BIOL-M 200 1st Edition Lecture 6 Outline of Last Lecture I. Metabolism= catabolism + anabolism A. Metabolic classes include: energy source, electron source, carbon source.II. Exponential GrowthA. Cells double at the same rateIII. Generation TimeA. Time required for cell population to doubleOutline of Current Lecture II. Conditions that influence bacterial growth.A. Temperature, Osmolarity, Oxygen, AcidityCurrent LectureI. TemperatureA. 37 degrees Celsius – most important temperaturea. Mesophiles B. Range of Temperature optima C. Thermophiles (some bacteria) and Hyperthermophiles (some archaea)a. Survive by “Thermostable”- proteins that stay folded at high temperature.D. Psychrophilesa. metabolism optimized for low temperatureE. Osmolaritya. Halotolerance- Defined as the amount of salt that is tolerated. I. Halophiles- ponds with very high salt concentration.F. Oxygena. Oxygen in the air is extremely toxic to some microorganisms. b. Microorganism generates oxygen radicals.c. Microorganisms have different oxygen tolerancesThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.d. Oxygen protection: I. Superoxide Dismutase (enzyme that detoxifies radicals)II. Catalase (enzyme that converts hydrogen peroxide to water)G. Aciditya. Lower the number, more acidic. Higher the number, more basic. II. Microbial growth in the real worldA. BIOFILM: association of microorganisms attached to a surface.B. Cells use proteins, and polysaccharides (capsule) to adhere to one another and to surfaces.C. Facilitates communication, acquisition of nutrients, resistance to chemicals and environmental