Physical Methods: Others

____ does not kill but reduces the temperature slowing chemical reactions, which then slows metabolism, and finally slows growth.

Cold

__________ is the drying out of vegetative cells exposed to normal room air; stops growth.

Desiccation

____________ is a method of microbial preservation; it combines freezing and drying to preserve bacterial cells in their viable state.

Lyophilization

RADIATION effects have TWO broad categories. What are they?

1) Ionizing 2) Non-Ionizing

______ Radiation have enough energy to knock electrons off of atoms.

Ionizing

____- ______ Radiation is higher energy than visible light but not high enough to be ionizing - can still cause damage.

Non-ionizing

What are the example(s) of Ionizing Radiation?

1) Gamma Rays 2) X-Rays

What are the example(s) of Non-Ionizing Radiation?

UV Light

_______ is using a strainer with pores large enough to let water/air through while keeping microbes out; viruses are large enough to be able to get through

Filtration

_______ ________ is a method using lots of sugar or salt as a way of dehydrating cells on food to prevent spoilage.

Osmotic Pressure