A method for the in vivo bioconversion of cyclic carotenes having a .beta.-ionone ring to the corresponding aryl carotene is provided. Gram negative host cells expressing a heterologous, codon-optimized gene encoding a carotene desaturase are grown in the presence of a suitable cyclic carotene substrate to effect the production of aromatic carotenoids.

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> Continuous process for producing poly (trimethylene terephthalate)

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