They often have-growth maxima of 65°C, while few can grow even at 100°C and higher temperatures. Disclaimer Copyright, Share Your Knowledge
Thermophiles are microorganisms that show growth optima at 55°C. Bacteria prefer a nice moderate temperature. Explain its significance. Buffers are salts of weak acids or bases that keep the pH of the medium constant. Our mission is to provide an online platform to help students to share notes in Biology. Microorganisms show variability in their ability to adapt the habitats of low water activity. Factors Affecting Growth of Bacteria. In most cases, the cell cytoplasm possesses higher solute concentration in comparison to its environment. The pH of a solution reveals whether the solution is acidic, alkaline or neutral. Microorganisms can be classified as acidophilus, neutrophils and basophiles (alkalophiles) on the basis of their requirement for particular pH in their environment. 1. (Another “think” question.) The real danger stems from certain bacteria called pathogens, which are the ones that cause food poisoning. 6. Microbial photosynthetic pigments (chlorophyll, bacteriochlorophyll, cytochromes and flavins), sometimes, absorb light energy, become excited or activated, and act as photosensitizers. Use the terms that describe a microbe’s growth range or requirement for each of the factors that influence microbial growth 2. What are antibiotics? The growth of microorganisms in the body, in nature, or in the … 1145 17th Street NW The lowest water activity limit for microbial growth of 0.60a w allows the growth of xerophilic yeasts.