Abstract
The carotenoids of a strain of M. phlei were studied. The markedly high total amount of caroteonoids in this organism is largely due to the presence of an oxycarotenoid, myxoxanthophyll (phlie). The qualitative characterization and quantitative determination of different carotenoids in several mutants, as well as isotope incorporation studies and experiments on the conversion of labeled hydrocarbon fractions by bacterial homogenates gave results which are in accordance with the Porter-Lincoln hypothesis of caroteno-genesis.

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