Oxic-anoxic Interface
Oxic-anoxic Interface - Related Videos
11:43
Dissolved Solute Sampling Across an Oxic-Anoxic Soil-Water Interface Using Microdialysis Profilers
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Cited by 6 •
2023
A microdialysis profiler is described to sample dissolved porewater solutes across an oxic-anoxic soil-water interface in situ with minimal disturbance. This device is designed to capture rapid changes in concentration-depth profiles induced by disturbances at the soil-water interface and beyond.
02:04
Protein-protein Interfaces
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2020
Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a polypeptide...
09:21
Sediment Core Sectioning and Extraction of Pore Waters under Anoxic Conditions
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Cited by 5 •
2016
A protocol for sectioning sediment cores and extracting pore waters under anoxic conditions in order to permit analysis of redox sensitive species in both solids and fluids is presented.
06:17
Medium Preparation for the Cultivation of Microorganisms under Strictly Anaerobic/Anoxic Conditions
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Cited by 57 •
2019
As obligate anaerobic organisms are unable to grow upon oxygen exposure, the use of anaerobic culturing techniques is indispensable. Here, we demonstrate a simple and effective method to cultivate a mixed culture derived from a biogas plant from media preparation to gas and volatile fatty acid quantification.
16:38
Bridging the Bio-Electronic Interface with Biofabrication
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Cited by 3 •
2012
This article describes a biofabrication approach: deposition of stimuli-responsive polysaccharides in the presence of biased electrodes to create biocompatible films which can be functionalized with cells or proteins. We demonstrate a bench-top strategy for the generation of the films as well as their basic uses for creating interactive biofunctionalized surfaces for lab-on-a-chip applications.
FAQs
At the interface, oxygen availability determines whether organisms can rely on aerobic metabolism or whether anaerobic microbes use nitrate, sulfate, or carbon dioxide as alternative electron acceptors. These pathways operate across a sharply changing redox environment, so small spatial changes can separate metabolisms and place different organisms close together. The result is tightly coupled biological processing within a narrow zone.
Redox potential changes sharply across an oxic-anoxic interface and reflects the contrasting chemical conditions experienced by microorganisms. Together with oxygen concentration, this change helps distinguish regions where aerobic processes can occur from regions favoring anaerobic metabolisms. Because the transition is chemically steep, organisms with different metabolic requirements can occupy neighboring locations while contributing to linked ecosystem processes.
Chemical reactions at the boundary can produce steep gradients in pH and dissolved compounds. These gradients modify the local environment around microbial communities and accompany transformations of carbon, nitrogen, sulfur, and iron. Examining them helps connect visible chemical changes with the biological activity responsible for nutrient cycling, rather than treating oxygen concentration as the only important variable.
Aerobic organisms operate where oxygen is available, whereas anaerobic microbes use alternative electron acceptors, including nitrate, sulfate, or carbon dioxide, in oxygen-depleted areas. This contrast is important because the two metabolic modes support different biological processes and occupy different parts of the chemical gradient. Their close spatial arrangement allows nutrient transformations to remain connected across the boundary.
A useful investigation considers oxygen concentration, redox potential, pH, and dissolved compounds alongside the microbial processes occurring across the transition. These measurements and observations describe both the chemical gradient and its biological consequences. Linking the variables can reveal where aerobic and anaerobic activities occur and how their combined activity contributes to carbon, nitrogen, sulfur, and iron cycling.
Biologists examine these interfaces in sediments, lakes, oceans, and soils, where oxygen availability and chemical conditions change across short distances. The same principles also apply in engineered systems such as wastewater treatment facilities. Comparing these settings helps researchers understand how microbial metabolism responds to contrasting environments and how transition zones influence broader ecosystem function.
Study of the interface can show how microbial metabolism drives linked transformations of carbon, nitrogen, sulfur, and iron. It also clarifies how oxygen gradients, redox changes, pH shifts, and dissolved compounds organize biological activity. In natural and engineered environments, this information helps explain how a narrow transition zone contributes to nutrient cycling and overall system behavior.