Question: What Factors Affect The Growth Of Bacteria In General?

What are the factors affecting the growth of bacteria?

The growth of microorganisms in the body, in nature, or in the laboratory is greatly influenced by temperature pH, moisture content, available nutrients, and the characteristics of other organisms present..

What is the best way to limit growth of bacteria in food?

To keep foods safe, remember to keep foods out of the Temperature Danger Zone, and if your food sits out, make a habit of getting your cold food in the refrigerator within two hours. Your hot food should be cooled quickly and put away in that timeframe as well.

Which of these is not required for bacteria to grow and multiply?

FOOD-MOISTURE-TIME-TEMPERATURE-OXYGEN All bacteria need is food and moisture to survive. Time; we know is needed, to allow them to multiply. The temperature has to be right for the specific type of bacteria, but most like temperatures within what we call the ‘danger zone’.

How do bacteria and viruses cause disease?

Infection occurs when viruses, bacteria, or other microbes enter your body and begin to multiply. Disease, which typically happens in a small proportion of infected people, occurs when the cells in your body are damaged as a result of infection, and signs and symptoms of an illness appear.

What was the first type of bacteria on Earth?

Cyanobacteria, also known as blue-green algae, started out on Earth quite a while ago. Possible fossil examples have been found in rocks that are around 3500 million years old, in Western Australia.

How does temperature affect the growth of bacteria?

Physical Factors that Control Microbial Growth. Generally,an increase in temperature will increase enzyme activity. But if temperatures get too high, enzyme activity will diminish and the protein (the enzyme) will denature. On the other hand, lowering temperature will decrease enzyme activity.

Does acidity affect the growth of bacteria in food?

Bacteria tend to prefer conditions that are near pH 7.0 but are capable of growing in a pH range of 4.6-7.0. There are many retail foods that fall within this range (Figure 11). Foods that are at a pH less than 4.6 will not support growth of disease-causing bacteria.

What are the 3 conditions needed for bacterial growth?

Each type of bacteria is adapted to certain environmental conditions. The three fundamental requirements related to bacterial life are temperature, oxygen and food.

How do antibiotics inhibit the growth of bacteria?

Often called bacteriostatic antibiotics, they prevent nutrients from reaching the bacteria, which stops them from dividing and multiplying. Because millions of bacteria are needed to continue the disease process, these antibiotics can stop the infection and give the body’s own immune system time to attack.

What are the environmental factors that affect the growth of bacteria?

So what environmental conditions can affect microbial growth? Temperature, oxygen, pH, water activity, pressure, radiation, lack of nutrients…these are the primary ones.

What are the four conditions for bacteria to grow?

What bacteria need to grow and multiplyFood (nutrients)Water (moisture)Proper temperature.Time.Air, no air, minimal air.Proper acidity (pH)Salt levels.

What factors affect the growth of bacteria in food?

Most foods contain sufficient nutrients to support microbial growth. Several factors encourage, prevent, or limit the growth of microorganisms in foods, the most important are aw, pH, and temperature. aw: (Water Activity or Water Availability).

What can inhibit bacterial growth?

A bisphenol called triclosan has been used in the manufacture of kitchen utensils like cutting boards to deter microbial growth. Halogens like iodine and chlorine have been used for centuries and are still used today to treat water (iodine tablets) and in the household disinfectant Clorox.

What are the six factors that affect the growth of bacteria?

Factor affecting bacterial growthNutrition concentration.Temperature.Gaseous concentration.pH.Ions and salt concentration.Available water.

What are the factors that affect growth?

10 Factors That Influence the Growth and Development of a ChildHeredity. Heredity is the transmission of physical characteristics from parents to children through their genes. … Environment. … Sex. … Exercise and Health. … Hormones. … Nutrition. … Familial Influence. … Geographical Influences.More items…•

Does bacteria need oxygen to grow?

Oxygen. … Whereas essentially all eukaryotic organisms require oxygen to thrive, many species of bacteria can grow under anaerobic conditions. Bacteria that require oxygen to grow are called obligate aerobic bacteria.

What are two ways of killing bacteria?

How to kill Bacteria?How to kill Bacteria? … The process of killing bacteria and other micro-organisms either in a vegetative or a spore state is known as sterilization. … Sterilization or bacterial killing is brought about by many methods, such as physical methods, irradiation and chemical agents or disinfectants.More items…•

Where do bacteria grow best?

Bacteria can live in hotter and colder temperatures than humans, but they do best in a warm, moist, protein-rich environment that is pH neutral or slightly acidic. There are exceptions, however. Some bacteria thrive in extreme heat or cold, while others can survive under highly acidic or extremely salty conditions.