Lecture 1_Historical Content

Lecture 1_Historical Content - PROKARYOTIC DIVERSITY BIOL...

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Unformatted text preview: PROKARYOTIC DIVERSITY BIOL 4125 SECTION 2 SPRING 2008 Brent Christner 282b Life Science Building (office) 225-578-1734 xner@lsu.edu; brent.xner.net/BIOL4125 GEMs; pharmaceutical/antibiotic production Biotechnology Ore mining; biofouling of petroleum Oxidation/reduction reactions Water quality Aquatic microbiology Energy production and bioremediation Microbial degradation Food and alcohol production Microbial fermentation Emerging pathogens/antibiotic resistance Infectious disease Animal husbandry; soil fertility; global warming Biogeochemical cycling Origin and evolution of life Genetic diversity of life Environmental/societal/scientific relevance Subtopic Why should we care about Why should we care about microbial diversity? microbial diversity? Geological timescale and major events in Earths history H o m o s a p i e n s H i g h e r p l a n t s a n d a n i m a l s O r i g i n o f l i f e O 2 a c c u m u l a t e s i n t h e a t m o s p h e r e E u k a r y o t e s a p p e a r i n f o s s i l r e c o r d ~3.9 billion years of microbial evolution ~90% of lifes history is microbial! History of the Earth as a single calendar year 31 December 11:59:59.86 PM 0.00002 Life of a student (20 years) 31 December 11:59:25 PM 0.005 Recorded history 31 December 11:55:16 PM 0.042 Neanderthal man 26 December 65 Dinosaurs extinct 7 November 680 Multicellular life 24 July 2,000 O 2 in the atmosphere 25 March 3,500 First fossils 1 March 3,800 Oldest rocks 1 January 4,550 Earth formed Calendar date Age (Ma) Event Nothing in biology makes sense except in the light of evolution. Theodosius Dobzhansky Biology, Molecular and Organismic , 1964 Determining microbial phylogeny is not simplythe extension of evolutionary study to all life on this planet. Rather than its providing the few missing pieces in the great puzzle of evolution, bacterial evolution in effect is the puzzle . Carl Woese Bacterial Evolution , 1987 http://tolweb.org/tree/ Haeckel's 3 kingdom phylogeny (1866): Plants, animals, and microorganisms Plants Animals Protists Fungi Monera The 5 kingdom classification scheme Most of the genetic diversity resides in the...
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Lecture 1_Historical Content - PROKARYOTIC DIVERSITY BIOL...

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