USP sediará palestras com pesquisadores da University of Aberdeen
No dia 19 de outubro de 2015, a Universidade de São Paulo sediará palestras de dois pesquisadores da University of Aberdeen (Escócia) – Prof. Peter McCaffery (Institute of Medical Sciences) e Prof. Benjamin Kneller (School of Geosciences) – com o objetivo de identificar oportunidades de colaboração entre pesquisadores de ambas as instituições.
As apresentações serão proferidas em inglês, sem tradução simultânea. Não há necessidade de inscrição prévia.
Os locais, horários e conteúdos das palestras podem ser consultados a seguir:
Palestra do Prof. Peter McCaffery, Institute of Medical Sciences, University of Aberdeen
Vitamin A; an essential nutrient for the brain
In the central nervous system the function of retinoic acid, the active metabolite of vitamin A, is best understood from its action in guiding embryonic development; as development comes to completion, retinoic acid signalling declines. However, it is increasingly recognized that this signalling mechanism does not disappear in the adult brain but becomes more regionally focused and takes on new roles. These functions are often tied to processes of neural plasticity whether in the hippocampus, through control of neurogenesis, or the hypothalamus. The role of retinoic acid in the control of plastic processes has led to suggestions of its involvement in neural disorders, both degenerative and psychiatric. This presentation describes some of our recent research on this topic.
Data e horário: 19 de outubro de 2015, das 13h30 às 14h30
Local: Instituto de Química (IQ) – Anfiteatro Vermelho – Bloco 6, piso superior
Av. Prof. Lineu Prestes, 748 – Cidade Universitária, São Paulo
Palestra do Prof. Benjamin Kneller, School of Geosciences, University of Aberdeen
Sediment transport by buoyancy-driven flows in the ocean
Two principal types of buoyancy-driven flows exist in the ocean; river plumes and turbidity currents. In (positively buoyant) river plumes, the shear layer at the boundary with ambient sea-water (the lower boundary) is typically stable, indicating that the effect of the density gradient dominates over the effect of the fluid shear (gradient Richardson numbers of >0.25). This means that the turbulence that is responsible for sediment suspension is generated by other means. By contrast, the classic view of (negatively buoyant) turbidity currents is that the shear layer at the boundary with ambient sea-water (the upper boundary) is unstable, with gradient Richardson numbers of <0.25. This leads to the formation of Kelvin-Helmholtz instabilities and the generation of much of the turbulence that is responsible for the suspension of sediment, but also for the entrainment of ambient fluid. Additionally, the viscous dissipation of this turbulence is responsible for much of the drag experienced by the current. This view is inconsistent with the persistence of such currents over hundreds to thousands of kilometers over the low gradients of the ocean floor. An alternate view is presented for turbidity currents on low gradients.
Data e horário: 19 de outubro de 2015, das 14h30 às 15h30
Local: Instituto de Geociências (IGc) – Auditório 5 – 1º andar
Rua do Lago, 562 – Cidade Universitária, São Paulo