Luminometer Measurement
Luminometer Measurement - Related Videos
03:23
Measurement of the In Vivo Burden of Bacteria Expressing Luciferase in an Insect Larva
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2025
This video showcases the in vivo bacterial burden measurement using Bacillus Calmette-Guérin, BCG, lux-infected insect larvae. The process involves larval homogenization, treatment with a luciferase substrate, and bioluminescence measurement to determine relative light units that correlate with bacterial burden.
03:38
Measuring Mycobacterium smegmatis Mistranslation Rates Using a GFP/Luciferase Reporter System
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2025
Source: Chen, Y., et al., Measurement of Specific Mycobacterial Mistranslation Rates with Gain-of-function Reporter Systems. J. Vis. Exp. (2019)This video demonstrates a method to quantify mistranslation in Mycobacterium smegmatis using an inducible GFP and secreted mutant luciferase reporter system. It shows how luminescence resulting from mistranslation is measured and compared to GFP fluorescence to evaluate the impact of a test molecule on translational accuracy.
07:22
Standardized Method for Measuring Collection Efficiency from Wipe-sampling of Trace Explosives
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Cited by 7 •
2017
Optimized sampling protocols and the development of new wipe materials can be facilitated by standardized measurements of collection efficiency from wipe-sampling. Our approach for sampling trace explosives uses an automated device to control speed, force, and distance during wipe-sampling followed by extraction of collected explosives.
12:16
Quantitative Measurement of the Immune Response and Sleep in Drosophila
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Cited by 17 •
2012
To understand a link between the immune response and behavior, we describe a method to measure locomotor behavior in Drosophila during bacterial infection as well as the ability of flies to mount an immune response by monitoring survival, bacterial load, and real-time activity of a key regulator of innate immunity, NFκB.
02:36
The Luciferase Assay: A High-Throughput Assay to Measure Luminescent Signals Using Engineered Nanoluciferase System-Based Bioreporters
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2025
The video demonstrates the luciferase assay used to quantify luciferase-tagged proteins. The assay uses an engineered luciferase enzyme composed of a large fragment that binds with the small fragment, which is conjugated with a protein of interest. The bound subunits form an active enzyme that, in the presence of the substrate, releases a luminescent signal. This signal is then quantified using a luminometer.
FAQs
The detector determines how emitted light becomes a measurable result. A photomultiplier tube or photodiode captures photons from the reaction and converts that optical signal into a numerical reading. This conversion allows researchers to analyze very small changes in light output and relate them to molecular or cellular activity in biological samples.
Luciferase provides a reaction that generates bioluminescence when a suitable substrate is available. The resulting light gives the luminometer a signal that can be quantified and associated with the biological process under investigation. Changing reporter expression, enzyme activity, or another measured condition can therefore produce a corresponding change in the recorded light output.
Light output can serve as an indirect measure when the intensity of the signal correlates with the amount of an analyte or with biological activity. For example, a stronger or weaker reading may indicate differences in reporter gene expression, ATP levels, enzyme activity, cell viability, or signaling pathway activity, depending on the assay design.
A typical workflow selects a biological reaction that produces measurable light, supplies the appropriate substrate when a luciferase reaction is used, and places the resulting sample in the luminometer. The instrument detects emitted photons and converts them into a numerical value. Researchers then interpret that value in relation to the molecular or cellular activity being assessed.
Luminometer measurement supports several assay types, including reporter gene expression, ATP quantification, enzyme activity, cell viability, and signaling pathway analysis. Each application links light production to a different biological readout. This flexibility allows the same measurement approach to examine gene regulation, cellular energy status, catalytic reactions, survival, or pathway responses.
Its sensitivity allows luminometry to detect signals associated with molecular and cellular activity, while numerical readings support systematic analysis across many samples. That combination makes the approach suitable for high-throughput assays, in which researchers evaluate biological responses efficiently. In drug development, these measurements can help examine enzyme activity, cell viability, reporter responses, or signaling changes.