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Sulfur Cycle

Sulfur Cycle. Rachel Franks, Rakin Hamad , and Elliot Beard. Sulfur. Sulfur is a brittle, yellow, tasteless and odorless nonmetallic element B ig part of vitamins, proteins and hormones Plays a big part in climate and the health of many ecosystems. Chemical Reactions.

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Sulfur Cycle

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  1. Sulfur Cycle Rachel Franks, Rakin Hamad, and Elliot Beard

  2. Sulfur • Sulfur is a brittle, yellow, tasteless and odorless nonmetallic element • Big part of vitamins, proteins and hormones • Plays a big part in climate and the health of many ecosystems

  3. Chemical Reactions • Mineralization of organic to inorganic sulfur • An example the degradation of cysteine -R-HS-CH2-CHNH2-CO2H (cysteine) -------> NH3 + R-HS-CH2-CO-CO2H (Beta-mercaptopyruvic acid)------> H2S + CH3-CO-C2H (pyruvic acid) ------> utilized in a number of ways for metabolism

  4. Chemical Reactions • Oxidation of sulfide and elemental sulfur • The main sulfur oxides are achieved by burning sulfur -S + O2 → SO2SO2 + 1/2 O2 → SO3

  5. Chemical Reactions • Reduction of sulfate to sulfide • Usually sulfate is converted to sulfide using this formula -SO42- + PAP (phosphoadenosine-5-phosphate)------> PAPS (phosphoadenosine-5-phosphosulfate------->PAPS + reduction------>PAPS-reductase------> Sulfite---->Thiosulphate---->Sulfide

  6. Chemical Reactions • Microbial immobilization of sulfur compounds and merging into organic sulfur • Usually sulfur is converted to protein using: -SO42 + PAP(phosphoadenosine-5-phosphate)------> PAPS(phosphoadenosine-5-phosphosulfate------->PAPS + reduction------>PAPS-reductase------> Sulfite---->Thiosulphate---->Sulfide---->a series of biochemical steps---->methionine----> sulfur containing protein.

  7. Inorganic • Sodium dithionite, Na2S2O4 • Thiosulfates (S2O32−) • Sulfites (SO32−) • Sulfides (S2−) • Sulfates (SO42−)

  8. Organic • Thiols • Thioethers • Sulfoxides • Sulfonium • Thiolates • Sulfones

  9. Pathway of Movement

  10. Pathway of Movement • Physical process like wind and erosion by water • Geological events like volcano eruptions • Biological activity • Chemical reactions

  11. Human Intervention • Burning of fossil fuels and processing of metals has increased the amount of Sulfur in the air and ocean • It also has used up the sedimentary rock sink

  12. Human Intervention • Create huge changes in the yearly flux of sulfur in the atmosphere • The increased Sulfur in the atmosphere has reacted with other pollutants and causes acid rain

  13. Work Cited • "Sulfur Cycle." The Environmental Literacy Council. Web. 22 Nov. 2010. <http://www.enviroliteracy.org/article.php/1348.html>. •  Corbin, Katie. "Biochemical Cycles." Environmental Microbiology. Virginia Polytechnic Institute and State University. Web. 19 Nov. 2010. <http://filebox.vt.edu/users/chagedor/biol_4684/Cycles/Scycle.html>.

  14. Work Cited •  "Sulfur Cycle." Water Treatment and Purification - Lenntech. Web. 22 Nov. 2010. <http://www.lenntech.com/sulphur-cycle.htm>. • "Environmental Decision Making, Science, and Technology." Mac OS X Server. Web. 22 Nov. 2010. <http://telstar.ote.cmu.edu/environ/m3/s4/cycleSulfur.shtml>.

  15. Questions • What color is sulfur? • Name an organic and inorganic sulfur compound? • How Human’s intervention in the sulfur cycle effected the climate?

  16. THE END

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