BIOL-M 250 Lecture Notes - Lecture 7: Atacama Desert, Superoxide, Red Color
Document Summary
Rela is a protein that binds to ribosome & detects pausing. Synthesizes alarmone: ppgpp which signals for starvation phase changes in physiology *ppgpp is single modified nucleotide. What is the difference between growth rate and growth yield? yield: max amount of cells accumulated, proportional to nutrient concentration growth rate: proportional to nutrient concentration when nutrients are low, otherwise constant: lecture 14 : extremophiles. Growth is optimal at unique curve for each bacterium: growth is arrested at extremes. Different microbes have evolved to grow best under specific conditions- niche theory. Some are generalists: grow under broad range of conditions, flexible. Some have evolved to be fast growers: nutrient rich eutrophic environments. Some have evolved to be slow growers: nutrient poor oligotrophic conditions. Temperature: (range of temperature optima) ix: temperature can be limited by raising or lowering temperature: Heat: raise temperature by cooking or pasteurization, or lower temperature by refrigeration: ex) thermophile: 50-80-degree c.
