PMID- 29340254
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20200930
IS  - 2167-8359 (Print)
IS  - 2167-8359 (Electronic)
IS  - 2167-8359 (Linking)
VI  - 6
DP  - 2018
TI  - Response of methane production via propionate oxidation to carboxylated 
      multiwalled carbon nanotubes in paddy soil enrichments.
PG  - e4267
LID - 10.7717/peerj.4267 [doi]
LID - e4267
AB  - Carboxylated multiwalled carbon nanotubes (MWCNTs-COOH) have become a growing 
      concern in terms of their fate and toxicity in aqueous environments. Methane 
      (CH(4)) is a major product of organic matter degradation in waterlogged 
      environments. In this study, we determined the effect of MWCNTs-COOH on the 
      production of CH(4) from propionate oxidation in paddy soil enrichments. The 
      results showed that the methanogenesis from propionate degradation was 
      accelerated in the presence of MWCNTs-COOH. In addition, the rates of CH(4) 
      production and propionate degradation increased with increasing concentrations of 
      MWCNTs-COOH. Scanning electron microscopy (SEM) observations showed that the 
      cells were intact and maintained their structure in the presence of MWCNTs-COOH. 
      In addition, SEM and fluorescence in situ hybridization (FISH) images revealed 
      that the cells were in direct contact with the MWCNTs and formed cell-MWCNTs 
      aggregates that contained both bacteria and archaea. On the other hand, nontoxic 
      magnetite nanoparticles (Fe(3)O(4)) had similar effects on the CH(4) production 
      and cell integrity as the MWCNTs-COOH. Compared with no nanomaterial addition, 
      the relative abundances of Geobacter and Methanosarcina species increased in the 
      presence of MWCNTs-COOH. This study suggests that MWCNTs-COOH exerted positive 
      rather than cytotoxic effects on the syntrophic oxidation of propionate in paddy 
      soil enrichments and affected the bacterial and archaeal community structure at 
      the test concentrations. These findings provide novel insight into the 
      consequences of nanomaterial release into anoxic natural environments.
FAU - Zhang, Jianchao
AU  - Zhang J
AD  - Institute of Surface-Earth System Science, Tianjin University, Tianjin, China.
FAU - Xia, Xingxuan
AU  - Xia X
AD  - College of Urban and Environmental Sciences, Peking University, Beijing, China.
FAU - Li, Siliang
AU  - Li S
AD  - Institute of Surface-Earth System Science, Tianjin University, Tianjin, China.
FAU - Ran, Wei
AU  - Ran W
AD  - Jiangsu Provincial Coordinated Research Center for Organic Solid Waste 
      Utilization, Nanjing Agricultural University, Nanjing, China.
LA  - eng
PT  - Journal Article
PT  - Retracted Publication
DEP - 20180112
PL  - United States
TA  - PeerJ
JT  - PeerJ
JID - 101603425
RIN - PeerJ. 2018 Jan 23;6:. PMID: 29377018
PMC - PMC5768162
OTO - NOTNLM
OT  - Anaerobic
OT  - Carboxylated
OT  - MWCNTs
OT  - Paddy soil enrichment
OT  - Propionate
OT  - Syntrophic methanogenesis
COIS- The authors declare there are no competing interests.
EDAT- 2018/01/18 06:00
MHDA- 2018/01/18 06:01
PMCR- 2018/01/12
CRDT- 2018/01/18 06:00
PHST- 2017/10/24 00:00 [received]
PHST- 2017/12/25 00:00 [accepted]
PHST- 2018/01/18 06:00 [entrez]
PHST- 2018/01/18 06:00 [pubmed]
PHST- 2018/01/18 06:01 [medline]
PHST- 2018/01/12 00:00 [pmc-release]
AID - 4267 [pii]
AID - 10.7717/peerj.4267 [doi]
PST - epublish
SO  - PeerJ. 2018 Jan 12;6:e4267. doi: 10.7717/peerj.4267. eCollection 2018.