Stress Resistance Assay
Stress Resistance Assay - Related Videos
08:10
Measuring Oxidative Stress Resistance of Caenorhabditis elegans in 96-well Microtiter Plates
0 Views •
Cited by 43 •
2015
C. elegans is an attractive model organism to study signal transduction pathways involved in oxidative stress resistance. Here we provide a protocol to measure oxidative stress resistance of C. elegans animals in liquid phase, using several oxidizing agents in 96 well plates.
15:40
Forward Genetic Approach to Uncover Stress Resistance Genes in Mice — A High-throughput Screen in ES Cells
0 Views •
2015
Stress resistance is one of the hallmarks for longevity and is known to be genetically governed. Here, we developed an unbiased high-throughput method to screen for mutations that confer stress resistance in ES cells with which to develop mouse models for longevity studies.
08:46
Implementation of In Vitro Drug Resistance Assays: Maximizing the Potential for Uncovering Clinically Relevant Resistance Mechanisms
0 Views •
Cited by 2 •
2015
Drug resistance to targeted therapeutics is widespread and the need to identify mechanisms of resistance--prior to or following clinical onset--is critical for guiding alternative clinical management strategies. Here, we present a protocol to couple derivation of drug-resistant lines in vitro with sequencing to expedite discovery of these mechanisms.
03:23
Ethanol Resistance Assay to Evaluate Biofilm Matrix Integrity
0 Views •
2026
Source: Bucher, T., et al. Methodologies for Studying B. subtilis Biofilms as a Model for Characterizing Small Molecule Biofilm Inhibitors. J. Vis. Exp. (2016).This video demonstrates how biofilm matrix integrity influences bacterial resistance to ethanol by comparing colony-forming units in untreated and inhibitor-disrupted biofilms. Reduced CFUs in inhibitor-treated samples demonstrate that the extracellular matrix is essential for protecting biofilm-embedded cells from antimicrobial stress.
08:23
Comet Assay as an Indirect Measure of Systemic Oxidative Stress
0 Views •
Cited by 23 •
2015
Comet assay measures DNA breaks, induced by different factors. If all factors (except oxidative stress) causing DNA damage are kept constant, the amount of DNA damage is a good indirect parameter of oxidative stress. The goal of this protocol is to use comet assay for indirect measurement of oxidative stress.
FAQs
The biological question should determine the stressor and readout. Heat, oxidative compounds, osmotic imbalance, and nutrient limitation challenge samples in different ways, while survival, growth, metabolic activity, or recovery provide different measures of response. Including an unstressed control is essential because it supplies the baseline for judging whether a genotype, treatment, or other factor changes stress tolerance.
Results are interpreted by comparing stressed samples with the unstressed control and, when relevant, with other genotypes or treatments. Reduced survival, growth, or metabolic activity indicates poorer performance under the selected condition, whereas recovery measurements can show whether the system regains function after stress. The chosen endpoint therefore determines which aspect of resilience the assay emphasizes.
Testing heat, oxidative compounds, osmotic imbalance, and nutrient limitation can help connect an observed phenotype with protective pathways or stress-responsive genes. It can also show whether a factor influences responses across several conditions or only under the stress used. This broader comparison strengthens interpretation of biological resilience and helps distinguish general stress tolerance from a response associated with one challenge.
Researchers first define the biological samples, stress condition, comparison groups, and outcome to measure. They then expose experimental samples to the selected stressor while maintaining an unstressed control. Afterward, they quantify survival, growth, metabolic activity, or recovery and compare results among conditions, genotypes, or treatments to identify differences in tolerance.
It is useful when researchers need a standardized comparison of resilience among genotypes, treatments, cells, organisms, or tissues. The same framework can examine how a biological factor changes performance under a defined challenge, rather than relying only on observations made under unstressed conditions. Results can help identify protective pathways or stress-responsive genes for further study.
In biology, stress resistance assays provide a common experimental framework for studying adaptation, aging, disease mechanisms, toxicology, and drug response. Their value comes from linking a controlled challenge to measurable outcomes such as survival, growth, metabolic activity, or recovery. This allows investigators to examine resilience in different biological systems and compare how treatments or genotypes alter responses.