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Metagenomic studies characterize both the composition and diversity of uncultured viral and microbial communities. BLAST-based comparisons have typically been used for such analyses; however, sampling biases, high percentages of unknown sequences, and the use of arbitrary thresholds to find significant similarities can decrease the accuracy and validity of(More)
  • Nianzhi Jiao, Gerhard J Herndl, Dennis A Hansell, Ronald Benner, Gerhard Kattner, Steven W Wilhelm +5 others
  • 2010
The biological pump is a process whereby CO(2) in the upper ocean is fixed by primary producers and transported to the deep ocean as sinking biogenic particles or as dissolved organic matter. The fate of most of this exported material is remineralization to CO(2), which accumulates in deep waters until it is eventually ventilated again at the sea surface.(More)
  • David L Kirchman, Benedikt Meon, Hugh W Ducklow, Craig A Carlson, Dennis A Hansell, Grieg F Steward +1 other
  • 2001
We hypothesized that dissolved carbohydrates would be large components of the labile dissolved organic carbon (DOC) pool and would support much bacterial growth in Antarctic waters, especially the Ross Sea, since previous work had observed extensive phytoplankton blooms with potentially high production rates of carbohydrates in Antarctic seas. These(More)
To appreciate differences in benthic bacterial community composition at the relatively pristine Tuvem and the anthropogenically-influenced Divar mangrove ecosystems in Goa, India, parallel tag sequencing of the V6 region of 16S rDNA was carried out. We hypothesize that availability of extraneously-derived anthropogenic substrates could act as a stimulatant(More)
There is now evidence that aerobic anoxygenic phototrophic (AAP) bacteria are widespread across aquatic systems, yet the factors that determine their abundance and activity are still not well understood, particularly in freshwaters. Here we describe the patterns in AAP abundance, cell size and pigment content across wide environmental gradients in 43(More)
Consideration of the trophic interactions that link species requires study of the decomposition process to reveal different pathways for nutrient regeneration, elemental recycling, and microbial production in the water column. In this study, the presence and activity of Gammaproteobacteria, Alphaproteobacteria and Sphingo-Flavobacteria were assessed during(More)
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