Continuous Culture Selection
Continuous Culture Selection - Related Videos
01:14
Batch vs Continuous Culture
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2026
Fermentation is a foundational biotechnological process used to produce pharmaceuticals, biofuels, enzymes, and food additives. Among industrial strategies, batch and continuous fermentation are the two most widely applied. Although both rely on microbial conversion of substrates into desired products, they differ markedly in operation, productivity, and suitability for specific applications.Batch fermentation occurs in a closed system in which nutrient media and inoculum are added at the...
09:35
Enrichment Cultures: Culturing Aerobic and Anaerobic Microbes on Selective and Differential Medias
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2023
Source: Christopher P. Corbo1, Jonathan F. Blaize1, Elizabeth Suter1 1 Department of Biological Sciences, Wagner College, 1 Campus Road, Staten Island NY, 10301 Prokaryotic cells are able to inhabit nearly every environment on this planet. As a kingdom, they possess a great metabolic diversity, allowing them to use a wide variety of molecules for energy generation (1). Therefore, when cultivating these organisms in the lab, all necessary and specific molecules required to make energy must be...
01:22
Continuous Culture of Bacteria at Constant Density via Automated Growth Rate Estimation
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2025
Begin with a turbidostat, a device that maintains a constant cell density in culture.The device contains a vessel with a bacterial culture, which is continuously aerated by stirring and maintained at a constant temperature.A laser diode emits a light beam that is split into two paths.One path is directed to a reference sensor to monitor laser intensity fluctuations, while the other passes through the culture.Bacterial cells scatter and absorb light, decreasing the transmitted intensity, which...
09:40
Batch and Continuous Bioreactors
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2023
Bioreactors are used to grow organisms in large volumes, thereby enabling the production of mass quantities of the target product. These reactors can be batch reactors, which contain all of the components needed for cell growth, or continuous reactors, which have inlet and outlet ports allowing for the addition of fresh growth media and the removal of cell waste. This video presents batch and continuous reactors and demonstrates the use of bioreactors to grow bacteria in the laboratory.
05:58
Selectively Removing Microglia from a Rat Cerebellar Granule Neuron Culture
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2025
This video demonstrates a technique for the selective removal of microglia from a primary rat neuronal culture. Cerebellar granule neurons are treated with an antimetabolite to eliminate proliferating glial cells. Additionally, they are treated with lysosome-targeting agents to deplete microglia from the culture.
FAQs
Selection arises from the relationship between cellular growth and the rate at which culture contents are removed. Under the chosen nutrient or environmental pressure, organisms that continue growing quickly enough remain represented, while slower-growing or less-tolerant organisms decline and may wash out. This makes the culture a controlled setting for observing competition and enrichment.
The dilution rate determines how quickly fresh medium replaces the culture and how rapidly cells and waste leave. It therefore influences whether organisms can maintain their population under selection. Changing this rate can alter the competitive balance, allowing researchers to examine growth performance and identify organisms that persist under the specified renewal conditions.
Each condition creates a different environmental pressure and favors organisms with matching physiological capabilities. Nutrient limitation can enrich organisms that use the available resource effectively, whereas altered temperature or oxygen availability can favor stress-tolerant populations. Selecting one or more pressures helps researchers connect environmental conditions with growth, persistence, and microbial competition.
Researchers first establish a growing microbial population in a culture system, then continuously provide fresh medium while removing an equal volume containing cells and waste. They set the relevant conditions, such as nutrient availability, dilution rate, temperature, or oxygen availability, and observe which organisms persist under those controlled pressures.
Changes in the organisms that persist can provide evidence about competition, adaptation, and evolution under defined environmental pressures. The method helps researchers determine whether populations become enriched for faster growth, greater metabolic activity, or improved stress resistance. These outcomes connect environmental selection with changes in the biological traits represented in the culture.
This approach is useful when researchers want to enrich microbial strains with improved growth, metabolic activity, stress resistance, or production of valuable biological compounds. It also supports studies of microbial competition and adaptation under controlled conditions. By maintaining a defined pressure over time, investigators can focus on organisms that display the desired performance.