Evidence map›Paper›PMID 26282698›Full record

ArticleMicrobial ecology in health and disease2015

Indole - the scent of a healthy 'inner soil'.

Arnold Berstad, Jan Raa, Jørgen Valeur

Abstract read
In one paragraph

Article in Microbial ecology in health and disease, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 20 papers.

0numbers the graph read from it
0cells of the map it votes in
20citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

20 citing papers in PubMed.

  1. Article
  2. Article
  3. Article
  4. Review
  5. Review
  6. Article
  7. Review
  8. Review
  9. Article
  10. Article
  11. Identification of Genetic VariantsFrontiers in microbiology · 2020
    Article
  12. Article
  13. Article
  14. Review
  15. Review
  16. Article
  17. Article
  18. Coprophagy in nineteenth-century psychiatry.Microbial ecology in health and disease · 2018
    Article
  19. Probiotic lactic acid bacteria - the fledgling cuckoos of the gut?Microbial ecology in health and disease · 2016
    Article
  20. Biodiversity of Intestinal Lactic Acid Bacteria in the Healthy Population.Advances in experimental medicine and biology · 2016
    Review
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

3 authors.

Arnold BerstadUnger-Vetlesen Institute, Lovisenberg Diakonale Hospital, Oslo, Norway; arnold.berstad@k2.uib.no.
Jan RaaUnger-Vetlesen Institute, Lovisenberg Diakonale Hospital, Oslo, Norway.
Jørgen ValeurUnger-Vetlesen Institute, Lovisenberg Diakonale Hospital, Oslo, Norway.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Tryptophan is an essential amino acid with an indole nucleus. Humans cannot produce this amino acid themselves, but must obtain it through their diet. Much attention is currently paid to the wide physiological and clinical implications of the tryptophan-derived substances, serotonin and kynurenines, generated by human enzymes following the intestinal absorption of tryptophan. However, even before being absorbed, several microbial metabolites of tryptophan are formed, mainly from 'malabsorbed' (incompletely digested) proteins within the colon. The normal smell of human faeces is largely due to indole, one of the major metabolites. Recent studies indicate that this foul-smelling substance is also of utmost importance for our health.

Indexed as

hydrogen peroxideindoleindoleamine dioxygenaseirritable bowel syndromemelatonintryptophan

Identifiers

PMID26282698
PMCPMC4539392

What OpenQuestion holds

Textmetadata
LicenceCC BY-NC
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.