Supported by. Venezuelaâs economy is dominated by the oil industry, and it has the largest proven reserves of crude oil in the world. President Hugo Chavez, who was elected in 1998 on a populist platform, consolidated state control over the economy and nationalized its telephone and electricity companies.
Chromatography (/ËkroÊmÉËtÉÉ¡rÉfi/ ; from Greek ÏÏá¿¶Î¼Î± chroma which means color and Î³ÏÎ¬ÏÎµÎ¹Î½ graphein to write) is the collective term for a set of laboratory techniques for the separation of mixtures.he purpose of preparative chromatography is to separate the components of a mixture for more advanced use (and is thus a form of purification). Analytical chromatography is done normally with smaller amounts of material and is for measuring the relative proportions of analytes in a mixture.
Paper Chromatography (Papierchromatographie). A solution of the mixture to be separated is spotted, usually from a micropipet, near one edge of a piece of filter paper, and the solvent is evaporated.Usually several sample and standard spots are placed along the edge.ariant: Two-dimensional chromatography: One spot is applied near a corner of a sheet of paper, and is developed with one solvent system. Then a second solvent system is applied from another edge so that mixed spots that did not separate with the first system may separate with the second one.