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Time-domain optimization of amplifiers based on distributed genetic algorithms

Thesis presented in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the subject of Electrical and Computer Engineering ; The work presented in this thesis addresses the task of circuit optimization, helping the designer facing the high performance and high efficiency circuits demands of the market and technology evolution. A novel framework is introduced, based on time-domain ...

Diversity and fruiting pattern of macrofungi associated with chestnut tree (Cas...

The chestnut (Castanea sativa) agro-ecosystem is of great social, economic and landscape importance in NE Portugal. There are multiple resources associated with this crop, among them fruit and wood production and mushroom harvesting. However, information about the diversity and ecology of macrofungi is very scarce. In this context, the aim of this study was to assess the macrofungal diversity associated with ch...

Interaction between Hypholoma fasciculare and the ectomycorrhizal fungus Pisoli...

In the past few years, cord-forming basidiomycetes have received considerable attention in their growth strategies in the presence of other fungi (saprotrophic and pathogenic). In the present study, the in vitro interaction between the cord-forming basidiomycete Hypholoma fasciculare and the ectomycorrhizal fungus Pisolithus tinctorius was studied. Dual-cultures were established and the radial fungal growth, hy...

Involvement of reactive oxygen species during early stages of ectomycorrhiza es...

Evidence for the participation of reactive oxygen species (ROS) and antioxidant systems in ectomycorrhizal(ECM) establishment is lacking. In this paper, we evaluated ROS production and the activities of superoxide dismutase (SOD) and catalase (CAT) during the early contact of the ECM fungus Pisolithus tinctorius with the roots of Castanea sativa (chestnut tree). Roots were placed in contact with P. tinctorius m...

Macrofungi associated with sweet chestnut: a source of income for rural populat...

European chestnut tree (Castanea sativa Mill.) has a great economic interest for wood and fruit production in northeast of Portugal. Over the last decade another important income associated with this culture has emerged - the collection and commercialization of wild edible mushrooms growing in chestnut orchards. Actually, despite the low knowledge of their biodiversity, ecology or sustainable management in thos...

Efeito de extractos de raízes eliciadas de Castanea sativa no crescimento do fu...

O castanheiro (Castanea sativa Mill.) estabelece associação com numerosas espécies de fungos ectomicorrízicos, estando descritos os efeitos benéficos para a planta após micorrização com Pisolithus tinctorius. Neste processo é essencial que ocorra a troca de sinais entre os simbiontes, para que seja reconhecida a sua compatibilidade e para que ocorra a formação dos órgãos ectomicorrízicos. Neste trabalho são for...

Efeito de extractos de raízes eliciadas de Castanea sativa no crescimento do fu...

In vitro evidences of mycoparasitism of the ectomycorrhizal fungus Pisolithus t...

In the northeast of Portugal macrofungi community associated to chestnut tree (Castanea sativa Mill.) is rich and diversified. Among fungal species, Pisolithus tinctorius and Hypholoma fasciculare are common in this habitat. In vitro interaction between P. tinctorius and H. fasciculare was investigated, to ascertain the potential mycoparasitic capabilities of H. fasciculare in the growth suppression of ectomyco...

Signalling process during the early contact of ectomycorrhizal fungi Pisolithus...

Macrofungi associated with Castanea sativa in the Northeast of Portugal. Temper...

Macrofungal fructification is a seasonal event related with environmental factors, such as temperature and rainfall. A relationship with climatic factors and sporocarps production has been established but these correlations differs considerably from environment to environment. In this context the present work aims were i) to known the macrofungal community associated with chestnut tree, Castanea sativa Mill. an...