Samanthi Udayangani holds a B. Degree in Plant Science, M. Your email address will not be published. Figure Mesophilic E coli. Leave a Reply Cancel reply Your email address will not be published. Mesophiles vs Thermophiles. Mesophiles are microorganisms that live in moderate temperatures. Thermophiles are microorganisms that live and thrive at relatively high temperatures.
Temperature Range. Mesophiles have a temperature range of 20 0 C to 45 0 C. Thermophiles have a temperature range of 45 0 C to 80 0 C. Living Environment. Mesophiles live in cheese, yogurt, beer, wine, human intestine, etc. Thermophiles live in soil exposed to direct sunlight, volcanic environments, deep-sea thermal vents, hot springs, etc.
Optimum Temperature. The optimum temperature of mesophiles is 37 0 C. The optimum temperature of thermophiles is 50 0 C. Thermophilic bacteria have a variety of applications such as the production of heat-stable DNA polymerases used in PCR. Hence, bacteria in the human microbiome, as well as human pathogenic bacteria, are mesophiles. Some examples of mesophilic bacteria are Listeria monocytogenes, Streptococcus pyrogenes , Staphylococcus aureus , etc.
Figure 2: Staphylococcus aureus. The thermophilic bacteria refer to a type of extremophiles that thrives at relatively high temperatures while the mesophilic bacteria refer to a bacteria that grow best in moderate temperatures. A sudden temperature drop can result in the inhibition of the methane producing bacteria methanogens. Consequently, temperature control for the anaerobic digestion process is considered as one of the main design parameters.
Heat requirements to either the inflowing feed or to the digestion vessel are usually fulfilled on-site from the conversion of biogas to heat directly or via the recovered heat in a CHP unit. Digestion vessels should also be insulated since ambient temperature changes can also affect digestion performance.
Temperature and Microbial Growth. Growth Rate and Temperature Bacteria may grow across a wide range of temperatures, from very cold to very hot. Learning Objectives Describe how the growth of bacteria is affected by temperature and how bacterial growth can be measured. Key Takeaways Key Points The basic means of measuring growth requires bacterial enumeration cell counting.
Methods for bacterial cell counting include: 1. Cold shock proteins help the cell to survive in temperatures lower than optimum growth temperature. Heat shock proteins help the cell to survive in temperatures greater than the optimum, possibly by condensation of the chromosome and organization of the prokaryotic nucleoid.
Key Terms mesophile : An organism, especially a microorganism, that lives and thrives at moderate temperatures. Classification of Microorganisms by Growth Temperature Bacteria can be classified on the basis of cell structure, metabolism or on differences in cell components. Learning Objectives Describe how bacteria can be classified on the basis of cell structure, cellular metabolism or differences in cell components such as DNA.
Thermophiles contain enzymes that can function at high temperatures. Learning Objectives Describe how the bacterial stress response enables bacteria to survive adverse and fluctuating conditions in their immediate surroundings such as increases in temperature. Key Takeaways Key Points The bacterial stress response enables bacteria to survive adverse and fluctuating conditions in their immediate surroundings.
A bacterial cell can react simultaneously to a wide variety of stresses and the various stress response systems interact with each other by a complex of global regulatory networks. Key Terms heat shock response : The cellular response to heat shock. Licenses and Attributions.
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