BIOL240 Lecture Notes - Lecture 18: Intracellular Ph, Water Activity, Osmotic Pressure
15 Mar 2019
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Document Summary
Water loss prevented by increasing internal solute concentration. Everything below 0. 9 here are not bacteria: pumping in inorganic ions from environment halobacterium with k, synthesis/concentration of organic solutes like sucrose and glycerol. Temperature: can affect macromolecular structure, membrane fluidity and enzyme function; different microbes have different temperature growth ranges. Chlamydomonas nivalis psychrophile (red and green snow) because of chlorophyll and carotenoids respectively giving green and red colors. As they absorb more light, they increase the heat in the surroundings making pits of red snow. The optimum point is the red line max production. After it can denature proteins, cytoplasmic membrane will collapse thermal lysis (blowing an engine). That"s why we keep stuff in the fridge, so the cold temperature is hard for the organisms to work as their membranes are gelled, not allowing stuff to pass into and out of the cell. Psychrophile: 0 20c with opt. temp.
