Shewanella putrefaciens

Introduction

Shewanella putrefaciens is a bacteria that is found mainly in marine environments. It is a gram negative bacteria, meaning it does not dye during gram staining, which usually indicates a stronger antibiotic resistance. It is also a facultative anaerobe, meaning it can undergo aerobic respiration when oxygen is present, and can reduce iron and magnesium metabolically. Because of this Shewanella putrefaciens can reduce Uranium and create uranium deposits. Sheweanella putrefaciens grows quickly on both solid and liquid media and is recognizable for its pink color. Shewanella putrefaciens was first isolated from dairy products in 1931 by Derby and Hammer. It is classified as an Achromobacter and later named by MacDonell and Colwell in 1985.

Scanning electomicrograph image of Shewanella Putrefaciens CN32 cells taken by the Department of Energy.

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Effect on Marine Life

Shewanella putrefaciens can be found in freshwater, brackish, and salt water ecosystems. Many healthy marines animals are contaminated with Shewanella putrefaciens only to have it be realized when food caught by seafood industries spoils due to the bacterias presence. In freshwater animals, and in particular fish species of trout, the bacteria has been shown to cause disease. The effect of the bacteria is seen through external lesions and visible bacterial colonies. Fatality from Shewanella Putrefaciens usually only occurs if the fish are already in poor health, under environmental stress or a whole body inner infection occurs that impedes organ function.

Effect on Humans

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Conclusion

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References

[Sample reference] Takai, K., Sugai, A., Itoh, T., and Horikoshi, K. "Palaeococcus ferrophilus gen. nov., sp. nov., a barophilic, hyperthermophilic archaeon from a deep-sea hydrothermal vent chimney". International Journal of Systematic and Evolutionary Microbiology. 2000. Volume 50. p. 489-500.

Edited by [Author Name], student of Joan Slonczewski for BIOL 116 Information in Living Systems, 2013, Kenyon College.