John K. Freytag, Ph.D.

Pennsylvania State University, State College, PA, United States 
Autotrophic symbioses, Hydrothermal Vents, Methane Seeps
"John Freytag"


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Charles R. Fisher grad student 2003 Penn State
 (Ecological physiology and biochemistry of sulfide acquisition by two hydrocarbon seep vestimentiferans, Lamellibrachia luymesi and Seepiophila jonesi.)
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Flores JF, Fisher CR, Carney SL, et al. (2005) Sulfide binding is mediated by zinc ions discovered in the crystal structure of a hydrothermal vent tubeworm hemoglobin. Proceedings of the National Academy of Sciences of the United States of America. 102: 2713-8
Girguis PR, Childress JJ, Freytag JK, et al. (2002) Effects of metabolite uptake on proton-equivalent elimination by two species of deep-sea vestimentiferan tubeworm, Riftia pachyptila and Lamellibrachia cf luymesi: proton elimination is a necessary adaptation to sulfide-oxidizing chemoautotrophic symbionts. The Journal of Experimental Biology. 205: 3055-66
Freytag JK, Girguis PR, Bergquist DC, et al. (2001) A paradox resolved: sulfide acquisition by roots of seep tubeworms sustains net chemoautotrophy. Proceedings of the National Academy of Sciences of the United States of America. 98: 13408-13
Fisher C, Freytag J, Flores J, et al. (2000) Extreme adaptations for life with sulfide Comparative Biochemistry and Physiology Part B: Biochemistry and Molecular Biology. 126: S35
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