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Papers by Ana Isabel Rodrigues

Research paper thumbnail of Novel chiral P,O-ligands for homogeneous Pd(0) catalysed asymmetric allylic alkylation reactions

Tetrahedron: Asymmetry, 2008

Research paper thumbnail of Novel chiral P,O-ligands for homogeneous Pd(0) catalysed asymmetric allylic alkylation reactions

Tetrahedron: Asymmetry, 2008

Research paper thumbnail of The opposing effects of the flavonoids isoquercitrin and Sissotrin, isolated fromPterospartum tridentatum, on oral glucose tolerance in rats

Phytotherapy Research, 2008

Research paper thumbnail of Antifungal Activity of (+)-Curcuphenol, a Metabolite from the Marine Sponge Didiscus oxeata

Marine Drugs, 2004

... (00351)-21-7165141, Fax (00351) 21-7168100, E-mail: helena.gaspar@ineti.pt ... of fungal infe... more ... (00351)-21-7165141, Fax (00351) 21-7168100, E-mail: helena.gaspar@ineti.pt ... of fungal infections found in most countries, affecting skin, hair and nails [10]. While (+)-curcuphenol inhibited the growth of the fungi A. ramosa, A. niger, B. cinerea, C. ...

Research paper thumbnail of HPLC quantification of dye flavonoids in Reseda luteola L. from Portugal

Journal of Separation Science, 2008

Research paper thumbnail of Catalytic epoxidation of olefins using MoO3 and TBHP: Effect of the addition of chiral 2-substituted pyridines on the catalytic rate and asymmetric induction

Journal of Molecular Catalysis A: Chemical, 2006

Research paper thumbnail of Flavonoids of an extract of Pterospartum tridentatum showing endothelial protection against oxidative injury

Journal of Ethnopharmacology, 2004

Research paper thumbnail of Volatile composition of red clover (Trifolium pratense L.) forages in Portugal: The influence of ripening stage and ensilage

Research paper thumbnail of Direct Identification and Quantitative Determination of Acidic and Neutral Diterpenes Using <SUP>13</SUP>C-NMR Spectroscopy. Application to the Analysis of Oleoresin of <I>Pinus nigra</I>

Applied Spectroscopy, 2002

Research paper thumbnail of A first approach to chemical and mineralogical study of pigments from Lajeado Complex in Tocatins, Brazil

Summary In recent years chemical analysis has been established as a significant contributor to sc... more Summary
In recent years chemical analysis has been established as a significant contributor to science-based archaeology. The present work is a first
approach to the study of chemical and mineralogical composition of pigments used in archaeological rupestrian arts of Vão Grande site,
included in Lajeado Complex in Tocatins State, Brazil. Representative pigments micro-samples were removed from rock paintings and substrate
rock. The characterization of the pigments was carried out by micro X-ray diffraction (μ-XRD) and Fourier transform infrared microspectroscopy
(μ-FTIR).
Riassunto
Questo lavoro è un primo approccio allo studio della composizione chimica e mineralogica dei pigmenti utilizzati nel sito archeologico di arte
rupestre di Vão Grande, facente parte del complesso di Lajeado nello Stato di Tocatins, Brasile. Micro-campioni dei pigmenti sono stati rilevanti
dalle pitture rupestri e dal substrato di roccia. La caratterizzazione dei pigmenti è stata condotta con microdiffrazione dei raggi-X (μ-XRD) e
microspettroscopia a infrarossi a trasformata di Fourier (μ-FTIR).

Research paper thumbnail of Isotope geochemistry of speleothems and the Holocene climate dynamics at Natural Monument Cuevas de Fuentes de Leon region, Extremadura, Spain

A petrographic and isotopic study of a stalagmite from Los Postes cave, located at the Natural Mo... more A petrographic and isotopic study of a stalagmite from Los Postes cave, located at the Natural Monument “Cuevas de Fuentes de León”, Spain, was carried out in order to assess Holocene climate changes in the landscape of this region. The stalagmite consists of calcite, but also contains small clasts of quartz, plagioclase, zircon, "terra rossa", limestone, iron oxides and hydroxides and clay minerals. In the stalagmite, calcite columnar textures tend to yield the lowest δ18O and δ13C values, and their growth should reflect relatively slow but constant drip rates. On the other hand, layers with columnar microcrystalline and radial-acicular textures show the highest δ18O and δ13C values and are related to a decrease in the drip rate. Layers formed by aggregates of detrital materials, cemented with micrite, are associated to low drip rates or even dryness periods. However, the detrital components should have entered in the system due to torrentional transport processes. The δ18O and δ13C values co-vary, ranging from -5.17 ‰ to -2.57 ‰ and from -9.34 ‰ and -4.95 ‰, respectively. The petrographic and isotopic data point to a outset of a more dry and warm period at ca. 2.6 ka BP, with δ18O and δ13C values higher than -3.75 ‰ and -6.80 ‰, respectively, which could led to a predominance of C4 plants over C3.

Research paper thumbnail of Novel chiral P,O-ligands for homogeneous Pd(0) catalysed asymmetric allylic alkylation reactions

Tetrahedron: Asymmetry, 2008

Research paper thumbnail of Novel chiral P,O-ligands for homogeneous Pd(0) catalysed asymmetric allylic alkylation reactions

Tetrahedron: Asymmetry, 2008

Research paper thumbnail of The opposing effects of the flavonoids isoquercitrin and Sissotrin, isolated fromPterospartum tridentatum, on oral glucose tolerance in rats

Phytotherapy Research, 2008

Research paper thumbnail of Antifungal Activity of (+)-Curcuphenol, a Metabolite from the Marine Sponge Didiscus oxeata

Marine Drugs, 2004

... (00351)-21-7165141, Fax (00351) 21-7168100, E-mail: helena.gaspar@ineti.pt ... of fungal infe... more ... (00351)-21-7165141, Fax (00351) 21-7168100, E-mail: helena.gaspar@ineti.pt ... of fungal infections found in most countries, affecting skin, hair and nails [10]. While (+)-curcuphenol inhibited the growth of the fungi A. ramosa, A. niger, B. cinerea, C. ...

Research paper thumbnail of HPLC quantification of dye flavonoids in Reseda luteola L. from Portugal

Journal of Separation Science, 2008

Research paper thumbnail of Catalytic epoxidation of olefins using MoO3 and TBHP: Effect of the addition of chiral 2-substituted pyridines on the catalytic rate and asymmetric induction

Journal of Molecular Catalysis A: Chemical, 2006

Research paper thumbnail of Flavonoids of an extract of Pterospartum tridentatum showing endothelial protection against oxidative injury

Journal of Ethnopharmacology, 2004

Research paper thumbnail of Volatile composition of red clover (Trifolium pratense L.) forages in Portugal: The influence of ripening stage and ensilage

Research paper thumbnail of Direct Identification and Quantitative Determination of Acidic and Neutral Diterpenes Using <SUP>13</SUP>C-NMR Spectroscopy. Application to the Analysis of Oleoresin of <I>Pinus nigra</I>

Applied Spectroscopy, 2002

Research paper thumbnail of A first approach to chemical and mineralogical study of pigments from Lajeado Complex in Tocatins, Brazil

Summary In recent years chemical analysis has been established as a significant contributor to sc... more Summary
In recent years chemical analysis has been established as a significant contributor to science-based archaeology. The present work is a first
approach to the study of chemical and mineralogical composition of pigments used in archaeological rupestrian arts of Vão Grande site,
included in Lajeado Complex in Tocatins State, Brazil. Representative pigments micro-samples were removed from rock paintings and substrate
rock. The characterization of the pigments was carried out by micro X-ray diffraction (μ-XRD) and Fourier transform infrared microspectroscopy
(μ-FTIR).
Riassunto
Questo lavoro è un primo approccio allo studio della composizione chimica e mineralogica dei pigmenti utilizzati nel sito archeologico di arte
rupestre di Vão Grande, facente parte del complesso di Lajeado nello Stato di Tocatins, Brasile. Micro-campioni dei pigmenti sono stati rilevanti
dalle pitture rupestri e dal substrato di roccia. La caratterizzazione dei pigmenti è stata condotta con microdiffrazione dei raggi-X (μ-XRD) e
microspettroscopia a infrarossi a trasformata di Fourier (μ-FTIR).

Research paper thumbnail of Isotope geochemistry of speleothems and the Holocene climate dynamics at Natural Monument Cuevas de Fuentes de Leon region, Extremadura, Spain

A petrographic and isotopic study of a stalagmite from Los Postes cave, located at the Natural Mo... more A petrographic and isotopic study of a stalagmite from Los Postes cave, located at the Natural Monument “Cuevas de Fuentes de León”, Spain, was carried out in order to assess Holocene climate changes in the landscape of this region. The stalagmite consists of calcite, but also contains small clasts of quartz, plagioclase, zircon, "terra rossa", limestone, iron oxides and hydroxides and clay minerals. In the stalagmite, calcite columnar textures tend to yield the lowest δ18O and δ13C values, and their growth should reflect relatively slow but constant drip rates. On the other hand, layers with columnar microcrystalline and radial-acicular textures show the highest δ18O and δ13C values and are related to a decrease in the drip rate. Layers formed by aggregates of detrital materials, cemented with micrite, are associated to low drip rates or even dryness periods. However, the detrital components should have entered in the system due to torrentional transport processes. The δ18O and δ13C values co-vary, ranging from -5.17 ‰ to -2.57 ‰ and from -9.34 ‰ and -4.95 ‰, respectively. The petrographic and isotopic data point to a outset of a more dry and warm period at ca. 2.6 ka BP, with δ18O and δ13C values higher than -3.75 ‰ and -6.80 ‰, respectively, which could led to a predominance of C4 plants over C3.