A professional who selects and cultivates yeast cells to develop pure yeast culture for brewing beer and malt liquors. Responsibilities include:

• Samples beer in fermenting stages to select specimens containing yeast cells having specific reproduction characteristics.
• Prepares cover glasses and slides with smears of yeast preparation taken from beer samples.
• Examines slides under microscope to isolate specific cells and record position of cells.
• Incubates slides to allow colonies of cells to form.
• Inoculates cells with hopped wort, using sterile needle to transfer cells from slides to flasks containing wort.
• Cultivates cells in flasks by incubation and propagates single cell cultures by transferring cells to additional flasks.
• Siphons developing yeast culture from flasks to tanks and pumps yeast culture from tanks to sterile barrels.
• Seals barrels with sterile bung and packs sealed barrels in dry ice to prevent yeast degeneration.
• Cleans and sterilizes equipment.