Preferential Root Tropism Induced by Structural Inhomogeneities in 2D Wet Granular Media

11 pages, 6 FiguresWe investigate certain aspects of the physical mechanisms of root growth in a granular medium and how these roots adapt to changes in water distribution induced by the presence of structural inhomogeneities in the form of solid intrusions. Physical intrusions such as a square rod added into the 2D granular medium modify water distribution by maintaining robust capillary action, pumping water from the more saturated areas at the bottom of the cell towards the less saturated areas near the top of the cell while the rest of the medium is slowly devoid of water via evaporation. This water redistribution induces `preferential tropism' of roots, guiding the roots and permitting them to grow deeper into more saturated regions in the soil. This further allows more efficient access to available water in the deeper sections of the medium thereby resulting to increased plant lifetim

A angústia, o nada e a morte em Heidegger Anguish, nothingness and death in Heidegger

O artigo investiga a relação entre os conceitos de medo, angústia, nada e morte na filosofia da existência de Heidegger. Pretende-se apontar para o papel destes fenômenos existenciais na passagem do ser-aí desde a inautenticidade para a autenticidade de seu ser.<br>This paper investigates the relationship between the concepts of fear, anguish, nothingness and death in Heidegger's philosophy of existence. It points to the role of these existential phenomena in the transformation of "Dasein", from the inauthenticity to the authenticity of its Being