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Relating air Pollution and Respiratory Diseases Occurrences

Com o apoio RAADRI. ; In this article we study the impact of air pollution on children's health in Portugal. In particular, we focus our attention on the city of Barreiro. We use the general linear methods (GLM), taking advantage of all the ease of handling and analyzing data in order to relate air quality and health. We relate levels of air pollution and incidence of entries from children with symptoms of res...

Effect of extended cooking and oxigen prebleaching on the surface energy of Euc...

DNA topoisomerase inhibitors: biflavonoids from Ouratea species

Topoisomerase inhibitors are agents with anticancer activity. 7"-O-Methyl-agathisflavone (I) and amentoflavone (II) are biflavonoids and were isolated from the Brazilian plants Ouratea hexasperma and O. semiserrata, respectively. These biflavonoids and the acetyl derivative of II (IIa) are inhibitors of human DNA topoisomerases I at 200 µM, as demonstrated by the relaxation assay of supercoiled DNA, and only ag...

Cellulose Depolymerisation and Paper Properties in E. Globulus Kraft Pulps

The aim of this work was to study the impact of cellulose depolymerisation on the beating potential and handsheet properties of the portuguese E. globulus kraft pulp. A homogeneous sample of eucalypt wood chips was cooked using different kraft pulping conditions (cooking temperatures and times, and sodium hydroxide and sodium sulphide concentrations) in order to obtain a wide variation for intrinsic viscosity o...

Comparative study of cellulose fragmentation by enzymes and ultrasound

The stability in aqueous suspensions of two particulate celluloses, Sigmacell type 100 and Avicel PH101, was analyzed. The effect of the presence of a cellulase from Trichodenna reesei, ionic strength, and ultrasonic agitation on the fragmentation/aggregation phenomena was studied. Particle size distributions of the powders were obtained with three different particle sizers: the Galai CIS 100, the Coulter Mult...

Specificity of creatine kinase isoenzyme MB in cardiac surgery with extracorpor...

Estudaram-se em 6 doentes com valvulopatias reumatismais, as variações da actividade enzimática no plasma, durante e apos a cirurgia cardíaca com circulação extra-corporal, para verificar a especificidade da isoenzima MB da creatinaquinase, comparando-a com a da CK. Estudaram-se também as variações da desidrogenase láctica no mesmo período. O protocolo de colheitas escolhido, procurava dissociar as variações en...