No abstract

Aqueous binary solutions of hexadecyltrimethylammonium bromide (HTAB) and o-iodophenol (OIPh) exhibit remarkable viscoelasticity. From the centrifuged sediment of such a solution a crystalline product was isolated on long standing. Elementary analysis of the crystals for C, H, and N gave an estimated composition consistent with a one-to-one molar ratio of the two substances. Comparisons with DSC and IR measurements on the crystal and equimolar mechanical mixtures suggested that a crystalline complex was formed characterized by low thermal stability.

We obtained 19 individual DNA fragments encoding 2-deoxy-scyllo-inosose synthase involved in the biosynthesis of aminoglycoside antibiotics from deep-sea sediments of the Pacific Ocean. Compared with genes from land-based environmental DNA, they showed low diversity. Combined with our previous study concerning the discovery of other aminoglycoside-biosynthetic genes from the same deep-sea samples, we suggest the importance of exploration of multiple biosynthetic genes to determine the diversity of aminoglycoside producers. We found that the deep sea is a useful source for screening of these genes.