15 documents found, page 1 of 2

Estudo interdisciplinar de pigmentos de pinturas megalíticas do noroeste português

Os monumentos funerários megalíticos são dos vestígios arqueológicos mais impactantes do período Neolítico da Europa Atlântica pelo seu notável significado arquitetónico, social e simbólico. Muitos, encontram-se gravados e/ou pintados acentuando o seu carácter esotérico. Apesar da maioria dos estudos efetuados nestes monumentos abordar os motivos pintados e a sua distribuição no interior das criptas funerárias,...

Child's oxytocin response to mother-child interaction: The contribution of chil...

The oxytocinergic system is a primary biological system involved in regulating a child's needs for bonding and for protection from threats. It is responsive to social experiences in close relationships, though evidence across studies is not entirely consistent. Guided by previous literature, we investigated individual and environmental factors predicting and presumably affecting children's oxytocin (OT) respons...

A Multi-Analytical study of Rock Paintings from Leandro 5 Megalithic Barrow, No...

The colourant composition of a northern Portugal megalithic barrow decorated with ‘solar’ motifs was studied using a multi-analytical approach, allowing the characterisa- tion of the painting techniques, pigments and binders. The red pigment was prepared with iron oxide minerals, using vegetal oils as organic additives, while the black pigment was char- coal without any organic additives or binders. The solar m...

Integrated analytical techniques for the study of colouring materials from two ...

We have determined the composition of rock art pigments from two megalithic barrows located in the north of Portugal. The use of XRD, SEM–EDS and FT–IR spectroscopy confirmed the presence of hematite and kaolinite in the red pigments from the Eireira barrow, and kaolinite in the white pigment from the Leira das Mamas barrow. The organic composition of the pigments was studied by GC–MS, suggesting that the red s...

Albumin/asparaginase capsules prepared by ultrasound to retain ammonia

Asparaginase reduces the levels of asparagine in blood, which is an essential amino acid for the proliferation of lymphoblastic malign cells. Asparaginase converts asparagine into aspartic acid and ammonia. The accumulation of ammonia in the bloodstream leads to hyperammonemia, described as one of the most significant side effects of asparaginase therapy. Therefore, there is a need for asparaginase formulations...

Microencapsulation of citronella oil for solar-activated controlled release as ...

This study investigates the functionalization of titanium dioxide nanoparticles on the surface of polymeric microcapsules as a mean to control the release of encapsulated citronella through solar radiation. This allows for the release of a mosquito repellent without human intervention, as the sunlight works as a release activator. The TiO2 nanoparticles were synthetized using a modified sol–gel and hydrothermal...

Ancient DNA in archaeological garum remains from the south of Portugal

Métodos para a determinação de fármacos em meio aquático

Size-segregated chemical composition of aerosol emissions in an urban road tunn...

An atmospheric aerosol study was performed in 2008 inside an urban road tunnel, in Lisbon, Portugal. Using a high volume impactor, the aerosol was collected into four size fractions (PM0.5, PM0.5–1, PM1–2.5 and PM2.5–10) and analysed for particle mass (PM), organic and elemental carbon (OC and EC), polycyclic aromatic hydrocarbons (PAH), soluble inorganic ions and elemental composition. Three main groups of com...

Determinação de iprovalicarbe em vinhos verdes por LC-MS