Mortality Recording
Mortality Recording - Related Videos
03:57
Assessing Pathogenic Bacteria–Induced Mortality in C. elegans Larvae
0 Views •
2025
Source: Anderson, Q. L., et al. A High-throughput, High-content, Liquid-based C. elegans Pathosystem. J. Vis. Exp. (2018)The video demonstrates a liquid-based assay where genetically modified C. elegans larvae are exposed to pathogenic bacteria in a microplate. Bacterial toxins secreted into the medium induce host stress and death. A fluorescent dye stains dead worms, allowing imaging-based quantification of mortality to assess genetic susceptibility or resistance.
07:03
Reliable Method for Assessing Seed Germination, Dormancy, and Mortality under Field Conditions
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Cited by 5 •
2016
Here we present a protocol for assessing seed survivorship, germination and dormancy under field conditions using buried, labeled seed strips and tetrazolium chloride (TZ) viability testing.
03:56
Mosquito Feeding Assay: A Method to Evaluate Test Compound Effects on Mortality and Fecundity of Adult Female Mosquitoes
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2025
This video demonstrates a blood-feeding assay to evaluate the mortality and fecundity of test compounds with novel modes of action on female mosquitoes. This technique helps in screening new classes of insecticides to kill the resistant population of mosquitoes and control disease spread.
03:55
Larval Contact Assay: A Procedure to Evaluate Mosquito Larval Mortality following Direct Contact with Test Larvicidal Compound
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2025
In this video, we describe the larval contact assay to evaluate the toxicity of the dopamine receptor antagonist amitriptyline on the third instar stage larvae of mosquitoes, known vectors of several human infectious diseases. Assessing the larval mortality upon incubation with different amitriptyline concentrations over different time intervals helps determine its lethal concentration 50.
03:26
Electroencephalography-Based Recording Technique to Record the Epileptiform Activity
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2025
This video describes the technique for recording the epileptiform activity of rhinal cortex-hippocampus organotypic slices ex vivo using electrophysiology or EEG set-up. This helps to study the dynamics and progression of epileptogenesis and screen potential therapeutic targets to treat epilepsy.
FAQs
A missing individual cannot automatically be treated as dead. Separating confirmed deaths from animals or organisms that are lost to follow-up, as well as from those still alive at the study’s end, prevents the record from misrepresenting survival. This distinction is essential when researchers estimate mortality rates or compare lifespan patterns among biological populations.
Recording when death occurs allows researchers to place each event within the population’s observation period and evaluate survival over time. Documenting circumstances adds biological context, helping relate mortality to disease, environmental effects, or experimental treatment. Together, these records support survival analysis and life-table construction rather than relying only on a final count of deaths.
Consistent mortality records make it possible to compare survival and mortality patterns between populations exposed to different conditions or experimental treatments. Researchers can examine whether deaths occur more frequently or at different points in the observation period. Such comparisons help assess treatment effects and identify how biological or environmental factors may influence population survival.
A study begins by establishing the biological population to be observed. Researchers then monitor its individuals at set intervals and record the timing and circumstances of each confirmed death. At every assessment, they also distinguish individuals that remain alive from those lost to follow-up. These classifications create the records needed for later survival and mortality calculations.
The resulting records can describe survival, lifespan, mortality rates, and changes in population size or composition over the observation period. They also provide the foundation for life tables, which organize mortality and survival information systematically. These outcomes help researchers evaluate patterns rather than treating deaths as isolated events without population-level context.
Biologists apply mortality recording when studying disease effects, environmental change, experimental treatments, aging, or population dynamics. It can support comparisons between populations and help evaluate how conditions influence survival. In ecological research, repeated mortality information contributes to understanding population change, while in aging studies it helps characterize lifespan patterns across the observed population.