In the present paper we study Riemannian and canonical geodesics in a real flag manifold M, considered as curves in the ambient Euclidean space of the natural embedding of M.

In the present paper we present a survey of results concerning the variety <img width=46 height=19 src="/img/revistas/ruma/v47n1/1a110x.png">of planar normal sections associated to a natural embedding of a real flag manifold <img width=29 height=12 src="/img/revistas/ruma/v47n1/1a111x.png">. The results included are those that, we feel, better describe the nature of this algebraic variety of <img width=55 height=14 src="/img/revistas/ruma/v47n1/1a112x.png">. In particular we present results concerning its Euler characteristic showing that it depends only on <img width=52 height=12 src="/img/revistas/ruma/v47n1/1a113x.png">and not on the nature of <img width=18 height=12 src="/img/revistas/ruma/v47n1/1a114x.png">itself. Furthermore, when <img width=18 height=12 src="/img/revistas/ruma/v47n1/1a115x.png">is the manifold of complete flags of a compact simple Lie group, we present what is, in some sense, its dimension and a large class of submanifolds of <img width=55 height=15 src="/img/revistas/ruma/v47n1/1a116x.png">contained in <img width=46 height=19 src="/img/revistas/ruma/v47n1/1a117x.png">.

The purpose of the study was to observe eletrogenerated chemiluminescence (ECL) of luminol using different materials as electrodes such as wires, nails, coins, razor blades, etc. Based on the experimental observations and the mechanisms proposed in the literature, students should be capable of analyzing their results in order to understand the phenomena studied. Students could then elaborate a mechanism of action consistent with the experimental results which could rationalize the formation of intermediates in the reaction and the dependence of ECL on solution pH in addition to other points of interest