title: Dense populations of a giant sulfur bacterium in Namibian shelf sediments.
abstract: A previously unknown giant sulfur bacterium is abundant in sediments underlying the oxygen minimum zone of the Benguela Current upwelling system. The bacterium has a spherical cell that exceeds by up to 100-fold the biovolume of the largest known prokaryotes. On the basis of 16S ribosomal DNA sequence data, these bacteria are closely related to the marine filamentous sulfur bacteria Thioploca, abundant in the upwelling area off Chile and Peru. Similar to Thioploca, the giant bacteria oxidize sulfide with nitrate that is accumulated to </=800 millimolar in a central vacuole.
authors: Max Planck Institute for Marine Microbiology, Celsiusstrasse, D-28359 Bremen, Germany. hschulz@mpi-bremen.de
authors: H N
authors: HN
authors: Schulz
authors: T
authors: T
authors: Brinkhoff
authors: T G
authors: TG
authors: Ferdelman
authors: M H
authors: MH
authors: Mariné
authors: A
authors: A
authors: Teske
authors: B B
authors: BB
authors: Jorgensen
mesh_terms: D001419:Bacteria / Q000145:classification / Q000166:cytology / Q000302:isolation & purification* / Q000378:metabolism*; D003593:Cytoplasm / Q000648:ultrastructure; D020459:Genes, rRNA; D019015:Geologic Sediments / Q000382:microbiology*; D008854:Microscopy, Electron; D008969:Molecular Sequence Data; D009276:Namibia; D009566:Nitrates / Q000032:analysis / Q000378:metabolism*; D010084:Oxidation-Reduction; D010802:Phylogeny; D012329:RNA, Bacterial / Q000235:genetics; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D013440:Sulfides / Q000378:metabolism*; D013455:Sulfur / Q000032:analysis* / Q000378:metabolism; D009626:Terminology as Topic; D014617:Vacuoles / Q000737:chemistry / Q000648:ultrastructure
chemical_list: D009566:Nitrates; D012329:RNA, Bacterial; D012336:RNA, Ribosomal, 16S; D013440:Sulfides; D013455:Sulfur