Insights Into the Mineralogy and Surface Chemistry of Extracellular Biogenic S⁰ Globules Produced by Chlorobaculum tepidum.

ABSTRACT: Elemental sulfur (S⁰) is produced and degraded by phylogenetically diverse groups of microorganisms. For Chlorobaculum tepidum, an anoxygenic phototroph, sulfide is oxidized to produce extracellular S⁰ globules, which can be further oxidized to sulfate. While some sulfur-oxidizing bacteria (e.g., Allochromatium vinosum) are also capable of growth on commercial S⁰ as an electron donor, C. tepidum is not. Even colloidal sulfur sols, which appear indistinguishable from biogenic globules, do not support the growth of C. tepidum. Here, we investigate the properties that make biogenic S⁰ globules distinct from abiotic forms of S⁰. We found that S⁰ globules produced by C. tepidum and abiotic S

SUBMITTER: Marnocha CL 

PROVIDER: S-EPMC6398422 | biostudies-literature | 2019

REPOSITORIES: biostudies-literature