BLG 151 Lecture Notes - Lecture 7: Ecological Niche, Hyperthermophile, Psychrophile
26 Dec 2019
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Chapter 5: environmental influences and control of microbial grown. The normal growth conditions are: sea level, temp 20-40 , a near-neutral ph, 0. 9 % salt, ample nutrients. Any ecological niche outside this widow is called extreme . Organisms inhabiting extreme niche is called an extremophile (bacteria, archaea, eukaryotes) Earliest microbes likely grew in extreme environments. Each organism has a optimum temp and min and max temp that defines growth limits. Microbes that grow at higher temps can achieve higher rates of growth. All of these organisms have membranes and proteins best suited for their temperature: microbes need to stabilize their membrane + proteins that are suited for the environment, ex. Proteins of thermophiles have more hydrogen bonds making the protein structure rigid to withstand temperature, they also have less glycine in proteins. They have histone like proteins which stabilize their dna .
