13 documents found, page 1 of 2
Novel tetradentate N2O2 water-soluble Schiff Base and its Al(III) complex: synt...
Bouznif, Hajer; Justino, Licínia L. G.; Soares, Maria I. L.; Costa, Telma; Ramos, Maria Luisa; Nikitin, Timur; Pinho e Melo, Teresa M. V. D.A novel water-soluble di-Schiff base, N,N’-bis(3-methoxy-5-sulfonatosalicylidene)-1,2- ethylenediamine disodium salt (MSS), was synthesized under both conventional heating and microwave-assisted conditions. Detailed characterization was conducted using various techniques including NMR, HRMS, UV_vis, SEM/EDX, DSC, ATR-FTIR and Raman spectroscopies, accompanied by DFT calculations. The study discusses the enol-im...
Influence of Different Agro-Food Waste on Ammonia and Greenhouse Gas Emissions ...
Pereira, José; Costa, Telma; Figueiredo, Vítor; Marques, Francisco; Perdigão, Adelaide; Brás, Isabel; Ferreira Silva, Maria ElisabeteComposting is one of the best organic waste management techniques, with zero waste; however, it generates environmental impacts. The objective of this study was to evaluate the emission of NH3, N2O, CO2, and CH4 from the composting of olive, elderberry, and grape agro-food waste. The experiment was carried out using reactors receiving straw as control and three treatments receiving mixtures of straw and olive, ...
Solvent-Driven Self-Organization of Meso-Substituted Porphyrins: Morphological ...
Costa, Telma; Peixoto, Mariana; Pineiro, Marta; Melo, J. Sérgio Seixas deA morphological analysis of different thin films of meso-tetra-p-(di-p-phenylamino)phenylporphyrin, H2T(TPA)4P, was made by fluorescence lifetime imaging microscopy (FLIM) and scanning electron microscopy (SEM). A comprehensive study of H2T(TPA)4P was undertaken through UV/vis absorption and fluorescence techniques in different solvents, solvent mixtures and in thin films. In solution, occurrence of intramolecu...
Highly Selective Fluorescent Sensors: Polyethylenimine Derivatives of Triphenyl...
Delgado Pinar, Estefanía; Medeiros, Matilde; Costa, Telma; Melo, J. Sérgio Seixas deChemical derivatives of polyethylenimine (PEI) receptors with either triphenylamine (TPA) or 7-hydroxy-4-methyl-coumarin (Cou) form stable complexes with adenine and guanine nucleotides in water. The host-guest complex modulation is found to be based on noncovalent molecular interactions such as π-π stacking and hydrogen bonding, which are dependent on the aromatic moieties attached to the polyaminic (PEI) back...
Cdkn2a inactivation promotes malignant transformation of mouse immature thymocy...
Catarino, Telmo A.; Pacheco-Leyva, Ivette; Kindi, Faiza Al; Ghezzo, Marinella N.; Fernandes, Mónica T.; Costa, Telma; Rodrigues Dos Santos, NunoCDKN2A deletion is the most frequent genetic alteration in T-cell acute lymphoblastic leukemia (T-ALL), occurring across all molecular and immunophenotypic subtypes. CDKN2A encodes two functionally unrelated tumor suppressor proteins, ARF and INK4a, which are critical regulators of cell cycle and proliferation. Arf has been reported to suppress T-ALL development in post−b-selection thymocytes, but whether CDKN2...
Oxocomplexes of U(vi) with 8-hydroxyquinoline-5-sulfonate in solution: structur...
Ramos, M. Luísa; Simões, Licínia de Lurdes Gomes Justino; Barata, Rui Pedro Rodrigues de Morais; Costa, Telma; Nogueira, Bernardo AlbuquerqueMultinuclear (1H and 13C) NMR, and Raman spectroscopy, combined with DFT calculations, provide detailed information on the complexation between U(vi) oxoions and 8-hydroxyquinoline-5-sulfonate (8-HQS) in aqueous solution. Over the concentration region studied, U(vi) oxoions (uranyl ions) form one dominant complex with 8-HQS in water in the pH range 3-6, a mononuclear 1 : 2 (metal : ligand) complex, with the met...
Peixes das Berlengas: Manual ilustrado da ictiofauna das Berlengas
Costa, Telma; Mouga, Teresa; Maranhão, Paulo; Leandro, SérgioEste guia ilustrado, muito acessível mesmo para o leigo, apresenta, depois de uma nota introdutória sobre as Berlengas, um conjunto de informação de base simples e bem estruturada, que nos permite entender facilmente as principais características de cada grupo, seguindo-se, de forma concisa, a morfologia e a distribuição geográfica de cada espécie.
Association of a Hydrophobically Modified Polyelectrolyte and a Block Copolymer...
Costa, Telma; Schillén, Karin; Miguel, Maria da G.; Lindman, Björn; Melo, J. Seixas deBy using absorption and fluorescence (steady-state and time-resolved) techniques, the interaction between a poly(acrylic acid) (PAA), randomly grafted with pyrene (Py) units (PAAMePy55), and a triblock copolymer of poly(ethylene oxide) and poly(propylene oxide) (EO20PO68EO20, P123) was investigated. From the fluorescence data, it is shown that upon addition of P123 a decrease of the (pyrene−pyrene, Py−Py) intra...
Complex Formation between a Fluorescently-Labeled Polyelectrolyte and a Tribloc...
Costa, Telma; Melo, J. Seixas de; Miguel, Maria da G.; Lindman, Björn; Schillén, KarinThe association between a randomly pyrene labeled PAA polymer (PAAMePy55) and a PEO−PPO−PEO triblock copolymer (P123) in aqueous solutions of different NaCl concentrations and pHs has been studied by means of dynamic light scattering (DLS) and steady-state fluorescence spectroscopy at 40 °C. At acidic pH values, in the low P123/PAAMePy55 molar ratio regime (i.e., at low P123 concentrations), the relaxation time...
A resonance Rayleigh scattering study of unlabeled and pyrene-labeled poly(acry...
Costa, Telma; Seixas de Melo, J.http://www.sciencedirect.com/science/article/B6TGS-4TVTK04-4/2/52a09901f70ff2c94360af23956381c5