x 10-, (2.8 + 1.0) x 10-, and (3.0 + 1.8) x 10-cm molecules-cm-for H202, HNO3, and HO2NO2, respectively. The uncertainty is for one standard deviation. Assuming excitation of these modes by solar absorption is dissociative for HO2NO2, these measurements confirm that this process will play a small role in the atmospheric photochemistry of the lower stratosphere.
Methanogenic communities that degrade alkanes have been reported. However, little is known about the key players involved in the process. Methanogenic hexadecane-degrading consortia were enriched from an oilfield (Shengli, China). The microbial dynamics during the transfer incubations were monitored using terminal restriction fragment length polymorphism (T-RFLP) fingerprinting of 16S rRNA genes in combination with cloning and sequencing. The archaeal community shifted from a predominance of aceticlastic Methanosaeta during early cultivation to a substantial increase in hydrogenotrophic Methanoculleus in the highly enriched culture. Bacterial T-RFs 161 and 164 bp were consistently detected during the incubation and became dominant in the highly enriched culture. T-RF 161 bp primarily represented uncultured Waste Water of Evry 1 bacterium, which was possibly associated with Candidatus Cloacamonas acidaminovorans (99.7% sequence similarity). T-RF 164 bp could be assigned to both Thermotogaceae, with the closest relative being Candidatus Mesotoga sulfurreducens (similarity of 97%) and Syntrophaceae, with Smithella propionica as the closest relative (similarity of 96-97%). These bacterial lineages were potentially capable of syntrophic interactions with methanogen partners during hexadecane degradation. Partial assA genes (encoding the α-subunit of alkylsuccinate synthase) were also detected, implying that the mechanism of fumarate addition may function in the hexadecane activation.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.