Which French physicist and engineer experimented with yeast activity at various temperatures?

Which French physicist and engineer experimented with yeast activity at various temperatures?

• A. Cagniard de la Tour
• B. Louis Pasteur
• C. Antoine Lavoisier
• D. Jean-Antoine Chaptal

Answer: (A)

Temperature governs how fast yeast works and what it produces during fermentation. Louis Pasteur showed that fermentation is carried out by living yeast cells, and that the rate of this biological process changes with temperature. At moderate temperatures, yeast enzymes operate efficiently and fermentation proceeds smoothly. If the temperature is too low, metabolic activity slows and fermentation drags; if it gets too high, enzymes can be stressed or damaged and the process falters. Pasteur’s experiments linking yeast activity to temperature laid the foundation for both selecting appropriate fermentation conditions in winemaking and for later ideas like pasteurization, where heat is used to control unwanted microbes while preserving the desired fermentation.

Temperature governs how fast yeast works and what it produces during fermentation. Louis Pasteur showed that fermentation is carried out by living yeast cells, and that the rate of this biological process changes with temperature. At moderate temperatures, yeast enzymes operate efficiently and fermentation proceeds smoothly. If the temperature is too low, metabolic activity slows and fermentation drags; if it gets too high, enzymes can be stressed or damaged and the process falters. Pasteur’s experiments linking yeast activity to temperature laid the foundation for both selecting appropriate fermentation conditions in winemaking and for later ideas like pasteurization, where heat is used to control unwanted microbes while preserving the desired fermentation.