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Determining the optimal dose size and dosing frequency in pharmacotherapy is crucial for achieving therapeutic effectiveness while minimizing adverse effects. This article explores the methodologies employed in determining these parameters, focusing on their significance and interplay to tailor dosing regimens.Dose Size: Dose size refers to the amount of a drug administered in a single dose. It is determined based on the drug's pharmacodynamics and pharmacokinetics properties and...
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Gaining a Critical Mass: A Dose Metric Conversion Case Study Using Silver Nanoparticles.

Alan J Kennedy1, Matthew S Hull2,3, Stephen Diamond3

  • 1U.S. Army Engineer Research and Development Center , Environmental Laboratory, Vicksburg, Mississippi 39180, United States.

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Summary
This summary is machine-generated.

The best way to measure silver nanoparticle toxicity is by ion release, which relates to total surface area. Particle number is not a reliable indicator of nanoparticle effects.

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Area of Science:

  • Environmental toxicology
  • Nanotoxicology
  • Ecotoxicology

Background:

  • Traditional ecotoxicology uses mass concentration for dissolved substances.
  • Nanotoxicology questions the suitability of mass concentration for nanoparticles.
  • Alternative metrics include particle number, surface area, and ion release.

Purpose of the Study:

  • To determine the most suitable dose metric for silver nanoparticle toxicity.
  • To compare particle number, surface area, and ion release as toxicity indicators.
  • To generate acute toxicity data for silver nanoparticles.

Main Methods:

  • Exposed two species (Ceriodaphnia dubia, Pimephales promelas) to five sizes of silver nanoparticles.
  • Used various techniques to measure particle size, number, surface area, and dissolved fraction.
  • Generated acute toxicity data.

Main Results:

  • Acute toxicity of silver nanoparticles is best expressed by ion release.
  • Toxicity is relatable to the total exposed surface area of the nanoparticles.
  • Particle number did not correlate with observed acute toxicity effects.

Conclusions:

  • Ion release is a key factor in silver nanoparticle toxicity.
  • Total surface area provides a relevant measure for nanoparticle toxicity.
  • Particle number is not a suitable metric for assessing acute silver nanoparticle toxicity.