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Related Concept Videos

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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...
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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...
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Related Experiment Video

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Quantitative and Temporal Control of Oxygen Microenvironment at the Single Islet Level
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Quantitative and Temporal Control of Oxygen Microenvironment at the Single Islet Level

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Oxygen control with microfluidics.

Martin D Brennan1, Megan L Rexius-Hall, Laura Jane Elgass

  • 1UIC Bioengineering (MC 563), 820 S Wood St W103 CSN, Chicago, IL 60612, USA. mbrenn3@uic.edu.

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PubMed
Summary

Microfluidic platforms offer precise control over oxygen tension for studying cellular behavior. These advanced systems overcome limitations of traditional methods, enabling better understanding of oxygen

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Area of Science:

  • Cell Biology
  • Biomedical Engineering
  • Physiology

Background:

  • Cellular function is critically dependent on oxygen tension (partial pressure of O2) in the microenvironment.
  • Deviations from physiological oxygen levels (normoxia), such as hypoxia or hyperoxia, trigger significant biological responses, impacting cell behavior, proliferation, and disease development.
  • Existing methods like hypoxia chambers lack the spatial control and precise microscale regulation needed to mimic in vivo conditions.

Purpose of the Study:

  • To review the applications of microfluidic systems for controlling and studying cellular responses to oxygen tension.
  • To provide background on microscale transport phenomena relevant to oxygen control.
  • To discuss methods for measuring and manipulating oxygen levels within microfluidic devices.

Main Methods:

  • Microfluidic platforms are employed to overcome limitations of traditional hypoxia chambers, offering enhanced spatial control and integration with microscopy.
  • Techniques for measuring oxygen tension within microfluidic channels are discussed.
  • Various methods for oxygen control are explored, including diffusion, mixers, cellular oxygen consumption, chemical reactions, and on-chip electrolysis.

Main Results:

  • Microfluidic systems enable precise spatial and temporal control over oxygen gradients, crucial for studying cellular responses.
  • These platforms facilitate the investigation of how varying oxygen levels influence stem cell behavior and pathological conditions like tumorigenesis and cardiovascular disease.
  • The review highlights the development of innovative on-chip oxygen control strategies.

Conclusions:

  • Microfluidic technology provides a powerful tool for precisely controlling oxygen microenvironments, advancing the study of cell biology and disease.
  • These systems offer superior capabilities compared to conventional methods for investigating oxygen-dependent cellular processes.
  • The reviewed techniques pave the way for more sophisticated research into oxygen's role in health and disease.