Explain the characteristics of chemical preservatives of food. Write general rules for chemical preservation.

Chemical preservatives play a crucial role in the field of food microbiology by preventing or slowing down the growth of microorganisms, thereby extending the shelf life of food products. These preservatives inhibit the activity of bacteria, yeasts, molds, and other spoilage organisms, as well as pathogens that can pose health risks. The characteristics of chemical preservatives vary, but they generally share certain properties that make them effective in preserving food.

1. Antimicrobial Activity:
   - Chemical preservatives must possess antimicrobial properties to inhibit the growth and reproduction of microorganisms. This includes bacteria, yeasts, and molds _________ __________ ____ _______ _______ _________ ________ _________ ___ _________.
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