FCT: DQ - Documentos de conferências nacionais
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- Low-temperature Thermodynamic Study of the Empty Clathrate HydratesPublication . Cruz, Fernando J. A. L.; Alavi, Saman; Mota, José Paulo Barbosa; LAQV@REQUIMTE; DQ - Departamento de Química
- Hopanoides no Miocénico da sondagem de Belverde (Península de Setúbal)Publication . Pais, João José Cardoso; Legoinha, Paulo Alexandre Rodrigues Roque; Abreu, Pedro Jorge Macedo de; Noronha, João Paulo da Costa de; Relva, Angela M.; DQ - Departamento de Química; CQFB-REQUIMTE - Centro de Química Fina e Biotecnologia (Lab. Associado REQUIMTE); CICEGE - Centro de Investigação em Ciência e Engenharia Geológica; DCT - Departamento de Ciências da Terra[RESUMO] Neste estudo foram identificados por GC-MS seis hopanoides em amostras de sedimentos recolhidos na sondagem de Belverde, em ambientes marinhos de diferentes andares do Miocénico. A análise quantitativa preliminar, sugere uma diminuição da abundância dos bio-hopanoides com a profundidade de colheita dos sedimentos, o que pode ser interpretado em termos de decaimento diagenético relacionado com o input bacteriano. [ABSTRACT] In the present research, six hopanoids were identified by GC-MS from samples of sediments collected in the Miocene of the Belverde borehole. Preliminary quantitative analysis suggests a downcore concentration of biohopanoids, as a result of a diagenetic decline related to the bacterial input. (24) (PDF) Hopanoides no Miocénico da sondagem de Belverde (Península de Setúbal). Available from: https://www.researchgate.net/publication/249656092_Hopanoides_no_Miocenico_da_sondagem_de_Belverde_Peninsula_de_Setubal [accessed Dec 03 2019].
- Biotreated conventional concrete and CDW-concrete by use of microbial mixed cultures bioproductsPublication . Garcia-Gonzalez, Julia; Freches, André; Lemos, P. C.; Vaz, Pedro; Pereira, Alice S.; Juan-Valdes, Andres; Faria, Paulina; DEC - Departamento de Engenharia Civil; UCIBIO - Applied Molecular Biosciences Unit; DQ - Departamento de Química; LAQV@REQUIMTECracks form in all concrete constructions shortening the life of concrete elements, particularly in exposed concrete. They provide a path for transport of moisture, chlorides, and various other deleterious substances. The aim of this study was to assess the protection and consolidation effect of eco-friendly healing biotreatments on water absorption of conventional and recycled concrete, with 50% substitution of natural coarse aggregate by CDW aggregate. Concrete were treated with bioproducts obtained using waste biomass from a microbial mixed culture process for polyhydroxyalkanoates production. Results showed that the reference samples, with application of tap water, presented an increase in water drop permeability, being the absorption time shorter than in the control (untreated) samples. The biotreatment with the non-sonicated bioproduct increased significantly the water absorption time, more evident in conventional concrete samples than in recycled ones. In the case of the sonicated bioproducts, the behaviour was similar for both types of concrete specimens, but the healing effect was higher. When the biotreatment was performed with three applications, the healing effect was not so effective. This observation may be associated with the formation of a hydrophobic film of organic material from the bioproduct, which detached from the concrete surface after outdoors exposure.