MIC 102 Lecture Notes - Lecture 15: Nitrogenase, Cyanobacteria, Repressor
11 Nov 2017
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Document Summary
Cell to cell communication is not uncommon among unicellular prokaryotes. Many methods available: homoserine lactones in g, specific peptides in g+ Quorum sensing: cells wait to take some action. Low levels of ahl production do not do anything. At high levels, ahl binds to luxr luxr-ahl promotes transcription of lux operon turns on luciferase production -> lights up increases production of luxl. Differentiation is an adaptive response of cells to their environment takes many forms in bacteria reversible vs terminal differentiation. Biofilm formation in the wild vs in the lab. Many domesticated lab strains lose the capacity to form biofilms. Can affect the function of other development processes. Dormant cell type that resists more extreme environment stresses. Compare vs exospores: formation, purpose: survive and disperse. Germination upon nutrient availability to become vegetative cells again. Entry into sporulation is stimulated by nutrient limitation: limited nutrients, but enough to sporulate with.
