158 documents found, page 1 of 16

COVID-19 e DPOC: qual o impacto nos indicadores dos cuidados de saúde primários...

Introdução: A pandemia COVID-19 trouxe desafios e dificuldades que impactaram o sistema de saúde, nomeadamente a gestão e o diagnóstico da doença pulmonar obstrutiva crónica (DPOC) nos cuidados de saúde primários (CSP). Objetivos: Refletir sobre o impacto da pandemia da COVID-19 na gestão da DPOC nos CSP. Métodos: Analisaram-se os indicadores de DPOC disponíveis publicamente entre Dez/2018 e Fev/2020 (pré-pande...

Strawberry Tree Fruit Residue as Carbon Source Towards Sustainable Fuel Biodesu...

ABSTRACT: Biodesulfurization (BDS) is a clean technology that uses microorganisms to efficiently remove sulfur from recalcitrant organosulfur compounds present in fuels (fossil fuels or new-generation fuels resulting from pyrolysis and hydrothermal liquefaction). One of the limitations of this technology is the low desulfurization rates. These result in the need for greater amounts of biocatalyst and lead to in...

New Insights on Gordonia alkanivorans Strain 1B Surface-Active Biomolecules: Go...

ABSTRACT: Biosurfactants/bioemulsifiers (BSs/BEs) can be defined as surface-active biomolecules produced by microorganisms with a broad range of applications. In recent years, due to their unique properties like biodegradability, specificity, low toxicity, and relative ease of preparation, these biomolecules have attracted wide interest as an eco-friendly alternative for several industrial sectors, escalating g...

Tailored cellulose-based flocculants for microplastics removal: mechanistic ins...

This study explores the performance of novel cellulose-derived sustainable flocculants in the flocculation of different model microplastics (MPs), including polyethylene (PE), polyethylene terephthalate (PET) and polyvinyl chloride (PVC). The influence of key parameters, such as pH, flocculant structure and concentration was evaluated by Laser Diffraction Spectroscopy (LDS) and optical microscopy to access thei...

Effect of chitosan properties and dissolution state on solution rheology and fi...

Chitosan films with potential application in triboelectric nanogenerators (TENGs) represent a promising approach to replace non-biobased materials in these innovative devices. In the present work, chitosan with varying molecular weights (MW) and degrees of deacetylation was dissolved in aqueous acetic acid (AA) at different acid concentrations. It was observed that the MW had a greater influence on the viscosit...

Optimizing lignin cationization: unveiling the impact of reaction conditions th...

Lignin, a natural and abundant biopolymer, holds great potential for cosmetic applications. However, its limited solubility and inherently negative charge restrict its use in certain formulations. This is particularly relevant for hair conditioning, where a positively charged polymer is preferred to effectively treat negatively charged damaged hair. To overcome this limitation, lignin extracted from acacia wood...

Innovative approaches to mitigating microplastic pollution in effluents and soils

Microplastic pollution represents a significant environmental challenge, as microplastics accumulate in effluents and soils, causing serious risks to ecosystems and human health. Efficient removal of these contaminants is essential to mitigate their potential adverse effects. This review summarizes and critically analyses current methods for the removal of microplastics from effluents and soils, focusing on the...

Ionic liquids toward enhanced carotenoid extraction from bacterial biomass

ABSTRACT: Carotenoids are high added-value products primarily known for their intense coloration and high antioxidant activity. They can be extracted from a variety of natural sources, such as plants, animals, microalgae, yeasts, and bacteria. Gordonia alkanivorans strain 1B is a bacterium recognized as a hyper-pigment producer. However, due to its adaptations to its natural habitat, hydrocarbon-contaminated so...

História, Educação e(m) Liberdade: contributos pedagógicos da Revolução dos Cravos

Streamlining the biodesulfurization process: development of an integrated conti...

ABSTRACT: Biodesulfurization is a biotechnological process that uses microorganisms as biocatalysts to actively remove sulfur from fuels. It has the potential to be cleaner and more efficient than the current industrial process, however several bottlenecks have prevented its implementation. Additionally, most works propose models based on direct cultivation on fuel, or batch production of biocatalysts followed ...