death from individual tree to ecosystem and global scale, a general mechanistic understanding and realistic predictions of drought mortality under future climate conditions are still lacking. We update a global tree mortality map and present a roadmap to a more holistic understanding of forest mortality across scales. We highlight priority research frontiers that promote: (1) new avenues for research on key tree ecophysiological responses to drought; (2) scaling from the tree/plot level to the ecosystem and region; (3) improvements of mortality risk predictions based on both empirical and mechanistic insights; and (4) a global monitoring network of forest mortality. In light of recent and anticipated large forest die-off events such a research agenda is timely and needed to achieve scientific understanding for realistic predictions of drought-induced tree mortality. The implementation of a sustainable network will require support by stakeholders and political authorities at the international level.

293 citations

Journal ArticleDOI
TL;DR: Hyperhomocysteinaemia has been regarded as a new modifiable risk factor for atherosclerosis and vascular disease and a link has been postulated between homocysteine, or its intermediates, and an alterated DNA methylation pattern.
Abstract: Hyperhomocysteinaemia has been regarded as a new modifiable risk factor for atherosclerosis and vascular disease. Homocysteine is a branch-point intermediate of methionine metabolism, which can be further metabolised via two alternative pathways: degraded irreversibly through the transsulphuration pathway or remethylated to methionine by the remethylation pathway. Both pathways are B-vitamin-dependent. Plasma homocysteine concentrations are determined by nongenetic and genetic factors. The metabolism of homocysteine, the role of B vitamins and the contribution of nongenetic and genetic determinants of homocysteine concentrations are reviewed. The mechanisms whereby homocysteine causes endothelial damage and vascular disease are not fully understood. Recently, a link has been postulated between homocysteine, or its intermediates, and an alterated DNA methylation pattern. The involvement of epigenetic mechanisms in the context of homocysteine and atherosclerosis, due to inhibition of transmethylation reactions, is briefly overviewed.

292 citations


Authors

Showing all 19716 results

NameH-indexPapersCitations
Joao Seixas1531538115070
A. Gomes1501862113951
Marco Costa1461458105096
António Amorim136147796519
Osamu Jinnouchi13588586104
P. Verdier133111183862
Andy Haas132109687742
Wendy Taylor131125289457
Steve McMahon13087878763
Timothy Andeen129106977593
Heather Gray12996680970
Filipe Veloso12888775496
Nuno Filipe Castro12896076945
Oliver Stelzer-Chilton128114179154
Isabel Marian Trigger12897477594
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
2023247
2022827
20214,520
20204,517
20193,810
20183,617