91 documents found, page 1 of 10

Stream sediment pollution: a compositional baseline assessment

A high concentration of potentially toxic elements (PTEs) can affect ecosystem health in many ways. It is therefore essential that spatial trends in pollutants are assessed and monitored. Two questions must be addressed when quantifying pollution: how to define a non-polluted sample and how to reduce the problem’s dimensionality. A geochemical dataset is a composition of variables (chemical elements), where the...

Evaluation of antitumor activity of xanthones conjugated with amino acids

Background: Cancer is a complex disease characterized by several alterations that confer on the cells, the capacity to proliferate uncontrollably and to resist cellular death. Multiresistance to conventional chemotherapy drugs is often the cause of treatment failure; thus, the search for natural products or their derivatives with therapeutic action is essential. Chiral derivatives of xanthones (CDXs) have ...

Projetos de literacia ambiental em Portugal [poster]

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Stream sediment pollution: a compositional baseline assessment

A high concentration of potentially toxic elements (PTEs) can affect ecosystem health in many ways. It is therefore essential that spatial trends in pollutants are assessed and monitored. Two questions must be addressed when quantifying pollution: how to define a non-polluted sample and how to reduce the problem’s dimensionality. A geochemical dataset is a composition of variables (chemical elements), where the...

Attendance to university and changes in the eating habits of young adults: a pr...

Service Delight and Brand Love: Its’ Impact on Premium Price and Word-of-Mouth

Organizations have come to realize that beyond satisfaction, customers desire an emotional attachment with brands, developing true love or hate feelings towards them. Now, can this feeling be visible in the intangibility of the services sector? This research has focused on Brand Love and its’ relationship with customer delight when services are concerned. Three specific dimensions were explored: the physical en...

The importance of ethical reasoning in next generation tech education

Artificial intelligence (AI) is having a profound impact on human life, with both benefits and drawbacks in the societal, environmental, and technological realms. However, the ethical implications of AI are often not addressed in technology education, leaving future professionals with a lack of awareness in this area. This is concerning, as AI has the potential to greatly information delivery and affect human t...

Synthesis and anti-inflammatory evaluation of a library of chiral derivatives o...

In recent decades, the relationship between drug chirality and biological activity has been assuming enormous importance in medicinal chemistry. Particularly, chiral derivatives of xanthones (CDXs) have interesting biological activities, including enantioselective anti-inflammatory activity. Herein, the synthesis of a library of CDXs is described, by coupling a carboxyxanthone (1) with both enantiomers of prote...

Environmental factors and metals mobilisation in alluvial sediments - Minas Ger...

In areas contaminated by potentially toxic elements (PTEs), knowledge of processes of metal mobilisation is the basis for the choice of appropriate remediation methodologies. The mobilisation of metals is a function of several factors and the response to these factors must be well known during the planning of remediation strategies. The activity of an ore metallurgical plant in SE Brazil resulted in major conta...

Importance of the Spatial Distribution of Rare Earth Elements in the Bottom Sed...

The geochemical composition of rare earth elements (REE) in the bottom sediments of two Do-minican reservoirs and in soils from their catchments was studied to identify possible sources of the deposited materials. Knowledge of the origin of the sediments will serve to control the ex-cessive rates of erosion and sedimentation that occur annually due to periodic extreme climatic events that promote excessive silt...