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Natural products and related compounds formally derived from isoprene units (see isoprenoids). They contain oxygen in various functional groups. This class is subdivided according to the number of carbon atoms in the same manner as are terpenes. The skeleton of terpenoids may differ from strict additivity of isoprene units by the loss or shift of a fragment, generally a methyl group. BNRD, Prenol Nomenclature, Rule Pr-10 (p. 255)
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TCA definition
see 1,1,1-trichloroethane.
tangential lines definition
in the measurement of photolithographic instruments, an evaluative line pattern in which the lines lie perpendicular to a radius to the optical axis. [SEMI P25-94]
technology driver definition
leading-edge process/product technology that drives development of next-generation equipment, unit processes, and manufacturing techniques. Essential elements include high-volume diagnostic techniques for accelerated learning and a large revenue...
Swain-Lupton equation definition
A dual parameter approach to the correlation analysis of substituent effects, which involves a field constant (F) and a resonance constant (R). The original treatment was modified later. SWAIN and LUPTON (1968); SWAIN, UNGER, ROSENQUIST and SWAIN...
test wafer definition
see wafer, test.
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