11. This led to Dr . Chenoweth publishing the first comprehensive textbook on Food Preservation . 12. Methods of food preservation were important, and practiced throughout China. 13. Hall also investigated the role of spices in food preservation . 14. Many processes designed to preserve food will involve a number of food preservation methods. 15. Various food preservation and packaging techniques are used to extend a food's shelf life. 16. Some methods of food preservation are known to create carcinogens. 17. Early scientific research into food technology concentrated on food preservation . 18. American inventor Clarence Birdseye developed the quick-freezing process of food preservation in the 20th century. 19. Food preservation tutorials are offered in Adobe Flash modules.20. Unfortunately for the Confederate States Army it was not a comparable method of food preservation .
