Evidence map›Paper›PMID 29343752›Full record

ArticleScientific reports2018

Counting Caenorhabditis elegans: Protocol Optimization and Applications for Population Growth and Toxicity Studies in Liquid Medium.

Leona D Scanlan, Steven P Lund, Sanem Hosbas Coskun, Shannon K Hanna, Monique E Johnson, Christopher M Sims, Karina Brignoni, Patricia Lapasset, Elijah J Petersen, John T Elliott and 1 more

Abstract read
In one paragraph

Article in Scientific reports, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 26 papers.

0numbers the graph read from it
0cells of the map it votes in
26citing 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

26 citing papers in PubMed.

  1. Nanoscale advances · 2026
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  17. Emerging Standards and Analytical Science for Nanoenabled Medical Products.Annual review of analytical chemistry (Palo Alto, Calif.) · 2020
    Review
  18. Article
  19. Frontiers in nutrition · 2020
    Review
  20. 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

11 authors.

Leona D ScanlanNational Institute of Standards and Technology, Material Measurement Laboratory - Biomolecular Measurements Division, 100 Bureau Drive, Gaithersburg, MD, 20899, United States. scanlan.leona@gmail.com.
Steven P LundNational Institute of Standards and Technology, Information Technology Laboratory - Statistical Engineering Division, 100 Bureau Drive, Gaithersburg, MD, 20899, United States.
Sanem Hosbas CoskunNational Institute of Standards and Technology, Material Measurement Laboratory - Biosystems and Biomaterials Division, 100 Bureau Drive, Gaithersburg, MD, 20899, United States.
Shannon K HannaNational Institute of Standards and Technology, Material Measurement Laboratory - Biosystems and Biomaterials Division, 100 Bureau Drive, Gaithersburg, MD, 20899, United States.
Monique E JohnsonNational Institute of Standards and Technology, Material Measurement Laboratory - Chemical Sciences Division, 100 Bureau Drive, Gaithersburg, MD, 20899, United States.
Christopher M SimsNational Institute of Standards and Technology, Material Measurement Laboratory - Biosystems and Biomaterials Division, 100 Bureau Drive, Gaithersburg, MD, 20899, United States.
Karina BrignoniNational Institute of Standards and Technology, Material Measurement Laboratory - Biomolecular Measurements Division, 100 Bureau Drive, Gaithersburg, MD, 20899, United States.
Patricia LapassetNational Institute of Standards and Technology, Material Measurement Laboratory - Chemical Sciences Division, 100 Bureau Drive, Gaithersburg, MD, 20899, United States.
Elijah J PetersenNational Institute of Standards and Technology, Material Measurement Laboratory - Biosystems and Biomaterials Division, 100 Bureau Drive, Gaithersburg, MD, 20899, United States.
John T ElliottNational Institute of Standards and Technology, Material Measurement Laboratory - Biosystems and Biomaterials Division, 100 Bureau Drive, Gaithersburg, MD, 20899, United States.
Bryant C NelsonNational Institute of Standards and Technology, Material Measurement Laboratory - Biosystems and Biomaterials Division, 100 Bureau Drive, Gaithersburg, MD, 20899, United States. bryant.nelson@nist.gov.ORCID http://orcid.org/0000-0001-8166-4121

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

The nematode Caenorhabditis elegans is used extensively in molecular, toxicological and genetics research. However, standardized methods for counting nematodes in liquid culture do not exist despite the wide use of nematodes and need for accurate measurements. Herein, we provide a simple and affordable counting protocol developed to maximize count accuracy and minimize variability in liquid nematode culture. Sources of variability in the counting process were identified and tested in 14 separate experiments. Three variables resulted in significant effects on nematode count: shaking of the culture, priming of pipette tips, and sampling location within a microcentrifuge tube. Between-operator variability did not have a statistically significant effect on counts, even among differently-skilled operators. The protocol was used to assess population growth rates of nematodes in two different but common liquid growth media: axenic modified Caenorhabditis elegans Habitation and Reproduction medium (mCeHR) and S-basal complete. In mCeHR, nematode populations doubled daily for 10 d. S-basal complete populations initially doubled every 12 h, but slowed within 7 d. We also detected a statistically significant difference between embryo-to-hatchling incubation period of 5 d in mCeHR compared to 4 d in S-basal complete. The developed counting method for Caenorhabditis elegans reduces variability and allows for rigorous and reliable experimentation.

Indexed as

AnimalsCaenorhabditis elegansCulture MediaNematodaPopulation GrowthReproductionCulture Media

Identifiers

PMID29343752
PMCPMC5772475

What OpenQuestion holds

Textmetadata
LicenceCC BY
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Registered trials

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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.