Bose-Einstein condensation of exciton polaritons.

Phase transitions to quantum condensed phases--such as Bose-Einstein condensation (BEC), superfluidity, and superconductivity--have long fascinated scientists, as they bring pure quantum effects to a macroscopic scale. BEC has, for example, famously been demonstrated in dilute atom gas of rubidium atoms at temperatures below 200 nanokelvin. Much effort has been devoted to finding a solid-state system in which BEC can take place.

[Oculocutaneous albinism: clinical, historical and anthropological aspects].

Albinism represents a group of inherited abnormalities of the melanin pigment system in which the synthesis of melanin is absent or reduced, generalized (oculocutaneous albinism) or localised (ocular albinism). Recent molecular studies provide insight into the pathophysiological processes of pigmentation regulation and help our understanding of the genetic heterogeneity of human albinism. It rarely affects Europeans, frequently Africans, only a minority of Amerindians, who nevertheless, when an ethnic group is concerned, presents one of the highest incidence in the world.