Fluorometer Analysis
Fluorometer Analysis - Related Videos
09:12
G Protein-selective GPCR Conformations Measured Using FRET Sensors in a Live Cell Suspension Fluorometer Assay
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Cited by 4 •
2016
Simple methods to detect the selective activation of G proteins by G protein-coupled receptors remain an outstanding challenge in cell signaling. Here, Fӧrster resonance energy transfer (FRET) biosensors have been developed by pairwise tethering a GPCR to G protein peptides to probe conformational changes at controlled concentrations in live cells.
07:03
Measuring Photophysiology of Attached Stage of Colacium sp. by a Cuvette-Type Fast Repetition Rate Fluorometer
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Cited by 1 •
2021
Fast repetition rate fluorometer (FRRf) is a beneficial method for measuring photosystem II photophysiology and primary productivity. Here we describe a protocol to measure PSII photophysiology of epizoic alga, Colacium sp. on substrate zooplankton using cuvette-type FRRf.
15:04
A Neuronal and Astrocyte Co-Culture Assay for High Content Analysis of Neurotoxicity
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Cited by 46 •
2009
This article describes a novel protocol and reagent set designed for sensitive measurement of neurotoxic effects of compounds and treatments on co-cultures of neurons and astrocytes using high content analysis. Results demonstrate that high content analysis represents an exciting novel technology for neurotoxicity assessment.
10:39
Automated Analysis of Intracellular Phenotypes of Salmonella Using ImageJ
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Cited by 3 •
2022
Salmonella invades and replicates inside intestinal epithelial cells both in Salmonella-specific vacuoles and free in the cytosol (hyper-replication). A high-throughput fluorescence microscopy-based protocol is described here to quantify the intracellular phenotypes of Salmonella by two complementary image analyses through ImageJ, reaching single-cell resolution and scoring.
11:24
High-throughput Imaging and Analysis Workflow for Evaluating Skin Cell Phenotypes and Proliferation States in Tissue Samples
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Cited by 1 •
2025
The combination of iterative-bleaching-extends-multiplexity (IBEX) and a commercial nucleotide labeling assay (Click-iT EdU) enables the detection and categorization of dividing cell types in highly dynamic processes in fixed frozen murine tissue sections. Furthermore, a novel open-source image processing pipeline provides high-throughput image acquisition and analysis.
FAQs
Separating excitation light from emitted light allows the instrument to attribute the recorded signal to fluorescence rather than to the incoming illumination. Wavelength selection also provides chemical information because the measurement records how strongly a sample emits after absorbing light. This separation supports more selective analysis of fluorescent compounds and helps relate molecular behavior to observed intensity.
Calibration establishes how measured fluorescence intensity changes with analyte concentration under controlled conditions. Researchers can then compare the signal from an unknown sample with that relationship to support quantitative analysis. Because the connection depends on measurement conditions, maintaining consistent excitation, emission, and sample conditions is important when converting fluorescence readings into concentration information.
Quenching decreases fluorescence intensity through effects associated with the sample environment or molecular interactions. Consequently, a lower signal does not necessarily indicate a lower amount of fluorescent analyte. In chemistry, examining quenching can provide information about molecular behavior and environmental effects, while recognizing it as a factor that may influence quantitative interpretation.
The method combines high sensitivity with selectivity for fluorescent compounds. Sensitivity helps detect and measure relatively weak emission signals, while wavelength-based excitation and emission measurements provide a way to distinguish fluorescence responses associated with particular chemical systems. This combination makes the technique useful when researchers need quantitative information alongside insight into molecular behavior.
A measurement directs excitation light at the sample, collects the resulting emitted light, separates that emission by wavelength, and records its intensity. Under controlled conditions, the recorded value can be compared with a calibration relationship for quantitative analysis. This workflow links the optical response to chemical composition while preserving information about the sample’s fluorescence behavior.
When reaction progress changes the presence or behavior of fluorescent compounds, fluorescence intensity can be measured at successive stages and used to track those changes. The resulting pattern provides a way to follow chemical transformation over time. This application is especially relevant in analytical chemistry, where optical measurements can connect evolving molecular behavior with reaction progress.
Fluorometer measurements support several chemistry applications, including quantitative analysis of fluorescent compounds, biochemical research, and materials characterization. They also help investigate molecular interactions and environmental effects such as quenching. These uses extend beyond concentration measurement because the fluorescence response can reveal changes in chemical composition and molecular behavior under different conditions.