Nanomedicine and nanoparticles

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Nanoparticle: a very tiny object, often thought of as a small piece of matter measured on the nano-scale (between 1 and 100 billionths of a meter long).

Protein: a type of molecule found in the cells of living things, made up of special building blocks called amino acids.

X-ray: a photograph taken of the inside of the body using a special type of light... more

Nanoparticle Highlighters

Femoral screwsIf you look at an x-ray of a human body, what do you see? Bones, of course, and the faint outlines of some organs. Maybe there’s something metal in the body like a fake hip or screws that also shows up. But what if you wanted to look at the lungs, or see where cancer is in the body? Many whole body imaging methods like x-rays have a problem finding some things. One way scientists are getting around this problem is by packing nanoparticles with molecules that are easily seen in each kind of image. 

Bright Spots are the Right Spots

X-ray images are made when x-rays pass through a person or thing and hit a white film on the other side. The places on the film that are hit with x-rays turn dark. Bones and metal are dense enough to block x-rays, so they will cast a white “shadow” on the film.

Since nanoparticles can be made out of metal, they will also make white spots on the x-ray film if there are enough of them in one spot. Nanoparticles can be sent to specific parts of the body, like tumors or less dense tissues, to make them show up bright white on an x-ray image.

Glowing Body Parts

GloFishIf you’ve been to a pet store recently, maybe you’ve seen fish there that glow when they’re under a black light. They glow because they make proteins that absorb the black light and release a different colored light.

These proteins can be made and added to nanoparticles, which are then sent to a specific part of the body to make it glow. This can be very useful for surgeons working on removing tumors or repairing organs. They can tell tissues apart much more easily when what they’re trying to find is glowing. 

Additional images via Wikimedia Commons. Jellyfish by Dan 90266.

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Bibliographic details:

  • Article: Nanoparticle Highlighters
  • Author(s): Megan Turnidge
  • Publisher: Arizona State University School of Life Sciences Ask A Biologist
  • Site name: ASU - Ask A Biologist
  • Date published: November 25, 2015
  • Date accessed: September 26, 2020
  • Link:

APA Style

Megan Turnidge. (2015, November 25). Nanoparticle Highlighters. ASU - Ask A Biologist. Retrieved September 26, 2020 from

American Psychological Association. For more info, see

Chicago Manual of Style

Megan Turnidge. "Nanoparticle Highlighters". ASU - Ask A Biologist. 25 November, 2015.

MLA 2017 Style

Megan Turnidge. "Nanoparticle Highlighters". ASU - Ask A Biologist. 25 Nov 2015. ASU - Ask A Biologist, Web. 26 Sep 2020.

Modern Language Association, 7th Ed. For more info, see
The proteins that are used to make fish and nanoparticles glow were first found in a species of jellyfish. Scientists can now use jellyfish DNA to make many different plants and animals glow.

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