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Related Concept Videos

Arrhenius Plots02:34

Arrhenius Plots

The Arrhenius equation relates the activation energy and the rate constant, k, for chemical reactions. In the Arrhenius equation, k = Ae−Ea/RT, R is the ideal gas constant, which has a value of 8.314 J/mol·K, T is the temperature on the kelvin scale, Ea is the activation energy in J/mole, e is the constant 2.7183, and A is a constant called the frequency factor, which is related to the frequency of collisions and the orientation of the reacting molecules.
The Arrhenius equation can be used to...

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High-throughput Fluorometric Measurement of Potential Soil Extracellular Enzyme Activities
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Arrhenius parameter determination as a function of heating method and cellular microenvironment based on spatial cell

Jon Whitney1, William Carswell, Nichole Rylander

  • 1Department of Mechanical Engineering, Virginia Tech, Stanger Street, Blacksburg, VA 24061, USA. jonwhit@vt.edu

International Journal of Hyperthermia : the Official Journal of European Society for Hyperthermic Oncology, North American Hyperthermia Group
|June 7, 2013
PubMed
Summary

Heating method and cellular environment significantly alter Arrhenius parameters used for photothermal therapy predictions. Laser heating of tissue phantoms provided the most accurate injury predictions, highlighting the need for physiologically relevant models.

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Area of Science:

  • Biophysics
  • Biomedical Engineering
  • Photothermal Therapy

Background:

  • Arrhenius parameters are crucial for predicting cell death during photothermal therapy.
  • Current methods often rely on simplified models (cell monolayers, water bath heating).
  • The influence of heating method and microenvironment on these predictions is not fully understood.

Purpose of the Study:

  • To investigate how heating method (water bath vs. laser irradiation) and cellular microenvironment (monolayers vs. tissue phantoms) affect Arrhenius parameters.
  • To assess the accuracy of Arrhenius parameters derived from simplified conditions in predicting outcomes in more complex, physiologically relevant systems.

Main Methods:

  • MDA-MB-231 cells and sodium alginate phantoms were subjected to water bath heating or laser irradiation with carbon nanohorns.
  • Spatial viability was quantified using live/dead cell staining (calcein AM, propidium iodide) and digital image analysis.
  • Arrhenius parameters were determined, and their predictive capability for different heating/microenvironment combinations was evaluated.

Main Results:

  • Arrhenius parameters derived from water bath heating of monolayers significantly under-predicted injury areas in laser-treated phantoms (23-27 mm² error).
  • Parameters from laser-treated phantoms showed minimal under-prediction (0.7 mm² error) when predicting laser-treated phantoms.
  • Heating method had a greater impact on Arrhenius parameters than the cellular microenvironment.

Conclusions:

  • Both heating method and microenvironment critically influence Arrhenius parameters for photothermal therapy.
  • Laser irradiation combined with tissue phantoms yields the most accurate parameters for predicting in vivo injury.
  • Simplified models are insufficient for accurate prediction; more complex, physiologically relevant models are necessary.