using physical or chemical agents to destroy microbes or their products, on inert objects or nonliving materials.
chemical agents used in disinfection
Chemical agents used to destroy or inhibit pathogenic microbes on tissue
Use of antiseptics to destroy vegetative pathogens.
Removing microbes from eating utensils or food contact surfaces
methods employed to prevent microbial contamination.
4 factors that
Influence the Effectiveness of Antimicrobial Agents
Alteration of Membrane Permeability - Damage to ?? allows ? to leak out and/or toxic materials to enter cell.
Damage to cell membrane allows cytoplasm to leak out and/or toxic materials to enter cell.
A are a significant portion of cell components. Damage to B prevent normal A synthesis. Alteration of these existing components will also quickly halt cellular function.
Breaking thebonds along the protein chain that amino acid chain in its 3-dimensional shape. The protein then assumes abnormal configuration which results in loss of function. Some chemicals bind to the active sites of proteins and prevent their proper function
??- breaking bonds along the protein chain that hold the ?? chain in its ? shape. Protein then assumes an abnormal configuration which results in loss of function. Some chemicals bind to the active sites of proteins and prevent their proper function.
The length of time required to kill all microbes at a specific temperature.
Mode of Action: ??. Presence of water enhances the process and facilitates heat transfer. Moist heat also can damage ?,?,and?.
3 examples of moist heat
Examples of dry heat
used to disinfect liquids to kill pathogens and reduce spoilage microbes without altering the quality of the product. The various pasteurization processes use very high temps and short exposure times, followed by rapid cooling. This is not a sterilization process.
? -application of steam under pressure, temperature of ? increases as ? increases. A a reinforced chamber into which materials to be sterilized are sealed. Air is then removed and steam is pumped in under pressure.