Fluorescence Viability Monitoring
Fluorescence Viability Monitoring - Related Videos
02:38
Fluorescence-Based Viability Assessment of Oral Anaerobic Bacteria
0 Views •
2026
Source: Calatayud Arroyo, M., et al. Assessing the Viability of a Synthetic Bacterial Consortium on the In Vitro Gut Host-microbe Interface. J. Vis. Exp. (2018)The video demonstrates a method to evaluate the viability of anaerobic oral bacteria using fluorescent dyes and flow cytometry. It begins with culturing bacteria in oxygen-free broth, followed by resuspending a single colony from a blood agar plate. After incubation and dilution, the culture is stained with membrane-permeable and...
07:23
Fluorescence Microscopy Methods for Determining the Viability of Bacteria in Association with Mammalian Cells
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Cited by 82 •
2013
Central to the field of bacterial pathogenesis is the ability to define if and how microbes survive after exposure to eukaryotic cells. This article outlines protocols for the use of fluorescent dyes that reveal the viability of individual bacteria inside and associated with host cells.
10:04
Using Fluorescent Proteins to Monitor Glycosome Dynamics in the African Trypanosome
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Cited by 4 •
2014
Glycosome dynamics in African trypanosomes are difficult to study by traditional cell biology techniques such as electron and fluorescence microscopy. As a means of observing dynamic organelle behavior, a fluorescent-organelle reporter system has been used in conjunction with flow cytometry to monitor real-time glycosome dynamics in live parasites.
12:03
Viability Assays for Cells in Culture
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Cited by 39 •
2014
Therapeutic compounds are often first examined in vitro with viability assays. Blind cell counts by a human observer can be highly sensitive to small changes in cell number but do not assess function. Computerized viability assays, as described here, can assess both structure and function in an objective manner.
05:47
Counting and Determining the Viability of Cultured Cells
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Cited by 19 •
2008
Determining the number of cells in culture is important in standardization of culture conditions and in performing accurate quantitation experiments. In this video, we demonstrate how cells are counted using a hemacytometer.
FAQs
The key signal difference comes from how cells handle fluorescent probes when their membranes are intact or compromised. An intact membrane can retain one probe, whereas damage permits another probe to enter, producing contrasting fluorescence patterns. Measuring these signals helps separate viable-cell behavior from membrane damage and reveals how a treatment or culture condition affects cell survival.
Membrane integrity and metabolic activity report different aspects of cell condition. A membrane-based signal focuses on structural damage, while a metabolic marker can indicate whether cells remain functionally active. Combining these types of evidence can provide a broader view of cellular status, which is useful when bioengineering conditions may cause stress before obvious membrane failure appears.
Longitudinal fluorescence measurements show how viability changes during an experiment rather than only describing the final state. This time-resolved view can reveal emerging stress, progressive toxicity, or changing survival patterns and helps distinguish transient effects from sustained deterioration. In process development, those trends can guide adjustments before an engineered culture or construct reaches an unsuitable endpoint.
A typical workflow exposes cells to fluorescent probes and then records the resulting signals with an imaging system or plate reader. Measurements can be collected from individual locations or broader sample populations, depending on the instrument. Comparing signal patterns across conditions and time points provides quantitative evidence for membrane damage, metabolic status, and survival trends.
Bioengineers can apply the method while optimizing cell culture conditions, because it provides evidence of toxicity, stress, and survival during process changes. Repeated measurements help identify whether a condition supports sustained cell health rather than merely producing acceptable results at one endpoint. This information can guide development before moving toward more complex engineered systems.
Fluorescence viability monitoring can compare how cells respond to different biomaterials, bioreactor conditions, or tissue-construct designs. Signals associated with membrane integrity and cellular activity indicate whether the surrounding engineered environment supports survival or contributes to damage and stress. These comparisons help connect design or operating conditions with biological outcomes during bioengineering development.