Evidence map›Paper›PMID 34161271›Full record

ArticleProceedings of the National Academy of Sciences of the United States of America2021

An ecophysiological explanation for manganese enrichment in rock varnish.

Usha F Lingappa, Chris M Yeager, Ajay Sharma, Nina L Lanza, Demosthenes P Morales, Gary Xie, Ashley D Atencio, Grayson L Chadwick, Danielle R Monteverde, John S Magyar and 4 more

Open access · bronzeAbstract read
In one paragraph

Article in Proceedings of the National Academy of Sciences of the United States of America, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 14 papers.

0numbers the graph read from it
0cells of the map it votes in
14citing papers in PubMed
4.3field-weighted citation impact, top 6% of its field
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

14 citing papers in PubMed, 43 citations in OpenAlex.

  1. Article
  2. Article
  3. Article
  4. Article
  5. Review
  6. mBio · 2025
    Article
  7. The ternary complex of MnProceedings of the National Academy of Sciences of the United States of America · 2024
    Article
  8. Article
  9. Bridging the gap with bacterial art.FEMS microbiology letters · 2023
    Article
  10. Article
  11. Review
  12. Article
  13. Article
  14. Shining light on photosynthetic microbes and manganese-enriched rock varnish.Proceedings of the National Academy of Sciences of the United States of America · 2021
    Article
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

14 authors at 4 institutions in 1 country.

Usha F LingappaDivision of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125; usha@caltech.edu jsv@chem.ucla.edu.
Chris M YeagerLos Alamos National Laboratory, Los Alamos, NM 87545.ORCID 0000-0001-9662-5811
Ajay SharmaDepartment of Chemistry, Northwestern University, Evanston, IL 60208.ORCID 0000-0002-0829-6753
Nina L LanzaLos Alamos National Laboratory, Los Alamos, NM 87545.ORCID 0000-0003-4445-7996
Demosthenes P MoralesLos Alamos National Laboratory, Los Alamos, NM 87545.ORCID 0000-0002-4521-3478
Gary XieLos Alamos National Laboratory, Los Alamos, NM 87545.
Ashley D AtencioLos Alamos National Laboratory, Los Alamos, NM 87545.
Grayson L ChadwickDivision of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125.ORCID 0000-0003-0700-9350
Danielle R MonteverdeDivision of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125.ORCID 0000-0002-0198-8220
John S MagyarDivision of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125.ORCID 0000-0002-3586-8286
Samuel M WebbStanford Synchrotron Radiation Lightsource, Stanford University, Menlo Park, CA 94025.ORCID 0000-0003-1188-0464
Joan Selverstone ValentineDivision of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125; usha@caltech.edu jsv@chem.ucla.edu.ORCID 0000-0002-7174-925X
Brian M HoffmanDepartment of Chemistry, Northwestern University, Evanston, IL 60208.ORCID 0000-0002-3100-0746
Woodward W FischerDivision of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125.ORCID 0000-0002-8836-3054
California Institute of Technology · USLos Alamos National Laboratory · USNorthwestern University · USStanford Synchrotron Radiation Lightsource · US

Funding

X-ray Absorption Spectroscopy (XAS) pp.711-759P41GM103393 · NIGMS · STANFORD UNIVERSITY · PI HODGSON, KEITH O · 2012 to 2019
$30.6M
Coboglobins-Cobalt-Substituted Hemoglobins and MyoglobinR01GM111097 · NIGMS · NORTHWESTERN UNIVERSITY · PI HOFFMAN, BRIAN M · 2014 to 2025
$6.7M
NIGMS NIH HHS P41 GM103393NIGMS NIH HHS R01 GM111097
6 · The paper itself

Abstract

Desert varnish is a dark rock coating that forms in arid environments worldwide. It is highly and selectively enriched in manganese, the mechanism for which has been a long-standing geological mystery. We collected varnish samples from diverse sites across the western United States, examined them in petrographic thin section using microscale chemical imaging techniques, and investigated the associated microbial communities using 16S amplicon and shotgun metagenomic DNA sequencing. Our analyses described a material governed by sunlight, water, and manganese redox cycling that hosts an unusually aerobic microbial ecosystem characterized by a remarkable abundance of photosynthetic Cyanobacteria in the genus

Indexed as

Ecological and Environmental PhenomenaAntioxidantsCyanobacteriaGeologic SedimentsManganeseMicrobiotaOxidation-ReductionSunlightWaterAntioxidantsManganeseWaterCyanobacteriadesert varnishmanganeseoxidative stressrock varnish

Identifiers

PMID34161271
PMCPMC8237629
OpenAlexW3172329579

What OpenQuestion holds

Textmetadata
LicenceCC BY-NC-ND
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.