April15_HJS

April15_HJS - Prions Proteinaceous infectious agent Linked...

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Proteinaceous infectious agent Linked to a number of fatal human diseases Prions > Brain degeneration: Brain tissue develops sponge-like holes
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Disease termed transmissible spongiform encephalopathies > Symptoms may not appear for years after infection.
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- Disease is associated with misfolding of a normal protein (due to mutation)
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- Altered protein is resistant to proteases (normal is sensitive), UV light and nucleases; - Inactivated by chemicals that denature proteins.
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Consist solely of small ss RNA molecule Viroids Group of pathogens that are much smaller and distinctly different from viruses. Vary in size Have no protein coat - Viroid RNA is circular and resistant to nuclease digestion
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All identified viroids infect plants Diseases include Potato spindle tuber Chrysanthemum stunt Cadang-cadang
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Microbial Ecology Study of the relationships of microorganisms to each other and to their environment.
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-Role for an organism in a particular ecosystem is its ecological niche . -Each ecosystem (ocean, river, forest, desert…) possesses a certain spectrum of organisms and characteristic physical conditions. - Communities of bacteria interact with each other and the non- living environment, forming an ecosystem .
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1 0 Producers : -Autotrophs (photo and chemo); serve as a food source for consumers and decomposers. Consumers
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This note was uploaded on 05/19/2008 for the course BIOL 275 taught by Professor Sandoz/shreirer during the Spring '08 term at UMBC.

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April15_HJS - Prions Proteinaceous infectious agent Linked...

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