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Factors Influencing Microbial Growth: Osmolarity01:28

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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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Factors Influencing Microbial Growth: Temperature01:27

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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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Factors Affecting Dissolution: Particle Size and Effective Surface Area01:23

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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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Environmental Applications of Microorganisms01:30

Environmental Applications of Microorganisms

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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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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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El factor microbiano en el comportamiento del hidrógeno subterráneo: implicaciones para la wettability y la dinámica

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
Resumen

La actividad microbiana altera la humedabilidad mineral subterránea, impactando el comportamiento del hidrógeno. Esta investigación muestra que los microbios aumentan la hidrofilicidad mineral, crucial para comprender el almacenamiento subterráneo de hidrógeno y los sistemas naturales de hidrógeno.

Palabras clave:
Interacciones microbianas y mineralesMinerologíaHidrógeno naturalComportamiento del hidrógeno bajo la superficieLas UHSPosibilidad de humedad

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Área de la Ciencia:

  • Geoquímica
  • Microbiología
  • Ingeniería del petróleo

Sus antecedentes:

  • La actividad microbiana influye significativamente en el comportamiento del hidrógeno subterráneo.
  • Comprender la humedabilidad mineral es fundamental para el almacenamiento de hidrógeno y la recuperación natural de hidrógeno.

Objetivo del estudio:

  • Investigar el impacto de los procesos microbianos en la humectabilidad de los minerales del subsuelo (calcita, dolomita, cuarzo, yeso).
  • Analizar cambios en las características de la interfaz sólido-líquido en sistemas de hidrógeno-salmuera-roca en condiciones subterráneas.

Principales métodos:

  • Experimentos realizados bajo condiciones de alta presión y temperatura.
  • Microscopía electrónica de barrido con espectroscopia de rayos X dispersiva de energía (SEM/EDS) para el análisis de la superficie mineral.
  • Comparación de muestras minerales limpias, envejecidas con ácido orgánico y envejecidas con microbios.

Principales resultados:

  • El envejecimiento microbiano aumentó constantemente la hidrofilidad mineral, reduciendo los ángulos de contacto avanzados (por ejemplo, calcita: 57 ° a 40 °).
  • Las biopelículas microbianas fueron más prominentes en la calcita y la dolomita, en correlación con la disminución del pH de la salmuera.
  • El cuarzo y el yeso mostraron cambios menos significativos en la humectabilidad.

Conclusiones:

  • Los procesos microbianos remodelan significativamente las propiedades superficiales de los minerales y la humedecibilidad en los entornos subterráneos.
  • Estos hallazgos proporcionan información crítica sobre las interacciones microbiano-minerales para optimizar el almacenamiento de hidrógeno y la recuperación natural de hidrógeno.