BIOL 2300 Lecture Notes - Lecture 3: Archaea, Acidophile, Food Spoilage
Document Summary
Chapter 4: microbial growth: photoautotroph:sunlight, photoheterotroph: sunlight, chemolithoautotroph: inorganic, chemoorganoheterotroph: organic. Nutritional factors: required elements: c, o, h, n, s, k, magnesium, calcium, iron, organisms based on carbon use: Autotrophs: inorganic carbon (co2: trace elements: small amounts the organism needs. Growth factors: some cannot synthesize cell constituents. The elements have to be added to the organism: can display wide variety of factor requirements. Component of amino acid, lipids, nucleic acids, and sugars. Component of nucleic acids, membrane lipids, and atp. Potassium, magnesium, and calcium required for the function of certain enzymes. Bacterial growth in lab: closed batch system: no input of nutrients. Population grows in a predictable, steady growth o. Log or exponential phase: huge growth of the organism. Cells compete for resources: they grow exponentially and then compete for nutrients. Position in the colony determine the resource availability: on the edge: have little competition/ high oxygen stores, in the middle: high population density.