Op 50 Bacteria
Op 50 Bacteria - Related Videos
08:26
Measuring the 50% Haemolytic Complement (CH50) Activity of Serum
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Cited by 90 •
2010
The classical pathway is activated by antibody and culminates in target cell lysis. The CH50 assay provides a measure of the complement activity of a serum sample. This video demonstrates the steps involved in determining the CH50 of a serum sample, the calculations and interpreting of results.
08:36
Modified ES / OP9 Co-Culture Protocol Provides Enhanced Characterization of Hematopoietic Progeny
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Cited by 12 •
2011
mStrawberry OP9 cells allow for complete evaluation of all ES-derived progeny from co-culture.
02:40
Isolation of Bacteria from the Mosquito Midgut
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2026
Source: Liu, X., et al. A Bacterial Oral Feeding Assay with Antibiotic-Treated Mosquitoes. J. Vis. Exp. (2020)This video demonstrates the dissection of the mosquito midgut to isolate gut bacteria. The midgut is extracted from the digestive tract, homogenized to release the bacteria, and plated on nutrient agar to culture bacterial colonies.
09:02
Visualizing Bacteria in Nematodes using Fluorescent Microscopy
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Cited by 20 •
2012
To study the mutualism between Xenorhabdus bacteria and Steinernema nematodes, methods were developed to monitor bacterial presence and location within nematodes. The experimental approach, which can be applied to other systems, entails engineering bacteria to express the green fluorescent protein and visualizing, using fluorescence microscopy bacteria within the transparent nematode.
03:54
Extraction and Purification of Plastoglobules from Photosynthetic Bacteria
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2025
Source: Shivaiah, K., et al. Plastoglobule Lipid Droplet Isolation from Plant Leaf Tissue and Cyanobacteria. J. Vis. Exp. (2022)The video demonstrates the isolation of plastoglobules from cyanobacteria. It begins with a culture of cyanobacteria and proceeds through cell disruption using mechanical force. The release of photosynthetic pigments indicates successful lysis. A sucrose step gradient is then used to separate cellular components by density, allowing low-density plastoglobules to form a...
FAQs
The uracil requirement limits OP50 growth, producing a relatively thin bacterial lawn rather than dense coverage. This growth pattern leaves the agar surface accessible to Caenorhabditis elegans while providing a consistent food source. The resulting balance supports routine worm culture and helps researchers maintain comparable feeding conditions across plates and experiments.
C. elegans collect OP50 from the agar surface through pharyngeal pumping, the rhythmic action that draws food into the worm. The ingested cells are then digested as nutrients, supporting worm development and reproduction. Because feeding directly connects the bacterial lawn with worm physiology, changes in bacterial availability can influence population maintenance and experimental consistency.
Controlling bacterial growth helps reduce variation in the conditions experienced by different worm populations. More consistent food availability supports better synchronization and makes comparisons more reliable in behavioral, genetic, developmental, and toxicity assays. OP50 therefore functions not only as nutrition, but also as a controlled experimental variable in C. elegans biology.
Researchers seed agar plates containing nematode growth medium with OP50 to create the bacterial lawn on which worms feed. The seeded plates provide a standardized culture environment for maintaining worm populations, supporting development, and enabling reproduction. Consistent preparation and control of the lawn help limit environmental differences between cultures and experimental groups.
OP50-supported cultures are used in studies that examine worm behavior, genetics, development, and toxicity. The bacteria sustain the populations needed for these experiments while providing a relatively standardized nutritional background. This arrangement allows researchers to focus measurements on the biological question of interest and reduces variation caused by inconsistent routine feeding conditions.
Using the same bacterial food source across worm cultures helps standardize a basic environmental condition. OP50 can support routine maintenance while its relatively thin lawn and controlled growth make feeding conditions more comparable between plates. This consistency is especially relevant when researchers synchronize populations or compare outcomes across behavioral, developmental, genetic, and toxicity experiments.