OEB 119 11-13.docx

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Department
Organismic and Evolutionary Biology
Course
Organismic and Evolutionary Biology OEB 119
Professor
Peter Girguis
Semester
Fall

Description
03/14/2014 Microbes are an unseen majority in the ocean Deep ocean hosts a massive microbial community: water, sediments, crustal aquifer ~10^28 microbes in the ocean system 10^22 meters ~ 2 million light years Gliese 581 g is ~20 light years away Would fill 10 million Harvard biolabs A petagram (~10^15 g) of Carbon in marine microbes Roles in biogeochemical cycles remain poorly constrained – major influence on carbon, nitrogen, oxygen,  sulfur and metal cycles Why do we know so little about microbes? Sequencing: a watershed for phylogeny “­omics” 22,000 microbial genomes completed  99.99% of microbes have eluded cultivation. Cultivars rarely studied at in situ conditions, lab evolved Measuring microbial metabolic activity has been a slow process. Discrete samples are used for rates, often  difficult or impractical to collect “Impedance mismatch” 2­30% of life on the planet is microbial – 10^27 is WAY WAY differe
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