MICRB265 Lecture Notes - Lecture 13: Magnetospirillum, Motility, Greigite
4 Nov 2017
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Document Summary
Some gram positive bacteria form endospores in order to survive poor growth conditions, such as lack of essential nutrients. Resistant to abiotic stress, uv radiation and chemical stress. Form spores only when nutrient deficiency such as carbon and nitrogen. Core core wall, cm, cytoplasm, nucleoid, ribosomes, dipicolinic acid + ca 2+ Small acid-soluble spore proteins will bind and protect dna. Dipicolinic acid is unique to bacterial spores. it dehydrates the spore which increases the heat resistance of the macromolecules. Makes up 10% dry weight of endospores. High in calcium 2+ concentration; crosslinks dpa molecules, and binds free water. Inserts between dna bases. some spores can survive up to 150 degrees, most killed at 121 degrees. Rapid process; synthesis of rna, protein. dna breaks and discards spore coat. Free endospore activation outgrowth vegetative cell. Cell inclusions are storage bodies used for energy reserves or reservoirs of carbon, phosphate, sulfur, carbonate, magnets or other things. scarce carbon in the environment.
