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Köhler illumination is a method of specimen illumination used for transmitted and reflected light (trans- and epi-illuminated) optical microscopy.Köhler illumination acts to generate an even illumination of the sample and ensures that an image of the illumination source (for example a halogen lamp filament) is not visible in the resulting image.
Hélio Castroneves (Portuguese pronunciation: [ˈɛlju ˈkastɾu ˈnɛvis]; born Hélio Alves de Castro Neves; 10 May 1975) is a Brazilian auto racing driver. He competes part-time in the IndyCar Series, driving the No. 06 Dallara-Honda for Meyer Shank Racing.