Yeast Fermentation
Yeast Fermentation - Related Videos
14:53
Techniques for the Evolution of Robust Pentose-fermenting Yeast for Bioconversion of Lignocellulose to Ethanol
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Cited by 4 •
2016
Adaptive evolution and isolation techniques are described and demonstrated to yield derivatives of Scheffersomyces stipitis strain NRRL Y-7124 that are able to rapidly consume hexose and pentose mixed sugars in enzyme saccharified undetoxified hydrolyzates and to accumulate over 40 g/L ethanol.
01:29
Fermentation
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2019
Most eukaryotic organisms require oxygen to survive and function adequately. Such organisms produce large amounts of energy during aerobic respiration by metabolizing glucose and oxygen into carbon dioxide and water. However, most eukaryotes can generate some energy in the absence of oxygen by anaerobic metabolism. Fermentation is a type of metabolic process that occurs in the absence of oxygen, where organic molecules such as glucose are broken down to produce energy. During this process, the...
03:14
Microaerobic Fermentation of Bamboo Hydrolysate by Klebsiella pneumoniae
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2025
Source: Wei, D., et al., Production of Chemicals by Klebsiella pneumoniae Using Bamboo Hydrolysate as Feedstock. J. Vis. Exp. (2017)This video demonstrates the microbial conversion of bamboo-derived sugars into 2,3-butanediol by culturing Klebsiella pneumoniae in a hydrolysate-based medium under microaerobic and mildly acidic conditions.
08:38
Novel Production Protocol for Small-scale Manufacture of Probiotic Fermented Foods
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Cited by 14 •
2016
A production protocol is described for the small-scale production of probiotic fermented dairy drink with the aid of a novel bacterial starter culture.
08:30
Yeast Maintenance
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2023
Research performed in the yeast Saccharomyces cerevisiae has significantly improved our understanding of important cellular phenomona such as regulation of the cell cycle, aging, and cell death. The many benefits of working with S. cerevisiae include the facts that they are inexpensive to grow in the lab and that many ready-to-use strains are now commercially available. Nevertheless, proper maintenance of this organism is critical for successful experiments. This video will provide an overview...
FAQs
NAD+ regeneration allows glycolysis to continue when oxygen is limited. During sugar breakdown, glycolysis requires NAD+ to support the reactions that produce ATP. Yeast converts pyruvate-derived acetaldehyde into ethanol, restoring NAD+ in the process. This connection explains how yeast can maintain ATP production under oxygen-poor conditions rather than stopping after the initial steps of glucose breakdown.
These compounds represent successive stages in the pathway after glycolysis. Glucose breakdown produces pyruvate, which yeast converts to acetaldehyde; acetaldehyde is then converted to ethanol. The final conversion also supports NAD+ regeneration, while the pathway releases carbon dioxide. Together, these intermediates connect sugar processing, continued ATP production, ethanol formation, and gas generation.
Limited oxygen shifts attention toward fermentation as a way to sustain energy production. Instead of relying on oxygen-dependent conditions, yeast uses the pyruvate-to-ethanol sequence to regenerate NAD+, allowing glycolysis to continue producing ATP. This makes yeast fermentation a useful biological example of how cells maintain energy generation when oxygen availability is low.
The products of the pathway support different practical goals. Carbon dioxide generation contributes to gas formation in baking, while ethanol production is central to brewing and relevant to biofuel production. These applications harness the same underlying cellular process but emphasize different outcomes: gas formation for food production and ethanol generation for beverages or energy-related uses.
Yeast fermentation provides a model for examining cellular metabolism under oxygen-poor conditions. Researchers can use it to consider how sugar breakdown connects with ATP production, NAD+ regeneration, ethanol formation, and carbon dioxide release. Because the process also relates to microbial growth, it supports biological investigations that link metabolic activity with changes in yeast populations.
Ethanol and carbon dioxide are the clearest outcomes associated with yeast activity, while continued glycolysis indicates that energy production can proceed through ATP formation. Their significance depends on the application: carbon dioxide matters for gas formation, ethanol matters for brewing and biofuels, and the pathway itself helps interpret metabolism and microbial growth in biology.