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Related Concept Videos

Globular and Fibrous Proteins02:21

Globular and Fibrous Proteins

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Many proteins can be classified into two distinct subtypes - globular or fibrous. These two types differ in their shapes and solubilities.
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A decreasing function describes a relationship where the output consistently declines as the input increases. This means that for any two input values, if one is greater than the other, the corresponding output is smaller. Mathematically, a function f is decreasing on an interval I if for every x1 < x2​ in I, f (x1) > f (x2). This type of behavior is visually identified on a graph that slopes downward from left to right.The nature of a function can be analyzed by calculating...
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Fibrous Proteins00:55

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Fibrous proteins are either long and narrow proteins or assemble to form long and thin structures. They contain repetitive units and usually consist of either alpha helices or beta sheets and, in rare cases, a mix of both. The amino acids in the primary structure often consist of repeating amino acid sequences. The role of fibrous proteins is primarily structural. Many are located in the extracellular matrix and are present in connective tissues to impart strength and joint mobility. They are...
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The shape of a small drop of liquid can be considered spherical, neglecting the effect of gravity. This drop can further be considered as two equal hemispherical drops put together due to surface tension. The forces acting on the spherical drop are due to the pressure of the liquid inside the drop, the pressure due to air outside the drop, and the force due to the surface tension acting on the two hemispherical drops.
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A decreased body temperature can occur in patients with hypothermia and frostbite. Heat loss with extended cold exposure overpowers the body's ability to create heat, resulting in hypothermia. Core temperature readings help classify hypothermia. Mild hypothermia is temperatures between 32 °C (89.6 °F) and 35°C (95 °F) and is caused by impaired thermoregulation. Moderate hypothermia is temperatures between 28 C (82.4 °F) and 32 °C (89.6 °F) caused by...
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Related Experiment Video

Updated: Jan 31, 2026

Coupling Carbon Capture from a Power Plant with Semi-automated Open Raceway Ponds for Microalgae Cultivation
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Developing microporous fibrous-diaphragm aerator to decrease bubble generation diameter for improving microalgal

Jun Cheng1, Yanmei Song1, Wangbiao Guo1

  • 1State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China.

Bioresource Technology
|January 4, 2019
PubMed
Summary
This summary is machine-generated.

A new fibrous-diaphragm aerator (FDA) improves microalgal growth by creating smaller bubbles and longer residence times. This novel aeration method enhances CO2 fixation and biomass yield in raceway ponds.

Keywords:
Bubble generationFibrous-diaphragm aeratorMass transferMicroalgae biomassMicropores

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Area of Science:

  • Biotechnology
  • Environmental Engineering
  • Algal Cultivation

Background:

  • Efficient aeration is crucial for microalgal cultivation, impacting CO2 fixation and biomass production.
  • Traditional aeration methods often suffer from large bubble sizes and short residence times, limiting gas-solution mass transfer.
  • Optimizing aeration can significantly enhance the productivity of microalgal systems.

Purpose of the Study:

  • To introduce and evaluate a novel microporous fibrous-diaphragm aerator (FDA) for improved microalgal cultivation.
  • To investigate the effect of FDA design parameters, specifically internal support installation angle and pore size, on aeration performance.
  • To compare the efficiency of the FDA with traditional strip aerators in terms of gas-solution mixing and microalgal growth.

Main Methods:

  • A novel microporous fibrous-diaphragm aerator (FDA) was designed with a check valve to generate pressurized gas through micropores.
  • The study systematically varied the installation angle of the FDA's internal support (0° to 45°) and evaluated bubble characteristics.
  • Performance was assessed by measuring bubble generation time, diameter, gas-solution mixing time, mass transfer coefficient, and microalgal (Arthrospira) growth parameters.

Main Results:

  • The optimal installation angle for the FDA was found to be 22°, resulting in minimal bubble generation time (4 ms) and diameter (0.45 mm).
  • Compared to traditional strip aerators, the FDA at 22° reduced bubble generation time by 50% and diameter by 60%.
  • The FDA enhanced gas-solution mixing time by 22%, increased the mass transfer coefficient by 40%, boosted photochemical efficiency by 80%, and increased biomass yield by 38.5%.

Conclusions:

  • The microporous fibrous-diaphragm aerator (FDA) significantly improves aeration efficiency for microalgal cultivation.
  • Optimized FDA design, particularly the installation angle and pore size, enhances CO2 delivery and mass transfer.
  • The FDA technology offers a promising approach for increasing the productivity and efficiency of Arthrospira cultivation in raceway ponds.