scholarly journals Biogeochemical cycling of nitrogen in lakes and the role of microorganisms in conversion of nitrogen compounds

2007 ◽  
Vol 19 (4) ◽  
pp. 382-389 ◽  
Author(s):  
ZENG Jin ◽  
◽  
YANG Liuyan ◽  
XIAO Lin ◽  
YIN Daqiang ◽  
...  
Keyword(s):  
Biogeochemical Cycling ◽  
Nitrogen Compounds

scholarly journals Petrobactin, a siderophore produced by Alteromonas, mediates community iron acquisition in the global ocean

2021 ◽  
Author(s):  
Lauren E. Manck ◽  
Jiwoon Park ◽  
Benjamin J. Tully ◽  
Alfonso M. Poire ◽  
Randelle M. Bundy ◽  
...  
Keyword(s):  
Biosynthetic Pathway ◽  
Iron Acquisition ◽  
Biogeochemical Cycling ◽  
Iron Bioavailability ◽  
Siderophore Production ◽  
Global Ocean ◽  
The North ◽  
The North Pacific ◽  
Alteromonas Macleodii

AbstractIt is now widely accepted that siderophores play a role in marine iron biogeochemical cycling. However, the mechanisms by which siderophores affect the availability of iron from specific sources and the resulting significance of these processes on iron biogeochemical cycling as a whole have remained largely untested. In this study, we develop a model system for testing the effects of siderophore production on iron bioavailability using the marine copiotroph Alteromonas macleodii ATCC 27126. Through the generation of the knockout cell line ΔasbB::kmr, which lacks siderophore biosynthetic capabilities, we demonstrate that the production of the siderophore petrobactin enables the acquisition of iron from mineral sources and weaker iron-ligand complexes. Notably, the utilization of lithogenic iron, such as that from atmospheric dust, indicates a significant role for siderophores in the incorporation of new iron into marine systems. We have also detected petrobactin, a photoreactive siderophore, directly from seawater in the mid-latitudes of the North Pacific and have identified the biosynthetic pathway for petrobactin in bacterial metagenome-assembled genomes widely distributed across the global ocean. Together, these results improve our mechanistic understanding of the role of siderophore production in iron biogeochemical cycling in the marine environment wherein iron speciation, bioavailability, and residence time can be directly influenced by microbial activities.

The Role of Experimental Forests and Ranges in the Development of Ecosystem Science and Biogeochemical Cycling Research

2014 ◽  
pp. 387-403 ◽  
Author(s):  
James M. Vose ◽  
Wayne T. Swank ◽  
Mary Beth Adams ◽  
Devendra Amatya ◽  
John Campbell ◽  
...  
Keyword(s):  
Biogeochemical Cycling ◽  
Ecosystem Science

scholarly journals Protective role of new nitrogen compounds on ROS/RNS-mediated damage to PC12 cells

2008 ◽  
Vol 42 (1) ◽  
pp. 57-69 ◽  
Author(s):  
João P. Silva ◽  
Fernanda Proença ◽  
Olga P. Coutinho
Keyword(s):  
Pc12 Cells ◽  
Protective Role ◽  
Nitrogen Compounds

scholarly journals A novel approach reveals high zooplankton standing stock deep in the sea

2016 ◽  
Author(s):  
Alexander Vereshchaka ◽  
Galina Abyzova ◽  
Anastasia Lunina ◽  
Eteri Musaeva ◽  
Tracey T. Sutton
Keyword(s):  
Standing Stock ◽  
World Ocean ◽  
Deep Ocean ◽  
Biogeochemical Cycling ◽  
Ocean Basin ◽  
Zooplankton Biomass ◽  
Ocean Dynamics ◽  
Novel Approach ◽  
Basin Scale

Abstract. In a changing ocean there is a critical need to understand global biogeochemical cycling, particularly regarding carbon. We have made strides in understanding upper ocean dynamics, but the deep ocean interior (> 1000 m) is still largely unknown, despite representing the overwhelming majority of Earth's biosphere. Here we present a method for estimating deep-pelagic zooplankton biomass on an ocean-basin scale. In so doing we have made several new discoveries about the Atlantic, which likely apply to the World Ocean. First, zooplankton biomass in the upper bathypelagic domain is higher than expected, representing an inverted biomass pyramid. Second, the majority of this biomass comprises macroplanktonic shrimps, which have been historically underestimated. These findings, coupled with recent findings of increased global deep-pelagic fish biomass, revise our perspective on the role of the deep-pelagic fauna in oceanic biogeochemical cycling.

Volatile components of cured and uncured pork: The role of nitrite and the formation of nitrogen compounds

1984 ◽  
Vol 35 (2) ◽  
pp. 233-239 ◽  
Author(s):  
Donald S. Mottram ◽  
Susan E. Croft ◽  
Ronald L. S. Patterson
Keyword(s):  
Volatile Components ◽  
Nitrogen Compounds

scholarly journals The role of nitrogen fixation in biogeochemical cycling in the subtropical North Pacific Ocean

Nature ◽  
10.1038/41474 ◽  
1997 ◽  
Vol 388 (6642) ◽  
pp. 533-538 ◽  
Author(s):  
D. Karl ◽  
R. Letelier ◽  
L. Tupas ◽  
J. Dore ◽  
J. Christian ◽  
...  
Keyword(s):  
Nitrogen Fixation ◽  
Pacific Ocean ◽  
North Pacific ◽  
North Pacific Ocean ◽  
Biogeochemical Cycling
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