Center for Geomicrobiology, Department of Bioscience, Aarhus University, Aarhus, Denmark.
Department of Geological and Environmental Sciences, Ben-Gurion University of the Negev, P.O. Box 653, Beer-Sheva 84105, Israel.
Sci Adv. 2019 Jul 24;5(7):eaaw1480. doi: 10.1126/sciadv.aaw1480. eCollection 2019 Jul.
A sulfide-oxidizing microorganism, (DA), generates a consistent enrichment of sulfur-34 ( ) in the produced sulfate of +12.5 per mil or greater. This observation challenges the general consensus that the microbial oxidation of sulfide does not result in large enrichments and suggests that sedimentary sulfides and sulfates may be influenced by metabolic activity associated with sulfide oxidation. Since the DA-type sulfide oxidation pathway is ubiquitous in sediments, in the modern environment, and throughout Earth history, the enrichments and depletions in in sediments may be the combined result of three microbial metabolisms: microbial sulfate reduction, the disproportionation of external sulfur intermediates, and microbial sulfide oxidation.
一种硫化物氧化微生物（DA）可使生成的硫酸盐中的硫-34（ ）富集度达到+12.5‰或更高，这一观察结果挑战了硫化物微生物氧化不会导致大量 富集的普遍共识，并表明沉积态的硫化物和硫酸盐可能受到与硫化物氧化相关的代谢活动的影响。由于 DA 型硫化物氧化途径在沉积物中普遍存在，在现代环境中和地球历史的各个时期，沉积物中 的富集和亏损可能是三种微生物代谢作用的综合结果：微生物硫酸盐还原作用、外部硫中间产物的歧化作用和微生物硫化物氧化作用。
