Winogradsky2009

Winogradsky2009 - Sergei Winogradsky Russian microbiologist...

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Unformatted text preview: Sergei Winogradsky Russian microbiologist (1856-1953) Interested in nitrogen and sulfur cycling Studied colorless sulfur oxidizing bacteria H 2 S --> S o--> H 2 SO 4 First proposed the concept of chemolithoautotrophy- energy from the oxidation of inorganic compounds Isolated first nitrogen-fixing bacterium Winogradsky column : self contained ecosystem for studying microbial ecology and for enrichment of bacteria with diverse types of metabolism Oxic and anoxic environments Oxygenic phototrophs replenish oxygen; aerobic respiration consumes oxygen forming a gradient from top to bottom Full carbon, nitrogen, and sulfur cycles ongoing VH vineyard Treated with sulfur Construction of a Winogradsky column Cellulose Cellulose Cellulose o (SRB) Cellulose Cellulose (Purple sulfur bacteria) (Green sulfur bacteria) Anoxygenic photoauto- trophs Cellulose Cellulose (PNS * ) Anoxygenic photoheterotrophs * Sensitive to H 2 S; may be low abundance or absent in our columns Cellulose (sulfide oxidizing autotroph) Cellulose Cyanobacteria and algae oxygenic photoautotrophs Cellulose Aerobic heterotrophic bacteria Eukaryotic microbes Aerobic sulfur oxidizers Thiobacillus Fermentable organic...
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Winogradsky2009 - Sergei Winogradsky Russian microbiologist...

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