scholarly journals Tc(VII) and Cr(VI) Interaction with Naturally Reduced Ferruginous Smectite from a Redox Transition Zone

2017 ◽  
Vol 51 (16) ◽  
pp. 9042-9052 ◽  
Author(s):  
Odeta Qafoku ◽  
Carolyn I. Pearce ◽  
Anke Neumann ◽  
Libor Kovarik ◽  
Mengqiang Zhu ◽  
...  
Keyword(s):  
Transition Zone ◽  
Redox Transition ◽  
Ferruginous Smectite

scholarly journals Microbial mineral colonization across a subsurface redox transition zone

2015 ◽  
Vol 6 ◽  
Author(s):  
Brandon J. Converse ◽  
James P. McKinley ◽  
Charles T. Resch ◽  
Eric E. Roden
Keyword(s):  
Transition Zone ◽  
Redox Transition

Chemoautotrophy in the redox transition zone of the Cariaco Basin: A significant midwater source of organic carbon production

2001 ◽  
Vol 46 (1) ◽  
pp. 148-163 ◽  
Author(s):  
Gordon T. Taylor ◽  
Maria Iabichella ◽  
Tung-Yuan Ho ◽  
Mary I. Scranton ◽  
Robert C. Thunell ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Transition Zone ◽  
Cariaco Basin ◽  
Redox Transition ◽  
Carbon Production

scholarly journals Fe-phyllosilicate redox cycling organisms from a redox transition zone in Hanford 300 Area sediments

2013 ◽  
Vol 4 ◽  
Author(s):  
Jason Benzine ◽  
Evgenya Shelobolina ◽  
Mai Yia Xiong ◽  
David W. Kennedy ◽  
James P. McKinley ◽  
...  
Keyword(s):  
Transition Zone ◽  
Redox Cycling ◽  
Redox Transition

scholarly journals Divergence in Gene Regulation Contributes to Sympatric Speciation of Shewanella baltica Strains

2017 ◽  
Vol 84 (4) ◽  
Author(s):  
Jie Deng ◽  
Jennifer M. Auchtung ◽  
Konstantinos T. Konstantinidis ◽  
Alejandro Caro-Quintero ◽  
Ingrid Brettar ◽  
...  
Keyword(s):  
Transition Zone ◽  
Sequence Divergence ◽  
Positive Association ◽  
Sulfur Compounds ◽  
Comparative Genomic ◽  
Sequence Evolution ◽  
Transcriptional Responses ◽  
Content Type ◽  
Redox Transition ◽  
Shewanella Baltica

ABSTRACT Niche partitioning and sequence evolution drive genomic and phenotypic divergence, which ultimately leads to bacterial diversification. This study investigated the genomic composition of two Shewanella baltica clades previously identified through multilocus sequencing typing and recovered from the redox transition zone in the central Baltic Sea. Comparative genomic analysis revealed significantly higher interclade than intraclade genomic dissimilarity and that a subset of genes present in clade A were associated with potential adaptation to respiration of sulfur compounds present in the redox transition zone. The transcriptomic divergence between two representative strains of clades A and D, OS185 and OS195, was also characterized and revealed marked regulatory differences. We found that both the transcriptional divergence of shared genes and expression of strain-specific genes led to differences in regulatory patterns between strains that correlate with environmental redox niches. For instance, under anoxic conditions of respiratory nitrate ammonification, OS185—the strain isolated from a nitrate-rich environment—upregulated nearly twice the number of shared genes upregulated by OS195—the strain isolated from an H 2 S-containing anoxic environment. Conversely, OS195 showed stronger induction of strain-specific genes, especially those associated with sulfur compound respiration, under thiosulfate-reducing conditions. A positive association between the level of transcriptional divergence and the level of sequence divergence for shared genes was also noted. Our results provide further support for the hypothesis that genomic changes impacting transcriptional regulation play an important role in the diversification of ecologically distinct populations. IMPORTANCE This study examined potential mechanisms through which co-occurring Shewanella baltica strains diversified to form ecologically distinct populations. At the time of isolation, the strains studied composed the major fraction of culturable nitrate-reducing communities in the Baltica Sea. Analysis of genomic content of 13 S. baltica strains from two clades representing different ecotypes demonstrated that one clade specifically possesses a number of genes that could favor successful adaptation to respire sulfur compounds in the portion of the water column from which these strains were isolated. In addition, transcriptional profiling of fully sequenced strains representative of these two clades, OS185 and OS195, under oxygen-, nitrate-, and thiosulfate-respiring conditions demonstrated that the strains exhibit relatively similar transcriptional responses during aerobic growth but more-distinct transcriptional responses under nitrate- and thiosulfate-respiring conditions. Results from this study provide insights into how genomic and gene regulatory diversification together impacted the redox specialization of the S. baltica strains.

Pertechnetate (TcO4−) reduction by reactive ferrous iron forms in naturally anoxic, redox transition zone sediments from the Hanford Site, USA

2012 ◽  
Vol 92 ◽  
pp. 48-66 ◽  
Author(s):  
T.S. Peretyazhko ◽  
J.M. Zachara ◽  
R.K. Kukkadapu ◽  
S.M. Heald ◽  
I.V. Kutnyakov ◽  
...  
Keyword(s):  
Transition Zone ◽  
Ferrous Iron ◽  
Hanford Site ◽  
Redox Transition ◽  
Iron Forms

Stability, genotypic and phenotypic diversity ofShewanella balticain the redox transition zone of the Baltic Sea

2014 ◽  
Vol 16 (6) ◽  
pp. 1854-1866 ◽  
Author(s):  
Jie Deng ◽  
Ingrid Brettar ◽  
Chengwei Luo ◽  
Jennifer Auchtung ◽  
Konstantinos T. Konstantinidis ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Transition Zone ◽  
Phenotypic Diversity ◽  
The Baltic Sea ◽  
Redox Transition ◽  
The Baltic

Modelling nitrogen and oxygen isotope fractionation during denitrification in a lacustrine redox-transition zone

2003 ◽  
Vol 67 (14) ◽  
pp. 2529-2542 ◽  
Author(s):  
Moritz F. Lehmann ◽  
Peter Reichert ◽  
Stefano M. Bernasconi ◽  
Alberto Barbieri ◽  
Judith A. McKenzie
Keyword(s):  
Oxygen Isotope ◽  
Transition Zone ◽  
Isotope Fractionation ◽  
Oxygen Isotope Fractionation ◽  
Redox Transition

210Pb and stable lead through the redox transition zone of an Antarctic lake

1995 ◽  
Vol 59 (12) ◽  
pp. 2459-2468 ◽  
Author(s):  
Donald E. Canfield ◽  
William J. Green ◽  
Philip Nixon
Keyword(s):  
Transition Zone ◽  
Antarctic Lake ◽  
Redox Transition

Uranium biogeochemistry across the redox transition zone of a permanently stratified fjord: Framvaren, Norway

1999 ◽  
Vol 67 (3-4) ◽  
pp. 181-198 ◽  
Author(s):  
P.W. Swarzenski ◽  
B.A. McKee ◽  
J.M. Skei ◽  
J.F. Todd
Keyword(s):  
Transition Zone ◽  
Redox Transition
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