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Proceedings of the National Academy of Sciences Phosphate availability affects the thylakoid lipid composition and the expression of SQD1 , a gene required for sulfolipid biosynthesis in Arabidopsis thaliana. Slopes and their gradients represented for the colonizers a huge obstacle, not only to occupy them but also to escalate them. Humboldt, the romantic scientist, did not find any tension between purely quantitative approaches to natures and qualitative aesthetic-historical ones. This fact was particularly important in the area of what constitutes today Colombia, since the cordillera divides into three ranges where only a few temperate climate—a plateau areas can be found. In the case of the Uwa, for instance, every clan or social group is named and identified with the basin of one of the main rivers of the cordil- lera, and it constitutes the territory granted to this group for the use of certain forest products see figure 4.

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