BIOG 1440 Lecture Notes - Lecture 9: Malabsorption, Human Microbiota, Small Intestinal Bacterial Overgrowth
3 Mar 2018
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Document Summary
Eukaryotic cell could arise from symbiotic union of primitive prokaryotic cells: symbiogenesis: mitochondria and chloroplasts evolved from certain bacteria engulfed by primitive cells. Primitive cell engulfs proteobacterium ( mitochondria) and a cyanobacterium ( chloroplast: microbiota: ecological community of microorganisms associated w/ host, ex: skin microbiota, gut microbiota is not endosymbiotic--gut lumen is outside of body. But, this community is tightly associated w/ host--will still influence physiology: (gut lumen is an outside, not so open) Bacteria in the rhizosphere: bacteria in rhizosphere. Tic on dog: plants and soil microbes have mutualistic relationship, most interactions occur in rhizosphere--surroundings of root system, two types of microbes found, rhizobacteria that occupy rhizosphere (rhisospheric). Stay on surface of root: rhizobacteria that are endophytic. Flavonoids trigger nod factors production(change morphology of root system). Nod factors alter root cell activity--rhizobia enters cells, enlarges cells enlarged cells form nodule. See the picture on the slide to try and understand this.
