character: Dr. Johnson
topic: Preservation Methods in Food Chemistry
grade: 11
subject: Chemistry
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character: Professor Smith
topic: Applications of Food Additives in Preservation
grade: 11
subject: Chemistry
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character: Dr. Lee
topic: Chemical Reactions in Food Preservation Techniques
grade: 11
subject: Chemistry
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character: Ms. Chang
topic: Impact of Temperature Control on Food Shelf Life
grade: 11
subject: Chemistry
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