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Factors Influencing Microbial Growth: Osmolarity01:28

Factors Influencing Microbial Growth: Osmolarity

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Osmolarity is the measure of solute concentration in a solution. It plays a critical role in determining water availability for organisms. Water moves across semipermeable membranes through osmosis, flowing from regions of lower solute concentration (more dilute) to regions of higher solute concentration (more concentrated).In high-solute environments, microbial cells lose water, leading to dehydration and inhibited growth. The extent to which water is available to microbes in such environments...
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Microorganisms display remarkable adaptations, enabling them to thrive in diverse ecological niches across a wide range of temperatures. Temperature profoundly influences microbial growth by affecting enzymatic activity, membrane fluidity, and other cellular processes.Each microorganism operates within a specific temperature range defined by three cardinal points: minimum, optimum, and maximum. Below the minimum temperature, membranes lose fluidity, halting transport processes. Above the...
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The process of surrounding a solute with solvent is called solvation. It involves evenly distributing the solute within the solvent. The rule of thumb for determining a solvent for a given compound is that like dissolves like. A good solvent has molecular characteristics similar to those of the compound to be dissolved. For example, polar solutions dissolve polar solutes, and apolar solvents dissolve apolar solutes. A polar solvent is a solvent that has a high dielectric constant (ϵ...
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Dissolution kinetics, an essential aspect of oral drug delivery, is significantly influenced by the drug's particle size. According to the Noyes-Whitney dissolution model, the dissolution rate correlates directly with the drug's surface area. The larger the surface area, the higher the drug's solubility in water, leading to a faster drug dissolution rate. Reducing particle size increases the effective surface area, enhancing the dissolution process. Micronization and nanosizing are...
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Microorganisms play a pivotal role in maintaining ecosystem balance by recycling essential elements such as carbon, nitrogen, and phosphorus, as well as supporting processes like bioremediation, wastewater treatment, and biofuel production.Microbes in Elemental CyclesIn the carbon cycle, microorganisms decompose organic matter, releasing carbon dioxide via aerobic respiration. This carbon dioxide is subsequently used by photosynthetic organisms to synthesize organic compounds, closing the...
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Related Experiment Video

Updated: Sep 9, 2025

Quantification of Hydrogen Concentrations in Surface and Interface Layers and Bulk Materials through Depth Profiling with Nuclear Reaction Analysis
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The Microbial Factor in Subsurface Hydrogen Behavior: Implications for Wettability and Interfacial Dynamics.

Hamid Esfandyari1, Raziallah Jafari Jozani2, Aliakbar Hassanpouryouzband3

  • 1School of Chemical Engineering, Discipline of Mining and Petroleum Engineering, The University of Adelaide, Adelaide, SA 5005, Australia.

Advances in Colloid and Interface Science
|September 1, 2025
PubMed
Summary

Microbial activity alters subsurface mineral wettability, impacting hydrogen behavior. This research shows microbes increase mineral hydrophilicity, crucial for understanding underground hydrogen storage and natural hydrogen systems.

Keywords:
Microbial–mineral interactionsMineralogyNatural hydrogenSubsurface hydrogen behaviorUHSWettability

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Using Flexible Gold-Titanium Reaction Cells to Simulate Pressure-Dependent Microbial Activity in the Context of Subsurface Biomining
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Area of Science:

  • Geochemistry
  • Microbiology
  • Petroleum Engineering

Background:

  • Microbial activity significantly influences subsurface hydrogen behavior.
  • Understanding mineral wettability is critical for hydrogen storage and natural hydrogen recovery.

Purpose of the Study:

  • To investigate the impact of microbial processes on the wettability of subsurface minerals (calcite, dolomite, quartz, gypsum).
  • To analyze changes in solid-liquid interfacial characteristics in hydrogen-brine-rock systems under subsurface conditions.

Main Methods:

  • Experiments conducted under high-pressure, high-temperature conditions.
  • Scanning Electron Microscopy with Energy Dispersive X-ray Spectroscopy (SEM/EDS) for mineral surface analysis.
  • Comparison of clean, organic acid-aged, and microbial-aged mineral samples.

Main Results:

  • Microbial aging consistently increased mineral hydrophilicity, reducing advancing contact angles (e.g., calcite: 57° to 40°).
  • Microbial biofilms were most prominent on calcite and dolomite, correlating with decreased brine pH.
  • Quartz and gypsum showed less significant changes in wettability.

Conclusions:

  • Microbial processes significantly reshape mineral surface properties and wettability in subsurface environments.
  • These findings provide critical insights into microbial-mineral interactions for optimizing hydrogen storage and natural hydrogen recovery.