Section 608 of the Federal Clean Air Act requires that all persons who maintain. must be certified as Universal technicians. Should EPA regulations change after a technician becomes certified. or 18 out of 25 correct.
Effect of freeze-drying on the viability of selected probiotic organisms is shown in Table 1. Freeze drying had a deleterious effect on the viability of all probiotic organisms. In general, Bifidobacterium spp. had 7% higher survival than Lactobacillus spp. with the exception of B. longum 1941.
Controlled freeze drying keeps the product temperature low enough during the process to avoid changes in the dried product appearance and characteristics. It is an excellent method for preserving a wide variety of heat-sensitive materials such as proteins, microbes, pharmaceuticals, tissues & plasma.