No abstract

Two strains of iodine-producing bacteria were isolated from marine samples. 16S rRNA gene sequences indicated the strains were most closely related to Roseovarius tolerans, and phylogenetic analysis indicated both belong to the same genus. 5 mM iodide inhibited the growth of strain 2S5-2 almost completely, and of strain S6V slightly. Both strains produced free iodine and organic iodine from iodide. CH 2 I 2 , CHI 3 and CH 2 ClI were the main organic iodines produced by strain 2S5-2, and CHI 3 and CH 2 I 2 by strain S6V. Experiments using cells and spent media suggested that the organic iodines were produced from the compounds released or contained in the media and cells were necessary for the considerable production of CH 2 I 2 and CH 2 ClI, though CHI 3 was produced by spent media with H 2 O 2 or free iodine. ß

The orange-pigmented Thraustochytrium, CHN-1 strain was found to contain astaxanthin as the main carotenoid pigment. Echinenone, canthaxanthin, phoenicoxanthin and beta-carotene were also identified by high-performance liquid chromatography (HPLC) and HPLC-mass spectrometry. The total extractable carotenoid level was found to increase with culture age.