A professional who tends series of tanks to inoculate molasses wort with pure yeast culture to produce seed yeast for use in production of baker's yeast. Respnsibilities include:

• Pours molasses wort and chemicals into tank, according to formula, and adds yeast culture from flask.
• Observes thermometer on tank and opens valves to allow water to circulate in coils of tank to maintain specified temperature.
• Pumps air into tank to aerate yeast.
• Tests specific gravity of yeast, using hydrometer, and tests acidity of yeast, using pH meter.
• Adds required chemicals to adjust acidity when necessary.
• Pumps wort to successive tanks as yeast growth progresses.
• Submits samples of wort to laboratory for analysis.