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Quantifying archaeal community autotrophy in the mesopelagic ocean using natural radiocarbon.
An ammonia-oxidizing, carbon-fixing archaeon, Candidatus "Nitrosopumilus maritimus," recently was isolated from a salt-water aquarium, definitively confirming that chemoautotrophy exists among theExpand
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A major biopolymeric component to dissolved organic carbon in surface sea water
Organic carbon dissolved in sea water is an important component of the global carbon cycle1. Concentrations of dissolved organic carbon (DOC) in the ocean's surface mixed layer are at least twiceExpand
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Gas chromatographic isolation of individual compounds from complex matrices for radiocarbon dating.
This paper describes the application of a novel, practical approach for isolation of individual compounds from complex organic matrices for natural abundance radiocarbon measurement. This is achievedExpand
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Chemical characterization of high molecular weight dissolved organic matter in fresh and marine waters
Abstract The high molecular weight fraction of dissolved organic matter in a suite of lakes, rivers, seawater, and marine sediment interstitial water samples was collected by ultrafiltration andExpand
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Isotopic heterogeneity and cycling of organic nitrogen in the oligotrophic ocean
We measured the nitrogen (N) isotopic composition (d15N) of a large set (n 5 38) of high-molecular-weight (HMW) dissolved organic nitrogen (DON) samples isolated from the tropical and subtropicalExpand
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A comparison of the chemical characteristics of oceanic DOM and extracellular DOM produced by marine algae
The chemical characteristics of extracellular high molecular weight (HMW) dissolved organic matter (DOM) from 3 species of marine phytoplankton were compared to HMW DOM in seawater. ThalassiosiraExpand
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Bringing the ocean into the laboratory to probe the chemical complexity of sea spray aerosol
The production, size, and chemical composition of sea spray aerosol (SSA) particles strongly depend on seawater chemistry, which is controlled by physical, chemical, and biological processes. DespiteExpand
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Chemical composition and cycling of dissolved organic matter in the Mid-Atlantic Bight
Abstract This study focuses on the chemical characterization of high molecular-weight dissolved organic matter (HMW DOM) isolated from the Middle Atlantic Bight in April 1994 and March 1996. UsingExpand
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The radiocarbon signature of microorganisms in the mesopelagic ocean
Several lines of evidence indicate that microorganisms in the meso- and bathypelagic ocean are metabolically active and respiring carbon. In addition, growing evidence suggests that archaea areExpand
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Radiocarbon analysis of neutral sugars in high-molecular-weight dissolved organic carbon: Implications for organic carbon cycling
We used compound-specific natural-abundance radiocarbon analyses of neutral sugars to study carbon cycling of high-molecular-weight (HMW) dissolved organic carbon (DOC) at two sites in the NorthExpand
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