Antibiotic Binding and Dynamics within the OmpF Channel Allow Transfer Across the Bacterial Outer Membrane

Ziervogel, Brigitte; Dhaksnamoorthy, Balasundaresan; Blachowicz, Lydia; Roux, Benoı̂t

doi:10.1016/j.bpj.2010.12.1550

Cited by 2 publications

(1 citation statement)

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“…2). About 10 % of marine DOC exists in the form of gels which harbor heterotrophic prokaryotes (Azam and Malfatti, 2007) and can accelerate carbon transformation (Ziervogel et al, 2011), while POC or aggregates attract copiotrophs such as Bacteroides (Arnosti et al, 2012) that have motility and chemotaxis genes and can potentially follow DOC gradients (Stocker, 2012). Many marine heterotrophic prokaryotes produce polysaccharides, which help them attach to biotic and abiotic surfaces to form aggregates.…”

Section: Interactions Between Poc and Doc Sequestrationmentioning

confidence: 99%

Mechanisms of microbial carbon sequestration in the ocean – future research directions

Jiao

Robinson²,

Azam³

et al. 2014

Biogeosciences

192

101

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Abstract. This paper reviews progress on understanding biological carbon sequestration in the ocean with special reference to the microbial formation and transformation of recalcitrant dissolved organic carbon (RDOC), the microbial carbon pump (MCP). We propose that RDOC is a concept with a wide continuum of recalcitrance. Most RDOC compounds maintain their levels of recalcitrance only in a specific environmental context (RDOC t ). The ocean RDOC pool also contains compounds that may be inaccessible to microbes due to their extremely low concentration (RDOC c ). This differentiation allows us to appreciate the linkage between microbial source and RDOC composition on a range of temporal and spatial scales.Analyses of biomarkers and isotopic records show intensive MCP processes in the Proterozoic oceans when the MCP could have played a significant role in regulating climate. Understanding the dynamics of the MCP in conjunction with the better constrained biological pump (BP) over geological timescales could help to predict future climate trends. Integration of the MCP and the BP will require new research approaches and opportunities. Major goals include understanding the interactions between particulate organic carbon (POC) and RDOC that contribute to sequestration efficiency, and the concurrent determination of the chemical composition of organic carbon, microbial community composition and enzymatic activity. Molecular biomarkers and isotopic tracers should be employed to link water column processes Published by Copernicus Publications on behalf of the European Geosciences Union. N. Jiao et al.: Mechanisms of microbial carbon sequestration in the oceanto sediment records, as well as to link present-day observations to paleo-evolution. Ecosystem models need to be developed based on empirical relationships derived from bioassay experiments and field investigations in order to predict the dynamics of carbon cycling along the stability continuum of POC and RDOC under potential global change scenarios. We propose that inorganic nutrient input to coastal waters may reduce the capacity for carbon sequestration as RDOC. The nutrient regime enabling maximum carbon storage from combined POC flux and RDOC formation should therefore be sought.

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Section: Interactions Between Poc and Doc Sequestrationmentioning

confidence: 99%

Mechanisms of microbial carbon sequestration in the ocean – future research directions

Jiao

Robinson²,

Azam³

et al. 2014

Biogeosciences

192

101

View full text Add to dashboard Cite

show abstract

Mechanisms of microbial carbon sequestration in the ocean – future research directions

Jiao¹,

Robinson²,

Azam³

et al. 2014

Preprint

View full text Add to dashboard Cite

Abstract. This paper reviews progress on understanding biological carbon sequestration in the ocean with special reference to the microbial formation and transformation of recalcitrant dissolved organic carbon (RDOC), the microbial carbon pump (MCP). We propose that RDOC is a relative concept with a wide continuum of recalcitrance. Most RDOC compounds maintain their levels of recalcitrance only in a specific environmental context (RDOCt). The ocean RDOC pool also contains compounds that may be inaccessible to microbes due to their extremely low concentration (RDOCc). This differentiation allows us to appreciate the linkage between microbial source and RDOC composition on a range of temporal and spatial scales. Analyses of biomarkers and isotopic records show intensive MCP processes in the anoxic Proterozoic oceans when the MCP could have played a significant role in regulating climate. Understanding the dynamics of the MCP in conjunction with the better constrained biological pump (BP) over geological timescales could help to predict future climate trends. Integration of the MCP and the BP will require new research approaches and opportunities. Major goals include understanding the interactions between particulate organic carbon (POC) and RDOC that contribute to sequestration efficiency, and the concurrent determination of the chemical composition of organic carbon, microbial community composition and enzymatic activity. Molecular biomarkers and isotopic tracers should be employed to link water column processes to sediment records, as well as to link present-day observations to paleo-evolution. Ecosystem models need to be developed based on empirical relationships derived from bioassay experiments and field investigations in order to predict the dynamics of carbon cycling along the stability continuum of POC and RDOC under potential global change scenarios. We propose that inorganic nutrient input to coastal waters may reduce the capacity for carbon sequestration as RDOC. The nutrient regime enabling maximum carbon storage from combined POC flux and RDOC formation should therefore be sought.

show abstract

Antibiotic Binding and Dynamics within the OmpF Channel Allow Transfer Across the Bacterial Outer Membrane

Cited by 2 publications

References 0 publications

Mechanisms of microbial carbon sequestration in the ocean – future research directions

Mechanisms of microbial carbon sequestration in the ocean – future research directions

Mechanisms of microbial carbon sequestration in the ocean – future research directions

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