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isoalkane

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isoalkane

[¦ī·sō′al‚kān]
(organic chemistry)
An alkane with a branched chain whose next-to-last carbon atom is bonded to a single methyl group.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Aromatic hydrocarbons are considered to be relatively more toxic and more resistant to microbial degradation than the corresponding normal alkanes, isoalkanes, cycloalkanes, and the unsaturated aliphatic hydrocarbons [5, 31].
CHANGES IN MOLECULAR COMPOSITION AND LEVELS OF AEROBIC BIODEGRADATION LEVEL DESCRIPTION 0 paraffinic crude oil not biodegraded 1 [C.sub.1] to [C.sub.15] n-alkanes depleted minor 2 90% of [C.sub.1] to [C.sub.35] n-alkanes light removed 3 alkylcyclohexanes and alkylbenzenes removed, moderate isoalkanes (including isoprenoids) reduced 4 isoprenoids and methylnaphthalenes removed, moderate aromatics depleted in order of increasing molecular weight and alkyl substitution 5 [C.sub.14]-[C.sub.16] bicyclic alkanes extensive removed 6 smaller steranes removed, larger steranes heavy altered, 25-norhopanes formed 7 all steranes removed, 25-norhopanes more heavy abundant 8 hopanes altered very heavy 9 hopanes removed, disteranes altered, severe
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