26 documents found, page 1 of 3
Hybrid matched filter detection spectrum sensing
Brito, A.; Sebastião, P.; Velez, F. J.The radio frequency spectrum is getting more congested day by day due to the growth of wireless devices, applications, and the arrival of fifth generation (5G) mobile communications. This happens because the radio spectrum is a natural resource that has a restricted existence. Access to all devices can be granted, but in a more efficient way. To resolve the issue, cognitive radio technology has come out as a wa...
Biogeographical history of the genus Atherina (Pisces: Atherinidae) in the cent...
Borges, Sergio Moreno; Brito, A.; Francisco, S. M.The biogeographical history of Macaronesian and South African sand-smelt is approached for the first time with the inclusion of A. lopeziana in the genus’ phylogenetic analysis, using a fragment of the mitochondrial control region. The fossil-calibrated phylogeny revealed an early process of vicariance close to the estimated age of Atherina (~ 19 Mya) leading to two old clades separating European from South Afr...
Minimalistic supramolecular proteoglycan mimics by co-assembly of aromatic pept...
Brito, A.; Abul-Haija, Y. M.; Soares da Costa, D.; Novoa-Carballal, Ramon; Reis, R. L.; Ulijn, R. V.; Pires, R. A.; Pashkuleva, I.We report the co-assembly of aromatic carbohydrate and dipeptide amphiphiles under physiological conditions as a strategy to generate minimalistic proteoglycan mimics. The resulting nanofibers present a structural, fluorenylmethoxycarbonyl-diphenylalanine (Fmoc-FF) core and a functional carbohydrate (Fmoc-glucosamine-6-sulfate or -phosphate) shell. The size, degree of bundling and mechanical properties of the a...
Sweet building blocks for selfassembling biomaterials with molecular recognition
Brito, A.; Reis, R. L.; Pires, R. A.; Pashkuleva, I.After billions of years of evolution not a single live cell has emerged that does not cover itself with a dense code of glycans: carbohydrates are involved in all essential processes within the life cycle of cells and organisms. They exercise their bioactivities via simultaneous multivalent non-covalent interactions with other biomolecules such as proteins. Supramolecular polymers are ideal systems to generate ...
CARB 113: Co-assembly of peptide and carbohydrate amphiphiles to generate prote...
Brito, A.; Abul-Haija, Y. M.; Soares da Costa, D.; Novoa-Carballal, Ramon; Reis, R. L.; Ulijn, R. V.; Pires, R. A.; Pashkuleva, I.Peptide amphiphiles (PA) have been used as building blocks that generate nanofibrous protein mimics through self-assembly under physiological conditions. These supramolecular structures are maintained by non-covalent interactions, such as, Pi-Pi stacking, hydrogen bonding and hydrophobic effects. The generated fibers can be further crosslinked via salt bridges thus forming hydrated systems that resemble the ext...
Short carbohydrate amphiphiles as smart therapeutics targeting cancer
Brito, A.; Soares da Costa, D.; Carvalho, A. F.; Reis, R. L.; Ulijn, R. V.; Pires, R. A.; Pashkuleva, I.Biocatalytic self-assembly (BSA) emerged as selective and effective approach for cancer therapy. BSA makes use of enzyme-sensitive moiety that is incorporated in an amphiphilic molecule (usually peptide amphiphile, PA). This unit is transfomred/removed upon enzymatic action causing rebalance of the moleculeâ s amphiphilicity and self-assembling ability. Among different enzymes, phosphatases (e.g. alkaline phosp...
New and confirmed records of fishes from the Cabo Verde archipelago based on ph...
Freitas, Rui; Falcón, J. M.; González, José A.; Burnett, K. A.; Dureuil, M.; Caruso, J. H.; Hoving, H. J. T.; Brito, A.In recent decades the Cabo Verde ichthyofauna has been studied more extensively, and nowadays photo-recording is employed as a valuable asset under special caution and consideration. Four species reported here are new records for Cabo Verde: Carlarius sp., sea catfish; Serranus cabrilla, comber; Branchiostegus semifasciatus, African tilefish and Lutjanus dentatus, African coastal snapper. The presence in Cabo V...
Revisão e reconciliação terapêutica em hospitalização domiciliária
Brito, A.; Simões, A.; Costa, F. A.; Alcobia, A.
Establishment of a coastal fish in the Azores: recent colonisation or sudden ex...
Stefanni, S.; Castilho, Rita; Sala-Bozano, M.; Robalo, J. I.; Francisco, S. M.; Santos, R. S.; Marques, N.; Brito, A.; Almada, V. C.; Mariani, S.The processes and timescales associated with ocean-wide changes in the distribution of marine species have intrigued biologists since Darwin's earliest insights into biogeography. The Azores, a mid-Atlantic volcanic archipelago located >1000 km off the European continental shelf, offers ideal opportunities to investigate phylogeographic colonisation scenarios. The benthopelagic sparid fish known as the common t...
Validation of standard and alternative satellite ocean-color chlorophyll produc...
Sá, Carolina; D'Alimonte, Davide; Brito, A.; Kajiyama, T.; Mendes, C. R.; Vitorino, J.; Oliveira, P. B.; da Silva, J. C. B.; Brotas, V.Chlorophyll a concentration (Chl) product validation off theWestern Iberian coast is here undertaken by directly comparing remote sensing data with in situ surface reference values. Both standard and recently developed alternative algorithms are considered for match-up data analysis. The investigated standard products are those produced by the MERIS (algal 1 and algal 2) and MODIS (OC3M) algorithms. The alterna...