Encontrados 8 documentos, a visualizar página 1 de 1
Satellite-derived estimation of environmental suitability for malaria vector de...
Benali, Akli; Nunes, J.P.; Freitas, F.B.; Sousa, C.A.; Novo, M.T.; Lourenço, P.M.; Lima, J.C.; Seixas, J.; Almeida, A.P.G.Malaria was endemic in Europe for more than two millennia until it was eradicated in the 1970s. Recent autochthonous cases registered in Greece have increased the awareness regarding the threat of malaria re-emergence in Southern Europe. Currently, the presence of competent vectors, suitable environmental conditions and the evidences of a changing climate may increase the widespread re-emergence of malaria in S...
Intramolecular excimer formation and sensing behavior of new fluorimetric probe...
Lodeiro, C.; Lima, J. C.; Parola, A. J.; Melo, J. S. Seixas de; Capelo, J. L.; Covelo, B.; Tamayo, A.; Pedras, B.A new family of compounds able to promote host-guest interactions with specific molecules (e.g., cyanuric and parabanic acids) and to coordinate metal ions, namely Zn(II) and Cu(II), has been synthesized and fully characterized. The new probes derive from the attachment of two methylaminopyrene units to the carbonyl precursor 2,6-bis(2-formylphenoxymethyl)pyridine. ; http://www.sciencedirect.com/science/arti...
Spectroscopy and Coordination Chemistry of a New Bisnaphthalene−Bisphenanthroli...
Pina, João; Melo, J. Seixas de; Pina, Fernando; Lodeiro, Carlos; Lima, J. C.; Parola, A. Jorge; Soriano, Conxa; Paz Clares, M.; Albelda, M. TeresaA new fluorescent macrocyclic structure (L1) bearing two naphthalene units at both ends of a cyclic polyaminic chain containing two phenanthroline units was investigated with potentiometric and fluorescence (steady-state and time-resolved) techniques. The fluorescence emission spectra show the simultaneous presence of three bands: a short wavelength emission band (naphthalene monomer), a middle emission band (...
Self-Assembly of a Hydrophobically Modified Naphthalene-Labeled Poly(acrylic ac...
Costa, Telma; Miguel, M. G.; Lindman, Björn; Schillén, Karin; Lima, J. C.; Melo, J. Seixas deThe solution properties of two water-soluble polymers, poly(acrylic acid) (PAA), covalently labeled with the fluorescent hydrophobic dye naphthalene (Np), have been investigated in water:organic solvent mixtures. The naphthalene chromophores have been randomly attached, onto the polymer, with two different degrees of labeling. Fluorescence measurements (steady-state and time-resolved) have been used to follow t...
Synthesis and H+, Cu2+, and Zn2+ Coordination Behavior of a Bis(fluorophoric) B...
Clares, M. Paz; Aguilar, Juan; Aucejo, Ricardo; Lodeiro, Carlos; Albelda, M. Teresa; Pina, Fernando; Lima, J. C.; Parola, A. Jorge; Pina, JoãoThe synthesis, protonation behavior, and Cu2+ and Zn2+ coordination chemistry of the novel bibrachial aza lariat ether (naphthalen-1-ylmethyl)[2-(20-2-[(naphthalen-1-ylmethyl)amino]ethyl-3,6,9,17,20,23,29,30-octaazatricyclo[23.3.1.1*11,15*]triaconta-1(29),11(30),12,14,25,27-hexaen-6-yl)ethyl]amine (L) are discussed. The macrocycle, which has two aminoethyl naphthyl moieties symmetrically appended to a 2:2 azapy...
Energetics and Dynamics of Naphthalene Polyaminic Derivatives. Influence of Str...
Melo, J. Seixas de; Pina, J.; Pina, F.; Lodeiro, C.; Parola, A. J.; Lima, J. C.; Teresa Albelda, M.; Paz Clares, M.; Garcia-España, EnriqueTwo new fluorescent macrocyclic structures bearing two naphthalene (Np) units at both ends of a cyclic polyaminic chain were investigated with potentiometric, fluorescence (steady-state and time-resolved) and laser flash photolysis techniques. The fluorescence emission studies show the presence of an excimer species whose formation depends on the protonation state of the polyamine chains implying the existence ...
Long Range Electron Transfer Quenching in Polyamine Chains Bearing a Terminal N...
Pina, Fernando; Lima, J. C.; Lodeiro, Carlos; Melo, J. Seixas de; Díaz, Pilar; Teresa Albelda, M.; García-España, EnriqueThe fluorescence emission of a naphthalene unit attached to a polyamine chain is quenched by intramolecular electron transfer from the deprotonated amines to the excited fluorophore. Measurements of the respective quenching rate constants as a function of the distance, reveal an exponential dependence with β = 0.45 Å-1. Identical measurements carried out in deuterated water have shown a similar dependence with ...
Electrochemical studies and square wave adsorptive stripping voltammetry of the...
Silva, A. M. S. Roque da; Lima, J. C.; Teles, M. T. Oliva; Brett, A. M. OliveiraThe electrochemical reduction of the antidepressant drug fluoxetine was investigated by cyclic, linear sweep, differential pulse and square wave voltammetry using a hanging mercury drop electrode in alkaline buffer solution in water and in a water/acetonitrile mixed solvent. Cyclic voltammograms in aqueous solution showed very strong adsorption of fluoxetine on the electrode with formation of a compact film. Th...
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