[Nature and culture in the eyes of a nineteenth-century naturalist: Wallace and the Amazon].

Alfred Russel Wallace traveled through the Amazon from 1848 to 1852. His perceptions of the region were informed by his systematized knowledge but also influenced by judgments of an ethical and aesthetic nature, as was common among naturalists. He saw the region's 'natives' as peaceful and friendly but likewise susceptible to the vices of civilization.

The effect of diode laser irradiation on dentin as a preventive measure against dental erosion: an in vitro study.

Increasing rates of non-carious cervical lesions due to dental erosion, exposure of dentinal tubules, and hypersensitivity to environmental stimuli have led to the development of new prevention strategies. This study evaluated the effects of a low-intensity diode laser (λ = 808 nm) on the dentinal chemical composition and prevention of demineralization. In addition, the study monitored temperature changes during the course of irradiation.