BMS1021 Lecture Notes - Large Intestine, Antibody, Immune System
8 Jul 2013
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Each species has two-part name: first part is genus and second part is species. Escherichia coli genus = escherichia, species = coli: six kingdoms and two domains: Archaea (or archaebacteria): diverse group of organisms that often live under extreme environmental conditions e. g. high salt/temperature. Structure of nucleus: prokaryotic nuclear material not surrounded by membrane. Selective toxicity: choose an antimicrobial agent whose mechanism of action targets a biochemical process that only occurs in bacteria, inhibit that process. No effect on mammalian cell because it does not carry out that process. Peptidoglycan is an essential structural component of bacterial cell wall. Bacteria vary in size : 0. 1micrometers to 50micrometers in diameter. Crystal violet iodine complex trapped inside cell. Basis for gram stain technique: differences in thickness of peptidoglycan layer. Bacteria have external structures like: flagella, pili or fimbriae, and capsules. Not all bacteria have flagella and therefore some are not motile. Not involved in motility, and not in all bacteria.
