7 documents found, page 1 of 1
Efeito do bicarvão e pó de serra na disponibilidade dos nutrientes, crescimento...
Guimarães, RodrigoO Latossolo e a principal classe de solos da região Amazonas, possuindo a característica de baixa fertilidade, o biocarvão somado as doses crescentes de pó de serra podem contribuir para a melhoria dos atributos químicos e físicos desses solos. O objetivo deste trabalho foi avaliar a influência do biocarvão e pó de serra na disponibilidade de nutrientes proveniente de fertilizantes minerais. O experimento foi c...
Preparation and characterization of polysaccharides/PVA blend nanofibrous membr...
Santos, Carla; Silva, Carla J. S. M.; Büttel, Zsófia; Guimarães, Rodrigo; Pereira, Sara B.; Tamagnini, Paula; Zille, AndreaA series of polyvinyl alcohol (PVA), PVA/chitosan (CS) and PVA/cyanobacterial extracellular polymeric substances (EPS) blended nanofibrous membranes were produced by electrospinning using a microfiltration poly(vinylidene fluoride) (PVDF) basal membrane, for potential applications in water filtration. Nanofibres were obtained from solutions of 20% (w/w) PVA with 1% (w/w) CS or EPS, using a weight ratio of 60/40...
Alkali and acid polysaccharides blend nanofibrous membranes prepared by electro...
Santos, Carla; Silva, Carla J. S. M.; Büttel, Zsófia; Guimarães, Rodrigo; Tamagnini, Paula; Zille, AndreaElectrospinning allows the production of polymer fibres with diameters in the sub-micron size range, through the application of an external electric field, keeping intact the bulk properties of the polymers. Electrospun membranes possess some unique structural features, such as a high surface to volume ratio and very good mechanical performance, properties that are determinant to their use in several applicatio...
Fabrication and characterization of PVA, PVA/chitosan, and PVA/cyanobacterial e...
Santos, Carla; Silva, Carla J. S. M.; Guimarães, Rodrigo; Büttel, Zsófia; Tamagnini, Paula; Zille, AndreaA series of poly(vinyl alcohol) (PVA), PVA/chitosan (CS) and PVA/cyanobacterial exopolysaccharide (EPS) blend nanofibrous membranes were fabricated by electrospinning using a microfiltration poly(vinylidene fluoride) (PVDF) as a basal membrane, in order to obtain thin-layer composite (TFC) nanofiltration membranes. The morphology, diameter, structure, mechanical and thermal characteristics of electrospun nanofi...
Thin-layer nanofiltration membranes using engineered biopolymers for seawater d...
Büttel, Zsófia; Guimarães, Rodrigo; Santos, Carla; Silva, Carla J. S. M.; Pereira, Sara B.; Mota, Rita; Tamagnini, Paula; Zille, AndreaNowadays water demand already exceeds supply and water scarcity is a global problem. So it is necessary to develop novel technologies to be able to use poorer quality source waters for drinking water production. Once considered as an expensive, ultimate solution for water supply, desalination is becoming affordable. The two most commonly used seawater desalination methods are Multi-stage Flash Distillation (MSF...
Production and characterization of extracellular carbohydrate polymer from Cyan...
Mota, Rita; Guimarães, Rodrigo; Büttel, Zsófia; Rossi, Federico; Colica, Giovanni; Silva, Carla J. S. M.; Santos, Carla; Gales, Luís; Zille, AndreaCyanobacterial extracellular polymeric substances (EPS) are heteropolysaccharides that possess characteristics suitable for industrial applications, notably a high number of different monomers, strong anionic nature and high hydrophobicity. However, systematic studies that unveil the conditions influencing EPS synthesis and/or its characteristics are mandatory. In this work, Cyanothece sp. CCY 0110 was used as ...
Modulation of poly-N-acetylglucosamine accumulation within mature Staphylococcu...
Cerca, Filipe; França, Ângela; Guimarães, Rodrigo; Hinzmann, Mariana; Cerca, Nuno; Cunha, Alexandre Lobo da; Azeredo, Joana; Vilanova, ManuelPNAG is a major component of Staphylococcus epidermidis biofilms involved in intercellular adhesion as well as in the interaction of the biofilm with components of the host immune response. Synthesis of PNAG has been found to be regulated by several environmental factors. In the present study, the effect of glucose metabolism-dependent culture medium acidification in PNAG accumulation was evaluated. Established...