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Paper   IPM / Nano-Sciences / 15517
School of Nano Science
  Title:   Nanoparticles affect bacterial colonies' optical diffraction patterns
1.  Pezhman Sasanpour
2.  Arezou Dilmaghani Marand
3.  Hojatollah Montazeri
4.  Saeed Ivani
5.  Mohammad Javad Hajipour
6.  Morteza Mahmoudi
  Status:   Published
  Journal: Nanoscale
  Vol.:  11
  Year:  2019
  Pages:   2594
  Publisher(s):   The Royal Society of Chemistry
  Supported by:  IPM
It is increasingly being accepted that bacteria are able to alter their shape/colony pattern in response to adverse environmental conditions. Morphological adaptation of bacteria is known as one of their defence mechanisms against environmental stress/variations. As nanoparticles (NPs) have a unique capacity to induce a wide range of stresses to bacteria, we hypothesized that such NPs can affect the bacterial colony pattern. To test this hypothesis, we incubated a series of superparamagnetic iron oxide nanoparticles (SPIONs) with different physicochemical properties with bacterial colonies and probed the colonies' diffraction patterns by laser. The diffraction patterns of Escherichia coli, Lactobacillus rhamnosus, and Staphylococcus aureus colonies were recorded using a laser. Our results revealed the formation of distinct bacterial diffraction patterns in response to SPIONs with various concentrations and surface chemistries. Our results may pave the way toward the development of new optical approaches for the high-throughput screening of bacterial-NPs/drugs interactions.

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