6 documents found, page 1 of 1
Avaliação de novos compostos para desinfeção intracanal em Endodontia
Devesas, D.; Sousa, R.; Correia, B.; Esteves, A. C.; Duarte, A. S.; Noites, R.Os oceanos contêm inúmeros habitats específicos diferentes, sendo necessário que os microrganismos desenvolvam diferentes mecanismos de adaptação para sobreviverem. Alguns destes são a produção de biomoléculas e enzimas específicas que lhes conferem propriedades antibacterianas, antifúngicas, antiinflamatórias, antiprotozoárias, antivirais, anticancerígenas, relevantes agentes infeciosos em endodontia. O objeti...
Photodynamic inactivation of Lasiodiplodia theobromae: lighting the way towards...
Garcia, M.; David, B.; Sierra-Garcia, I. N.; Faustino, M. A. F.; Alves, A.; Esteves, A. C.; Cunha, A.The fungus Lasiodiplodia theobromae is one of the main causal agents of trunk canker and dieback of grapevine. The objective of this work was to evaluate the efficiency of photodynamic inactivation (PDI) of L. theobromae with synthetic and natural photosensitizers and irradiation with either sunlight or artificial photosynthetically active radiation. Although the growth of the mycelium could not be completely p...
Three new species of Neocamarosporium isolated from saline environments: N. aes...
Gonçalves, M. F. M.; Aleixo, A.; Vicente, T. F. L.; Esteves, A. C.; Alves, A.Neocamarosporium species are typically halotolerant, being commonly found in saline environments like saline water, hypersaline soils and especially in association with halophytes. Several isolates were obtained from saline water, dead leaves of the seaweed Zostera noltii and live tissues of the halophyte Halimione portulacoides. Phylogenetic analysis based on ITS sequence data placed these isolates into three ...
Aeromonas piscicola AH-3 expresses an extracellular collagenase with cytotoxic ...
Duarte, A. S.; Cavaleiro, E.; Pereira, C.; Merino, S.; Esteves, A. C.; Duarte, E. P.; Tomás, J. M.; Correia, A. C.The aim of this study was to investigate the presence and the phenotypic expression of a gene coding for a putative collagenase. This gene (AHA_0517) was identified in Aeromonas hydrophila ATCC 7966 genome and named colAh. We constructed and characterized an Aeromonas piscicola AH-3::colAh knockout mutant. Collagenolytic activity of the wild-type and mutant strains was determined, demonstrating that colAh encod...
Synthesis of SiO2-coated Bi2S3/poly(styrene) nanocomposites by in-situ polymeri...
Esteves, A. C.; Neves, M. C.; Barros-Timmons, A.; Bourgeat-Lami, E.; Liz-Marzán, L.; Trindade, T.New nanocomposites containing silica-coated Bi2S3 nanofibers were synthesised by in situ polymerization using two distinct synthetic strategies: emulsion and suspension polymerization. Transmission and scanning electron microscopy of the nanocomposite particles showed that in both cases the Bi2S3/SiO2 nanoparticles were densely coated with poly(styrene). In situ emulsion polymerization afforded nanocomposites i...
A green-emitting CdSe/poly(butyl acrylate) nanocomposite
Peres, M.; Costa, L. C.; Neves, A.; Soares, M. J.; Monteiro, T.; Esteves, A. C.; Barros-Timmons, A.; Trindade, T.; Kholkin, A.; Alves, E.CdSe/poly(butyl acrylate) nanocomposites were synthesized by in situ miniemulsion polymerization. The hybrid nanomaterial is very stable and presents a bright green photoluminescence at 2.29 eV under ultraviolet excitation. With the excitation conditions used the intensity of the emission band keeps nearly constant from 7 K to room temperature. The morphological, structural and room temperature electrical prope...