H
Helen F. Fredricks
Researcher at Woods Hole Oceanographic Institution
Publications - 42
Citations - 3507
Helen F. Fredricks is an academic researcher from Woods Hole Oceanographic Institution. The author has contributed to research in topics: Emiliania huxleyi & Coccolithovirus. The author has an hindex of 21, co-authored 41 publications receiving 3028 citations. Previous affiliations of Helen F. Fredricks include Rutgers University.
Papers
More filters
Journal ArticleDOI
Heterotrophic Archaea dominate sedimentary subsurface ecosystems off Peru
Jennifer F. Biddle,Julius S. Lipp,Mark A. Lever,Karen G. Lloyd,Ketil Bernt Sørensen,Rika E. Anderson,Rika E. Anderson,Helen F. Fredricks,Marcus Elvert,Timothy J. Kelly,Daniel P. Schrag,Mitchell L. Sogin,Jean E. Brenchley,Andreas P Teske,Christopher H. House,Kai-Uwe Hinrichs,Kai-Uwe Hinrichs +16 more
TL;DR: It is shown that extractable archaeal rRNA, selecting only for active community members in these ecosystems, is dominated by sequences of uncultivated Archaea affiliated with the Marine Benthic Group B and the Miscellaneous Crenarchaeotal Group, whereas known methanotrophic Archaea are not detectable.
Journal ArticleDOI
Phytoplankton in the ocean use non-phosphorus lipids in response to phosphorus scarcity.
Benjamin A. S. Van Mooy,Helen F. Fredricks,Byron E. Pedler,Byron E. Pedler,Sonya T. Dyhrman,David M. Karl,Michal Koblížek,Michal Koblížek,Michael W. Lomas,Tracy J. Mincer,Lisa R. Moore,Thierry Moutin,Michael S. Rappé,Eric A. Webb +13 more
TL;DR: It is shown that phytoplankton, in regions of oligotrophic ocean where phosphate is scarce, reduce their cellular phosphorus requirements by substituting non-phosphorus membrane lipids for phospholipids, suggesting that phospholIPid substitutions are fundamental biochemical mechanisms that allow phy toplankon to maintain growth in the face of phosphorus limitation.
Journal ArticleDOI
Sulfolipids dramatically decrease phosphorus demand by picocyanobacteria in oligotrophic marine environments.
TL;DR: Evolution of this "sulfur-for-phosphorus" strategy set the stage for the success of picocyanobacteria in oligotrophic environments and may have been a major event in Earth's early history when the relative availability of sulfate and PO4(3-) were significantly different from today's ocean.
Journal ArticleDOI
Viral Glycosphingolipids Induce Lytic Infection and Cell Death in Marine Phytoplankton
Assaf Vardi,Benjamin A. S. Van Mooy,Helen F. Fredricks,Kimberly J. Popendorf,Justin E. Ossolinski,Liti Haramaty,Kay D. Bidle +6 more
TL;DR: It is shown that viral glycosphingolipids regulate infection of Emiliania huxleyi, a cosmopolitan coccolithophore that plays a major role in the global carbon cycle.
Journal ArticleDOI
Host-virus dynamics and subcellular controls of cell fate in a natural coccolithophore population.
Assaf Vardi,Liti Haramaty,Benjamin A. S. Van Mooy,Helen F. Fredricks,Susan A. Kimmance,Aud Larsen,Kay D. Bidle +6 more
TL;DR: The results not only corroborate the critical role for glycosphingolipids and programmed cell death in regulating E. huxleyi–EhV interactions, but also elucidate promising molecular biomarkers and lipid-based proxies for phytoplankton host–virus interactions in natural systems.