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6. What is the deference between thermoduric bacteria and thermophiles?

charlesrpritchard — 2024-02-13 22:50:55 UTC

Thermophilic : Bacteria those thrive at 50-110 C growing conditions and this needs for their optimum growth.

Thermoduric : those bacteria which withstand higher temperatures that actually not suitable for their optimal growth.

How temperature affects bacterial growth

improvementnotice — 2024-02-13 22:51:27 UTC

Why temperature has a significant effect on living organisms
Define minimum, optimum and maximum growth temperature
What is the temperature range for psychrophiles, Psychrotrophs, Mesophiles, Thermophiles, Hyperthermophiles
Give an example for each group

Which one of the above groups is most likely to cause food spoilage
What is the deference between thermoduric bacteria and thermophiles

•Class discussion/feedback

4 Examples of each group

kerstendj — 2024-02-13 22:55:36 UTC

Psychrophiles = Listeria, E.coli (raw milk, Enviromental)

Psychrotrophs = Enterobacter kobei (raw milk)

Mesophiles = Clostridium, Staphylococcus, E.coli

Thermophiles = Bacillus, Micrococcus, Streptococcus, Lactobacillus, and Clostridium (Driers)

Hyperthermophiles = Methanopyrus (driers)

2. Define minimum, optimum and maximum growth temperature

improvementnotice — 2024-02-13 22:58:01 UTC

Minimum Growth Temperature: The lowest temperature at which a bacterial species can still carry out basic metabolic functions and reproduce, although at a very slow rate.

Optimum Growth Temperature: The temperature at which a bacterial species experiences the highest growth rate and is most metabolically active.

Maximum Growth Temperature: The highest temperature at which a bacterial species can still grow and reproduce, but beyond which its metabolic and enzymatic activities are compromised.

Different bacterial species have different temperature preferences, leading to the classification of bacteria into temperature categories.

3. Temperature Range

charlesrpritchard — 2024-02-13 22:59:20 UTC

Psychrophiles: 20 °C for maximal growth, 15 °C or lower for optimal growth, and 0 °C or lower for minimum growth

Psychrotrophs: are organisms can grow below 10 °C and down to about −1 °C, but usually prefer to grow at about 21 °C

Thermophiles: live at temperatures between 60 and 80 ° C

Mesophiles: grow and thrive in a moderate temperature range between 20°C and 45°C.

Hyperthermophiles grow optimally at temperatures between 80 and 110°C.

Reference article: Psychrophilic Bacteria - an overview | ScienceDirect Topics

1. Why temperature has a significant effect on living organisms?

improvementnotice — 2024-02-13 23:03:21 UTC

Temperature impacts microbial growth. Most microbes grow optimally within a certain temperature range dictated by the ability of proteins within the cell to function. In general, at low temperatures, microbes grow slower. At higher temperatures, microbes grow more quickly.

5 Organisms most likely to cause food spoilage

georgewynyard — 2024-02-13 23:57:14 UTC

Psychrotrophs are the organisms most likely to cause food spoilage in the dairy industry. This is because they can thrive at the low temperatures in which dairy products are stored, and also contain some heat-resistant strain able to survive pasteurisation.

They can grow at temperatures below 10 °C and down to about −1 °C, although they usually prefer to grow at about 21 °C.
There are many psychrotrophs, but the most important one is Pseudomonas, as 90% of psychrotrophs isolated from cold stored food belongs to this genus.