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pH levels vary among bacterial species. For example; acidophillic bacteria grow best at low pH. While alkalophiles grow better at alkaline (high) pH. Most bacteria grow best at high aw (>0.90). While few bacterial species such as xerophiles grow best at an aw of 0.6-0.7
Chauncey Kihn
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What cause bacteria to grow on Water Dispensers?
scum
Why do bacteria need water to grow?
Most bacteria does not need water to survive.
What is stomatolite?
collections of bacteria which grow in water and form stony lumps
Does Bacteria grow on fat?
No, bacteria do not grow on fat
What is the temperature grow in bacteria?
There are a few different temperatures that allow you to grow bacteria. Warm temperatures tend to grow bacteria rather well.
What pH water activity levels do bacteria grow?
pH levels vary among bacterial species. For example; acidophillic bacteria grow best at low pH. While alkalophiles grow better at alkaline (high) pH. Most bacteria grow best at high aw (>0.90). While few bacterial species such as xerophiles grow best at an aw of 0.6-0.7
What pH and water activity (aw) levels do bacteria grow best?
pH levels vary among bacterial species. For example; acidophillic bacteria grow best at low pH. While alkalophiles grow better at alkaline (high) pH. Most bacteria grow best at high aw (>0.90). While few bacterial species such as xerophiles grow best at an aw of 0.6-0.7
Does bacteria grow quickly with potential hazardous foods with water activity .85 or higher?
Yes
Is it safe to eat feta cheese that is older than 6 weeks?
Probably not. Feta cheese is a soft cheese, which means there is a relatively high level of water activity in the final product. This high water activity means that there should be enough water in the product for some bacteria to grow. Over the course of one year, the bacteria in the cheese and any bacteria that may have contaminated the cheese would have had plenty of time to multiply to dangerous levels.
What are the benefits of high water activity?
It is easy to see the shortfalls of high water activity when you look at water activity only as a way to control the growth of bad bacteria, but what if you want bacteria to actually grow in your product? The other thing is that texture depends upon water activity, so if you need to change your texture, you could raise the water activity. Another thing that is important to remember is that browning reactions occur at different water activities and you can change the water activity to control browning reactions.
Bacteria do not grow well in food with high levels of moisture such as meat and cheese?
It is a false statement that bacteria do not grow well in food with high levels of moisture such as meat and cheese.
How does jam last for months?
Due to the high sugar content, the water activity is so low that bacteria will not grow. However, if given the opportunity, molds will grow on the surface.
What is the relationship between microbial growth and water activity?
Bacteria need water to stay alive that is why a very dry surface (or beef jerky) have no growing bacteria. Note that is for growing bacteria. If the surface or food gets wet, they can to begin to grow.
Is it possible for mold or bacteria to grow in an unopened organic snack bar if it was processed properly?
Being organic would have nothing to do with it. If the snack bar was not made properly with the appropriately low water activity, mold or bacteria could grow.
What laboratory apparatus will determine if a bacteria is alive or not?
One method is a petri dish because the bacteria would grow or not grow in a warm environment. Or a microscope because you could see any activity of the bacteria.
What cause bacteria to grow on Water Dispensers?
scum
What is the job of the bacteria bacillus?
It is to survive under severe conditions and grow under most other conditions. I can grow in soil and grow in water. When very dry I die leaving spores behind ready to grow when conditions are right. I can scavenge a living growing at times of very low food levels
