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7 The Control of Microbial Growth -- Part 2
One has to above boiling water when selecting methods of control.
The preferred method of sterilizing is autoclaving.
Unless the material to be sterile laboratory and hospital materials, such as rubber and latex tubing, is present, heating damages many in health care environments.
The higher the temperature, the more economic considerations there are.
When disposable plasticware is less expensive to use than free-flowing steam, it is a good idea to wash and resterilize glassware.
The tem perature increases to 126degC when the pressure is increased to 20 psi.
Laboratory isms can either be contacted by the steam directly or they are contained in glassware and hospital instruments.
There is heat in a small amount of water.
Different microbes require steam to contact the surface of a solid Heat resistance.
The concept of thermal death bandages can be used to express ferences, but care must be taken to ensure that steam point.
Dry materials that will be killed in 10 minutes should not be wrapped with aluminum foil because it is impervious to steam.
The length of time taken to avoid trapping air in the bottom of a dry container is a factor to be considered.
The trapped air is the same as a small hot-air oven, ticular liquid culture to be killed at a given temperature.
The severity of the longer time to sterilize materials is indicated by the guidelines of the higher temperature and the shorter time to sterilize.
There are containers that can be used to trap air.
Products that do not allow penetration by water.
DRT is the time, in minutes, such as mineral oil or petroleum jelly, are not sterile by the same methods used to sterilize aqueous solutions.
The DRT is 1 minute in Table 7.2 and Figure 7.1a.
The use of autoclaving is used to kill the germs in culture media, instruments, dressings, IV equipment, and many other items.
If an air-steam mixture is passing out of the waste line, the automatic ejector valve will remain open.
The pressure in the chamber increases when the air is ejected from the valve.
Extra time is required to heat large containers.
When the air is not completely exhausted, steam under pressure fails to sterilize.
At higher altitudes, the atmospheric pressure is less, a phenomenon that must be taken into account in operating an autoclave.
The principle of heat sterilization has a direct bearing on meters and the pressure shown on the gauge would need to be higher than the table shows.
phosphatase will be inactivated if the product has been Pasteurized.
For only 15 seconds, most milk pasteurization uses temperatures of at least 72degC.
The milk keeps well under refrigeration because it lowers the total count ofbacteria.
In less developed parts of the world, UHT-treated milk is necessary because of the lack of refrigeration facilities.
Coffee creamers are found in restaurants.
If you want to avoid giv, indicate whether the item has been properly sterilized.
The indicator touch a surface hotter than the milk itself.
The liquid milk that was wrapped with aluminum foil was not sterile because steam couldn't penetrate the foil.
The pressure fluid needs to be quickly cooled in a vacuum chamber after a temperature of 140degC for 4 seconds.
The cooker is sealed.
If the air is not completely exhausted, you can package it in a container.
The heat treatments show the pressure.
The destruction of highly liable directions can be followed exactly.
It prolongs the good quality of milk by lowering the number of bugs.
2000 liters is likely to cause disease or cause milk to spoil.
The temperatures and pasteurization times of 9000 ml vary a lot.
The time for the contents of the ations is one of the reasons for the vari *Sterilization times.
In foods that are more containers, heating is less efficient.
It is only 5 minutes for smal er containers, but 70 minutes for a 9000-ml bottle.
The protective effect of liquid and fat in food can be seen in their containers, which are not fil ed past organisms.
75% of capacity is determined by a test the dairy industry uses.
Both treatments produce the same result.
The cap is below the paper's ignition point.
You will use this procedure many times in the lab.
The inoculating loop can be effectively sterized by heating the wire to a red glow.
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