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Related Concept Videos

Colloidal precipitates01:09

Colloidal precipitates

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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Studying Cryptosporidium Infection in 3D Tissue-derived Human Organoid Culture Systems by Microinjection
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Silver Nanoparticles Decrease the Viability of Cryptosporidium parvum Oocysts.

Pamela Cameron1, Birgit K Gaiser2, Bidha Bhandari3

  • 1Moredun Research Institute, Penicuik, United Kingdom Novo Science Ltd., Edinburgh, United Kingdom pam@novoscience.co.uk.

Applied and Environmental Microbiology
|October 27, 2015
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Summary
This summary is machine-generated.

Silver nanoparticles (AgNPs) and silver ions effectively reduce Cryptosporidium parvum oocyst viability. AgNPs demonstrated greater efficacy in decreasing oocyst viability and damaging sporozoites compared to silver ions.

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Area of Science:

  • Environmental science
  • Microbiology
  • Nanotechnology

Background:

  • Cryptosporidium parvum oocysts are a significant waterborne pathogen.
  • Oocysts exhibit high resistance to conventional disinfectants like chlorine.

Purpose of the Study:

  • To investigate the efficacy of silver nanoparticles (AgNPs) and silver ions in inactivating Cryptosporidium parvum oocysts.
  • To compare the mechanisms of action between AgNPs and silver ions against oocysts.

Main Methods:

  • Oocyst viability assessed using excystation assays.
  • Shell/sporozoite ratio determined to evaluate oocyst integrity.
  • Hyperspectral imaging used to visualize nanoparticle-oocyst interactions.

Main Results:

  • Both AgNPs and silver ions reduced oocyst viability in a dose-dependent manner.
  • AgNPs significantly decreased excystation rates (83% to 33%) at 500 μg/ml.
  • AgNPs showed a greater impact on the sporozoite/shell ratio, indicating more extensive damage.

Conclusions:

  • AgNPs and silver ions are promising agents for Cryptosporidium parvum disinfection.
  • AgNPs exhibit superior efficacy, likely due to direct interaction with the oocyst wall and internal sporozoites.
  • Understanding these interactions can inform novel water treatment strategies.