MICR 2420 Lecture Notes - Lecture 23: Streptomycin, Cell Membrane, Symbiosis
Document Summary
Lecture 23 undergo mutation and cause antibiotic resistance. Narrow spectrum antibiotic is for specific families of bacteria whereas a broad spectrum of antibiotics that deals with gram positive and negative bacteria. So its resistance can be caused by mutation in one of the ribosomal proteins or rrna molecules. Penicillin is beta lactams and are very different from vancomycin because the have different mechanisms of action. Bacteriostatic antibiotics means the cell isn"t killed right away so the cells could. Quorum sensing is a mechanism of bacterial cells to turn on or off various traits at key cell density. Biofilms have high density so its better for cells to move on instead of competing against the biofilm. Vibrio fisheri: it"s a symbiont from a squid and it was discovered a long time. The the bottom of the ocean they won"t cause a shadow and their prey won"t see them. The lux (paradigm system): is a light measurement: