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Reproductive toxicity assessment of four portuguese plant hydrolates: Effects o...
Dias, Sandra D.F.; Andrade, L.P.; Rolo, Joana; Gaspar, Carlos; Ruivo, Patrícia Gomes; Oliveira, Ana Sofia; Ferreira, Sandra SaraivaExtracts of aromatic medicinal plants have been extensively studied regarding their numerous bioactivities. However, despite being highly used by humans, studies on the safety of these extracts for animal use are scarce. In this study, we aim to contribute to the determination of the safety profile of plant extracts by focusing on the reproductive toxicity of hydrolates (a by-product of essential oils productio...
Deep and shallow water effects on developing preschoolers’ aquatic skills
Costa, Aldo M.; Marinho, D.A.; Rocha, Helena A.; Silva, A.J.; Barbosa, Tiago M.; Ferreira, Sandra Saraiva; Martins, MartaThe aim of the study was to assess deep and shallow water teaching methods in swimming lessons for preschool children and identify variations in the basic aquatic skills acquired. The study sample included 32 swimming instructors (16 from deep water programs and 16 from shallow water programs) and 98 preschool children (50 from deep water swimming pool and 48 from shallow water swimming pool). The children were...
Discriminant analysis and decision theory
Ferreira, Sandra Saraiva; Ferreira, Dário; Nunes, Célia; Mexia, João T.A unified approach, based in Statistical Decision Theory, is presented for Discriminant Analysis. Thus optimum allocation rules minimizing the expected costs are derived for the continuous case and for the mixed case. In the first case, the observed variables are continuous, while in the mixed case, there will also be discrete as qualitative variables. The second case has many times been treated using logistic ...