Exploring the distribution and physiological roles of bacterial membrane lipids in the marine environment
Saenz, James P.
MetadataShow full item record
LocationWaquoit Bay, Cape Cod, MA
Lipids have a legacy in the geologic record extending back to the Archaean. Since the phylogenetic diversity of life is reflected in the structural diversity of biomolecules, lipid biomarkers that are shown to be diagnostic of certain organisms that carry out specific biochemical processes or that are demonstrated to have unique physiological roles can be used to trace the biogeochemical influence of bacteria in modern and ancient environments. In this thesis I explore the application of two classes of bacterial membrane lipids as biomarkers for marine biogeochemical processes in marine environments: ladderanes and hopanoids. Through the detection of ladderane lipids – biomarkers for anaerobic ammonium oxidizing (anammox) bacteria – I demonstrate the presence and distribution of anammox bacteria in a subterranean estuary. Through a survey of hopanoids in marine environments and cultured marine cyanobacteria I show that hopanoids are ubiquitous in the oceans and that their presence in ancient marine sediments could provide information about biogeochemical processes in past environments. Based on novel results demonstrating that hopanoids are resistant to extraction by non-ionic detergent, I propose that they may play a role in lipid ordering and the formation of putative lipid rafts in hopanoid-producing bacteria.
Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution June 2010
Suggested CitationThesis: Saenz, James P., "Exploring the distribution and physiological roles of bacterial membrane lipids in the marine environment", 2010-06, DOI:10.1575/1912/4081, https://hdl.handle.net/1912/4081
Showing items related by title, author, creator and subject.
Marine sedimentary organic matter : delineation of marine and terrestrial sources through radiocarbon dating; and the role of organic sulfur in early petroleum generation Benitez-Nelson, Bryan C. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1996-05)This thesis details two years of research conducted with the guidance and support of three advisors: Dr. J. K. Whelan, Dr. J. S. Seewald and Dr. T. I. Eglinton. Each of the three chapters represents a different, ...
Dynamic energy budgets and bioaccumulation : a model for marine mammals and marine mammal populations Klanjscek, Tin (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2006-06)Energy intake of individuals affects growth of organisms and, therefore, populations. Persistent lipophilic toxicants acquired with the energy can bioaccumulate and harm individuals. Marine mammals are particularly ...
Developing a national marine electronics agenda : proceedings of the Marine Instrumentation Panel meeting, September 12-14, 1989 Gaines, Arthur G.; Lindborg, Kristina L. C. (Woods Hole Oceanographic Institution, 1990-12)Thirteen short papers address aspects of competitiveness in the marine electronics instrumentation industry. Topics include activity and status of government initiatives in Japan and Europe to promote this industry; and ...