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Bioreactor Design and Operational System01:29

Bioreactor Design and Operational System

Bioreactors are engineered vessels designed to cultivate microorganisms under controlled conditions for industrial bioprocessing. They maintain sterility and allow precise regulation of pH, temperature, oxygen, and nutrient levels to optimize microbial growth and metabolite production. Bioreactors range from small laboratory units of 1 liter to industrial systems holding up to 500,000 liters, though only about 75% of their volume is actively used for fermentation. The remaining headspace...
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Bioreactor Controls-I

Maintaining optimal conditions within fermenters is essential for maximizing microbial productivity and ensuring process efficiency. This lesson focuses on key parameters—temperature, foam, pH, carbon dioxide, oxygen, and pressure—and their precise measurement and control strategies in fermentation systems.Temperature ControlTemperature regulation is critical due to the exothermic nature of many fermentation processes. In small laboratory fermenters, temperature is commonly monitored using...
Bioreactor Controls-II01:18

Bioreactor Controls-II

In aerobic fermentations, oxygen is vital for microbial growth and metabolite production. Since air comprises only about 20% oxygen and the gas is poorly soluble in water—just 9 ppm at 20°C—supplying sufficient oxygen becomes a critical challenge, especially in high-demand processes like yeast growth or citric acid production. Even a fully saturated broth may offer only a few seconds of oxygen availability.To address this, sterile or scrubbed air is introduced into the fermentor via a sparger...
Bioreactor Controls-III01:22

Bioreactor Controls-III

Strain improvement is a foundational strategy in industrial microbiology aimed at maximizing microbial productivity, particularly because natural isolates typically yield commercially valuable products in very low concentrations. Although optimizing the culture medium and environmental conditions can improve yields, these adjustments are inherently limited by the organism’s genetic potential. As a result, the focus shifts toward genetic modifications to enhance biosynthetic capacity. The...
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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...
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Microbial biosensors are analytical devices that utilize living microbes to detect specific substances through measurable signals. These devices consist of two main components: biosensing organisms and signal-transducing elements. Biosensing organisms, such as Escherichia coli or Saccharomyces cerevisiae, are typically housed in multiwell plates connected to transducers, enabling rapid, real-time detection of target analytes.Signal Generation MechanismWhen a target analyte—such as...

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Design and Use of Multiplexed Chemostat Arrays
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Published on: February 22, 2013

ModuloStat: An Internet of Things' Path to Continuous Cultures in Mini-Bioreactors.

Cyprien Guérin1, Etienne Dervyn2, Joséphine Véron1

  • 1Université Paris-Saclay, INRAE, MaIAGE, 78350 Jouy-en-Josas, France.

ACS Omega
|January 19, 2026
PubMed
Summary
This summary is machine-generated.

The ModuloStat, an open-source framework, simplifies continuous microbial culture using modular, Internet of Things-enabled mini-bioreactors. This system enhances experimental evolution and metabolic studies in microbiology labs.

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Area of Science:

  • Microbiology
  • Biotechnology
  • Bioengineering

Background:

  • Continuous culture is vital for microbial studies but complex to implement.
  • Existing protocols are not widely adopted in standard microbiology labs.

Purpose of the Study:

  • To present the ModuloStat, a modular, open-source framework for accessible continuous culture.
  • To enable advanced microbial cultivation using digital fabrication and programmable electronics.

Main Methods:

  • The ModuloStat utilizes modular printed circuit boards with microcontrollers and Wi-Fi connectivity.
  • Internet of Things principles guide autonomous sensor and actuator operation.
  • Sterility is maintained through autoclaving, and in-situ optical density monitoring is employed.

Main Results:

  • The framework facilitates various cultivation modes like chemostat and turbidostat.
  • A Bacillus subtilis strain ZB with a zero-biofilm phenotype was developed.
  • The system demonstrated versatility through multiple experimental cultures.

Conclusions:

  • ModuloStat offers a flexible and accessible solution for continuous microbial culture.
  • The framework integrates digital fabrication and IoT for advanced bioreactor applications.
  • This system can significantly benefit experimental evolution and metabolic research.