Browsing by Issue Date, starting with "2012-08"
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- Entropy Analysis of the Genetic Sequence of Six SpeciesPublication . Tenreiro Machado, J. A.This paper studies the genetic sequence of six species and describes a formulation of quantifying scheme inspired in the state space representation. The information of each chromosome is translated into a two dimensional plot and converted into an histogram. The information is then analysed by two methods, namely with Shannon entropy and mutual information, or the Jensen-Shannon divergence and map visualization using multidimensional scaling. Some similarity of the information content shows that scale is relevant. Therefore, the consideration of each chromosome length helps in getting a more clear picture of the species characteristics.
- Cytotoxic activity of marine cyanobacteria against cancer cell linesPublication . Ribeiro, Maria João; Costa, Margarida; Leão, Pedro; Barros, Piedade; Vasconcelos, Vítor; Martins, RosárioMarine cyanobacteria possess an extensive capacity to produce compounds that were found to induce biological activities against cell lines and organisms. Many of the marine cyanobacteria compounds already described were found to induce toxicity against cancer cells.
- Embryotoxicity assessment of a Microcystis extract with Daphnia in vitro egg testPublication . Barros, Piedade; Martins, RosárioMicrocystis aeruginosa is a colonial unicellular cyanobacteria, usually found in eutrophic and hipereutrophic waters. Microcystins are the main toxins produced. As chronic toxicity test for daphnid is time consuming, the developmental stages of Daphnia eggs in vitro has been used in several works as an alternative to the 21 days reproduction test.
- Isolation of Hierridin B from a culturable Cyanobium sp. strain isolated from the Portuguese coastPublication . Leão, Pedro N.; Pereira, Alban R.; Costa, Margarida; Ramos, Vítor; Martins, Rosário; Gerwick, William H.; Vasconcelos, VitorCyanobacteria are a genetically diverse group of phototrophic prokaryotes. On a secondary metabolite perspective, however, filamentous and benthic forms have been the major sources of compounds isolated from these organisms. Nevertheless, unicellular free-living, planktonic cyanobacteria also contain enzymatic machinery for secondary metabolite biosynthesis.
- Evidência psicométrica da estrutura fatorial do inventário do sexismo ambivalente em brasileiros e portuguesesPublication . Formiga, Nilton; Serrão, CarlaO presente estudo tem como objetivo comparar a estrutura bidimensional do Sexismo Ambivalente em amostras do Brasil e de Portugal. 802 sujeitos (408 portugueses e 394 brasileiros) de 16 a 66 anos participaram do estudo e responderam o inventário de sexismo ambivalente e questões sóciodemográficas. Nas duas amostras, a maioria eram mulheres (64%) e 84% solteiros. Realizada uma análise de modelagem estrutural, confirmou-se, nas duas amostras, a bidimensional do sexismo, observando uma associação positiva entre sexismo hostil e benevolente. O resultado, além de corroborar os demais estudos em outros países, oferece suporte à teoria do sexismo ambivalente, a qual poderá ser observar na dinâmica social, independente, da cultura e contexto amostral.
- Citotoxicity of marine cyanobacteria from the portuguese coast agains breast cancer cellsPublication . Costa, Margarida; Leão, Pedro; Ribeiro, Maria João; Costa-Rodrigues, João; Garcia, Mónica; Barros, Piedade; Fernandes, Helena; Vasconcelos, Vítor; Martins, RosárioThe marine environment possesses an unmeasured chemical and biological diversity, being considered an extraordinary resource for the discovery of new therapeutic drugs. Between others, marine cyanobacteria have emerged as a prominent source of bioactive secondary metabolites with a promising anticancer potential, as the described and intensively studied dolastatins.
- Association between milk intake, leisure-time physical activity and abdominal obesity in girls 2012Publication . Abreu, Sandra; Santos, Rute; Moreira, Carla; Santos, Paula Clara; Vale, Susana; Soares-Miranda, Luísa; Mota, Jorge; Moreira, PedroDiet and physical activity are recognized as important factors to prevent abdominal obesity (AO), which is strongly associated with chronic disease (type 2 diabetes, cardiovascular diseases, etc.).
- Insulin resistance and its relation to adiposity, cardiorespiratory fitness and dietary intake among Azorean adolescentsPublication . Moreira, C.; Rute, Santos; Vale, S.; Santos, P. C.; Marques, A. I.; Soares-Miranda, L.; Abreu, S.; Mota, J.Insulin resistance is an important compo nent in the development of metabolic syndrome and lifestyle-related diseases. The aim of the present study is to investigate the relationship between insulin resistance (IR), adiposity, cardiorespiratory fitness (CRF) and dietary intake among Azorean adolescents.