Worm Survival Measurement
Worm Survival Measurement - Related Videos
10:44
An Introduction to Worm Lab: from Culturing Worms to Mutagenesis
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Cited by 27 •
2011
Screening for mutants with phenotypic defects is a straightforward method for identifying genes that function in a given biological process. In this article we describe how to culture free living worms (e.g., Pristionchus pacificus) in the laboratory and show two different mutagenesis methods, EMS and TMP/UV.
01:36
Worms as an Alternative Model Organism
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2026
All animal procedures described here must be conducted in accordance with institutional animal ethics guidelines and approved by IACUC. All procedures must follow the principles of the 3Rs—Replacement, Reduction, and Refinement—and must be performed by trained personnel. Introduction to C. elegans The nematode (roundworm) Caenorhabditis elegans, commonly known as C. elegans, is a widely used non-vertebrate animal model for studying fundamental biological processes. Because many cellular and...
02:19
Modeling Aeromonas Pathogenesis in C. elegans Using a Survival Assay
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2026
Source: Chen, Y., et al. Evaluating Virulence and Pathogenesis of Aeromonas Infection in a Caenorhabditis elegans Model. J. Vis. Exp. (2018)This video demonstrates a survival assay using C. elegans to model Aeromonas pathogenesis, where oral ingestion of the bacteria leads to intestinal infection and mortality, enabling quantitative assessment of bacterial virulence in a live host system.
05:18
Measurement of Survival Time in Brachionus Rotifers: Synchronization of Maternal Conditions
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Cited by 6 •
2016
Rotifers are microscopic zooplankton used as models in ecotoxicological and aging studies. Here we provide a protocol for powerful and reproducible measurement of survival time in Brachionus rotifers. Synchronization of culture conditions over several generations is of particular importance because maternal condition affects life history of offspring.
02:56
C. elegans Survival Assay: A Short-Term Toxicity Test
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2023
This video introduces a short-term survival assay that tests a treatment for acute toxicity or tests a genetic strain for resistance to a toxic condition. The example protocol shows an example survival assay in which worms are tested for their ability to resist oxidative stress induced by paraquat (PQ).
FAQs
The alive/dead rule makes scoring reproducible: a worm counts as alive when it moves spontaneously or responds to gentle stimulation. This criterion is important because an apparently motionless animal is not automatically classified as dead. Applying the same observation rule across time points and groups helps convert visual checks into comparable time-to-death records.
Time-to-death records can be summarized as survival curves, which show survival patterns across the observation period. Researchers can then compare groups using median lifespan or survival rates rather than relying on a single observation. These summaries make it easier to evaluate whether a biological condition or intervention is associated with different survival outcomes.
Controlled culture conditions and scheduled observations provide a consistent framework for comparing worms exposed to different biological or environmental conditions. Repeated checks at defined time points help distinguish genuine differences in viability, aging, or stress responses from differences caused by inconsistent handling or observation schedules. Standardization therefore supports more meaningful group comparisons.
A typical workflow maintains worms under controlled culture conditions, examines them at set time points, and scores each animal according to spontaneous movement or response to gentle stimulation. Repeated observations produce time-to-death data. Researchers can then organize those records into survival curves and calculate or compare median lifespan and survival rates between groups.
This approach is useful when researchers need to examine how genetics, toxicology, disease biology, or an intervention affects organismal health. By tracking viability over time, the assay can reveal differences associated with aging or stress responses. Its value comes from connecting defined conditions with measurable survival outcomes in individual worms or populations.
Assessing individual worms preserves time-to-death information for each animal, allowing survival patterns to be built from repeated observations. Population-focused assessment emphasizes aggregate outcomes, such as survival rates and overall survival curves. Both perspectives support biological comparisons, but they organize the evidence differently when evaluating viability, aging, stress, or treatment-related effects.