Reference health
RETRACTED ARTICLE: Tobacco-smoking-related prevalence of methanogens in the oral fluid microbiota
1 of 23 checkable references need attention · checked 2026-07-22
At the dated check, the references listed below either did not resolve in Crossref or DataCite, or carried a retraction notice. Each one is shown with the registry record that put it there.
2 without a DOI — not checked. A reference deposited without a DOI is never matched by title or guessed at; it stays outside the checked set, and this line discloses that.
References needing attention
marked retracted — notice via Crossref, record curated by Retraction Watch10.1038/ijo.2011.153
RETRACTED ARTICLE: Obesity-associated gut microbiota is enriched in Lactobacillus reuteri and depleted in Bifidobacterium animalis and Methanobrevibacter smithii
The 22 checked references that resolve
resolves10.1016/j.archoralbio.2014.05.011
Prevalence and quantification of the uncommon Archaea phylotype Thermoplasmata in chronic periodontitis
resolves10.1111/j.1600-0765.2011.01347.x
Prevalence and microbiological diversity of Archaea in peri-implantitis subjects by 16S ribosomal RNA clonal analysis
resolves10.1007/s00421-009-1178-3
Effects of saliva collection using cotton swab on cortisol enzyme immunoassay
resolves10.1128/JCM.02863-12
Real-Time PCR Quantification of Methanobrevibacter oralis in Periodontitis
resolves10.1111/j.1600-051X.2004.00597.x
Subgingival microbiota of chronic periodontitis subjects from different geographic locations
resolves10.1111/j.1600-051X.1998.tb02481.x
Psychosocial factors, dental plaque levels and smoking in periodontitis patients
resolves10.1111/j.1365-2982.2008.01142.x
Small intestinal bacterial overgrowth in irritable bowel syndrome: association with colon motility, bowel symptoms, and psychological distress
resolves10.1007/s10096-016-2627-7
Aerobic culture of methanogenic archaea without an external source of hydrogen
resolves10.1007/s10096-014-2137-4
Aerobic culture of anaerobic bacteria using antioxidants: a preliminary report
resolves10.1128/aem.60.4.1232-1240.1994
Group-specific 16S rRNA hybridization probes to describe natural communities of methanogens
resolves10.1099/00221287-148-11-3521
The mcrA gene as an alternative to 16S rRNA in the phylogenetic analysis of methanogen populations in landfill
b
bThe GenBank accession numbers for the mcrA sequences reported in this paper are AF414034–AF414051 (see Fig. 2) and AF414007–AF414033 (environmental isolates in Fig. 3).
The 2 references without a DOI — listed, not checked
no DOI — not checkedNkamga, V. D. et al. Diversity of Human-Associated Methanobrevibacter Smithii Isolates Revealed by Multispacer Sequence Typing. CurrMicrobiol 70, 810–815 (2015).
no DOI — not checkedR. Development Core Team. R: A language and environment for statistical computing. R Foundation for Statistical Computing, Vienna, Austria. ISBN 3-900051-07-0, http://www.R-project.org (2008).
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