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Micro Lect 3

by: Madi Burke

Micro Lect 3 BIOL 2051

Madi Burke

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About this Document

Lecture notes from week 3 of class, finishes notes on material covered on Exam 1
Prof. Brininstool
Class Notes
Biology, Microbiology, Science
25 ?




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This 2 page Class Notes was uploaded by Madi Burke on Friday September 9, 2016. The Class Notes belongs to BIOL 2051 at Louisiana State University taught by Prof. Brininstool in Fall 2016. Since its upload, it has received 2 views. For similar materials see Microbiology in Biological Sciences at Louisiana State University.

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Date Created: 09/09/16
Micro Notes: Wednesday, September 7, 2016 Gas Vesicles ~ made of protein ~ buoyancy ~ gas-filled ~ used by aquatic organisms (ex: cyanobacteria) ~ want to go to the surface for better lighting, but UV exposure = mutation (want moderation) Magnetosomes ~ magnetite (Fe3O4) ~ used by aquatic organisms (ex: Magnetospirillum) ~ orientation OTHER: Carboxysome *refer to chloroplast* ~ found in (some) prokaryotes (ex: Halothiobacillus neopolianus) ~ contains RuBisCo Cell Inclusion Bodies ~ Carbon (glycogen, poly-B-hydroxyalkanoate) ~ Sulfur (gransules in periplasm) {ex: purple sulfur bacteria (Gram negative)} ~ Phosphate (granules) History: Ferdinand Cohn (1876) ~ Bacillus subtilis ~ discovered endospores ~ described cycle as vegetative cell -> endospore -> vegetative cell Endospore Formation (aka sporulation) ~ survival mechanism ~ gram positive only? ~ cell growth has stopped when spore forms ~ within vegetative cell & @ its own expense (likely takes a lot of energy, etc.) Ex: Metabacterium polyspora (can form multiple spores) Endospore Locations: (inside of the cells) ~ terminal (ex: Clostridium botulinum) ~ subterminal (ex: Bacillus subtilis) ~ central (ex: Bacillus anthracis) Endospore: ~ dormant ~ used for survival ~ essential molecules contained within ~ calcium dipicolinic acid + (small) proteins (acid-soluble) (not present in vegetative cells…) ~ dehydrated Layers: ~ coat ~ cortex ~ exosporium ~ core wall ~ core ~ DNA Spore: ~ released from cell ~ basically immortal ~ heat/chemical/radiation/desiccation - resistant {See “Can Endospores Live Forever?”} Germination: ~ under favorable conditions ~ spore transforms into a vegetative cell that is (genetically) identical to the cell that made it (see fig. 3.37 for cycle visual) END OF EXAM 1 CONTENT


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