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gas chromatography

a method of chemical analysis used to separate and identify the components of a mixture. The substance being tested is placed at one end of a long tube, and its components are volatilized by an inert gas injected into the tube. Components can be identified by the time they take to pass through the tube. The technique is used to separate and quantify barbiturates, steroids, and fatty acids.

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Psychology term of the day

May 26th 2024

metachromatic leukodystrophy

metachromatic leukodystrophy

an autosomal recessive disorder (see recessive allele) characterized by deficiency or absence of the enzyme arylsulfatase A, which results in loss of myelin in the nervous system and accumulation of cerebroside sulfate (a type of myelin lipid) within the white matter of the central nervous system. Loss of motor function and deterioration in mental ability most commonly develop after the 1st year of life (late infantile form), but symptoms may also appear between 3 and 10 years of age (juvenile form) or around age 30 (adult form).